1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 50f2dc02eSek * Common Development and Distribution License (the "License"). 60f2dc02eSek * You may not use this file except in compliance with the License. 7fa9e4066Sahrens * 8fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 10fa9e4066Sahrens * See the License for the specific language governing permissions 11fa9e4066Sahrens * and limitations under the License. 12fa9e4066Sahrens * 13fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 16fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18fa9e4066Sahrens * 19fa9e4066Sahrens * CDDL HEADER END 20fa9e4066Sahrens */ 21fa9e4066Sahrens /* 2260030f27SMark Shellenbaum * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23fa9e4066Sahrens * Use is subject to license terms. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens /* 27fa9e4066Sahrens * ZFS control directory (a.k.a. ".zfs") 28fa9e4066Sahrens * 29fa9e4066Sahrens * This directory provides a common location for all ZFS meta-objects. 30fa9e4066Sahrens * Currently, this is only the 'snapshot' directory, but this may expand in the 31fa9e4066Sahrens * future. The elements are built using the GFS primitives, as the hierarchy 32fa9e4066Sahrens * does not actually exist on disk. 33fa9e4066Sahrens * 34fa9e4066Sahrens * For 'snapshot', we don't want to have all snapshots always mounted, because 35fa9e4066Sahrens * this would take up a huge amount of space in /etc/mnttab. We have three 36fa9e4066Sahrens * types of objects: 37fa9e4066Sahrens * 38fa9e4066Sahrens * ctldir ------> snapshotdir -------> snapshot 39fa9e4066Sahrens * | 40fa9e4066Sahrens * | 41fa9e4066Sahrens * V 42fa9e4066Sahrens * mounted fs 43fa9e4066Sahrens * 44fa9e4066Sahrens * The 'snapshot' node contains just enough information to lookup '..' and act 45fa9e4066Sahrens * as a mountpoint for the snapshot. Whenever we lookup a specific snapshot, we 46fa9e4066Sahrens * perform an automount of the underlying filesystem and return the 47fa9e4066Sahrens * corresponding vnode. 48fa9e4066Sahrens * 49fa9e4066Sahrens * All mounts are handled automatically by the kernel, but unmounts are 50fa9e4066Sahrens * (currently) handled from user land. The main reason is that there is no 51fa9e4066Sahrens * reliable way to auto-unmount the filesystem when it's "no longer in use". 52fa9e4066Sahrens * When the user unmounts a filesystem, we call zfsctl_unmount(), which 53fa9e4066Sahrens * unmounts any snapshots within the snapshot directory. 54f18faf3fSek * 55f18faf3fSek * The '.zfs', '.zfs/snapshot', and all directories created under 56f18faf3fSek * '.zfs/snapshot' (ie: '.zfs/snapshot/<snapname>') are all GFS nodes and 57f18faf3fSek * share the same vfs_t as the head filesystem (what '.zfs' lives under). 58f18faf3fSek * 59f18faf3fSek * File systems mounted ontop of the GFS nodes '.zfs/snapshot/<snapname>' 60f18faf3fSek * (ie: snapshots) are ZFS nodes and have their own unique vfs_t. 61f18faf3fSek * However, vnodes within these mounted on file systems have their v_vfsp 62f18faf3fSek * fields set to the head filesystem to make NFS happy (see 638bf40bf0Sck * zfsctl_snapdir_lookup()). We VFS_HOLD the head filesystem's vfs_t 648bf40bf0Sck * so that it cannot be freed until all snapshots have been unmounted. 65fa9e4066Sahrens */ 66fa9e4066Sahrens 67fa9e4066Sahrens #include <fs/fs_subr.h> 68fa9e4066Sahrens #include <sys/zfs_ctldir.h> 69fa9e4066Sahrens #include <sys/zfs_ioctl.h> 70fa9e4066Sahrens #include <sys/zfs_vfsops.h> 71aa59c4cbSrsb #include <sys/vfs_opreg.h> 72fa9e4066Sahrens #include <sys/gfs.h> 73fa9e4066Sahrens #include <sys/stat.h> 74fa9e4066Sahrens #include <sys/dmu.h> 75ecd6cf80Smarks #include <sys/dsl_deleg.h> 76fa9e4066Sahrens #include <sys/mount.h> 77ab04eb8eStimh #include <sys/sunddi.h> 78fa9e4066Sahrens 796d1e0b89Smarks #include "zfs_namecheck.h" 806d1e0b89Smarks 818bf40bf0Sck typedef struct zfsctl_node { 828bf40bf0Sck gfs_dir_t zc_gfs_private; 838bf40bf0Sck uint64_t zc_id; 848bf40bf0Sck timestruc_t zc_cmtime; /* ctime and mtime, always the same */ 858bf40bf0Sck } zfsctl_node_t; 868bf40bf0Sck 878bf40bf0Sck typedef struct zfsctl_snapdir { 888bf40bf0Sck zfsctl_node_t sd_node; 898bf40bf0Sck kmutex_t sd_lock; 908bf40bf0Sck avl_tree_t sd_snaps; 918bf40bf0Sck } zfsctl_snapdir_t; 928bf40bf0Sck 93fa9e4066Sahrens typedef struct { 94fa9e4066Sahrens char *se_name; 95fa9e4066Sahrens vnode_t *se_root; 96fa9e4066Sahrens avl_node_t se_node; 97fa9e4066Sahrens } zfs_snapentry_t; 98fa9e4066Sahrens 99fa9e4066Sahrens static int 100fa9e4066Sahrens snapentry_compare(const void *a, const void *b) 101fa9e4066Sahrens { 102fa9e4066Sahrens const zfs_snapentry_t *sa = a; 103fa9e4066Sahrens const zfs_snapentry_t *sb = b; 104fa9e4066Sahrens int ret = strcmp(sa->se_name, sb->se_name); 105fa9e4066Sahrens 106fa9e4066Sahrens if (ret < 0) 107fa9e4066Sahrens return (-1); 108fa9e4066Sahrens else if (ret > 0) 109fa9e4066Sahrens return (1); 110fa9e4066Sahrens else 111fa9e4066Sahrens return (0); 112fa9e4066Sahrens } 113fa9e4066Sahrens 114fa9e4066Sahrens vnodeops_t *zfsctl_ops_root; 115fa9e4066Sahrens vnodeops_t *zfsctl_ops_snapdir; 116fa9e4066Sahrens vnodeops_t *zfsctl_ops_snapshot; 117743a77edSAlan Wright vnodeops_t *zfsctl_ops_shares; 118743a77edSAlan Wright vnodeops_t *zfsctl_ops_shares_dir; 119fa9e4066Sahrens 120fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_root[]; 121fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapdir[]; 122fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapshot[]; 123743a77edSAlan Wright static const fs_operation_def_t zfsctl_tops_shares[]; 124fa9e4066Sahrens 125fa9e4066Sahrens static vnode_t *zfsctl_mknode_snapdir(vnode_t *); 126743a77edSAlan Wright static vnode_t *zfsctl_mknode_shares(vnode_t *); 127fa9e4066Sahrens static vnode_t *zfsctl_snapshot_mknode(vnode_t *, uint64_t objset); 1288bf40bf0Sck static int zfsctl_unmount_snap(zfs_snapentry_t *, int, cred_t *); 129fa9e4066Sahrens 130fa9e4066Sahrens static gfs_opsvec_t zfsctl_opsvec[] = { 131fa9e4066Sahrens { ".zfs", zfsctl_tops_root, &zfsctl_ops_root }, 132fa9e4066Sahrens { ".zfs/snapshot", zfsctl_tops_snapdir, &zfsctl_ops_snapdir }, 133fa9e4066Sahrens { ".zfs/snapshot/vnode", zfsctl_tops_snapshot, &zfsctl_ops_snapshot }, 134743a77edSAlan Wright { ".zfs/shares", zfsctl_tops_shares, &zfsctl_ops_shares_dir }, 135743a77edSAlan Wright { ".zfs/shares/vnode", zfsctl_tops_shares, &zfsctl_ops_shares }, 136fa9e4066Sahrens { NULL } 137fa9e4066Sahrens }; 138fa9e4066Sahrens 139fa9e4066Sahrens /* 140743a77edSAlan Wright * Root directory elements. We only have two entries 141743a77edSAlan Wright * snapshot and shares. 142fa9e4066Sahrens */ 143fa9e4066Sahrens static gfs_dirent_t zfsctl_root_entries[] = { 144fa9e4066Sahrens { "snapshot", zfsctl_mknode_snapdir, GFS_CACHE_VNODE }, 145743a77edSAlan Wright { "shares", zfsctl_mknode_shares, GFS_CACHE_VNODE }, 146fa9e4066Sahrens { NULL } 147fa9e4066Sahrens }; 148fa9e4066Sahrens 149fa9e4066Sahrens /* include . and .. in the calculation */ 150fa9e4066Sahrens #define NROOT_ENTRIES ((sizeof (zfsctl_root_entries) / \ 151fa9e4066Sahrens sizeof (gfs_dirent_t)) + 1) 152fa9e4066Sahrens 153fa9e4066Sahrens 154fa9e4066Sahrens /* 155fa9e4066Sahrens * Initialize the various GFS pieces we'll need to create and manipulate .zfs 156fa9e4066Sahrens * directories. This is called from the ZFS init routine, and initializes the 157fa9e4066Sahrens * vnode ops vectors that we'll be using. 158fa9e4066Sahrens */ 159fa9e4066Sahrens void 160fa9e4066Sahrens zfsctl_init(void) 161fa9e4066Sahrens { 162fa9e4066Sahrens VERIFY(gfs_make_opsvec(zfsctl_opsvec) == 0); 163fa9e4066Sahrens } 164fa9e4066Sahrens 165fa9e4066Sahrens void 166fa9e4066Sahrens zfsctl_fini(void) 167fa9e4066Sahrens { 168fa9e4066Sahrens /* 169fa9e4066Sahrens * Remove vfsctl vnode ops 170fa9e4066Sahrens */ 171fa9e4066Sahrens if (zfsctl_ops_root) 172fa9e4066Sahrens vn_freevnodeops(zfsctl_ops_root); 173fa9e4066Sahrens if (zfsctl_ops_snapdir) 174fa9e4066Sahrens vn_freevnodeops(zfsctl_ops_snapdir); 175fa9e4066Sahrens if (zfsctl_ops_snapshot) 176fa9e4066Sahrens vn_freevnodeops(zfsctl_ops_snapshot); 177743a77edSAlan Wright if (zfsctl_ops_shares) 178743a77edSAlan Wright vn_freevnodeops(zfsctl_ops_shares); 179743a77edSAlan Wright if (zfsctl_ops_shares_dir) 180743a77edSAlan Wright vn_freevnodeops(zfsctl_ops_shares_dir); 181fa9e4066Sahrens 182fa9e4066Sahrens zfsctl_ops_root = NULL; 183fa9e4066Sahrens zfsctl_ops_snapdir = NULL; 184fa9e4066Sahrens zfsctl_ops_snapshot = NULL; 185743a77edSAlan Wright zfsctl_ops_shares = NULL; 186743a77edSAlan Wright zfsctl_ops_shares_dir = NULL; 187fa9e4066Sahrens } 188fa9e4066Sahrens 189fa9e4066Sahrens /* 190743a77edSAlan Wright * Return the inode number associated with the 'snapshot' or 191743a77edSAlan Wright * 'shares' directory. 192fa9e4066Sahrens */ 193fa9e4066Sahrens /* ARGSUSED */ 194fa9e4066Sahrens static ino64_t 195fa9e4066Sahrens zfsctl_root_inode_cb(vnode_t *vp, int index) 196fa9e4066Sahrens { 197743a77edSAlan Wright zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 198743a77edSAlan Wright 199743a77edSAlan Wright ASSERT(index <= 2); 200743a77edSAlan Wright 201743a77edSAlan Wright if (index == 0) 202743a77edSAlan Wright return (ZFSCTL_INO_SNAPDIR); 203743a77edSAlan Wright 204743a77edSAlan Wright return (zfsvfs->z_shares_dir); 205fa9e4066Sahrens } 206fa9e4066Sahrens 207fa9e4066Sahrens /* 208fa9e4066Sahrens * Create the '.zfs' directory. This directory is cached as part of the VFS 209fa9e4066Sahrens * structure. This results in a hold on the vfs_t. The code in zfs_umount() 210fa9e4066Sahrens * therefore checks against a vfs_count of 2 instead of 1. This reference 211fa9e4066Sahrens * is removed when the ctldir is destroyed in the unmount. 212fa9e4066Sahrens */ 213fa9e4066Sahrens void 214fa9e4066Sahrens zfsctl_create(zfsvfs_t *zfsvfs) 215fa9e4066Sahrens { 216a32fded1Sek vnode_t *vp, *rvp; 217fa9e4066Sahrens zfsctl_node_t *zcp; 218fa9e4066Sahrens 219fa9e4066Sahrens ASSERT(zfsvfs->z_ctldir == NULL); 220fa9e4066Sahrens 221fa9e4066Sahrens vp = gfs_root_create(sizeof (zfsctl_node_t), zfsvfs->z_vfs, 222fa9e4066Sahrens zfsctl_ops_root, ZFSCTL_INO_ROOT, zfsctl_root_entries, 223fa9e4066Sahrens zfsctl_root_inode_cb, MAXNAMELEN, NULL, NULL); 224fa9e4066Sahrens zcp = vp->v_data; 225fa9e4066Sahrens zcp->zc_id = ZFSCTL_INO_ROOT; 226fa9e4066Sahrens 227a32fded1Sek VERIFY(VFS_ROOT(zfsvfs->z_vfs, &rvp) == 0); 228a32fded1Sek ZFS_TIME_DECODE(&zcp->zc_cmtime, VTOZ(rvp)->z_phys->zp_crtime); 229a32fded1Sek VN_RELE(rvp); 230a32fded1Sek 231fa9e4066Sahrens /* 232fa9e4066Sahrens * We're only faking the fact that we have a root of a filesystem for 233fa9e4066Sahrens * the sake of the GFS interfaces. Undo the flag manipulation it did 234fa9e4066Sahrens * for us. 235fa9e4066Sahrens */ 236fa9e4066Sahrens vp->v_flag &= ~(VROOT | VNOCACHE | VNOMAP | VNOSWAP | VNOMOUNT); 237fa9e4066Sahrens 238fa9e4066Sahrens zfsvfs->z_ctldir = vp; 239fa9e4066Sahrens } 240fa9e4066Sahrens 241fa9e4066Sahrens /* 2428afd4dd6Sperrin * Destroy the '.zfs' directory. Only called when the filesystem is unmounted. 2438afd4dd6Sperrin * There might still be more references if we were force unmounted, but only 2448afd4dd6Sperrin * new zfs_inactive() calls can occur and they don't reference .zfs 245fa9e4066Sahrens */ 246fa9e4066Sahrens void 247fa9e4066Sahrens zfsctl_destroy(zfsvfs_t *zfsvfs) 248fa9e4066Sahrens { 249fa9e4066Sahrens VN_RELE(zfsvfs->z_ctldir); 250fa9e4066Sahrens zfsvfs->z_ctldir = NULL; 251fa9e4066Sahrens } 252fa9e4066Sahrens 253fa9e4066Sahrens /* 254fa9e4066Sahrens * Given a root znode, retrieve the associated .zfs directory. 255fa9e4066Sahrens * Add a hold to the vnode and return it. 256fa9e4066Sahrens */ 257fa9e4066Sahrens vnode_t * 258fa9e4066Sahrens zfsctl_root(znode_t *zp) 259fa9e4066Sahrens { 260fa9e4066Sahrens ASSERT(zfs_has_ctldir(zp)); 261fa9e4066Sahrens VN_HOLD(zp->z_zfsvfs->z_ctldir); 262fa9e4066Sahrens return (zp->z_zfsvfs->z_ctldir); 263fa9e4066Sahrens } 264fa9e4066Sahrens 265fa9e4066Sahrens /* 266fa9e4066Sahrens * Common open routine. Disallow any write access. 267fa9e4066Sahrens */ 268fa9e4066Sahrens /* ARGSUSED */ 269fa9e4066Sahrens static int 270da6c28aaSamw zfsctl_common_open(vnode_t **vpp, int flags, cred_t *cr, caller_context_t *ct) 271fa9e4066Sahrens { 272fa9e4066Sahrens if (flags & FWRITE) 273fa9e4066Sahrens return (EACCES); 274fa9e4066Sahrens 275fa9e4066Sahrens return (0); 276fa9e4066Sahrens } 277fa9e4066Sahrens 278fa9e4066Sahrens /* 279fa9e4066Sahrens * Common close routine. Nothing to do here. 280fa9e4066Sahrens */ 281fa9e4066Sahrens /* ARGSUSED */ 282fa9e4066Sahrens static int 283fa9e4066Sahrens zfsctl_common_close(vnode_t *vpp, int flags, int count, offset_t off, 284da6c28aaSamw cred_t *cr, caller_context_t *ct) 285fa9e4066Sahrens { 286fa9e4066Sahrens return (0); 287fa9e4066Sahrens } 288fa9e4066Sahrens 289fa9e4066Sahrens /* 290fa9e4066Sahrens * Common access routine. Disallow writes. 291fa9e4066Sahrens */ 292fa9e4066Sahrens /* ARGSUSED */ 293fa9e4066Sahrens static int 294da6c28aaSamw zfsctl_common_access(vnode_t *vp, int mode, int flags, cred_t *cr, 295da6c28aaSamw caller_context_t *ct) 296fa9e4066Sahrens { 29760030f27SMark Shellenbaum if (flags & V_ACE_MASK) { 29860030f27SMark Shellenbaum if (mode & ACE_ALL_WRITE_PERMS) 29960030f27SMark Shellenbaum return (EACCES); 30060030f27SMark Shellenbaum } else { 30160030f27SMark Shellenbaum if (mode & VWRITE) 30260030f27SMark Shellenbaum return (EACCES); 30360030f27SMark Shellenbaum } 304fa9e4066Sahrens 305fa9e4066Sahrens return (0); 306fa9e4066Sahrens } 307fa9e4066Sahrens 308fa9e4066Sahrens /* 309fa9e4066Sahrens * Common getattr function. Fill in basic information. 310fa9e4066Sahrens */ 311fa9e4066Sahrens static void 312fa9e4066Sahrens zfsctl_common_getattr(vnode_t *vp, vattr_t *vap) 313fa9e4066Sahrens { 314a32fded1Sek zfsctl_node_t *zcp = vp->v_data; 315a32fded1Sek timestruc_t now; 316fa9e4066Sahrens 317fa9e4066Sahrens vap->va_uid = 0; 318fa9e4066Sahrens vap->va_gid = 0; 319fa9e4066Sahrens vap->va_rdev = 0; 320fa9e4066Sahrens /* 321fa9e4066Sahrens * We are a purly virtual object, so we have no 322fa9e4066Sahrens * blocksize or allocated blocks. 323fa9e4066Sahrens */ 324fa9e4066Sahrens vap->va_blksize = 0; 325fa9e4066Sahrens vap->va_nblocks = 0; 326fa9e4066Sahrens vap->va_seq = 0; 327fa9e4066Sahrens vap->va_fsid = vp->v_vfsp->vfs_dev; 328fa9e4066Sahrens vap->va_mode = S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP | 329fa9e4066Sahrens S_IROTH | S_IXOTH; 330fa9e4066Sahrens vap->va_type = VDIR; 331fa9e4066Sahrens /* 332a32fded1Sek * We live in the now (for atime). 333fa9e4066Sahrens */ 334fa9e4066Sahrens gethrestime(&now); 335a32fded1Sek vap->va_atime = now; 336a32fded1Sek vap->va_mtime = vap->va_ctime = zcp->zc_cmtime; 337fa9e4066Sahrens } 338fa9e4066Sahrens 339da6c28aaSamw /*ARGSUSED*/ 340fa9e4066Sahrens static int 341da6c28aaSamw zfsctl_common_fid(vnode_t *vp, fid_t *fidp, caller_context_t *ct) 342fa9e4066Sahrens { 343fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 344fa9e4066Sahrens zfsctl_node_t *zcp = vp->v_data; 345fa9e4066Sahrens uint64_t object = zcp->zc_id; 346fa9e4066Sahrens zfid_short_t *zfid; 347fa9e4066Sahrens int i; 348fa9e4066Sahrens 349fa9e4066Sahrens ZFS_ENTER(zfsvfs); 350fa9e4066Sahrens 351fa9e4066Sahrens if (fidp->fid_len < SHORT_FID_LEN) { 352fa9e4066Sahrens fidp->fid_len = SHORT_FID_LEN; 3530f2dc02eSek ZFS_EXIT(zfsvfs); 354fa9e4066Sahrens return (ENOSPC); 355fa9e4066Sahrens } 356fa9e4066Sahrens 357fa9e4066Sahrens zfid = (zfid_short_t *)fidp; 358fa9e4066Sahrens 359fa9e4066Sahrens zfid->zf_len = SHORT_FID_LEN; 360fa9e4066Sahrens 361fa9e4066Sahrens for (i = 0; i < sizeof (zfid->zf_object); i++) 362fa9e4066Sahrens zfid->zf_object[i] = (uint8_t)(object >> (8 * i)); 363fa9e4066Sahrens 364fa9e4066Sahrens /* .zfs znodes always have a generation number of 0 */ 365fa9e4066Sahrens for (i = 0; i < sizeof (zfid->zf_gen); i++) 366fa9e4066Sahrens zfid->zf_gen[i] = 0; 367fa9e4066Sahrens 368fa9e4066Sahrens ZFS_EXIT(zfsvfs); 369fa9e4066Sahrens return (0); 370fa9e4066Sahrens } 371fa9e4066Sahrens 372743a77edSAlan Wright 373743a77edSAlan Wright /*ARGSUSED*/ 374743a77edSAlan Wright static int 375743a77edSAlan Wright zfsctl_shares_fid(vnode_t *vp, fid_t *fidp, caller_context_t *ct) 376743a77edSAlan Wright { 377743a77edSAlan Wright zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 378743a77edSAlan Wright znode_t *dzp; 379743a77edSAlan Wright int error; 380743a77edSAlan Wright 381743a77edSAlan Wright ZFS_ENTER(zfsvfs); 382*9e1320c0SMark Shellenbaum 383*9e1320c0SMark Shellenbaum if (zfsvfs->z_shares_dir == 0) { 384*9e1320c0SMark Shellenbaum ZFS_EXIT(zfsvfs); 385*9e1320c0SMark Shellenbaum return (ENOTSUP); 386*9e1320c0SMark Shellenbaum } 387*9e1320c0SMark Shellenbaum 388743a77edSAlan Wright if ((error = zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp)) == 0) { 389743a77edSAlan Wright error = VOP_FID(ZTOV(dzp), fidp, ct); 390743a77edSAlan Wright VN_RELE(ZTOV(dzp)); 391743a77edSAlan Wright } 392743a77edSAlan Wright 393743a77edSAlan Wright ZFS_EXIT(zfsvfs); 394743a77edSAlan Wright return (error); 395743a77edSAlan Wright } 396fa9e4066Sahrens /* 397fa9e4066Sahrens * .zfs inode namespace 398fa9e4066Sahrens * 399fa9e4066Sahrens * We need to generate unique inode numbers for all files and directories 400fa9e4066Sahrens * within the .zfs pseudo-filesystem. We use the following scheme: 401fa9e4066Sahrens * 402fa9e4066Sahrens * ENTRY ZFSCTL_INODE 403fa9e4066Sahrens * .zfs 1 404fa9e4066Sahrens * .zfs/snapshot 2 405fa9e4066Sahrens * .zfs/snapshot/<snap> objectid(snap) 406fa9e4066Sahrens */ 407fa9e4066Sahrens 408fa9e4066Sahrens #define ZFSCTL_INO_SNAP(id) (id) 409fa9e4066Sahrens 410fa9e4066Sahrens /* 411fa9e4066Sahrens * Get root directory attributes. 412fa9e4066Sahrens */ 413fa9e4066Sahrens /* ARGSUSED */ 414fa9e4066Sahrens static int 415da6c28aaSamw zfsctl_root_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr, 416da6c28aaSamw caller_context_t *ct) 417fa9e4066Sahrens { 418fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 419fa9e4066Sahrens 420fa9e4066Sahrens ZFS_ENTER(zfsvfs); 421fa9e4066Sahrens vap->va_nodeid = ZFSCTL_INO_ROOT; 422fa9e4066Sahrens vap->va_nlink = vap->va_size = NROOT_ENTRIES; 423fa9e4066Sahrens 424fa9e4066Sahrens zfsctl_common_getattr(vp, vap); 425fa9e4066Sahrens ZFS_EXIT(zfsvfs); 426fa9e4066Sahrens 427fa9e4066Sahrens return (0); 428fa9e4066Sahrens } 429fa9e4066Sahrens 430fa9e4066Sahrens /* 431fa9e4066Sahrens * Special case the handling of "..". 432fa9e4066Sahrens */ 433fa9e4066Sahrens /* ARGSUSED */ 434fa9e4066Sahrens int 435fa9e4066Sahrens zfsctl_root_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, pathname_t *pnp, 436da6c28aaSamw int flags, vnode_t *rdir, cred_t *cr, caller_context_t *ct, 437da6c28aaSamw int *direntflags, pathname_t *realpnp) 438fa9e4066Sahrens { 439fa9e4066Sahrens zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data; 440fa9e4066Sahrens int err; 441fa9e4066Sahrens 442da6c28aaSamw /* 443da6c28aaSamw * No extended attributes allowed under .zfs 444da6c28aaSamw */ 445da6c28aaSamw if (flags & LOOKUP_XATTR) 446da6c28aaSamw return (EINVAL); 447da6c28aaSamw 448fa9e4066Sahrens ZFS_ENTER(zfsvfs); 449fa9e4066Sahrens 450fa9e4066Sahrens if (strcmp(nm, "..") == 0) { 451fa9e4066Sahrens err = VFS_ROOT(dvp->v_vfsp, vpp); 452fa9e4066Sahrens } else { 453ab04eb8eStimh err = gfs_vop_lookup(dvp, nm, vpp, pnp, flags, rdir, 454ab04eb8eStimh cr, ct, direntflags, realpnp); 455fa9e4066Sahrens } 456fa9e4066Sahrens 457fa9e4066Sahrens ZFS_EXIT(zfsvfs); 458fa9e4066Sahrens 459fa9e4066Sahrens return (err); 460fa9e4066Sahrens } 461fa9e4066Sahrens 46260030f27SMark Shellenbaum static int 46360030f27SMark Shellenbaum zfsctl_pathconf(vnode_t *vp, int cmd, ulong_t *valp, cred_t *cr, 46460030f27SMark Shellenbaum caller_context_t *ct) 46560030f27SMark Shellenbaum { 46660030f27SMark Shellenbaum /* 46760030f27SMark Shellenbaum * We only care about ACL_ENABLED so that libsec can 46860030f27SMark Shellenbaum * display ACL correctly and not default to POSIX draft. 46960030f27SMark Shellenbaum */ 47060030f27SMark Shellenbaum if (cmd == _PC_ACL_ENABLED) { 47160030f27SMark Shellenbaum *valp = _ACL_ACE_ENABLED; 47260030f27SMark Shellenbaum return (0); 47360030f27SMark Shellenbaum } 47460030f27SMark Shellenbaum 47560030f27SMark Shellenbaum return (fs_pathconf(vp, cmd, valp, cr, ct)); 47660030f27SMark Shellenbaum } 47760030f27SMark Shellenbaum 478fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_root[] = { 479aa59c4cbSrsb { VOPNAME_OPEN, { .vop_open = zfsctl_common_open } }, 480aa59c4cbSrsb { VOPNAME_CLOSE, { .vop_close = zfsctl_common_close } }, 481aa59c4cbSrsb { VOPNAME_IOCTL, { .error = fs_inval } }, 482aa59c4cbSrsb { VOPNAME_GETATTR, { .vop_getattr = zfsctl_root_getattr } }, 483aa59c4cbSrsb { VOPNAME_ACCESS, { .vop_access = zfsctl_common_access } }, 484aa59c4cbSrsb { VOPNAME_READDIR, { .vop_readdir = gfs_vop_readdir } }, 485aa59c4cbSrsb { VOPNAME_LOOKUP, { .vop_lookup = zfsctl_root_lookup } }, 486aa59c4cbSrsb { VOPNAME_SEEK, { .vop_seek = fs_seek } }, 487aa59c4cbSrsb { VOPNAME_INACTIVE, { .vop_inactive = gfs_vop_inactive } }, 48860030f27SMark Shellenbaum { VOPNAME_PATHCONF, { .vop_pathconf = zfsctl_pathconf } }, 489aa59c4cbSrsb { VOPNAME_FID, { .vop_fid = zfsctl_common_fid } }, 490fa9e4066Sahrens { NULL } 491fa9e4066Sahrens }; 492fa9e4066Sahrens 493fa9e4066Sahrens static int 494fa9e4066Sahrens zfsctl_snapshot_zname(vnode_t *vp, const char *name, int len, char *zname) 495fa9e4066Sahrens { 496fa9e4066Sahrens objset_t *os = ((zfsvfs_t *)((vp)->v_vfsp->vfs_data))->z_os; 497fa9e4066Sahrens 4986d1e0b89Smarks if (snapshot_namecheck(name, NULL, NULL) != 0) 4996d1e0b89Smarks return (EILSEQ); 500fa9e4066Sahrens dmu_objset_name(os, zname); 5015422900bSmaybee if (strlen(zname) + 1 + strlen(name) >= len) 502fa9e4066Sahrens return (ENAMETOOLONG); 5035422900bSmaybee (void) strcat(zname, "@"); 504fa9e4066Sahrens (void) strcat(zname, name); 505fa9e4066Sahrens return (0); 506fa9e4066Sahrens } 507fa9e4066Sahrens 5088bf40bf0Sck static int 5098bf40bf0Sck zfsctl_unmount_snap(zfs_snapentry_t *sep, int fflags, cred_t *cr) 510fa9e4066Sahrens { 5118bf40bf0Sck vnode_t *svp = sep->se_root; 5128bf40bf0Sck int error; 513fa9e4066Sahrens 5148bf40bf0Sck ASSERT(vn_ismntpt(svp)); 515fa9e4066Sahrens 516fa9e4066Sahrens /* this will be dropped by dounmount() */ 5178bf40bf0Sck if ((error = vn_vfswlock(svp)) != 0) 5188bf40bf0Sck return (error); 519fa9e4066Sahrens 5208bf40bf0Sck VN_HOLD(svp); 5218bf40bf0Sck error = dounmount(vn_mountedvfs(svp), fflags, cr); 5228bf40bf0Sck if (error) { 5238bf40bf0Sck VN_RELE(svp); 5248bf40bf0Sck return (error); 525bbf4a8dfSmaybee } 5268bf40bf0Sck VFS_RELE(svp->v_vfsp); 5278bf40bf0Sck /* 5288bf40bf0Sck * We can't use VN_RELE(), as that will try to invoke 5298bf40bf0Sck * zfsctl_snapdir_inactive(), which would cause us to destroy 5308bf40bf0Sck * the sd_lock mutex held by our caller. 5318bf40bf0Sck */ 5328bf40bf0Sck ASSERT(svp->v_count == 1); 5338bf40bf0Sck gfs_vop_inactive(svp, cr, NULL); 534fa9e4066Sahrens 535fa9e4066Sahrens kmem_free(sep->se_name, strlen(sep->se_name) + 1); 536fa9e4066Sahrens kmem_free(sep, sizeof (zfs_snapentry_t)); 537fa9e4066Sahrens 538fa9e4066Sahrens return (0); 539fa9e4066Sahrens } 540fa9e4066Sahrens 5415422900bSmaybee static void 542fa9e4066Sahrens zfsctl_rename_snap(zfsctl_snapdir_t *sdp, zfs_snapentry_t *sep, const char *nm) 543fa9e4066Sahrens { 544fa9e4066Sahrens avl_index_t where; 545fa9e4066Sahrens vfs_t *vfsp; 546fa9e4066Sahrens refstr_t *pathref; 547fa9e4066Sahrens char newpath[MAXNAMELEN]; 548fa9e4066Sahrens char *tail; 549fa9e4066Sahrens 550fa9e4066Sahrens ASSERT(MUTEX_HELD(&sdp->sd_lock)); 551fa9e4066Sahrens ASSERT(sep != NULL); 552fa9e4066Sahrens 553fa9e4066Sahrens vfsp = vn_mountedvfs(sep->se_root); 554fa9e4066Sahrens ASSERT(vfsp != NULL); 555fa9e4066Sahrens 5565422900bSmaybee vfs_lock_wait(vfsp); 557fa9e4066Sahrens 558fa9e4066Sahrens /* 559fa9e4066Sahrens * Change the name in the AVL tree. 560fa9e4066Sahrens */ 561fa9e4066Sahrens avl_remove(&sdp->sd_snaps, sep); 562fa9e4066Sahrens kmem_free(sep->se_name, strlen(sep->se_name) + 1); 563fa9e4066Sahrens sep->se_name = kmem_alloc(strlen(nm) + 1, KM_SLEEP); 564fa9e4066Sahrens (void) strcpy(sep->se_name, nm); 565fa9e4066Sahrens VERIFY(avl_find(&sdp->sd_snaps, sep, &where) == NULL); 566fa9e4066Sahrens avl_insert(&sdp->sd_snaps, sep, where); 567fa9e4066Sahrens 568fa9e4066Sahrens /* 569fa9e4066Sahrens * Change the current mountpoint info: 570fa9e4066Sahrens * - update the tail of the mntpoint path 571fa9e4066Sahrens * - update the tail of the resource path 572fa9e4066Sahrens */ 573fa9e4066Sahrens pathref = vfs_getmntpoint(vfsp); 5740b69c2f0Sahrens (void) strncpy(newpath, refstr_value(pathref), sizeof (newpath)); 5750b69c2f0Sahrens VERIFY((tail = strrchr(newpath, '/')) != NULL); 5760b69c2f0Sahrens *(tail+1) = '\0'; 5770b69c2f0Sahrens ASSERT3U(strlen(newpath) + strlen(nm), <, sizeof (newpath)); 578fa9e4066Sahrens (void) strcat(newpath, nm); 579fa9e4066Sahrens refstr_rele(pathref); 580fa9e4066Sahrens vfs_setmntpoint(vfsp, newpath); 581fa9e4066Sahrens 582fa9e4066Sahrens pathref = vfs_getresource(vfsp); 5830b69c2f0Sahrens (void) strncpy(newpath, refstr_value(pathref), sizeof (newpath)); 5840b69c2f0Sahrens VERIFY((tail = strrchr(newpath, '@')) != NULL); 5850b69c2f0Sahrens *(tail+1) = '\0'; 5860b69c2f0Sahrens ASSERT3U(strlen(newpath) + strlen(nm), <, sizeof (newpath)); 587fa9e4066Sahrens (void) strcat(newpath, nm); 588fa9e4066Sahrens refstr_rele(pathref); 589fa9e4066Sahrens vfs_setresource(vfsp, newpath); 590fa9e4066Sahrens 591fa9e4066Sahrens vfs_unlock(vfsp); 592fa9e4066Sahrens } 593fa9e4066Sahrens 594da6c28aaSamw /*ARGSUSED*/ 595fa9e4066Sahrens static int 596fa9e4066Sahrens zfsctl_snapdir_rename(vnode_t *sdvp, char *snm, vnode_t *tdvp, char *tnm, 597da6c28aaSamw cred_t *cr, caller_context_t *ct, int flags) 598fa9e4066Sahrens { 599fa9e4066Sahrens zfsctl_snapdir_t *sdp = sdvp->v_data; 600fa9e4066Sahrens zfs_snapentry_t search, *sep; 601ab04eb8eStimh zfsvfs_t *zfsvfs; 602fa9e4066Sahrens avl_index_t where; 603fa9e4066Sahrens char from[MAXNAMELEN], to[MAXNAMELEN]; 604ab04eb8eStimh char real[MAXNAMELEN]; 605fa9e4066Sahrens int err; 606fa9e4066Sahrens 607ab04eb8eStimh zfsvfs = sdvp->v_vfsp->vfs_data; 608ab04eb8eStimh ZFS_ENTER(zfsvfs); 609ab04eb8eStimh 610ab04eb8eStimh if ((flags & FIGNORECASE) || zfsvfs->z_case == ZFS_CASE_INSENSITIVE) { 611ab04eb8eStimh err = dmu_snapshot_realname(zfsvfs->z_os, snm, real, 612ab04eb8eStimh MAXNAMELEN, NULL); 613ab04eb8eStimh if (err == 0) { 614ab04eb8eStimh snm = real; 615ab04eb8eStimh } else if (err != ENOTSUP) { 616ab04eb8eStimh ZFS_EXIT(zfsvfs); 617ab04eb8eStimh return (err); 618ab04eb8eStimh } 619ab04eb8eStimh } 620ab04eb8eStimh 621ab04eb8eStimh ZFS_EXIT(zfsvfs); 622ecd6cf80Smarks 623ab04eb8eStimh err = zfsctl_snapshot_zname(sdvp, snm, MAXNAMELEN, from); 624ab04eb8eStimh if (!err) 625ab04eb8eStimh err = zfsctl_snapshot_zname(tdvp, tnm, MAXNAMELEN, to); 626ab04eb8eStimh if (!err) 627ab04eb8eStimh err = zfs_secpolicy_rename_perms(from, to, cr); 628fa9e4066Sahrens if (err) 629fa9e4066Sahrens return (err); 630fa9e4066Sahrens 631fa9e4066Sahrens /* 632fa9e4066Sahrens * Cannot move snapshots out of the snapdir. 633fa9e4066Sahrens */ 634fa9e4066Sahrens if (sdvp != tdvp) 635fa9e4066Sahrens return (EINVAL); 636fa9e4066Sahrens 637fa9e4066Sahrens if (strcmp(snm, tnm) == 0) 638fa9e4066Sahrens return (0); 639fa9e4066Sahrens 640fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 641fa9e4066Sahrens 642fa9e4066Sahrens search.se_name = (char *)snm; 6435422900bSmaybee if ((sep = avl_find(&sdp->sd_snaps, &search, &where)) == NULL) { 6445422900bSmaybee mutex_exit(&sdp->sd_lock); 6455422900bSmaybee return (ENOENT); 646fa9e4066Sahrens } 647fa9e4066Sahrens 648cdf5b4caSmmusante err = dmu_objset_rename(from, to, B_FALSE); 6495422900bSmaybee if (err == 0) 6505422900bSmaybee zfsctl_rename_snap(sdp, sep, tnm); 651fa9e4066Sahrens 652fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 653fa9e4066Sahrens 654fa9e4066Sahrens return (err); 655fa9e4066Sahrens } 656fa9e4066Sahrens 657fa9e4066Sahrens /* ARGSUSED */ 658fa9e4066Sahrens static int 659da6c28aaSamw zfsctl_snapdir_remove(vnode_t *dvp, char *name, vnode_t *cwd, cred_t *cr, 660da6c28aaSamw caller_context_t *ct, int flags) 661fa9e4066Sahrens { 662fa9e4066Sahrens zfsctl_snapdir_t *sdp = dvp->v_data; 6638bf40bf0Sck zfs_snapentry_t *sep; 6648bf40bf0Sck zfs_snapentry_t search; 665ab04eb8eStimh zfsvfs_t *zfsvfs; 666fa9e4066Sahrens char snapname[MAXNAMELEN]; 667ab04eb8eStimh char real[MAXNAMELEN]; 668fa9e4066Sahrens int err; 669fa9e4066Sahrens 670ab04eb8eStimh zfsvfs = dvp->v_vfsp->vfs_data; 671ab04eb8eStimh ZFS_ENTER(zfsvfs); 672ab04eb8eStimh 673ab04eb8eStimh if ((flags & FIGNORECASE) || zfsvfs->z_case == ZFS_CASE_INSENSITIVE) { 674ab04eb8eStimh 675ab04eb8eStimh err = dmu_snapshot_realname(zfsvfs->z_os, name, real, 676ab04eb8eStimh MAXNAMELEN, NULL); 677ab04eb8eStimh if (err == 0) { 678ab04eb8eStimh name = real; 679ab04eb8eStimh } else if (err != ENOTSUP) { 680ab04eb8eStimh ZFS_EXIT(zfsvfs); 681ab04eb8eStimh return (err); 682ab04eb8eStimh } 683ab04eb8eStimh } 684ab04eb8eStimh 685ab04eb8eStimh ZFS_EXIT(zfsvfs); 686ab04eb8eStimh 6875422900bSmaybee err = zfsctl_snapshot_zname(dvp, name, MAXNAMELEN, snapname); 688ab04eb8eStimh if (!err) 689ab04eb8eStimh err = zfs_secpolicy_destroy_perms(snapname, cr); 6905422900bSmaybee if (err) 6915422900bSmaybee return (err); 692ecd6cf80Smarks 693fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 694fa9e4066Sahrens 6958bf40bf0Sck search.se_name = name; 6968bf40bf0Sck sep = avl_find(&sdp->sd_snaps, &search, NULL); 6978bf40bf0Sck if (sep) { 6988bf40bf0Sck avl_remove(&sdp->sd_snaps, sep); 6998bf40bf0Sck err = zfsctl_unmount_snap(sep, MS_FORCE, cr); 7008bf40bf0Sck if (err) 7018bf40bf0Sck avl_add(&sdp->sd_snaps, sep); 7028bf40bf0Sck else 7038bf40bf0Sck err = dmu_objset_destroy(snapname); 7048bf40bf0Sck } else { 7058bf40bf0Sck err = ENOENT; 706fa9e4066Sahrens } 707fa9e4066Sahrens 708fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 709fa9e4066Sahrens 710fa9e4066Sahrens return (err); 711fa9e4066Sahrens } 712fa9e4066Sahrens 713f18faf3fSek /* 714f18faf3fSek * This creates a snapshot under '.zfs/snapshot'. 715f18faf3fSek */ 716ecd6cf80Smarks /* ARGSUSED */ 717ecd6cf80Smarks static int 718ecd6cf80Smarks zfsctl_snapdir_mkdir(vnode_t *dvp, char *dirname, vattr_t *vap, vnode_t **vpp, 719da6c28aaSamw cred_t *cr, caller_context_t *cc, int flags, vsecattr_t *vsecp) 720ecd6cf80Smarks { 721ecd6cf80Smarks zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data; 722ecd6cf80Smarks char name[MAXNAMELEN]; 723ecd6cf80Smarks int err; 724ecd6cf80Smarks static enum symfollow follow = NO_FOLLOW; 725ecd6cf80Smarks static enum uio_seg seg = UIO_SYSSPACE; 726ecd6cf80Smarks 7276d1e0b89Smarks if (snapshot_namecheck(dirname, NULL, NULL) != 0) 7286d1e0b89Smarks return (EILSEQ); 7296d1e0b89Smarks 730ecd6cf80Smarks dmu_objset_name(zfsvfs->z_os, name); 731ecd6cf80Smarks 732ecd6cf80Smarks *vpp = NULL; 733ecd6cf80Smarks 734ecd6cf80Smarks err = zfs_secpolicy_snapshot_perms(name, cr); 735ecd6cf80Smarks if (err) 736ecd6cf80Smarks return (err); 737ecd6cf80Smarks 738ecd6cf80Smarks if (err == 0) { 739ecd6cf80Smarks err = dmu_objset_snapshot(name, dirname, B_FALSE); 740ecd6cf80Smarks if (err) 741ecd6cf80Smarks return (err); 742ecd6cf80Smarks err = lookupnameat(dirname, seg, follow, NULL, vpp, dvp); 743ecd6cf80Smarks } 744ecd6cf80Smarks 745ecd6cf80Smarks return (err); 746ecd6cf80Smarks } 747ecd6cf80Smarks 748fa9e4066Sahrens /* 749fa9e4066Sahrens * Lookup entry point for the 'snapshot' directory. Try to open the 750fa9e4066Sahrens * snapshot if it exist, creating the pseudo filesystem vnode as necessary. 751fa9e4066Sahrens * Perform a mount of the associated dataset on top of the vnode. 752fa9e4066Sahrens */ 753fa9e4066Sahrens /* ARGSUSED */ 754fa9e4066Sahrens static int 755fa9e4066Sahrens zfsctl_snapdir_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, pathname_t *pnp, 756da6c28aaSamw int flags, vnode_t *rdir, cred_t *cr, caller_context_t *ct, 757da6c28aaSamw int *direntflags, pathname_t *realpnp) 758fa9e4066Sahrens { 759fa9e4066Sahrens zfsctl_snapdir_t *sdp = dvp->v_data; 760fa9e4066Sahrens objset_t *snap; 761fa9e4066Sahrens char snapname[MAXNAMELEN]; 762ab04eb8eStimh char real[MAXNAMELEN]; 763fa9e4066Sahrens char *mountpoint; 764fa9e4066Sahrens zfs_snapentry_t *sep, search; 765fa9e4066Sahrens struct mounta margs; 766fa9e4066Sahrens vfs_t *vfsp; 767fa9e4066Sahrens size_t mountpoint_len; 768fa9e4066Sahrens avl_index_t where; 769fa9e4066Sahrens zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data; 770fa9e4066Sahrens int err; 771fa9e4066Sahrens 772da6c28aaSamw /* 773da6c28aaSamw * No extended attributes allowed under .zfs 774da6c28aaSamw */ 775da6c28aaSamw if (flags & LOOKUP_XATTR) 776da6c28aaSamw return (EINVAL); 777da6c28aaSamw 778fa9e4066Sahrens ASSERT(dvp->v_type == VDIR); 779fa9e4066Sahrens 780fa9e4066Sahrens if (gfs_lookup_dot(vpp, dvp, zfsvfs->z_ctldir, nm) == 0) 781fa9e4066Sahrens return (0); 782fa9e4066Sahrens 783fa9e4066Sahrens /* 784fa9e4066Sahrens * If we get a recursive call, that means we got called 785fa9e4066Sahrens * from the domount() code while it was trying to look up the 786fa9e4066Sahrens * spec (which looks like a local path for zfs). We need to 787fa9e4066Sahrens * add some flag to domount() to tell it not to do this lookup. 788fa9e4066Sahrens */ 789fa9e4066Sahrens if (MUTEX_HELD(&sdp->sd_lock)) 790fa9e4066Sahrens return (ENOENT); 791fa9e4066Sahrens 792fa9e4066Sahrens ZFS_ENTER(zfsvfs); 793fa9e4066Sahrens 794ab04eb8eStimh if (flags & FIGNORECASE) { 795ab04eb8eStimh boolean_t conflict = B_FALSE; 796ab04eb8eStimh 797ab04eb8eStimh err = dmu_snapshot_realname(zfsvfs->z_os, nm, real, 798ab04eb8eStimh MAXNAMELEN, &conflict); 799ab04eb8eStimh if (err == 0) { 800ab04eb8eStimh nm = real; 801ab04eb8eStimh } else if (err != ENOTSUP) { 802ab04eb8eStimh ZFS_EXIT(zfsvfs); 803ab04eb8eStimh return (err); 804ab04eb8eStimh } 805ab04eb8eStimh if (realpnp) 806ab04eb8eStimh (void) strlcpy(realpnp->pn_buf, nm, 807ab04eb8eStimh realpnp->pn_bufsize); 808ab04eb8eStimh if (conflict && direntflags) 809ab04eb8eStimh *direntflags = ED_CASE_CONFLICT; 810ab04eb8eStimh } 811ab04eb8eStimh 812fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 813fa9e4066Sahrens search.se_name = (char *)nm; 814fa9e4066Sahrens if ((sep = avl_find(&sdp->sd_snaps, &search, &where)) != NULL) { 815fa9e4066Sahrens *vpp = sep->se_root; 816fa9e4066Sahrens VN_HOLD(*vpp); 817bbf4a8dfSmaybee err = traverse(vpp); 818bbf4a8dfSmaybee if (err) { 819bbf4a8dfSmaybee VN_RELE(*vpp); 820bbf4a8dfSmaybee *vpp = NULL; 821bbf4a8dfSmaybee } else if (*vpp == sep->se_root) { 822bbf4a8dfSmaybee /* 823bbf4a8dfSmaybee * The snapshot was unmounted behind our backs, 824bbf4a8dfSmaybee * try to remount it. 825bbf4a8dfSmaybee */ 826fa9e4066Sahrens goto domount; 8278bf40bf0Sck } else { 8288bf40bf0Sck /* 8298bf40bf0Sck * VROOT was set during the traverse call. We need 8308bf40bf0Sck * to clear it since we're pretending to be part 8318bf40bf0Sck * of our parent's vfs. 8328bf40bf0Sck */ 8338bf40bf0Sck (*vpp)->v_flag &= ~VROOT; 834bb963f1cSmaybee } 835fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 836fa9e4066Sahrens ZFS_EXIT(zfsvfs); 837bbf4a8dfSmaybee return (err); 838fa9e4066Sahrens } 839fa9e4066Sahrens 840fa9e4066Sahrens /* 841fa9e4066Sahrens * The requested snapshot is not currently mounted, look it up. 842fa9e4066Sahrens */ 8435422900bSmaybee err = zfsctl_snapshot_zname(dvp, nm, MAXNAMELEN, snapname); 8445422900bSmaybee if (err) { 8455422900bSmaybee mutex_exit(&sdp->sd_lock); 8465422900bSmaybee ZFS_EXIT(zfsvfs); 8472283022cSmarks /* 8482283022cSmarks * handle "ls *" or "?" in a graceful manner, 8492283022cSmarks * forcing EILSEQ to ENOENT. 8502283022cSmarks * Since shell ultimately passes "*" or "?" as name to lookup 8512283022cSmarks */ 8522283022cSmarks return (err == EILSEQ ? ENOENT : err); 8535422900bSmaybee } 854fa9e4066Sahrens if (dmu_objset_open(snapname, DMU_OST_ZFS, 855745cd3c5Smaybee DS_MODE_USER | DS_MODE_READONLY, &snap) != 0) { 856fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 857fa9e4066Sahrens ZFS_EXIT(zfsvfs); 858fa9e4066Sahrens return (ENOENT); 859fa9e4066Sahrens } 860fa9e4066Sahrens 861fa9e4066Sahrens sep = kmem_alloc(sizeof (zfs_snapentry_t), KM_SLEEP); 862fa9e4066Sahrens sep->se_name = kmem_alloc(strlen(nm) + 1, KM_SLEEP); 863fa9e4066Sahrens (void) strcpy(sep->se_name, nm); 864fa9e4066Sahrens *vpp = sep->se_root = zfsctl_snapshot_mknode(dvp, dmu_objset_id(snap)); 865fa9e4066Sahrens avl_insert(&sdp->sd_snaps, sep, where); 866fa9e4066Sahrens 867fa9e4066Sahrens dmu_objset_close(snap); 868fa9e4066Sahrens domount: 869fa9e4066Sahrens mountpoint_len = strlen(refstr_value(dvp->v_vfsp->vfs_mntpt)) + 870fa9e4066Sahrens strlen("/.zfs/snapshot/") + strlen(nm) + 1; 871fa9e4066Sahrens mountpoint = kmem_alloc(mountpoint_len, KM_SLEEP); 872fa9e4066Sahrens (void) snprintf(mountpoint, mountpoint_len, "%s/.zfs/snapshot/%s", 873fa9e4066Sahrens refstr_value(dvp->v_vfsp->vfs_mntpt), nm); 874fa9e4066Sahrens 875fa9e4066Sahrens margs.spec = snapname; 876fa9e4066Sahrens margs.dir = mountpoint; 877fa9e4066Sahrens margs.flags = MS_SYSSPACE | MS_NOMNTTAB; 878fa9e4066Sahrens margs.fstype = "zfs"; 879fa9e4066Sahrens margs.dataptr = NULL; 880fa9e4066Sahrens margs.datalen = 0; 881fa9e4066Sahrens margs.optptr = NULL; 882fa9e4066Sahrens margs.optlen = 0; 883fa9e4066Sahrens 884fa9e4066Sahrens err = domount("zfs", &margs, *vpp, kcred, &vfsp); 885fa9e4066Sahrens kmem_free(mountpoint, mountpoint_len); 886fa9e4066Sahrens 88795c9592aSmaybee if (err == 0) { 88895c9592aSmaybee /* 88995c9592aSmaybee * Return the mounted root rather than the covered mount point. 890f18faf3fSek * Takes the GFS vnode at .zfs/snapshot/<snapname> and returns 891f18faf3fSek * the ZFS vnode mounted on top of the GFS node. This ZFS 892f18faf3fSek * vnode is the root the newly created vfsp. 89395c9592aSmaybee */ 89495c9592aSmaybee VFS_RELE(vfsp); 89595c9592aSmaybee err = traverse(vpp); 89695c9592aSmaybee } 897fa9e4066Sahrens 89895c9592aSmaybee if (err == 0) { 89995c9592aSmaybee /* 900f18faf3fSek * Fix up the root vnode mounted on .zfs/snapshot/<snapname>. 901ed097989Sek * 902ed097989Sek * This is where we lie about our v_vfsp in order to 903f18faf3fSek * make .zfs/snapshot/<snapname> accessible over NFS 904f18faf3fSek * without requiring manual mounts of <snapname>. 90595c9592aSmaybee */ 90695c9592aSmaybee ASSERT(VTOZ(*vpp)->z_zfsvfs != zfsvfs); 90795c9592aSmaybee VTOZ(*vpp)->z_zfsvfs->z_parent = zfsvfs; 90895c9592aSmaybee (*vpp)->v_vfsp = zfsvfs->z_vfs; 90995c9592aSmaybee (*vpp)->v_flag &= ~VROOT; 91095c9592aSmaybee } 911fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 912fa9e4066Sahrens ZFS_EXIT(zfsvfs); 913fa9e4066Sahrens 914bb963f1cSmaybee /* 915bb963f1cSmaybee * If we had an error, drop our hold on the vnode and 916bb963f1cSmaybee * zfsctl_snapshot_inactive() will clean up. 917bb963f1cSmaybee */ 918bb963f1cSmaybee if (err) { 91995c9592aSmaybee VN_RELE(*vpp); 920bb963f1cSmaybee *vpp = NULL; 921bb963f1cSmaybee } 92295c9592aSmaybee return (err); 923fa9e4066Sahrens } 924fa9e4066Sahrens 925743a77edSAlan Wright /* ARGSUSED */ 926743a77edSAlan Wright static int 927743a77edSAlan Wright zfsctl_shares_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, pathname_t *pnp, 928743a77edSAlan Wright int flags, vnode_t *rdir, cred_t *cr, caller_context_t *ct, 929743a77edSAlan Wright int *direntflags, pathname_t *realpnp) 930743a77edSAlan Wright { 931743a77edSAlan Wright zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data; 932743a77edSAlan Wright znode_t *dzp; 933743a77edSAlan Wright int error; 934743a77edSAlan Wright 935743a77edSAlan Wright ZFS_ENTER(zfsvfs); 936743a77edSAlan Wright 937743a77edSAlan Wright if (gfs_lookup_dot(vpp, dvp, zfsvfs->z_ctldir, nm) == 0) { 938743a77edSAlan Wright ZFS_EXIT(zfsvfs); 939743a77edSAlan Wright return (0); 940743a77edSAlan Wright } 941743a77edSAlan Wright 942*9e1320c0SMark Shellenbaum if (zfsvfs->z_shares_dir == 0) { 943*9e1320c0SMark Shellenbaum ZFS_EXIT(zfsvfs); 944*9e1320c0SMark Shellenbaum return (ENOTSUP); 945*9e1320c0SMark Shellenbaum } 946743a77edSAlan Wright if ((error = zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp)) == 0) 947743a77edSAlan Wright error = VOP_LOOKUP(ZTOV(dzp), nm, vpp, pnp, 948743a77edSAlan Wright flags, rdir, cr, ct, direntflags, realpnp); 949743a77edSAlan Wright 950743a77edSAlan Wright VN_RELE(ZTOV(dzp)); 951743a77edSAlan Wright ZFS_EXIT(zfsvfs); 952743a77edSAlan Wright 953743a77edSAlan Wright return (error); 954743a77edSAlan Wright } 955743a77edSAlan Wright 956fa9e4066Sahrens /* ARGSUSED */ 957fa9e4066Sahrens static int 958b38f0970Sck zfsctl_snapdir_readdir_cb(vnode_t *vp, void *dp, int *eofp, 959b38f0970Sck offset_t *offp, offset_t *nextp, void *data, int flags) 960fa9e4066Sahrens { 961fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 962fa9e4066Sahrens char snapname[MAXNAMELEN]; 963fa9e4066Sahrens uint64_t id, cookie; 964b38f0970Sck boolean_t case_conflict; 965b38f0970Sck int error; 966fa9e4066Sahrens 967fa9e4066Sahrens ZFS_ENTER(zfsvfs); 968fa9e4066Sahrens 969fa9e4066Sahrens cookie = *offp; 970b38f0970Sck error = dmu_snapshot_list_next(zfsvfs->z_os, MAXNAMELEN, snapname, &id, 971b38f0970Sck &cookie, &case_conflict); 972b38f0970Sck if (error) { 973fa9e4066Sahrens ZFS_EXIT(zfsvfs); 974b38f0970Sck if (error == ENOENT) { 975b38f0970Sck *eofp = 1; 976b38f0970Sck return (0); 977b38f0970Sck } 978b38f0970Sck return (error); 979fa9e4066Sahrens } 980fa9e4066Sahrens 981b38f0970Sck if (flags & V_RDDIR_ENTFLAGS) { 982b38f0970Sck edirent_t *eodp = dp; 983b38f0970Sck 984b38f0970Sck (void) strcpy(eodp->ed_name, snapname); 985b38f0970Sck eodp->ed_ino = ZFSCTL_INO_SNAP(id); 986b38f0970Sck eodp->ed_eflags = case_conflict ? ED_CASE_CONFLICT : 0; 987b38f0970Sck } else { 988b38f0970Sck struct dirent64 *odp = dp; 989b38f0970Sck 990b38f0970Sck (void) strcpy(odp->d_name, snapname); 991b38f0970Sck odp->d_ino = ZFSCTL_INO_SNAP(id); 992b38f0970Sck } 993fa9e4066Sahrens *nextp = cookie; 994fa9e4066Sahrens 995fa9e4066Sahrens ZFS_EXIT(zfsvfs); 996fa9e4066Sahrens 997fa9e4066Sahrens return (0); 998fa9e4066Sahrens } 999fa9e4066Sahrens 1000743a77edSAlan Wright /* ARGSUSED */ 1001743a77edSAlan Wright static int 1002743a77edSAlan Wright zfsctl_shares_readdir(vnode_t *vp, uio_t *uiop, cred_t *cr, int *eofp, 1003743a77edSAlan Wright caller_context_t *ct, int flags) 1004743a77edSAlan Wright { 1005743a77edSAlan Wright zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 1006743a77edSAlan Wright znode_t *dzp; 1007743a77edSAlan Wright int error; 1008743a77edSAlan Wright 1009743a77edSAlan Wright ZFS_ENTER(zfsvfs); 1010743a77edSAlan Wright 1011*9e1320c0SMark Shellenbaum if (zfsvfs->z_shares_dir == 0) { 1012*9e1320c0SMark Shellenbaum ZFS_EXIT(zfsvfs); 1013*9e1320c0SMark Shellenbaum return (ENOTSUP); 1014*9e1320c0SMark Shellenbaum } 1015743a77edSAlan Wright if ((error = zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp)) == 0) { 1016743a77edSAlan Wright error = VOP_READDIR(ZTOV(dzp), uiop, cr, eofp, ct, flags); 1017743a77edSAlan Wright VN_RELE(ZTOV(dzp)); 1018743a77edSAlan Wright } else { 1019743a77edSAlan Wright *eofp = 1; 1020743a77edSAlan Wright error = ENOENT; 1021743a77edSAlan Wright } 1022743a77edSAlan Wright 1023743a77edSAlan Wright ZFS_EXIT(zfsvfs); 1024743a77edSAlan Wright return (error); 1025743a77edSAlan Wright } 1026743a77edSAlan Wright 1027f18faf3fSek /* 1028f18faf3fSek * pvp is the '.zfs' directory (zfsctl_node_t). 1029f18faf3fSek * Creates vp, which is '.zfs/snapshot' (zfsctl_snapdir_t). 1030f18faf3fSek * 1031f18faf3fSek * This function is the callback to create a GFS vnode for '.zfs/snapshot' 1032f18faf3fSek * when a lookup is performed on .zfs for "snapshot". 1033f18faf3fSek */ 1034fa9e4066Sahrens vnode_t * 1035fa9e4066Sahrens zfsctl_mknode_snapdir(vnode_t *pvp) 1036fa9e4066Sahrens { 1037fa9e4066Sahrens vnode_t *vp; 1038fa9e4066Sahrens zfsctl_snapdir_t *sdp; 1039fa9e4066Sahrens 1040fa9e4066Sahrens vp = gfs_dir_create(sizeof (zfsctl_snapdir_t), pvp, 1041fa9e4066Sahrens zfsctl_ops_snapdir, NULL, NULL, MAXNAMELEN, 1042fa9e4066Sahrens zfsctl_snapdir_readdir_cb, NULL); 1043fa9e4066Sahrens sdp = vp->v_data; 1044fa9e4066Sahrens sdp->sd_node.zc_id = ZFSCTL_INO_SNAPDIR; 1045a32fded1Sek sdp->sd_node.zc_cmtime = ((zfsctl_node_t *)pvp->v_data)->zc_cmtime; 1046fa9e4066Sahrens mutex_init(&sdp->sd_lock, NULL, MUTEX_DEFAULT, NULL); 1047fa9e4066Sahrens avl_create(&sdp->sd_snaps, snapentry_compare, 1048fa9e4066Sahrens sizeof (zfs_snapentry_t), offsetof(zfs_snapentry_t, se_node)); 1049fa9e4066Sahrens return (vp); 1050fa9e4066Sahrens } 1051fa9e4066Sahrens 1052743a77edSAlan Wright vnode_t * 1053743a77edSAlan Wright zfsctl_mknode_shares(vnode_t *pvp) 1054743a77edSAlan Wright { 1055743a77edSAlan Wright vnode_t *vp; 1056743a77edSAlan Wright zfsctl_node_t *sdp; 1057743a77edSAlan Wright 1058743a77edSAlan Wright vp = gfs_dir_create(sizeof (zfsctl_node_t), pvp, 1059743a77edSAlan Wright zfsctl_ops_shares, NULL, NULL, MAXNAMELEN, 1060743a77edSAlan Wright NULL, NULL); 1061743a77edSAlan Wright sdp = vp->v_data; 1062743a77edSAlan Wright sdp->zc_cmtime = ((zfsctl_node_t *)pvp->v_data)->zc_cmtime; 1063743a77edSAlan Wright return (vp); 1064743a77edSAlan Wright 1065743a77edSAlan Wright } 1066743a77edSAlan Wright 1067743a77edSAlan Wright /* ARGSUSED */ 1068743a77edSAlan Wright static int 1069743a77edSAlan Wright zfsctl_shares_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr, 1070743a77edSAlan Wright caller_context_t *ct) 1071743a77edSAlan Wright { 1072743a77edSAlan Wright zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 1073743a77edSAlan Wright znode_t *dzp; 1074743a77edSAlan Wright int error; 1075743a77edSAlan Wright 1076743a77edSAlan Wright ZFS_ENTER(zfsvfs); 1077*9e1320c0SMark Shellenbaum if (zfsvfs->z_shares_dir == 0) { 1078*9e1320c0SMark Shellenbaum ZFS_EXIT(zfsvfs); 1079*9e1320c0SMark Shellenbaum return (ENOTSUP); 1080*9e1320c0SMark Shellenbaum } 1081743a77edSAlan Wright if ((error = zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp)) == 0) { 1082743a77edSAlan Wright error = VOP_GETATTR(ZTOV(dzp), vap, flags, cr, ct); 1083743a77edSAlan Wright VN_RELE(ZTOV(dzp)); 1084743a77edSAlan Wright } 1085743a77edSAlan Wright ZFS_EXIT(zfsvfs); 1086743a77edSAlan Wright return (error); 1087743a77edSAlan Wright 1088743a77edSAlan Wright 1089743a77edSAlan Wright } 1090743a77edSAlan Wright 1091fa9e4066Sahrens /* ARGSUSED */ 1092fa9e4066Sahrens static int 1093da6c28aaSamw zfsctl_snapdir_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr, 1094da6c28aaSamw caller_context_t *ct) 1095fa9e4066Sahrens { 1096fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 1097fa9e4066Sahrens zfsctl_snapdir_t *sdp = vp->v_data; 1098fa9e4066Sahrens 1099fa9e4066Sahrens ZFS_ENTER(zfsvfs); 1100fa9e4066Sahrens zfsctl_common_getattr(vp, vap); 1101fa9e4066Sahrens vap->va_nodeid = gfs_file_inode(vp); 1102fa9e4066Sahrens vap->va_nlink = vap->va_size = avl_numnodes(&sdp->sd_snaps) + 2; 1103fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1104fa9e4066Sahrens 1105fa9e4066Sahrens return (0); 1106fa9e4066Sahrens } 1107fa9e4066Sahrens 1108bb963f1cSmaybee /* ARGSUSED */ 1109fa9e4066Sahrens static void 1110da6c28aaSamw zfsctl_snapdir_inactive(vnode_t *vp, cred_t *cr, caller_context_t *ct) 1111fa9e4066Sahrens { 1112fa9e4066Sahrens zfsctl_snapdir_t *sdp = vp->v_data; 1113bb963f1cSmaybee void *private; 1114bb963f1cSmaybee 1115bb963f1cSmaybee private = gfs_dir_inactive(vp); 1116bb963f1cSmaybee if (private != NULL) { 1117bb963f1cSmaybee ASSERT(avl_numnodes(&sdp->sd_snaps) == 0); 1118bb963f1cSmaybee mutex_destroy(&sdp->sd_lock); 1119bb963f1cSmaybee avl_destroy(&sdp->sd_snaps); 1120bb963f1cSmaybee kmem_free(private, sizeof (zfsctl_snapdir_t)); 1121bb963f1cSmaybee } 1122fa9e4066Sahrens } 1123fa9e4066Sahrens 1124fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapdir[] = { 1125aa59c4cbSrsb { VOPNAME_OPEN, { .vop_open = zfsctl_common_open } }, 1126aa59c4cbSrsb { VOPNAME_CLOSE, { .vop_close = zfsctl_common_close } }, 1127aa59c4cbSrsb { VOPNAME_IOCTL, { .error = fs_inval } }, 1128aa59c4cbSrsb { VOPNAME_GETATTR, { .vop_getattr = zfsctl_snapdir_getattr } }, 1129aa59c4cbSrsb { VOPNAME_ACCESS, { .vop_access = zfsctl_common_access } }, 1130aa59c4cbSrsb { VOPNAME_RENAME, { .vop_rename = zfsctl_snapdir_rename } }, 1131aa59c4cbSrsb { VOPNAME_RMDIR, { .vop_rmdir = zfsctl_snapdir_remove } }, 1132ecd6cf80Smarks { VOPNAME_MKDIR, { .vop_mkdir = zfsctl_snapdir_mkdir } }, 1133aa59c4cbSrsb { VOPNAME_READDIR, { .vop_readdir = gfs_vop_readdir } }, 1134aa59c4cbSrsb { VOPNAME_LOOKUP, { .vop_lookup = zfsctl_snapdir_lookup } }, 1135aa59c4cbSrsb { VOPNAME_SEEK, { .vop_seek = fs_seek } }, 1136aa59c4cbSrsb { VOPNAME_INACTIVE, { .vop_inactive = zfsctl_snapdir_inactive } }, 1137aa59c4cbSrsb { VOPNAME_FID, { .vop_fid = zfsctl_common_fid } }, 1138fa9e4066Sahrens { NULL } 1139fa9e4066Sahrens }; 1140fa9e4066Sahrens 1141743a77edSAlan Wright static const fs_operation_def_t zfsctl_tops_shares[] = { 1142743a77edSAlan Wright { VOPNAME_OPEN, { .vop_open = zfsctl_common_open } }, 1143743a77edSAlan Wright { VOPNAME_CLOSE, { .vop_close = zfsctl_common_close } }, 1144743a77edSAlan Wright { VOPNAME_IOCTL, { .error = fs_inval } }, 1145743a77edSAlan Wright { VOPNAME_GETATTR, { .vop_getattr = zfsctl_shares_getattr } }, 1146743a77edSAlan Wright { VOPNAME_ACCESS, { .vop_access = zfsctl_common_access } }, 1147743a77edSAlan Wright { VOPNAME_READDIR, { .vop_readdir = zfsctl_shares_readdir } }, 1148743a77edSAlan Wright { VOPNAME_LOOKUP, { .vop_lookup = zfsctl_shares_lookup } }, 1149743a77edSAlan Wright { VOPNAME_SEEK, { .vop_seek = fs_seek } }, 1150743a77edSAlan Wright { VOPNAME_INACTIVE, { .vop_inactive = gfs_vop_inactive } }, 1151743a77edSAlan Wright { VOPNAME_FID, { .vop_fid = zfsctl_shares_fid } }, 1152743a77edSAlan Wright { NULL } 1153743a77edSAlan Wright }; 1154743a77edSAlan Wright 1155f18faf3fSek /* 1156f18faf3fSek * pvp is the GFS vnode '.zfs/snapshot'. 1157f18faf3fSek * 1158f18faf3fSek * This creates a GFS node under '.zfs/snapshot' representing each 1159f18faf3fSek * snapshot. This newly created GFS node is what we mount snapshot 1160f18faf3fSek * vfs_t's ontop of. 1161f18faf3fSek */ 1162fa9e4066Sahrens static vnode_t * 1163fa9e4066Sahrens zfsctl_snapshot_mknode(vnode_t *pvp, uint64_t objset) 1164fa9e4066Sahrens { 1165fa9e4066Sahrens vnode_t *vp; 1166fa9e4066Sahrens zfsctl_node_t *zcp; 1167fa9e4066Sahrens 1168fa9e4066Sahrens vp = gfs_dir_create(sizeof (zfsctl_node_t), pvp, 1169fa9e4066Sahrens zfsctl_ops_snapshot, NULL, NULL, MAXNAMELEN, NULL, NULL); 1170fa9e4066Sahrens zcp = vp->v_data; 1171fa9e4066Sahrens zcp->zc_id = objset; 11728bf40bf0Sck VFS_HOLD(vp->v_vfsp); 1173fa9e4066Sahrens 1174fa9e4066Sahrens return (vp); 1175fa9e4066Sahrens } 1176fa9e4066Sahrens 1177fa9e4066Sahrens static void 1178da6c28aaSamw zfsctl_snapshot_inactive(vnode_t *vp, cred_t *cr, caller_context_t *ct) 1179fa9e4066Sahrens { 1180fa9e4066Sahrens zfsctl_snapdir_t *sdp; 1181fa9e4066Sahrens zfs_snapentry_t *sep, *next; 1182fa9e4066Sahrens vnode_t *dvp; 1183fa9e4066Sahrens 1184ab04eb8eStimh VERIFY(gfs_dir_lookup(vp, "..", &dvp, cr, 0, NULL, NULL) == 0); 1185fa9e4066Sahrens sdp = dvp->v_data; 1186fa9e4066Sahrens 1187fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 1188fa9e4066Sahrens 1189fa9e4066Sahrens if (vp->v_count > 1) { 1190fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 1191fa9e4066Sahrens return; 1192fa9e4066Sahrens } 1193fa9e4066Sahrens ASSERT(!vn_ismntpt(vp)); 1194fa9e4066Sahrens 1195fa9e4066Sahrens sep = avl_first(&sdp->sd_snaps); 1196fa9e4066Sahrens while (sep != NULL) { 1197fa9e4066Sahrens next = AVL_NEXT(&sdp->sd_snaps, sep); 1198fa9e4066Sahrens 1199fa9e4066Sahrens if (sep->se_root == vp) { 1200fa9e4066Sahrens avl_remove(&sdp->sd_snaps, sep); 1201fa9e4066Sahrens kmem_free(sep->se_name, strlen(sep->se_name) + 1); 1202fa9e4066Sahrens kmem_free(sep, sizeof (zfs_snapentry_t)); 1203fa9e4066Sahrens break; 1204fa9e4066Sahrens } 1205fa9e4066Sahrens sep = next; 1206fa9e4066Sahrens } 1207fa9e4066Sahrens ASSERT(sep != NULL); 1208fa9e4066Sahrens 1209fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 1210fa9e4066Sahrens VN_RELE(dvp); 12118bf40bf0Sck VFS_RELE(vp->v_vfsp); 1212fa9e4066Sahrens 1213bb963f1cSmaybee /* 1214bb963f1cSmaybee * Dispose of the vnode for the snapshot mount point. 1215bb963f1cSmaybee * This is safe to do because once this entry has been removed 1216bb963f1cSmaybee * from the AVL tree, it can't be found again, so cannot become 1217bb963f1cSmaybee * "active". If we lookup the same name again we will end up 1218bb963f1cSmaybee * creating a new vnode. 1219bb963f1cSmaybee */ 1220da6c28aaSamw gfs_vop_inactive(vp, cr, ct); 1221fa9e4066Sahrens } 1222fa9e4066Sahrens 1223fa9e4066Sahrens 1224fa9e4066Sahrens /* 1225fa9e4066Sahrens * These VP's should never see the light of day. They should always 1226fa9e4066Sahrens * be covered. 1227fa9e4066Sahrens */ 1228fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapshot[] = { 1229aa59c4cbSrsb VOPNAME_INACTIVE, { .vop_inactive = zfsctl_snapshot_inactive }, 1230fa9e4066Sahrens NULL, NULL 1231fa9e4066Sahrens }; 1232fa9e4066Sahrens 1233fa9e4066Sahrens int 1234fa9e4066Sahrens zfsctl_lookup_objset(vfs_t *vfsp, uint64_t objsetid, zfsvfs_t **zfsvfsp) 1235fa9e4066Sahrens { 1236fa9e4066Sahrens zfsvfs_t *zfsvfs = vfsp->vfs_data; 1237fa9e4066Sahrens vnode_t *dvp, *vp; 1238fa9e4066Sahrens zfsctl_snapdir_t *sdp; 1239fa9e4066Sahrens zfsctl_node_t *zcp; 1240fa9e4066Sahrens zfs_snapentry_t *sep; 1241fa9e4066Sahrens int error; 1242fa9e4066Sahrens 1243fa9e4066Sahrens ASSERT(zfsvfs->z_ctldir != NULL); 1244fa9e4066Sahrens error = zfsctl_root_lookup(zfsvfs->z_ctldir, "snapshot", &dvp, 1245da6c28aaSamw NULL, 0, NULL, kcred, NULL, NULL, NULL); 1246fa9e4066Sahrens if (error != 0) 1247fa9e4066Sahrens return (error); 1248fa9e4066Sahrens sdp = dvp->v_data; 1249fa9e4066Sahrens 1250fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 1251fa9e4066Sahrens sep = avl_first(&sdp->sd_snaps); 1252fa9e4066Sahrens while (sep != NULL) { 1253fa9e4066Sahrens vp = sep->se_root; 1254fa9e4066Sahrens zcp = vp->v_data; 1255fa9e4066Sahrens if (zcp->zc_id == objsetid) 1256fa9e4066Sahrens break; 1257fa9e4066Sahrens 1258fa9e4066Sahrens sep = AVL_NEXT(&sdp->sd_snaps, sep); 1259fa9e4066Sahrens } 1260fa9e4066Sahrens 1261fa9e4066Sahrens if (sep != NULL) { 1262fa9e4066Sahrens VN_HOLD(vp); 1263f18faf3fSek /* 1264f18faf3fSek * Return the mounted root rather than the covered mount point. 1265f18faf3fSek * Takes the GFS vnode at .zfs/snapshot/<snapshot objsetid> 1266f18faf3fSek * and returns the ZFS vnode mounted on top of the GFS node. 1267f18faf3fSek * This ZFS vnode is the root of the vfs for objset 'objsetid'. 1268f18faf3fSek */ 1269fa9e4066Sahrens error = traverse(&vp); 1270bbf4a8dfSmaybee if (error == 0) { 1271bbf4a8dfSmaybee if (vp == sep->se_root) 1272bbf4a8dfSmaybee error = EINVAL; 1273bbf4a8dfSmaybee else 1274bbf4a8dfSmaybee *zfsvfsp = VTOZ(vp)->z_zfsvfs; 1275bbf4a8dfSmaybee } 1276fea70b54Snd mutex_exit(&sdp->sd_lock); 1277fa9e4066Sahrens VN_RELE(vp); 1278fa9e4066Sahrens } else { 1279fa9e4066Sahrens error = EINVAL; 1280fea70b54Snd mutex_exit(&sdp->sd_lock); 1281fa9e4066Sahrens } 1282fa9e4066Sahrens 1283fa9e4066Sahrens VN_RELE(dvp); 1284fa9e4066Sahrens 1285fa9e4066Sahrens return (error); 1286fa9e4066Sahrens } 1287fa9e4066Sahrens 1288fa9e4066Sahrens /* 1289fa9e4066Sahrens * Unmount any snapshots for the given filesystem. This is called from 1290fa9e4066Sahrens * zfs_umount() - if we have a ctldir, then go through and unmount all the 1291fa9e4066Sahrens * snapshots. 1292fa9e4066Sahrens */ 1293fa9e4066Sahrens int 1294fa9e4066Sahrens zfsctl_umount_snapshots(vfs_t *vfsp, int fflags, cred_t *cr) 1295fa9e4066Sahrens { 1296fa9e4066Sahrens zfsvfs_t *zfsvfs = vfsp->vfs_data; 12978bf40bf0Sck vnode_t *dvp; 1298fa9e4066Sahrens zfsctl_snapdir_t *sdp; 1299fa9e4066Sahrens zfs_snapentry_t *sep, *next; 1300fa9e4066Sahrens int error; 1301fa9e4066Sahrens 1302fa9e4066Sahrens ASSERT(zfsvfs->z_ctldir != NULL); 1303fa9e4066Sahrens error = zfsctl_root_lookup(zfsvfs->z_ctldir, "snapshot", &dvp, 1304da6c28aaSamw NULL, 0, NULL, cr, NULL, NULL, NULL); 1305fa9e4066Sahrens if (error != 0) 1306fa9e4066Sahrens return (error); 1307fa9e4066Sahrens sdp = dvp->v_data; 1308fa9e4066Sahrens 1309fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 1310fa9e4066Sahrens 1311fa9e4066Sahrens sep = avl_first(&sdp->sd_snaps); 1312fa9e4066Sahrens while (sep != NULL) { 1313fa9e4066Sahrens next = AVL_NEXT(&sdp->sd_snaps, sep); 1314fa9e4066Sahrens 1315fa9e4066Sahrens /* 1316fa9e4066Sahrens * If this snapshot is not mounted, then it must 1317fa9e4066Sahrens * have just been unmounted by somebody else, and 1318fa9e4066Sahrens * will be cleaned up by zfsctl_snapdir_inactive(). 1319fa9e4066Sahrens */ 13208bf40bf0Sck if (vn_ismntpt(sep->se_root)) { 13218bf40bf0Sck avl_remove(&sdp->sd_snaps, sep); 13228bf40bf0Sck error = zfsctl_unmount_snap(sep, fflags, cr); 1323fa9e4066Sahrens if (error) { 13248bf40bf0Sck avl_add(&sdp->sd_snaps, sep); 13258bf40bf0Sck break; 1326fa9e4066Sahrens } 1327fa9e4066Sahrens } 1328fa9e4066Sahrens sep = next; 1329fa9e4066Sahrens } 13308bf40bf0Sck 1331fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 1332fa9e4066Sahrens VN_RELE(dvp); 1333fa9e4066Sahrens 1334fa9e4066Sahrens return (error); 1335fa9e4066Sahrens } 1336