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 /* 22d39ee142SMark Shellenbaum * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23*be6fd75aSMatthew Ahrens * Copyright (c) 2013 by Delphix. All rights reserved. 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> 753b2aab18SMatthew Ahrens #include <sys/dsl_destroy.h> 76ecd6cf80Smarks #include <sys/dsl_deleg.h> 77fa9e4066Sahrens #include <sys/mount.h> 78ab04eb8eStimh #include <sys/sunddi.h> 79fa9e4066Sahrens 806d1e0b89Smarks #include "zfs_namecheck.h" 816d1e0b89Smarks 828bf40bf0Sck typedef struct zfsctl_node { 838bf40bf0Sck gfs_dir_t zc_gfs_private; 848bf40bf0Sck uint64_t zc_id; 858bf40bf0Sck timestruc_t zc_cmtime; /* ctime and mtime, always the same */ 868bf40bf0Sck } zfsctl_node_t; 878bf40bf0Sck 888bf40bf0Sck typedef struct zfsctl_snapdir { 898bf40bf0Sck zfsctl_node_t sd_node; 908bf40bf0Sck kmutex_t sd_lock; 918bf40bf0Sck avl_tree_t sd_snaps; 928bf40bf0Sck } zfsctl_snapdir_t; 938bf40bf0Sck 94fa9e4066Sahrens typedef struct { 95fa9e4066Sahrens char *se_name; 96fa9e4066Sahrens vnode_t *se_root; 97fa9e4066Sahrens avl_node_t se_node; 98fa9e4066Sahrens } zfs_snapentry_t; 99fa9e4066Sahrens 100fa9e4066Sahrens static int 101fa9e4066Sahrens snapentry_compare(const void *a, const void *b) 102fa9e4066Sahrens { 103fa9e4066Sahrens const zfs_snapentry_t *sa = a; 104fa9e4066Sahrens const zfs_snapentry_t *sb = b; 105fa9e4066Sahrens int ret = strcmp(sa->se_name, sb->se_name); 106fa9e4066Sahrens 107fa9e4066Sahrens if (ret < 0) 108fa9e4066Sahrens return (-1); 109fa9e4066Sahrens else if (ret > 0) 110fa9e4066Sahrens return (1); 111fa9e4066Sahrens else 112fa9e4066Sahrens return (0); 113fa9e4066Sahrens } 114fa9e4066Sahrens 115fa9e4066Sahrens vnodeops_t *zfsctl_ops_root; 116fa9e4066Sahrens vnodeops_t *zfsctl_ops_snapdir; 117fa9e4066Sahrens vnodeops_t *zfsctl_ops_snapshot; 118743a77edSAlan Wright vnodeops_t *zfsctl_ops_shares; 119743a77edSAlan Wright vnodeops_t *zfsctl_ops_shares_dir; 120fa9e4066Sahrens 121fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_root[]; 122fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapdir[]; 123fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapshot[]; 124743a77edSAlan Wright static const fs_operation_def_t zfsctl_tops_shares[]; 125fa9e4066Sahrens 126fa9e4066Sahrens static vnode_t *zfsctl_mknode_snapdir(vnode_t *); 127743a77edSAlan Wright static vnode_t *zfsctl_mknode_shares(vnode_t *); 128fa9e4066Sahrens static vnode_t *zfsctl_snapshot_mknode(vnode_t *, uint64_t objset); 1298bf40bf0Sck static int zfsctl_unmount_snap(zfs_snapentry_t *, int, cred_t *); 130fa9e4066Sahrens 131fa9e4066Sahrens static gfs_opsvec_t zfsctl_opsvec[] = { 132fa9e4066Sahrens { ".zfs", zfsctl_tops_root, &zfsctl_ops_root }, 133fa9e4066Sahrens { ".zfs/snapshot", zfsctl_tops_snapdir, &zfsctl_ops_snapdir }, 134fa9e4066Sahrens { ".zfs/snapshot/vnode", zfsctl_tops_snapshot, &zfsctl_ops_snapshot }, 135743a77edSAlan Wright { ".zfs/shares", zfsctl_tops_shares, &zfsctl_ops_shares_dir }, 136743a77edSAlan Wright { ".zfs/shares/vnode", zfsctl_tops_shares, &zfsctl_ops_shares }, 137fa9e4066Sahrens { NULL } 138fa9e4066Sahrens }; 139fa9e4066Sahrens 140fa9e4066Sahrens /* 141743a77edSAlan Wright * Root directory elements. We only have two entries 142743a77edSAlan Wright * snapshot and shares. 143fa9e4066Sahrens */ 144fa9e4066Sahrens static gfs_dirent_t zfsctl_root_entries[] = { 145fa9e4066Sahrens { "snapshot", zfsctl_mknode_snapdir, GFS_CACHE_VNODE }, 146743a77edSAlan Wright { "shares", zfsctl_mknode_shares, GFS_CACHE_VNODE }, 147fa9e4066Sahrens { NULL } 148fa9e4066Sahrens }; 149fa9e4066Sahrens 150fa9e4066Sahrens /* include . and .. in the calculation */ 151fa9e4066Sahrens #define NROOT_ENTRIES ((sizeof (zfsctl_root_entries) / \ 152fa9e4066Sahrens sizeof (gfs_dirent_t)) + 1) 153fa9e4066Sahrens 154fa9e4066Sahrens 155fa9e4066Sahrens /* 156fa9e4066Sahrens * Initialize the various GFS pieces we'll need to create and manipulate .zfs 157fa9e4066Sahrens * directories. This is called from the ZFS init routine, and initializes the 158fa9e4066Sahrens * vnode ops vectors that we'll be using. 159fa9e4066Sahrens */ 160fa9e4066Sahrens void 161fa9e4066Sahrens zfsctl_init(void) 162fa9e4066Sahrens { 163fa9e4066Sahrens VERIFY(gfs_make_opsvec(zfsctl_opsvec) == 0); 164fa9e4066Sahrens } 165fa9e4066Sahrens 166fa9e4066Sahrens void 167fa9e4066Sahrens zfsctl_fini(void) 168fa9e4066Sahrens { 169fa9e4066Sahrens /* 170fa9e4066Sahrens * Remove vfsctl vnode ops 171fa9e4066Sahrens */ 172fa9e4066Sahrens if (zfsctl_ops_root) 173fa9e4066Sahrens vn_freevnodeops(zfsctl_ops_root); 174fa9e4066Sahrens if (zfsctl_ops_snapdir) 175fa9e4066Sahrens vn_freevnodeops(zfsctl_ops_snapdir); 176fa9e4066Sahrens if (zfsctl_ops_snapshot) 177fa9e4066Sahrens vn_freevnodeops(zfsctl_ops_snapshot); 178743a77edSAlan Wright if (zfsctl_ops_shares) 179743a77edSAlan Wright vn_freevnodeops(zfsctl_ops_shares); 180743a77edSAlan Wright if (zfsctl_ops_shares_dir) 181743a77edSAlan Wright vn_freevnodeops(zfsctl_ops_shares_dir); 182fa9e4066Sahrens 183fa9e4066Sahrens zfsctl_ops_root = NULL; 184fa9e4066Sahrens zfsctl_ops_snapdir = NULL; 185fa9e4066Sahrens zfsctl_ops_snapshot = NULL; 186743a77edSAlan Wright zfsctl_ops_shares = NULL; 187743a77edSAlan Wright zfsctl_ops_shares_dir = NULL; 188fa9e4066Sahrens } 189fa9e4066Sahrens 190d39ee142SMark Shellenbaum boolean_t 191d39ee142SMark Shellenbaum zfsctl_is_node(vnode_t *vp) 192d39ee142SMark Shellenbaum { 193d39ee142SMark Shellenbaum return (vn_matchops(vp, zfsctl_ops_root) || 194d39ee142SMark Shellenbaum vn_matchops(vp, zfsctl_ops_snapdir) || 195d39ee142SMark Shellenbaum vn_matchops(vp, zfsctl_ops_snapshot) || 196d39ee142SMark Shellenbaum vn_matchops(vp, zfsctl_ops_shares) || 197d39ee142SMark Shellenbaum vn_matchops(vp, zfsctl_ops_shares_dir)); 198d39ee142SMark Shellenbaum 199d39ee142SMark Shellenbaum } 200d39ee142SMark Shellenbaum 201fa9e4066Sahrens /* 202743a77edSAlan Wright * Return the inode number associated with the 'snapshot' or 203743a77edSAlan Wright * 'shares' directory. 204fa9e4066Sahrens */ 205fa9e4066Sahrens /* ARGSUSED */ 206fa9e4066Sahrens static ino64_t 207fa9e4066Sahrens zfsctl_root_inode_cb(vnode_t *vp, int index) 208fa9e4066Sahrens { 209743a77edSAlan Wright zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 210743a77edSAlan Wright 211743a77edSAlan Wright ASSERT(index <= 2); 212743a77edSAlan Wright 213743a77edSAlan Wright if (index == 0) 214743a77edSAlan Wright return (ZFSCTL_INO_SNAPDIR); 215743a77edSAlan Wright 216743a77edSAlan Wright return (zfsvfs->z_shares_dir); 217fa9e4066Sahrens } 218fa9e4066Sahrens 219fa9e4066Sahrens /* 220fa9e4066Sahrens * Create the '.zfs' directory. This directory is cached as part of the VFS 221fa9e4066Sahrens * structure. This results in a hold on the vfs_t. The code in zfs_umount() 222fa9e4066Sahrens * therefore checks against a vfs_count of 2 instead of 1. This reference 223fa9e4066Sahrens * is removed when the ctldir is destroyed in the unmount. 224fa9e4066Sahrens */ 225fa9e4066Sahrens void 226fa9e4066Sahrens zfsctl_create(zfsvfs_t *zfsvfs) 227fa9e4066Sahrens { 228a32fded1Sek vnode_t *vp, *rvp; 229fa9e4066Sahrens zfsctl_node_t *zcp; 2300a586ceaSMark Shellenbaum uint64_t crtime[2]; 231fa9e4066Sahrens 232fa9e4066Sahrens ASSERT(zfsvfs->z_ctldir == NULL); 233fa9e4066Sahrens 234fa9e4066Sahrens vp = gfs_root_create(sizeof (zfsctl_node_t), zfsvfs->z_vfs, 235fa9e4066Sahrens zfsctl_ops_root, ZFSCTL_INO_ROOT, zfsctl_root_entries, 236fa9e4066Sahrens zfsctl_root_inode_cb, MAXNAMELEN, NULL, NULL); 237fa9e4066Sahrens zcp = vp->v_data; 238fa9e4066Sahrens zcp->zc_id = ZFSCTL_INO_ROOT; 239fa9e4066Sahrens 240a32fded1Sek VERIFY(VFS_ROOT(zfsvfs->z_vfs, &rvp) == 0); 2410a586ceaSMark Shellenbaum VERIFY(0 == sa_lookup(VTOZ(rvp)->z_sa_hdl, SA_ZPL_CRTIME(zfsvfs), 2420a586ceaSMark Shellenbaum &crtime, sizeof (crtime))); 2430a586ceaSMark Shellenbaum ZFS_TIME_DECODE(&zcp->zc_cmtime, crtime); 244a32fded1Sek VN_RELE(rvp); 245a32fded1Sek 246fa9e4066Sahrens /* 247fa9e4066Sahrens * We're only faking the fact that we have a root of a filesystem for 248fa9e4066Sahrens * the sake of the GFS interfaces. Undo the flag manipulation it did 249fa9e4066Sahrens * for us. 250fa9e4066Sahrens */ 251fa9e4066Sahrens vp->v_flag &= ~(VROOT | VNOCACHE | VNOMAP | VNOSWAP | VNOMOUNT); 252fa9e4066Sahrens 253fa9e4066Sahrens zfsvfs->z_ctldir = vp; 254fa9e4066Sahrens } 255fa9e4066Sahrens 256fa9e4066Sahrens /* 2578afd4dd6Sperrin * Destroy the '.zfs' directory. Only called when the filesystem is unmounted. 2588afd4dd6Sperrin * There might still be more references if we were force unmounted, but only 2598afd4dd6Sperrin * new zfs_inactive() calls can occur and they don't reference .zfs 260fa9e4066Sahrens */ 261fa9e4066Sahrens void 262fa9e4066Sahrens zfsctl_destroy(zfsvfs_t *zfsvfs) 263fa9e4066Sahrens { 264fa9e4066Sahrens VN_RELE(zfsvfs->z_ctldir); 265fa9e4066Sahrens zfsvfs->z_ctldir = NULL; 266fa9e4066Sahrens } 267fa9e4066Sahrens 268fa9e4066Sahrens /* 269fa9e4066Sahrens * Given a root znode, retrieve the associated .zfs directory. 270fa9e4066Sahrens * Add a hold to the vnode and return it. 271fa9e4066Sahrens */ 272fa9e4066Sahrens vnode_t * 273fa9e4066Sahrens zfsctl_root(znode_t *zp) 274fa9e4066Sahrens { 275fa9e4066Sahrens ASSERT(zfs_has_ctldir(zp)); 276fa9e4066Sahrens VN_HOLD(zp->z_zfsvfs->z_ctldir); 277fa9e4066Sahrens return (zp->z_zfsvfs->z_ctldir); 278fa9e4066Sahrens } 279fa9e4066Sahrens 280fa9e4066Sahrens /* 281fa9e4066Sahrens * Common open routine. Disallow any write access. 282fa9e4066Sahrens */ 283fa9e4066Sahrens /* ARGSUSED */ 284fa9e4066Sahrens static int 285da6c28aaSamw zfsctl_common_open(vnode_t **vpp, int flags, cred_t *cr, caller_context_t *ct) 286fa9e4066Sahrens { 287fa9e4066Sahrens if (flags & FWRITE) 288*be6fd75aSMatthew Ahrens return (SET_ERROR(EACCES)); 289fa9e4066Sahrens 290fa9e4066Sahrens return (0); 291fa9e4066Sahrens } 292fa9e4066Sahrens 293fa9e4066Sahrens /* 294fa9e4066Sahrens * Common close routine. Nothing to do here. 295fa9e4066Sahrens */ 296fa9e4066Sahrens /* ARGSUSED */ 297fa9e4066Sahrens static int 298fa9e4066Sahrens zfsctl_common_close(vnode_t *vpp, int flags, int count, offset_t off, 299da6c28aaSamw cred_t *cr, caller_context_t *ct) 300fa9e4066Sahrens { 301fa9e4066Sahrens return (0); 302fa9e4066Sahrens } 303fa9e4066Sahrens 304fa9e4066Sahrens /* 305fa9e4066Sahrens * Common access routine. Disallow writes. 306fa9e4066Sahrens */ 307fa9e4066Sahrens /* ARGSUSED */ 308fa9e4066Sahrens static int 309da6c28aaSamw zfsctl_common_access(vnode_t *vp, int mode, int flags, cred_t *cr, 310da6c28aaSamw caller_context_t *ct) 311fa9e4066Sahrens { 31260030f27SMark Shellenbaum if (flags & V_ACE_MASK) { 31360030f27SMark Shellenbaum if (mode & ACE_ALL_WRITE_PERMS) 314*be6fd75aSMatthew Ahrens return (SET_ERROR(EACCES)); 31560030f27SMark Shellenbaum } else { 31660030f27SMark Shellenbaum if (mode & VWRITE) 317*be6fd75aSMatthew Ahrens return (SET_ERROR(EACCES)); 31860030f27SMark Shellenbaum } 319fa9e4066Sahrens 320fa9e4066Sahrens return (0); 321fa9e4066Sahrens } 322fa9e4066Sahrens 323fa9e4066Sahrens /* 324fa9e4066Sahrens * Common getattr function. Fill in basic information. 325fa9e4066Sahrens */ 326fa9e4066Sahrens static void 327fa9e4066Sahrens zfsctl_common_getattr(vnode_t *vp, vattr_t *vap) 328fa9e4066Sahrens { 329a32fded1Sek timestruc_t now; 330fa9e4066Sahrens 331fa9e4066Sahrens vap->va_uid = 0; 332fa9e4066Sahrens vap->va_gid = 0; 333fa9e4066Sahrens vap->va_rdev = 0; 334fa9e4066Sahrens /* 33571eb0538SChris Kirby * We are a purely virtual object, so we have no 336fa9e4066Sahrens * blocksize or allocated blocks. 337fa9e4066Sahrens */ 338fa9e4066Sahrens vap->va_blksize = 0; 339fa9e4066Sahrens vap->va_nblocks = 0; 340fa9e4066Sahrens vap->va_seq = 0; 341fa9e4066Sahrens vap->va_fsid = vp->v_vfsp->vfs_dev; 342fa9e4066Sahrens vap->va_mode = S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP | 343fa9e4066Sahrens S_IROTH | S_IXOTH; 344fa9e4066Sahrens vap->va_type = VDIR; 345fa9e4066Sahrens /* 346a32fded1Sek * We live in the now (for atime). 347fa9e4066Sahrens */ 348fa9e4066Sahrens gethrestime(&now); 349a32fded1Sek vap->va_atime = now; 350fa9e4066Sahrens } 351fa9e4066Sahrens 352da6c28aaSamw /*ARGSUSED*/ 353fa9e4066Sahrens static int 354da6c28aaSamw zfsctl_common_fid(vnode_t *vp, fid_t *fidp, caller_context_t *ct) 355fa9e4066Sahrens { 356fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 357fa9e4066Sahrens zfsctl_node_t *zcp = vp->v_data; 358fa9e4066Sahrens uint64_t object = zcp->zc_id; 359fa9e4066Sahrens zfid_short_t *zfid; 360fa9e4066Sahrens int i; 361fa9e4066Sahrens 362fa9e4066Sahrens ZFS_ENTER(zfsvfs); 363fa9e4066Sahrens 364fa9e4066Sahrens if (fidp->fid_len < SHORT_FID_LEN) { 365fa9e4066Sahrens fidp->fid_len = SHORT_FID_LEN; 3660f2dc02eSek ZFS_EXIT(zfsvfs); 367*be6fd75aSMatthew Ahrens return (SET_ERROR(ENOSPC)); 368fa9e4066Sahrens } 369fa9e4066Sahrens 370fa9e4066Sahrens zfid = (zfid_short_t *)fidp; 371fa9e4066Sahrens 372fa9e4066Sahrens zfid->zf_len = SHORT_FID_LEN; 373fa9e4066Sahrens 374fa9e4066Sahrens for (i = 0; i < sizeof (zfid->zf_object); i++) 375fa9e4066Sahrens zfid->zf_object[i] = (uint8_t)(object >> (8 * i)); 376fa9e4066Sahrens 377fa9e4066Sahrens /* .zfs znodes always have a generation number of 0 */ 378fa9e4066Sahrens for (i = 0; i < sizeof (zfid->zf_gen); i++) 379fa9e4066Sahrens zfid->zf_gen[i] = 0; 380fa9e4066Sahrens 381fa9e4066Sahrens ZFS_EXIT(zfsvfs); 382fa9e4066Sahrens return (0); 383fa9e4066Sahrens } 384fa9e4066Sahrens 385743a77edSAlan Wright 386743a77edSAlan Wright /*ARGSUSED*/ 387743a77edSAlan Wright static int 388743a77edSAlan Wright zfsctl_shares_fid(vnode_t *vp, fid_t *fidp, caller_context_t *ct) 389743a77edSAlan Wright { 390743a77edSAlan Wright zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 391743a77edSAlan Wright znode_t *dzp; 392743a77edSAlan Wright int error; 393743a77edSAlan Wright 394743a77edSAlan Wright ZFS_ENTER(zfsvfs); 3959e1320c0SMark Shellenbaum 3969e1320c0SMark Shellenbaum if (zfsvfs->z_shares_dir == 0) { 3979e1320c0SMark Shellenbaum ZFS_EXIT(zfsvfs); 398*be6fd75aSMatthew Ahrens return (SET_ERROR(ENOTSUP)); 3999e1320c0SMark Shellenbaum } 4009e1320c0SMark Shellenbaum 401743a77edSAlan Wright if ((error = zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp)) == 0) { 402743a77edSAlan Wright error = VOP_FID(ZTOV(dzp), fidp, ct); 403743a77edSAlan Wright VN_RELE(ZTOV(dzp)); 404743a77edSAlan Wright } 405743a77edSAlan Wright 406743a77edSAlan Wright ZFS_EXIT(zfsvfs); 407743a77edSAlan Wright return (error); 408743a77edSAlan Wright } 409fa9e4066Sahrens /* 410fa9e4066Sahrens * .zfs inode namespace 411fa9e4066Sahrens * 412fa9e4066Sahrens * We need to generate unique inode numbers for all files and directories 413fa9e4066Sahrens * within the .zfs pseudo-filesystem. We use the following scheme: 414fa9e4066Sahrens * 415fa9e4066Sahrens * ENTRY ZFSCTL_INODE 416fa9e4066Sahrens * .zfs 1 417fa9e4066Sahrens * .zfs/snapshot 2 418fa9e4066Sahrens * .zfs/snapshot/<snap> objectid(snap) 419fa9e4066Sahrens */ 420fa9e4066Sahrens 421fa9e4066Sahrens #define ZFSCTL_INO_SNAP(id) (id) 422fa9e4066Sahrens 423fa9e4066Sahrens /* 424fa9e4066Sahrens * Get root directory attributes. 425fa9e4066Sahrens */ 426fa9e4066Sahrens /* ARGSUSED */ 427fa9e4066Sahrens static int 428da6c28aaSamw zfsctl_root_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr, 429da6c28aaSamw caller_context_t *ct) 430fa9e4066Sahrens { 431fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 43271eb0538SChris Kirby zfsctl_node_t *zcp = vp->v_data; 433fa9e4066Sahrens 434fa9e4066Sahrens ZFS_ENTER(zfsvfs); 435fa9e4066Sahrens vap->va_nodeid = ZFSCTL_INO_ROOT; 436fa9e4066Sahrens vap->va_nlink = vap->va_size = NROOT_ENTRIES; 43771eb0538SChris Kirby vap->va_mtime = vap->va_ctime = zcp->zc_cmtime; 438fa9e4066Sahrens 439fa9e4066Sahrens zfsctl_common_getattr(vp, vap); 440fa9e4066Sahrens ZFS_EXIT(zfsvfs); 441fa9e4066Sahrens 442fa9e4066Sahrens return (0); 443fa9e4066Sahrens } 444fa9e4066Sahrens 445fa9e4066Sahrens /* 446fa9e4066Sahrens * Special case the handling of "..". 447fa9e4066Sahrens */ 448fa9e4066Sahrens /* ARGSUSED */ 449fa9e4066Sahrens int 450fa9e4066Sahrens zfsctl_root_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, pathname_t *pnp, 451da6c28aaSamw int flags, vnode_t *rdir, cred_t *cr, caller_context_t *ct, 452da6c28aaSamw int *direntflags, pathname_t *realpnp) 453fa9e4066Sahrens { 454fa9e4066Sahrens zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data; 455fa9e4066Sahrens int err; 456fa9e4066Sahrens 457da6c28aaSamw /* 458da6c28aaSamw * No extended attributes allowed under .zfs 459da6c28aaSamw */ 460da6c28aaSamw if (flags & LOOKUP_XATTR) 461*be6fd75aSMatthew Ahrens return (SET_ERROR(EINVAL)); 462da6c28aaSamw 463fa9e4066Sahrens ZFS_ENTER(zfsvfs); 464fa9e4066Sahrens 465fa9e4066Sahrens if (strcmp(nm, "..") == 0) { 466fa9e4066Sahrens err = VFS_ROOT(dvp->v_vfsp, vpp); 467fa9e4066Sahrens } else { 468ab04eb8eStimh err = gfs_vop_lookup(dvp, nm, vpp, pnp, flags, rdir, 469ab04eb8eStimh cr, ct, direntflags, realpnp); 470fa9e4066Sahrens } 471fa9e4066Sahrens 472fa9e4066Sahrens ZFS_EXIT(zfsvfs); 473fa9e4066Sahrens 474fa9e4066Sahrens return (err); 475fa9e4066Sahrens } 476fa9e4066Sahrens 47760030f27SMark Shellenbaum static int 47860030f27SMark Shellenbaum zfsctl_pathconf(vnode_t *vp, int cmd, ulong_t *valp, cred_t *cr, 47960030f27SMark Shellenbaum caller_context_t *ct) 48060030f27SMark Shellenbaum { 48160030f27SMark Shellenbaum /* 48260030f27SMark Shellenbaum * We only care about ACL_ENABLED so that libsec can 48360030f27SMark Shellenbaum * display ACL correctly and not default to POSIX draft. 48460030f27SMark Shellenbaum */ 48560030f27SMark Shellenbaum if (cmd == _PC_ACL_ENABLED) { 48660030f27SMark Shellenbaum *valp = _ACL_ACE_ENABLED; 48760030f27SMark Shellenbaum return (0); 48860030f27SMark Shellenbaum } 48960030f27SMark Shellenbaum 49060030f27SMark Shellenbaum return (fs_pathconf(vp, cmd, valp, cr, ct)); 49160030f27SMark Shellenbaum } 49260030f27SMark Shellenbaum 493fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_root[] = { 494aa59c4cbSrsb { VOPNAME_OPEN, { .vop_open = zfsctl_common_open } }, 495aa59c4cbSrsb { VOPNAME_CLOSE, { .vop_close = zfsctl_common_close } }, 496aa59c4cbSrsb { VOPNAME_IOCTL, { .error = fs_inval } }, 497aa59c4cbSrsb { VOPNAME_GETATTR, { .vop_getattr = zfsctl_root_getattr } }, 498aa59c4cbSrsb { VOPNAME_ACCESS, { .vop_access = zfsctl_common_access } }, 499aa59c4cbSrsb { VOPNAME_READDIR, { .vop_readdir = gfs_vop_readdir } }, 500aa59c4cbSrsb { VOPNAME_LOOKUP, { .vop_lookup = zfsctl_root_lookup } }, 501aa59c4cbSrsb { VOPNAME_SEEK, { .vop_seek = fs_seek } }, 502aa59c4cbSrsb { VOPNAME_INACTIVE, { .vop_inactive = gfs_vop_inactive } }, 50360030f27SMark Shellenbaum { VOPNAME_PATHCONF, { .vop_pathconf = zfsctl_pathconf } }, 504aa59c4cbSrsb { VOPNAME_FID, { .vop_fid = zfsctl_common_fid } }, 505fa9e4066Sahrens { NULL } 506fa9e4066Sahrens }; 507fa9e4066Sahrens 508fa9e4066Sahrens static int 509fa9e4066Sahrens zfsctl_snapshot_zname(vnode_t *vp, const char *name, int len, char *zname) 510fa9e4066Sahrens { 511fa9e4066Sahrens objset_t *os = ((zfsvfs_t *)((vp)->v_vfsp->vfs_data))->z_os; 512fa9e4066Sahrens 5136d1e0b89Smarks if (snapshot_namecheck(name, NULL, NULL) != 0) 514*be6fd75aSMatthew Ahrens return (SET_ERROR(EILSEQ)); 515fa9e4066Sahrens dmu_objset_name(os, zname); 5165422900bSmaybee if (strlen(zname) + 1 + strlen(name) >= len) 517*be6fd75aSMatthew Ahrens return (SET_ERROR(ENAMETOOLONG)); 5185422900bSmaybee (void) strcat(zname, "@"); 519fa9e4066Sahrens (void) strcat(zname, name); 520fa9e4066Sahrens return (0); 521fa9e4066Sahrens } 522fa9e4066Sahrens 5238bf40bf0Sck static int 5248bf40bf0Sck zfsctl_unmount_snap(zfs_snapentry_t *sep, int fflags, cred_t *cr) 525fa9e4066Sahrens { 5268bf40bf0Sck vnode_t *svp = sep->se_root; 5278bf40bf0Sck int error; 528fa9e4066Sahrens 5298bf40bf0Sck ASSERT(vn_ismntpt(svp)); 530fa9e4066Sahrens 531fa9e4066Sahrens /* this will be dropped by dounmount() */ 5328bf40bf0Sck if ((error = vn_vfswlock(svp)) != 0) 5338bf40bf0Sck return (error); 534fa9e4066Sahrens 5358bf40bf0Sck VN_HOLD(svp); 5368bf40bf0Sck error = dounmount(vn_mountedvfs(svp), fflags, cr); 5378bf40bf0Sck if (error) { 5388bf40bf0Sck VN_RELE(svp); 5398bf40bf0Sck return (error); 540bbf4a8dfSmaybee } 541142ae85dSChris Kirby 5428bf40bf0Sck /* 5438bf40bf0Sck * We can't use VN_RELE(), as that will try to invoke 5448bf40bf0Sck * zfsctl_snapdir_inactive(), which would cause us to destroy 5458bf40bf0Sck * the sd_lock mutex held by our caller. 5468bf40bf0Sck */ 5478bf40bf0Sck ASSERT(svp->v_count == 1); 5488bf40bf0Sck gfs_vop_inactive(svp, cr, NULL); 549fa9e4066Sahrens 550fa9e4066Sahrens kmem_free(sep->se_name, strlen(sep->se_name) + 1); 551fa9e4066Sahrens kmem_free(sep, sizeof (zfs_snapentry_t)); 552fa9e4066Sahrens 553fa9e4066Sahrens return (0); 554fa9e4066Sahrens } 555fa9e4066Sahrens 5565422900bSmaybee static void 557fa9e4066Sahrens zfsctl_rename_snap(zfsctl_snapdir_t *sdp, zfs_snapentry_t *sep, const char *nm) 558fa9e4066Sahrens { 559fa9e4066Sahrens avl_index_t where; 560fa9e4066Sahrens vfs_t *vfsp; 561fa9e4066Sahrens refstr_t *pathref; 562fa9e4066Sahrens char newpath[MAXNAMELEN]; 563fa9e4066Sahrens char *tail; 564fa9e4066Sahrens 565fa9e4066Sahrens ASSERT(MUTEX_HELD(&sdp->sd_lock)); 566fa9e4066Sahrens ASSERT(sep != NULL); 567fa9e4066Sahrens 568fa9e4066Sahrens vfsp = vn_mountedvfs(sep->se_root); 569fa9e4066Sahrens ASSERT(vfsp != NULL); 570fa9e4066Sahrens 5715422900bSmaybee vfs_lock_wait(vfsp); 572fa9e4066Sahrens 573fa9e4066Sahrens /* 574fa9e4066Sahrens * Change the name in the AVL tree. 575fa9e4066Sahrens */ 576fa9e4066Sahrens avl_remove(&sdp->sd_snaps, sep); 577fa9e4066Sahrens kmem_free(sep->se_name, strlen(sep->se_name) + 1); 578fa9e4066Sahrens sep->se_name = kmem_alloc(strlen(nm) + 1, KM_SLEEP); 579fa9e4066Sahrens (void) strcpy(sep->se_name, nm); 580fa9e4066Sahrens VERIFY(avl_find(&sdp->sd_snaps, sep, &where) == NULL); 581fa9e4066Sahrens avl_insert(&sdp->sd_snaps, sep, where); 582fa9e4066Sahrens 583fa9e4066Sahrens /* 584fa9e4066Sahrens * Change the current mountpoint info: 585fa9e4066Sahrens * - update the tail of the mntpoint path 586fa9e4066Sahrens * - update the tail of the resource path 587fa9e4066Sahrens */ 588fa9e4066Sahrens pathref = vfs_getmntpoint(vfsp); 5890b69c2f0Sahrens (void) strncpy(newpath, refstr_value(pathref), sizeof (newpath)); 5900b69c2f0Sahrens VERIFY((tail = strrchr(newpath, '/')) != NULL); 5910b69c2f0Sahrens *(tail+1) = '\0'; 5920b69c2f0Sahrens ASSERT3U(strlen(newpath) + strlen(nm), <, sizeof (newpath)); 593fa9e4066Sahrens (void) strcat(newpath, nm); 594fa9e4066Sahrens refstr_rele(pathref); 595d7de0ceaSRobert Harris vfs_setmntpoint(vfsp, newpath, 0); 596fa9e4066Sahrens 597fa9e4066Sahrens pathref = vfs_getresource(vfsp); 5980b69c2f0Sahrens (void) strncpy(newpath, refstr_value(pathref), sizeof (newpath)); 5990b69c2f0Sahrens VERIFY((tail = strrchr(newpath, '@')) != NULL); 6000b69c2f0Sahrens *(tail+1) = '\0'; 6010b69c2f0Sahrens ASSERT3U(strlen(newpath) + strlen(nm), <, sizeof (newpath)); 602fa9e4066Sahrens (void) strcat(newpath, nm); 603fa9e4066Sahrens refstr_rele(pathref); 604d7de0ceaSRobert Harris vfs_setresource(vfsp, newpath, 0); 605fa9e4066Sahrens 606fa9e4066Sahrens vfs_unlock(vfsp); 607fa9e4066Sahrens } 608fa9e4066Sahrens 609da6c28aaSamw /*ARGSUSED*/ 610fa9e4066Sahrens static int 611fa9e4066Sahrens zfsctl_snapdir_rename(vnode_t *sdvp, char *snm, vnode_t *tdvp, char *tnm, 612da6c28aaSamw cred_t *cr, caller_context_t *ct, int flags) 613fa9e4066Sahrens { 614fa9e4066Sahrens zfsctl_snapdir_t *sdp = sdvp->v_data; 615fa9e4066Sahrens zfs_snapentry_t search, *sep; 616ab04eb8eStimh zfsvfs_t *zfsvfs; 617fa9e4066Sahrens avl_index_t where; 618fa9e4066Sahrens char from[MAXNAMELEN], to[MAXNAMELEN]; 6193b2aab18SMatthew Ahrens char real[MAXNAMELEN], fsname[MAXNAMELEN]; 620fa9e4066Sahrens int err; 621fa9e4066Sahrens 622ab04eb8eStimh zfsvfs = sdvp->v_vfsp->vfs_data; 623ab04eb8eStimh ZFS_ENTER(zfsvfs); 624ab04eb8eStimh 625ab04eb8eStimh if ((flags & FIGNORECASE) || zfsvfs->z_case == ZFS_CASE_INSENSITIVE) { 626ab04eb8eStimh err = dmu_snapshot_realname(zfsvfs->z_os, snm, real, 627ab04eb8eStimh MAXNAMELEN, NULL); 628ab04eb8eStimh if (err == 0) { 629ab04eb8eStimh snm = real; 630ab04eb8eStimh } else if (err != ENOTSUP) { 631ab04eb8eStimh ZFS_EXIT(zfsvfs); 632ab04eb8eStimh return (err); 633ab04eb8eStimh } 634ab04eb8eStimh } 635ab04eb8eStimh 636ab04eb8eStimh ZFS_EXIT(zfsvfs); 637ecd6cf80Smarks 6383b2aab18SMatthew Ahrens dmu_objset_name(zfsvfs->z_os, fsname); 6393b2aab18SMatthew Ahrens 640ab04eb8eStimh err = zfsctl_snapshot_zname(sdvp, snm, MAXNAMELEN, from); 6413b2aab18SMatthew Ahrens if (err == 0) 642ab04eb8eStimh err = zfsctl_snapshot_zname(tdvp, tnm, MAXNAMELEN, to); 6433b2aab18SMatthew Ahrens if (err == 0) 644ab04eb8eStimh err = zfs_secpolicy_rename_perms(from, to, cr); 6453b2aab18SMatthew Ahrens if (err != 0) 646fa9e4066Sahrens return (err); 647fa9e4066Sahrens 648fa9e4066Sahrens /* 649fa9e4066Sahrens * Cannot move snapshots out of the snapdir. 650fa9e4066Sahrens */ 651fa9e4066Sahrens if (sdvp != tdvp) 652*be6fd75aSMatthew Ahrens return (SET_ERROR(EINVAL)); 653fa9e4066Sahrens 654fa9e4066Sahrens if (strcmp(snm, tnm) == 0) 655fa9e4066Sahrens return (0); 656fa9e4066Sahrens 657fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 658fa9e4066Sahrens 659fa9e4066Sahrens search.se_name = (char *)snm; 6605422900bSmaybee if ((sep = avl_find(&sdp->sd_snaps, &search, &where)) == NULL) { 6615422900bSmaybee mutex_exit(&sdp->sd_lock); 662*be6fd75aSMatthew Ahrens return (SET_ERROR(ENOENT)); 663fa9e4066Sahrens } 664fa9e4066Sahrens 6653b2aab18SMatthew Ahrens err = dsl_dataset_rename_snapshot(fsname, snm, tnm, B_FALSE); 6665422900bSmaybee if (err == 0) 6675422900bSmaybee zfsctl_rename_snap(sdp, sep, tnm); 668fa9e4066Sahrens 669fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 670fa9e4066Sahrens 671fa9e4066Sahrens return (err); 672fa9e4066Sahrens } 673fa9e4066Sahrens 674fa9e4066Sahrens /* ARGSUSED */ 675fa9e4066Sahrens static int 676da6c28aaSamw zfsctl_snapdir_remove(vnode_t *dvp, char *name, vnode_t *cwd, cred_t *cr, 677da6c28aaSamw caller_context_t *ct, int flags) 678fa9e4066Sahrens { 679fa9e4066Sahrens zfsctl_snapdir_t *sdp = dvp->v_data; 6808bf40bf0Sck zfs_snapentry_t *sep; 6818bf40bf0Sck zfs_snapentry_t search; 682ab04eb8eStimh zfsvfs_t *zfsvfs; 683fa9e4066Sahrens char snapname[MAXNAMELEN]; 684ab04eb8eStimh char real[MAXNAMELEN]; 685fa9e4066Sahrens int err; 686fa9e4066Sahrens 687ab04eb8eStimh zfsvfs = dvp->v_vfsp->vfs_data; 688ab04eb8eStimh ZFS_ENTER(zfsvfs); 689ab04eb8eStimh 690ab04eb8eStimh if ((flags & FIGNORECASE) || zfsvfs->z_case == ZFS_CASE_INSENSITIVE) { 691ab04eb8eStimh 692ab04eb8eStimh err = dmu_snapshot_realname(zfsvfs->z_os, name, real, 693ab04eb8eStimh MAXNAMELEN, NULL); 694ab04eb8eStimh if (err == 0) { 695ab04eb8eStimh name = real; 696ab04eb8eStimh } else if (err != ENOTSUP) { 697ab04eb8eStimh ZFS_EXIT(zfsvfs); 698ab04eb8eStimh return (err); 699ab04eb8eStimh } 700ab04eb8eStimh } 701ab04eb8eStimh 702ab04eb8eStimh ZFS_EXIT(zfsvfs); 703ab04eb8eStimh 7045422900bSmaybee err = zfsctl_snapshot_zname(dvp, name, MAXNAMELEN, snapname); 7053b2aab18SMatthew Ahrens if (err == 0) 706ab04eb8eStimh err = zfs_secpolicy_destroy_perms(snapname, cr); 7073b2aab18SMatthew Ahrens if (err != 0) 7085422900bSmaybee return (err); 709ecd6cf80Smarks 710fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 711fa9e4066Sahrens 7128bf40bf0Sck search.se_name = name; 7138bf40bf0Sck sep = avl_find(&sdp->sd_snaps, &search, NULL); 7148bf40bf0Sck if (sep) { 7158bf40bf0Sck avl_remove(&sdp->sd_snaps, sep); 7168bf40bf0Sck err = zfsctl_unmount_snap(sep, MS_FORCE, cr); 7173b2aab18SMatthew Ahrens if (err != 0) 7188bf40bf0Sck avl_add(&sdp->sd_snaps, sep); 7198bf40bf0Sck else 7203b2aab18SMatthew Ahrens err = dsl_destroy_snapshot(snapname, B_FALSE); 7218bf40bf0Sck } else { 722*be6fd75aSMatthew Ahrens err = SET_ERROR(ENOENT); 723fa9e4066Sahrens } 724fa9e4066Sahrens 725fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 726fa9e4066Sahrens 727fa9e4066Sahrens return (err); 728fa9e4066Sahrens } 729fa9e4066Sahrens 730f18faf3fSek /* 731f18faf3fSek * This creates a snapshot under '.zfs/snapshot'. 732f18faf3fSek */ 733ecd6cf80Smarks /* ARGSUSED */ 734ecd6cf80Smarks static int 735ecd6cf80Smarks zfsctl_snapdir_mkdir(vnode_t *dvp, char *dirname, vattr_t *vap, vnode_t **vpp, 736da6c28aaSamw cred_t *cr, caller_context_t *cc, int flags, vsecattr_t *vsecp) 737ecd6cf80Smarks { 738ecd6cf80Smarks zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data; 739ecd6cf80Smarks char name[MAXNAMELEN]; 740ecd6cf80Smarks int err; 741ecd6cf80Smarks static enum symfollow follow = NO_FOLLOW; 742ecd6cf80Smarks static enum uio_seg seg = UIO_SYSSPACE; 743ecd6cf80Smarks 7446d1e0b89Smarks if (snapshot_namecheck(dirname, NULL, NULL) != 0) 745*be6fd75aSMatthew Ahrens return (SET_ERROR(EILSEQ)); 7466d1e0b89Smarks 747ecd6cf80Smarks dmu_objset_name(zfsvfs->z_os, name); 748ecd6cf80Smarks 749ecd6cf80Smarks *vpp = NULL; 750ecd6cf80Smarks 751ecd6cf80Smarks err = zfs_secpolicy_snapshot_perms(name, cr); 7523b2aab18SMatthew Ahrens if (err != 0) 753ecd6cf80Smarks return (err); 754ecd6cf80Smarks 755ecd6cf80Smarks if (err == 0) { 7564445fffbSMatthew Ahrens err = dmu_objset_snapshot_one(name, dirname); 7573b2aab18SMatthew Ahrens if (err != 0) 758ecd6cf80Smarks return (err); 759ecd6cf80Smarks err = lookupnameat(dirname, seg, follow, NULL, vpp, dvp); 760ecd6cf80Smarks } 761ecd6cf80Smarks 762ecd6cf80Smarks return (err); 763ecd6cf80Smarks } 764ecd6cf80Smarks 765fa9e4066Sahrens /* 766fa9e4066Sahrens * Lookup entry point for the 'snapshot' directory. Try to open the 767fa9e4066Sahrens * snapshot if it exist, creating the pseudo filesystem vnode as necessary. 768fa9e4066Sahrens * Perform a mount of the associated dataset on top of the vnode. 769fa9e4066Sahrens */ 770fa9e4066Sahrens /* ARGSUSED */ 771fa9e4066Sahrens static int 772fa9e4066Sahrens zfsctl_snapdir_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, pathname_t *pnp, 773da6c28aaSamw int flags, vnode_t *rdir, cred_t *cr, caller_context_t *ct, 774da6c28aaSamw int *direntflags, pathname_t *realpnp) 775fa9e4066Sahrens { 776fa9e4066Sahrens zfsctl_snapdir_t *sdp = dvp->v_data; 777fa9e4066Sahrens objset_t *snap; 778fa9e4066Sahrens char snapname[MAXNAMELEN]; 779ab04eb8eStimh char real[MAXNAMELEN]; 780fa9e4066Sahrens char *mountpoint; 781fa9e4066Sahrens zfs_snapentry_t *sep, search; 782fa9e4066Sahrens struct mounta margs; 783fa9e4066Sahrens vfs_t *vfsp; 784fa9e4066Sahrens size_t mountpoint_len; 785fa9e4066Sahrens avl_index_t where; 786fa9e4066Sahrens zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data; 787fa9e4066Sahrens int err; 788fa9e4066Sahrens 789da6c28aaSamw /* 790da6c28aaSamw * No extended attributes allowed under .zfs 791da6c28aaSamw */ 792da6c28aaSamw if (flags & LOOKUP_XATTR) 793*be6fd75aSMatthew Ahrens return (SET_ERROR(EINVAL)); 794da6c28aaSamw 795fa9e4066Sahrens ASSERT(dvp->v_type == VDIR); 796fa9e4066Sahrens 797fa9e4066Sahrens /* 798fa9e4066Sahrens * If we get a recursive call, that means we got called 799fa9e4066Sahrens * from the domount() code while it was trying to look up the 800fa9e4066Sahrens * spec (which looks like a local path for zfs). We need to 801fa9e4066Sahrens * add some flag to domount() to tell it not to do this lookup. 802fa9e4066Sahrens */ 803fa9e4066Sahrens if (MUTEX_HELD(&sdp->sd_lock)) 804*be6fd75aSMatthew Ahrens return (SET_ERROR(ENOENT)); 805fa9e4066Sahrens 806fa9e4066Sahrens ZFS_ENTER(zfsvfs); 807fa9e4066Sahrens 808142ae85dSChris Kirby if (gfs_lookup_dot(vpp, dvp, zfsvfs->z_ctldir, nm) == 0) { 809142ae85dSChris Kirby ZFS_EXIT(zfsvfs); 810142ae85dSChris Kirby return (0); 811142ae85dSChris Kirby } 812142ae85dSChris Kirby 813ab04eb8eStimh if (flags & FIGNORECASE) { 814ab04eb8eStimh boolean_t conflict = B_FALSE; 815ab04eb8eStimh 816ab04eb8eStimh err = dmu_snapshot_realname(zfsvfs->z_os, nm, real, 817ab04eb8eStimh MAXNAMELEN, &conflict); 818ab04eb8eStimh if (err == 0) { 819ab04eb8eStimh nm = real; 820ab04eb8eStimh } else if (err != ENOTSUP) { 821ab04eb8eStimh ZFS_EXIT(zfsvfs); 822ab04eb8eStimh return (err); 823ab04eb8eStimh } 824ab04eb8eStimh if (realpnp) 825ab04eb8eStimh (void) strlcpy(realpnp->pn_buf, nm, 826ab04eb8eStimh realpnp->pn_bufsize); 827ab04eb8eStimh if (conflict && direntflags) 828ab04eb8eStimh *direntflags = ED_CASE_CONFLICT; 829ab04eb8eStimh } 830ab04eb8eStimh 831fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 832fa9e4066Sahrens search.se_name = (char *)nm; 833fa9e4066Sahrens if ((sep = avl_find(&sdp->sd_snaps, &search, &where)) != NULL) { 834fa9e4066Sahrens *vpp = sep->se_root; 835fa9e4066Sahrens VN_HOLD(*vpp); 836bbf4a8dfSmaybee err = traverse(vpp); 8373b2aab18SMatthew Ahrens if (err != 0) { 838bbf4a8dfSmaybee VN_RELE(*vpp); 839bbf4a8dfSmaybee *vpp = NULL; 840bbf4a8dfSmaybee } else if (*vpp == sep->se_root) { 841bbf4a8dfSmaybee /* 842bbf4a8dfSmaybee * The snapshot was unmounted behind our backs, 843bbf4a8dfSmaybee * try to remount it. 844bbf4a8dfSmaybee */ 845fa9e4066Sahrens goto domount; 8468bf40bf0Sck } else { 8478bf40bf0Sck /* 8488bf40bf0Sck * VROOT was set during the traverse call. We need 8498bf40bf0Sck * to clear it since we're pretending to be part 8508bf40bf0Sck * of our parent's vfs. 8518bf40bf0Sck */ 8528bf40bf0Sck (*vpp)->v_flag &= ~VROOT; 853bb963f1cSmaybee } 854fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 855fa9e4066Sahrens ZFS_EXIT(zfsvfs); 856bbf4a8dfSmaybee return (err); 857fa9e4066Sahrens } 858fa9e4066Sahrens 859fa9e4066Sahrens /* 860fa9e4066Sahrens * The requested snapshot is not currently mounted, look it up. 861fa9e4066Sahrens */ 8625422900bSmaybee err = zfsctl_snapshot_zname(dvp, nm, MAXNAMELEN, snapname); 8633b2aab18SMatthew Ahrens if (err != 0) { 8645422900bSmaybee mutex_exit(&sdp->sd_lock); 8655422900bSmaybee ZFS_EXIT(zfsvfs); 8662283022cSmarks /* 8672283022cSmarks * handle "ls *" or "?" in a graceful manner, 8682283022cSmarks * forcing EILSEQ to ENOENT. 8692283022cSmarks * Since shell ultimately passes "*" or "?" as name to lookup 8702283022cSmarks */ 8712283022cSmarks return (err == EILSEQ ? ENOENT : err); 8725422900bSmaybee } 873503ad85cSMatthew Ahrens if (dmu_objset_hold(snapname, FTAG, &snap) != 0) { 874fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 875fa9e4066Sahrens ZFS_EXIT(zfsvfs); 876*be6fd75aSMatthew Ahrens return (SET_ERROR(ENOENT)); 877fa9e4066Sahrens } 878fa9e4066Sahrens 879fa9e4066Sahrens sep = kmem_alloc(sizeof (zfs_snapentry_t), KM_SLEEP); 880fa9e4066Sahrens sep->se_name = kmem_alloc(strlen(nm) + 1, KM_SLEEP); 881fa9e4066Sahrens (void) strcpy(sep->se_name, nm); 882fa9e4066Sahrens *vpp = sep->se_root = zfsctl_snapshot_mknode(dvp, dmu_objset_id(snap)); 883fa9e4066Sahrens avl_insert(&sdp->sd_snaps, sep, where); 884fa9e4066Sahrens 885503ad85cSMatthew Ahrens dmu_objset_rele(snap, FTAG); 886fa9e4066Sahrens domount: 887fa9e4066Sahrens mountpoint_len = strlen(refstr_value(dvp->v_vfsp->vfs_mntpt)) + 888fa9e4066Sahrens strlen("/.zfs/snapshot/") + strlen(nm) + 1; 889fa9e4066Sahrens mountpoint = kmem_alloc(mountpoint_len, KM_SLEEP); 890fa9e4066Sahrens (void) snprintf(mountpoint, mountpoint_len, "%s/.zfs/snapshot/%s", 891fa9e4066Sahrens refstr_value(dvp->v_vfsp->vfs_mntpt), nm); 892fa9e4066Sahrens 893fa9e4066Sahrens margs.spec = snapname; 894fa9e4066Sahrens margs.dir = mountpoint; 895fa9e4066Sahrens margs.flags = MS_SYSSPACE | MS_NOMNTTAB; 896fa9e4066Sahrens margs.fstype = "zfs"; 897fa9e4066Sahrens margs.dataptr = NULL; 898fa9e4066Sahrens margs.datalen = 0; 899fa9e4066Sahrens margs.optptr = NULL; 900fa9e4066Sahrens margs.optlen = 0; 901fa9e4066Sahrens 902fa9e4066Sahrens err = domount("zfs", &margs, *vpp, kcred, &vfsp); 903fa9e4066Sahrens kmem_free(mountpoint, mountpoint_len); 904fa9e4066Sahrens 90595c9592aSmaybee if (err == 0) { 90695c9592aSmaybee /* 90795c9592aSmaybee * Return the mounted root rather than the covered mount point. 908f18faf3fSek * Takes the GFS vnode at .zfs/snapshot/<snapname> and returns 909f18faf3fSek * the ZFS vnode mounted on top of the GFS node. This ZFS 910142ae85dSChris Kirby * vnode is the root of the newly created vfsp. 91195c9592aSmaybee */ 91295c9592aSmaybee VFS_RELE(vfsp); 91395c9592aSmaybee err = traverse(vpp); 91495c9592aSmaybee } 915fa9e4066Sahrens 91695c9592aSmaybee if (err == 0) { 91795c9592aSmaybee /* 918f18faf3fSek * Fix up the root vnode mounted on .zfs/snapshot/<snapname>. 919ed097989Sek * 920ed097989Sek * This is where we lie about our v_vfsp in order to 921f18faf3fSek * make .zfs/snapshot/<snapname> accessible over NFS 922f18faf3fSek * without requiring manual mounts of <snapname>. 92395c9592aSmaybee */ 92495c9592aSmaybee ASSERT(VTOZ(*vpp)->z_zfsvfs != zfsvfs); 92595c9592aSmaybee VTOZ(*vpp)->z_zfsvfs->z_parent = zfsvfs; 92695c9592aSmaybee (*vpp)->v_vfsp = zfsvfs->z_vfs; 92795c9592aSmaybee (*vpp)->v_flag &= ~VROOT; 92895c9592aSmaybee } 929fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 930fa9e4066Sahrens ZFS_EXIT(zfsvfs); 931fa9e4066Sahrens 932bb963f1cSmaybee /* 933bb963f1cSmaybee * If we had an error, drop our hold on the vnode and 934bb963f1cSmaybee * zfsctl_snapshot_inactive() will clean up. 935bb963f1cSmaybee */ 9363b2aab18SMatthew Ahrens if (err != 0) { 93795c9592aSmaybee VN_RELE(*vpp); 938bb963f1cSmaybee *vpp = NULL; 939bb963f1cSmaybee } 94095c9592aSmaybee return (err); 941fa9e4066Sahrens } 942fa9e4066Sahrens 943743a77edSAlan Wright /* ARGSUSED */ 944743a77edSAlan Wright static int 945743a77edSAlan Wright zfsctl_shares_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, pathname_t *pnp, 946743a77edSAlan Wright int flags, vnode_t *rdir, cred_t *cr, caller_context_t *ct, 947743a77edSAlan Wright int *direntflags, pathname_t *realpnp) 948743a77edSAlan Wright { 949743a77edSAlan Wright zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data; 950743a77edSAlan Wright znode_t *dzp; 951743a77edSAlan Wright int error; 952743a77edSAlan Wright 953743a77edSAlan Wright ZFS_ENTER(zfsvfs); 954743a77edSAlan Wright 955743a77edSAlan Wright if (gfs_lookup_dot(vpp, dvp, zfsvfs->z_ctldir, nm) == 0) { 956743a77edSAlan Wright ZFS_EXIT(zfsvfs); 957743a77edSAlan Wright return (0); 958743a77edSAlan Wright } 959743a77edSAlan Wright 9609e1320c0SMark Shellenbaum if (zfsvfs->z_shares_dir == 0) { 9619e1320c0SMark Shellenbaum ZFS_EXIT(zfsvfs); 962*be6fd75aSMatthew Ahrens return (SET_ERROR(ENOTSUP)); 9639e1320c0SMark Shellenbaum } 964743a77edSAlan Wright if ((error = zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp)) == 0) 965743a77edSAlan Wright error = VOP_LOOKUP(ZTOV(dzp), nm, vpp, pnp, 966743a77edSAlan Wright flags, rdir, cr, ct, direntflags, realpnp); 967743a77edSAlan Wright 968743a77edSAlan Wright VN_RELE(ZTOV(dzp)); 969743a77edSAlan Wright ZFS_EXIT(zfsvfs); 970743a77edSAlan Wright 971743a77edSAlan Wright return (error); 972743a77edSAlan Wright } 973743a77edSAlan Wright 974fa9e4066Sahrens /* ARGSUSED */ 975fa9e4066Sahrens static int 976b38f0970Sck zfsctl_snapdir_readdir_cb(vnode_t *vp, void *dp, int *eofp, 977b38f0970Sck offset_t *offp, offset_t *nextp, void *data, int flags) 978fa9e4066Sahrens { 979fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 980fa9e4066Sahrens char snapname[MAXNAMELEN]; 981fa9e4066Sahrens uint64_t id, cookie; 982b38f0970Sck boolean_t case_conflict; 983b38f0970Sck int error; 984fa9e4066Sahrens 985fa9e4066Sahrens ZFS_ENTER(zfsvfs); 986fa9e4066Sahrens 987fa9e4066Sahrens cookie = *offp; 9883b2aab18SMatthew Ahrens dsl_pool_config_enter(dmu_objset_pool(zfsvfs->z_os), FTAG); 989b38f0970Sck error = dmu_snapshot_list_next(zfsvfs->z_os, MAXNAMELEN, snapname, &id, 990b38f0970Sck &cookie, &case_conflict); 9913b2aab18SMatthew Ahrens dsl_pool_config_exit(dmu_objset_pool(zfsvfs->z_os), FTAG); 992b38f0970Sck if (error) { 993fa9e4066Sahrens ZFS_EXIT(zfsvfs); 994b38f0970Sck if (error == ENOENT) { 995b38f0970Sck *eofp = 1; 996b38f0970Sck return (0); 997b38f0970Sck } 998b38f0970Sck return (error); 999fa9e4066Sahrens } 1000fa9e4066Sahrens 1001b38f0970Sck if (flags & V_RDDIR_ENTFLAGS) { 1002b38f0970Sck edirent_t *eodp = dp; 1003b38f0970Sck 1004b38f0970Sck (void) strcpy(eodp->ed_name, snapname); 1005b38f0970Sck eodp->ed_ino = ZFSCTL_INO_SNAP(id); 1006b38f0970Sck eodp->ed_eflags = case_conflict ? ED_CASE_CONFLICT : 0; 1007b38f0970Sck } else { 1008b38f0970Sck struct dirent64 *odp = dp; 1009b38f0970Sck 1010b38f0970Sck (void) strcpy(odp->d_name, snapname); 1011b38f0970Sck odp->d_ino = ZFSCTL_INO_SNAP(id); 1012b38f0970Sck } 1013fa9e4066Sahrens *nextp = cookie; 1014fa9e4066Sahrens 1015fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1016fa9e4066Sahrens 1017fa9e4066Sahrens return (0); 1018fa9e4066Sahrens } 1019fa9e4066Sahrens 1020743a77edSAlan Wright /* ARGSUSED */ 1021743a77edSAlan Wright static int 1022743a77edSAlan Wright zfsctl_shares_readdir(vnode_t *vp, uio_t *uiop, cred_t *cr, int *eofp, 1023743a77edSAlan Wright caller_context_t *ct, int flags) 1024743a77edSAlan Wright { 1025743a77edSAlan Wright zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 1026743a77edSAlan Wright znode_t *dzp; 1027743a77edSAlan Wright int error; 1028743a77edSAlan Wright 1029743a77edSAlan Wright ZFS_ENTER(zfsvfs); 1030743a77edSAlan Wright 10319e1320c0SMark Shellenbaum if (zfsvfs->z_shares_dir == 0) { 10329e1320c0SMark Shellenbaum ZFS_EXIT(zfsvfs); 1033*be6fd75aSMatthew Ahrens return (SET_ERROR(ENOTSUP)); 10349e1320c0SMark Shellenbaum } 1035743a77edSAlan Wright if ((error = zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp)) == 0) { 1036743a77edSAlan Wright error = VOP_READDIR(ZTOV(dzp), uiop, cr, eofp, ct, flags); 1037743a77edSAlan Wright VN_RELE(ZTOV(dzp)); 1038743a77edSAlan Wright } else { 1039743a77edSAlan Wright *eofp = 1; 1040*be6fd75aSMatthew Ahrens error = SET_ERROR(ENOENT); 1041743a77edSAlan Wright } 1042743a77edSAlan Wright 1043743a77edSAlan Wright ZFS_EXIT(zfsvfs); 1044743a77edSAlan Wright return (error); 1045743a77edSAlan Wright } 1046743a77edSAlan Wright 1047f18faf3fSek /* 1048f18faf3fSek * pvp is the '.zfs' directory (zfsctl_node_t). 1049f18faf3fSek * Creates vp, which is '.zfs/snapshot' (zfsctl_snapdir_t). 1050f18faf3fSek * 1051f18faf3fSek * This function is the callback to create a GFS vnode for '.zfs/snapshot' 1052f18faf3fSek * when a lookup is performed on .zfs for "snapshot". 1053f18faf3fSek */ 1054fa9e4066Sahrens vnode_t * 1055fa9e4066Sahrens zfsctl_mknode_snapdir(vnode_t *pvp) 1056fa9e4066Sahrens { 1057fa9e4066Sahrens vnode_t *vp; 1058fa9e4066Sahrens zfsctl_snapdir_t *sdp; 1059fa9e4066Sahrens 1060fa9e4066Sahrens vp = gfs_dir_create(sizeof (zfsctl_snapdir_t), pvp, 1061fa9e4066Sahrens zfsctl_ops_snapdir, NULL, NULL, MAXNAMELEN, 1062fa9e4066Sahrens zfsctl_snapdir_readdir_cb, NULL); 1063fa9e4066Sahrens sdp = vp->v_data; 1064fa9e4066Sahrens sdp->sd_node.zc_id = ZFSCTL_INO_SNAPDIR; 1065a32fded1Sek sdp->sd_node.zc_cmtime = ((zfsctl_node_t *)pvp->v_data)->zc_cmtime; 1066fa9e4066Sahrens mutex_init(&sdp->sd_lock, NULL, MUTEX_DEFAULT, NULL); 1067fa9e4066Sahrens avl_create(&sdp->sd_snaps, snapentry_compare, 1068fa9e4066Sahrens sizeof (zfs_snapentry_t), offsetof(zfs_snapentry_t, se_node)); 1069fa9e4066Sahrens return (vp); 1070fa9e4066Sahrens } 1071fa9e4066Sahrens 1072743a77edSAlan Wright vnode_t * 1073743a77edSAlan Wright zfsctl_mknode_shares(vnode_t *pvp) 1074743a77edSAlan Wright { 1075743a77edSAlan Wright vnode_t *vp; 1076743a77edSAlan Wright zfsctl_node_t *sdp; 1077743a77edSAlan Wright 1078743a77edSAlan Wright vp = gfs_dir_create(sizeof (zfsctl_node_t), pvp, 1079743a77edSAlan Wright zfsctl_ops_shares, NULL, NULL, MAXNAMELEN, 1080743a77edSAlan Wright NULL, NULL); 1081743a77edSAlan Wright sdp = vp->v_data; 1082743a77edSAlan Wright sdp->zc_cmtime = ((zfsctl_node_t *)pvp->v_data)->zc_cmtime; 1083743a77edSAlan Wright return (vp); 1084743a77edSAlan Wright 1085743a77edSAlan Wright } 1086743a77edSAlan Wright 1087743a77edSAlan Wright /* ARGSUSED */ 1088743a77edSAlan Wright static int 1089743a77edSAlan Wright zfsctl_shares_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr, 1090743a77edSAlan Wright caller_context_t *ct) 1091743a77edSAlan Wright { 1092743a77edSAlan Wright zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 1093743a77edSAlan Wright znode_t *dzp; 1094743a77edSAlan Wright int error; 1095743a77edSAlan Wright 1096743a77edSAlan Wright ZFS_ENTER(zfsvfs); 10979e1320c0SMark Shellenbaum if (zfsvfs->z_shares_dir == 0) { 10989e1320c0SMark Shellenbaum ZFS_EXIT(zfsvfs); 1099*be6fd75aSMatthew Ahrens return (SET_ERROR(ENOTSUP)); 11009e1320c0SMark Shellenbaum } 1101743a77edSAlan Wright if ((error = zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp)) == 0) { 1102743a77edSAlan Wright error = VOP_GETATTR(ZTOV(dzp), vap, flags, cr, ct); 1103743a77edSAlan Wright VN_RELE(ZTOV(dzp)); 1104743a77edSAlan Wright } 1105743a77edSAlan Wright ZFS_EXIT(zfsvfs); 1106743a77edSAlan Wright return (error); 1107743a77edSAlan Wright 1108743a77edSAlan Wright 1109743a77edSAlan Wright } 1110743a77edSAlan Wright 1111fa9e4066Sahrens /* ARGSUSED */ 1112fa9e4066Sahrens static int 1113da6c28aaSamw zfsctl_snapdir_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr, 1114da6c28aaSamw caller_context_t *ct) 1115fa9e4066Sahrens { 1116fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 1117fa9e4066Sahrens zfsctl_snapdir_t *sdp = vp->v_data; 1118fa9e4066Sahrens 1119fa9e4066Sahrens ZFS_ENTER(zfsvfs); 1120fa9e4066Sahrens zfsctl_common_getattr(vp, vap); 1121fa9e4066Sahrens vap->va_nodeid = gfs_file_inode(vp); 1122fa9e4066Sahrens vap->va_nlink = vap->va_size = avl_numnodes(&sdp->sd_snaps) + 2; 112371eb0538SChris Kirby vap->va_ctime = vap->va_mtime = dmu_objset_snap_cmtime(zfsvfs->z_os); 1124fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1125fa9e4066Sahrens 1126fa9e4066Sahrens return (0); 1127fa9e4066Sahrens } 1128fa9e4066Sahrens 1129bb963f1cSmaybee /* ARGSUSED */ 1130fa9e4066Sahrens static void 1131da6c28aaSamw zfsctl_snapdir_inactive(vnode_t *vp, cred_t *cr, caller_context_t *ct) 1132fa9e4066Sahrens { 1133fa9e4066Sahrens zfsctl_snapdir_t *sdp = vp->v_data; 1134bb963f1cSmaybee void *private; 1135bb963f1cSmaybee 1136bb963f1cSmaybee private = gfs_dir_inactive(vp); 1137bb963f1cSmaybee if (private != NULL) { 1138bb963f1cSmaybee ASSERT(avl_numnodes(&sdp->sd_snaps) == 0); 1139bb963f1cSmaybee mutex_destroy(&sdp->sd_lock); 1140bb963f1cSmaybee avl_destroy(&sdp->sd_snaps); 1141bb963f1cSmaybee kmem_free(private, sizeof (zfsctl_snapdir_t)); 1142bb963f1cSmaybee } 1143fa9e4066Sahrens } 1144fa9e4066Sahrens 1145fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapdir[] = { 1146aa59c4cbSrsb { VOPNAME_OPEN, { .vop_open = zfsctl_common_open } }, 1147aa59c4cbSrsb { VOPNAME_CLOSE, { .vop_close = zfsctl_common_close } }, 1148aa59c4cbSrsb { VOPNAME_IOCTL, { .error = fs_inval } }, 1149aa59c4cbSrsb { VOPNAME_GETATTR, { .vop_getattr = zfsctl_snapdir_getattr } }, 1150aa59c4cbSrsb { VOPNAME_ACCESS, { .vop_access = zfsctl_common_access } }, 1151aa59c4cbSrsb { VOPNAME_RENAME, { .vop_rename = zfsctl_snapdir_rename } }, 1152aa59c4cbSrsb { VOPNAME_RMDIR, { .vop_rmdir = zfsctl_snapdir_remove } }, 1153ecd6cf80Smarks { VOPNAME_MKDIR, { .vop_mkdir = zfsctl_snapdir_mkdir } }, 1154aa59c4cbSrsb { VOPNAME_READDIR, { .vop_readdir = gfs_vop_readdir } }, 1155aa59c4cbSrsb { VOPNAME_LOOKUP, { .vop_lookup = zfsctl_snapdir_lookup } }, 1156aa59c4cbSrsb { VOPNAME_SEEK, { .vop_seek = fs_seek } }, 1157aa59c4cbSrsb { VOPNAME_INACTIVE, { .vop_inactive = zfsctl_snapdir_inactive } }, 1158aa59c4cbSrsb { VOPNAME_FID, { .vop_fid = zfsctl_common_fid } }, 1159fa9e4066Sahrens { NULL } 1160fa9e4066Sahrens }; 1161fa9e4066Sahrens 1162743a77edSAlan Wright static const fs_operation_def_t zfsctl_tops_shares[] = { 1163743a77edSAlan Wright { VOPNAME_OPEN, { .vop_open = zfsctl_common_open } }, 1164743a77edSAlan Wright { VOPNAME_CLOSE, { .vop_close = zfsctl_common_close } }, 1165743a77edSAlan Wright { VOPNAME_IOCTL, { .error = fs_inval } }, 1166743a77edSAlan Wright { VOPNAME_GETATTR, { .vop_getattr = zfsctl_shares_getattr } }, 1167743a77edSAlan Wright { VOPNAME_ACCESS, { .vop_access = zfsctl_common_access } }, 1168743a77edSAlan Wright { VOPNAME_READDIR, { .vop_readdir = zfsctl_shares_readdir } }, 1169743a77edSAlan Wright { VOPNAME_LOOKUP, { .vop_lookup = zfsctl_shares_lookup } }, 1170743a77edSAlan Wright { VOPNAME_SEEK, { .vop_seek = fs_seek } }, 1171743a77edSAlan Wright { VOPNAME_INACTIVE, { .vop_inactive = gfs_vop_inactive } }, 1172743a77edSAlan Wright { VOPNAME_FID, { .vop_fid = zfsctl_shares_fid } }, 1173743a77edSAlan Wright { NULL } 1174743a77edSAlan Wright }; 1175743a77edSAlan Wright 1176f18faf3fSek /* 1177f18faf3fSek * pvp is the GFS vnode '.zfs/snapshot'. 1178f18faf3fSek * 1179f18faf3fSek * This creates a GFS node under '.zfs/snapshot' representing each 1180f18faf3fSek * snapshot. This newly created GFS node is what we mount snapshot 1181f18faf3fSek * vfs_t's ontop of. 1182f18faf3fSek */ 1183fa9e4066Sahrens static vnode_t * 1184fa9e4066Sahrens zfsctl_snapshot_mknode(vnode_t *pvp, uint64_t objset) 1185fa9e4066Sahrens { 1186fa9e4066Sahrens vnode_t *vp; 1187fa9e4066Sahrens zfsctl_node_t *zcp; 1188fa9e4066Sahrens 1189fa9e4066Sahrens vp = gfs_dir_create(sizeof (zfsctl_node_t), pvp, 1190fa9e4066Sahrens zfsctl_ops_snapshot, NULL, NULL, MAXNAMELEN, NULL, NULL); 1191fa9e4066Sahrens zcp = vp->v_data; 1192fa9e4066Sahrens zcp->zc_id = objset; 1193fa9e4066Sahrens 1194fa9e4066Sahrens return (vp); 1195fa9e4066Sahrens } 1196fa9e4066Sahrens 1197fa9e4066Sahrens static void 1198da6c28aaSamw zfsctl_snapshot_inactive(vnode_t *vp, cred_t *cr, caller_context_t *ct) 1199fa9e4066Sahrens { 1200fa9e4066Sahrens zfsctl_snapdir_t *sdp; 1201fa9e4066Sahrens zfs_snapentry_t *sep, *next; 1202fa9e4066Sahrens vnode_t *dvp; 1203fa9e4066Sahrens 1204ab04eb8eStimh VERIFY(gfs_dir_lookup(vp, "..", &dvp, cr, 0, NULL, NULL) == 0); 1205fa9e4066Sahrens sdp = dvp->v_data; 1206fa9e4066Sahrens 1207fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 1208fa9e4066Sahrens 1209fa9e4066Sahrens if (vp->v_count > 1) { 1210fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 1211fa9e4066Sahrens return; 1212fa9e4066Sahrens } 1213fa9e4066Sahrens ASSERT(!vn_ismntpt(vp)); 1214fa9e4066Sahrens 1215fa9e4066Sahrens sep = avl_first(&sdp->sd_snaps); 1216fa9e4066Sahrens while (sep != NULL) { 1217fa9e4066Sahrens next = AVL_NEXT(&sdp->sd_snaps, sep); 1218fa9e4066Sahrens 1219fa9e4066Sahrens if (sep->se_root == vp) { 1220fa9e4066Sahrens avl_remove(&sdp->sd_snaps, sep); 1221fa9e4066Sahrens kmem_free(sep->se_name, strlen(sep->se_name) + 1); 1222fa9e4066Sahrens kmem_free(sep, sizeof (zfs_snapentry_t)); 1223fa9e4066Sahrens break; 1224fa9e4066Sahrens } 1225fa9e4066Sahrens sep = next; 1226fa9e4066Sahrens } 1227fa9e4066Sahrens ASSERT(sep != NULL); 1228fa9e4066Sahrens 1229fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 1230fa9e4066Sahrens VN_RELE(dvp); 1231fa9e4066Sahrens 1232bb963f1cSmaybee /* 1233bb963f1cSmaybee * Dispose of the vnode for the snapshot mount point. 1234bb963f1cSmaybee * This is safe to do because once this entry has been removed 1235bb963f1cSmaybee * from the AVL tree, it can't be found again, so cannot become 1236bb963f1cSmaybee * "active". If we lookup the same name again we will end up 1237bb963f1cSmaybee * creating a new vnode. 1238bb963f1cSmaybee */ 1239da6c28aaSamw gfs_vop_inactive(vp, cr, ct); 1240fa9e4066Sahrens } 1241fa9e4066Sahrens 1242fa9e4066Sahrens 1243fa9e4066Sahrens /* 1244fa9e4066Sahrens * These VP's should never see the light of day. They should always 1245fa9e4066Sahrens * be covered. 1246fa9e4066Sahrens */ 1247fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapshot[] = { 1248aa59c4cbSrsb VOPNAME_INACTIVE, { .vop_inactive = zfsctl_snapshot_inactive }, 1249fa9e4066Sahrens NULL, NULL 1250fa9e4066Sahrens }; 1251fa9e4066Sahrens 1252fa9e4066Sahrens int 1253fa9e4066Sahrens zfsctl_lookup_objset(vfs_t *vfsp, uint64_t objsetid, zfsvfs_t **zfsvfsp) 1254fa9e4066Sahrens { 1255fa9e4066Sahrens zfsvfs_t *zfsvfs = vfsp->vfs_data; 1256fa9e4066Sahrens vnode_t *dvp, *vp; 1257fa9e4066Sahrens zfsctl_snapdir_t *sdp; 1258fa9e4066Sahrens zfsctl_node_t *zcp; 1259fa9e4066Sahrens zfs_snapentry_t *sep; 1260fa9e4066Sahrens int error; 1261fa9e4066Sahrens 1262fa9e4066Sahrens ASSERT(zfsvfs->z_ctldir != NULL); 1263fa9e4066Sahrens error = zfsctl_root_lookup(zfsvfs->z_ctldir, "snapshot", &dvp, 1264da6c28aaSamw NULL, 0, NULL, kcred, NULL, NULL, NULL); 1265fa9e4066Sahrens if (error != 0) 1266fa9e4066Sahrens return (error); 1267fa9e4066Sahrens sdp = dvp->v_data; 1268fa9e4066Sahrens 1269fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 1270fa9e4066Sahrens sep = avl_first(&sdp->sd_snaps); 1271fa9e4066Sahrens while (sep != NULL) { 1272fa9e4066Sahrens vp = sep->se_root; 1273fa9e4066Sahrens zcp = vp->v_data; 1274fa9e4066Sahrens if (zcp->zc_id == objsetid) 1275fa9e4066Sahrens break; 1276fa9e4066Sahrens 1277fa9e4066Sahrens sep = AVL_NEXT(&sdp->sd_snaps, sep); 1278fa9e4066Sahrens } 1279fa9e4066Sahrens 1280fa9e4066Sahrens if (sep != NULL) { 1281fa9e4066Sahrens VN_HOLD(vp); 1282f18faf3fSek /* 1283f18faf3fSek * Return the mounted root rather than the covered mount point. 1284f18faf3fSek * Takes the GFS vnode at .zfs/snapshot/<snapshot objsetid> 1285f18faf3fSek * and returns the ZFS vnode mounted on top of the GFS node. 1286f18faf3fSek * This ZFS vnode is the root of the vfs for objset 'objsetid'. 1287f18faf3fSek */ 1288fa9e4066Sahrens error = traverse(&vp); 1289bbf4a8dfSmaybee if (error == 0) { 1290bbf4a8dfSmaybee if (vp == sep->se_root) 1291*be6fd75aSMatthew Ahrens error = SET_ERROR(EINVAL); 1292bbf4a8dfSmaybee else 1293bbf4a8dfSmaybee *zfsvfsp = VTOZ(vp)->z_zfsvfs; 1294bbf4a8dfSmaybee } 1295fea70b54Snd mutex_exit(&sdp->sd_lock); 1296fa9e4066Sahrens VN_RELE(vp); 1297fa9e4066Sahrens } else { 1298*be6fd75aSMatthew Ahrens error = SET_ERROR(EINVAL); 1299fea70b54Snd mutex_exit(&sdp->sd_lock); 1300fa9e4066Sahrens } 1301fa9e4066Sahrens 1302fa9e4066Sahrens VN_RELE(dvp); 1303fa9e4066Sahrens 1304fa9e4066Sahrens return (error); 1305fa9e4066Sahrens } 1306fa9e4066Sahrens 1307fa9e4066Sahrens /* 1308fa9e4066Sahrens * Unmount any snapshots for the given filesystem. This is called from 1309fa9e4066Sahrens * zfs_umount() - if we have a ctldir, then go through and unmount all the 1310fa9e4066Sahrens * snapshots. 1311fa9e4066Sahrens */ 1312fa9e4066Sahrens int 1313fa9e4066Sahrens zfsctl_umount_snapshots(vfs_t *vfsp, int fflags, cred_t *cr) 1314fa9e4066Sahrens { 1315fa9e4066Sahrens zfsvfs_t *zfsvfs = vfsp->vfs_data; 13168bf40bf0Sck vnode_t *dvp; 1317fa9e4066Sahrens zfsctl_snapdir_t *sdp; 1318fa9e4066Sahrens zfs_snapentry_t *sep, *next; 1319fa9e4066Sahrens int error; 1320fa9e4066Sahrens 1321fa9e4066Sahrens ASSERT(zfsvfs->z_ctldir != NULL); 1322fa9e4066Sahrens error = zfsctl_root_lookup(zfsvfs->z_ctldir, "snapshot", &dvp, 1323da6c28aaSamw NULL, 0, NULL, cr, NULL, NULL, NULL); 1324fa9e4066Sahrens if (error != 0) 1325fa9e4066Sahrens return (error); 1326fa9e4066Sahrens sdp = dvp->v_data; 1327fa9e4066Sahrens 1328fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 1329fa9e4066Sahrens 1330fa9e4066Sahrens sep = avl_first(&sdp->sd_snaps); 1331fa9e4066Sahrens while (sep != NULL) { 1332fa9e4066Sahrens next = AVL_NEXT(&sdp->sd_snaps, sep); 1333fa9e4066Sahrens 1334fa9e4066Sahrens /* 1335fa9e4066Sahrens * If this snapshot is not mounted, then it must 1336fa9e4066Sahrens * have just been unmounted by somebody else, and 1337fa9e4066Sahrens * will be cleaned up by zfsctl_snapdir_inactive(). 1338fa9e4066Sahrens */ 13398bf40bf0Sck if (vn_ismntpt(sep->se_root)) { 13408bf40bf0Sck avl_remove(&sdp->sd_snaps, sep); 13418bf40bf0Sck error = zfsctl_unmount_snap(sep, fflags, cr); 1342fa9e4066Sahrens if (error) { 13438bf40bf0Sck avl_add(&sdp->sd_snaps, sep); 13448bf40bf0Sck break; 1345fa9e4066Sahrens } 1346fa9e4066Sahrens } 1347fa9e4066Sahrens sep = next; 1348fa9e4066Sahrens } 13498bf40bf0Sck 1350fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 1351fa9e4066Sahrens VN_RELE(dvp); 1352fa9e4066Sahrens 1353fa9e4066Sahrens return (error); 1354fa9e4066Sahrens } 1355