1*fa9e4066Sahrens /* 2*fa9e4066Sahrens * CDDL HEADER START 3*fa9e4066Sahrens * 4*fa9e4066Sahrens * The contents of this file are subject to the terms of the 5*fa9e4066Sahrens * Common Development and Distribution License, Version 1.0 only 6*fa9e4066Sahrens * (the "License"). You may not use this file except in compliance 7*fa9e4066Sahrens * with the License. 8*fa9e4066Sahrens * 9*fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 11*fa9e4066Sahrens * See the License for the specific language governing permissions 12*fa9e4066Sahrens * and limitations under the License. 13*fa9e4066Sahrens * 14*fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 15*fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 17*fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 18*fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 19*fa9e4066Sahrens * 20*fa9e4066Sahrens * CDDL HEADER END 21*fa9e4066Sahrens */ 22*fa9e4066Sahrens /* 23*fa9e4066Sahrens * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24*fa9e4066Sahrens * Use is subject to license terms. 25*fa9e4066Sahrens */ 26*fa9e4066Sahrens 27*fa9e4066Sahrens #pragma ident "%Z%%M% %I% %E% SMI" 28*fa9e4066Sahrens 29*fa9e4066Sahrens #include <sys/types.h> 30*fa9e4066Sahrens #include <sys/param.h> 31*fa9e4066Sahrens #include <sys/time.h> 32*fa9e4066Sahrens #include <sys/systm.h> 33*fa9e4066Sahrens #include <sys/sysmacros.h> 34*fa9e4066Sahrens #include <sys/resource.h> 35*fa9e4066Sahrens #include <sys/vfs.h> 36*fa9e4066Sahrens #include <sys/vnode.h> 37*fa9e4066Sahrens #include <sys/file.h> 38*fa9e4066Sahrens #include <sys/stat.h> 39*fa9e4066Sahrens #include <sys/kmem.h> 40*fa9e4066Sahrens #include <sys/taskq.h> 41*fa9e4066Sahrens #include <sys/uio.h> 42*fa9e4066Sahrens #include <sys/vmsystm.h> 43*fa9e4066Sahrens #include <sys/atomic.h> 44*fa9e4066Sahrens #include <vm/seg_vn.h> 45*fa9e4066Sahrens #include <vm/pvn.h> 46*fa9e4066Sahrens #include <vm/as.h> 47*fa9e4066Sahrens #include <sys/mman.h> 48*fa9e4066Sahrens #include <sys/pathname.h> 49*fa9e4066Sahrens #include <sys/cmn_err.h> 50*fa9e4066Sahrens #include <sys/errno.h> 51*fa9e4066Sahrens #include <sys/unistd.h> 52*fa9e4066Sahrens #include <sys/zfs_vfsops.h> 53*fa9e4066Sahrens #include <sys/zfs_dir.h> 54*fa9e4066Sahrens #include <sys/zfs_acl.h> 55*fa9e4066Sahrens #include <sys/zfs_ioctl.h> 56*fa9e4066Sahrens #include <sys/fs/zfs.h> 57*fa9e4066Sahrens #include <sys/dmu.h> 58*fa9e4066Sahrens #include <sys/spa.h> 59*fa9e4066Sahrens #include <sys/txg.h> 60*fa9e4066Sahrens #include <sys/refcount.h> /* temporary for debugging purposes */ 61*fa9e4066Sahrens #include <sys/dbuf.h> 62*fa9e4066Sahrens #include <sys/zap.h> 63*fa9e4066Sahrens #include <sys/dirent.h> 64*fa9e4066Sahrens #include <sys/policy.h> 65*fa9e4066Sahrens #include <sys/sunddi.h> 66*fa9e4066Sahrens #include <sys/filio.h> 67*fa9e4066Sahrens #include "fs/fs_subr.h" 68*fa9e4066Sahrens #include <sys/zfs_ctldir.h> 69*fa9e4066Sahrens 70*fa9e4066Sahrens /* 71*fa9e4066Sahrens * Programming rules. 72*fa9e4066Sahrens * 73*fa9e4066Sahrens * Each vnode op performs some logical unit of work. To do this, the ZPL must 74*fa9e4066Sahrens * properly lock its in-core state, create a DMU transaction, do the work, 75*fa9e4066Sahrens * record this work in the intent log (ZIL), commit the DMU transaction, 76*fa9e4066Sahrens * and wait the the intent log to commit if it's is a synchronous operation. 77*fa9e4066Sahrens * Morover, the vnode ops must work in both normal and log replay context. 78*fa9e4066Sahrens * The ordering of events is important to avoid deadlocks and references 79*fa9e4066Sahrens * to freed memory. The example below illustrates the following Big Rules: 80*fa9e4066Sahrens * 81*fa9e4066Sahrens * (1) A check must be made in each zfs thread for a mounted file system. 82*fa9e4066Sahrens * This is done avoiding races using ZFS_ENTER(zfsvfs). 83*fa9e4066Sahrens * A ZFS_EXIT(zfsvfs) is needed before all returns. 84*fa9e4066Sahrens * 85*fa9e4066Sahrens * (2) VN_RELE() should always be the last thing except for zil_commit() 86*fa9e4066Sahrens * and ZFS_EXIT(). This is for 3 reasons: 87*fa9e4066Sahrens * First, if it's the last reference, the vnode/znode 88*fa9e4066Sahrens * can be freed, so the zp may point to freed memory. Second, the last 89*fa9e4066Sahrens * reference will call zfs_zinactive(), which may induce a lot of work -- 90*fa9e4066Sahrens * pushing cached pages (which requires z_grow_lock) and syncing out 91*fa9e4066Sahrens * cached atime changes. Third, zfs_zinactive() may require a new tx, 92*fa9e4066Sahrens * which could deadlock the system if you were already holding one. 93*fa9e4066Sahrens * 94*fa9e4066Sahrens * (3) Always pass zfsvfs->z_assign as the second argument to dmu_tx_assign(). 95*fa9e4066Sahrens * In normal operation, this will be TXG_NOWAIT. During ZIL replay, 96*fa9e4066Sahrens * it will be a specific txg. Either way, dmu_tx_assign() never blocks. 97*fa9e4066Sahrens * This is critical because we don't want to block while holding locks. 98*fa9e4066Sahrens * Note, in particular, that if a lock is sometimes acquired before 99*fa9e4066Sahrens * the tx assigns, and sometimes after (e.g. z_lock), then failing to 100*fa9e4066Sahrens * use a non-blocking assign can deadlock the system. The scenario: 101*fa9e4066Sahrens * 102*fa9e4066Sahrens * Thread A has grabbed a lock before calling dmu_tx_assign(). 103*fa9e4066Sahrens * Thread B is in an already-assigned tx, and blocks for this lock. 104*fa9e4066Sahrens * Thread A calls dmu_tx_assign(TXG_WAIT) and blocks in txg_wait_open() 105*fa9e4066Sahrens * forever, because the previous txg can't quiesce until B's tx commits. 106*fa9e4066Sahrens * 107*fa9e4066Sahrens * If dmu_tx_assign() returns ERESTART and zfsvfs->z_assign is TXG_NOWAIT, 108*fa9e4066Sahrens * then drop all locks, call txg_wait_open(), and try again. 109*fa9e4066Sahrens * 110*fa9e4066Sahrens * (4) If the operation succeeded, generate the intent log entry for it 111*fa9e4066Sahrens * before dropping locks. This ensures that the ordering of events 112*fa9e4066Sahrens * in the intent log matches the order in which they actually occurred. 113*fa9e4066Sahrens * 114*fa9e4066Sahrens * (5) At the end of each vnode op, the DMU tx must always commit, 115*fa9e4066Sahrens * regardless of whether there were any errors. 116*fa9e4066Sahrens * 117*fa9e4066Sahrens * (6) After dropping all locks, invoke zil_commit(zilog, seq, ioflag) 118*fa9e4066Sahrens * to ensure that synchronous semantics are provided when necessary. 119*fa9e4066Sahrens * 120*fa9e4066Sahrens * In general, this is how things should be ordered in each vnode op: 121*fa9e4066Sahrens * 122*fa9e4066Sahrens * ZFS_ENTER(zfsvfs); // exit if unmounted 123*fa9e4066Sahrens * top: 124*fa9e4066Sahrens * zfs_dirent_lock(&dl, ...) // lock directory entry (may VN_HOLD()) 125*fa9e4066Sahrens * rw_enter(...); // grab any other locks you need 126*fa9e4066Sahrens * tx = dmu_tx_create(...); // get DMU tx 127*fa9e4066Sahrens * dmu_tx_hold_*(); // hold each object you might modify 128*fa9e4066Sahrens * error = dmu_tx_assign(tx, zfsvfs->z_assign); // try to assign 129*fa9e4066Sahrens * if (error) { 130*fa9e4066Sahrens * dmu_tx_abort(tx); // abort DMU tx 131*fa9e4066Sahrens * rw_exit(...); // drop locks 132*fa9e4066Sahrens * zfs_dirent_unlock(dl); // unlock directory entry 133*fa9e4066Sahrens * VN_RELE(...); // release held vnodes 134*fa9e4066Sahrens * if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { 135*fa9e4066Sahrens * txg_wait_open(dmu_objset_pool(os), 0); 136*fa9e4066Sahrens * goto top; 137*fa9e4066Sahrens * } 138*fa9e4066Sahrens * ZFS_EXIT(zfsvfs); // finished in zfs 139*fa9e4066Sahrens * return (error); // really out of space 140*fa9e4066Sahrens * } 141*fa9e4066Sahrens * error = do_real_work(); // do whatever this VOP does 142*fa9e4066Sahrens * if (error == 0) 143*fa9e4066Sahrens * seq = zfs_log_*(...); // on success, make ZIL entry 144*fa9e4066Sahrens * dmu_tx_commit(tx); // commit DMU tx -- error or not 145*fa9e4066Sahrens * rw_exit(...); // drop locks 146*fa9e4066Sahrens * zfs_dirent_unlock(dl); // unlock directory entry 147*fa9e4066Sahrens * VN_RELE(...); // release held vnodes 148*fa9e4066Sahrens * zil_commit(zilog, seq, ioflag); // synchronous when necessary 149*fa9e4066Sahrens * ZFS_EXIT(zfsvfs); // finished in zfs 150*fa9e4066Sahrens * return (error); // done, report error 151*fa9e4066Sahrens */ 152*fa9e4066Sahrens 153*fa9e4066Sahrens /* ARGSUSED */ 154*fa9e4066Sahrens static int 155*fa9e4066Sahrens zfs_open(vnode_t **vpp, int flag, cred_t *cr) 156*fa9e4066Sahrens { 157*fa9e4066Sahrens return (0); 158*fa9e4066Sahrens } 159*fa9e4066Sahrens 160*fa9e4066Sahrens /* ARGSUSED */ 161*fa9e4066Sahrens static int 162*fa9e4066Sahrens zfs_close(vnode_t *vp, int flag, int count, offset_t offset, cred_t *cr) 163*fa9e4066Sahrens { 164*fa9e4066Sahrens /* 165*fa9e4066Sahrens * Clean up any locks held by this process on the vp. 166*fa9e4066Sahrens */ 167*fa9e4066Sahrens cleanlocks(vp, ddi_get_pid(), 0); 168*fa9e4066Sahrens cleanshares(vp, ddi_get_pid()); 169*fa9e4066Sahrens 170*fa9e4066Sahrens return (0); 171*fa9e4066Sahrens } 172*fa9e4066Sahrens 173*fa9e4066Sahrens /* 174*fa9e4066Sahrens * Lseek support for finding holes (cmd == _FIO_SEEK_HOLE) and 175*fa9e4066Sahrens * data (cmd == _FIO_SEEK_DATA). "off" is an in/out parameter. 176*fa9e4066Sahrens */ 177*fa9e4066Sahrens static int 178*fa9e4066Sahrens zfs_holey(vnode_t *vp, int cmd, offset_t *off) 179*fa9e4066Sahrens { 180*fa9e4066Sahrens znode_t *zp = VTOZ(vp); 181*fa9e4066Sahrens uint64_t noff = (uint64_t)*off; /* new offset */ 182*fa9e4066Sahrens uint64_t file_sz; 183*fa9e4066Sahrens int error; 184*fa9e4066Sahrens boolean_t hole; 185*fa9e4066Sahrens 186*fa9e4066Sahrens rw_enter(&zp->z_grow_lock, RW_READER); 187*fa9e4066Sahrens file_sz = zp->z_phys->zp_size; 188*fa9e4066Sahrens if (noff >= file_sz) { 189*fa9e4066Sahrens rw_exit(&zp->z_grow_lock); 190*fa9e4066Sahrens return (ENXIO); 191*fa9e4066Sahrens } 192*fa9e4066Sahrens 193*fa9e4066Sahrens if (cmd == _FIO_SEEK_HOLE) 194*fa9e4066Sahrens hole = B_TRUE; 195*fa9e4066Sahrens else 196*fa9e4066Sahrens hole = B_FALSE; 197*fa9e4066Sahrens 198*fa9e4066Sahrens error = dmu_offset_next(zp->z_zfsvfs->z_os, zp->z_id, hole, &noff); 199*fa9e4066Sahrens rw_exit(&zp->z_grow_lock); 200*fa9e4066Sahrens 201*fa9e4066Sahrens /* end of file? */ 202*fa9e4066Sahrens if ((error == ESRCH) || (noff > file_sz)) { 203*fa9e4066Sahrens /* 204*fa9e4066Sahrens * Handle the virtual hole at the end of file. 205*fa9e4066Sahrens */ 206*fa9e4066Sahrens if (hole) { 207*fa9e4066Sahrens *off = file_sz; 208*fa9e4066Sahrens return (0); 209*fa9e4066Sahrens } 210*fa9e4066Sahrens return (ENXIO); 211*fa9e4066Sahrens } 212*fa9e4066Sahrens 213*fa9e4066Sahrens if (noff < *off) 214*fa9e4066Sahrens return (error); 215*fa9e4066Sahrens *off = noff; 216*fa9e4066Sahrens return (error); 217*fa9e4066Sahrens } 218*fa9e4066Sahrens 219*fa9e4066Sahrens /* ARGSUSED */ 220*fa9e4066Sahrens static int 221*fa9e4066Sahrens zfs_ioctl(vnode_t *vp, int com, intptr_t data, int flag, cred_t *cred, 222*fa9e4066Sahrens int *rvalp) 223*fa9e4066Sahrens { 224*fa9e4066Sahrens offset_t off; 225*fa9e4066Sahrens int error; 226*fa9e4066Sahrens zfsvfs_t *zfsvfs; 227*fa9e4066Sahrens 228*fa9e4066Sahrens switch (com) { 229*fa9e4066Sahrens case _FIOFFS: 230*fa9e4066Sahrens return (zfs_sync(vp->v_vfsp, 0, cred)); 231*fa9e4066Sahrens 232*fa9e4066Sahrens case _FIO_SEEK_DATA: 233*fa9e4066Sahrens case _FIO_SEEK_HOLE: 234*fa9e4066Sahrens if (ddi_copyin((void *)data, &off, sizeof (off), flag)) 235*fa9e4066Sahrens return (EFAULT); 236*fa9e4066Sahrens 237*fa9e4066Sahrens zfsvfs = VTOZ(vp)->z_zfsvfs; 238*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 239*fa9e4066Sahrens 240*fa9e4066Sahrens /* offset parameter is in/out */ 241*fa9e4066Sahrens error = zfs_holey(vp, com, &off); 242*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 243*fa9e4066Sahrens if (error) 244*fa9e4066Sahrens return (error); 245*fa9e4066Sahrens if (ddi_copyout(&off, (void *)data, sizeof (off), flag)) 246*fa9e4066Sahrens return (EFAULT); 247*fa9e4066Sahrens return (0); 248*fa9e4066Sahrens } 249*fa9e4066Sahrens return (ENOTTY); 250*fa9e4066Sahrens } 251*fa9e4066Sahrens 252*fa9e4066Sahrens /* 253*fa9e4066Sahrens * When a file is memory mapped, we must keep the IO data synchronized 254*fa9e4066Sahrens * between the DMU cache and the memory mapped pages. What this means: 255*fa9e4066Sahrens * 256*fa9e4066Sahrens * On Write: If we find a memory mapped page, we write to *both* 257*fa9e4066Sahrens * the page and the dmu buffer. 258*fa9e4066Sahrens * 259*fa9e4066Sahrens * NOTE: We will always "break up" the IO into PAGESIZE uiomoves when 260*fa9e4066Sahrens * the file is memory mapped. 261*fa9e4066Sahrens */ 262*fa9e4066Sahrens static int 263*fa9e4066Sahrens mappedwrite(vnode_t *vp, uint64_t woff, int nbytes, uio_t *uio, dmu_tx_t *tx) 264*fa9e4066Sahrens { 265*fa9e4066Sahrens znode_t *zp = VTOZ(vp); 266*fa9e4066Sahrens zfsvfs_t *zfsvfs = zp->z_zfsvfs; 267*fa9e4066Sahrens int64_t start, off; 268*fa9e4066Sahrens int len = nbytes; 269*fa9e4066Sahrens int error = 0; 270*fa9e4066Sahrens 271*fa9e4066Sahrens start = uio->uio_loffset; 272*fa9e4066Sahrens off = start & PAGEOFFSET; 273*fa9e4066Sahrens for (start &= PAGEMASK; len > 0; start += PAGESIZE) { 274*fa9e4066Sahrens page_t *pp; 275*fa9e4066Sahrens uint64_t bytes = MIN(PAGESIZE - off, len); 276*fa9e4066Sahrens 277*fa9e4066Sahrens /* 278*fa9e4066Sahrens * We don't want a new page to "appear" in the middle of 279*fa9e4066Sahrens * the file update (because it may not get the write 280*fa9e4066Sahrens * update data), so we grab a lock to block 281*fa9e4066Sahrens * zfs_getpage(). 282*fa9e4066Sahrens */ 283*fa9e4066Sahrens rw_enter(&zp->z_map_lock, RW_WRITER); 284*fa9e4066Sahrens if (pp = page_lookup(vp, start, SE_SHARED)) { 285*fa9e4066Sahrens caddr_t va; 286*fa9e4066Sahrens 287*fa9e4066Sahrens rw_exit(&zp->z_map_lock); 288*fa9e4066Sahrens va = ppmapin(pp, PROT_READ | PROT_WRITE, (caddr_t)-1L); 289*fa9e4066Sahrens error = uiomove(va+off, bytes, UIO_WRITE, uio); 290*fa9e4066Sahrens if (error == 0) { 291*fa9e4066Sahrens dmu_write(zfsvfs->z_os, zp->z_id, 292*fa9e4066Sahrens woff, bytes, va+off, tx); 293*fa9e4066Sahrens } 294*fa9e4066Sahrens ppmapout(va); 295*fa9e4066Sahrens page_unlock(pp); 296*fa9e4066Sahrens } else { 297*fa9e4066Sahrens error = dmu_write_uio(zfsvfs->z_os, zp->z_id, 298*fa9e4066Sahrens woff, bytes, uio, tx); 299*fa9e4066Sahrens rw_exit(&zp->z_map_lock); 300*fa9e4066Sahrens } 301*fa9e4066Sahrens len -= bytes; 302*fa9e4066Sahrens woff += bytes; 303*fa9e4066Sahrens off = 0; 304*fa9e4066Sahrens if (error) 305*fa9e4066Sahrens break; 306*fa9e4066Sahrens } 307*fa9e4066Sahrens return (error); 308*fa9e4066Sahrens } 309*fa9e4066Sahrens 310*fa9e4066Sahrens /* 311*fa9e4066Sahrens * When a file is memory mapped, we must keep the IO data synchronized 312*fa9e4066Sahrens * between the DMU cache and the memory mapped pages. What this means: 313*fa9e4066Sahrens * 314*fa9e4066Sahrens * On Read: We "read" preferentially from memory mapped pages, 315*fa9e4066Sahrens * else we default from the dmu buffer. 316*fa9e4066Sahrens * 317*fa9e4066Sahrens * NOTE: We will always "break up" the IO into PAGESIZE uiomoves when 318*fa9e4066Sahrens * the file is memory mapped. 319*fa9e4066Sahrens */ 320*fa9e4066Sahrens static int 321*fa9e4066Sahrens mappedread(vnode_t *vp, char *addr, int nbytes, uio_t *uio) 322*fa9e4066Sahrens { 323*fa9e4066Sahrens int64_t start, off, bytes; 324*fa9e4066Sahrens int len = nbytes; 325*fa9e4066Sahrens int error = 0; 326*fa9e4066Sahrens 327*fa9e4066Sahrens start = uio->uio_loffset; 328*fa9e4066Sahrens off = start & PAGEOFFSET; 329*fa9e4066Sahrens for (start &= PAGEMASK; len > 0; start += PAGESIZE) { 330*fa9e4066Sahrens page_t *pp; 331*fa9e4066Sahrens 332*fa9e4066Sahrens bytes = MIN(PAGESIZE - off, len); 333*fa9e4066Sahrens if (pp = page_lookup(vp, start, SE_SHARED)) { 334*fa9e4066Sahrens caddr_t va; 335*fa9e4066Sahrens 336*fa9e4066Sahrens va = ppmapin(pp, PROT_READ | PROT_WRITE, (caddr_t)-1L); 337*fa9e4066Sahrens error = uiomove(va + off, bytes, UIO_READ, uio); 338*fa9e4066Sahrens ppmapout(va); 339*fa9e4066Sahrens page_unlock(pp); 340*fa9e4066Sahrens } else { 341*fa9e4066Sahrens /* XXX use dmu_read here? */ 342*fa9e4066Sahrens error = uiomove(addr, bytes, UIO_READ, uio); 343*fa9e4066Sahrens } 344*fa9e4066Sahrens len -= bytes; 345*fa9e4066Sahrens addr += bytes; 346*fa9e4066Sahrens off = 0; 347*fa9e4066Sahrens if (error) 348*fa9e4066Sahrens break; 349*fa9e4066Sahrens } 350*fa9e4066Sahrens return (error); 351*fa9e4066Sahrens } 352*fa9e4066Sahrens 353*fa9e4066Sahrens uint_t zfs_read_chunk_size = 1024 * 1024; /* Tunable */ 354*fa9e4066Sahrens 355*fa9e4066Sahrens /* 356*fa9e4066Sahrens * Read bytes from specified file into supplied buffer. 357*fa9e4066Sahrens * 358*fa9e4066Sahrens * IN: vp - vnode of file to be read from. 359*fa9e4066Sahrens * uio - structure supplying read location, range info, 360*fa9e4066Sahrens * and return buffer. 361*fa9e4066Sahrens * ioflag - SYNC flags; used to provide FRSYNC semantics. 362*fa9e4066Sahrens * cr - credentials of caller. 363*fa9e4066Sahrens * 364*fa9e4066Sahrens * OUT: uio - updated offset and range, buffer filled. 365*fa9e4066Sahrens * 366*fa9e4066Sahrens * RETURN: 0 if success 367*fa9e4066Sahrens * error code if failure 368*fa9e4066Sahrens * 369*fa9e4066Sahrens * Side Effects: 370*fa9e4066Sahrens * vp - atime updated if byte count > 0 371*fa9e4066Sahrens */ 372*fa9e4066Sahrens /* ARGSUSED */ 373*fa9e4066Sahrens static int 374*fa9e4066Sahrens zfs_read(vnode_t *vp, uio_t *uio, int ioflag, cred_t *cr, caller_context_t *ct) 375*fa9e4066Sahrens { 376*fa9e4066Sahrens znode_t *zp = VTOZ(vp); 377*fa9e4066Sahrens zfsvfs_t *zfsvfs = zp->z_zfsvfs; 378*fa9e4066Sahrens uint64_t delta; 379*fa9e4066Sahrens ssize_t n, size, cnt, ndone; 380*fa9e4066Sahrens int error, i, numbufs; 381*fa9e4066Sahrens dmu_buf_t *dbp, **dbpp; 382*fa9e4066Sahrens 383*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 384*fa9e4066Sahrens 385*fa9e4066Sahrens /* 386*fa9e4066Sahrens * Validate file offset 387*fa9e4066Sahrens */ 388*fa9e4066Sahrens if (uio->uio_loffset < (offset_t)0) { 389*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 390*fa9e4066Sahrens return (EINVAL); 391*fa9e4066Sahrens } 392*fa9e4066Sahrens 393*fa9e4066Sahrens /* 394*fa9e4066Sahrens * Fasttrack empty reads 395*fa9e4066Sahrens */ 396*fa9e4066Sahrens if (uio->uio_resid == 0) { 397*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 398*fa9e4066Sahrens return (0); 399*fa9e4066Sahrens } 400*fa9e4066Sahrens 401*fa9e4066Sahrens /* 402*fa9e4066Sahrens * Check for region locks 403*fa9e4066Sahrens */ 404*fa9e4066Sahrens if (MANDMODE((mode_t)zp->z_phys->zp_mode)) { 405*fa9e4066Sahrens if (error = chklock(vp, FREAD, 406*fa9e4066Sahrens uio->uio_loffset, uio->uio_resid, uio->uio_fmode, ct)) { 407*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 408*fa9e4066Sahrens return (error); 409*fa9e4066Sahrens } 410*fa9e4066Sahrens } 411*fa9e4066Sahrens 412*fa9e4066Sahrens /* 413*fa9e4066Sahrens * If we're in FRSYNC mode, sync out this znode before reading it. 414*fa9e4066Sahrens */ 415*fa9e4066Sahrens zil_commit(zfsvfs->z_log, zp->z_last_itx, ioflag & FRSYNC); 416*fa9e4066Sahrens 417*fa9e4066Sahrens /* 418*fa9e4066Sahrens * Make sure nobody restructures the file (changes block size) 419*fa9e4066Sahrens * in the middle of the read. 420*fa9e4066Sahrens */ 421*fa9e4066Sahrens rw_enter(&zp->z_grow_lock, RW_READER); 422*fa9e4066Sahrens /* 423*fa9e4066Sahrens * If we are reading past end-of-file we can skip 424*fa9e4066Sahrens * to the end; but we might still need to set atime. 425*fa9e4066Sahrens */ 426*fa9e4066Sahrens if (uio->uio_loffset >= zp->z_phys->zp_size) { 427*fa9e4066Sahrens cnt = 0; 428*fa9e4066Sahrens error = 0; 429*fa9e4066Sahrens goto out; 430*fa9e4066Sahrens } 431*fa9e4066Sahrens 432*fa9e4066Sahrens cnt = MIN(uio->uio_resid, zp->z_phys->zp_size - uio->uio_loffset); 433*fa9e4066Sahrens 434*fa9e4066Sahrens for (ndone = 0; ndone < cnt; ndone += zfs_read_chunk_size) { 435*fa9e4066Sahrens ASSERT(uio->uio_loffset < zp->z_phys->zp_size); 436*fa9e4066Sahrens n = MIN(zfs_read_chunk_size, 437*fa9e4066Sahrens zp->z_phys->zp_size - uio->uio_loffset); 438*fa9e4066Sahrens n = MIN(n, cnt); 439*fa9e4066Sahrens dbpp = dmu_buf_hold_array(zfsvfs->z_os, zp->z_id, 440*fa9e4066Sahrens uio->uio_loffset, n, &numbufs); 441*fa9e4066Sahrens if (error = dmu_buf_read_array_canfail(dbpp, numbufs)) { 442*fa9e4066Sahrens dmu_buf_rele_array(dbpp, numbufs); 443*fa9e4066Sahrens goto out; 444*fa9e4066Sahrens } 445*fa9e4066Sahrens /* 446*fa9e4066Sahrens * Compute the adjustment to align the dmu buffers 447*fa9e4066Sahrens * with the uio buffer. 448*fa9e4066Sahrens */ 449*fa9e4066Sahrens delta = uio->uio_loffset - dbpp[0]->db_offset; 450*fa9e4066Sahrens 451*fa9e4066Sahrens for (i = 0; i < numbufs; i++) { 452*fa9e4066Sahrens if (n < 0) 453*fa9e4066Sahrens break; 454*fa9e4066Sahrens dbp = dbpp[i]; 455*fa9e4066Sahrens size = dbp->db_size - delta; 456*fa9e4066Sahrens /* 457*fa9e4066Sahrens * XXX -- this is correct, but may be suboptimal. 458*fa9e4066Sahrens * If the pages are all clean, we don't need to 459*fa9e4066Sahrens * go through mappedread(). Maybe the VMODSORT 460*fa9e4066Sahrens * stuff can help us here. 461*fa9e4066Sahrens */ 462*fa9e4066Sahrens if (vn_has_cached_data(vp)) { 463*fa9e4066Sahrens error = mappedread(vp, (caddr_t)dbp->db_data + 464*fa9e4066Sahrens delta, (n < size ? n : size), uio); 465*fa9e4066Sahrens } else { 466*fa9e4066Sahrens error = uiomove((caddr_t)dbp->db_data + delta, 467*fa9e4066Sahrens (n < size ? n : size), UIO_READ, uio); 468*fa9e4066Sahrens } 469*fa9e4066Sahrens if (error) { 470*fa9e4066Sahrens dmu_buf_rele_array(dbpp, numbufs); 471*fa9e4066Sahrens goto out; 472*fa9e4066Sahrens } 473*fa9e4066Sahrens n -= dbp->db_size; 474*fa9e4066Sahrens if (delta) { 475*fa9e4066Sahrens n += delta; 476*fa9e4066Sahrens delta = 0; 477*fa9e4066Sahrens } 478*fa9e4066Sahrens } 479*fa9e4066Sahrens dmu_buf_rele_array(dbpp, numbufs); 480*fa9e4066Sahrens } 481*fa9e4066Sahrens out: 482*fa9e4066Sahrens rw_exit(&zp->z_grow_lock); 483*fa9e4066Sahrens 484*fa9e4066Sahrens ZFS_ACCESSTIME_STAMP(zfsvfs, zp); 485*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 486*fa9e4066Sahrens return (error); 487*fa9e4066Sahrens } 488*fa9e4066Sahrens 489*fa9e4066Sahrens /* 490*fa9e4066Sahrens * Fault in the pages of the first n bytes specified by the uio structure. 491*fa9e4066Sahrens * 1 byte in each page is touched and the uio struct is unmodified. 492*fa9e4066Sahrens * Any error will exit this routine as this is only a best 493*fa9e4066Sahrens * attempt to get the pages resident. This is a copy of ufs_trans_touch(). 494*fa9e4066Sahrens */ 495*fa9e4066Sahrens static void 496*fa9e4066Sahrens zfs_prefault_write(ssize_t n, struct uio *uio) 497*fa9e4066Sahrens { 498*fa9e4066Sahrens struct iovec *iov; 499*fa9e4066Sahrens ulong_t cnt, incr; 500*fa9e4066Sahrens caddr_t p; 501*fa9e4066Sahrens uint8_t tmp; 502*fa9e4066Sahrens 503*fa9e4066Sahrens iov = uio->uio_iov; 504*fa9e4066Sahrens 505*fa9e4066Sahrens while (n) { 506*fa9e4066Sahrens cnt = MIN(iov->iov_len, n); 507*fa9e4066Sahrens if (cnt == 0) { 508*fa9e4066Sahrens /* empty iov entry */ 509*fa9e4066Sahrens iov++; 510*fa9e4066Sahrens continue; 511*fa9e4066Sahrens } 512*fa9e4066Sahrens n -= cnt; 513*fa9e4066Sahrens /* 514*fa9e4066Sahrens * touch each page in this segment. 515*fa9e4066Sahrens */ 516*fa9e4066Sahrens p = iov->iov_base; 517*fa9e4066Sahrens while (cnt) { 518*fa9e4066Sahrens switch (uio->uio_segflg) { 519*fa9e4066Sahrens case UIO_USERSPACE: 520*fa9e4066Sahrens case UIO_USERISPACE: 521*fa9e4066Sahrens if (fuword8(p, &tmp)) 522*fa9e4066Sahrens return; 523*fa9e4066Sahrens break; 524*fa9e4066Sahrens case UIO_SYSSPACE: 525*fa9e4066Sahrens if (kcopy(p, &tmp, 1)) 526*fa9e4066Sahrens return; 527*fa9e4066Sahrens break; 528*fa9e4066Sahrens } 529*fa9e4066Sahrens incr = MIN(cnt, PAGESIZE); 530*fa9e4066Sahrens p += incr; 531*fa9e4066Sahrens cnt -= incr; 532*fa9e4066Sahrens } 533*fa9e4066Sahrens /* 534*fa9e4066Sahrens * touch the last byte in case it straddles a page. 535*fa9e4066Sahrens */ 536*fa9e4066Sahrens p--; 537*fa9e4066Sahrens switch (uio->uio_segflg) { 538*fa9e4066Sahrens case UIO_USERSPACE: 539*fa9e4066Sahrens case UIO_USERISPACE: 540*fa9e4066Sahrens if (fuword8(p, &tmp)) 541*fa9e4066Sahrens return; 542*fa9e4066Sahrens break; 543*fa9e4066Sahrens case UIO_SYSSPACE: 544*fa9e4066Sahrens if (kcopy(p, &tmp, 1)) 545*fa9e4066Sahrens return; 546*fa9e4066Sahrens break; 547*fa9e4066Sahrens } 548*fa9e4066Sahrens iov++; 549*fa9e4066Sahrens } 550*fa9e4066Sahrens } 551*fa9e4066Sahrens 552*fa9e4066Sahrens /* 553*fa9e4066Sahrens * Write the bytes to a file. 554*fa9e4066Sahrens * 555*fa9e4066Sahrens * IN: vp - vnode of file to be written to. 556*fa9e4066Sahrens * uio - structure supplying write location, range info, 557*fa9e4066Sahrens * and data buffer. 558*fa9e4066Sahrens * ioflag - FAPPEND flag set if in append mode. 559*fa9e4066Sahrens * cr - credentials of caller. 560*fa9e4066Sahrens * 561*fa9e4066Sahrens * OUT: uio - updated offset and range. 562*fa9e4066Sahrens * 563*fa9e4066Sahrens * RETURN: 0 if success 564*fa9e4066Sahrens * error code if failure 565*fa9e4066Sahrens * 566*fa9e4066Sahrens * Timestamps: 567*fa9e4066Sahrens * vp - ctime|mtime updated if byte count > 0 568*fa9e4066Sahrens * 569*fa9e4066Sahrens * Note: zfs_write() holds z_append_lock across calls to txg_wait_open(). 570*fa9e4066Sahrens * It has to because of the semantics of FAPPEND. The implication is that 571*fa9e4066Sahrens * we must never grab z_append_lock while in an assigned tx. 572*fa9e4066Sahrens */ 573*fa9e4066Sahrens /* ARGSUSED */ 574*fa9e4066Sahrens static int 575*fa9e4066Sahrens zfs_write(vnode_t *vp, uio_t *uio, int ioflag, cred_t *cr, caller_context_t *ct) 576*fa9e4066Sahrens { 577*fa9e4066Sahrens znode_t *zp = VTOZ(vp); 578*fa9e4066Sahrens rlim64_t limit = uio->uio_llimit; 579*fa9e4066Sahrens ssize_t start_resid = uio->uio_resid; 580*fa9e4066Sahrens ssize_t tx_bytes; 581*fa9e4066Sahrens uint64_t end_size; 582*fa9e4066Sahrens dmu_tx_t *tx; 583*fa9e4066Sahrens zfsvfs_t *zfsvfs = zp->z_zfsvfs; 584*fa9e4066Sahrens zilog_t *zilog = zfsvfs->z_log; 585*fa9e4066Sahrens uint64_t seq = 0; 586*fa9e4066Sahrens offset_t woff; 587*fa9e4066Sahrens ssize_t n, nbytes; 588*fa9e4066Sahrens int max_blksz = zfsvfs->z_max_blksz; 589*fa9e4066Sahrens int need_append_lock, error; 590*fa9e4066Sahrens krw_t grow_rw = RW_READER; 591*fa9e4066Sahrens 592*fa9e4066Sahrens if (limit == RLIM64_INFINITY || limit > MAXOFFSET_T) 593*fa9e4066Sahrens limit = MAXOFFSET_T; 594*fa9e4066Sahrens 595*fa9e4066Sahrens n = start_resid; 596*fa9e4066Sahrens 597*fa9e4066Sahrens /* 598*fa9e4066Sahrens * Fasttrack empty write 599*fa9e4066Sahrens */ 600*fa9e4066Sahrens if (n == 0) 601*fa9e4066Sahrens return (0); 602*fa9e4066Sahrens 603*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 604*fa9e4066Sahrens 605*fa9e4066Sahrens /* 606*fa9e4066Sahrens * Pre-fault the pages to ensure slow (eg NFS) pages don't hold up txg 607*fa9e4066Sahrens */ 608*fa9e4066Sahrens zfs_prefault_write(MIN(start_resid, SPA_MAXBLOCKSIZE), uio); 609*fa9e4066Sahrens 610*fa9e4066Sahrens /* 611*fa9e4066Sahrens * If in append mode, set the io offset pointer to eof. 612*fa9e4066Sahrens */ 613*fa9e4066Sahrens need_append_lock = ioflag & FAPPEND; 614*fa9e4066Sahrens if (need_append_lock) { 615*fa9e4066Sahrens rw_enter(&zp->z_append_lock, RW_WRITER); 616*fa9e4066Sahrens woff = uio->uio_loffset = zp->z_phys->zp_size; 617*fa9e4066Sahrens } else { 618*fa9e4066Sahrens woff = uio->uio_loffset; 619*fa9e4066Sahrens /* 620*fa9e4066Sahrens * Validate file offset 621*fa9e4066Sahrens */ 622*fa9e4066Sahrens if (woff < 0) { 623*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 624*fa9e4066Sahrens return (EINVAL); 625*fa9e4066Sahrens } 626*fa9e4066Sahrens 627*fa9e4066Sahrens /* 628*fa9e4066Sahrens * If this write could change the file length, 629*fa9e4066Sahrens * we need to synchronize with "appenders". 630*fa9e4066Sahrens */ 631*fa9e4066Sahrens if (woff < limit - n && woff + n > zp->z_phys->zp_size) { 632*fa9e4066Sahrens need_append_lock = TRUE; 633*fa9e4066Sahrens rw_enter(&zp->z_append_lock, RW_READER); 634*fa9e4066Sahrens } 635*fa9e4066Sahrens } 636*fa9e4066Sahrens 637*fa9e4066Sahrens if (woff >= limit) { 638*fa9e4066Sahrens error = EFBIG; 639*fa9e4066Sahrens goto no_tx_done; 640*fa9e4066Sahrens } 641*fa9e4066Sahrens 642*fa9e4066Sahrens if ((woff + n) > limit || woff > (limit - n)) 643*fa9e4066Sahrens n = limit - woff; 644*fa9e4066Sahrens 645*fa9e4066Sahrens /* 646*fa9e4066Sahrens * Check for region locks 647*fa9e4066Sahrens */ 648*fa9e4066Sahrens if (MANDMODE((mode_t)zp->z_phys->zp_mode) && 649*fa9e4066Sahrens (error = chklock(vp, FWRITE, woff, n, uio->uio_fmode, ct)) != 0) 650*fa9e4066Sahrens goto no_tx_done; 651*fa9e4066Sahrens top: 652*fa9e4066Sahrens /* 653*fa9e4066Sahrens * Make sure nobody restructures the file (changes block size) 654*fa9e4066Sahrens * in the middle of the write. 655*fa9e4066Sahrens */ 656*fa9e4066Sahrens rw_enter(&zp->z_grow_lock, grow_rw); 657*fa9e4066Sahrens 658*fa9e4066Sahrens end_size = MAX(zp->z_phys->zp_size, woff + n); 659*fa9e4066Sahrens tx = dmu_tx_create(zfsvfs->z_os); 660*fa9e4066Sahrens dmu_tx_hold_bonus(tx, zp->z_id); 661*fa9e4066Sahrens dmu_tx_hold_write(tx, zp->z_id, woff, MIN(n, max_blksz)); 662*fa9e4066Sahrens error = dmu_tx_assign(tx, zfsvfs->z_assign); 663*fa9e4066Sahrens if (error) { 664*fa9e4066Sahrens dmu_tx_abort(tx); 665*fa9e4066Sahrens rw_exit(&zp->z_grow_lock); 666*fa9e4066Sahrens if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { 667*fa9e4066Sahrens txg_wait_open(dmu_objset_pool(zfsvfs->z_os), 0); 668*fa9e4066Sahrens goto top; 669*fa9e4066Sahrens } 670*fa9e4066Sahrens goto no_tx_done; 671*fa9e4066Sahrens } 672*fa9e4066Sahrens 673*fa9e4066Sahrens if (end_size > zp->z_blksz && 674*fa9e4066Sahrens (!ISP2(zp->z_blksz) || zp->z_blksz < max_blksz)) { 675*fa9e4066Sahrens uint64_t new_blksz; 676*fa9e4066Sahrens /* 677*fa9e4066Sahrens * This write will increase the file size beyond 678*fa9e4066Sahrens * the current block size so increase the block size. 679*fa9e4066Sahrens */ 680*fa9e4066Sahrens if (grow_rw == RW_READER && !rw_tryupgrade(&zp->z_grow_lock)) { 681*fa9e4066Sahrens dmu_tx_commit(tx); 682*fa9e4066Sahrens rw_exit(&zp->z_grow_lock); 683*fa9e4066Sahrens grow_rw = RW_WRITER; 684*fa9e4066Sahrens goto top; 685*fa9e4066Sahrens } 686*fa9e4066Sahrens if (zp->z_blksz > max_blksz) { 687*fa9e4066Sahrens ASSERT(!ISP2(zp->z_blksz)); 688*fa9e4066Sahrens new_blksz = MIN(end_size, SPA_MAXBLOCKSIZE); 689*fa9e4066Sahrens } else { 690*fa9e4066Sahrens new_blksz = MIN(end_size, max_blksz); 691*fa9e4066Sahrens } 692*fa9e4066Sahrens error = zfs_grow_blocksize(zp, new_blksz, tx); 693*fa9e4066Sahrens if (error) { 694*fa9e4066Sahrens tx_bytes = 0; 695*fa9e4066Sahrens goto tx_done; 696*fa9e4066Sahrens } 697*fa9e4066Sahrens } 698*fa9e4066Sahrens 699*fa9e4066Sahrens if (grow_rw == RW_WRITER) { 700*fa9e4066Sahrens rw_downgrade(&zp->z_grow_lock); 701*fa9e4066Sahrens grow_rw = RW_READER; 702*fa9e4066Sahrens } 703*fa9e4066Sahrens 704*fa9e4066Sahrens /* 705*fa9e4066Sahrens * The file data does not fit in the znode "cache", so we 706*fa9e4066Sahrens * will be writing to the file block data buffers. 707*fa9e4066Sahrens * Each buffer will be written in a separate transaction; 708*fa9e4066Sahrens * this keeps the intent log records small and allows us 709*fa9e4066Sahrens * to do more fine-grained space accounting. 710*fa9e4066Sahrens */ 711*fa9e4066Sahrens while (n > 0) { 712*fa9e4066Sahrens /* 713*fa9e4066Sahrens * XXX - should we really limit each write to z_max_blksz? 714*fa9e4066Sahrens * Perhaps we should use SPA_MAXBLOCKSIZE chunks? 715*fa9e4066Sahrens */ 716*fa9e4066Sahrens nbytes = MIN(n, max_blksz - P2PHASE(woff, max_blksz)); 717*fa9e4066Sahrens rw_enter(&zp->z_map_lock, RW_READER); 718*fa9e4066Sahrens 719*fa9e4066Sahrens tx_bytes = uio->uio_resid; 720*fa9e4066Sahrens if (vn_has_cached_data(vp)) { 721*fa9e4066Sahrens rw_exit(&zp->z_map_lock); 722*fa9e4066Sahrens error = mappedwrite(vp, woff, nbytes, uio, tx); 723*fa9e4066Sahrens } else { 724*fa9e4066Sahrens error = dmu_write_uio(zfsvfs->z_os, zp->z_id, 725*fa9e4066Sahrens woff, nbytes, uio, tx); 726*fa9e4066Sahrens rw_exit(&zp->z_map_lock); 727*fa9e4066Sahrens } 728*fa9e4066Sahrens tx_bytes -= uio->uio_resid; 729*fa9e4066Sahrens 730*fa9e4066Sahrens if (error) { 731*fa9e4066Sahrens /* XXX - do we need to "clean up" the dmu buffer? */ 732*fa9e4066Sahrens break; 733*fa9e4066Sahrens } 734*fa9e4066Sahrens 735*fa9e4066Sahrens ASSERT(tx_bytes == nbytes); 736*fa9e4066Sahrens 737*fa9e4066Sahrens n -= nbytes; 738*fa9e4066Sahrens if (n <= 0) 739*fa9e4066Sahrens break; 740*fa9e4066Sahrens 741*fa9e4066Sahrens /* 742*fa9e4066Sahrens * We have more work ahead of us, so wrap up this transaction 743*fa9e4066Sahrens * and start another. Exact same logic as tx_done below. 744*fa9e4066Sahrens */ 745*fa9e4066Sahrens while ((end_size = zp->z_phys->zp_size) < uio->uio_loffset) { 746*fa9e4066Sahrens dmu_buf_will_dirty(zp->z_dbuf, tx); 747*fa9e4066Sahrens (void) atomic_cas_64(&zp->z_phys->zp_size, end_size, 748*fa9e4066Sahrens uio->uio_loffset); 749*fa9e4066Sahrens } 750*fa9e4066Sahrens zfs_time_stamper(zp, CONTENT_MODIFIED, tx); 751*fa9e4066Sahrens seq = zfs_log_write(zilog, tx, TX_WRITE, zp, woff, tx_bytes, 752*fa9e4066Sahrens ioflag, uio); 753*fa9e4066Sahrens dmu_tx_commit(tx); 754*fa9e4066Sahrens 755*fa9e4066Sahrens /* Pre-fault the next set of pages */ 756*fa9e4066Sahrens zfs_prefault_write(MIN(n, SPA_MAXBLOCKSIZE), uio); 757*fa9e4066Sahrens 758*fa9e4066Sahrens /* 759*fa9e4066Sahrens * Start another transaction. 760*fa9e4066Sahrens */ 761*fa9e4066Sahrens woff = uio->uio_loffset; 762*fa9e4066Sahrens tx = dmu_tx_create(zfsvfs->z_os); 763*fa9e4066Sahrens dmu_tx_hold_bonus(tx, zp->z_id); 764*fa9e4066Sahrens dmu_tx_hold_write(tx, zp->z_id, woff, MIN(n, max_blksz)); 765*fa9e4066Sahrens error = dmu_tx_assign(tx, zfsvfs->z_assign); 766*fa9e4066Sahrens if (error) { 767*fa9e4066Sahrens dmu_tx_abort(tx); 768*fa9e4066Sahrens rw_exit(&zp->z_grow_lock); 769*fa9e4066Sahrens if (error == ERESTART && 770*fa9e4066Sahrens zfsvfs->z_assign == TXG_NOWAIT) { 771*fa9e4066Sahrens txg_wait_open(dmu_objset_pool(zfsvfs->z_os), 0); 772*fa9e4066Sahrens goto top; 773*fa9e4066Sahrens } 774*fa9e4066Sahrens goto no_tx_done; 775*fa9e4066Sahrens } 776*fa9e4066Sahrens } 777*fa9e4066Sahrens 778*fa9e4066Sahrens tx_done: 779*fa9e4066Sahrens 780*fa9e4066Sahrens if (tx_bytes != 0) { 781*fa9e4066Sahrens /* 782*fa9e4066Sahrens * Update the file size if it has changed; account 783*fa9e4066Sahrens * for possible concurrent updates. 784*fa9e4066Sahrens */ 785*fa9e4066Sahrens while ((end_size = zp->z_phys->zp_size) < uio->uio_loffset) { 786*fa9e4066Sahrens dmu_buf_will_dirty(zp->z_dbuf, tx); 787*fa9e4066Sahrens (void) atomic_cas_64(&zp->z_phys->zp_size, end_size, 788*fa9e4066Sahrens uio->uio_loffset); 789*fa9e4066Sahrens } 790*fa9e4066Sahrens zfs_time_stamper(zp, CONTENT_MODIFIED, tx); 791*fa9e4066Sahrens seq = zfs_log_write(zilog, tx, TX_WRITE, zp, woff, tx_bytes, 792*fa9e4066Sahrens ioflag, uio); 793*fa9e4066Sahrens } 794*fa9e4066Sahrens dmu_tx_commit(tx); 795*fa9e4066Sahrens 796*fa9e4066Sahrens rw_exit(&zp->z_grow_lock); 797*fa9e4066Sahrens 798*fa9e4066Sahrens no_tx_done: 799*fa9e4066Sahrens 800*fa9e4066Sahrens if (need_append_lock) 801*fa9e4066Sahrens rw_exit(&zp->z_append_lock); 802*fa9e4066Sahrens 803*fa9e4066Sahrens /* 804*fa9e4066Sahrens * If we're in replay mode, or we made no progress, return error. 805*fa9e4066Sahrens * Otherwise, it's at least a partial write, so it's successful. 806*fa9e4066Sahrens */ 807*fa9e4066Sahrens if (zfsvfs->z_assign >= TXG_INITIAL || uio->uio_resid == start_resid) { 808*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 809*fa9e4066Sahrens return (error); 810*fa9e4066Sahrens } 811*fa9e4066Sahrens 812*fa9e4066Sahrens zil_commit(zilog, seq, ioflag & (FSYNC | FDSYNC)); 813*fa9e4066Sahrens 814*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 815*fa9e4066Sahrens return (0); 816*fa9e4066Sahrens } 817*fa9e4066Sahrens 818*fa9e4066Sahrens /* 819*fa9e4066Sahrens * Get data to generate a TX_WRITE intent log record. 820*fa9e4066Sahrens */ 821*fa9e4066Sahrens int 822*fa9e4066Sahrens zfs_get_data(void *arg, lr_write_t *lr) 823*fa9e4066Sahrens { 824*fa9e4066Sahrens zfsvfs_t *zfsvfs = arg; 825*fa9e4066Sahrens objset_t *os = zfsvfs->z_os; 826*fa9e4066Sahrens znode_t *zp; 827*fa9e4066Sahrens uint64_t off = lr->lr_offset; 828*fa9e4066Sahrens int dlen = lr->lr_length; /* length of user data */ 829*fa9e4066Sahrens int reclen = lr->lr_common.lrc_reclen; 830*fa9e4066Sahrens int error = 0; 831*fa9e4066Sahrens 832*fa9e4066Sahrens ASSERT(dlen != 0); 833*fa9e4066Sahrens 834*fa9e4066Sahrens /* 835*fa9e4066Sahrens * Nothing to do if the file has been removed or truncated. 836*fa9e4066Sahrens */ 837*fa9e4066Sahrens if (zfs_zget(zfsvfs, lr->lr_foid, &zp) != 0) 838*fa9e4066Sahrens return (ENOENT); 839*fa9e4066Sahrens if (off >= zp->z_phys->zp_size || zp->z_reap) { 840*fa9e4066Sahrens VN_RELE(ZTOV(zp)); 841*fa9e4066Sahrens return (ENOENT); 842*fa9e4066Sahrens } 843*fa9e4066Sahrens 844*fa9e4066Sahrens /* 845*fa9e4066Sahrens * Write records come in two flavors: immediate and indirect. 846*fa9e4066Sahrens * For small writes it's cheaper to store the data with the 847*fa9e4066Sahrens * log record (immediate); for large writes it's cheaper to 848*fa9e4066Sahrens * sync the data and get a pointer to it (indirect) so that 849*fa9e4066Sahrens * we don't have to write the data twice. 850*fa9e4066Sahrens */ 851*fa9e4066Sahrens if (sizeof (lr_write_t) + dlen <= reclen) { /* immediate write */ 852*fa9e4066Sahrens rw_enter(&zp->z_grow_lock, RW_READER); 853*fa9e4066Sahrens dmu_buf_t *db = dmu_buf_hold(os, lr->lr_foid, off); 854*fa9e4066Sahrens dmu_buf_read(db); 855*fa9e4066Sahrens bcopy((char *)db->db_data + off - db->db_offset, lr + 1, dlen); 856*fa9e4066Sahrens dmu_buf_rele(db); 857*fa9e4066Sahrens rw_exit(&zp->z_grow_lock); 858*fa9e4066Sahrens } else { 859*fa9e4066Sahrens /* 860*fa9e4066Sahrens * We have to grab z_grow_lock as RW_WRITER because 861*fa9e4066Sahrens * dmu_sync() can't handle concurrent dbuf_dirty() (6313856). 862*fa9e4066Sahrens * z_grow_lock will be replaced with a range lock soon, 863*fa9e4066Sahrens * which will eliminate the concurrency hit, but dmu_sync() 864*fa9e4066Sahrens * really needs more thought. It shouldn't have to rely on 865*fa9e4066Sahrens * the caller to provide MT safety. 866*fa9e4066Sahrens */ 867*fa9e4066Sahrens rw_enter(&zp->z_grow_lock, RW_WRITER); 868*fa9e4066Sahrens txg_suspend(dmu_objset_pool(os)); 869*fa9e4066Sahrens error = dmu_sync(os, lr->lr_foid, off, &lr->lr_blkoff, 870*fa9e4066Sahrens &lr->lr_blkptr, lr->lr_common.lrc_txg); 871*fa9e4066Sahrens txg_resume(dmu_objset_pool(os)); 872*fa9e4066Sahrens rw_exit(&zp->z_grow_lock); 873*fa9e4066Sahrens } 874*fa9e4066Sahrens VN_RELE(ZTOV(zp)); 875*fa9e4066Sahrens return (error); 876*fa9e4066Sahrens } 877*fa9e4066Sahrens 878*fa9e4066Sahrens /*ARGSUSED*/ 879*fa9e4066Sahrens static int 880*fa9e4066Sahrens zfs_access(vnode_t *vp, int mode, int flags, cred_t *cr) 881*fa9e4066Sahrens { 882*fa9e4066Sahrens znode_t *zp = VTOZ(vp); 883*fa9e4066Sahrens zfsvfs_t *zfsvfs = zp->z_zfsvfs; 884*fa9e4066Sahrens int error; 885*fa9e4066Sahrens 886*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 887*fa9e4066Sahrens error = zfs_zaccess_rwx(zp, mode, cr); 888*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 889*fa9e4066Sahrens return (error); 890*fa9e4066Sahrens } 891*fa9e4066Sahrens 892*fa9e4066Sahrens /* 893*fa9e4066Sahrens * Lookup an entry in a directory, or an extended attribute directory. 894*fa9e4066Sahrens * If it exists, return a held vnode reference for it. 895*fa9e4066Sahrens * 896*fa9e4066Sahrens * IN: dvp - vnode of directory to search. 897*fa9e4066Sahrens * nm - name of entry to lookup. 898*fa9e4066Sahrens * pnp - full pathname to lookup [UNUSED]. 899*fa9e4066Sahrens * flags - LOOKUP_XATTR set if looking for an attribute. 900*fa9e4066Sahrens * rdir - root directory vnode [UNUSED]. 901*fa9e4066Sahrens * cr - credentials of caller. 902*fa9e4066Sahrens * 903*fa9e4066Sahrens * OUT: vpp - vnode of located entry, NULL if not found. 904*fa9e4066Sahrens * 905*fa9e4066Sahrens * RETURN: 0 if success 906*fa9e4066Sahrens * error code if failure 907*fa9e4066Sahrens * 908*fa9e4066Sahrens * Timestamps: 909*fa9e4066Sahrens * NA 910*fa9e4066Sahrens */ 911*fa9e4066Sahrens /* ARGSUSED */ 912*fa9e4066Sahrens static int 913*fa9e4066Sahrens zfs_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, struct pathname *pnp, 914*fa9e4066Sahrens int flags, vnode_t *rdir, cred_t *cr) 915*fa9e4066Sahrens { 916*fa9e4066Sahrens 917*fa9e4066Sahrens znode_t *zdp = VTOZ(dvp); 918*fa9e4066Sahrens zfsvfs_t *zfsvfs = zdp->z_zfsvfs; 919*fa9e4066Sahrens int error; 920*fa9e4066Sahrens 921*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 922*fa9e4066Sahrens 923*fa9e4066Sahrens *vpp = NULL; 924*fa9e4066Sahrens 925*fa9e4066Sahrens if (flags & LOOKUP_XATTR) { 926*fa9e4066Sahrens /* 927*fa9e4066Sahrens * We don't allow recursive attributes.. 928*fa9e4066Sahrens * Maybe someday we will. 929*fa9e4066Sahrens */ 930*fa9e4066Sahrens if (zdp->z_phys->zp_flags & ZFS_XATTR) { 931*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 932*fa9e4066Sahrens return (EINVAL); 933*fa9e4066Sahrens } 934*fa9e4066Sahrens 935*fa9e4066Sahrens if (error = zfs_get_xattrdir(VTOZ(dvp), vpp, cr)) { 936*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 937*fa9e4066Sahrens return (error); 938*fa9e4066Sahrens } 939*fa9e4066Sahrens 940*fa9e4066Sahrens /* 941*fa9e4066Sahrens * Do we have permission to get into attribute directory? 942*fa9e4066Sahrens */ 943*fa9e4066Sahrens 944*fa9e4066Sahrens if (error = zfs_zaccess(VTOZ(*vpp), ACE_EXECUTE, cr)) { 945*fa9e4066Sahrens VN_RELE(*vpp); 946*fa9e4066Sahrens } 947*fa9e4066Sahrens 948*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 949*fa9e4066Sahrens return (error); 950*fa9e4066Sahrens } 951*fa9e4066Sahrens 952*fa9e4066Sahrens /* 953*fa9e4066Sahrens * Check accessibility of directory. 954*fa9e4066Sahrens */ 955*fa9e4066Sahrens 956*fa9e4066Sahrens if (error = zfs_zaccess(zdp, ACE_EXECUTE, cr)) { 957*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 958*fa9e4066Sahrens return (error); 959*fa9e4066Sahrens } 960*fa9e4066Sahrens 961*fa9e4066Sahrens if ((error = zfs_dirlook(zdp, nm, vpp)) == 0) { 962*fa9e4066Sahrens 963*fa9e4066Sahrens /* 964*fa9e4066Sahrens * Convert device special files 965*fa9e4066Sahrens */ 966*fa9e4066Sahrens if (IS_DEVVP(*vpp)) { 967*fa9e4066Sahrens vnode_t *svp; 968*fa9e4066Sahrens 969*fa9e4066Sahrens svp = specvp(*vpp, (*vpp)->v_rdev, (*vpp)->v_type, cr); 970*fa9e4066Sahrens VN_RELE(*vpp); 971*fa9e4066Sahrens if (svp == NULL) 972*fa9e4066Sahrens error = ENOSYS; 973*fa9e4066Sahrens else 974*fa9e4066Sahrens *vpp = svp; 975*fa9e4066Sahrens } 976*fa9e4066Sahrens } 977*fa9e4066Sahrens 978*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 979*fa9e4066Sahrens return (error); 980*fa9e4066Sahrens } 981*fa9e4066Sahrens 982*fa9e4066Sahrens /* 983*fa9e4066Sahrens * Attempt to create a new entry in a directory. If the entry 984*fa9e4066Sahrens * already exists, truncate the file if permissible, else return 985*fa9e4066Sahrens * an error. Return the vp of the created or trunc'd file. 986*fa9e4066Sahrens * 987*fa9e4066Sahrens * IN: dvp - vnode of directory to put new file entry in. 988*fa9e4066Sahrens * name - name of new file entry. 989*fa9e4066Sahrens * vap - attributes of new file. 990*fa9e4066Sahrens * excl - flag indicating exclusive or non-exclusive mode. 991*fa9e4066Sahrens * mode - mode to open file with. 992*fa9e4066Sahrens * cr - credentials of caller. 993*fa9e4066Sahrens * flag - large file flag [UNUSED]. 994*fa9e4066Sahrens * 995*fa9e4066Sahrens * OUT: vpp - vnode of created or trunc'd entry. 996*fa9e4066Sahrens * 997*fa9e4066Sahrens * RETURN: 0 if success 998*fa9e4066Sahrens * error code if failure 999*fa9e4066Sahrens * 1000*fa9e4066Sahrens * Timestamps: 1001*fa9e4066Sahrens * dvp - ctime|mtime updated if new entry created 1002*fa9e4066Sahrens * vp - ctime|mtime always, atime if new 1003*fa9e4066Sahrens */ 1004*fa9e4066Sahrens /* ARGSUSED */ 1005*fa9e4066Sahrens static int 1006*fa9e4066Sahrens zfs_create(vnode_t *dvp, char *name, vattr_t *vap, vcexcl_t excl, 1007*fa9e4066Sahrens int mode, vnode_t **vpp, cred_t *cr, int flag) 1008*fa9e4066Sahrens { 1009*fa9e4066Sahrens znode_t *zp, *dzp = VTOZ(dvp); 1010*fa9e4066Sahrens zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 1011*fa9e4066Sahrens zilog_t *zilog = zfsvfs->z_log; 1012*fa9e4066Sahrens uint64_t seq = 0; 1013*fa9e4066Sahrens objset_t *os = zfsvfs->z_os; 1014*fa9e4066Sahrens zfs_dirlock_t *dl; 1015*fa9e4066Sahrens dmu_tx_t *tx; 1016*fa9e4066Sahrens int error; 1017*fa9e4066Sahrens uint64_t zoid; 1018*fa9e4066Sahrens 1019*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 1020*fa9e4066Sahrens 1021*fa9e4066Sahrens top: 1022*fa9e4066Sahrens *vpp = NULL; 1023*fa9e4066Sahrens 1024*fa9e4066Sahrens if ((vap->va_mode & VSVTX) && secpolicy_vnode_stky_modify(cr)) 1025*fa9e4066Sahrens vap->va_mode &= ~VSVTX; 1026*fa9e4066Sahrens 1027*fa9e4066Sahrens if (*name == '\0') { 1028*fa9e4066Sahrens /* 1029*fa9e4066Sahrens * Null component name refers to the directory itself. 1030*fa9e4066Sahrens */ 1031*fa9e4066Sahrens VN_HOLD(dvp); 1032*fa9e4066Sahrens zp = dzp; 1033*fa9e4066Sahrens dl = NULL; 1034*fa9e4066Sahrens error = 0; 1035*fa9e4066Sahrens } else { 1036*fa9e4066Sahrens /* possible VN_HOLD(zp) */ 1037*fa9e4066Sahrens if (error = zfs_dirent_lock(&dl, dzp, name, &zp, 0)) { 1038*fa9e4066Sahrens if (strcmp(name, "..") == 0) 1039*fa9e4066Sahrens error = EISDIR; 1040*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1041*fa9e4066Sahrens return (error); 1042*fa9e4066Sahrens } 1043*fa9e4066Sahrens } 1044*fa9e4066Sahrens 1045*fa9e4066Sahrens zoid = zp ? zp->z_id : -1ULL; 1046*fa9e4066Sahrens 1047*fa9e4066Sahrens if (zp == NULL) { 1048*fa9e4066Sahrens /* 1049*fa9e4066Sahrens * Create a new file object and update the directory 1050*fa9e4066Sahrens * to reference it. 1051*fa9e4066Sahrens */ 1052*fa9e4066Sahrens if (error = zfs_zaccess(dzp, ACE_ADD_FILE, cr)) { 1053*fa9e4066Sahrens goto out; 1054*fa9e4066Sahrens } 1055*fa9e4066Sahrens 1056*fa9e4066Sahrens /* 1057*fa9e4066Sahrens * We only support the creation of regular files in 1058*fa9e4066Sahrens * extended attribute directories. 1059*fa9e4066Sahrens */ 1060*fa9e4066Sahrens if ((dzp->z_phys->zp_flags & ZFS_XATTR) && 1061*fa9e4066Sahrens (vap->va_type != VREG)) { 1062*fa9e4066Sahrens error = EINVAL; 1063*fa9e4066Sahrens goto out; 1064*fa9e4066Sahrens } 1065*fa9e4066Sahrens 1066*fa9e4066Sahrens tx = dmu_tx_create(os); 1067*fa9e4066Sahrens dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT); 1068*fa9e4066Sahrens dmu_tx_hold_bonus(tx, dzp->z_id); 1069*fa9e4066Sahrens dmu_tx_hold_zap(tx, dzp->z_id, 1); 1070*fa9e4066Sahrens if (dzp->z_phys->zp_flags & ZFS_INHERIT_ACE) 1071*fa9e4066Sahrens dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 1072*fa9e4066Sahrens 0, SPA_MAXBLOCKSIZE); 1073*fa9e4066Sahrens error = dmu_tx_assign(tx, zfsvfs->z_assign); 1074*fa9e4066Sahrens if (error) { 1075*fa9e4066Sahrens dmu_tx_abort(tx); 1076*fa9e4066Sahrens zfs_dirent_unlock(dl); 1077*fa9e4066Sahrens if (error == ERESTART && 1078*fa9e4066Sahrens zfsvfs->z_assign == TXG_NOWAIT) { 1079*fa9e4066Sahrens txg_wait_open(dmu_objset_pool(os), 0); 1080*fa9e4066Sahrens goto top; 1081*fa9e4066Sahrens } 1082*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1083*fa9e4066Sahrens return (error); 1084*fa9e4066Sahrens } 1085*fa9e4066Sahrens zfs_mknode(dzp, vap, &zoid, tx, cr, 0, &zp, 0); 1086*fa9e4066Sahrens ASSERT(zp->z_id == zoid); 1087*fa9e4066Sahrens (void) zfs_link_create(dl, zp, tx, ZNEW); 1088*fa9e4066Sahrens seq = zfs_log_create(zilog, tx, TX_CREATE, dzp, zp, name); 1089*fa9e4066Sahrens dmu_tx_commit(tx); 1090*fa9e4066Sahrens } else { 1091*fa9e4066Sahrens /* 1092*fa9e4066Sahrens * A directory entry already exists for this name. 1093*fa9e4066Sahrens */ 1094*fa9e4066Sahrens /* 1095*fa9e4066Sahrens * Can't truncate an existing file if in exclusive mode. 1096*fa9e4066Sahrens */ 1097*fa9e4066Sahrens if (excl == EXCL) { 1098*fa9e4066Sahrens error = EEXIST; 1099*fa9e4066Sahrens goto out; 1100*fa9e4066Sahrens } 1101*fa9e4066Sahrens /* 1102*fa9e4066Sahrens * Can't open a directory for writing. 1103*fa9e4066Sahrens */ 1104*fa9e4066Sahrens if ((ZTOV(zp)->v_type == VDIR) && (mode & S_IWRITE)) { 1105*fa9e4066Sahrens error = EISDIR; 1106*fa9e4066Sahrens goto out; 1107*fa9e4066Sahrens } 1108*fa9e4066Sahrens /* 1109*fa9e4066Sahrens * Verify requested access to file. 1110*fa9e4066Sahrens */ 1111*fa9e4066Sahrens if (mode && (error = zfs_zaccess_rwx(zp, mode, cr))) { 1112*fa9e4066Sahrens goto out; 1113*fa9e4066Sahrens } 1114*fa9e4066Sahrens /* 1115*fa9e4066Sahrens * Truncate regular files if requested. 1116*fa9e4066Sahrens */ 1117*fa9e4066Sahrens 1118*fa9e4066Sahrens /* 1119*fa9e4066Sahrens * Need to update dzp->z_seq? 1120*fa9e4066Sahrens */ 1121*fa9e4066Sahrens 1122*fa9e4066Sahrens mutex_enter(&dzp->z_lock); 1123*fa9e4066Sahrens dzp->z_seq++; 1124*fa9e4066Sahrens mutex_exit(&dzp->z_lock); 1125*fa9e4066Sahrens 1126*fa9e4066Sahrens if ((ZTOV(zp)->v_type == VREG) && (zp->z_phys->zp_size != 0) && 1127*fa9e4066Sahrens (vap->va_mask & AT_SIZE) && (vap->va_size == 0)) { 1128*fa9e4066Sahrens /* 1129*fa9e4066Sahrens * Truncate the file. 1130*fa9e4066Sahrens */ 1131*fa9e4066Sahrens tx = dmu_tx_create(os); 1132*fa9e4066Sahrens dmu_tx_hold_bonus(tx, zoid); 1133*fa9e4066Sahrens dmu_tx_hold_free(tx, zoid, 0, DMU_OBJECT_END); 1134*fa9e4066Sahrens error = dmu_tx_assign(tx, zfsvfs->z_assign); 1135*fa9e4066Sahrens if (error) { 1136*fa9e4066Sahrens dmu_tx_abort(tx); 1137*fa9e4066Sahrens if (dl) 1138*fa9e4066Sahrens zfs_dirent_unlock(dl); 1139*fa9e4066Sahrens VN_RELE(ZTOV(zp)); 1140*fa9e4066Sahrens if (error == ERESTART && 1141*fa9e4066Sahrens zfsvfs->z_assign == TXG_NOWAIT) { 1142*fa9e4066Sahrens txg_wait_open(dmu_objset_pool(os), 0); 1143*fa9e4066Sahrens goto top; 1144*fa9e4066Sahrens } 1145*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1146*fa9e4066Sahrens return (error); 1147*fa9e4066Sahrens } 1148*fa9e4066Sahrens /* 1149*fa9e4066Sahrens * Grab the grow_lock to serialize this change with 1150*fa9e4066Sahrens * respect to other file manipulations. 1151*fa9e4066Sahrens */ 1152*fa9e4066Sahrens rw_enter(&zp->z_grow_lock, RW_WRITER); 1153*fa9e4066Sahrens error = zfs_freesp(zp, 0, 0, mode, tx, cr); 1154*fa9e4066Sahrens if (error == 0) { 1155*fa9e4066Sahrens zfs_time_stamper(zp, CONTENT_MODIFIED, tx); 1156*fa9e4066Sahrens seq = zfs_log_truncate(zilog, tx, 1157*fa9e4066Sahrens TX_TRUNCATE, zp, 0, 0); 1158*fa9e4066Sahrens } 1159*fa9e4066Sahrens rw_exit(&zp->z_grow_lock); 1160*fa9e4066Sahrens dmu_tx_commit(tx); 1161*fa9e4066Sahrens } 1162*fa9e4066Sahrens } 1163*fa9e4066Sahrens out: 1164*fa9e4066Sahrens 1165*fa9e4066Sahrens if (dl) 1166*fa9e4066Sahrens zfs_dirent_unlock(dl); 1167*fa9e4066Sahrens 1168*fa9e4066Sahrens if (error) { 1169*fa9e4066Sahrens if (zp) 1170*fa9e4066Sahrens VN_RELE(ZTOV(zp)); 1171*fa9e4066Sahrens } else { 1172*fa9e4066Sahrens *vpp = ZTOV(zp); 1173*fa9e4066Sahrens /* 1174*fa9e4066Sahrens * If vnode is for a device return a specfs vnode instead. 1175*fa9e4066Sahrens */ 1176*fa9e4066Sahrens if (IS_DEVVP(*vpp)) { 1177*fa9e4066Sahrens struct vnode *svp; 1178*fa9e4066Sahrens 1179*fa9e4066Sahrens svp = specvp(*vpp, (*vpp)->v_rdev, (*vpp)->v_type, cr); 1180*fa9e4066Sahrens VN_RELE(*vpp); 1181*fa9e4066Sahrens if (svp == NULL) { 1182*fa9e4066Sahrens error = ENOSYS; 1183*fa9e4066Sahrens } 1184*fa9e4066Sahrens *vpp = svp; 1185*fa9e4066Sahrens } 1186*fa9e4066Sahrens } 1187*fa9e4066Sahrens 1188*fa9e4066Sahrens zil_commit(zilog, seq, 0); 1189*fa9e4066Sahrens 1190*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1191*fa9e4066Sahrens return (error); 1192*fa9e4066Sahrens } 1193*fa9e4066Sahrens 1194*fa9e4066Sahrens /* 1195*fa9e4066Sahrens * Remove an entry from a directory. 1196*fa9e4066Sahrens * 1197*fa9e4066Sahrens * IN: dvp - vnode of directory to remove entry from. 1198*fa9e4066Sahrens * name - name of entry to remove. 1199*fa9e4066Sahrens * cr - credentials of caller. 1200*fa9e4066Sahrens * 1201*fa9e4066Sahrens * RETURN: 0 if success 1202*fa9e4066Sahrens * error code if failure 1203*fa9e4066Sahrens * 1204*fa9e4066Sahrens * Timestamps: 1205*fa9e4066Sahrens * dvp - ctime|mtime 1206*fa9e4066Sahrens * vp - ctime (if nlink > 0) 1207*fa9e4066Sahrens */ 1208*fa9e4066Sahrens static int 1209*fa9e4066Sahrens zfs_remove(vnode_t *dvp, char *name, cred_t *cr) 1210*fa9e4066Sahrens { 1211*fa9e4066Sahrens znode_t *zp, *dzp = VTOZ(dvp); 1212*fa9e4066Sahrens znode_t *xzp = NULL; 1213*fa9e4066Sahrens vnode_t *vp; 1214*fa9e4066Sahrens zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 1215*fa9e4066Sahrens zilog_t *zilog = zfsvfs->z_log; 1216*fa9e4066Sahrens uint64_t seq = 0; 1217*fa9e4066Sahrens uint64_t acl_obj, xattr_obj; 1218*fa9e4066Sahrens zfs_dirlock_t *dl; 1219*fa9e4066Sahrens dmu_tx_t *tx; 1220*fa9e4066Sahrens int may_delete_now, delete_now = FALSE; 1221*fa9e4066Sahrens int reaped; 1222*fa9e4066Sahrens int error; 1223*fa9e4066Sahrens 1224*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 1225*fa9e4066Sahrens 1226*fa9e4066Sahrens top: 1227*fa9e4066Sahrens /* 1228*fa9e4066Sahrens * Attempt to lock directory; fail if entry doesn't exist. 1229*fa9e4066Sahrens */ 1230*fa9e4066Sahrens if (error = zfs_dirent_lock(&dl, dzp, name, &zp, ZEXISTS)) { 1231*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1232*fa9e4066Sahrens return (error); 1233*fa9e4066Sahrens } 1234*fa9e4066Sahrens 1235*fa9e4066Sahrens vp = ZTOV(zp); 1236*fa9e4066Sahrens 1237*fa9e4066Sahrens if (error = zfs_zaccess_delete(dzp, zp, cr)) { 1238*fa9e4066Sahrens goto out; 1239*fa9e4066Sahrens } 1240*fa9e4066Sahrens 1241*fa9e4066Sahrens /* 1242*fa9e4066Sahrens * Check the restrictions that apply on sticky directories. 1243*fa9e4066Sahrens */ 1244*fa9e4066Sahrens if (error = zfs_sticky_remove_access(dzp, zp, cr)) 1245*fa9e4066Sahrens goto out; 1246*fa9e4066Sahrens 1247*fa9e4066Sahrens /* 1248*fa9e4066Sahrens * Need to use rmdir for removing directories. 1249*fa9e4066Sahrens */ 1250*fa9e4066Sahrens if (vp->v_type == VDIR) { 1251*fa9e4066Sahrens error = EPERM; 1252*fa9e4066Sahrens goto out; 1253*fa9e4066Sahrens } 1254*fa9e4066Sahrens 1255*fa9e4066Sahrens vnevent_remove(vp); 1256*fa9e4066Sahrens 1257*fa9e4066Sahrens mutex_enter(&vp->v_lock); 1258*fa9e4066Sahrens may_delete_now = vp->v_count == 1 && !vn_has_cached_data(vp); 1259*fa9e4066Sahrens mutex_exit(&vp->v_lock); 1260*fa9e4066Sahrens 1261*fa9e4066Sahrens /* 1262*fa9e4066Sahrens * We may delete the znode now, or we may put it on the delete queue; 1263*fa9e4066Sahrens * it depends on whether we're the last link, and on whether there are 1264*fa9e4066Sahrens * other holds on the vnode. So we dmu_tx_hold() the right things to 1265*fa9e4066Sahrens * allow for either case. 1266*fa9e4066Sahrens */ 1267*fa9e4066Sahrens tx = dmu_tx_create(zfsvfs->z_os); 1268*fa9e4066Sahrens dmu_tx_hold_zap(tx, dzp->z_id, -1); 1269*fa9e4066Sahrens dmu_tx_hold_bonus(tx, zp->z_id); 1270*fa9e4066Sahrens if (may_delete_now) 1271*fa9e4066Sahrens dmu_tx_hold_free(tx, zp->z_id, 0, DMU_OBJECT_END); 1272*fa9e4066Sahrens 1273*fa9e4066Sahrens /* are there any extended attributes? */ 1274*fa9e4066Sahrens if ((xattr_obj = zp->z_phys->zp_xattr) != 0) { 1275*fa9e4066Sahrens /* 1276*fa9e4066Sahrens * XXX - There is a possibility that the delete 1277*fa9e4066Sahrens * of the parent file could succeed, but then we get 1278*fa9e4066Sahrens * an ENOSPC when we try to delete the xattrs... 1279*fa9e4066Sahrens * so we would need to re-try the deletes periodically 1280*fa9e4066Sahrens */ 1281*fa9e4066Sahrens /* XXX - do we need this if we are deleting? */ 1282*fa9e4066Sahrens dmu_tx_hold_bonus(tx, xattr_obj); 1283*fa9e4066Sahrens } 1284*fa9e4066Sahrens 1285*fa9e4066Sahrens /* are there any additional acls */ 1286*fa9e4066Sahrens if ((acl_obj = zp->z_phys->zp_acl.z_acl_extern_obj) != 0 && 1287*fa9e4066Sahrens may_delete_now) 1288*fa9e4066Sahrens dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END); 1289*fa9e4066Sahrens 1290*fa9e4066Sahrens /* charge as an update -- would be nice not to charge at all */ 1291*fa9e4066Sahrens dmu_tx_hold_zap(tx, zfsvfs->z_dqueue, -1); 1292*fa9e4066Sahrens 1293*fa9e4066Sahrens error = dmu_tx_assign(tx, zfsvfs->z_assign); 1294*fa9e4066Sahrens if (error) { 1295*fa9e4066Sahrens dmu_tx_abort(tx); 1296*fa9e4066Sahrens zfs_dirent_unlock(dl); 1297*fa9e4066Sahrens VN_RELE(vp); 1298*fa9e4066Sahrens if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { 1299*fa9e4066Sahrens txg_wait_open(dmu_objset_pool(zfsvfs->z_os), 0); 1300*fa9e4066Sahrens goto top; 1301*fa9e4066Sahrens } 1302*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1303*fa9e4066Sahrens return (error); 1304*fa9e4066Sahrens } 1305*fa9e4066Sahrens 1306*fa9e4066Sahrens /* 1307*fa9e4066Sahrens * Remove the directory entry. 1308*fa9e4066Sahrens */ 1309*fa9e4066Sahrens error = zfs_link_destroy(dl, zp, tx, 0, &reaped); 1310*fa9e4066Sahrens 1311*fa9e4066Sahrens if (error) { 1312*fa9e4066Sahrens dmu_tx_commit(tx); 1313*fa9e4066Sahrens goto out; 1314*fa9e4066Sahrens } 1315*fa9e4066Sahrens 1316*fa9e4066Sahrens if (reaped) { 1317*fa9e4066Sahrens mutex_enter(&vp->v_lock); 1318*fa9e4066Sahrens delete_now = may_delete_now && 1319*fa9e4066Sahrens vp->v_count == 1 && !vn_has_cached_data(vp) && 1320*fa9e4066Sahrens zp->z_phys->zp_xattr == xattr_obj && 1321*fa9e4066Sahrens zp->z_phys->zp_acl.z_acl_extern_obj == acl_obj; 1322*fa9e4066Sahrens mutex_exit(&vp->v_lock); 1323*fa9e4066Sahrens } 1324*fa9e4066Sahrens 1325*fa9e4066Sahrens if (delete_now) { 1326*fa9e4066Sahrens if (zp->z_phys->zp_xattr) { 1327*fa9e4066Sahrens error = zfs_zget(zfsvfs, zp->z_phys->zp_xattr, &xzp); 1328*fa9e4066Sahrens ASSERT3U(error, ==, 0); 1329*fa9e4066Sahrens ASSERT3U(xzp->z_phys->zp_links, ==, 2); 1330*fa9e4066Sahrens dmu_buf_will_dirty(xzp->z_dbuf, tx); 1331*fa9e4066Sahrens mutex_enter(&xzp->z_lock); 1332*fa9e4066Sahrens xzp->z_reap = 1; 1333*fa9e4066Sahrens xzp->z_phys->zp_links = 0; 1334*fa9e4066Sahrens mutex_exit(&xzp->z_lock); 1335*fa9e4066Sahrens zfs_dq_add(xzp, tx); 1336*fa9e4066Sahrens zp->z_phys->zp_xattr = 0; /* probably unnecessary */ 1337*fa9e4066Sahrens } 1338*fa9e4066Sahrens mutex_enter(&zp->z_lock); 1339*fa9e4066Sahrens mutex_enter(&vp->v_lock); 1340*fa9e4066Sahrens vp->v_count--; 1341*fa9e4066Sahrens ASSERT3U(vp->v_count, ==, 0); 1342*fa9e4066Sahrens mutex_exit(&vp->v_lock); 1343*fa9e4066Sahrens zp->z_active = 0; 1344*fa9e4066Sahrens mutex_exit(&zp->z_lock); 1345*fa9e4066Sahrens zfs_znode_delete(zp, tx); 1346*fa9e4066Sahrens VFS_RELE(zfsvfs->z_vfs); 1347*fa9e4066Sahrens } else if (reaped) { 1348*fa9e4066Sahrens zfs_dq_add(zp, tx); 1349*fa9e4066Sahrens } 1350*fa9e4066Sahrens 1351*fa9e4066Sahrens seq = zfs_log_remove(zilog, tx, TX_REMOVE, dzp, name); 1352*fa9e4066Sahrens 1353*fa9e4066Sahrens dmu_tx_commit(tx); 1354*fa9e4066Sahrens out: 1355*fa9e4066Sahrens zfs_dirent_unlock(dl); 1356*fa9e4066Sahrens 1357*fa9e4066Sahrens if (!delete_now) { 1358*fa9e4066Sahrens VN_RELE(vp); 1359*fa9e4066Sahrens } else if (xzp) { 1360*fa9e4066Sahrens /* this rele delayed to prevent nesting transactions */ 1361*fa9e4066Sahrens VN_RELE(ZTOV(xzp)); 1362*fa9e4066Sahrens } 1363*fa9e4066Sahrens 1364*fa9e4066Sahrens zil_commit(zilog, seq, 0); 1365*fa9e4066Sahrens 1366*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1367*fa9e4066Sahrens return (error); 1368*fa9e4066Sahrens } 1369*fa9e4066Sahrens 1370*fa9e4066Sahrens /* 1371*fa9e4066Sahrens * Create a new directory and insert it into dvp using the name 1372*fa9e4066Sahrens * provided. Return a pointer to the inserted directory. 1373*fa9e4066Sahrens * 1374*fa9e4066Sahrens * IN: dvp - vnode of directory to add subdir to. 1375*fa9e4066Sahrens * dirname - name of new directory. 1376*fa9e4066Sahrens * vap - attributes of new directory. 1377*fa9e4066Sahrens * cr - credentials of caller. 1378*fa9e4066Sahrens * 1379*fa9e4066Sahrens * OUT: vpp - vnode of created directory. 1380*fa9e4066Sahrens * 1381*fa9e4066Sahrens * RETURN: 0 if success 1382*fa9e4066Sahrens * error code if failure 1383*fa9e4066Sahrens * 1384*fa9e4066Sahrens * Timestamps: 1385*fa9e4066Sahrens * dvp - ctime|mtime updated 1386*fa9e4066Sahrens * vp - ctime|mtime|atime updated 1387*fa9e4066Sahrens */ 1388*fa9e4066Sahrens static int 1389*fa9e4066Sahrens zfs_mkdir(vnode_t *dvp, char *dirname, vattr_t *vap, vnode_t **vpp, cred_t *cr) 1390*fa9e4066Sahrens { 1391*fa9e4066Sahrens znode_t *zp, *dzp = VTOZ(dvp); 1392*fa9e4066Sahrens zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 1393*fa9e4066Sahrens zilog_t *zilog = zfsvfs->z_log; 1394*fa9e4066Sahrens uint64_t seq = 0; 1395*fa9e4066Sahrens zfs_dirlock_t *dl; 1396*fa9e4066Sahrens uint64_t zoid = 0; 1397*fa9e4066Sahrens dmu_tx_t *tx; 1398*fa9e4066Sahrens int error; 1399*fa9e4066Sahrens 1400*fa9e4066Sahrens ASSERT(vap->va_type == VDIR); 1401*fa9e4066Sahrens 1402*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 1403*fa9e4066Sahrens 1404*fa9e4066Sahrens if (dzp->z_phys->zp_flags & ZFS_XATTR) { 1405*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1406*fa9e4066Sahrens return (EINVAL); 1407*fa9e4066Sahrens } 1408*fa9e4066Sahrens top: 1409*fa9e4066Sahrens *vpp = NULL; 1410*fa9e4066Sahrens if (error = zfs_zaccess(dzp, ACE_ADD_SUBDIRECTORY, cr)) { 1411*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1412*fa9e4066Sahrens return (error); 1413*fa9e4066Sahrens } 1414*fa9e4066Sahrens 1415*fa9e4066Sahrens /* 1416*fa9e4066Sahrens * First make sure the new directory doesn't exist. 1417*fa9e4066Sahrens */ 1418*fa9e4066Sahrens if (error = zfs_dirent_lock(&dl, dzp, dirname, &zp, ZNEW)) { 1419*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1420*fa9e4066Sahrens return (error); 1421*fa9e4066Sahrens } 1422*fa9e4066Sahrens 1423*fa9e4066Sahrens /* 1424*fa9e4066Sahrens * Add a new entry to the directory. 1425*fa9e4066Sahrens */ 1426*fa9e4066Sahrens tx = dmu_tx_create(zfsvfs->z_os); 1427*fa9e4066Sahrens dmu_tx_hold_zap(tx, dzp->z_id, 1); 1428*fa9e4066Sahrens dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, 0); 1429*fa9e4066Sahrens if (dzp->z_phys->zp_flags & ZFS_INHERIT_ACE) 1430*fa9e4066Sahrens dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 1431*fa9e4066Sahrens 0, SPA_MAXBLOCKSIZE); 1432*fa9e4066Sahrens error = dmu_tx_assign(tx, zfsvfs->z_assign); 1433*fa9e4066Sahrens if (error) { 1434*fa9e4066Sahrens dmu_tx_abort(tx); 1435*fa9e4066Sahrens zfs_dirent_unlock(dl); 1436*fa9e4066Sahrens if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { 1437*fa9e4066Sahrens txg_wait_open(dmu_objset_pool(zfsvfs->z_os), 0); 1438*fa9e4066Sahrens goto top; 1439*fa9e4066Sahrens } 1440*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1441*fa9e4066Sahrens return (error); 1442*fa9e4066Sahrens } 1443*fa9e4066Sahrens 1444*fa9e4066Sahrens /* 1445*fa9e4066Sahrens * Create new node. 1446*fa9e4066Sahrens */ 1447*fa9e4066Sahrens zfs_mknode(dzp, vap, &zoid, tx, cr, 0, &zp, 0); 1448*fa9e4066Sahrens 1449*fa9e4066Sahrens /* 1450*fa9e4066Sahrens * Now put new name in parent dir. 1451*fa9e4066Sahrens */ 1452*fa9e4066Sahrens (void) zfs_link_create(dl, zp, tx, ZNEW); 1453*fa9e4066Sahrens 1454*fa9e4066Sahrens *vpp = ZTOV(zp); 1455*fa9e4066Sahrens 1456*fa9e4066Sahrens seq = zfs_log_create(zilog, tx, TX_MKDIR, dzp, zp, dirname); 1457*fa9e4066Sahrens dmu_tx_commit(tx); 1458*fa9e4066Sahrens 1459*fa9e4066Sahrens zfs_dirent_unlock(dl); 1460*fa9e4066Sahrens 1461*fa9e4066Sahrens zil_commit(zilog, seq, 0); 1462*fa9e4066Sahrens 1463*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1464*fa9e4066Sahrens return (0); 1465*fa9e4066Sahrens } 1466*fa9e4066Sahrens 1467*fa9e4066Sahrens /* 1468*fa9e4066Sahrens * Remove a directory subdir entry. If the current working 1469*fa9e4066Sahrens * directory is the same as the subdir to be removed, the 1470*fa9e4066Sahrens * remove will fail. 1471*fa9e4066Sahrens * 1472*fa9e4066Sahrens * IN: dvp - vnode of directory to remove from. 1473*fa9e4066Sahrens * name - name of directory to be removed. 1474*fa9e4066Sahrens * cwd - vnode of current working directory. 1475*fa9e4066Sahrens * cr - credentials of caller. 1476*fa9e4066Sahrens * 1477*fa9e4066Sahrens * RETURN: 0 if success 1478*fa9e4066Sahrens * error code if failure 1479*fa9e4066Sahrens * 1480*fa9e4066Sahrens * Timestamps: 1481*fa9e4066Sahrens * dvp - ctime|mtime updated 1482*fa9e4066Sahrens */ 1483*fa9e4066Sahrens static int 1484*fa9e4066Sahrens zfs_rmdir(vnode_t *dvp, char *name, vnode_t *cwd, cred_t *cr) 1485*fa9e4066Sahrens { 1486*fa9e4066Sahrens znode_t *dzp = VTOZ(dvp); 1487*fa9e4066Sahrens znode_t *zp; 1488*fa9e4066Sahrens vnode_t *vp; 1489*fa9e4066Sahrens zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 1490*fa9e4066Sahrens zilog_t *zilog = zfsvfs->z_log; 1491*fa9e4066Sahrens uint64_t seq = 0; 1492*fa9e4066Sahrens zfs_dirlock_t *dl; 1493*fa9e4066Sahrens dmu_tx_t *tx; 1494*fa9e4066Sahrens int error; 1495*fa9e4066Sahrens 1496*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 1497*fa9e4066Sahrens 1498*fa9e4066Sahrens top: 1499*fa9e4066Sahrens zp = NULL; 1500*fa9e4066Sahrens 1501*fa9e4066Sahrens /* 1502*fa9e4066Sahrens * Attempt to lock directory; fail if entry doesn't exist. 1503*fa9e4066Sahrens */ 1504*fa9e4066Sahrens if (error = zfs_dirent_lock(&dl, dzp, name, &zp, ZEXISTS)) { 1505*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1506*fa9e4066Sahrens return (error); 1507*fa9e4066Sahrens } 1508*fa9e4066Sahrens 1509*fa9e4066Sahrens vp = ZTOV(zp); 1510*fa9e4066Sahrens 1511*fa9e4066Sahrens if (error = zfs_zaccess_delete(dzp, zp, cr)) { 1512*fa9e4066Sahrens goto out; 1513*fa9e4066Sahrens } 1514*fa9e4066Sahrens 1515*fa9e4066Sahrens /* 1516*fa9e4066Sahrens * Check the restrictions that apply on sticky directories. 1517*fa9e4066Sahrens */ 1518*fa9e4066Sahrens if (error = zfs_sticky_remove_access(dzp, zp, cr)) 1519*fa9e4066Sahrens goto out; 1520*fa9e4066Sahrens 1521*fa9e4066Sahrens if (vp->v_type != VDIR) { 1522*fa9e4066Sahrens error = ENOTDIR; 1523*fa9e4066Sahrens goto out; 1524*fa9e4066Sahrens } 1525*fa9e4066Sahrens 1526*fa9e4066Sahrens if (vp == cwd) { 1527*fa9e4066Sahrens error = EINVAL; 1528*fa9e4066Sahrens goto out; 1529*fa9e4066Sahrens } 1530*fa9e4066Sahrens 1531*fa9e4066Sahrens vnevent_rmdir(vp); 1532*fa9e4066Sahrens 1533*fa9e4066Sahrens /* 1534*fa9e4066Sahrens * Grab a lock on the parent pointer make sure we play well 1535*fa9e4066Sahrens * with the treewalk and directory rename code. 1536*fa9e4066Sahrens */ 1537*fa9e4066Sahrens rw_enter(&zp->z_parent_lock, RW_WRITER); 1538*fa9e4066Sahrens 1539*fa9e4066Sahrens tx = dmu_tx_create(zfsvfs->z_os); 1540*fa9e4066Sahrens dmu_tx_hold_zap(tx, dzp->z_id, 1); 1541*fa9e4066Sahrens dmu_tx_hold_bonus(tx, zp->z_id); 1542*fa9e4066Sahrens dmu_tx_hold_zap(tx, zfsvfs->z_dqueue, 1); 1543*fa9e4066Sahrens error = dmu_tx_assign(tx, zfsvfs->z_assign); 1544*fa9e4066Sahrens if (error) { 1545*fa9e4066Sahrens dmu_tx_abort(tx); 1546*fa9e4066Sahrens rw_exit(&zp->z_parent_lock); 1547*fa9e4066Sahrens zfs_dirent_unlock(dl); 1548*fa9e4066Sahrens VN_RELE(vp); 1549*fa9e4066Sahrens if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { 1550*fa9e4066Sahrens txg_wait_open(dmu_objset_pool(zfsvfs->z_os), 0); 1551*fa9e4066Sahrens goto top; 1552*fa9e4066Sahrens } 1553*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1554*fa9e4066Sahrens return (error); 1555*fa9e4066Sahrens } 1556*fa9e4066Sahrens 1557*fa9e4066Sahrens error = zfs_link_destroy(dl, zp, tx, 0, NULL); 1558*fa9e4066Sahrens 1559*fa9e4066Sahrens if (error == 0) 1560*fa9e4066Sahrens seq = zfs_log_remove(zilog, tx, TX_RMDIR, dzp, name); 1561*fa9e4066Sahrens 1562*fa9e4066Sahrens dmu_tx_commit(tx); 1563*fa9e4066Sahrens 1564*fa9e4066Sahrens rw_exit(&zp->z_parent_lock); 1565*fa9e4066Sahrens out: 1566*fa9e4066Sahrens zfs_dirent_unlock(dl); 1567*fa9e4066Sahrens 1568*fa9e4066Sahrens VN_RELE(vp); 1569*fa9e4066Sahrens 1570*fa9e4066Sahrens zil_commit(zilog, seq, 0); 1571*fa9e4066Sahrens 1572*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1573*fa9e4066Sahrens return (error); 1574*fa9e4066Sahrens } 1575*fa9e4066Sahrens 1576*fa9e4066Sahrens /* 1577*fa9e4066Sahrens * Read as many directory entries as will fit into the provided 1578*fa9e4066Sahrens * buffer from the given directory cursor position (specified in 1579*fa9e4066Sahrens * the uio structure. 1580*fa9e4066Sahrens * 1581*fa9e4066Sahrens * IN: vp - vnode of directory to read. 1582*fa9e4066Sahrens * uio - structure supplying read location, range info, 1583*fa9e4066Sahrens * and return buffer. 1584*fa9e4066Sahrens * cr - credentials of caller. 1585*fa9e4066Sahrens * 1586*fa9e4066Sahrens * OUT: uio - updated offset and range, buffer filled. 1587*fa9e4066Sahrens * eofp - set to true if end-of-file detected. 1588*fa9e4066Sahrens * 1589*fa9e4066Sahrens * RETURN: 0 if success 1590*fa9e4066Sahrens * error code if failure 1591*fa9e4066Sahrens * 1592*fa9e4066Sahrens * Timestamps: 1593*fa9e4066Sahrens * vp - atime updated 1594*fa9e4066Sahrens * 1595*fa9e4066Sahrens * Note that the low 4 bits of the cookie returned by zap is always zero. 1596*fa9e4066Sahrens * This allows us to use the low range for "special" directory entries: 1597*fa9e4066Sahrens * We use 0 for '.', and 1 for '..'. If this is the root of the filesystem, 1598*fa9e4066Sahrens * we use the offset 2 for the '.zfs' directory. 1599*fa9e4066Sahrens */ 1600*fa9e4066Sahrens /* ARGSUSED */ 1601*fa9e4066Sahrens static int 1602*fa9e4066Sahrens zfs_readdir(vnode_t *vp, uio_t *uio, cred_t *cr, int *eofp) 1603*fa9e4066Sahrens { 1604*fa9e4066Sahrens znode_t *zp = VTOZ(vp); 1605*fa9e4066Sahrens iovec_t *iovp; 1606*fa9e4066Sahrens dirent64_t *odp; 1607*fa9e4066Sahrens zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1608*fa9e4066Sahrens caddr_t outbuf; 1609*fa9e4066Sahrens size_t bufsize; 1610*fa9e4066Sahrens zap_cursor_t zc; 1611*fa9e4066Sahrens zap_attribute_t zap; 1612*fa9e4066Sahrens uint_t bytes_wanted; 1613*fa9e4066Sahrens ushort_t this_reclen; 1614*fa9e4066Sahrens uint64_t offset; /* must be unsigned; checks for < 1 */ 1615*fa9e4066Sahrens off64_t *next; 1616*fa9e4066Sahrens int local_eof; 1617*fa9e4066Sahrens int outcount = 0; 1618*fa9e4066Sahrens int error = 0; 1619*fa9e4066Sahrens 1620*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 1621*fa9e4066Sahrens 1622*fa9e4066Sahrens /* 1623*fa9e4066Sahrens * If we are not given an eof variable, 1624*fa9e4066Sahrens * use a local one. 1625*fa9e4066Sahrens */ 1626*fa9e4066Sahrens if (eofp == NULL) 1627*fa9e4066Sahrens eofp = &local_eof; 1628*fa9e4066Sahrens 1629*fa9e4066Sahrens /* 1630*fa9e4066Sahrens * Check for valid iov_len. 1631*fa9e4066Sahrens */ 1632*fa9e4066Sahrens if (uio->uio_iov->iov_len <= 0) { 1633*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1634*fa9e4066Sahrens return (EINVAL); 1635*fa9e4066Sahrens } 1636*fa9e4066Sahrens 1637*fa9e4066Sahrens /* 1638*fa9e4066Sahrens * Quit if directory has been removed (posix) 1639*fa9e4066Sahrens */ 1640*fa9e4066Sahrens if ((*eofp = zp->z_reap) != 0) { 1641*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1642*fa9e4066Sahrens return (0); 1643*fa9e4066Sahrens } 1644*fa9e4066Sahrens 1645*fa9e4066Sahrens /* 1646*fa9e4066Sahrens * Initialize the iterator cursor. 1647*fa9e4066Sahrens */ 1648*fa9e4066Sahrens offset = uio->uio_loffset; 1649*fa9e4066Sahrens if (offset <= 3) { 1650*fa9e4066Sahrens /* 1651*fa9e4066Sahrens * Start iteration from the beginning of the directory. 1652*fa9e4066Sahrens */ 1653*fa9e4066Sahrens zap_cursor_init(&zc, zfsvfs->z_os, zp->z_id); 1654*fa9e4066Sahrens } else { 1655*fa9e4066Sahrens /* 1656*fa9e4066Sahrens * The offset is a serialized cursor. 1657*fa9e4066Sahrens */ 1658*fa9e4066Sahrens zap_cursor_init_serialized(&zc, zfsvfs->z_os, zp->z_id, 1659*fa9e4066Sahrens offset); 1660*fa9e4066Sahrens } 1661*fa9e4066Sahrens 1662*fa9e4066Sahrens /* 1663*fa9e4066Sahrens * Get space to change directory entries into fs independent format. 1664*fa9e4066Sahrens */ 1665*fa9e4066Sahrens iovp = uio->uio_iov; 1666*fa9e4066Sahrens bytes_wanted = iovp->iov_len; 1667*fa9e4066Sahrens if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1) { 1668*fa9e4066Sahrens bufsize = bytes_wanted; 1669*fa9e4066Sahrens outbuf = kmem_alloc(bufsize, KM_SLEEP); 1670*fa9e4066Sahrens odp = (struct dirent64 *)outbuf; 1671*fa9e4066Sahrens } else { 1672*fa9e4066Sahrens bufsize = bytes_wanted; 1673*fa9e4066Sahrens odp = (struct dirent64 *)iovp->iov_base; 1674*fa9e4066Sahrens } 1675*fa9e4066Sahrens 1676*fa9e4066Sahrens /* 1677*fa9e4066Sahrens * Transform to file-system independent format 1678*fa9e4066Sahrens */ 1679*fa9e4066Sahrens outcount = 0; 1680*fa9e4066Sahrens while (outcount < bytes_wanted) { 1681*fa9e4066Sahrens /* 1682*fa9e4066Sahrens * Special case `.', `..', and `.zfs'. 1683*fa9e4066Sahrens */ 1684*fa9e4066Sahrens if (offset == 0) { 1685*fa9e4066Sahrens (void) strcpy(zap.za_name, "."); 1686*fa9e4066Sahrens zap.za_first_integer = zp->z_id; 1687*fa9e4066Sahrens this_reclen = DIRENT64_RECLEN(1); 1688*fa9e4066Sahrens } else if (offset == 1) { 1689*fa9e4066Sahrens (void) strcpy(zap.za_name, ".."); 1690*fa9e4066Sahrens zap.za_first_integer = zp->z_phys->zp_parent; 1691*fa9e4066Sahrens this_reclen = DIRENT64_RECLEN(2); 1692*fa9e4066Sahrens } else if (offset == 2 && zfs_show_ctldir(zp)) { 1693*fa9e4066Sahrens (void) strcpy(zap.za_name, ZFS_CTLDIR_NAME); 1694*fa9e4066Sahrens zap.za_first_integer = ZFSCTL_INO_ROOT; 1695*fa9e4066Sahrens this_reclen = 1696*fa9e4066Sahrens DIRENT64_RECLEN(sizeof (ZFS_CTLDIR_NAME) - 1); 1697*fa9e4066Sahrens } else { 1698*fa9e4066Sahrens /* 1699*fa9e4066Sahrens * Grab next entry. 1700*fa9e4066Sahrens */ 1701*fa9e4066Sahrens if (error = zap_cursor_retrieve(&zc, &zap)) { 1702*fa9e4066Sahrens if ((*eofp = (error == ENOENT)) != 0) 1703*fa9e4066Sahrens break; 1704*fa9e4066Sahrens else 1705*fa9e4066Sahrens goto update; 1706*fa9e4066Sahrens } 1707*fa9e4066Sahrens 1708*fa9e4066Sahrens if (zap.za_integer_length != 8 || 1709*fa9e4066Sahrens zap.za_num_integers != 1) { 1710*fa9e4066Sahrens cmn_err(CE_WARN, "zap_readdir: bad directory " 1711*fa9e4066Sahrens "entry, obj = %lld, offset = %lld\n", 1712*fa9e4066Sahrens (u_longlong_t)zp->z_id, 1713*fa9e4066Sahrens (u_longlong_t)offset); 1714*fa9e4066Sahrens error = ENXIO; 1715*fa9e4066Sahrens goto update; 1716*fa9e4066Sahrens } 1717*fa9e4066Sahrens this_reclen = DIRENT64_RECLEN(strlen(zap.za_name)); 1718*fa9e4066Sahrens } 1719*fa9e4066Sahrens 1720*fa9e4066Sahrens /* 1721*fa9e4066Sahrens * Will this entry fit in the buffer? 1722*fa9e4066Sahrens */ 1723*fa9e4066Sahrens if (outcount + this_reclen > bufsize) { 1724*fa9e4066Sahrens /* 1725*fa9e4066Sahrens * Did we manage to fit anything in the buffer? 1726*fa9e4066Sahrens */ 1727*fa9e4066Sahrens if (!outcount) { 1728*fa9e4066Sahrens error = EINVAL; 1729*fa9e4066Sahrens goto update; 1730*fa9e4066Sahrens } 1731*fa9e4066Sahrens break; 1732*fa9e4066Sahrens } 1733*fa9e4066Sahrens /* 1734*fa9e4066Sahrens * Add this entry: 1735*fa9e4066Sahrens */ 1736*fa9e4066Sahrens odp->d_ino = (ino64_t)zap.za_first_integer; 1737*fa9e4066Sahrens odp->d_reclen = (ushort_t)this_reclen; 1738*fa9e4066Sahrens /* NOTE: d_off is the offset for the *next* entry */ 1739*fa9e4066Sahrens next = &(odp->d_off); 1740*fa9e4066Sahrens (void) strncpy(odp->d_name, zap.za_name, 1741*fa9e4066Sahrens DIRENT64_NAMELEN(this_reclen)); 1742*fa9e4066Sahrens outcount += this_reclen; 1743*fa9e4066Sahrens odp = (dirent64_t *)((intptr_t)odp + this_reclen); 1744*fa9e4066Sahrens 1745*fa9e4066Sahrens ASSERT(outcount <= bufsize); 1746*fa9e4066Sahrens 1747*fa9e4066Sahrens /* Prefetch znode */ 1748*fa9e4066Sahrens dmu_prefetch(zfsvfs->z_os, zap.za_first_integer, 0, 0); 1749*fa9e4066Sahrens 1750*fa9e4066Sahrens /* 1751*fa9e4066Sahrens * Move to the next entry, fill in the previous offset. 1752*fa9e4066Sahrens */ 1753*fa9e4066Sahrens if (offset > 2 || (offset == 2 && !zfs_show_ctldir(zp))) { 1754*fa9e4066Sahrens zap_cursor_advance(&zc); 1755*fa9e4066Sahrens offset = zap_cursor_serialize(&zc); 1756*fa9e4066Sahrens } else { 1757*fa9e4066Sahrens offset += 1; 1758*fa9e4066Sahrens } 1759*fa9e4066Sahrens *next = offset; 1760*fa9e4066Sahrens } 1761*fa9e4066Sahrens 1762*fa9e4066Sahrens if (uio->uio_segflg == UIO_SYSSPACE && uio->uio_iovcnt == 1) { 1763*fa9e4066Sahrens iovp->iov_base += outcount; 1764*fa9e4066Sahrens iovp->iov_len -= outcount; 1765*fa9e4066Sahrens uio->uio_resid -= outcount; 1766*fa9e4066Sahrens } else if (error = uiomove(outbuf, (long)outcount, UIO_READ, uio)) { 1767*fa9e4066Sahrens /* 1768*fa9e4066Sahrens * Reset the pointer. 1769*fa9e4066Sahrens */ 1770*fa9e4066Sahrens offset = uio->uio_loffset; 1771*fa9e4066Sahrens } 1772*fa9e4066Sahrens 1773*fa9e4066Sahrens update: 1774*fa9e4066Sahrens if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1) 1775*fa9e4066Sahrens kmem_free(outbuf, bufsize); 1776*fa9e4066Sahrens 1777*fa9e4066Sahrens if (error == ENOENT) 1778*fa9e4066Sahrens error = 0; 1779*fa9e4066Sahrens 1780*fa9e4066Sahrens ZFS_ACCESSTIME_STAMP(zfsvfs, zp); 1781*fa9e4066Sahrens 1782*fa9e4066Sahrens uio->uio_loffset = offset; 1783*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1784*fa9e4066Sahrens return (error); 1785*fa9e4066Sahrens } 1786*fa9e4066Sahrens 1787*fa9e4066Sahrens /* ARGSUSED */ 1788*fa9e4066Sahrens static int 1789*fa9e4066Sahrens zfs_fsync(vnode_t *vp, int syncflag, cred_t *cr) 1790*fa9e4066Sahrens { 1791*fa9e4066Sahrens znode_t *zp = VTOZ(vp); 1792*fa9e4066Sahrens zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1793*fa9e4066Sahrens 1794*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 1795*fa9e4066Sahrens zil_commit(zfsvfs->z_log, zp->z_last_itx, FSYNC); 1796*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1797*fa9e4066Sahrens return (0); 1798*fa9e4066Sahrens } 1799*fa9e4066Sahrens 1800*fa9e4066Sahrens /* 1801*fa9e4066Sahrens * Get the requested file attributes and place them in the provided 1802*fa9e4066Sahrens * vattr structure. 1803*fa9e4066Sahrens * 1804*fa9e4066Sahrens * IN: vp - vnode of file. 1805*fa9e4066Sahrens * vap - va_mask identifies requested attributes. 1806*fa9e4066Sahrens * flags - [UNUSED] 1807*fa9e4066Sahrens * cr - credentials of caller. 1808*fa9e4066Sahrens * 1809*fa9e4066Sahrens * OUT: vap - attribute values. 1810*fa9e4066Sahrens * 1811*fa9e4066Sahrens * RETURN: 0 (always succeeds) 1812*fa9e4066Sahrens */ 1813*fa9e4066Sahrens /* ARGSUSED */ 1814*fa9e4066Sahrens static int 1815*fa9e4066Sahrens zfs_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr) 1816*fa9e4066Sahrens { 1817*fa9e4066Sahrens znode_t *zp = VTOZ(vp); 1818*fa9e4066Sahrens zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1819*fa9e4066Sahrens znode_phys_t *pzp = zp->z_phys; 1820*fa9e4066Sahrens int error; 1821*fa9e4066Sahrens 1822*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 1823*fa9e4066Sahrens 1824*fa9e4066Sahrens /* 1825*fa9e4066Sahrens * Return all attributes. It's cheaper to provide the answer 1826*fa9e4066Sahrens * than to determine whether we were asked the question. 1827*fa9e4066Sahrens */ 1828*fa9e4066Sahrens mutex_enter(&zp->z_lock); 1829*fa9e4066Sahrens 1830*fa9e4066Sahrens vap->va_type = vp->v_type; 1831*fa9e4066Sahrens vap->va_mode = pzp->zp_mode & MODEMASK; 1832*fa9e4066Sahrens vap->va_uid = zp->z_phys->zp_uid; 1833*fa9e4066Sahrens vap->va_gid = zp->z_phys->zp_gid; 1834*fa9e4066Sahrens vap->va_fsid = zp->z_zfsvfs->z_vfs->vfs_dev; 1835*fa9e4066Sahrens vap->va_nodeid = zp->z_id; 1836*fa9e4066Sahrens vap->va_nlink = MIN(pzp->zp_links, UINT32_MAX); /* nlink_t limit! */ 1837*fa9e4066Sahrens vap->va_size = pzp->zp_size; 1838*fa9e4066Sahrens vap->va_rdev = pzp->zp_rdev; 1839*fa9e4066Sahrens vap->va_seq = zp->z_seq; 1840*fa9e4066Sahrens 1841*fa9e4066Sahrens ZFS_TIME_DECODE(&vap->va_atime, pzp->zp_atime); 1842*fa9e4066Sahrens ZFS_TIME_DECODE(&vap->va_mtime, pzp->zp_mtime); 1843*fa9e4066Sahrens ZFS_TIME_DECODE(&vap->va_ctime, pzp->zp_ctime); 1844*fa9e4066Sahrens 1845*fa9e4066Sahrens /* 1846*fa9e4066Sahrens * Owner should be allowed to always read_attributes 1847*fa9e4066Sahrens */ 1848*fa9e4066Sahrens if (error = zfs_zaccess(zp, ACE_READ_ATTRIBUTES, cr)) { 1849*fa9e4066Sahrens if (zp->z_phys->zp_uid != crgetuid(cr)) { 1850*fa9e4066Sahrens mutex_exit(&zp->z_lock); 1851*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1852*fa9e4066Sahrens return (error); 1853*fa9e4066Sahrens } 1854*fa9e4066Sahrens } 1855*fa9e4066Sahrens 1856*fa9e4066Sahrens mutex_exit(&zp->z_lock); 1857*fa9e4066Sahrens 1858*fa9e4066Sahrens dmu_object_size_from_db(zp->z_dbuf, &vap->va_blksize, &vap->va_nblocks); 1859*fa9e4066Sahrens 1860*fa9e4066Sahrens if (zp->z_blksz == 0) { 1861*fa9e4066Sahrens /* 1862*fa9e4066Sahrens * Block size hasn't been set; suggest maximal I/O transfers. 1863*fa9e4066Sahrens */ 1864*fa9e4066Sahrens vap->va_blksize = zfsvfs->z_max_blksz; 1865*fa9e4066Sahrens } 1866*fa9e4066Sahrens 1867*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1868*fa9e4066Sahrens return (0); 1869*fa9e4066Sahrens } 1870*fa9e4066Sahrens 1871*fa9e4066Sahrens /* 1872*fa9e4066Sahrens * Set the file attributes to the values contained in the 1873*fa9e4066Sahrens * vattr structure. 1874*fa9e4066Sahrens * 1875*fa9e4066Sahrens * IN: vp - vnode of file to be modified. 1876*fa9e4066Sahrens * vap - new attribute values. 1877*fa9e4066Sahrens * flags - ATTR_UTIME set if non-default time values provided. 1878*fa9e4066Sahrens * cr - credentials of caller. 1879*fa9e4066Sahrens * 1880*fa9e4066Sahrens * RETURN: 0 if success 1881*fa9e4066Sahrens * error code if failure 1882*fa9e4066Sahrens * 1883*fa9e4066Sahrens * Timestamps: 1884*fa9e4066Sahrens * vp - ctime updated, mtime updated if size changed. 1885*fa9e4066Sahrens */ 1886*fa9e4066Sahrens /* ARGSUSED */ 1887*fa9e4066Sahrens static int 1888*fa9e4066Sahrens zfs_setattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr, 1889*fa9e4066Sahrens caller_context_t *ct) 1890*fa9e4066Sahrens { 1891*fa9e4066Sahrens struct znode *zp = VTOZ(vp); 1892*fa9e4066Sahrens znode_phys_t *pzp = zp->z_phys; 1893*fa9e4066Sahrens zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1894*fa9e4066Sahrens zilog_t *zilog = zfsvfs->z_log; 1895*fa9e4066Sahrens uint64_t seq = 0; 1896*fa9e4066Sahrens dmu_tx_t *tx; 1897*fa9e4066Sahrens uint_t mask = vap->va_mask; 1898*fa9e4066Sahrens uint_t mask_applied = 0; 1899*fa9e4066Sahrens vattr_t oldva; 1900*fa9e4066Sahrens uint64_t new_mode; 1901*fa9e4066Sahrens int have_grow_lock; 1902*fa9e4066Sahrens int need_policy = FALSE; 1903*fa9e4066Sahrens int err; 1904*fa9e4066Sahrens 1905*fa9e4066Sahrens if (mask == 0) 1906*fa9e4066Sahrens return (0); 1907*fa9e4066Sahrens 1908*fa9e4066Sahrens if (mask & AT_NOSET) 1909*fa9e4066Sahrens return (EINVAL); 1910*fa9e4066Sahrens 1911*fa9e4066Sahrens if (mask & AT_SIZE && vp->v_type == VDIR) 1912*fa9e4066Sahrens return (EISDIR); 1913*fa9e4066Sahrens 1914*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 1915*fa9e4066Sahrens 1916*fa9e4066Sahrens top: 1917*fa9e4066Sahrens have_grow_lock = FALSE; 1918*fa9e4066Sahrens 1919*fa9e4066Sahrens if (zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) { 1920*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1921*fa9e4066Sahrens return (EROFS); 1922*fa9e4066Sahrens } 1923*fa9e4066Sahrens 1924*fa9e4066Sahrens /* 1925*fa9e4066Sahrens * First validate permissions 1926*fa9e4066Sahrens */ 1927*fa9e4066Sahrens 1928*fa9e4066Sahrens if (mask & AT_SIZE) { 1929*fa9e4066Sahrens err = zfs_zaccess(zp, ACE_WRITE_DATA, cr); 1930*fa9e4066Sahrens if (err) { 1931*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1932*fa9e4066Sahrens return (err); 1933*fa9e4066Sahrens } 1934*fa9e4066Sahrens } 1935*fa9e4066Sahrens 1936*fa9e4066Sahrens if (mask & (AT_ATIME|AT_MTIME)) 1937*fa9e4066Sahrens need_policy = zfs_zaccess_v4_perm(zp, ACE_WRITE_ATTRIBUTES, cr); 1938*fa9e4066Sahrens 1939*fa9e4066Sahrens if (mask & (AT_UID|AT_GID)) { 1940*fa9e4066Sahrens int idmask = (mask & (AT_UID|AT_GID)); 1941*fa9e4066Sahrens int take_owner; 1942*fa9e4066Sahrens int take_group; 1943*fa9e4066Sahrens 1944*fa9e4066Sahrens /* 1945*fa9e4066Sahrens * Take ownership or chgrp to group we are a member of 1946*fa9e4066Sahrens */ 1947*fa9e4066Sahrens 1948*fa9e4066Sahrens take_owner = (mask & AT_UID) && (vap->va_uid == crgetuid(cr)); 1949*fa9e4066Sahrens take_group = (mask & AT_GID) && groupmember(vap->va_gid, cr); 1950*fa9e4066Sahrens 1951*fa9e4066Sahrens /* 1952*fa9e4066Sahrens * If both AT_UID and AT_GID are set then take_owner and 1953*fa9e4066Sahrens * take_group must both be set in order to allow taking 1954*fa9e4066Sahrens * ownership. 1955*fa9e4066Sahrens * 1956*fa9e4066Sahrens * Otherwise, send the check through secpolicy_vnode_setattr() 1957*fa9e4066Sahrens * 1958*fa9e4066Sahrens */ 1959*fa9e4066Sahrens 1960*fa9e4066Sahrens if (((idmask == (AT_UID|AT_GID)) && take_owner && take_group) || 1961*fa9e4066Sahrens ((idmask == AT_UID) && take_owner) || 1962*fa9e4066Sahrens ((idmask == AT_GID) && take_group)) { 1963*fa9e4066Sahrens if (zfs_zaccess_v4_perm(zp, ACE_WRITE_OWNER, cr) == 0) { 1964*fa9e4066Sahrens /* 1965*fa9e4066Sahrens * Remove setuid/setgid for non-privileged users 1966*fa9e4066Sahrens */ 1967*fa9e4066Sahrens if ((vap->va_mode & (S_ISUID | S_ISGID)) != 0 && 1968*fa9e4066Sahrens secpolicy_vnode_setid_retain(cr, 1969*fa9e4066Sahrens (vap->va_mode & S_ISUID) != 0 && 1970*fa9e4066Sahrens (mask & AT_UID) != 0 && 1971*fa9e4066Sahrens vap->va_uid == 0) != 0) { 1972*fa9e4066Sahrens vap->va_mode = pzp->zp_mode; 1973*fa9e4066Sahrens vap->va_mask |= AT_MODE; 1974*fa9e4066Sahrens vap->va_mode &= ~(S_ISUID|S_ISGID); 1975*fa9e4066Sahrens } 1976*fa9e4066Sahrens } else { 1977*fa9e4066Sahrens need_policy = TRUE; 1978*fa9e4066Sahrens } 1979*fa9e4066Sahrens } else { 1980*fa9e4066Sahrens need_policy = TRUE; 1981*fa9e4066Sahrens } 1982*fa9e4066Sahrens } 1983*fa9e4066Sahrens 1984*fa9e4066Sahrens if (mask & AT_MODE) 1985*fa9e4066Sahrens need_policy = TRUE; 1986*fa9e4066Sahrens 1987*fa9e4066Sahrens if (need_policy) { 1988*fa9e4066Sahrens mutex_enter(&zp->z_lock); 1989*fa9e4066Sahrens oldva.va_mode = pzp->zp_mode; 1990*fa9e4066Sahrens oldva.va_uid = zp->z_phys->zp_uid; 1991*fa9e4066Sahrens oldva.va_gid = zp->z_phys->zp_gid; 1992*fa9e4066Sahrens mutex_exit(&zp->z_lock); 1993*fa9e4066Sahrens err = secpolicy_vnode_setattr(cr, vp, vap, &oldva, flags, 1994*fa9e4066Sahrens (int (*)(void *, int, cred_t *))zfs_zaccess_rwx, zp); 1995*fa9e4066Sahrens if (err) { 1996*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1997*fa9e4066Sahrens return (err); 1998*fa9e4066Sahrens } 1999*fa9e4066Sahrens } 2000*fa9e4066Sahrens 2001*fa9e4066Sahrens /* 2002*fa9e4066Sahrens * secpolicy_vnode_setattr, or take ownership may have 2003*fa9e4066Sahrens * changed va_mask 2004*fa9e4066Sahrens */ 2005*fa9e4066Sahrens mask = vap->va_mask; 2006*fa9e4066Sahrens 2007*fa9e4066Sahrens tx = dmu_tx_create(zfsvfs->z_os); 2008*fa9e4066Sahrens dmu_tx_hold_bonus(tx, zp->z_id); 2009*fa9e4066Sahrens 2010*fa9e4066Sahrens if (mask & AT_MODE) { 2011*fa9e4066Sahrens 2012*fa9e4066Sahrens new_mode = (pzp->zp_mode & S_IFMT) | (vap->va_mode & ~S_IFMT); 2013*fa9e4066Sahrens 2014*fa9e4066Sahrens if (zp->z_phys->zp_acl.z_acl_extern_obj) 2015*fa9e4066Sahrens dmu_tx_hold_write(tx, 2016*fa9e4066Sahrens pzp->zp_acl.z_acl_extern_obj, 0, SPA_MAXBLOCKSIZE); 2017*fa9e4066Sahrens else 2018*fa9e4066Sahrens dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 2019*fa9e4066Sahrens 0, ZFS_ACL_SIZE(MAX_ACL_SIZE)); 2020*fa9e4066Sahrens } 2021*fa9e4066Sahrens 2022*fa9e4066Sahrens if (mask & AT_SIZE) { 2023*fa9e4066Sahrens uint64_t off = vap->va_size; 2024*fa9e4066Sahrens /* 2025*fa9e4066Sahrens * Grab the grow_lock to serialize this change with 2026*fa9e4066Sahrens * respect to other file manipulations. 2027*fa9e4066Sahrens */ 2028*fa9e4066Sahrens rw_enter(&zp->z_grow_lock, RW_WRITER); 2029*fa9e4066Sahrens have_grow_lock = TRUE; 2030*fa9e4066Sahrens if (off < zp->z_phys->zp_size) 2031*fa9e4066Sahrens dmu_tx_hold_free(tx, zp->z_id, off, DMU_OBJECT_END); 2032*fa9e4066Sahrens else if (zp->z_phys->zp_size && 2033*fa9e4066Sahrens zp->z_blksz < zfsvfs->z_max_blksz && off > zp->z_blksz) 2034*fa9e4066Sahrens /* we will rewrite this block if we grow */ 2035*fa9e4066Sahrens dmu_tx_hold_write(tx, zp->z_id, 0, zp->z_phys->zp_size); 2036*fa9e4066Sahrens } 2037*fa9e4066Sahrens 2038*fa9e4066Sahrens err = dmu_tx_assign(tx, zfsvfs->z_assign); 2039*fa9e4066Sahrens if (err) { 2040*fa9e4066Sahrens dmu_tx_abort(tx); 2041*fa9e4066Sahrens if (have_grow_lock) 2042*fa9e4066Sahrens rw_exit(&zp->z_grow_lock); 2043*fa9e4066Sahrens if (err == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { 2044*fa9e4066Sahrens txg_wait_open(dmu_objset_pool(zfsvfs->z_os), 0); 2045*fa9e4066Sahrens goto top; 2046*fa9e4066Sahrens } 2047*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2048*fa9e4066Sahrens return (err); 2049*fa9e4066Sahrens } 2050*fa9e4066Sahrens 2051*fa9e4066Sahrens dmu_buf_will_dirty(zp->z_dbuf, tx); 2052*fa9e4066Sahrens 2053*fa9e4066Sahrens /* 2054*fa9e4066Sahrens * Set each attribute requested. 2055*fa9e4066Sahrens * We group settings according to the locks they need to acquire. 2056*fa9e4066Sahrens * 2057*fa9e4066Sahrens * Note: you cannot set ctime directly, although it will be 2058*fa9e4066Sahrens * updated as a side-effect of calling this function. 2059*fa9e4066Sahrens */ 2060*fa9e4066Sahrens if (mask & AT_SIZE) { 2061*fa9e4066Sahrens /* 2062*fa9e4066Sahrens * XXX - Note, we are not providing any open 2063*fa9e4066Sahrens * mode flags here (like FNDELAY), so we may 2064*fa9e4066Sahrens * block if there are locks present... this 2065*fa9e4066Sahrens * should be addressed in openat(). 2066*fa9e4066Sahrens */ 2067*fa9e4066Sahrens err = zfs_freesp(zp, vap->va_size, 0, 0, tx, cr); 2068*fa9e4066Sahrens if (err) { 2069*fa9e4066Sahrens mutex_enter(&zp->z_lock); 2070*fa9e4066Sahrens goto out; 2071*fa9e4066Sahrens } 2072*fa9e4066Sahrens mask_applied |= AT_SIZE; 2073*fa9e4066Sahrens } 2074*fa9e4066Sahrens 2075*fa9e4066Sahrens mask_applied = mask; /* no errors after this point */ 2076*fa9e4066Sahrens 2077*fa9e4066Sahrens mutex_enter(&zp->z_lock); 2078*fa9e4066Sahrens 2079*fa9e4066Sahrens if (mask & AT_MODE) { 2080*fa9e4066Sahrens err = zfs_acl_chmod_setattr(zp, new_mode, tx); 2081*fa9e4066Sahrens ASSERT3U(err, ==, 0); 2082*fa9e4066Sahrens } 2083*fa9e4066Sahrens 2084*fa9e4066Sahrens if ((mask & AT_UID) && vap->va_uid != oldva.va_uid) 2085*fa9e4066Sahrens zp->z_phys->zp_uid = (uint64_t)vap->va_uid; 2086*fa9e4066Sahrens 2087*fa9e4066Sahrens if ((mask & AT_GID) && vap->va_gid != oldva.va_gid) 2088*fa9e4066Sahrens zp->z_phys->zp_gid = (uint64_t)vap->va_gid; 2089*fa9e4066Sahrens 2090*fa9e4066Sahrens if (mask & AT_ATIME) 2091*fa9e4066Sahrens ZFS_TIME_ENCODE(&vap->va_atime, pzp->zp_atime); 2092*fa9e4066Sahrens 2093*fa9e4066Sahrens if (mask & AT_MTIME) 2094*fa9e4066Sahrens ZFS_TIME_ENCODE(&vap->va_mtime, pzp->zp_mtime); 2095*fa9e4066Sahrens 2096*fa9e4066Sahrens if (mask_applied & AT_SIZE) 2097*fa9e4066Sahrens zfs_time_stamper_locked(zp, CONTENT_MODIFIED, tx); 2098*fa9e4066Sahrens else if (mask_applied != 0) 2099*fa9e4066Sahrens zfs_time_stamper_locked(zp, STATE_CHANGED, tx); 2100*fa9e4066Sahrens 2101*fa9e4066Sahrens out: 2102*fa9e4066Sahrens if (mask_applied != 0) 2103*fa9e4066Sahrens seq = zfs_log_setattr(zilog, tx, TX_SETATTR, zp, vap, 2104*fa9e4066Sahrens mask_applied); 2105*fa9e4066Sahrens 2106*fa9e4066Sahrens mutex_exit(&zp->z_lock); 2107*fa9e4066Sahrens 2108*fa9e4066Sahrens if (have_grow_lock) 2109*fa9e4066Sahrens rw_exit(&zp->z_grow_lock); 2110*fa9e4066Sahrens 2111*fa9e4066Sahrens dmu_tx_commit(tx); 2112*fa9e4066Sahrens 2113*fa9e4066Sahrens zil_commit(zilog, seq, 0); 2114*fa9e4066Sahrens 2115*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2116*fa9e4066Sahrens return (err); 2117*fa9e4066Sahrens } 2118*fa9e4066Sahrens 2119*fa9e4066Sahrens /* 2120*fa9e4066Sahrens * Search back through the directory tree, using the ".." entries. 2121*fa9e4066Sahrens * Lock each directory in the chain to prevent concurrent renames. 2122*fa9e4066Sahrens * Fail any attempt to move a directory into one of its own descendants. 2123*fa9e4066Sahrens * XXX - z_parent_lock can overlap with map or grow locks 2124*fa9e4066Sahrens */ 2125*fa9e4066Sahrens typedef struct zfs_zlock { 2126*fa9e4066Sahrens krwlock_t *zl_rwlock; /* lock we acquired */ 2127*fa9e4066Sahrens znode_t *zl_znode; /* znode we held */ 2128*fa9e4066Sahrens struct zfs_zlock *zl_next; /* next in list */ 2129*fa9e4066Sahrens } zfs_zlock_t; 2130*fa9e4066Sahrens 2131*fa9e4066Sahrens static int 2132*fa9e4066Sahrens zfs_rename_lock(znode_t *szp, znode_t *tdzp, znode_t *sdzp, zfs_zlock_t **zlpp) 2133*fa9e4066Sahrens { 2134*fa9e4066Sahrens zfs_zlock_t *zl; 2135*fa9e4066Sahrens znode_t *zp = tdzp; 2136*fa9e4066Sahrens uint64_t rootid = zp->z_zfsvfs->z_root; 2137*fa9e4066Sahrens uint64_t *oidp = &zp->z_id; 2138*fa9e4066Sahrens krwlock_t *rwlp = &szp->z_parent_lock; 2139*fa9e4066Sahrens krw_t rw = RW_WRITER; 2140*fa9e4066Sahrens 2141*fa9e4066Sahrens /* 2142*fa9e4066Sahrens * First pass write-locks szp and compares to zp->z_id. 2143*fa9e4066Sahrens * Later passes read-lock zp and compare to zp->z_parent. 2144*fa9e4066Sahrens */ 2145*fa9e4066Sahrens do { 2146*fa9e4066Sahrens zl = kmem_alloc(sizeof (*zl), KM_SLEEP); 2147*fa9e4066Sahrens zl->zl_rwlock = rwlp; 2148*fa9e4066Sahrens zl->zl_znode = NULL; 2149*fa9e4066Sahrens zl->zl_next = *zlpp; 2150*fa9e4066Sahrens *zlpp = zl; 2151*fa9e4066Sahrens 2152*fa9e4066Sahrens rw_enter(rwlp, rw); 2153*fa9e4066Sahrens 2154*fa9e4066Sahrens if (*oidp == szp->z_id) /* We're a descendant of szp */ 2155*fa9e4066Sahrens return (EINVAL); 2156*fa9e4066Sahrens 2157*fa9e4066Sahrens if (*oidp == rootid) /* We've hit the top */ 2158*fa9e4066Sahrens return (0); 2159*fa9e4066Sahrens 2160*fa9e4066Sahrens if (rw == RW_READER) { /* i.e. not the first pass */ 2161*fa9e4066Sahrens int error = zfs_zget(zp->z_zfsvfs, *oidp, &zp); 2162*fa9e4066Sahrens if (error) 2163*fa9e4066Sahrens return (error); 2164*fa9e4066Sahrens zl->zl_znode = zp; 2165*fa9e4066Sahrens } 2166*fa9e4066Sahrens oidp = &zp->z_phys->zp_parent; 2167*fa9e4066Sahrens rwlp = &zp->z_parent_lock; 2168*fa9e4066Sahrens rw = RW_READER; 2169*fa9e4066Sahrens 2170*fa9e4066Sahrens } while (zp->z_id != sdzp->z_id); 2171*fa9e4066Sahrens 2172*fa9e4066Sahrens return (0); 2173*fa9e4066Sahrens } 2174*fa9e4066Sahrens 2175*fa9e4066Sahrens /* 2176*fa9e4066Sahrens * Drop locks and release vnodes that were held by zfs_rename_lock(). 2177*fa9e4066Sahrens */ 2178*fa9e4066Sahrens static void 2179*fa9e4066Sahrens zfs_rename_unlock(zfs_zlock_t **zlpp) 2180*fa9e4066Sahrens { 2181*fa9e4066Sahrens zfs_zlock_t *zl; 2182*fa9e4066Sahrens 2183*fa9e4066Sahrens while ((zl = *zlpp) != NULL) { 2184*fa9e4066Sahrens if (zl->zl_znode != NULL) 2185*fa9e4066Sahrens VN_RELE(ZTOV(zl->zl_znode)); 2186*fa9e4066Sahrens rw_exit(zl->zl_rwlock); 2187*fa9e4066Sahrens *zlpp = zl->zl_next; 2188*fa9e4066Sahrens kmem_free(zl, sizeof (*zl)); 2189*fa9e4066Sahrens } 2190*fa9e4066Sahrens } 2191*fa9e4066Sahrens 2192*fa9e4066Sahrens /* 2193*fa9e4066Sahrens * Move an entry from the provided source directory to the target 2194*fa9e4066Sahrens * directory. Change the entry name as indicated. 2195*fa9e4066Sahrens * 2196*fa9e4066Sahrens * IN: sdvp - Source directory containing the "old entry". 2197*fa9e4066Sahrens * snm - Old entry name. 2198*fa9e4066Sahrens * tdvp - Target directory to contain the "new entry". 2199*fa9e4066Sahrens * tnm - New entry name. 2200*fa9e4066Sahrens * cr - credentials of caller. 2201*fa9e4066Sahrens * 2202*fa9e4066Sahrens * RETURN: 0 if success 2203*fa9e4066Sahrens * error code if failure 2204*fa9e4066Sahrens * 2205*fa9e4066Sahrens * Timestamps: 2206*fa9e4066Sahrens * sdvp,tdvp - ctime|mtime updated 2207*fa9e4066Sahrens */ 2208*fa9e4066Sahrens static int 2209*fa9e4066Sahrens zfs_rename(vnode_t *sdvp, char *snm, vnode_t *tdvp, char *tnm, cred_t *cr) 2210*fa9e4066Sahrens { 2211*fa9e4066Sahrens znode_t *tdzp, *szp, *tzp; 2212*fa9e4066Sahrens znode_t *sdzp = VTOZ(sdvp); 2213*fa9e4066Sahrens zfsvfs_t *zfsvfs = sdzp->z_zfsvfs; 2214*fa9e4066Sahrens zilog_t *zilog = zfsvfs->z_log; 2215*fa9e4066Sahrens uint64_t seq = 0; 2216*fa9e4066Sahrens vnode_t *realvp; 2217*fa9e4066Sahrens zfs_dirlock_t *sdl, *tdl; 2218*fa9e4066Sahrens dmu_tx_t *tx; 2219*fa9e4066Sahrens zfs_zlock_t *zl; 2220*fa9e4066Sahrens int cmp, serr, terr, error; 2221*fa9e4066Sahrens 2222*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 2223*fa9e4066Sahrens 2224*fa9e4066Sahrens /* 2225*fa9e4066Sahrens * Make sure we have the real vp for the target directory. 2226*fa9e4066Sahrens */ 2227*fa9e4066Sahrens if (VOP_REALVP(tdvp, &realvp) == 0) 2228*fa9e4066Sahrens tdvp = realvp; 2229*fa9e4066Sahrens 2230*fa9e4066Sahrens if (tdvp->v_vfsp != sdvp->v_vfsp) { 2231*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2232*fa9e4066Sahrens return (EXDEV); 2233*fa9e4066Sahrens } 2234*fa9e4066Sahrens 2235*fa9e4066Sahrens tdzp = VTOZ(tdvp); 2236*fa9e4066Sahrens top: 2237*fa9e4066Sahrens szp = NULL; 2238*fa9e4066Sahrens tzp = NULL; 2239*fa9e4066Sahrens zl = NULL; 2240*fa9e4066Sahrens 2241*fa9e4066Sahrens /* 2242*fa9e4066Sahrens * This is to prevent the creation of links into attribute space 2243*fa9e4066Sahrens * by renaming a linked file into/outof an attribute directory. 2244*fa9e4066Sahrens * See the comment in zfs_link() for why this is considered bad. 2245*fa9e4066Sahrens */ 2246*fa9e4066Sahrens if ((tdzp->z_phys->zp_flags & ZFS_XATTR) != 2247*fa9e4066Sahrens (sdzp->z_phys->zp_flags & ZFS_XATTR)) { 2248*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2249*fa9e4066Sahrens return (EINVAL); 2250*fa9e4066Sahrens } 2251*fa9e4066Sahrens 2252*fa9e4066Sahrens /* 2253*fa9e4066Sahrens * Lock source and target directory entries. To prevent deadlock, 2254*fa9e4066Sahrens * a lock ordering must be defined. We lock the directory with 2255*fa9e4066Sahrens * the smallest object id first, or if it's a tie, the one with 2256*fa9e4066Sahrens * the lexically first name. 2257*fa9e4066Sahrens */ 2258*fa9e4066Sahrens if (sdzp->z_id < tdzp->z_id) { 2259*fa9e4066Sahrens cmp = -1; 2260*fa9e4066Sahrens } else if (sdzp->z_id > tdzp->z_id) { 2261*fa9e4066Sahrens cmp = 1; 2262*fa9e4066Sahrens } else { 2263*fa9e4066Sahrens cmp = strcmp(snm, tnm); 2264*fa9e4066Sahrens if (cmp == 0) { 2265*fa9e4066Sahrens /* 2266*fa9e4066Sahrens * POSIX: "If the old argument and the new argument 2267*fa9e4066Sahrens * both refer to links to the same existing file, 2268*fa9e4066Sahrens * the rename() function shall return successfully 2269*fa9e4066Sahrens * and perform no other action." 2270*fa9e4066Sahrens */ 2271*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2272*fa9e4066Sahrens return (0); 2273*fa9e4066Sahrens } 2274*fa9e4066Sahrens } 2275*fa9e4066Sahrens if (cmp < 0) { 2276*fa9e4066Sahrens serr = zfs_dirent_lock(&sdl, sdzp, snm, &szp, ZEXISTS); 2277*fa9e4066Sahrens terr = zfs_dirent_lock(&tdl, tdzp, tnm, &tzp, 0); 2278*fa9e4066Sahrens } else { 2279*fa9e4066Sahrens terr = zfs_dirent_lock(&tdl, tdzp, tnm, &tzp, 0); 2280*fa9e4066Sahrens serr = zfs_dirent_lock(&sdl, sdzp, snm, &szp, ZEXISTS); 2281*fa9e4066Sahrens } 2282*fa9e4066Sahrens 2283*fa9e4066Sahrens if (serr) { 2284*fa9e4066Sahrens /* 2285*fa9e4066Sahrens * Source entry invalid or not there. 2286*fa9e4066Sahrens */ 2287*fa9e4066Sahrens if (!terr) { 2288*fa9e4066Sahrens zfs_dirent_unlock(tdl); 2289*fa9e4066Sahrens if (tzp) 2290*fa9e4066Sahrens VN_RELE(ZTOV(tzp)); 2291*fa9e4066Sahrens } 2292*fa9e4066Sahrens if (strcmp(snm, "..") == 0) 2293*fa9e4066Sahrens serr = EINVAL; 2294*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2295*fa9e4066Sahrens return (serr); 2296*fa9e4066Sahrens } 2297*fa9e4066Sahrens if (terr) { 2298*fa9e4066Sahrens zfs_dirent_unlock(sdl); 2299*fa9e4066Sahrens VN_RELE(ZTOV(szp)); 2300*fa9e4066Sahrens if (strcmp(tnm, "..") == 0) 2301*fa9e4066Sahrens terr = EINVAL; 2302*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2303*fa9e4066Sahrens return (terr); 2304*fa9e4066Sahrens } 2305*fa9e4066Sahrens 2306*fa9e4066Sahrens /* 2307*fa9e4066Sahrens * Must have write access at the source to remove the old entry 2308*fa9e4066Sahrens * and write access at the target to create the new entry. 2309*fa9e4066Sahrens * Note that if target and source are the same, this can be 2310*fa9e4066Sahrens * done in a single check. 2311*fa9e4066Sahrens */ 2312*fa9e4066Sahrens 2313*fa9e4066Sahrens if (error = zfs_zaccess_rename(sdzp, szp, tdzp, tzp, cr)) 2314*fa9e4066Sahrens goto out; 2315*fa9e4066Sahrens 2316*fa9e4066Sahrens if (ZTOV(szp)->v_type == VDIR) { 2317*fa9e4066Sahrens /* 2318*fa9e4066Sahrens * Check to make sure rename is valid. 2319*fa9e4066Sahrens * Can't do a move like this: /usr/a/b to /usr/a/b/c/d 2320*fa9e4066Sahrens */ 2321*fa9e4066Sahrens if (error = zfs_rename_lock(szp, tdzp, sdzp, &zl)) 2322*fa9e4066Sahrens goto out; 2323*fa9e4066Sahrens } 2324*fa9e4066Sahrens 2325*fa9e4066Sahrens /* 2326*fa9e4066Sahrens * Does target exist? 2327*fa9e4066Sahrens */ 2328*fa9e4066Sahrens if (tzp) { 2329*fa9e4066Sahrens /* 2330*fa9e4066Sahrens * Source and target must be the same type. 2331*fa9e4066Sahrens */ 2332*fa9e4066Sahrens if (ZTOV(szp)->v_type == VDIR) { 2333*fa9e4066Sahrens if (ZTOV(tzp)->v_type != VDIR) { 2334*fa9e4066Sahrens error = ENOTDIR; 2335*fa9e4066Sahrens goto out; 2336*fa9e4066Sahrens } 2337*fa9e4066Sahrens } else { 2338*fa9e4066Sahrens if (ZTOV(tzp)->v_type == VDIR) { 2339*fa9e4066Sahrens error = EISDIR; 2340*fa9e4066Sahrens goto out; 2341*fa9e4066Sahrens } 2342*fa9e4066Sahrens } 2343*fa9e4066Sahrens /* 2344*fa9e4066Sahrens * POSIX dictates that when the source and target 2345*fa9e4066Sahrens * entries refer to the same file object, rename 2346*fa9e4066Sahrens * must do nothing and exit without error. 2347*fa9e4066Sahrens */ 2348*fa9e4066Sahrens if (szp->z_id == tzp->z_id) { 2349*fa9e4066Sahrens error = 0; 2350*fa9e4066Sahrens goto out; 2351*fa9e4066Sahrens } 2352*fa9e4066Sahrens } 2353*fa9e4066Sahrens 2354*fa9e4066Sahrens vnevent_rename_src(ZTOV(szp)); 2355*fa9e4066Sahrens if (tzp) 2356*fa9e4066Sahrens vnevent_rename_dest(ZTOV(tzp)); 2357*fa9e4066Sahrens 2358*fa9e4066Sahrens tx = dmu_tx_create(zfsvfs->z_os); 2359*fa9e4066Sahrens dmu_tx_hold_bonus(tx, szp->z_id); /* nlink changes */ 2360*fa9e4066Sahrens dmu_tx_hold_bonus(tx, sdzp->z_id); /* nlink changes */ 2361*fa9e4066Sahrens if (sdzp != tdzp) { 2362*fa9e4066Sahrens dmu_tx_hold_zap(tx, sdzp->z_id, 1); 2363*fa9e4066Sahrens dmu_tx_hold_zap(tx, tdzp->z_id, 1); 2364*fa9e4066Sahrens dmu_tx_hold_bonus(tx, tdzp->z_id); /* nlink changes */ 2365*fa9e4066Sahrens } else { 2366*fa9e4066Sahrens dmu_tx_hold_zap(tx, sdzp->z_id, 2); 2367*fa9e4066Sahrens } 2368*fa9e4066Sahrens if (tzp) { 2369*fa9e4066Sahrens dmu_tx_hold_bonus(tx, tzp->z_id); /* nlink changes */ 2370*fa9e4066Sahrens } 2371*fa9e4066Sahrens dmu_tx_hold_zap(tx, zfsvfs->z_dqueue, 1); 2372*fa9e4066Sahrens error = dmu_tx_assign(tx, zfsvfs->z_assign); 2373*fa9e4066Sahrens if (error) { 2374*fa9e4066Sahrens dmu_tx_abort(tx); 2375*fa9e4066Sahrens if (zl != NULL) 2376*fa9e4066Sahrens zfs_rename_unlock(&zl); 2377*fa9e4066Sahrens zfs_dirent_unlock(sdl); 2378*fa9e4066Sahrens zfs_dirent_unlock(tdl); 2379*fa9e4066Sahrens VN_RELE(ZTOV(szp)); 2380*fa9e4066Sahrens if (tzp) 2381*fa9e4066Sahrens VN_RELE(ZTOV(tzp)); 2382*fa9e4066Sahrens if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { 2383*fa9e4066Sahrens txg_wait_open(dmu_objset_pool(zfsvfs->z_os), 0); 2384*fa9e4066Sahrens goto top; 2385*fa9e4066Sahrens } 2386*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2387*fa9e4066Sahrens return (error); 2388*fa9e4066Sahrens } 2389*fa9e4066Sahrens 2390*fa9e4066Sahrens if (tzp) /* Attempt to remove the existing target */ 2391*fa9e4066Sahrens error = zfs_link_destroy(tdl, tzp, tx, 0, NULL); 2392*fa9e4066Sahrens 2393*fa9e4066Sahrens if (error == 0) { 2394*fa9e4066Sahrens error = zfs_link_create(tdl, szp, tx, ZRENAMING); 2395*fa9e4066Sahrens if (error == 0) { 2396*fa9e4066Sahrens error = zfs_link_destroy(sdl, szp, tx, ZRENAMING, NULL); 2397*fa9e4066Sahrens ASSERT(error == 0); 2398*fa9e4066Sahrens seq = zfs_log_rename(zilog, tx, TX_RENAME, 2399*fa9e4066Sahrens sdzp, sdl->dl_name, tdzp, tdl->dl_name, szp); 2400*fa9e4066Sahrens } 2401*fa9e4066Sahrens } 2402*fa9e4066Sahrens 2403*fa9e4066Sahrens dmu_tx_commit(tx); 2404*fa9e4066Sahrens out: 2405*fa9e4066Sahrens if (zl != NULL) 2406*fa9e4066Sahrens zfs_rename_unlock(&zl); 2407*fa9e4066Sahrens 2408*fa9e4066Sahrens zfs_dirent_unlock(sdl); 2409*fa9e4066Sahrens zfs_dirent_unlock(tdl); 2410*fa9e4066Sahrens 2411*fa9e4066Sahrens VN_RELE(ZTOV(szp)); 2412*fa9e4066Sahrens if (tzp) 2413*fa9e4066Sahrens VN_RELE(ZTOV(tzp)); 2414*fa9e4066Sahrens 2415*fa9e4066Sahrens zil_commit(zilog, seq, 0); 2416*fa9e4066Sahrens 2417*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2418*fa9e4066Sahrens return (error); 2419*fa9e4066Sahrens } 2420*fa9e4066Sahrens 2421*fa9e4066Sahrens /* 2422*fa9e4066Sahrens * Insert the indicated symbolic reference entry into the directory. 2423*fa9e4066Sahrens * 2424*fa9e4066Sahrens * IN: dvp - Directory to contain new symbolic link. 2425*fa9e4066Sahrens * link - Name for new symlink entry. 2426*fa9e4066Sahrens * vap - Attributes of new entry. 2427*fa9e4066Sahrens * target - Target path of new symlink. 2428*fa9e4066Sahrens * cr - credentials of caller. 2429*fa9e4066Sahrens * 2430*fa9e4066Sahrens * RETURN: 0 if success 2431*fa9e4066Sahrens * error code if failure 2432*fa9e4066Sahrens * 2433*fa9e4066Sahrens * Timestamps: 2434*fa9e4066Sahrens * dvp - ctime|mtime updated 2435*fa9e4066Sahrens */ 2436*fa9e4066Sahrens static int 2437*fa9e4066Sahrens zfs_symlink(vnode_t *dvp, char *name, vattr_t *vap, char *link, cred_t *cr) 2438*fa9e4066Sahrens { 2439*fa9e4066Sahrens znode_t *zp, *dzp = VTOZ(dvp); 2440*fa9e4066Sahrens zfs_dirlock_t *dl; 2441*fa9e4066Sahrens dmu_tx_t *tx; 2442*fa9e4066Sahrens zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 2443*fa9e4066Sahrens zilog_t *zilog = zfsvfs->z_log; 2444*fa9e4066Sahrens uint64_t seq = 0; 2445*fa9e4066Sahrens uint64_t zoid; 2446*fa9e4066Sahrens int len = strlen(link); 2447*fa9e4066Sahrens int error; 2448*fa9e4066Sahrens 2449*fa9e4066Sahrens ASSERT(vap->va_type == VLNK); 2450*fa9e4066Sahrens 2451*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 2452*fa9e4066Sahrens top: 2453*fa9e4066Sahrens if (error = zfs_zaccess(dzp, ACE_ADD_FILE, cr)) { 2454*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2455*fa9e4066Sahrens return (error); 2456*fa9e4066Sahrens } 2457*fa9e4066Sahrens 2458*fa9e4066Sahrens if (len > MAXPATHLEN) { 2459*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2460*fa9e4066Sahrens return (ENAMETOOLONG); 2461*fa9e4066Sahrens } 2462*fa9e4066Sahrens 2463*fa9e4066Sahrens /* 2464*fa9e4066Sahrens * Attempt to lock directory; fail if entry already exists. 2465*fa9e4066Sahrens */ 2466*fa9e4066Sahrens if (error = zfs_dirent_lock(&dl, dzp, name, &zp, ZNEW)) { 2467*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2468*fa9e4066Sahrens return (error); 2469*fa9e4066Sahrens } 2470*fa9e4066Sahrens 2471*fa9e4066Sahrens tx = dmu_tx_create(zfsvfs->z_os); 2472*fa9e4066Sahrens dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, MAX(1, len)); 2473*fa9e4066Sahrens dmu_tx_hold_bonus(tx, dzp->z_id); 2474*fa9e4066Sahrens dmu_tx_hold_zap(tx, dzp->z_id, 1); 2475*fa9e4066Sahrens if (dzp->z_phys->zp_flags & ZFS_INHERIT_ACE) 2476*fa9e4066Sahrens dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, SPA_MAXBLOCKSIZE); 2477*fa9e4066Sahrens error = dmu_tx_assign(tx, zfsvfs->z_assign); 2478*fa9e4066Sahrens if (error) { 2479*fa9e4066Sahrens dmu_tx_abort(tx); 2480*fa9e4066Sahrens zfs_dirent_unlock(dl); 2481*fa9e4066Sahrens if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { 2482*fa9e4066Sahrens txg_wait_open(dmu_objset_pool(zfsvfs->z_os), 0); 2483*fa9e4066Sahrens goto top; 2484*fa9e4066Sahrens } 2485*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2486*fa9e4066Sahrens return (error); 2487*fa9e4066Sahrens } 2488*fa9e4066Sahrens 2489*fa9e4066Sahrens dmu_buf_will_dirty(dzp->z_dbuf, tx); 2490*fa9e4066Sahrens 2491*fa9e4066Sahrens /* 2492*fa9e4066Sahrens * Create a new object for the symlink. 2493*fa9e4066Sahrens * Put the link content into bonus buffer if it will fit; 2494*fa9e4066Sahrens * otherwise, store it just like any other file data. 2495*fa9e4066Sahrens */ 2496*fa9e4066Sahrens zoid = 0; 2497*fa9e4066Sahrens if (sizeof (znode_phys_t) + len <= dmu_bonus_max()) { 2498*fa9e4066Sahrens zfs_mknode(dzp, vap, &zoid, tx, cr, 0, &zp, len); 2499*fa9e4066Sahrens if (len != 0) 2500*fa9e4066Sahrens bcopy(link, zp->z_phys + 1, len); 2501*fa9e4066Sahrens } else { 2502*fa9e4066Sahrens dmu_buf_t *dbp; 2503*fa9e4066Sahrens zfs_mknode(dzp, vap, &zoid, tx, cr, 0, &zp, 0); 2504*fa9e4066Sahrens 2505*fa9e4066Sahrens rw_enter(&zp->z_grow_lock, RW_WRITER); 2506*fa9e4066Sahrens error = zfs_grow_blocksize(zp, len, tx); 2507*fa9e4066Sahrens rw_exit(&zp->z_grow_lock); 2508*fa9e4066Sahrens if (error) 2509*fa9e4066Sahrens goto out; 2510*fa9e4066Sahrens 2511*fa9e4066Sahrens dbp = dmu_buf_hold(zfsvfs->z_os, zoid, 0); 2512*fa9e4066Sahrens dmu_buf_will_dirty(dbp, tx); 2513*fa9e4066Sahrens 2514*fa9e4066Sahrens ASSERT3U(len, <=, dbp->db_size); 2515*fa9e4066Sahrens bcopy(link, dbp->db_data, len); 2516*fa9e4066Sahrens dmu_buf_rele(dbp); 2517*fa9e4066Sahrens } 2518*fa9e4066Sahrens zp->z_phys->zp_size = len; 2519*fa9e4066Sahrens 2520*fa9e4066Sahrens /* 2521*fa9e4066Sahrens * Insert the new object into the directory. 2522*fa9e4066Sahrens */ 2523*fa9e4066Sahrens (void) zfs_link_create(dl, zp, tx, ZNEW); 2524*fa9e4066Sahrens out: 2525*fa9e4066Sahrens if (error == 0) 2526*fa9e4066Sahrens seq = zfs_log_symlink(zilog, tx, TX_SYMLINK, 2527*fa9e4066Sahrens dzp, zp, name, link); 2528*fa9e4066Sahrens 2529*fa9e4066Sahrens dmu_tx_commit(tx); 2530*fa9e4066Sahrens 2531*fa9e4066Sahrens zfs_dirent_unlock(dl); 2532*fa9e4066Sahrens 2533*fa9e4066Sahrens VN_RELE(ZTOV(zp)); 2534*fa9e4066Sahrens 2535*fa9e4066Sahrens zil_commit(zilog, seq, 0); 2536*fa9e4066Sahrens 2537*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2538*fa9e4066Sahrens return (error); 2539*fa9e4066Sahrens } 2540*fa9e4066Sahrens 2541*fa9e4066Sahrens /* 2542*fa9e4066Sahrens * Return, in the buffer contained in the provided uio structure, 2543*fa9e4066Sahrens * the symbolic path referred to by vp. 2544*fa9e4066Sahrens * 2545*fa9e4066Sahrens * IN: vp - vnode of symbolic link. 2546*fa9e4066Sahrens * uoip - structure to contain the link path. 2547*fa9e4066Sahrens * cr - credentials of caller. 2548*fa9e4066Sahrens * 2549*fa9e4066Sahrens * OUT: uio - structure to contain the link path. 2550*fa9e4066Sahrens * 2551*fa9e4066Sahrens * RETURN: 0 if success 2552*fa9e4066Sahrens * error code if failure 2553*fa9e4066Sahrens * 2554*fa9e4066Sahrens * Timestamps: 2555*fa9e4066Sahrens * vp - atime updated 2556*fa9e4066Sahrens */ 2557*fa9e4066Sahrens /* ARGSUSED */ 2558*fa9e4066Sahrens static int 2559*fa9e4066Sahrens zfs_readlink(vnode_t *vp, uio_t *uio, cred_t *cr) 2560*fa9e4066Sahrens { 2561*fa9e4066Sahrens znode_t *zp = VTOZ(vp); 2562*fa9e4066Sahrens zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2563*fa9e4066Sahrens size_t bufsz; 2564*fa9e4066Sahrens int error; 2565*fa9e4066Sahrens 2566*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 2567*fa9e4066Sahrens 2568*fa9e4066Sahrens bufsz = (size_t)zp->z_phys->zp_size; 2569*fa9e4066Sahrens if (bufsz + sizeof (znode_phys_t) <= zp->z_dbuf->db_size) { 2570*fa9e4066Sahrens error = uiomove(zp->z_phys + 1, 2571*fa9e4066Sahrens MIN((size_t)bufsz, uio->uio_resid), UIO_READ, uio); 2572*fa9e4066Sahrens } else { 2573*fa9e4066Sahrens dmu_buf_t *dbp = dmu_buf_hold(zfsvfs->z_os, zp->z_id, 0); 2574*fa9e4066Sahrens if ((error = dmu_buf_read_canfail(dbp)) != 0) { 2575*fa9e4066Sahrens dmu_buf_rele(dbp); 2576*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2577*fa9e4066Sahrens return (error); 2578*fa9e4066Sahrens } 2579*fa9e4066Sahrens error = uiomove(dbp->db_data, 2580*fa9e4066Sahrens MIN((size_t)bufsz, uio->uio_resid), UIO_READ, uio); 2581*fa9e4066Sahrens dmu_buf_rele(dbp); 2582*fa9e4066Sahrens } 2583*fa9e4066Sahrens 2584*fa9e4066Sahrens ZFS_ACCESSTIME_STAMP(zfsvfs, zp); 2585*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2586*fa9e4066Sahrens return (error); 2587*fa9e4066Sahrens } 2588*fa9e4066Sahrens 2589*fa9e4066Sahrens /* 2590*fa9e4066Sahrens * Insert a new entry into directory tdvp referencing svp. 2591*fa9e4066Sahrens * 2592*fa9e4066Sahrens * IN: tdvp - Directory to contain new entry. 2593*fa9e4066Sahrens * svp - vnode of new entry. 2594*fa9e4066Sahrens * name - name of new entry. 2595*fa9e4066Sahrens * cr - credentials of caller. 2596*fa9e4066Sahrens * 2597*fa9e4066Sahrens * RETURN: 0 if success 2598*fa9e4066Sahrens * error code if failure 2599*fa9e4066Sahrens * 2600*fa9e4066Sahrens * Timestamps: 2601*fa9e4066Sahrens * tdvp - ctime|mtime updated 2602*fa9e4066Sahrens * svp - ctime updated 2603*fa9e4066Sahrens */ 2604*fa9e4066Sahrens /* ARGSUSED */ 2605*fa9e4066Sahrens static int 2606*fa9e4066Sahrens zfs_link(vnode_t *tdvp, vnode_t *svp, char *name, cred_t *cr) 2607*fa9e4066Sahrens { 2608*fa9e4066Sahrens znode_t *dzp = VTOZ(tdvp); 2609*fa9e4066Sahrens znode_t *tzp, *szp; 2610*fa9e4066Sahrens zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 2611*fa9e4066Sahrens zilog_t *zilog = zfsvfs->z_log; 2612*fa9e4066Sahrens uint64_t seq = 0; 2613*fa9e4066Sahrens zfs_dirlock_t *dl; 2614*fa9e4066Sahrens dmu_tx_t *tx; 2615*fa9e4066Sahrens vnode_t *realvp; 2616*fa9e4066Sahrens int error; 2617*fa9e4066Sahrens 2618*fa9e4066Sahrens ASSERT(tdvp->v_type == VDIR); 2619*fa9e4066Sahrens 2620*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 2621*fa9e4066Sahrens 2622*fa9e4066Sahrens if (VOP_REALVP(svp, &realvp) == 0) 2623*fa9e4066Sahrens svp = realvp; 2624*fa9e4066Sahrens 2625*fa9e4066Sahrens if (svp->v_vfsp != tdvp->v_vfsp) { 2626*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2627*fa9e4066Sahrens return (EXDEV); 2628*fa9e4066Sahrens } 2629*fa9e4066Sahrens 2630*fa9e4066Sahrens szp = VTOZ(svp); 2631*fa9e4066Sahrens top: 2632*fa9e4066Sahrens /* 2633*fa9e4066Sahrens * We do not support links between attributes and non-attributes 2634*fa9e4066Sahrens * because of the potential security risk of creating links 2635*fa9e4066Sahrens * into "normal" file space in order to circumvent restrictions 2636*fa9e4066Sahrens * imposed in attribute space. 2637*fa9e4066Sahrens */ 2638*fa9e4066Sahrens if ((szp->z_phys->zp_flags & ZFS_XATTR) != 2639*fa9e4066Sahrens (dzp->z_phys->zp_flags & ZFS_XATTR)) { 2640*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2641*fa9e4066Sahrens return (EINVAL); 2642*fa9e4066Sahrens } 2643*fa9e4066Sahrens 2644*fa9e4066Sahrens /* 2645*fa9e4066Sahrens * POSIX dictates that we return EPERM here. 2646*fa9e4066Sahrens * Better choices include ENOTSUP or EISDIR. 2647*fa9e4066Sahrens */ 2648*fa9e4066Sahrens if (svp->v_type == VDIR) { 2649*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2650*fa9e4066Sahrens return (EPERM); 2651*fa9e4066Sahrens } 2652*fa9e4066Sahrens 2653*fa9e4066Sahrens if ((uid_t)szp->z_phys->zp_uid != crgetuid(cr) && 2654*fa9e4066Sahrens secpolicy_basic_link(cr) != 0) { 2655*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2656*fa9e4066Sahrens return (EPERM); 2657*fa9e4066Sahrens } 2658*fa9e4066Sahrens 2659*fa9e4066Sahrens if (error = zfs_zaccess(dzp, ACE_ADD_FILE, cr)) { 2660*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2661*fa9e4066Sahrens return (error); 2662*fa9e4066Sahrens } 2663*fa9e4066Sahrens 2664*fa9e4066Sahrens /* 2665*fa9e4066Sahrens * Attempt to lock directory; fail if entry already exists. 2666*fa9e4066Sahrens */ 2667*fa9e4066Sahrens if (error = zfs_dirent_lock(&dl, dzp, name, &tzp, ZNEW)) { 2668*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2669*fa9e4066Sahrens return (error); 2670*fa9e4066Sahrens } 2671*fa9e4066Sahrens 2672*fa9e4066Sahrens tx = dmu_tx_create(zfsvfs->z_os); 2673*fa9e4066Sahrens dmu_tx_hold_bonus(tx, szp->z_id); 2674*fa9e4066Sahrens dmu_tx_hold_zap(tx, dzp->z_id, 1); 2675*fa9e4066Sahrens error = dmu_tx_assign(tx, zfsvfs->z_assign); 2676*fa9e4066Sahrens if (error) { 2677*fa9e4066Sahrens dmu_tx_abort(tx); 2678*fa9e4066Sahrens zfs_dirent_unlock(dl); 2679*fa9e4066Sahrens if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { 2680*fa9e4066Sahrens txg_wait_open(dmu_objset_pool(zfsvfs->z_os), 0); 2681*fa9e4066Sahrens goto top; 2682*fa9e4066Sahrens } 2683*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2684*fa9e4066Sahrens return (error); 2685*fa9e4066Sahrens } 2686*fa9e4066Sahrens 2687*fa9e4066Sahrens error = zfs_link_create(dl, szp, tx, 0); 2688*fa9e4066Sahrens 2689*fa9e4066Sahrens if (error == 0) 2690*fa9e4066Sahrens seq = zfs_log_link(zilog, tx, TX_LINK, dzp, szp, name); 2691*fa9e4066Sahrens 2692*fa9e4066Sahrens dmu_tx_commit(tx); 2693*fa9e4066Sahrens 2694*fa9e4066Sahrens zfs_dirent_unlock(dl); 2695*fa9e4066Sahrens 2696*fa9e4066Sahrens zil_commit(zilog, seq, 0); 2697*fa9e4066Sahrens 2698*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2699*fa9e4066Sahrens return (error); 2700*fa9e4066Sahrens } 2701*fa9e4066Sahrens 2702*fa9e4066Sahrens /* 2703*fa9e4066Sahrens * zfs_null_putapage() is used when the file system has been force 2704*fa9e4066Sahrens * unmounted. It just drops the pages. 2705*fa9e4066Sahrens */ 2706*fa9e4066Sahrens /* ARGSUSED */ 2707*fa9e4066Sahrens static int 2708*fa9e4066Sahrens zfs_null_putapage(vnode_t *vp, page_t *pp, u_offset_t *offp, 2709*fa9e4066Sahrens size_t *lenp, int flags, cred_t *cr) 2710*fa9e4066Sahrens { 2711*fa9e4066Sahrens pvn_write_done(pp, B_INVAL|B_FORCE|B_ERROR); 2712*fa9e4066Sahrens return (0); 2713*fa9e4066Sahrens } 2714*fa9e4066Sahrens 2715*fa9e4066Sahrens /* ARGSUSED */ 2716*fa9e4066Sahrens static int 2717*fa9e4066Sahrens zfs_putapage(vnode_t *vp, page_t *pp, u_offset_t *offp, 2718*fa9e4066Sahrens size_t *lenp, int flags, cred_t *cr) 2719*fa9e4066Sahrens { 2720*fa9e4066Sahrens znode_t *zp = VTOZ(vp); 2721*fa9e4066Sahrens zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2722*fa9e4066Sahrens zilog_t *zilog = zfsvfs->z_log; 2723*fa9e4066Sahrens uint64_t seq = 0; 2724*fa9e4066Sahrens dmu_tx_t *tx; 2725*fa9e4066Sahrens u_offset_t off; 2726*fa9e4066Sahrens ssize_t len; 2727*fa9e4066Sahrens caddr_t va; 2728*fa9e4066Sahrens int err; 2729*fa9e4066Sahrens 2730*fa9e4066Sahrens top: 2731*fa9e4066Sahrens rw_enter(&zp->z_grow_lock, RW_READER); 2732*fa9e4066Sahrens 2733*fa9e4066Sahrens off = pp->p_offset; 2734*fa9e4066Sahrens len = MIN(PAGESIZE, zp->z_phys->zp_size - off); 2735*fa9e4066Sahrens 2736*fa9e4066Sahrens tx = dmu_tx_create(zfsvfs->z_os); 2737*fa9e4066Sahrens dmu_tx_hold_write(tx, zp->z_id, off, len); 2738*fa9e4066Sahrens dmu_tx_hold_bonus(tx, zp->z_id); 2739*fa9e4066Sahrens err = dmu_tx_assign(tx, zfsvfs->z_assign); 2740*fa9e4066Sahrens if (err != 0) { 2741*fa9e4066Sahrens dmu_tx_abort(tx); 2742*fa9e4066Sahrens rw_exit(&zp->z_grow_lock); 2743*fa9e4066Sahrens if (err == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { 2744*fa9e4066Sahrens txg_wait_open(dmu_objset_pool(zfsvfs->z_os), 0); 2745*fa9e4066Sahrens goto top; 2746*fa9e4066Sahrens } 2747*fa9e4066Sahrens goto out; 2748*fa9e4066Sahrens } 2749*fa9e4066Sahrens 2750*fa9e4066Sahrens va = ppmapin(pp, PROT_READ | PROT_WRITE, (caddr_t)-1); 2751*fa9e4066Sahrens 2752*fa9e4066Sahrens dmu_write(zfsvfs->z_os, zp->z_id, off, len, va, tx); 2753*fa9e4066Sahrens 2754*fa9e4066Sahrens ppmapout(va); 2755*fa9e4066Sahrens 2756*fa9e4066Sahrens zfs_time_stamper(zp, CONTENT_MODIFIED, tx); 2757*fa9e4066Sahrens seq = zfs_log_write(zilog, tx, TX_WRITE, zp, off, len, 0, NULL); 2758*fa9e4066Sahrens dmu_tx_commit(tx); 2759*fa9e4066Sahrens 2760*fa9e4066Sahrens rw_exit(&zp->z_grow_lock); 2761*fa9e4066Sahrens 2762*fa9e4066Sahrens pvn_write_done(pp, B_WRITE | flags); 2763*fa9e4066Sahrens if (offp) 2764*fa9e4066Sahrens *offp = off; 2765*fa9e4066Sahrens if (lenp) 2766*fa9e4066Sahrens *lenp = len; 2767*fa9e4066Sahrens 2768*fa9e4066Sahrens zil_commit(zilog, seq, 0); 2769*fa9e4066Sahrens out: 2770*fa9e4066Sahrens return (err); 2771*fa9e4066Sahrens } 2772*fa9e4066Sahrens 2773*fa9e4066Sahrens /* 2774*fa9e4066Sahrens * Copy the portion of the file indicated from pages into the file. 2775*fa9e4066Sahrens * The pages are stored in a page list attached to the files vnode. 2776*fa9e4066Sahrens * 2777*fa9e4066Sahrens * IN: vp - vnode of file to push page data to. 2778*fa9e4066Sahrens * off - position in file to put data. 2779*fa9e4066Sahrens * len - amount of data to write. 2780*fa9e4066Sahrens * flags - flags to control the operation. 2781*fa9e4066Sahrens * cr - credentials of caller. 2782*fa9e4066Sahrens * 2783*fa9e4066Sahrens * RETURN: 0 if success 2784*fa9e4066Sahrens * error code if failure 2785*fa9e4066Sahrens * 2786*fa9e4066Sahrens * Timestamps: 2787*fa9e4066Sahrens * vp - ctime|mtime updated 2788*fa9e4066Sahrens */ 2789*fa9e4066Sahrens static int 2790*fa9e4066Sahrens zfs_putpage(vnode_t *vp, offset_t off, size_t len, int flags, cred_t *cr) 2791*fa9e4066Sahrens { 2792*fa9e4066Sahrens znode_t *zp = VTOZ(vp); 2793*fa9e4066Sahrens zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2794*fa9e4066Sahrens page_t *pp; 2795*fa9e4066Sahrens size_t io_len; 2796*fa9e4066Sahrens u_offset_t io_off; 2797*fa9e4066Sahrens int error = 0; 2798*fa9e4066Sahrens 2799*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 2800*fa9e4066Sahrens 2801*fa9e4066Sahrens ASSERT(zp->z_dbuf_held && zp->z_phys); 2802*fa9e4066Sahrens 2803*fa9e4066Sahrens if (len == 0) { 2804*fa9e4066Sahrens /* 2805*fa9e4066Sahrens * Search the entire vp list for pages >= off. 2806*fa9e4066Sahrens */ 2807*fa9e4066Sahrens error = pvn_vplist_dirty(vp, (u_offset_t)off, zfs_putapage, 2808*fa9e4066Sahrens flags, cr); 2809*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2810*fa9e4066Sahrens return (error); 2811*fa9e4066Sahrens } 2812*fa9e4066Sahrens 2813*fa9e4066Sahrens if (off > zp->z_phys->zp_size) { 2814*fa9e4066Sahrens /* past end of file */ 2815*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2816*fa9e4066Sahrens return (0); 2817*fa9e4066Sahrens } 2818*fa9e4066Sahrens 2819*fa9e4066Sahrens len = MIN(len, zp->z_phys->zp_size - off); 2820*fa9e4066Sahrens 2821*fa9e4066Sahrens io_off = off; 2822*fa9e4066Sahrens while (io_off < off + len) { 2823*fa9e4066Sahrens if ((flags & B_INVAL) || ((flags & B_ASYNC) == 0)) { 2824*fa9e4066Sahrens pp = page_lookup(vp, io_off, 2825*fa9e4066Sahrens (flags & (B_INVAL | B_FREE)) ? 2826*fa9e4066Sahrens SE_EXCL : SE_SHARED); 2827*fa9e4066Sahrens } else { 2828*fa9e4066Sahrens pp = page_lookup_nowait(vp, io_off, 2829*fa9e4066Sahrens (flags & B_FREE) ? SE_EXCL : SE_SHARED); 2830*fa9e4066Sahrens } 2831*fa9e4066Sahrens 2832*fa9e4066Sahrens if (pp != NULL && pvn_getdirty(pp, flags)) { 2833*fa9e4066Sahrens int err; 2834*fa9e4066Sahrens 2835*fa9e4066Sahrens /* 2836*fa9e4066Sahrens * Found a dirty page to push 2837*fa9e4066Sahrens */ 2838*fa9e4066Sahrens if (err = 2839*fa9e4066Sahrens zfs_putapage(vp, pp, &io_off, &io_len, flags, cr)) 2840*fa9e4066Sahrens error = err; 2841*fa9e4066Sahrens } else { 2842*fa9e4066Sahrens io_len = PAGESIZE; 2843*fa9e4066Sahrens } 2844*fa9e4066Sahrens io_off += io_len; 2845*fa9e4066Sahrens } 2846*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2847*fa9e4066Sahrens return (error); 2848*fa9e4066Sahrens } 2849*fa9e4066Sahrens 2850*fa9e4066Sahrens void 2851*fa9e4066Sahrens zfs_inactive(vnode_t *vp, cred_t *cr) 2852*fa9e4066Sahrens { 2853*fa9e4066Sahrens znode_t *zp = VTOZ(vp); 2854*fa9e4066Sahrens zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2855*fa9e4066Sahrens int error; 2856*fa9e4066Sahrens 2857*fa9e4066Sahrens rw_enter(&zfsvfs->z_um_lock, RW_READER); 2858*fa9e4066Sahrens if (zfsvfs->z_unmounted2) { 2859*fa9e4066Sahrens ASSERT(zp->z_dbuf_held == 0); 2860*fa9e4066Sahrens 2861*fa9e4066Sahrens if (vn_has_cached_data(vp)) { 2862*fa9e4066Sahrens (void) pvn_vplist_dirty(vp, 0, zfs_null_putapage, 2863*fa9e4066Sahrens B_INVAL, cr); 2864*fa9e4066Sahrens } 2865*fa9e4066Sahrens 2866*fa9e4066Sahrens vp->v_count = 0; /* count arrives as 1 */ 2867*fa9e4066Sahrens zfs_znode_free(zp); 2868*fa9e4066Sahrens rw_exit(&zfsvfs->z_um_lock); 2869*fa9e4066Sahrens VFS_RELE(zfsvfs->z_vfs); 2870*fa9e4066Sahrens return; 2871*fa9e4066Sahrens } 2872*fa9e4066Sahrens 2873*fa9e4066Sahrens /* 2874*fa9e4066Sahrens * Attempt to push any data in the page cache. If this fails 2875*fa9e4066Sahrens * we will get kicked out later in zfs_zinactive(). 2876*fa9e4066Sahrens */ 2877*fa9e4066Sahrens if (vn_has_cached_data(vp)) 2878*fa9e4066Sahrens (void) pvn_vplist_dirty(vp, 0, zfs_putapage, B_INVAL, cr); 2879*fa9e4066Sahrens 2880*fa9e4066Sahrens if (zp->z_atime_dirty && zp->z_reap == 0) { 2881*fa9e4066Sahrens dmu_tx_t *tx = dmu_tx_create(zfsvfs->z_os); 2882*fa9e4066Sahrens 2883*fa9e4066Sahrens dmu_tx_hold_bonus(tx, zp->z_id); 2884*fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 2885*fa9e4066Sahrens if (error) { 2886*fa9e4066Sahrens dmu_tx_abort(tx); 2887*fa9e4066Sahrens } else { 2888*fa9e4066Sahrens dmu_buf_will_dirty(zp->z_dbuf, tx); 2889*fa9e4066Sahrens mutex_enter(&zp->z_lock); 2890*fa9e4066Sahrens zp->z_atime_dirty = 0; 2891*fa9e4066Sahrens mutex_exit(&zp->z_lock); 2892*fa9e4066Sahrens dmu_tx_commit(tx); 2893*fa9e4066Sahrens } 2894*fa9e4066Sahrens } 2895*fa9e4066Sahrens 2896*fa9e4066Sahrens zfs_zinactive(zp); 2897*fa9e4066Sahrens rw_exit(&zfsvfs->z_um_lock); 2898*fa9e4066Sahrens } 2899*fa9e4066Sahrens 2900*fa9e4066Sahrens /* 2901*fa9e4066Sahrens * Bounds-check the seek operation. 2902*fa9e4066Sahrens * 2903*fa9e4066Sahrens * IN: vp - vnode seeking within 2904*fa9e4066Sahrens * ooff - old file offset 2905*fa9e4066Sahrens * noffp - pointer to new file offset 2906*fa9e4066Sahrens * 2907*fa9e4066Sahrens * RETURN: 0 if success 2908*fa9e4066Sahrens * EINVAL if new offset invalid 2909*fa9e4066Sahrens */ 2910*fa9e4066Sahrens /* ARGSUSED */ 2911*fa9e4066Sahrens static int 2912*fa9e4066Sahrens zfs_seek(vnode_t *vp, offset_t ooff, offset_t *noffp) 2913*fa9e4066Sahrens { 2914*fa9e4066Sahrens if (vp->v_type == VDIR) 2915*fa9e4066Sahrens return (0); 2916*fa9e4066Sahrens return ((*noffp < 0 || *noffp > MAXOFFSET_T) ? EINVAL : 0); 2917*fa9e4066Sahrens } 2918*fa9e4066Sahrens 2919*fa9e4066Sahrens /* 2920*fa9e4066Sahrens * Pre-filter the generic locking function to trap attempts to place 2921*fa9e4066Sahrens * a mandatory lock on a memory mapped file. 2922*fa9e4066Sahrens */ 2923*fa9e4066Sahrens static int 2924*fa9e4066Sahrens zfs_frlock(vnode_t *vp, int cmd, flock64_t *bfp, int flag, offset_t offset, 2925*fa9e4066Sahrens flk_callback_t *flk_cbp, cred_t *cr) 2926*fa9e4066Sahrens { 2927*fa9e4066Sahrens znode_t *zp = VTOZ(vp); 2928*fa9e4066Sahrens zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2929*fa9e4066Sahrens uint_t cnt = 1; 2930*fa9e4066Sahrens int error; 2931*fa9e4066Sahrens 2932*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 2933*fa9e4066Sahrens 2934*fa9e4066Sahrens /* 2935*fa9e4066Sahrens * If file is being mapped, disallow frlock. We set the mapcnt to 2936*fa9e4066Sahrens * -1 here to signal that we are in the process of setting a lock. 2937*fa9e4066Sahrens * This prevents a race with zfs_map(). 2938*fa9e4066Sahrens * XXX - well, sort of; since zfs_map() does not change z_mapcnt, 2939*fa9e4066Sahrens * we could be in the middle of zfs_map() and still call fs_frlock(). 2940*fa9e4066Sahrens * Also, we are doing no checking in zfs_addmap() (where z_mapcnt 2941*fa9e4066Sahrens * *is* manipulated). 2942*fa9e4066Sahrens */ 2943*fa9e4066Sahrens if (MANDMODE((mode_t)zp->z_phys->zp_mode) && 2944*fa9e4066Sahrens (int)(cnt = atomic_cas_32(&zp->z_mapcnt, 0, -1)) > 0) { 2945*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2946*fa9e4066Sahrens return (EAGAIN); 2947*fa9e4066Sahrens } 2948*fa9e4066Sahrens error = fs_frlock(vp, cmd, bfp, flag, offset, flk_cbp, cr); 2949*fa9e4066Sahrens ASSERT((cnt != 0) || ((int)atomic_cas_32(&zp->z_mapcnt, -1, 0) == -1)); 2950*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 2951*fa9e4066Sahrens return (error); 2952*fa9e4066Sahrens } 2953*fa9e4066Sahrens 2954*fa9e4066Sahrens /* 2955*fa9e4066Sahrens * If we can't find a page in the cache, we will create a new page 2956*fa9e4066Sahrens * and fill it with file data. For efficiency, we may try to fill 2957*fa9e4066Sahrens * multiple pages as once (klustering). 2958*fa9e4066Sahrens */ 2959*fa9e4066Sahrens static int 2960*fa9e4066Sahrens zfs_fillpage(vnode_t *vp, u_offset_t off, struct seg *seg, 2961*fa9e4066Sahrens caddr_t addr, page_t *pl[], size_t plsz, enum seg_rw rw) 2962*fa9e4066Sahrens { 2963*fa9e4066Sahrens znode_t *zp = VTOZ(vp); 2964*fa9e4066Sahrens page_t *pp, *cur_pp; 2965*fa9e4066Sahrens objset_t *os = zp->z_zfsvfs->z_os; 2966*fa9e4066Sahrens caddr_t va; 2967*fa9e4066Sahrens u_offset_t io_off, total; 2968*fa9e4066Sahrens uint64_t oid = zp->z_id; 2969*fa9e4066Sahrens size_t io_len; 2970*fa9e4066Sahrens int err; 2971*fa9e4066Sahrens 2972*fa9e4066Sahrens /* 2973*fa9e4066Sahrens * If we are only asking for a single page don't bother klustering. 2974*fa9e4066Sahrens */ 2975*fa9e4066Sahrens if (plsz == PAGESIZE || zp->z_blksz <= PAGESIZE || 2976*fa9e4066Sahrens off > zp->z_phys->zp_size) { 2977*fa9e4066Sahrens io_off = off; 2978*fa9e4066Sahrens io_len = PAGESIZE; 2979*fa9e4066Sahrens pp = page_create_va(vp, io_off, io_len, PG_WAIT, seg, addr); 2980*fa9e4066Sahrens } else { 2981*fa9e4066Sahrens /* 2982*fa9e4066Sahrens * Try to fill a kluster of pages (a blocks worth). 2983*fa9e4066Sahrens */ 2984*fa9e4066Sahrens size_t klen; 2985*fa9e4066Sahrens u_offset_t koff; 2986*fa9e4066Sahrens 2987*fa9e4066Sahrens if (!ISP2(zp->z_blksz)) { 2988*fa9e4066Sahrens /* Only one block in the file. */ 2989*fa9e4066Sahrens klen = P2ROUNDUP((ulong_t)zp->z_blksz, PAGESIZE); 2990*fa9e4066Sahrens koff = 0; 2991*fa9e4066Sahrens } else { 2992*fa9e4066Sahrens klen = plsz; 2993*fa9e4066Sahrens koff = P2ALIGN(off, (u_offset_t)klen); 2994*fa9e4066Sahrens } 2995*fa9e4066Sahrens if (klen > zp->z_phys->zp_size) 2996*fa9e4066Sahrens klen = P2ROUNDUP(zp->z_phys->zp_size, 2997*fa9e4066Sahrens (uint64_t)PAGESIZE); 2998*fa9e4066Sahrens pp = pvn_read_kluster(vp, off, seg, addr, &io_off, 2999*fa9e4066Sahrens &io_len, koff, klen, 0); 3000*fa9e4066Sahrens } 3001*fa9e4066Sahrens if (pp == NULL) { 3002*fa9e4066Sahrens /* 3003*fa9e4066Sahrens * Some other thread entered the page before us. 3004*fa9e4066Sahrens * Return to zfs_getpage to retry the lookup. 3005*fa9e4066Sahrens */ 3006*fa9e4066Sahrens *pl = NULL; 3007*fa9e4066Sahrens return (0); 3008*fa9e4066Sahrens } 3009*fa9e4066Sahrens 3010*fa9e4066Sahrens /* 3011*fa9e4066Sahrens * Fill the pages in the kluster. 3012*fa9e4066Sahrens */ 3013*fa9e4066Sahrens cur_pp = pp; 3014*fa9e4066Sahrens for (total = io_off + io_len; io_off < total; io_off += PAGESIZE) { 3015*fa9e4066Sahrens ASSERT(io_off == cur_pp->p_offset); 3016*fa9e4066Sahrens va = ppmapin(cur_pp, PROT_READ | PROT_WRITE, (caddr_t)-1); 3017*fa9e4066Sahrens err = dmu_read_canfail(os, oid, io_off, PAGESIZE, va); 3018*fa9e4066Sahrens ppmapout(va); 3019*fa9e4066Sahrens if (err) { 3020*fa9e4066Sahrens /* On error, toss the entire kluster */ 3021*fa9e4066Sahrens pvn_read_done(pp, B_ERROR); 3022*fa9e4066Sahrens return (err); 3023*fa9e4066Sahrens } 3024*fa9e4066Sahrens cur_pp = cur_pp->p_next; 3025*fa9e4066Sahrens } 3026*fa9e4066Sahrens out: 3027*fa9e4066Sahrens /* 3028*fa9e4066Sahrens * Fill in the page list array from the kluster. If 3029*fa9e4066Sahrens * there are too many pages in the kluster, return 3030*fa9e4066Sahrens * as many pages as possible starting from the desired 3031*fa9e4066Sahrens * offset `off'. 3032*fa9e4066Sahrens * NOTE: the page list will always be null terminated. 3033*fa9e4066Sahrens */ 3034*fa9e4066Sahrens pvn_plist_init(pp, pl, plsz, off, io_len, rw); 3035*fa9e4066Sahrens 3036*fa9e4066Sahrens return (0); 3037*fa9e4066Sahrens } 3038*fa9e4066Sahrens 3039*fa9e4066Sahrens /* 3040*fa9e4066Sahrens * Return pointers to the pages for the file region [off, off + len] 3041*fa9e4066Sahrens * in the pl array. If plsz is greater than len, this function may 3042*fa9e4066Sahrens * also return page pointers from before or after the specified 3043*fa9e4066Sahrens * region (i.e. some region [off', off' + plsz]). These additional 3044*fa9e4066Sahrens * pages are only returned if they are already in the cache, or were 3045*fa9e4066Sahrens * created as part of a klustered read. 3046*fa9e4066Sahrens * 3047*fa9e4066Sahrens * IN: vp - vnode of file to get data from. 3048*fa9e4066Sahrens * off - position in file to get data from. 3049*fa9e4066Sahrens * len - amount of data to retrieve. 3050*fa9e4066Sahrens * plsz - length of provided page list. 3051*fa9e4066Sahrens * seg - segment to obtain pages for. 3052*fa9e4066Sahrens * addr - virtual address of fault. 3053*fa9e4066Sahrens * rw - mode of created pages. 3054*fa9e4066Sahrens * cr - credentials of caller. 3055*fa9e4066Sahrens * 3056*fa9e4066Sahrens * OUT: protp - protection mode of created pages. 3057*fa9e4066Sahrens * pl - list of pages created. 3058*fa9e4066Sahrens * 3059*fa9e4066Sahrens * RETURN: 0 if success 3060*fa9e4066Sahrens * error code if failure 3061*fa9e4066Sahrens * 3062*fa9e4066Sahrens * Timestamps: 3063*fa9e4066Sahrens * vp - atime updated 3064*fa9e4066Sahrens */ 3065*fa9e4066Sahrens /* ARGSUSED */ 3066*fa9e4066Sahrens static int 3067*fa9e4066Sahrens zfs_getpage(vnode_t *vp, offset_t off, size_t len, uint_t *protp, 3068*fa9e4066Sahrens page_t *pl[], size_t plsz, struct seg *seg, caddr_t addr, 3069*fa9e4066Sahrens enum seg_rw rw, cred_t *cr) 3070*fa9e4066Sahrens { 3071*fa9e4066Sahrens znode_t *zp = VTOZ(vp); 3072*fa9e4066Sahrens zfsvfs_t *zfsvfs = zp->z_zfsvfs; 3073*fa9e4066Sahrens page_t *pp, **pl0 = pl; 3074*fa9e4066Sahrens int cnt = 0, need_unlock = 0, err = 0; 3075*fa9e4066Sahrens 3076*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 3077*fa9e4066Sahrens 3078*fa9e4066Sahrens if (protp) 3079*fa9e4066Sahrens *protp = PROT_ALL; 3080*fa9e4066Sahrens 3081*fa9e4066Sahrens ASSERT(zp->z_dbuf_held && zp->z_phys); 3082*fa9e4066Sahrens 3083*fa9e4066Sahrens /* no faultahead (for now) */ 3084*fa9e4066Sahrens if (pl == NULL) { 3085*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 3086*fa9e4066Sahrens return (0); 3087*fa9e4066Sahrens } 3088*fa9e4066Sahrens 3089*fa9e4066Sahrens /* can't fault past EOF */ 3090*fa9e4066Sahrens if (off >= zp->z_phys->zp_size) { 3091*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 3092*fa9e4066Sahrens return (EFAULT); 3093*fa9e4066Sahrens } 3094*fa9e4066Sahrens 3095*fa9e4066Sahrens /* 3096*fa9e4066Sahrens * Make sure nobody restructures the file (changes block size) 3097*fa9e4066Sahrens * in the middle of the getpage. 3098*fa9e4066Sahrens */ 3099*fa9e4066Sahrens rw_enter(&zp->z_grow_lock, RW_READER); 3100*fa9e4066Sahrens 3101*fa9e4066Sahrens /* 3102*fa9e4066Sahrens * If we already own the lock, then we must be page faulting 3103*fa9e4066Sahrens * in the middle of a write to this file (i.e., we are writing 3104*fa9e4066Sahrens * to this file using data from a mapped region of the file). 3105*fa9e4066Sahrens */ 3106*fa9e4066Sahrens if (!rw_owner(&zp->z_map_lock)) { 3107*fa9e4066Sahrens rw_enter(&zp->z_map_lock, RW_WRITER); 3108*fa9e4066Sahrens need_unlock = TRUE; 3109*fa9e4066Sahrens } 3110*fa9e4066Sahrens 3111*fa9e4066Sahrens /* 3112*fa9e4066Sahrens * Loop through the requested range [off, off + len] looking 3113*fa9e4066Sahrens * for pages. If we don't find a page, we will need to create 3114*fa9e4066Sahrens * a new page and fill it with data from the file. 3115*fa9e4066Sahrens */ 3116*fa9e4066Sahrens while (len > 0) { 3117*fa9e4066Sahrens if (plsz < PAGESIZE) 3118*fa9e4066Sahrens break; 3119*fa9e4066Sahrens if (pp = page_lookup(vp, off, SE_SHARED)) { 3120*fa9e4066Sahrens *pl++ = pp; 3121*fa9e4066Sahrens off += PAGESIZE; 3122*fa9e4066Sahrens addr += PAGESIZE; 3123*fa9e4066Sahrens len -= PAGESIZE; 3124*fa9e4066Sahrens plsz -= PAGESIZE; 3125*fa9e4066Sahrens } else { 3126*fa9e4066Sahrens err = zfs_fillpage(vp, off, seg, addr, pl, plsz, rw); 3127*fa9e4066Sahrens /* 3128*fa9e4066Sahrens * klustering may have changed our region 3129*fa9e4066Sahrens * to be block aligned. 3130*fa9e4066Sahrens */ 3131*fa9e4066Sahrens if (((pp = *pl) != 0) && (off != pp->p_offset)) { 3132*fa9e4066Sahrens int delta = off - pp->p_offset; 3133*fa9e4066Sahrens len += delta; 3134*fa9e4066Sahrens off -= delta; 3135*fa9e4066Sahrens addr -= delta; 3136*fa9e4066Sahrens } 3137*fa9e4066Sahrens while (*pl) { 3138*fa9e4066Sahrens pl++; 3139*fa9e4066Sahrens cnt++; 3140*fa9e4066Sahrens off += PAGESIZE; 3141*fa9e4066Sahrens addr += PAGESIZE; 3142*fa9e4066Sahrens plsz -= PAGESIZE; 3143*fa9e4066Sahrens if (len > PAGESIZE) 3144*fa9e4066Sahrens len -= PAGESIZE; 3145*fa9e4066Sahrens else 3146*fa9e4066Sahrens len = 0; 3147*fa9e4066Sahrens } 3148*fa9e4066Sahrens } 3149*fa9e4066Sahrens if (err) 3150*fa9e4066Sahrens goto out; 3151*fa9e4066Sahrens } 3152*fa9e4066Sahrens 3153*fa9e4066Sahrens /* 3154*fa9e4066Sahrens * Fill out the page array with any pages already in the cache. 3155*fa9e4066Sahrens */ 3156*fa9e4066Sahrens while (plsz > 0) { 3157*fa9e4066Sahrens pp = page_lookup_nowait(vp, off, SE_SHARED); 3158*fa9e4066Sahrens if (pp == NULL) 3159*fa9e4066Sahrens break; 3160*fa9e4066Sahrens *pl++ = pp; 3161*fa9e4066Sahrens off += PAGESIZE; 3162*fa9e4066Sahrens plsz -= PAGESIZE; 3163*fa9e4066Sahrens } 3164*fa9e4066Sahrens 3165*fa9e4066Sahrens ZFS_ACCESSTIME_STAMP(zfsvfs, zp); 3166*fa9e4066Sahrens out: 3167*fa9e4066Sahrens if (err) { 3168*fa9e4066Sahrens /* 3169*fa9e4066Sahrens * Release any pages we have locked. 3170*fa9e4066Sahrens */ 3171*fa9e4066Sahrens while (pl > pl0) 3172*fa9e4066Sahrens page_unlock(*--pl); 3173*fa9e4066Sahrens } 3174*fa9e4066Sahrens *pl = NULL; 3175*fa9e4066Sahrens 3176*fa9e4066Sahrens if (need_unlock) 3177*fa9e4066Sahrens rw_exit(&zp->z_map_lock); 3178*fa9e4066Sahrens rw_exit(&zp->z_grow_lock); 3179*fa9e4066Sahrens 3180*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 3181*fa9e4066Sahrens return (err); 3182*fa9e4066Sahrens } 3183*fa9e4066Sahrens 3184*fa9e4066Sahrens static int 3185*fa9e4066Sahrens zfs_map(vnode_t *vp, offset_t off, struct as *as, caddr_t *addrp, 3186*fa9e4066Sahrens size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, cred_t *cr) 3187*fa9e4066Sahrens { 3188*fa9e4066Sahrens znode_t *zp = VTOZ(vp); 3189*fa9e4066Sahrens zfsvfs_t *zfsvfs = zp->z_zfsvfs; 3190*fa9e4066Sahrens segvn_crargs_t vn_a; 3191*fa9e4066Sahrens int error; 3192*fa9e4066Sahrens 3193*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 3194*fa9e4066Sahrens 3195*fa9e4066Sahrens if (vp->v_flag & VNOMAP) { 3196*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 3197*fa9e4066Sahrens return (ENOSYS); 3198*fa9e4066Sahrens } 3199*fa9e4066Sahrens 3200*fa9e4066Sahrens if (off < 0 || len > MAXOFFSET_T - off) { 3201*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 3202*fa9e4066Sahrens return (ENXIO); 3203*fa9e4066Sahrens } 3204*fa9e4066Sahrens 3205*fa9e4066Sahrens if (vp->v_type != VREG) { 3206*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 3207*fa9e4066Sahrens return (ENODEV); 3208*fa9e4066Sahrens } 3209*fa9e4066Sahrens 3210*fa9e4066Sahrens /* 3211*fa9e4066Sahrens * If file is locked, disallow mapping. 3212*fa9e4066Sahrens * XXX - since we don't modify z_mapcnt here, there is nothing 3213*fa9e4066Sahrens * to stop a file lock being placed immediately after we complete 3214*fa9e4066Sahrens * this check. 3215*fa9e4066Sahrens */ 3216*fa9e4066Sahrens if (MANDMODE((mode_t)zp->z_phys->zp_mode)) { 3217*fa9e4066Sahrens if (vn_has_flocks(vp) || zp->z_mapcnt == -1) { 3218*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 3219*fa9e4066Sahrens return (EAGAIN); 3220*fa9e4066Sahrens } 3221*fa9e4066Sahrens } 3222*fa9e4066Sahrens 3223*fa9e4066Sahrens as_rangelock(as); 3224*fa9e4066Sahrens if ((flags & MAP_FIXED) == 0) { 3225*fa9e4066Sahrens map_addr(addrp, len, off, 1, flags); 3226*fa9e4066Sahrens if (*addrp == NULL) { 3227*fa9e4066Sahrens as_rangeunlock(as); 3228*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 3229*fa9e4066Sahrens return (ENOMEM); 3230*fa9e4066Sahrens } 3231*fa9e4066Sahrens } else { 3232*fa9e4066Sahrens /* 3233*fa9e4066Sahrens * User specified address - blow away any previous mappings 3234*fa9e4066Sahrens */ 3235*fa9e4066Sahrens (void) as_unmap(as, *addrp, len); 3236*fa9e4066Sahrens } 3237*fa9e4066Sahrens 3238*fa9e4066Sahrens vn_a.vp = vp; 3239*fa9e4066Sahrens vn_a.offset = (u_offset_t)off; 3240*fa9e4066Sahrens vn_a.type = flags & MAP_TYPE; 3241*fa9e4066Sahrens vn_a.prot = prot; 3242*fa9e4066Sahrens vn_a.maxprot = maxprot; 3243*fa9e4066Sahrens vn_a.cred = cr; 3244*fa9e4066Sahrens vn_a.amp = NULL; 3245*fa9e4066Sahrens vn_a.flags = flags & ~MAP_TYPE; 3246*fa9e4066Sahrens 3247*fa9e4066Sahrens error = as_map(as, *addrp, len, segvn_create, &vn_a); 3248*fa9e4066Sahrens 3249*fa9e4066Sahrens as_rangeunlock(as); 3250*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 3251*fa9e4066Sahrens return (error); 3252*fa9e4066Sahrens } 3253*fa9e4066Sahrens 3254*fa9e4066Sahrens /* ARGSUSED */ 3255*fa9e4066Sahrens static int 3256*fa9e4066Sahrens zfs_addmap(vnode_t *vp, offset_t off, struct as *as, caddr_t addr, 3257*fa9e4066Sahrens size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, cred_t *cr) 3258*fa9e4066Sahrens { 3259*fa9e4066Sahrens /* 3260*fa9e4066Sahrens * XXX - shouldn't we be checking for file locks here? 3261*fa9e4066Sahrens */ 3262*fa9e4066Sahrens ASSERT3U(VTOZ(vp)->z_mapcnt, >=, 0); 3263*fa9e4066Sahrens atomic_add_32(&VTOZ(vp)->z_mapcnt, btopr(len)); 3264*fa9e4066Sahrens return (0); 3265*fa9e4066Sahrens } 3266*fa9e4066Sahrens 3267*fa9e4066Sahrens /* ARGSUSED */ 3268*fa9e4066Sahrens static int 3269*fa9e4066Sahrens zfs_delmap(vnode_t *vp, offset_t off, struct as *as, caddr_t addr, 3270*fa9e4066Sahrens size_t len, uint_t prot, uint_t maxprot, uint_t flags, cred_t *cr) 3271*fa9e4066Sahrens { 3272*fa9e4066Sahrens atomic_add_32(&VTOZ(vp)->z_mapcnt, -btopr(len)); 3273*fa9e4066Sahrens ASSERT3U(VTOZ(vp)->z_mapcnt, >=, 0); 3274*fa9e4066Sahrens return (0); 3275*fa9e4066Sahrens } 3276*fa9e4066Sahrens 3277*fa9e4066Sahrens /* 3278*fa9e4066Sahrens * Free or allocate space in a file. Currently, this function only 3279*fa9e4066Sahrens * supports the `F_FREESP' command. However, this command is somewhat 3280*fa9e4066Sahrens * misnamed, as its functionality includes the ability to allocate as 3281*fa9e4066Sahrens * well as free space. 3282*fa9e4066Sahrens * 3283*fa9e4066Sahrens * IN: vp - vnode of file to free data in. 3284*fa9e4066Sahrens * cmd - action to take (only F_FREESP supported). 3285*fa9e4066Sahrens * bfp - section of file to free/alloc. 3286*fa9e4066Sahrens * flag - current file open mode flags. 3287*fa9e4066Sahrens * offset - current file offset. 3288*fa9e4066Sahrens * cr - credentials of caller [UNUSED]. 3289*fa9e4066Sahrens * 3290*fa9e4066Sahrens * RETURN: 0 if success 3291*fa9e4066Sahrens * error code if failure 3292*fa9e4066Sahrens * 3293*fa9e4066Sahrens * Timestamps: 3294*fa9e4066Sahrens * vp - ctime|mtime updated 3295*fa9e4066Sahrens * 3296*fa9e4066Sahrens * NOTE: This function is limited in that it will only permit space to 3297*fa9e4066Sahrens * be freed at the end of a file. In essence, this function simply 3298*fa9e4066Sahrens * allows one to set the file size. 3299*fa9e4066Sahrens */ 3300*fa9e4066Sahrens /* ARGSUSED */ 3301*fa9e4066Sahrens static int 3302*fa9e4066Sahrens zfs_space(vnode_t *vp, int cmd, flock64_t *bfp, int flag, 3303*fa9e4066Sahrens offset_t offset, cred_t *cr, caller_context_t *ct) 3304*fa9e4066Sahrens { 3305*fa9e4066Sahrens dmu_tx_t *tx; 3306*fa9e4066Sahrens znode_t *zp = VTOZ(vp); 3307*fa9e4066Sahrens zfsvfs_t *zfsvfs = zp->z_zfsvfs; 3308*fa9e4066Sahrens zilog_t *zilog = zfsvfs->z_log; 3309*fa9e4066Sahrens uint64_t seq = 0; 3310*fa9e4066Sahrens uint64_t off, len; 3311*fa9e4066Sahrens int error; 3312*fa9e4066Sahrens 3313*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 3314*fa9e4066Sahrens 3315*fa9e4066Sahrens top: 3316*fa9e4066Sahrens if (cmd != F_FREESP) { 3317*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 3318*fa9e4066Sahrens return (EINVAL); 3319*fa9e4066Sahrens } 3320*fa9e4066Sahrens 3321*fa9e4066Sahrens if (error = convoff(vp, bfp, 0, offset)) { 3322*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 3323*fa9e4066Sahrens return (error); 3324*fa9e4066Sahrens } 3325*fa9e4066Sahrens 3326*fa9e4066Sahrens if (bfp->l_len < 0) { 3327*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 3328*fa9e4066Sahrens return (EINVAL); 3329*fa9e4066Sahrens } 3330*fa9e4066Sahrens 3331*fa9e4066Sahrens off = bfp->l_start; 3332*fa9e4066Sahrens len = bfp->l_len; 3333*fa9e4066Sahrens tx = dmu_tx_create(zfsvfs->z_os); 3334*fa9e4066Sahrens /* 3335*fa9e4066Sahrens * Grab the grow_lock to serialize this change with 3336*fa9e4066Sahrens * respect to other file size changes. 3337*fa9e4066Sahrens */ 3338*fa9e4066Sahrens dmu_tx_hold_bonus(tx, zp->z_id); 3339*fa9e4066Sahrens rw_enter(&zp->z_grow_lock, RW_WRITER); 3340*fa9e4066Sahrens if (off + len > zp->z_blksz && zp->z_blksz < zfsvfs->z_max_blksz && 3341*fa9e4066Sahrens off >= zp->z_phys->zp_size) { 3342*fa9e4066Sahrens /* 3343*fa9e4066Sahrens * We are increasing the length of the file, 3344*fa9e4066Sahrens * and this may mean a block size increase. 3345*fa9e4066Sahrens */ 3346*fa9e4066Sahrens dmu_tx_hold_write(tx, zp->z_id, 0, 3347*fa9e4066Sahrens MIN(off + len, zfsvfs->z_max_blksz)); 3348*fa9e4066Sahrens } else if (off < zp->z_phys->zp_size) { 3349*fa9e4066Sahrens /* 3350*fa9e4066Sahrens * If len == 0, we are truncating the file. 3351*fa9e4066Sahrens */ 3352*fa9e4066Sahrens dmu_tx_hold_free(tx, zp->z_id, off, len ? len : DMU_OBJECT_END); 3353*fa9e4066Sahrens } 3354*fa9e4066Sahrens 3355*fa9e4066Sahrens error = dmu_tx_assign(tx, zfsvfs->z_assign); 3356*fa9e4066Sahrens if (error) { 3357*fa9e4066Sahrens dmu_tx_abort(tx); 3358*fa9e4066Sahrens rw_exit(&zp->z_grow_lock); 3359*fa9e4066Sahrens if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) { 3360*fa9e4066Sahrens txg_wait_open(dmu_objset_pool(zfsvfs->z_os), 0); 3361*fa9e4066Sahrens goto top; 3362*fa9e4066Sahrens } 3363*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 3364*fa9e4066Sahrens return (error); 3365*fa9e4066Sahrens } 3366*fa9e4066Sahrens 3367*fa9e4066Sahrens error = zfs_freesp(zp, off, len, flag, tx, cr); 3368*fa9e4066Sahrens 3369*fa9e4066Sahrens if (error == 0) { 3370*fa9e4066Sahrens zfs_time_stamper(zp, CONTENT_MODIFIED, tx); 3371*fa9e4066Sahrens seq = zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len); 3372*fa9e4066Sahrens } 3373*fa9e4066Sahrens 3374*fa9e4066Sahrens rw_exit(&zp->z_grow_lock); 3375*fa9e4066Sahrens 3376*fa9e4066Sahrens dmu_tx_commit(tx); 3377*fa9e4066Sahrens 3378*fa9e4066Sahrens zil_commit(zilog, seq, 0); 3379*fa9e4066Sahrens 3380*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 3381*fa9e4066Sahrens return (error); 3382*fa9e4066Sahrens } 3383*fa9e4066Sahrens 3384*fa9e4066Sahrens static int 3385*fa9e4066Sahrens zfs_fid(vnode_t *vp, fid_t *fidp) 3386*fa9e4066Sahrens { 3387*fa9e4066Sahrens znode_t *zp = VTOZ(vp); 3388*fa9e4066Sahrens zfsvfs_t *zfsvfs = zp->z_zfsvfs; 3389*fa9e4066Sahrens uint32_t gen = (uint32_t)zp->z_phys->zp_gen; 3390*fa9e4066Sahrens uint64_t object = zp->z_id; 3391*fa9e4066Sahrens zfid_short_t *zfid; 3392*fa9e4066Sahrens int size, i; 3393*fa9e4066Sahrens 3394*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 3395*fa9e4066Sahrens 3396*fa9e4066Sahrens size = (zfsvfs->z_parent != zfsvfs) ? LONG_FID_LEN : SHORT_FID_LEN; 3397*fa9e4066Sahrens if (fidp->fid_len < size) { 3398*fa9e4066Sahrens fidp->fid_len = size; 3399*fa9e4066Sahrens return (ENOSPC); 3400*fa9e4066Sahrens } 3401*fa9e4066Sahrens 3402*fa9e4066Sahrens zfid = (zfid_short_t *)fidp; 3403*fa9e4066Sahrens 3404*fa9e4066Sahrens zfid->zf_len = size; 3405*fa9e4066Sahrens 3406*fa9e4066Sahrens for (i = 0; i < sizeof (zfid->zf_object); i++) 3407*fa9e4066Sahrens zfid->zf_object[i] = (uint8_t)(object >> (8 * i)); 3408*fa9e4066Sahrens 3409*fa9e4066Sahrens /* Must have a non-zero generation number to distinguish from .zfs */ 3410*fa9e4066Sahrens if (gen == 0) 3411*fa9e4066Sahrens gen = 1; 3412*fa9e4066Sahrens for (i = 0; i < sizeof (zfid->zf_gen); i++) 3413*fa9e4066Sahrens zfid->zf_gen[i] = (uint8_t)(gen >> (8 * i)); 3414*fa9e4066Sahrens 3415*fa9e4066Sahrens if (size == LONG_FID_LEN) { 3416*fa9e4066Sahrens uint64_t objsetid = dmu_objset_id(zfsvfs->z_os); 3417*fa9e4066Sahrens zfid_long_t *zlfid; 3418*fa9e4066Sahrens 3419*fa9e4066Sahrens zlfid = (zfid_long_t *)fidp; 3420*fa9e4066Sahrens 3421*fa9e4066Sahrens for (i = 0; i < sizeof (zlfid->zf_setid); i++) 3422*fa9e4066Sahrens zlfid->zf_setid[i] = (uint8_t)(objsetid >> (8 * i)); 3423*fa9e4066Sahrens 3424*fa9e4066Sahrens /* XXX - this should be the generation number for the objset */ 3425*fa9e4066Sahrens for (i = 0; i < sizeof (zlfid->zf_setgen); i++) 3426*fa9e4066Sahrens zlfid->zf_setgen[i] = 0; 3427*fa9e4066Sahrens } 3428*fa9e4066Sahrens 3429*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 3430*fa9e4066Sahrens return (0); 3431*fa9e4066Sahrens } 3432*fa9e4066Sahrens 3433*fa9e4066Sahrens static int 3434*fa9e4066Sahrens zfs_pathconf(vnode_t *vp, int cmd, ulong_t *valp, cred_t *cr) 3435*fa9e4066Sahrens { 3436*fa9e4066Sahrens znode_t *zp, *xzp; 3437*fa9e4066Sahrens zfsvfs_t *zfsvfs; 3438*fa9e4066Sahrens zfs_dirlock_t *dl; 3439*fa9e4066Sahrens int error; 3440*fa9e4066Sahrens 3441*fa9e4066Sahrens switch (cmd) { 3442*fa9e4066Sahrens case _PC_LINK_MAX: 3443*fa9e4066Sahrens *valp = ULONG_MAX; 3444*fa9e4066Sahrens return (0); 3445*fa9e4066Sahrens 3446*fa9e4066Sahrens case _PC_FILESIZEBITS: 3447*fa9e4066Sahrens *valp = 64; 3448*fa9e4066Sahrens return (0); 3449*fa9e4066Sahrens 3450*fa9e4066Sahrens case _PC_XATTR_EXISTS: 3451*fa9e4066Sahrens zp = VTOZ(vp); 3452*fa9e4066Sahrens zfsvfs = zp->z_zfsvfs; 3453*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 3454*fa9e4066Sahrens *valp = 0; 3455*fa9e4066Sahrens error = zfs_dirent_lock(&dl, zp, "", &xzp, 3456*fa9e4066Sahrens ZXATTR | ZEXISTS | ZSHARED); 3457*fa9e4066Sahrens if (error == 0) { 3458*fa9e4066Sahrens zfs_dirent_unlock(dl); 3459*fa9e4066Sahrens if (!zfs_dirempty(xzp)) 3460*fa9e4066Sahrens *valp = 1; 3461*fa9e4066Sahrens VN_RELE(ZTOV(xzp)); 3462*fa9e4066Sahrens } else if (error == ENOENT) { 3463*fa9e4066Sahrens /* 3464*fa9e4066Sahrens * If there aren't extended attributes, it's the 3465*fa9e4066Sahrens * same as having zero of them. 3466*fa9e4066Sahrens */ 3467*fa9e4066Sahrens error = 0; 3468*fa9e4066Sahrens } 3469*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 3470*fa9e4066Sahrens return (error); 3471*fa9e4066Sahrens 3472*fa9e4066Sahrens case _PC_ACL_ENABLED: 3473*fa9e4066Sahrens *valp = _ACL_ACE_ENABLED; 3474*fa9e4066Sahrens return (0); 3475*fa9e4066Sahrens 3476*fa9e4066Sahrens case _PC_MIN_HOLE_SIZE: 3477*fa9e4066Sahrens *valp = (ulong_t)SPA_MINBLOCKSIZE; 3478*fa9e4066Sahrens return (0); 3479*fa9e4066Sahrens 3480*fa9e4066Sahrens default: 3481*fa9e4066Sahrens return (fs_pathconf(vp, cmd, valp, cr)); 3482*fa9e4066Sahrens } 3483*fa9e4066Sahrens } 3484*fa9e4066Sahrens 3485*fa9e4066Sahrens /*ARGSUSED*/ 3486*fa9e4066Sahrens static int 3487*fa9e4066Sahrens zfs_getsecattr(vnode_t *vp, vsecattr_t *vsecp, int flag, cred_t *cr) 3488*fa9e4066Sahrens { 3489*fa9e4066Sahrens znode_t *zp = VTOZ(vp); 3490*fa9e4066Sahrens zfsvfs_t *zfsvfs = zp->z_zfsvfs; 3491*fa9e4066Sahrens int error; 3492*fa9e4066Sahrens 3493*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 3494*fa9e4066Sahrens error = zfs_getacl(zp, vsecp, cr); 3495*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 3496*fa9e4066Sahrens 3497*fa9e4066Sahrens return (error); 3498*fa9e4066Sahrens } 3499*fa9e4066Sahrens 3500*fa9e4066Sahrens /*ARGSUSED*/ 3501*fa9e4066Sahrens static int 3502*fa9e4066Sahrens zfs_setsecattr(vnode_t *vp, vsecattr_t *vsecp, int flag, cred_t *cr) 3503*fa9e4066Sahrens { 3504*fa9e4066Sahrens znode_t *zp = VTOZ(vp); 3505*fa9e4066Sahrens zfsvfs_t *zfsvfs = zp->z_zfsvfs; 3506*fa9e4066Sahrens int error; 3507*fa9e4066Sahrens 3508*fa9e4066Sahrens ZFS_ENTER(zfsvfs); 3509*fa9e4066Sahrens error = zfs_setacl(zp, vsecp, cr); 3510*fa9e4066Sahrens ZFS_EXIT(zfsvfs); 3511*fa9e4066Sahrens return (error); 3512*fa9e4066Sahrens } 3513*fa9e4066Sahrens 3514*fa9e4066Sahrens /* 3515*fa9e4066Sahrens * Predeclare these here so that the compiler assumes that 3516*fa9e4066Sahrens * this is an "old style" function declaration that does 3517*fa9e4066Sahrens * not include arguments => we won't get type mismatch errors 3518*fa9e4066Sahrens * in the initializations that follow. 3519*fa9e4066Sahrens */ 3520*fa9e4066Sahrens static int zfs_inval(); 3521*fa9e4066Sahrens static int zfs_isdir(); 3522*fa9e4066Sahrens 3523*fa9e4066Sahrens static int 3524*fa9e4066Sahrens zfs_inval() 3525*fa9e4066Sahrens { 3526*fa9e4066Sahrens return (EINVAL); 3527*fa9e4066Sahrens } 3528*fa9e4066Sahrens 3529*fa9e4066Sahrens static int 3530*fa9e4066Sahrens zfs_isdir() 3531*fa9e4066Sahrens { 3532*fa9e4066Sahrens return (EISDIR); 3533*fa9e4066Sahrens } 3534*fa9e4066Sahrens /* 3535*fa9e4066Sahrens * Directory vnode operations template 3536*fa9e4066Sahrens */ 3537*fa9e4066Sahrens vnodeops_t *zfs_dvnodeops; 3538*fa9e4066Sahrens const fs_operation_def_t zfs_dvnodeops_template[] = { 3539*fa9e4066Sahrens VOPNAME_OPEN, zfs_open, 3540*fa9e4066Sahrens VOPNAME_CLOSE, zfs_close, 3541*fa9e4066Sahrens VOPNAME_READ, zfs_isdir, 3542*fa9e4066Sahrens VOPNAME_WRITE, zfs_isdir, 3543*fa9e4066Sahrens VOPNAME_IOCTL, zfs_ioctl, 3544*fa9e4066Sahrens VOPNAME_GETATTR, zfs_getattr, 3545*fa9e4066Sahrens VOPNAME_SETATTR, zfs_setattr, 3546*fa9e4066Sahrens VOPNAME_ACCESS, zfs_access, 3547*fa9e4066Sahrens VOPNAME_LOOKUP, zfs_lookup, 3548*fa9e4066Sahrens VOPNAME_CREATE, zfs_create, 3549*fa9e4066Sahrens VOPNAME_REMOVE, zfs_remove, 3550*fa9e4066Sahrens VOPNAME_LINK, zfs_link, 3551*fa9e4066Sahrens VOPNAME_RENAME, zfs_rename, 3552*fa9e4066Sahrens VOPNAME_MKDIR, zfs_mkdir, 3553*fa9e4066Sahrens VOPNAME_RMDIR, zfs_rmdir, 3554*fa9e4066Sahrens VOPNAME_READDIR, zfs_readdir, 3555*fa9e4066Sahrens VOPNAME_SYMLINK, zfs_symlink, 3556*fa9e4066Sahrens VOPNAME_FSYNC, zfs_fsync, 3557*fa9e4066Sahrens VOPNAME_INACTIVE, (fs_generic_func_p) zfs_inactive, 3558*fa9e4066Sahrens VOPNAME_FID, zfs_fid, 3559*fa9e4066Sahrens VOPNAME_SEEK, zfs_seek, 3560*fa9e4066Sahrens VOPNAME_PATHCONF, zfs_pathconf, 3561*fa9e4066Sahrens VOPNAME_GETSECATTR, zfs_getsecattr, 3562*fa9e4066Sahrens VOPNAME_SETSECATTR, zfs_setsecattr, 3563*fa9e4066Sahrens NULL, NULL 3564*fa9e4066Sahrens }; 3565*fa9e4066Sahrens 3566*fa9e4066Sahrens /* 3567*fa9e4066Sahrens * Regular file vnode operations template 3568*fa9e4066Sahrens */ 3569*fa9e4066Sahrens vnodeops_t *zfs_fvnodeops; 3570*fa9e4066Sahrens const fs_operation_def_t zfs_fvnodeops_template[] = { 3571*fa9e4066Sahrens VOPNAME_OPEN, zfs_open, 3572*fa9e4066Sahrens VOPNAME_CLOSE, zfs_close, 3573*fa9e4066Sahrens VOPNAME_READ, zfs_read, 3574*fa9e4066Sahrens VOPNAME_WRITE, zfs_write, 3575*fa9e4066Sahrens VOPNAME_IOCTL, zfs_ioctl, 3576*fa9e4066Sahrens VOPNAME_GETATTR, zfs_getattr, 3577*fa9e4066Sahrens VOPNAME_SETATTR, zfs_setattr, 3578*fa9e4066Sahrens VOPNAME_ACCESS, zfs_access, 3579*fa9e4066Sahrens VOPNAME_LOOKUP, zfs_lookup, 3580*fa9e4066Sahrens VOPNAME_RENAME, zfs_rename, 3581*fa9e4066Sahrens VOPNAME_FSYNC, zfs_fsync, 3582*fa9e4066Sahrens VOPNAME_INACTIVE, (fs_generic_func_p)zfs_inactive, 3583*fa9e4066Sahrens VOPNAME_FID, zfs_fid, 3584*fa9e4066Sahrens VOPNAME_SEEK, zfs_seek, 3585*fa9e4066Sahrens VOPNAME_FRLOCK, zfs_frlock, 3586*fa9e4066Sahrens VOPNAME_SPACE, zfs_space, 3587*fa9e4066Sahrens VOPNAME_GETPAGE, zfs_getpage, 3588*fa9e4066Sahrens VOPNAME_PUTPAGE, zfs_putpage, 3589*fa9e4066Sahrens VOPNAME_MAP, (fs_generic_func_p) zfs_map, 3590*fa9e4066Sahrens VOPNAME_ADDMAP, (fs_generic_func_p) zfs_addmap, 3591*fa9e4066Sahrens VOPNAME_DELMAP, zfs_delmap, 3592*fa9e4066Sahrens VOPNAME_PATHCONF, zfs_pathconf, 3593*fa9e4066Sahrens VOPNAME_GETSECATTR, zfs_getsecattr, 3594*fa9e4066Sahrens VOPNAME_SETSECATTR, zfs_setsecattr, 3595*fa9e4066Sahrens VOPNAME_VNEVENT, fs_vnevent_support, 3596*fa9e4066Sahrens NULL, NULL 3597*fa9e4066Sahrens }; 3598*fa9e4066Sahrens 3599*fa9e4066Sahrens /* 3600*fa9e4066Sahrens * Symbolic link vnode operations template 3601*fa9e4066Sahrens */ 3602*fa9e4066Sahrens vnodeops_t *zfs_symvnodeops; 3603*fa9e4066Sahrens const fs_operation_def_t zfs_symvnodeops_template[] = { 3604*fa9e4066Sahrens VOPNAME_GETATTR, zfs_getattr, 3605*fa9e4066Sahrens VOPNAME_SETATTR, zfs_setattr, 3606*fa9e4066Sahrens VOPNAME_ACCESS, zfs_access, 3607*fa9e4066Sahrens VOPNAME_RENAME, zfs_rename, 3608*fa9e4066Sahrens VOPNAME_READLINK, zfs_readlink, 3609*fa9e4066Sahrens VOPNAME_INACTIVE, (fs_generic_func_p) zfs_inactive, 3610*fa9e4066Sahrens VOPNAME_FID, zfs_fid, 3611*fa9e4066Sahrens VOPNAME_PATHCONF, zfs_pathconf, 3612*fa9e4066Sahrens VOPNAME_VNEVENT, fs_vnevent_support, 3613*fa9e4066Sahrens NULL, NULL 3614*fa9e4066Sahrens }; 3615*fa9e4066Sahrens 3616*fa9e4066Sahrens /* 3617*fa9e4066Sahrens * Extended attribute directory vnode operations template 3618*fa9e4066Sahrens * This template is identical to the directory vnodes 3619*fa9e4066Sahrens * operation template except for restricted operations: 3620*fa9e4066Sahrens * VOP_MKDIR() 3621*fa9e4066Sahrens * VOP_SYMLINK() 3622*fa9e4066Sahrens * Note that there are other restrictions embedded in: 3623*fa9e4066Sahrens * zfs_create() - restrict type to VREG 3624*fa9e4066Sahrens * zfs_link() - no links into/out of attribute space 3625*fa9e4066Sahrens * zfs_rename() - no moves into/out of attribute space 3626*fa9e4066Sahrens */ 3627*fa9e4066Sahrens vnodeops_t *zfs_xdvnodeops; 3628*fa9e4066Sahrens const fs_operation_def_t zfs_xdvnodeops_template[] = { 3629*fa9e4066Sahrens VOPNAME_OPEN, zfs_open, 3630*fa9e4066Sahrens VOPNAME_CLOSE, zfs_close, 3631*fa9e4066Sahrens VOPNAME_IOCTL, zfs_ioctl, 3632*fa9e4066Sahrens VOPNAME_GETATTR, zfs_getattr, 3633*fa9e4066Sahrens VOPNAME_SETATTR, zfs_setattr, 3634*fa9e4066Sahrens VOPNAME_ACCESS, zfs_access, 3635*fa9e4066Sahrens VOPNAME_LOOKUP, zfs_lookup, 3636*fa9e4066Sahrens VOPNAME_CREATE, zfs_create, 3637*fa9e4066Sahrens VOPNAME_REMOVE, zfs_remove, 3638*fa9e4066Sahrens VOPNAME_LINK, zfs_link, 3639*fa9e4066Sahrens VOPNAME_RENAME, zfs_rename, 3640*fa9e4066Sahrens VOPNAME_MKDIR, zfs_inval, 3641*fa9e4066Sahrens VOPNAME_RMDIR, zfs_rmdir, 3642*fa9e4066Sahrens VOPNAME_READDIR, zfs_readdir, 3643*fa9e4066Sahrens VOPNAME_SYMLINK, zfs_inval, 3644*fa9e4066Sahrens VOPNAME_FSYNC, zfs_fsync, 3645*fa9e4066Sahrens VOPNAME_INACTIVE, (fs_generic_func_p) zfs_inactive, 3646*fa9e4066Sahrens VOPNAME_FID, zfs_fid, 3647*fa9e4066Sahrens VOPNAME_SEEK, zfs_seek, 3648*fa9e4066Sahrens VOPNAME_PATHCONF, zfs_pathconf, 3649*fa9e4066Sahrens VOPNAME_GETSECATTR, zfs_getsecattr, 3650*fa9e4066Sahrens VOPNAME_SETSECATTR, zfs_setsecattr, 3651*fa9e4066Sahrens VOPNAME_VNEVENT, fs_vnevent_support, 3652*fa9e4066Sahrens NULL, NULL 3653*fa9e4066Sahrens }; 3654*fa9e4066Sahrens 3655*fa9e4066Sahrens /* 3656*fa9e4066Sahrens * Error vnode operations template 3657*fa9e4066Sahrens */ 3658*fa9e4066Sahrens vnodeops_t *zfs_evnodeops; 3659*fa9e4066Sahrens const fs_operation_def_t zfs_evnodeops_template[] = { 3660*fa9e4066Sahrens VOPNAME_INACTIVE, (fs_generic_func_p) zfs_inactive, 3661*fa9e4066Sahrens VOPNAME_PATHCONF, zfs_pathconf, 3662*fa9e4066Sahrens NULL, NULL 3663*fa9e4066Sahrens }; 3664