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 /* 22aa59c4cbSrsb * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23fa9e4066Sahrens * Use is subject to license terms. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens #pragma ident "%Z%%M% %I% %E% SMI" 27fa9e4066Sahrens 28fa9e4066Sahrens /* 29fa9e4066Sahrens * ZFS control directory (a.k.a. ".zfs") 30fa9e4066Sahrens * 31fa9e4066Sahrens * This directory provides a common location for all ZFS meta-objects. 32fa9e4066Sahrens * Currently, this is only the 'snapshot' directory, but this may expand in the 33fa9e4066Sahrens * future. The elements are built using the GFS primitives, as the hierarchy 34fa9e4066Sahrens * does not actually exist on disk. 35fa9e4066Sahrens * 36fa9e4066Sahrens * For 'snapshot', we don't want to have all snapshots always mounted, because 37fa9e4066Sahrens * this would take up a huge amount of space in /etc/mnttab. We have three 38fa9e4066Sahrens * types of objects: 39fa9e4066Sahrens * 40fa9e4066Sahrens * ctldir ------> snapshotdir -------> snapshot 41fa9e4066Sahrens * | 42fa9e4066Sahrens * | 43fa9e4066Sahrens * V 44fa9e4066Sahrens * mounted fs 45fa9e4066Sahrens * 46fa9e4066Sahrens * The 'snapshot' node contains just enough information to lookup '..' and act 47fa9e4066Sahrens * as a mountpoint for the snapshot. Whenever we lookup a specific snapshot, we 48fa9e4066Sahrens * perform an automount of the underlying filesystem and return the 49fa9e4066Sahrens * corresponding vnode. 50fa9e4066Sahrens * 51fa9e4066Sahrens * All mounts are handled automatically by the kernel, but unmounts are 52fa9e4066Sahrens * (currently) handled from user land. The main reason is that there is no 53fa9e4066Sahrens * reliable way to auto-unmount the filesystem when it's "no longer in use". 54fa9e4066Sahrens * When the user unmounts a filesystem, we call zfsctl_unmount(), which 55fa9e4066Sahrens * unmounts any snapshots within the snapshot directory. 56*f18faf3fSek * 57*f18faf3fSek * The '.zfs', '.zfs/snapshot', and all directories created under 58*f18faf3fSek * '.zfs/snapshot' (ie: '.zfs/snapshot/<snapname>') are all GFS nodes and 59*f18faf3fSek * share the same vfs_t as the head filesystem (what '.zfs' lives under). 60*f18faf3fSek * 61*f18faf3fSek * File systems mounted ontop of the GFS nodes '.zfs/snapshot/<snapname>' 62*f18faf3fSek * (ie: snapshots) are ZFS nodes and have their own unique vfs_t. 63*f18faf3fSek * However, vnodes within these mounted on file systems have their v_vfsp 64*f18faf3fSek * fields set to the head filesystem to make NFS happy (see 65*f18faf3fSek * zfsctl_snapdir_lookup()). 66fa9e4066Sahrens */ 67fa9e4066Sahrens 68fa9e4066Sahrens #include <fs/fs_subr.h> 69fa9e4066Sahrens #include <sys/zfs_ctldir.h> 70fa9e4066Sahrens #include <sys/zfs_ioctl.h> 71fa9e4066Sahrens #include <sys/zfs_vfsops.h> 72aa59c4cbSrsb #include <sys/vfs_opreg.h> 73fa9e4066Sahrens #include <sys/gfs.h> 74fa9e4066Sahrens #include <sys/stat.h> 75fa9e4066Sahrens #include <sys/dmu.h> 76ecd6cf80Smarks #include <sys/dsl_deleg.h> 77fa9e4066Sahrens #include <sys/mount.h> 78fa9e4066Sahrens 79fa9e4066Sahrens typedef struct { 80fa9e4066Sahrens char *se_name; 81fa9e4066Sahrens vnode_t *se_root; 82fa9e4066Sahrens avl_node_t se_node; 83fa9e4066Sahrens } zfs_snapentry_t; 84fa9e4066Sahrens 85fa9e4066Sahrens static int 86fa9e4066Sahrens snapentry_compare(const void *a, const void *b) 87fa9e4066Sahrens { 88fa9e4066Sahrens const zfs_snapentry_t *sa = a; 89fa9e4066Sahrens const zfs_snapentry_t *sb = b; 90fa9e4066Sahrens int ret = strcmp(sa->se_name, sb->se_name); 91fa9e4066Sahrens 92fa9e4066Sahrens if (ret < 0) 93fa9e4066Sahrens return (-1); 94fa9e4066Sahrens else if (ret > 0) 95fa9e4066Sahrens return (1); 96fa9e4066Sahrens else 97fa9e4066Sahrens return (0); 98fa9e4066Sahrens } 99fa9e4066Sahrens 100fa9e4066Sahrens vnodeops_t *zfsctl_ops_root; 101fa9e4066Sahrens vnodeops_t *zfsctl_ops_snapdir; 102fa9e4066Sahrens vnodeops_t *zfsctl_ops_snapshot; 103fa9e4066Sahrens 104fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_root[]; 105fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapdir[]; 106fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapshot[]; 107fa9e4066Sahrens 108fa9e4066Sahrens static vnode_t *zfsctl_mknode_snapdir(vnode_t *); 109fa9e4066Sahrens static vnode_t *zfsctl_snapshot_mknode(vnode_t *, uint64_t objset); 110fa9e4066Sahrens 111fa9e4066Sahrens static gfs_opsvec_t zfsctl_opsvec[] = { 112fa9e4066Sahrens { ".zfs", zfsctl_tops_root, &zfsctl_ops_root }, 113fa9e4066Sahrens { ".zfs/snapshot", zfsctl_tops_snapdir, &zfsctl_ops_snapdir }, 114fa9e4066Sahrens { ".zfs/snapshot/vnode", zfsctl_tops_snapshot, &zfsctl_ops_snapshot }, 115fa9e4066Sahrens { NULL } 116fa9e4066Sahrens }; 117fa9e4066Sahrens 118fa9e4066Sahrens typedef struct zfsctl_node { 119fa9e4066Sahrens gfs_dir_t zc_gfs_private; 120fa9e4066Sahrens uint64_t zc_id; 121a32fded1Sek timestruc_t zc_cmtime; /* ctime and mtime, always the same */ 122fa9e4066Sahrens } zfsctl_node_t; 123fa9e4066Sahrens 124fa9e4066Sahrens typedef struct zfsctl_snapdir { 125fa9e4066Sahrens zfsctl_node_t sd_node; 126fa9e4066Sahrens kmutex_t sd_lock; 127fa9e4066Sahrens avl_tree_t sd_snaps; 128fa9e4066Sahrens } zfsctl_snapdir_t; 129fa9e4066Sahrens 130fa9e4066Sahrens /* 131fa9e4066Sahrens * Root directory elements. We have only a single static entry, 'snapshot'. 132fa9e4066Sahrens */ 133fa9e4066Sahrens static gfs_dirent_t zfsctl_root_entries[] = { 134fa9e4066Sahrens { "snapshot", zfsctl_mknode_snapdir, GFS_CACHE_VNODE }, 135fa9e4066Sahrens { NULL } 136fa9e4066Sahrens }; 137fa9e4066Sahrens 138fa9e4066Sahrens /* include . and .. in the calculation */ 139fa9e4066Sahrens #define NROOT_ENTRIES ((sizeof (zfsctl_root_entries) / \ 140fa9e4066Sahrens sizeof (gfs_dirent_t)) + 1) 141fa9e4066Sahrens 142fa9e4066Sahrens 143fa9e4066Sahrens /* 144fa9e4066Sahrens * Initialize the various GFS pieces we'll need to create and manipulate .zfs 145fa9e4066Sahrens * directories. This is called from the ZFS init routine, and initializes the 146fa9e4066Sahrens * vnode ops vectors that we'll be using. 147fa9e4066Sahrens */ 148fa9e4066Sahrens void 149fa9e4066Sahrens zfsctl_init(void) 150fa9e4066Sahrens { 151fa9e4066Sahrens VERIFY(gfs_make_opsvec(zfsctl_opsvec) == 0); 152fa9e4066Sahrens } 153fa9e4066Sahrens 154fa9e4066Sahrens void 155fa9e4066Sahrens zfsctl_fini(void) 156fa9e4066Sahrens { 157fa9e4066Sahrens /* 158fa9e4066Sahrens * Remove vfsctl vnode ops 159fa9e4066Sahrens */ 160fa9e4066Sahrens if (zfsctl_ops_root) 161fa9e4066Sahrens vn_freevnodeops(zfsctl_ops_root); 162fa9e4066Sahrens if (zfsctl_ops_snapdir) 163fa9e4066Sahrens vn_freevnodeops(zfsctl_ops_snapdir); 164fa9e4066Sahrens if (zfsctl_ops_snapshot) 165fa9e4066Sahrens vn_freevnodeops(zfsctl_ops_snapshot); 166fa9e4066Sahrens 167fa9e4066Sahrens zfsctl_ops_root = NULL; 168fa9e4066Sahrens zfsctl_ops_snapdir = NULL; 169fa9e4066Sahrens zfsctl_ops_snapshot = NULL; 170fa9e4066Sahrens } 171fa9e4066Sahrens 172fa9e4066Sahrens /* 173fa9e4066Sahrens * Return the inode number associated with the 'snapshot' directory. 174fa9e4066Sahrens */ 175fa9e4066Sahrens /* ARGSUSED */ 176fa9e4066Sahrens static ino64_t 177fa9e4066Sahrens zfsctl_root_inode_cb(vnode_t *vp, int index) 178fa9e4066Sahrens { 179fa9e4066Sahrens ASSERT(index == 0); 180fa9e4066Sahrens return (ZFSCTL_INO_SNAPDIR); 181fa9e4066Sahrens } 182fa9e4066Sahrens 183fa9e4066Sahrens /* 184fa9e4066Sahrens * Create the '.zfs' directory. This directory is cached as part of the VFS 185fa9e4066Sahrens * structure. This results in a hold on the vfs_t. The code in zfs_umount() 186fa9e4066Sahrens * therefore checks against a vfs_count of 2 instead of 1. This reference 187fa9e4066Sahrens * is removed when the ctldir is destroyed in the unmount. 188fa9e4066Sahrens */ 189fa9e4066Sahrens void 190fa9e4066Sahrens zfsctl_create(zfsvfs_t *zfsvfs) 191fa9e4066Sahrens { 192a32fded1Sek vnode_t *vp, *rvp; 193fa9e4066Sahrens zfsctl_node_t *zcp; 194fa9e4066Sahrens 195fa9e4066Sahrens ASSERT(zfsvfs->z_ctldir == NULL); 196fa9e4066Sahrens 197fa9e4066Sahrens vp = gfs_root_create(sizeof (zfsctl_node_t), zfsvfs->z_vfs, 198fa9e4066Sahrens zfsctl_ops_root, ZFSCTL_INO_ROOT, zfsctl_root_entries, 199fa9e4066Sahrens zfsctl_root_inode_cb, MAXNAMELEN, NULL, NULL); 200fa9e4066Sahrens zcp = vp->v_data; 201fa9e4066Sahrens zcp->zc_id = ZFSCTL_INO_ROOT; 202fa9e4066Sahrens 203a32fded1Sek VERIFY(VFS_ROOT(zfsvfs->z_vfs, &rvp) == 0); 204a32fded1Sek ZFS_TIME_DECODE(&zcp->zc_cmtime, VTOZ(rvp)->z_phys->zp_crtime); 205a32fded1Sek VN_RELE(rvp); 206a32fded1Sek 207fa9e4066Sahrens /* 208fa9e4066Sahrens * We're only faking the fact that we have a root of a filesystem for 209fa9e4066Sahrens * the sake of the GFS interfaces. Undo the flag manipulation it did 210fa9e4066Sahrens * for us. 211fa9e4066Sahrens */ 212fa9e4066Sahrens vp->v_flag &= ~(VROOT | VNOCACHE | VNOMAP | VNOSWAP | VNOMOUNT); 213fa9e4066Sahrens 214fa9e4066Sahrens zfsvfs->z_ctldir = vp; 215fa9e4066Sahrens } 216fa9e4066Sahrens 217fa9e4066Sahrens /* 2188afd4dd6Sperrin * Destroy the '.zfs' directory. Only called when the filesystem is unmounted. 2198afd4dd6Sperrin * There might still be more references if we were force unmounted, but only 2208afd4dd6Sperrin * new zfs_inactive() calls can occur and they don't reference .zfs 221fa9e4066Sahrens */ 222fa9e4066Sahrens void 223fa9e4066Sahrens zfsctl_destroy(zfsvfs_t *zfsvfs) 224fa9e4066Sahrens { 225fa9e4066Sahrens VN_RELE(zfsvfs->z_ctldir); 226fa9e4066Sahrens zfsvfs->z_ctldir = NULL; 227fa9e4066Sahrens } 228fa9e4066Sahrens 229fa9e4066Sahrens /* 230fa9e4066Sahrens * Given a root znode, retrieve the associated .zfs directory. 231fa9e4066Sahrens * Add a hold to the vnode and return it. 232fa9e4066Sahrens */ 233fa9e4066Sahrens vnode_t * 234fa9e4066Sahrens zfsctl_root(znode_t *zp) 235fa9e4066Sahrens { 236fa9e4066Sahrens ASSERT(zfs_has_ctldir(zp)); 237fa9e4066Sahrens VN_HOLD(zp->z_zfsvfs->z_ctldir); 238fa9e4066Sahrens return (zp->z_zfsvfs->z_ctldir); 239fa9e4066Sahrens } 240fa9e4066Sahrens 241fa9e4066Sahrens /* 242fa9e4066Sahrens * Common open routine. Disallow any write access. 243fa9e4066Sahrens */ 244fa9e4066Sahrens /* ARGSUSED */ 245fa9e4066Sahrens static int 246fa9e4066Sahrens zfsctl_common_open(vnode_t **vpp, int flags, cred_t *cr) 247fa9e4066Sahrens { 248fa9e4066Sahrens if (flags & FWRITE) 249fa9e4066Sahrens return (EACCES); 250fa9e4066Sahrens 251fa9e4066Sahrens return (0); 252fa9e4066Sahrens } 253fa9e4066Sahrens 254fa9e4066Sahrens /* 255fa9e4066Sahrens * Common close routine. Nothing to do here. 256fa9e4066Sahrens */ 257fa9e4066Sahrens /* ARGSUSED */ 258fa9e4066Sahrens static int 259fa9e4066Sahrens zfsctl_common_close(vnode_t *vpp, int flags, int count, offset_t off, 260fa9e4066Sahrens cred_t *cr) 261fa9e4066Sahrens { 262fa9e4066Sahrens return (0); 263fa9e4066Sahrens } 264fa9e4066Sahrens 265fa9e4066Sahrens /* 266fa9e4066Sahrens * Common access routine. Disallow writes. 267fa9e4066Sahrens */ 268fa9e4066Sahrens /* ARGSUSED */ 269fa9e4066Sahrens static int 270fa9e4066Sahrens zfsctl_common_access(vnode_t *vp, int mode, int flags, cred_t *cr) 271fa9e4066Sahrens { 272fa9e4066Sahrens if (mode & VWRITE) 273fa9e4066Sahrens return (EACCES); 274fa9e4066Sahrens 275fa9e4066Sahrens return (0); 276fa9e4066Sahrens } 277fa9e4066Sahrens 278fa9e4066Sahrens /* 279fa9e4066Sahrens * Common getattr function. Fill in basic information. 280fa9e4066Sahrens */ 281fa9e4066Sahrens static void 282fa9e4066Sahrens zfsctl_common_getattr(vnode_t *vp, vattr_t *vap) 283fa9e4066Sahrens { 284a32fded1Sek zfsctl_node_t *zcp = vp->v_data; 285a32fded1Sek timestruc_t now; 286fa9e4066Sahrens 287fa9e4066Sahrens vap->va_uid = 0; 288fa9e4066Sahrens vap->va_gid = 0; 289fa9e4066Sahrens vap->va_rdev = 0; 290fa9e4066Sahrens /* 291fa9e4066Sahrens * We are a purly virtual object, so we have no 292fa9e4066Sahrens * blocksize or allocated blocks. 293fa9e4066Sahrens */ 294fa9e4066Sahrens vap->va_blksize = 0; 295fa9e4066Sahrens vap->va_nblocks = 0; 296fa9e4066Sahrens vap->va_seq = 0; 297fa9e4066Sahrens vap->va_fsid = vp->v_vfsp->vfs_dev; 298fa9e4066Sahrens vap->va_mode = S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP | 299fa9e4066Sahrens S_IROTH | S_IXOTH; 300fa9e4066Sahrens vap->va_type = VDIR; 301fa9e4066Sahrens /* 302a32fded1Sek * We live in the now (for atime). 303fa9e4066Sahrens */ 304fa9e4066Sahrens gethrestime(&now); 305a32fded1Sek vap->va_atime = now; 306a32fded1Sek vap->va_mtime = vap->va_ctime = zcp->zc_cmtime; 307fa9e4066Sahrens } 308fa9e4066Sahrens 309fa9e4066Sahrens static int 310fa9e4066Sahrens zfsctl_common_fid(vnode_t *vp, fid_t *fidp) 311fa9e4066Sahrens { 312fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 313fa9e4066Sahrens zfsctl_node_t *zcp = vp->v_data; 314fa9e4066Sahrens uint64_t object = zcp->zc_id; 315fa9e4066Sahrens zfid_short_t *zfid; 316fa9e4066Sahrens int i; 317fa9e4066Sahrens 318fa9e4066Sahrens ZFS_ENTER(zfsvfs); 319fa9e4066Sahrens 320fa9e4066Sahrens if (fidp->fid_len < SHORT_FID_LEN) { 321fa9e4066Sahrens fidp->fid_len = SHORT_FID_LEN; 3220f2dc02eSek ZFS_EXIT(zfsvfs); 323fa9e4066Sahrens return (ENOSPC); 324fa9e4066Sahrens } 325fa9e4066Sahrens 326fa9e4066Sahrens zfid = (zfid_short_t *)fidp; 327fa9e4066Sahrens 328fa9e4066Sahrens zfid->zf_len = SHORT_FID_LEN; 329fa9e4066Sahrens 330fa9e4066Sahrens for (i = 0; i < sizeof (zfid->zf_object); i++) 331fa9e4066Sahrens zfid->zf_object[i] = (uint8_t)(object >> (8 * i)); 332fa9e4066Sahrens 333fa9e4066Sahrens /* .zfs znodes always have a generation number of 0 */ 334fa9e4066Sahrens for (i = 0; i < sizeof (zfid->zf_gen); i++) 335fa9e4066Sahrens zfid->zf_gen[i] = 0; 336fa9e4066Sahrens 337fa9e4066Sahrens ZFS_EXIT(zfsvfs); 338fa9e4066Sahrens return (0); 339fa9e4066Sahrens } 340fa9e4066Sahrens 341fa9e4066Sahrens /* 342fa9e4066Sahrens * .zfs inode namespace 343fa9e4066Sahrens * 344fa9e4066Sahrens * We need to generate unique inode numbers for all files and directories 345fa9e4066Sahrens * within the .zfs pseudo-filesystem. We use the following scheme: 346fa9e4066Sahrens * 347fa9e4066Sahrens * ENTRY ZFSCTL_INODE 348fa9e4066Sahrens * .zfs 1 349fa9e4066Sahrens * .zfs/snapshot 2 350fa9e4066Sahrens * .zfs/snapshot/<snap> objectid(snap) 351fa9e4066Sahrens */ 352fa9e4066Sahrens 353fa9e4066Sahrens #define ZFSCTL_INO_SNAP(id) (id) 354fa9e4066Sahrens 355fa9e4066Sahrens /* 356fa9e4066Sahrens * Get root directory attributes. 357fa9e4066Sahrens */ 358fa9e4066Sahrens /* ARGSUSED */ 359fa9e4066Sahrens static int 360fa9e4066Sahrens zfsctl_root_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr) 361fa9e4066Sahrens { 362fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 363fa9e4066Sahrens 364fa9e4066Sahrens ZFS_ENTER(zfsvfs); 365fa9e4066Sahrens vap->va_nodeid = ZFSCTL_INO_ROOT; 366fa9e4066Sahrens vap->va_nlink = vap->va_size = NROOT_ENTRIES; 367fa9e4066Sahrens 368fa9e4066Sahrens zfsctl_common_getattr(vp, vap); 369fa9e4066Sahrens ZFS_EXIT(zfsvfs); 370fa9e4066Sahrens 371fa9e4066Sahrens return (0); 372fa9e4066Sahrens } 373fa9e4066Sahrens 374fa9e4066Sahrens /* 375fa9e4066Sahrens * Special case the handling of "..". 376fa9e4066Sahrens */ 377fa9e4066Sahrens /* ARGSUSED */ 378fa9e4066Sahrens int 379fa9e4066Sahrens zfsctl_root_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, pathname_t *pnp, 380fa9e4066Sahrens int flags, vnode_t *rdir, cred_t *cr) 381fa9e4066Sahrens { 382fa9e4066Sahrens zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data; 383fa9e4066Sahrens int err; 384fa9e4066Sahrens 385fa9e4066Sahrens ZFS_ENTER(zfsvfs); 386fa9e4066Sahrens 387fa9e4066Sahrens if (strcmp(nm, "..") == 0) { 388fa9e4066Sahrens err = VFS_ROOT(dvp->v_vfsp, vpp); 389fa9e4066Sahrens } else { 390fa9e4066Sahrens err = gfs_dir_lookup(dvp, nm, vpp); 391fa9e4066Sahrens } 392fa9e4066Sahrens 393fa9e4066Sahrens ZFS_EXIT(zfsvfs); 394fa9e4066Sahrens 395fa9e4066Sahrens return (err); 396fa9e4066Sahrens } 397fa9e4066Sahrens 398fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_root[] = { 399aa59c4cbSrsb { VOPNAME_OPEN, { .vop_open = zfsctl_common_open } }, 400aa59c4cbSrsb { VOPNAME_CLOSE, { .vop_close = zfsctl_common_close } }, 401aa59c4cbSrsb { VOPNAME_IOCTL, { .error = fs_inval } }, 402aa59c4cbSrsb { VOPNAME_GETATTR, { .vop_getattr = zfsctl_root_getattr } }, 403aa59c4cbSrsb { VOPNAME_ACCESS, { .vop_access = zfsctl_common_access } }, 404aa59c4cbSrsb { VOPNAME_READDIR, { .vop_readdir = gfs_vop_readdir } }, 405aa59c4cbSrsb { VOPNAME_LOOKUP, { .vop_lookup = zfsctl_root_lookup } }, 406aa59c4cbSrsb { VOPNAME_SEEK, { .vop_seek = fs_seek } }, 407aa59c4cbSrsb { VOPNAME_INACTIVE, { .vop_inactive = gfs_vop_inactive } }, 408aa59c4cbSrsb { VOPNAME_FID, { .vop_fid = zfsctl_common_fid } }, 409fa9e4066Sahrens { NULL } 410fa9e4066Sahrens }; 411fa9e4066Sahrens 412fa9e4066Sahrens static int 413fa9e4066Sahrens zfsctl_snapshot_zname(vnode_t *vp, const char *name, int len, char *zname) 414fa9e4066Sahrens { 415fa9e4066Sahrens objset_t *os = ((zfsvfs_t *)((vp)->v_vfsp->vfs_data))->z_os; 416fa9e4066Sahrens 417fa9e4066Sahrens dmu_objset_name(os, zname); 4185422900bSmaybee if (strlen(zname) + 1 + strlen(name) >= len) 419fa9e4066Sahrens return (ENAMETOOLONG); 4205422900bSmaybee (void) strcat(zname, "@"); 421fa9e4066Sahrens (void) strcat(zname, name); 422fa9e4066Sahrens return (0); 423fa9e4066Sahrens } 424fa9e4066Sahrens 425ecd6cf80Smarks int 426fa9e4066Sahrens zfsctl_unmount_snap(vnode_t *dvp, const char *name, int force, cred_t *cr) 427fa9e4066Sahrens { 428fa9e4066Sahrens zfsctl_snapdir_t *sdp = dvp->v_data; 429fa9e4066Sahrens zfs_snapentry_t search, *sep; 430fa9e4066Sahrens avl_index_t where; 431fa9e4066Sahrens int err; 432fa9e4066Sahrens 433fa9e4066Sahrens ASSERT(MUTEX_HELD(&sdp->sd_lock)); 434fa9e4066Sahrens 435fa9e4066Sahrens search.se_name = (char *)name; 436fa9e4066Sahrens if ((sep = avl_find(&sdp->sd_snaps, &search, &where)) == NULL) 437fa9e4066Sahrens return (ENOENT); 438fa9e4066Sahrens 439fa9e4066Sahrens ASSERT(vn_ismntpt(sep->se_root)); 440fa9e4066Sahrens 441fa9e4066Sahrens /* this will be dropped by dounmount() */ 442fa9e4066Sahrens if ((err = vn_vfswlock(sep->se_root)) != 0) 443fa9e4066Sahrens return (err); 444fa9e4066Sahrens 445fa9e4066Sahrens VN_HOLD(sep->se_root); 446bbf4a8dfSmaybee err = dounmount(vn_mountedvfs(sep->se_root), force, kcred); 447bbf4a8dfSmaybee if (err) { 448bbf4a8dfSmaybee VN_RELE(sep->se_root); 449fa9e4066Sahrens return (err); 450bbf4a8dfSmaybee } 451fa9e4066Sahrens ASSERT(sep->se_root->v_count == 1); 452fa9e4066Sahrens gfs_vop_inactive(sep->se_root, cr); 453fa9e4066Sahrens 454fa9e4066Sahrens avl_remove(&sdp->sd_snaps, sep); 455fa9e4066Sahrens kmem_free(sep->se_name, strlen(sep->se_name) + 1); 456fa9e4066Sahrens kmem_free(sep, sizeof (zfs_snapentry_t)); 457fa9e4066Sahrens 458fa9e4066Sahrens return (0); 459fa9e4066Sahrens } 460fa9e4066Sahrens 461fa9e4066Sahrens 4625422900bSmaybee static void 463fa9e4066Sahrens zfsctl_rename_snap(zfsctl_snapdir_t *sdp, zfs_snapentry_t *sep, const char *nm) 464fa9e4066Sahrens { 465fa9e4066Sahrens avl_index_t where; 466fa9e4066Sahrens vfs_t *vfsp; 467fa9e4066Sahrens refstr_t *pathref; 468fa9e4066Sahrens char newpath[MAXNAMELEN]; 469fa9e4066Sahrens char *tail; 470fa9e4066Sahrens 471fa9e4066Sahrens ASSERT(MUTEX_HELD(&sdp->sd_lock)); 472fa9e4066Sahrens ASSERT(sep != NULL); 473fa9e4066Sahrens 474fa9e4066Sahrens vfsp = vn_mountedvfs(sep->se_root); 475fa9e4066Sahrens ASSERT(vfsp != NULL); 476fa9e4066Sahrens 4775422900bSmaybee vfs_lock_wait(vfsp); 478fa9e4066Sahrens 479fa9e4066Sahrens /* 480fa9e4066Sahrens * Change the name in the AVL tree. 481fa9e4066Sahrens */ 482fa9e4066Sahrens avl_remove(&sdp->sd_snaps, sep); 483fa9e4066Sahrens kmem_free(sep->se_name, strlen(sep->se_name) + 1); 484fa9e4066Sahrens sep->se_name = kmem_alloc(strlen(nm) + 1, KM_SLEEP); 485fa9e4066Sahrens (void) strcpy(sep->se_name, nm); 486fa9e4066Sahrens VERIFY(avl_find(&sdp->sd_snaps, sep, &where) == NULL); 487fa9e4066Sahrens avl_insert(&sdp->sd_snaps, sep, where); 488fa9e4066Sahrens 489fa9e4066Sahrens /* 490fa9e4066Sahrens * Change the current mountpoint info: 491fa9e4066Sahrens * - update the tail of the mntpoint path 492fa9e4066Sahrens * - update the tail of the resource path 493fa9e4066Sahrens */ 494fa9e4066Sahrens pathref = vfs_getmntpoint(vfsp); 4950b69c2f0Sahrens (void) strncpy(newpath, refstr_value(pathref), sizeof (newpath)); 4960b69c2f0Sahrens VERIFY((tail = strrchr(newpath, '/')) != NULL); 4970b69c2f0Sahrens *(tail+1) = '\0'; 4980b69c2f0Sahrens ASSERT3U(strlen(newpath) + strlen(nm), <, sizeof (newpath)); 499fa9e4066Sahrens (void) strcat(newpath, nm); 500fa9e4066Sahrens refstr_rele(pathref); 501fa9e4066Sahrens vfs_setmntpoint(vfsp, newpath); 502fa9e4066Sahrens 503fa9e4066Sahrens pathref = vfs_getresource(vfsp); 5040b69c2f0Sahrens (void) strncpy(newpath, refstr_value(pathref), sizeof (newpath)); 5050b69c2f0Sahrens VERIFY((tail = strrchr(newpath, '@')) != NULL); 5060b69c2f0Sahrens *(tail+1) = '\0'; 5070b69c2f0Sahrens ASSERT3U(strlen(newpath) + strlen(nm), <, sizeof (newpath)); 508fa9e4066Sahrens (void) strcat(newpath, nm); 509fa9e4066Sahrens refstr_rele(pathref); 510fa9e4066Sahrens vfs_setresource(vfsp, newpath); 511fa9e4066Sahrens 512fa9e4066Sahrens vfs_unlock(vfsp); 513fa9e4066Sahrens } 514fa9e4066Sahrens 515fa9e4066Sahrens static int 516fa9e4066Sahrens zfsctl_snapdir_rename(vnode_t *sdvp, char *snm, vnode_t *tdvp, char *tnm, 517fa9e4066Sahrens cred_t *cr) 518fa9e4066Sahrens { 519fa9e4066Sahrens zfsctl_snapdir_t *sdp = sdvp->v_data; 520fa9e4066Sahrens zfs_snapentry_t search, *sep; 521fa9e4066Sahrens avl_index_t where; 522fa9e4066Sahrens char from[MAXNAMELEN], to[MAXNAMELEN]; 523fa9e4066Sahrens int err; 524fa9e4066Sahrens 5255422900bSmaybee err = zfsctl_snapshot_zname(sdvp, snm, MAXNAMELEN, from); 5265422900bSmaybee if (err) 5275422900bSmaybee return (err); 528ecd6cf80Smarks 529ecd6cf80Smarks err = zfsctl_snapshot_zname(tdvp, tnm, MAXNAMELEN, to); 530fa9e4066Sahrens if (err) 531fa9e4066Sahrens return (err); 532fa9e4066Sahrens 533ecd6cf80Smarks if (err = zfs_secpolicy_rename_perms(from, to, cr)) 534ecd6cf80Smarks return (err); 535fa9e4066Sahrens /* 536fa9e4066Sahrens * Cannot move snapshots out of the snapdir. 537fa9e4066Sahrens */ 538fa9e4066Sahrens if (sdvp != tdvp) 539fa9e4066Sahrens return (EINVAL); 540fa9e4066Sahrens 541fa9e4066Sahrens if (strcmp(snm, tnm) == 0) 542fa9e4066Sahrens return (0); 543fa9e4066Sahrens 544fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 545fa9e4066Sahrens 546fa9e4066Sahrens search.se_name = (char *)snm; 5475422900bSmaybee if ((sep = avl_find(&sdp->sd_snaps, &search, &where)) == NULL) { 5485422900bSmaybee mutex_exit(&sdp->sd_lock); 5495422900bSmaybee return (ENOENT); 550fa9e4066Sahrens } 551fa9e4066Sahrens 552cdf5b4caSmmusante err = dmu_objset_rename(from, to, B_FALSE); 5535422900bSmaybee if (err == 0) 5545422900bSmaybee zfsctl_rename_snap(sdp, sep, tnm); 555fa9e4066Sahrens 556fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 557fa9e4066Sahrens 558fa9e4066Sahrens return (err); 559fa9e4066Sahrens } 560fa9e4066Sahrens 561fa9e4066Sahrens /* ARGSUSED */ 562fa9e4066Sahrens static int 563fa9e4066Sahrens zfsctl_snapdir_remove(vnode_t *dvp, char *name, vnode_t *cwd, cred_t *cr) 564fa9e4066Sahrens { 565fa9e4066Sahrens zfsctl_snapdir_t *sdp = dvp->v_data; 566fa9e4066Sahrens char snapname[MAXNAMELEN]; 567fa9e4066Sahrens int err; 568fa9e4066Sahrens 5695422900bSmaybee err = zfsctl_snapshot_zname(dvp, name, MAXNAMELEN, snapname); 5705422900bSmaybee if (err) 5715422900bSmaybee return (err); 572ecd6cf80Smarks 573ecd6cf80Smarks if (err = zfs_secpolicy_destroy_perms(snapname, cr)) 574fa9e4066Sahrens return (err); 575fa9e4066Sahrens 576fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 577fa9e4066Sahrens 578ecd6cf80Smarks err = zfsctl_unmount_snap(dvp, name, MS_FORCE, cr); 579fa9e4066Sahrens if (err) { 580fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 581fa9e4066Sahrens return (err); 582fa9e4066Sahrens } 583fa9e4066Sahrens 584fa9e4066Sahrens err = dmu_objset_destroy(snapname); 585fa9e4066Sahrens 586fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 587fa9e4066Sahrens 588fa9e4066Sahrens return (err); 589fa9e4066Sahrens } 590fa9e4066Sahrens 591*f18faf3fSek /* 592*f18faf3fSek * This creates a snapshot under '.zfs/snapshot'. 593*f18faf3fSek */ 594ecd6cf80Smarks /* ARGSUSED */ 595ecd6cf80Smarks static int 596ecd6cf80Smarks zfsctl_snapdir_mkdir(vnode_t *dvp, char *dirname, vattr_t *vap, vnode_t **vpp, 597ecd6cf80Smarks cred_t *cr) 598ecd6cf80Smarks { 599ecd6cf80Smarks zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data; 600ecd6cf80Smarks char name[MAXNAMELEN]; 601ecd6cf80Smarks int err; 602ecd6cf80Smarks static enum symfollow follow = NO_FOLLOW; 603ecd6cf80Smarks static enum uio_seg seg = UIO_SYSSPACE; 604ecd6cf80Smarks 605ecd6cf80Smarks dmu_objset_name(zfsvfs->z_os, name); 606ecd6cf80Smarks 607ecd6cf80Smarks *vpp = NULL; 608ecd6cf80Smarks 609ecd6cf80Smarks err = zfs_secpolicy_snapshot_perms(name, cr); 610ecd6cf80Smarks if (err) 611ecd6cf80Smarks return (err); 612ecd6cf80Smarks 613ecd6cf80Smarks if (err == 0) { 614ecd6cf80Smarks err = dmu_objset_snapshot(name, dirname, B_FALSE); 615ecd6cf80Smarks if (err) 616ecd6cf80Smarks return (err); 617ecd6cf80Smarks err = lookupnameat(dirname, seg, follow, NULL, vpp, dvp); 618ecd6cf80Smarks } 619ecd6cf80Smarks 620ecd6cf80Smarks return (err); 621ecd6cf80Smarks } 622ecd6cf80Smarks 623fa9e4066Sahrens /* 624fa9e4066Sahrens * Lookup entry point for the 'snapshot' directory. Try to open the 625fa9e4066Sahrens * snapshot if it exist, creating the pseudo filesystem vnode as necessary. 626fa9e4066Sahrens * Perform a mount of the associated dataset on top of the vnode. 627fa9e4066Sahrens */ 628fa9e4066Sahrens /* ARGSUSED */ 629fa9e4066Sahrens static int 630fa9e4066Sahrens zfsctl_snapdir_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, pathname_t *pnp, 631fa9e4066Sahrens int flags, vnode_t *rdir, cred_t *cr) 632fa9e4066Sahrens { 633fa9e4066Sahrens zfsctl_snapdir_t *sdp = dvp->v_data; 634fa9e4066Sahrens objset_t *snap; 635fa9e4066Sahrens char snapname[MAXNAMELEN]; 636fa9e4066Sahrens char *mountpoint; 637fa9e4066Sahrens zfs_snapentry_t *sep, search; 638fa9e4066Sahrens struct mounta margs; 639fa9e4066Sahrens vfs_t *vfsp; 640fa9e4066Sahrens size_t mountpoint_len; 641fa9e4066Sahrens avl_index_t where; 642fa9e4066Sahrens zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data; 643fa9e4066Sahrens int err; 644fa9e4066Sahrens 645fa9e4066Sahrens ASSERT(dvp->v_type == VDIR); 646fa9e4066Sahrens 647fa9e4066Sahrens if (gfs_lookup_dot(vpp, dvp, zfsvfs->z_ctldir, nm) == 0) 648fa9e4066Sahrens return (0); 649fa9e4066Sahrens 650fa9e4066Sahrens /* 651fa9e4066Sahrens * If we get a recursive call, that means we got called 652fa9e4066Sahrens * from the domount() code while it was trying to look up the 653fa9e4066Sahrens * spec (which looks like a local path for zfs). We need to 654fa9e4066Sahrens * add some flag to domount() to tell it not to do this lookup. 655fa9e4066Sahrens */ 656fa9e4066Sahrens if (MUTEX_HELD(&sdp->sd_lock)) 657fa9e4066Sahrens return (ENOENT); 658fa9e4066Sahrens 659fa9e4066Sahrens ZFS_ENTER(zfsvfs); 660fa9e4066Sahrens 661fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 662fa9e4066Sahrens search.se_name = (char *)nm; 663fa9e4066Sahrens if ((sep = avl_find(&sdp->sd_snaps, &search, &where)) != NULL) { 664fa9e4066Sahrens *vpp = sep->se_root; 665fa9e4066Sahrens VN_HOLD(*vpp); 666bbf4a8dfSmaybee err = traverse(vpp); 667bbf4a8dfSmaybee if (err) { 668bbf4a8dfSmaybee VN_RELE(*vpp); 669bbf4a8dfSmaybee *vpp = NULL; 670bbf4a8dfSmaybee } else if (*vpp == sep->se_root) { 671bbf4a8dfSmaybee /* 672bbf4a8dfSmaybee * The snapshot was unmounted behind our backs, 673bbf4a8dfSmaybee * try to remount it. 674bbf4a8dfSmaybee */ 675fa9e4066Sahrens goto domount; 676bb963f1cSmaybee } 677fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 678fa9e4066Sahrens ZFS_EXIT(zfsvfs); 679bbf4a8dfSmaybee return (err); 680fa9e4066Sahrens } 681fa9e4066Sahrens 682fa9e4066Sahrens /* 683fa9e4066Sahrens * The requested snapshot is not currently mounted, look it up. 684fa9e4066Sahrens */ 6855422900bSmaybee err = zfsctl_snapshot_zname(dvp, nm, MAXNAMELEN, snapname); 6865422900bSmaybee if (err) { 6875422900bSmaybee mutex_exit(&sdp->sd_lock); 6885422900bSmaybee ZFS_EXIT(zfsvfs); 6895422900bSmaybee return (err); 6905422900bSmaybee } 691fa9e4066Sahrens if (dmu_objset_open(snapname, DMU_OST_ZFS, 692fa9e4066Sahrens DS_MODE_STANDARD | DS_MODE_READONLY, &snap) != 0) { 693fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 694fa9e4066Sahrens ZFS_EXIT(zfsvfs); 695fa9e4066Sahrens return (ENOENT); 696fa9e4066Sahrens } 697fa9e4066Sahrens 698fa9e4066Sahrens sep = kmem_alloc(sizeof (zfs_snapentry_t), KM_SLEEP); 699fa9e4066Sahrens sep->se_name = kmem_alloc(strlen(nm) + 1, KM_SLEEP); 700fa9e4066Sahrens (void) strcpy(sep->se_name, nm); 701fa9e4066Sahrens *vpp = sep->se_root = zfsctl_snapshot_mknode(dvp, dmu_objset_id(snap)); 702fa9e4066Sahrens avl_insert(&sdp->sd_snaps, sep, where); 703fa9e4066Sahrens 704fa9e4066Sahrens dmu_objset_close(snap); 705fa9e4066Sahrens domount: 706fa9e4066Sahrens mountpoint_len = strlen(refstr_value(dvp->v_vfsp->vfs_mntpt)) + 707fa9e4066Sahrens strlen("/.zfs/snapshot/") + strlen(nm) + 1; 708fa9e4066Sahrens mountpoint = kmem_alloc(mountpoint_len, KM_SLEEP); 709fa9e4066Sahrens (void) snprintf(mountpoint, mountpoint_len, "%s/.zfs/snapshot/%s", 710fa9e4066Sahrens refstr_value(dvp->v_vfsp->vfs_mntpt), nm); 711fa9e4066Sahrens 712fa9e4066Sahrens margs.spec = snapname; 713fa9e4066Sahrens margs.dir = mountpoint; 714fa9e4066Sahrens margs.flags = MS_SYSSPACE | MS_NOMNTTAB; 715fa9e4066Sahrens margs.fstype = "zfs"; 716fa9e4066Sahrens margs.dataptr = NULL; 717fa9e4066Sahrens margs.datalen = 0; 718fa9e4066Sahrens margs.optptr = NULL; 719fa9e4066Sahrens margs.optlen = 0; 720fa9e4066Sahrens 721fa9e4066Sahrens err = domount("zfs", &margs, *vpp, kcred, &vfsp); 722fa9e4066Sahrens kmem_free(mountpoint, mountpoint_len); 723fa9e4066Sahrens 72495c9592aSmaybee if (err == 0) { 72595c9592aSmaybee /* 72695c9592aSmaybee * Return the mounted root rather than the covered mount point. 727*f18faf3fSek * Takes the GFS vnode at .zfs/snapshot/<snapname> and returns 728*f18faf3fSek * the ZFS vnode mounted on top of the GFS node. This ZFS 729*f18faf3fSek * vnode is the root the newly created vfsp. 73095c9592aSmaybee */ 73195c9592aSmaybee VFS_RELE(vfsp); 73295c9592aSmaybee err = traverse(vpp); 73395c9592aSmaybee } 734fa9e4066Sahrens 73595c9592aSmaybee if (err == 0) { 73695c9592aSmaybee /* 737*f18faf3fSek * Fix up the root vnode mounted on .zfs/snapshot/<snapname>. 738ed097989Sek * 739ed097989Sek * This is where we lie about our v_vfsp in order to 740*f18faf3fSek * make .zfs/snapshot/<snapname> accessible over NFS 741*f18faf3fSek * without requiring manual mounts of <snapname>. 74295c9592aSmaybee */ 74395c9592aSmaybee ASSERT(VTOZ(*vpp)->z_zfsvfs != zfsvfs); 74495c9592aSmaybee VTOZ(*vpp)->z_zfsvfs->z_parent = zfsvfs; 74595c9592aSmaybee (*vpp)->v_vfsp = zfsvfs->z_vfs; 74695c9592aSmaybee (*vpp)->v_flag &= ~VROOT; 74795c9592aSmaybee } 748fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 749fa9e4066Sahrens ZFS_EXIT(zfsvfs); 750fa9e4066Sahrens 751bb963f1cSmaybee /* 752bb963f1cSmaybee * If we had an error, drop our hold on the vnode and 753bb963f1cSmaybee * zfsctl_snapshot_inactive() will clean up. 754bb963f1cSmaybee */ 755bb963f1cSmaybee if (err) { 75695c9592aSmaybee VN_RELE(*vpp); 757bb963f1cSmaybee *vpp = NULL; 758bb963f1cSmaybee } 75995c9592aSmaybee return (err); 760fa9e4066Sahrens } 761fa9e4066Sahrens 762fa9e4066Sahrens /* ARGSUSED */ 763fa9e4066Sahrens static int 764fa9e4066Sahrens zfsctl_snapdir_readdir_cb(vnode_t *vp, struct dirent64 *dp, int *eofp, 765fa9e4066Sahrens offset_t *offp, offset_t *nextp, void *data) 766fa9e4066Sahrens { 767fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 768fa9e4066Sahrens char snapname[MAXNAMELEN]; 769fa9e4066Sahrens uint64_t id, cookie; 770fa9e4066Sahrens 771fa9e4066Sahrens ZFS_ENTER(zfsvfs); 772fa9e4066Sahrens 773fa9e4066Sahrens cookie = *offp; 774fa9e4066Sahrens if (dmu_snapshot_list_next(zfsvfs->z_os, MAXNAMELEN, snapname, &id, 775fa9e4066Sahrens &cookie) == ENOENT) { 776fa9e4066Sahrens *eofp = 1; 777fa9e4066Sahrens ZFS_EXIT(zfsvfs); 778fa9e4066Sahrens return (0); 779fa9e4066Sahrens } 780fa9e4066Sahrens 781fa9e4066Sahrens (void) strcpy(dp->d_name, snapname); 782fa9e4066Sahrens dp->d_ino = ZFSCTL_INO_SNAP(id); 783fa9e4066Sahrens *nextp = cookie; 784fa9e4066Sahrens 785fa9e4066Sahrens ZFS_EXIT(zfsvfs); 786fa9e4066Sahrens 787fa9e4066Sahrens return (0); 788fa9e4066Sahrens } 789fa9e4066Sahrens 790*f18faf3fSek /* 791*f18faf3fSek * pvp is the '.zfs' directory (zfsctl_node_t). 792*f18faf3fSek * Creates vp, which is '.zfs/snapshot' (zfsctl_snapdir_t). 793*f18faf3fSek * 794*f18faf3fSek * This function is the callback to create a GFS vnode for '.zfs/snapshot' 795*f18faf3fSek * when a lookup is performed on .zfs for "snapshot". 796*f18faf3fSek */ 797fa9e4066Sahrens vnode_t * 798fa9e4066Sahrens zfsctl_mknode_snapdir(vnode_t *pvp) 799fa9e4066Sahrens { 800fa9e4066Sahrens vnode_t *vp; 801fa9e4066Sahrens zfsctl_snapdir_t *sdp; 802fa9e4066Sahrens 803fa9e4066Sahrens vp = gfs_dir_create(sizeof (zfsctl_snapdir_t), pvp, 804fa9e4066Sahrens zfsctl_ops_snapdir, NULL, NULL, MAXNAMELEN, 805fa9e4066Sahrens zfsctl_snapdir_readdir_cb, NULL); 806fa9e4066Sahrens sdp = vp->v_data; 807fa9e4066Sahrens sdp->sd_node.zc_id = ZFSCTL_INO_SNAPDIR; 808a32fded1Sek sdp->sd_node.zc_cmtime = ((zfsctl_node_t *)pvp->v_data)->zc_cmtime; 809fa9e4066Sahrens mutex_init(&sdp->sd_lock, NULL, MUTEX_DEFAULT, NULL); 810fa9e4066Sahrens avl_create(&sdp->sd_snaps, snapentry_compare, 811fa9e4066Sahrens sizeof (zfs_snapentry_t), offsetof(zfs_snapentry_t, se_node)); 812fa9e4066Sahrens return (vp); 813fa9e4066Sahrens } 814fa9e4066Sahrens 815fa9e4066Sahrens /* ARGSUSED */ 816fa9e4066Sahrens static int 817fa9e4066Sahrens zfsctl_snapdir_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr) 818fa9e4066Sahrens { 819fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 820fa9e4066Sahrens zfsctl_snapdir_t *sdp = vp->v_data; 821fa9e4066Sahrens 822fa9e4066Sahrens ZFS_ENTER(zfsvfs); 823fa9e4066Sahrens zfsctl_common_getattr(vp, vap); 824fa9e4066Sahrens vap->va_nodeid = gfs_file_inode(vp); 825fa9e4066Sahrens vap->va_nlink = vap->va_size = avl_numnodes(&sdp->sd_snaps) + 2; 826fa9e4066Sahrens ZFS_EXIT(zfsvfs); 827fa9e4066Sahrens 828fa9e4066Sahrens return (0); 829fa9e4066Sahrens } 830fa9e4066Sahrens 831bb963f1cSmaybee /* ARGSUSED */ 832fa9e4066Sahrens static void 833fa9e4066Sahrens zfsctl_snapdir_inactive(vnode_t *vp, cred_t *cr) 834fa9e4066Sahrens { 835fa9e4066Sahrens zfsctl_snapdir_t *sdp = vp->v_data; 836bb963f1cSmaybee void *private; 837bb963f1cSmaybee 838bb963f1cSmaybee private = gfs_dir_inactive(vp); 839bb963f1cSmaybee if (private != NULL) { 840bb963f1cSmaybee ASSERT(avl_numnodes(&sdp->sd_snaps) == 0); 841bb963f1cSmaybee mutex_destroy(&sdp->sd_lock); 842bb963f1cSmaybee avl_destroy(&sdp->sd_snaps); 843bb963f1cSmaybee kmem_free(private, sizeof (zfsctl_snapdir_t)); 844bb963f1cSmaybee } 845fa9e4066Sahrens } 846fa9e4066Sahrens 847fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapdir[] = { 848aa59c4cbSrsb { VOPNAME_OPEN, { .vop_open = zfsctl_common_open } }, 849aa59c4cbSrsb { VOPNAME_CLOSE, { .vop_close = zfsctl_common_close } }, 850aa59c4cbSrsb { VOPNAME_IOCTL, { .error = fs_inval } }, 851aa59c4cbSrsb { VOPNAME_GETATTR, { .vop_getattr = zfsctl_snapdir_getattr } }, 852aa59c4cbSrsb { VOPNAME_ACCESS, { .vop_access = zfsctl_common_access } }, 853aa59c4cbSrsb { VOPNAME_RENAME, { .vop_rename = zfsctl_snapdir_rename } }, 854aa59c4cbSrsb { VOPNAME_RMDIR, { .vop_rmdir = zfsctl_snapdir_remove } }, 855ecd6cf80Smarks { VOPNAME_MKDIR, { .vop_mkdir = zfsctl_snapdir_mkdir } }, 856aa59c4cbSrsb { VOPNAME_READDIR, { .vop_readdir = gfs_vop_readdir } }, 857aa59c4cbSrsb { VOPNAME_LOOKUP, { .vop_lookup = zfsctl_snapdir_lookup } }, 858aa59c4cbSrsb { VOPNAME_SEEK, { .vop_seek = fs_seek } }, 859aa59c4cbSrsb { VOPNAME_INACTIVE, { .vop_inactive = zfsctl_snapdir_inactive } }, 860aa59c4cbSrsb { VOPNAME_FID, { .vop_fid = zfsctl_common_fid } }, 861fa9e4066Sahrens { NULL } 862fa9e4066Sahrens }; 863fa9e4066Sahrens 864*f18faf3fSek /* 865*f18faf3fSek * pvp is the GFS vnode '.zfs/snapshot'. 866*f18faf3fSek * 867*f18faf3fSek * This creates a GFS node under '.zfs/snapshot' representing each 868*f18faf3fSek * snapshot. This newly created GFS node is what we mount snapshot 869*f18faf3fSek * vfs_t's ontop of. 870*f18faf3fSek */ 871fa9e4066Sahrens static vnode_t * 872fa9e4066Sahrens zfsctl_snapshot_mknode(vnode_t *pvp, uint64_t objset) 873fa9e4066Sahrens { 874fa9e4066Sahrens vnode_t *vp; 875fa9e4066Sahrens zfsctl_node_t *zcp; 876fa9e4066Sahrens 877fa9e4066Sahrens vp = gfs_dir_create(sizeof (zfsctl_node_t), pvp, 878fa9e4066Sahrens zfsctl_ops_snapshot, NULL, NULL, MAXNAMELEN, NULL, NULL); 879fa9e4066Sahrens zcp = vp->v_data; 880fa9e4066Sahrens zcp->zc_id = objset; 881fa9e4066Sahrens 882fa9e4066Sahrens return (vp); 883fa9e4066Sahrens } 884fa9e4066Sahrens 885fa9e4066Sahrens static void 886fa9e4066Sahrens zfsctl_snapshot_inactive(vnode_t *vp, cred_t *cr) 887fa9e4066Sahrens { 888fa9e4066Sahrens zfsctl_snapdir_t *sdp; 889fa9e4066Sahrens zfs_snapentry_t *sep, *next; 890fa9e4066Sahrens vnode_t *dvp; 891fa9e4066Sahrens 892fa9e4066Sahrens VERIFY(gfs_dir_lookup(vp, "..", &dvp) == 0); 893fa9e4066Sahrens sdp = dvp->v_data; 894fa9e4066Sahrens 895fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 896fa9e4066Sahrens 897fa9e4066Sahrens if (vp->v_count > 1) { 898fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 899fa9e4066Sahrens return; 900fa9e4066Sahrens } 901fa9e4066Sahrens ASSERT(!vn_ismntpt(vp)); 902fa9e4066Sahrens 903fa9e4066Sahrens sep = avl_first(&sdp->sd_snaps); 904fa9e4066Sahrens while (sep != NULL) { 905fa9e4066Sahrens next = AVL_NEXT(&sdp->sd_snaps, sep); 906fa9e4066Sahrens 907fa9e4066Sahrens if (sep->se_root == vp) { 908fa9e4066Sahrens avl_remove(&sdp->sd_snaps, sep); 909fa9e4066Sahrens kmem_free(sep->se_name, strlen(sep->se_name) + 1); 910fa9e4066Sahrens kmem_free(sep, sizeof (zfs_snapentry_t)); 911fa9e4066Sahrens break; 912fa9e4066Sahrens } 913fa9e4066Sahrens sep = next; 914fa9e4066Sahrens } 915fa9e4066Sahrens ASSERT(sep != NULL); 916fa9e4066Sahrens 917fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 918fa9e4066Sahrens VN_RELE(dvp); 919fa9e4066Sahrens 920bb963f1cSmaybee /* 921bb963f1cSmaybee * Dispose of the vnode for the snapshot mount point. 922bb963f1cSmaybee * This is safe to do because once this entry has been removed 923bb963f1cSmaybee * from the AVL tree, it can't be found again, so cannot become 924bb963f1cSmaybee * "active". If we lookup the same name again we will end up 925bb963f1cSmaybee * creating a new vnode. 926bb963f1cSmaybee */ 927fa9e4066Sahrens gfs_vop_inactive(vp, cr); 928fa9e4066Sahrens } 929fa9e4066Sahrens 930fa9e4066Sahrens 931fa9e4066Sahrens /* 932fa9e4066Sahrens * These VP's should never see the light of day. They should always 933fa9e4066Sahrens * be covered. 934fa9e4066Sahrens */ 935fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapshot[] = { 936aa59c4cbSrsb VOPNAME_INACTIVE, { .vop_inactive = zfsctl_snapshot_inactive }, 937fa9e4066Sahrens NULL, NULL 938fa9e4066Sahrens }; 939fa9e4066Sahrens 940fa9e4066Sahrens int 941fa9e4066Sahrens zfsctl_lookup_objset(vfs_t *vfsp, uint64_t objsetid, zfsvfs_t **zfsvfsp) 942fa9e4066Sahrens { 943fa9e4066Sahrens zfsvfs_t *zfsvfs = vfsp->vfs_data; 944fa9e4066Sahrens vnode_t *dvp, *vp; 945fa9e4066Sahrens zfsctl_snapdir_t *sdp; 946fa9e4066Sahrens zfsctl_node_t *zcp; 947fa9e4066Sahrens zfs_snapentry_t *sep; 948fa9e4066Sahrens int error; 949fa9e4066Sahrens 950fa9e4066Sahrens ASSERT(zfsvfs->z_ctldir != NULL); 951fa9e4066Sahrens error = zfsctl_root_lookup(zfsvfs->z_ctldir, "snapshot", &dvp, 952fa9e4066Sahrens NULL, 0, NULL, kcred); 953fa9e4066Sahrens if (error != 0) 954fa9e4066Sahrens return (error); 955fa9e4066Sahrens sdp = dvp->v_data; 956fa9e4066Sahrens 957fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 958fa9e4066Sahrens sep = avl_first(&sdp->sd_snaps); 959fa9e4066Sahrens while (sep != NULL) { 960fa9e4066Sahrens vp = sep->se_root; 961fa9e4066Sahrens zcp = vp->v_data; 962fa9e4066Sahrens if (zcp->zc_id == objsetid) 963fa9e4066Sahrens break; 964fa9e4066Sahrens 965fa9e4066Sahrens sep = AVL_NEXT(&sdp->sd_snaps, sep); 966fa9e4066Sahrens } 967fa9e4066Sahrens 968fa9e4066Sahrens if (sep != NULL) { 969fa9e4066Sahrens VN_HOLD(vp); 970*f18faf3fSek /* 971*f18faf3fSek * Return the mounted root rather than the covered mount point. 972*f18faf3fSek * Takes the GFS vnode at .zfs/snapshot/<snapshot objsetid> 973*f18faf3fSek * and returns the ZFS vnode mounted on top of the GFS node. 974*f18faf3fSek * This ZFS vnode is the root of the vfs for objset 'objsetid'. 975*f18faf3fSek */ 976fa9e4066Sahrens error = traverse(&vp); 977bbf4a8dfSmaybee if (error == 0) { 978bbf4a8dfSmaybee if (vp == sep->se_root) 979bbf4a8dfSmaybee error = EINVAL; 980bbf4a8dfSmaybee else 981bbf4a8dfSmaybee *zfsvfsp = VTOZ(vp)->z_zfsvfs; 982bbf4a8dfSmaybee } 983fea70b54Snd mutex_exit(&sdp->sd_lock); 984fa9e4066Sahrens VN_RELE(vp); 985fa9e4066Sahrens } else { 986fa9e4066Sahrens error = EINVAL; 987fea70b54Snd mutex_exit(&sdp->sd_lock); 988fa9e4066Sahrens } 989fa9e4066Sahrens 990fa9e4066Sahrens VN_RELE(dvp); 991fa9e4066Sahrens 992fa9e4066Sahrens return (error); 993fa9e4066Sahrens } 994fa9e4066Sahrens 995fa9e4066Sahrens /* 996fa9e4066Sahrens * Unmount any snapshots for the given filesystem. This is called from 997fa9e4066Sahrens * zfs_umount() - if we have a ctldir, then go through and unmount all the 998fa9e4066Sahrens * snapshots. 999fa9e4066Sahrens */ 1000fa9e4066Sahrens int 1001fa9e4066Sahrens zfsctl_umount_snapshots(vfs_t *vfsp, int fflags, cred_t *cr) 1002fa9e4066Sahrens { 1003fa9e4066Sahrens zfsvfs_t *zfsvfs = vfsp->vfs_data; 1004fa9e4066Sahrens vnode_t *dvp, *svp; 1005fa9e4066Sahrens zfsctl_snapdir_t *sdp; 1006fa9e4066Sahrens zfs_snapentry_t *sep, *next; 1007fa9e4066Sahrens int error; 1008fa9e4066Sahrens 1009fa9e4066Sahrens ASSERT(zfsvfs->z_ctldir != NULL); 1010fa9e4066Sahrens error = zfsctl_root_lookup(zfsvfs->z_ctldir, "snapshot", &dvp, 1011fa9e4066Sahrens NULL, 0, NULL, cr); 1012fa9e4066Sahrens if (error != 0) 1013fa9e4066Sahrens return (error); 1014fa9e4066Sahrens sdp = dvp->v_data; 1015fa9e4066Sahrens 1016fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 1017fa9e4066Sahrens 1018fa9e4066Sahrens sep = avl_first(&sdp->sd_snaps); 1019fa9e4066Sahrens while (sep != NULL) { 1020fa9e4066Sahrens svp = sep->se_root; 1021fa9e4066Sahrens next = AVL_NEXT(&sdp->sd_snaps, sep); 1022fa9e4066Sahrens 1023fa9e4066Sahrens /* 1024fa9e4066Sahrens * If this snapshot is not mounted, then it must 1025fa9e4066Sahrens * have just been unmounted by somebody else, and 1026fa9e4066Sahrens * will be cleaned up by zfsctl_snapdir_inactive(). 1027fa9e4066Sahrens */ 1028fa9e4066Sahrens if (vn_ismntpt(svp)) { 1029fa9e4066Sahrens if ((error = vn_vfswlock(svp)) != 0) 1030fa9e4066Sahrens goto out; 1031fa9e4066Sahrens 1032fa9e4066Sahrens VN_HOLD(svp); 1033fa9e4066Sahrens error = dounmount(vn_mountedvfs(svp), fflags, cr); 1034fa9e4066Sahrens if (error) { 1035fa9e4066Sahrens VN_RELE(svp); 1036fa9e4066Sahrens goto out; 1037fa9e4066Sahrens } 1038fa9e4066Sahrens 1039fa9e4066Sahrens avl_remove(&sdp->sd_snaps, sep); 1040fa9e4066Sahrens kmem_free(sep->se_name, strlen(sep->se_name) + 1); 1041fa9e4066Sahrens kmem_free(sep, sizeof (zfs_snapentry_t)); 1042fa9e4066Sahrens 1043fa9e4066Sahrens /* 1044fa9e4066Sahrens * We can't use VN_RELE(), as that will try to 1045fa9e4066Sahrens * invoke zfsctl_snapdir_inactive(), and that 1046fa9e4066Sahrens * would lead to an attempt to re-grab the sd_lock. 1047fa9e4066Sahrens */ 1048fa9e4066Sahrens ASSERT3U(svp->v_count, ==, 1); 1049fa9e4066Sahrens gfs_vop_inactive(svp, cr); 1050fa9e4066Sahrens } 1051fa9e4066Sahrens sep = next; 1052fa9e4066Sahrens } 1053fa9e4066Sahrens out: 1054fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 1055fa9e4066Sahrens VN_RELE(dvp); 1056fa9e4066Sahrens 1057fa9e4066Sahrens return (error); 1058fa9e4066Sahrens } 1059