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. 56fa9e4066Sahrens */ 57fa9e4066Sahrens 58fa9e4066Sahrens #include <fs/fs_subr.h> 59fa9e4066Sahrens #include <sys/zfs_ctldir.h> 60fa9e4066Sahrens #include <sys/zfs_ioctl.h> 61fa9e4066Sahrens #include <sys/zfs_vfsops.h> 62aa59c4cbSrsb #include <sys/vfs_opreg.h> 63fa9e4066Sahrens #include <sys/gfs.h> 64fa9e4066Sahrens #include <sys/stat.h> 65fa9e4066Sahrens #include <sys/dmu.h> 66*ecd6cf80Smarks #include <sys/dsl_deleg.h> 67fa9e4066Sahrens #include <sys/mount.h> 68fa9e4066Sahrens 69fa9e4066Sahrens typedef struct { 70fa9e4066Sahrens char *se_name; 71fa9e4066Sahrens vnode_t *se_root; 72fa9e4066Sahrens avl_node_t se_node; 73fa9e4066Sahrens } zfs_snapentry_t; 74fa9e4066Sahrens 75fa9e4066Sahrens static int 76fa9e4066Sahrens snapentry_compare(const void *a, const void *b) 77fa9e4066Sahrens { 78fa9e4066Sahrens const zfs_snapentry_t *sa = a; 79fa9e4066Sahrens const zfs_snapentry_t *sb = b; 80fa9e4066Sahrens int ret = strcmp(sa->se_name, sb->se_name); 81fa9e4066Sahrens 82fa9e4066Sahrens if (ret < 0) 83fa9e4066Sahrens return (-1); 84fa9e4066Sahrens else if (ret > 0) 85fa9e4066Sahrens return (1); 86fa9e4066Sahrens else 87fa9e4066Sahrens return (0); 88fa9e4066Sahrens } 89fa9e4066Sahrens 90fa9e4066Sahrens vnodeops_t *zfsctl_ops_root; 91fa9e4066Sahrens vnodeops_t *zfsctl_ops_snapdir; 92fa9e4066Sahrens vnodeops_t *zfsctl_ops_snapshot; 93fa9e4066Sahrens 94fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_root[]; 95fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapdir[]; 96fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapshot[]; 97fa9e4066Sahrens 98fa9e4066Sahrens static vnode_t *zfsctl_mknode_snapdir(vnode_t *); 99fa9e4066Sahrens static vnode_t *zfsctl_snapshot_mknode(vnode_t *, uint64_t objset); 100fa9e4066Sahrens 101fa9e4066Sahrens static gfs_opsvec_t zfsctl_opsvec[] = { 102fa9e4066Sahrens { ".zfs", zfsctl_tops_root, &zfsctl_ops_root }, 103fa9e4066Sahrens { ".zfs/snapshot", zfsctl_tops_snapdir, &zfsctl_ops_snapdir }, 104fa9e4066Sahrens { ".zfs/snapshot/vnode", zfsctl_tops_snapshot, &zfsctl_ops_snapshot }, 105fa9e4066Sahrens { NULL } 106fa9e4066Sahrens }; 107fa9e4066Sahrens 108fa9e4066Sahrens typedef struct zfsctl_node { 109fa9e4066Sahrens gfs_dir_t zc_gfs_private; 110fa9e4066Sahrens uint64_t zc_id; 111a32fded1Sek timestruc_t zc_cmtime; /* ctime and mtime, always the same */ 112fa9e4066Sahrens } zfsctl_node_t; 113fa9e4066Sahrens 114fa9e4066Sahrens typedef struct zfsctl_snapdir { 115fa9e4066Sahrens zfsctl_node_t sd_node; 116fa9e4066Sahrens kmutex_t sd_lock; 117fa9e4066Sahrens avl_tree_t sd_snaps; 118fa9e4066Sahrens } zfsctl_snapdir_t; 119fa9e4066Sahrens 120fa9e4066Sahrens /* 121fa9e4066Sahrens * Root directory elements. We have only a single static entry, 'snapshot'. 122fa9e4066Sahrens */ 123fa9e4066Sahrens static gfs_dirent_t zfsctl_root_entries[] = { 124fa9e4066Sahrens { "snapshot", zfsctl_mknode_snapdir, GFS_CACHE_VNODE }, 125fa9e4066Sahrens { NULL } 126fa9e4066Sahrens }; 127fa9e4066Sahrens 128fa9e4066Sahrens /* include . and .. in the calculation */ 129fa9e4066Sahrens #define NROOT_ENTRIES ((sizeof (zfsctl_root_entries) / \ 130fa9e4066Sahrens sizeof (gfs_dirent_t)) + 1) 131fa9e4066Sahrens 132fa9e4066Sahrens 133fa9e4066Sahrens /* 134fa9e4066Sahrens * Initialize the various GFS pieces we'll need to create and manipulate .zfs 135fa9e4066Sahrens * directories. This is called from the ZFS init routine, and initializes the 136fa9e4066Sahrens * vnode ops vectors that we'll be using. 137fa9e4066Sahrens */ 138fa9e4066Sahrens void 139fa9e4066Sahrens zfsctl_init(void) 140fa9e4066Sahrens { 141fa9e4066Sahrens VERIFY(gfs_make_opsvec(zfsctl_opsvec) == 0); 142fa9e4066Sahrens } 143fa9e4066Sahrens 144fa9e4066Sahrens void 145fa9e4066Sahrens zfsctl_fini(void) 146fa9e4066Sahrens { 147fa9e4066Sahrens /* 148fa9e4066Sahrens * Remove vfsctl vnode ops 149fa9e4066Sahrens */ 150fa9e4066Sahrens if (zfsctl_ops_root) 151fa9e4066Sahrens vn_freevnodeops(zfsctl_ops_root); 152fa9e4066Sahrens if (zfsctl_ops_snapdir) 153fa9e4066Sahrens vn_freevnodeops(zfsctl_ops_snapdir); 154fa9e4066Sahrens if (zfsctl_ops_snapshot) 155fa9e4066Sahrens vn_freevnodeops(zfsctl_ops_snapshot); 156fa9e4066Sahrens 157fa9e4066Sahrens zfsctl_ops_root = NULL; 158fa9e4066Sahrens zfsctl_ops_snapdir = NULL; 159fa9e4066Sahrens zfsctl_ops_snapshot = NULL; 160fa9e4066Sahrens } 161fa9e4066Sahrens 162fa9e4066Sahrens /* 163fa9e4066Sahrens * Return the inode number associated with the 'snapshot' directory. 164fa9e4066Sahrens */ 165fa9e4066Sahrens /* ARGSUSED */ 166fa9e4066Sahrens static ino64_t 167fa9e4066Sahrens zfsctl_root_inode_cb(vnode_t *vp, int index) 168fa9e4066Sahrens { 169fa9e4066Sahrens ASSERT(index == 0); 170fa9e4066Sahrens return (ZFSCTL_INO_SNAPDIR); 171fa9e4066Sahrens } 172fa9e4066Sahrens 173fa9e4066Sahrens /* 174fa9e4066Sahrens * Create the '.zfs' directory. This directory is cached as part of the VFS 175fa9e4066Sahrens * structure. This results in a hold on the vfs_t. The code in zfs_umount() 176fa9e4066Sahrens * therefore checks against a vfs_count of 2 instead of 1. This reference 177fa9e4066Sahrens * is removed when the ctldir is destroyed in the unmount. 178fa9e4066Sahrens */ 179fa9e4066Sahrens void 180fa9e4066Sahrens zfsctl_create(zfsvfs_t *zfsvfs) 181fa9e4066Sahrens { 182a32fded1Sek vnode_t *vp, *rvp; 183fa9e4066Sahrens zfsctl_node_t *zcp; 184fa9e4066Sahrens 185fa9e4066Sahrens ASSERT(zfsvfs->z_ctldir == NULL); 186fa9e4066Sahrens 187fa9e4066Sahrens vp = gfs_root_create(sizeof (zfsctl_node_t), zfsvfs->z_vfs, 188fa9e4066Sahrens zfsctl_ops_root, ZFSCTL_INO_ROOT, zfsctl_root_entries, 189fa9e4066Sahrens zfsctl_root_inode_cb, MAXNAMELEN, NULL, NULL); 190fa9e4066Sahrens zcp = vp->v_data; 191fa9e4066Sahrens zcp->zc_id = ZFSCTL_INO_ROOT; 192fa9e4066Sahrens 193a32fded1Sek VERIFY(VFS_ROOT(zfsvfs->z_vfs, &rvp) == 0); 194a32fded1Sek ZFS_TIME_DECODE(&zcp->zc_cmtime, VTOZ(rvp)->z_phys->zp_crtime); 195a32fded1Sek VN_RELE(rvp); 196a32fded1Sek 197fa9e4066Sahrens /* 198fa9e4066Sahrens * We're only faking the fact that we have a root of a filesystem for 199fa9e4066Sahrens * the sake of the GFS interfaces. Undo the flag manipulation it did 200fa9e4066Sahrens * for us. 201fa9e4066Sahrens */ 202fa9e4066Sahrens vp->v_flag &= ~(VROOT | VNOCACHE | VNOMAP | VNOSWAP | VNOMOUNT); 203fa9e4066Sahrens 204fa9e4066Sahrens zfsvfs->z_ctldir = vp; 205fa9e4066Sahrens } 206fa9e4066Sahrens 207fa9e4066Sahrens /* 2088afd4dd6Sperrin * Destroy the '.zfs' directory. Only called when the filesystem is unmounted. 2098afd4dd6Sperrin * There might still be more references if we were force unmounted, but only 2108afd4dd6Sperrin * new zfs_inactive() calls can occur and they don't reference .zfs 211fa9e4066Sahrens */ 212fa9e4066Sahrens void 213fa9e4066Sahrens zfsctl_destroy(zfsvfs_t *zfsvfs) 214fa9e4066Sahrens { 215fa9e4066Sahrens VN_RELE(zfsvfs->z_ctldir); 216fa9e4066Sahrens zfsvfs->z_ctldir = NULL; 217fa9e4066Sahrens } 218fa9e4066Sahrens 219fa9e4066Sahrens /* 220fa9e4066Sahrens * Given a root znode, retrieve the associated .zfs directory. 221fa9e4066Sahrens * Add a hold to the vnode and return it. 222fa9e4066Sahrens */ 223fa9e4066Sahrens vnode_t * 224fa9e4066Sahrens zfsctl_root(znode_t *zp) 225fa9e4066Sahrens { 226fa9e4066Sahrens ASSERT(zfs_has_ctldir(zp)); 227fa9e4066Sahrens VN_HOLD(zp->z_zfsvfs->z_ctldir); 228fa9e4066Sahrens return (zp->z_zfsvfs->z_ctldir); 229fa9e4066Sahrens } 230fa9e4066Sahrens 231fa9e4066Sahrens /* 232fa9e4066Sahrens * Common open routine. Disallow any write access. 233fa9e4066Sahrens */ 234fa9e4066Sahrens /* ARGSUSED */ 235fa9e4066Sahrens static int 236fa9e4066Sahrens zfsctl_common_open(vnode_t **vpp, int flags, cred_t *cr) 237fa9e4066Sahrens { 238fa9e4066Sahrens if (flags & FWRITE) 239fa9e4066Sahrens return (EACCES); 240fa9e4066Sahrens 241fa9e4066Sahrens return (0); 242fa9e4066Sahrens } 243fa9e4066Sahrens 244fa9e4066Sahrens /* 245fa9e4066Sahrens * Common close routine. Nothing to do here. 246fa9e4066Sahrens */ 247fa9e4066Sahrens /* ARGSUSED */ 248fa9e4066Sahrens static int 249fa9e4066Sahrens zfsctl_common_close(vnode_t *vpp, int flags, int count, offset_t off, 250fa9e4066Sahrens cred_t *cr) 251fa9e4066Sahrens { 252fa9e4066Sahrens return (0); 253fa9e4066Sahrens } 254fa9e4066Sahrens 255fa9e4066Sahrens /* 256fa9e4066Sahrens * Common access routine. Disallow writes. 257fa9e4066Sahrens */ 258fa9e4066Sahrens /* ARGSUSED */ 259fa9e4066Sahrens static int 260fa9e4066Sahrens zfsctl_common_access(vnode_t *vp, int mode, int flags, cred_t *cr) 261fa9e4066Sahrens { 262fa9e4066Sahrens if (mode & VWRITE) 263fa9e4066Sahrens return (EACCES); 264fa9e4066Sahrens 265fa9e4066Sahrens return (0); 266fa9e4066Sahrens } 267fa9e4066Sahrens 268fa9e4066Sahrens /* 269fa9e4066Sahrens * Common getattr function. Fill in basic information. 270fa9e4066Sahrens */ 271fa9e4066Sahrens static void 272fa9e4066Sahrens zfsctl_common_getattr(vnode_t *vp, vattr_t *vap) 273fa9e4066Sahrens { 274a32fded1Sek zfsctl_node_t *zcp = vp->v_data; 275a32fded1Sek timestruc_t now; 276fa9e4066Sahrens 277fa9e4066Sahrens vap->va_uid = 0; 278fa9e4066Sahrens vap->va_gid = 0; 279fa9e4066Sahrens vap->va_rdev = 0; 280fa9e4066Sahrens /* 281fa9e4066Sahrens * We are a purly virtual object, so we have no 282fa9e4066Sahrens * blocksize or allocated blocks. 283fa9e4066Sahrens */ 284fa9e4066Sahrens vap->va_blksize = 0; 285fa9e4066Sahrens vap->va_nblocks = 0; 286fa9e4066Sahrens vap->va_seq = 0; 287fa9e4066Sahrens vap->va_fsid = vp->v_vfsp->vfs_dev; 288fa9e4066Sahrens vap->va_mode = S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP | 289fa9e4066Sahrens S_IROTH | S_IXOTH; 290fa9e4066Sahrens vap->va_type = VDIR; 291fa9e4066Sahrens /* 292a32fded1Sek * We live in the now (for atime). 293fa9e4066Sahrens */ 294fa9e4066Sahrens gethrestime(&now); 295a32fded1Sek vap->va_atime = now; 296a32fded1Sek vap->va_mtime = vap->va_ctime = zcp->zc_cmtime; 297fa9e4066Sahrens } 298fa9e4066Sahrens 299fa9e4066Sahrens static int 300fa9e4066Sahrens zfsctl_common_fid(vnode_t *vp, fid_t *fidp) 301fa9e4066Sahrens { 302fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 303fa9e4066Sahrens zfsctl_node_t *zcp = vp->v_data; 304fa9e4066Sahrens uint64_t object = zcp->zc_id; 305fa9e4066Sahrens zfid_short_t *zfid; 306fa9e4066Sahrens int i; 307fa9e4066Sahrens 308fa9e4066Sahrens ZFS_ENTER(zfsvfs); 309fa9e4066Sahrens 310fa9e4066Sahrens if (fidp->fid_len < SHORT_FID_LEN) { 311fa9e4066Sahrens fidp->fid_len = SHORT_FID_LEN; 3120f2dc02eSek ZFS_EXIT(zfsvfs); 313fa9e4066Sahrens return (ENOSPC); 314fa9e4066Sahrens } 315fa9e4066Sahrens 316fa9e4066Sahrens zfid = (zfid_short_t *)fidp; 317fa9e4066Sahrens 318fa9e4066Sahrens zfid->zf_len = SHORT_FID_LEN; 319fa9e4066Sahrens 320fa9e4066Sahrens for (i = 0; i < sizeof (zfid->zf_object); i++) 321fa9e4066Sahrens zfid->zf_object[i] = (uint8_t)(object >> (8 * i)); 322fa9e4066Sahrens 323fa9e4066Sahrens /* .zfs znodes always have a generation number of 0 */ 324fa9e4066Sahrens for (i = 0; i < sizeof (zfid->zf_gen); i++) 325fa9e4066Sahrens zfid->zf_gen[i] = 0; 326fa9e4066Sahrens 327fa9e4066Sahrens ZFS_EXIT(zfsvfs); 328fa9e4066Sahrens return (0); 329fa9e4066Sahrens } 330fa9e4066Sahrens 331fa9e4066Sahrens /* 332fa9e4066Sahrens * .zfs inode namespace 333fa9e4066Sahrens * 334fa9e4066Sahrens * We need to generate unique inode numbers for all files and directories 335fa9e4066Sahrens * within the .zfs pseudo-filesystem. We use the following scheme: 336fa9e4066Sahrens * 337fa9e4066Sahrens * ENTRY ZFSCTL_INODE 338fa9e4066Sahrens * .zfs 1 339fa9e4066Sahrens * .zfs/snapshot 2 340fa9e4066Sahrens * .zfs/snapshot/<snap> objectid(snap) 341fa9e4066Sahrens */ 342fa9e4066Sahrens 343fa9e4066Sahrens #define ZFSCTL_INO_SNAP(id) (id) 344fa9e4066Sahrens 345fa9e4066Sahrens /* 346fa9e4066Sahrens * Get root directory attributes. 347fa9e4066Sahrens */ 348fa9e4066Sahrens /* ARGSUSED */ 349fa9e4066Sahrens static int 350fa9e4066Sahrens zfsctl_root_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr) 351fa9e4066Sahrens { 352fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 353fa9e4066Sahrens 354fa9e4066Sahrens ZFS_ENTER(zfsvfs); 355fa9e4066Sahrens vap->va_nodeid = ZFSCTL_INO_ROOT; 356fa9e4066Sahrens vap->va_nlink = vap->va_size = NROOT_ENTRIES; 357fa9e4066Sahrens 358fa9e4066Sahrens zfsctl_common_getattr(vp, vap); 359fa9e4066Sahrens ZFS_EXIT(zfsvfs); 360fa9e4066Sahrens 361fa9e4066Sahrens return (0); 362fa9e4066Sahrens } 363fa9e4066Sahrens 364fa9e4066Sahrens /* 365fa9e4066Sahrens * Special case the handling of "..". 366fa9e4066Sahrens */ 367fa9e4066Sahrens /* ARGSUSED */ 368fa9e4066Sahrens int 369fa9e4066Sahrens zfsctl_root_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, pathname_t *pnp, 370fa9e4066Sahrens int flags, vnode_t *rdir, cred_t *cr) 371fa9e4066Sahrens { 372fa9e4066Sahrens zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data; 373fa9e4066Sahrens int err; 374fa9e4066Sahrens 375fa9e4066Sahrens ZFS_ENTER(zfsvfs); 376fa9e4066Sahrens 377fa9e4066Sahrens if (strcmp(nm, "..") == 0) { 378fa9e4066Sahrens err = VFS_ROOT(dvp->v_vfsp, vpp); 379fa9e4066Sahrens } else { 380fa9e4066Sahrens err = gfs_dir_lookup(dvp, nm, vpp); 381fa9e4066Sahrens } 382fa9e4066Sahrens 383fa9e4066Sahrens ZFS_EXIT(zfsvfs); 384fa9e4066Sahrens 385fa9e4066Sahrens return (err); 386fa9e4066Sahrens } 387fa9e4066Sahrens 388fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_root[] = { 389aa59c4cbSrsb { VOPNAME_OPEN, { .vop_open = zfsctl_common_open } }, 390aa59c4cbSrsb { VOPNAME_CLOSE, { .vop_close = zfsctl_common_close } }, 391aa59c4cbSrsb { VOPNAME_IOCTL, { .error = fs_inval } }, 392aa59c4cbSrsb { VOPNAME_GETATTR, { .vop_getattr = zfsctl_root_getattr } }, 393aa59c4cbSrsb { VOPNAME_ACCESS, { .vop_access = zfsctl_common_access } }, 394aa59c4cbSrsb { VOPNAME_READDIR, { .vop_readdir = gfs_vop_readdir } }, 395aa59c4cbSrsb { VOPNAME_LOOKUP, { .vop_lookup = zfsctl_root_lookup } }, 396aa59c4cbSrsb { VOPNAME_SEEK, { .vop_seek = fs_seek } }, 397aa59c4cbSrsb { VOPNAME_INACTIVE, { .vop_inactive = gfs_vop_inactive } }, 398aa59c4cbSrsb { VOPNAME_FID, { .vop_fid = zfsctl_common_fid } }, 399fa9e4066Sahrens { NULL } 400fa9e4066Sahrens }; 401fa9e4066Sahrens 402fa9e4066Sahrens static int 403fa9e4066Sahrens zfsctl_snapshot_zname(vnode_t *vp, const char *name, int len, char *zname) 404fa9e4066Sahrens { 405fa9e4066Sahrens objset_t *os = ((zfsvfs_t *)((vp)->v_vfsp->vfs_data))->z_os; 406fa9e4066Sahrens 407fa9e4066Sahrens dmu_objset_name(os, zname); 4085422900bSmaybee if (strlen(zname) + 1 + strlen(name) >= len) 409fa9e4066Sahrens return (ENAMETOOLONG); 4105422900bSmaybee (void) strcat(zname, "@"); 411fa9e4066Sahrens (void) strcat(zname, name); 412fa9e4066Sahrens return (0); 413fa9e4066Sahrens } 414fa9e4066Sahrens 415*ecd6cf80Smarks int 416fa9e4066Sahrens zfsctl_unmount_snap(vnode_t *dvp, const char *name, int force, cred_t *cr) 417fa9e4066Sahrens { 418fa9e4066Sahrens zfsctl_snapdir_t *sdp = dvp->v_data; 419fa9e4066Sahrens zfs_snapentry_t search, *sep; 420fa9e4066Sahrens avl_index_t where; 421fa9e4066Sahrens int err; 422fa9e4066Sahrens 423fa9e4066Sahrens ASSERT(MUTEX_HELD(&sdp->sd_lock)); 424fa9e4066Sahrens 425fa9e4066Sahrens search.se_name = (char *)name; 426fa9e4066Sahrens if ((sep = avl_find(&sdp->sd_snaps, &search, &where)) == NULL) 427fa9e4066Sahrens return (ENOENT); 428fa9e4066Sahrens 429fa9e4066Sahrens ASSERT(vn_ismntpt(sep->se_root)); 430fa9e4066Sahrens 431fa9e4066Sahrens /* this will be dropped by dounmount() */ 432fa9e4066Sahrens if ((err = vn_vfswlock(sep->se_root)) != 0) 433fa9e4066Sahrens return (err); 434fa9e4066Sahrens 435fa9e4066Sahrens VN_HOLD(sep->se_root); 436bbf4a8dfSmaybee err = dounmount(vn_mountedvfs(sep->se_root), force, kcred); 437bbf4a8dfSmaybee if (err) { 438bbf4a8dfSmaybee VN_RELE(sep->se_root); 439fa9e4066Sahrens return (err); 440bbf4a8dfSmaybee } 441fa9e4066Sahrens ASSERT(sep->se_root->v_count == 1); 442fa9e4066Sahrens gfs_vop_inactive(sep->se_root, cr); 443fa9e4066Sahrens 444fa9e4066Sahrens avl_remove(&sdp->sd_snaps, sep); 445fa9e4066Sahrens kmem_free(sep->se_name, strlen(sep->se_name) + 1); 446fa9e4066Sahrens kmem_free(sep, sizeof (zfs_snapentry_t)); 447fa9e4066Sahrens 448fa9e4066Sahrens return (0); 449fa9e4066Sahrens } 450fa9e4066Sahrens 451fa9e4066Sahrens 4525422900bSmaybee static void 453fa9e4066Sahrens zfsctl_rename_snap(zfsctl_snapdir_t *sdp, zfs_snapentry_t *sep, const char *nm) 454fa9e4066Sahrens { 455fa9e4066Sahrens avl_index_t where; 456fa9e4066Sahrens vfs_t *vfsp; 457fa9e4066Sahrens refstr_t *pathref; 458fa9e4066Sahrens char newpath[MAXNAMELEN]; 459fa9e4066Sahrens char *tail; 460fa9e4066Sahrens 461fa9e4066Sahrens ASSERT(MUTEX_HELD(&sdp->sd_lock)); 462fa9e4066Sahrens ASSERT(sep != NULL); 463fa9e4066Sahrens 464fa9e4066Sahrens vfsp = vn_mountedvfs(sep->se_root); 465fa9e4066Sahrens ASSERT(vfsp != NULL); 466fa9e4066Sahrens 4675422900bSmaybee vfs_lock_wait(vfsp); 468fa9e4066Sahrens 469fa9e4066Sahrens /* 470fa9e4066Sahrens * Change the name in the AVL tree. 471fa9e4066Sahrens */ 472fa9e4066Sahrens avl_remove(&sdp->sd_snaps, sep); 473fa9e4066Sahrens kmem_free(sep->se_name, strlen(sep->se_name) + 1); 474fa9e4066Sahrens sep->se_name = kmem_alloc(strlen(nm) + 1, KM_SLEEP); 475fa9e4066Sahrens (void) strcpy(sep->se_name, nm); 476fa9e4066Sahrens VERIFY(avl_find(&sdp->sd_snaps, sep, &where) == NULL); 477fa9e4066Sahrens avl_insert(&sdp->sd_snaps, sep, where); 478fa9e4066Sahrens 479fa9e4066Sahrens /* 480fa9e4066Sahrens * Change the current mountpoint info: 481fa9e4066Sahrens * - update the tail of the mntpoint path 482fa9e4066Sahrens * - update the tail of the resource path 483fa9e4066Sahrens */ 484fa9e4066Sahrens pathref = vfs_getmntpoint(vfsp); 4850b69c2f0Sahrens (void) strncpy(newpath, refstr_value(pathref), sizeof (newpath)); 4860b69c2f0Sahrens VERIFY((tail = strrchr(newpath, '/')) != NULL); 4870b69c2f0Sahrens *(tail+1) = '\0'; 4880b69c2f0Sahrens ASSERT3U(strlen(newpath) + strlen(nm), <, sizeof (newpath)); 489fa9e4066Sahrens (void) strcat(newpath, nm); 490fa9e4066Sahrens refstr_rele(pathref); 491fa9e4066Sahrens vfs_setmntpoint(vfsp, newpath); 492fa9e4066Sahrens 493fa9e4066Sahrens pathref = vfs_getresource(vfsp); 4940b69c2f0Sahrens (void) strncpy(newpath, refstr_value(pathref), sizeof (newpath)); 4950b69c2f0Sahrens VERIFY((tail = strrchr(newpath, '@')) != NULL); 4960b69c2f0Sahrens *(tail+1) = '\0'; 4970b69c2f0Sahrens ASSERT3U(strlen(newpath) + strlen(nm), <, sizeof (newpath)); 498fa9e4066Sahrens (void) strcat(newpath, nm); 499fa9e4066Sahrens refstr_rele(pathref); 500fa9e4066Sahrens vfs_setresource(vfsp, newpath); 501fa9e4066Sahrens 502fa9e4066Sahrens vfs_unlock(vfsp); 503fa9e4066Sahrens } 504fa9e4066Sahrens 505fa9e4066Sahrens static int 506fa9e4066Sahrens zfsctl_snapdir_rename(vnode_t *sdvp, char *snm, vnode_t *tdvp, char *tnm, 507fa9e4066Sahrens cred_t *cr) 508fa9e4066Sahrens { 509fa9e4066Sahrens zfsctl_snapdir_t *sdp = sdvp->v_data; 510fa9e4066Sahrens zfs_snapentry_t search, *sep; 511fa9e4066Sahrens avl_index_t where; 512fa9e4066Sahrens char from[MAXNAMELEN], to[MAXNAMELEN]; 513fa9e4066Sahrens int err; 514fa9e4066Sahrens 5155422900bSmaybee err = zfsctl_snapshot_zname(sdvp, snm, MAXNAMELEN, from); 5165422900bSmaybee if (err) 5175422900bSmaybee return (err); 518*ecd6cf80Smarks 519*ecd6cf80Smarks err = zfsctl_snapshot_zname(tdvp, tnm, MAXNAMELEN, to); 520fa9e4066Sahrens if (err) 521fa9e4066Sahrens return (err); 522fa9e4066Sahrens 523*ecd6cf80Smarks if (err = zfs_secpolicy_rename_perms(from, to, cr)) 524*ecd6cf80Smarks return (err); 525fa9e4066Sahrens /* 526fa9e4066Sahrens * Cannot move snapshots out of the snapdir. 527fa9e4066Sahrens */ 528fa9e4066Sahrens if (sdvp != tdvp) 529fa9e4066Sahrens return (EINVAL); 530fa9e4066Sahrens 531fa9e4066Sahrens if (strcmp(snm, tnm) == 0) 532fa9e4066Sahrens return (0); 533fa9e4066Sahrens 534fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 535fa9e4066Sahrens 536fa9e4066Sahrens search.se_name = (char *)snm; 5375422900bSmaybee if ((sep = avl_find(&sdp->sd_snaps, &search, &where)) == NULL) { 5385422900bSmaybee mutex_exit(&sdp->sd_lock); 5395422900bSmaybee return (ENOENT); 540fa9e4066Sahrens } 541fa9e4066Sahrens 542cdf5b4caSmmusante err = dmu_objset_rename(from, to, B_FALSE); 5435422900bSmaybee if (err == 0) 5445422900bSmaybee zfsctl_rename_snap(sdp, sep, tnm); 545fa9e4066Sahrens 546fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 547fa9e4066Sahrens 548fa9e4066Sahrens return (err); 549fa9e4066Sahrens } 550fa9e4066Sahrens 551fa9e4066Sahrens /* ARGSUSED */ 552fa9e4066Sahrens static int 553fa9e4066Sahrens zfsctl_snapdir_remove(vnode_t *dvp, char *name, vnode_t *cwd, cred_t *cr) 554fa9e4066Sahrens { 555fa9e4066Sahrens zfsctl_snapdir_t *sdp = dvp->v_data; 556fa9e4066Sahrens char snapname[MAXNAMELEN]; 557fa9e4066Sahrens int err; 558fa9e4066Sahrens 5595422900bSmaybee err = zfsctl_snapshot_zname(dvp, name, MAXNAMELEN, snapname); 5605422900bSmaybee if (err) 5615422900bSmaybee return (err); 562*ecd6cf80Smarks 563*ecd6cf80Smarks if (err = zfs_secpolicy_destroy_perms(snapname, cr)) 564fa9e4066Sahrens return (err); 565fa9e4066Sahrens 566fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 567fa9e4066Sahrens 568*ecd6cf80Smarks err = zfsctl_unmount_snap(dvp, name, MS_FORCE, cr); 569fa9e4066Sahrens if (err) { 570fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 571fa9e4066Sahrens return (err); 572fa9e4066Sahrens } 573fa9e4066Sahrens 574fa9e4066Sahrens err = dmu_objset_destroy(snapname); 575fa9e4066Sahrens 576fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 577fa9e4066Sahrens 578fa9e4066Sahrens return (err); 579fa9e4066Sahrens } 580fa9e4066Sahrens 581*ecd6cf80Smarks /* ARGSUSED */ 582*ecd6cf80Smarks static int 583*ecd6cf80Smarks zfsctl_snapdir_mkdir(vnode_t *dvp, char *dirname, vattr_t *vap, vnode_t **vpp, 584*ecd6cf80Smarks cred_t *cr) 585*ecd6cf80Smarks { 586*ecd6cf80Smarks zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data; 587*ecd6cf80Smarks char name[MAXNAMELEN]; 588*ecd6cf80Smarks int err; 589*ecd6cf80Smarks static enum symfollow follow = NO_FOLLOW; 590*ecd6cf80Smarks static enum uio_seg seg = UIO_SYSSPACE; 591*ecd6cf80Smarks 592*ecd6cf80Smarks dmu_objset_name(zfsvfs->z_os, name); 593*ecd6cf80Smarks 594*ecd6cf80Smarks *vpp = NULL; 595*ecd6cf80Smarks 596*ecd6cf80Smarks err = zfs_secpolicy_snapshot_perms(name, cr); 597*ecd6cf80Smarks if (err) 598*ecd6cf80Smarks return (err); 599*ecd6cf80Smarks 600*ecd6cf80Smarks if (err == 0) { 601*ecd6cf80Smarks err = dmu_objset_snapshot(name, dirname, B_FALSE); 602*ecd6cf80Smarks if (err) 603*ecd6cf80Smarks return (err); 604*ecd6cf80Smarks err = lookupnameat(dirname, seg, follow, NULL, vpp, dvp); 605*ecd6cf80Smarks } 606*ecd6cf80Smarks 607*ecd6cf80Smarks return (err); 608*ecd6cf80Smarks } 609*ecd6cf80Smarks 610fa9e4066Sahrens /* 611fa9e4066Sahrens * Lookup entry point for the 'snapshot' directory. Try to open the 612fa9e4066Sahrens * snapshot if it exist, creating the pseudo filesystem vnode as necessary. 613fa9e4066Sahrens * Perform a mount of the associated dataset on top of the vnode. 614fa9e4066Sahrens */ 615fa9e4066Sahrens /* ARGSUSED */ 616fa9e4066Sahrens static int 617fa9e4066Sahrens zfsctl_snapdir_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, pathname_t *pnp, 618fa9e4066Sahrens int flags, vnode_t *rdir, cred_t *cr) 619fa9e4066Sahrens { 620fa9e4066Sahrens zfsctl_snapdir_t *sdp = dvp->v_data; 621fa9e4066Sahrens objset_t *snap; 622fa9e4066Sahrens char snapname[MAXNAMELEN]; 623fa9e4066Sahrens char *mountpoint; 624fa9e4066Sahrens zfs_snapentry_t *sep, search; 625fa9e4066Sahrens struct mounta margs; 626fa9e4066Sahrens vfs_t *vfsp; 627fa9e4066Sahrens size_t mountpoint_len; 628fa9e4066Sahrens avl_index_t where; 629fa9e4066Sahrens zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data; 630fa9e4066Sahrens int err; 631fa9e4066Sahrens 632fa9e4066Sahrens ASSERT(dvp->v_type == VDIR); 633fa9e4066Sahrens 634fa9e4066Sahrens if (gfs_lookup_dot(vpp, dvp, zfsvfs->z_ctldir, nm) == 0) 635fa9e4066Sahrens return (0); 636fa9e4066Sahrens 637fa9e4066Sahrens /* 638fa9e4066Sahrens * If we get a recursive call, that means we got called 639fa9e4066Sahrens * from the domount() code while it was trying to look up the 640fa9e4066Sahrens * spec (which looks like a local path for zfs). We need to 641fa9e4066Sahrens * add some flag to domount() to tell it not to do this lookup. 642fa9e4066Sahrens */ 643fa9e4066Sahrens if (MUTEX_HELD(&sdp->sd_lock)) 644fa9e4066Sahrens return (ENOENT); 645fa9e4066Sahrens 646fa9e4066Sahrens ZFS_ENTER(zfsvfs); 647fa9e4066Sahrens 648fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 649fa9e4066Sahrens search.se_name = (char *)nm; 650fa9e4066Sahrens if ((sep = avl_find(&sdp->sd_snaps, &search, &where)) != NULL) { 651fa9e4066Sahrens *vpp = sep->se_root; 652fa9e4066Sahrens VN_HOLD(*vpp); 653bbf4a8dfSmaybee err = traverse(vpp); 654bbf4a8dfSmaybee if (err) { 655bbf4a8dfSmaybee VN_RELE(*vpp); 656bbf4a8dfSmaybee *vpp = NULL; 657bbf4a8dfSmaybee } else if (*vpp == sep->se_root) { 658bbf4a8dfSmaybee /* 659bbf4a8dfSmaybee * The snapshot was unmounted behind our backs, 660bbf4a8dfSmaybee * try to remount it. 661bbf4a8dfSmaybee */ 662fa9e4066Sahrens goto domount; 663bb963f1cSmaybee } 664fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 665fa9e4066Sahrens ZFS_EXIT(zfsvfs); 666bbf4a8dfSmaybee return (err); 667fa9e4066Sahrens } 668fa9e4066Sahrens 669fa9e4066Sahrens /* 670fa9e4066Sahrens * The requested snapshot is not currently mounted, look it up. 671fa9e4066Sahrens */ 6725422900bSmaybee err = zfsctl_snapshot_zname(dvp, nm, MAXNAMELEN, snapname); 6735422900bSmaybee if (err) { 6745422900bSmaybee mutex_exit(&sdp->sd_lock); 6755422900bSmaybee ZFS_EXIT(zfsvfs); 6765422900bSmaybee return (err); 6775422900bSmaybee } 678fa9e4066Sahrens if (dmu_objset_open(snapname, DMU_OST_ZFS, 679fa9e4066Sahrens DS_MODE_STANDARD | DS_MODE_READONLY, &snap) != 0) { 680fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 681fa9e4066Sahrens ZFS_EXIT(zfsvfs); 682fa9e4066Sahrens return (ENOENT); 683fa9e4066Sahrens } 684fa9e4066Sahrens 685fa9e4066Sahrens sep = kmem_alloc(sizeof (zfs_snapentry_t), KM_SLEEP); 686fa9e4066Sahrens sep->se_name = kmem_alloc(strlen(nm) + 1, KM_SLEEP); 687fa9e4066Sahrens (void) strcpy(sep->se_name, nm); 688fa9e4066Sahrens *vpp = sep->se_root = zfsctl_snapshot_mknode(dvp, dmu_objset_id(snap)); 689fa9e4066Sahrens avl_insert(&sdp->sd_snaps, sep, where); 690fa9e4066Sahrens 691fa9e4066Sahrens dmu_objset_close(snap); 692fa9e4066Sahrens domount: 693fa9e4066Sahrens mountpoint_len = strlen(refstr_value(dvp->v_vfsp->vfs_mntpt)) + 694fa9e4066Sahrens strlen("/.zfs/snapshot/") + strlen(nm) + 1; 695fa9e4066Sahrens mountpoint = kmem_alloc(mountpoint_len, KM_SLEEP); 696fa9e4066Sahrens (void) snprintf(mountpoint, mountpoint_len, "%s/.zfs/snapshot/%s", 697fa9e4066Sahrens refstr_value(dvp->v_vfsp->vfs_mntpt), nm); 698fa9e4066Sahrens 699fa9e4066Sahrens margs.spec = snapname; 700fa9e4066Sahrens margs.dir = mountpoint; 701fa9e4066Sahrens margs.flags = MS_SYSSPACE | MS_NOMNTTAB; 702fa9e4066Sahrens margs.fstype = "zfs"; 703fa9e4066Sahrens margs.dataptr = NULL; 704fa9e4066Sahrens margs.datalen = 0; 705fa9e4066Sahrens margs.optptr = NULL; 706fa9e4066Sahrens margs.optlen = 0; 707fa9e4066Sahrens 708fa9e4066Sahrens err = domount("zfs", &margs, *vpp, kcred, &vfsp); 709fa9e4066Sahrens kmem_free(mountpoint, mountpoint_len); 710fa9e4066Sahrens 71195c9592aSmaybee if (err == 0) { 71295c9592aSmaybee /* 71395c9592aSmaybee * Return the mounted root rather than the covered mount point. 71495c9592aSmaybee */ 71595c9592aSmaybee VFS_RELE(vfsp); 71695c9592aSmaybee err = traverse(vpp); 71795c9592aSmaybee } 718fa9e4066Sahrens 71995c9592aSmaybee if (err == 0) { 72095c9592aSmaybee /* 72195c9592aSmaybee * Fix up the root vnode. 72295c9592aSmaybee */ 72395c9592aSmaybee ASSERT(VTOZ(*vpp)->z_zfsvfs != zfsvfs); 72495c9592aSmaybee VTOZ(*vpp)->z_zfsvfs->z_parent = zfsvfs; 72595c9592aSmaybee (*vpp)->v_vfsp = zfsvfs->z_vfs; 72695c9592aSmaybee (*vpp)->v_flag &= ~VROOT; 72795c9592aSmaybee } 728fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 729fa9e4066Sahrens ZFS_EXIT(zfsvfs); 730fa9e4066Sahrens 731bb963f1cSmaybee /* 732bb963f1cSmaybee * If we had an error, drop our hold on the vnode and 733bb963f1cSmaybee * zfsctl_snapshot_inactive() will clean up. 734bb963f1cSmaybee */ 735bb963f1cSmaybee if (err) { 73695c9592aSmaybee VN_RELE(*vpp); 737bb963f1cSmaybee *vpp = NULL; 738bb963f1cSmaybee } 73995c9592aSmaybee return (err); 740fa9e4066Sahrens } 741fa9e4066Sahrens 742fa9e4066Sahrens /* ARGSUSED */ 743fa9e4066Sahrens static int 744fa9e4066Sahrens zfsctl_snapdir_readdir_cb(vnode_t *vp, struct dirent64 *dp, int *eofp, 745fa9e4066Sahrens offset_t *offp, offset_t *nextp, void *data) 746fa9e4066Sahrens { 747fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 748fa9e4066Sahrens char snapname[MAXNAMELEN]; 749fa9e4066Sahrens uint64_t id, cookie; 750fa9e4066Sahrens 751fa9e4066Sahrens ZFS_ENTER(zfsvfs); 752fa9e4066Sahrens 753fa9e4066Sahrens cookie = *offp; 754fa9e4066Sahrens if (dmu_snapshot_list_next(zfsvfs->z_os, MAXNAMELEN, snapname, &id, 755fa9e4066Sahrens &cookie) == ENOENT) { 756fa9e4066Sahrens *eofp = 1; 757fa9e4066Sahrens ZFS_EXIT(zfsvfs); 758fa9e4066Sahrens return (0); 759fa9e4066Sahrens } 760fa9e4066Sahrens 761fa9e4066Sahrens (void) strcpy(dp->d_name, snapname); 762fa9e4066Sahrens dp->d_ino = ZFSCTL_INO_SNAP(id); 763fa9e4066Sahrens *nextp = cookie; 764fa9e4066Sahrens 765fa9e4066Sahrens ZFS_EXIT(zfsvfs); 766fa9e4066Sahrens 767fa9e4066Sahrens return (0); 768fa9e4066Sahrens } 769fa9e4066Sahrens 770fa9e4066Sahrens vnode_t * 771fa9e4066Sahrens zfsctl_mknode_snapdir(vnode_t *pvp) 772fa9e4066Sahrens { 773fa9e4066Sahrens vnode_t *vp; 774fa9e4066Sahrens zfsctl_snapdir_t *sdp; 775fa9e4066Sahrens 776fa9e4066Sahrens vp = gfs_dir_create(sizeof (zfsctl_snapdir_t), pvp, 777fa9e4066Sahrens zfsctl_ops_snapdir, NULL, NULL, MAXNAMELEN, 778fa9e4066Sahrens zfsctl_snapdir_readdir_cb, NULL); 779fa9e4066Sahrens sdp = vp->v_data; 780fa9e4066Sahrens sdp->sd_node.zc_id = ZFSCTL_INO_SNAPDIR; 781a32fded1Sek sdp->sd_node.zc_cmtime = ((zfsctl_node_t *)pvp->v_data)->zc_cmtime; 782fa9e4066Sahrens mutex_init(&sdp->sd_lock, NULL, MUTEX_DEFAULT, NULL); 783fa9e4066Sahrens avl_create(&sdp->sd_snaps, snapentry_compare, 784fa9e4066Sahrens sizeof (zfs_snapentry_t), offsetof(zfs_snapentry_t, se_node)); 785fa9e4066Sahrens return (vp); 786fa9e4066Sahrens } 787fa9e4066Sahrens 788fa9e4066Sahrens /* ARGSUSED */ 789fa9e4066Sahrens static int 790fa9e4066Sahrens zfsctl_snapdir_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr) 791fa9e4066Sahrens { 792fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 793fa9e4066Sahrens zfsctl_snapdir_t *sdp = vp->v_data; 794fa9e4066Sahrens 795fa9e4066Sahrens ZFS_ENTER(zfsvfs); 796fa9e4066Sahrens zfsctl_common_getattr(vp, vap); 797fa9e4066Sahrens vap->va_nodeid = gfs_file_inode(vp); 798fa9e4066Sahrens vap->va_nlink = vap->va_size = avl_numnodes(&sdp->sd_snaps) + 2; 799fa9e4066Sahrens ZFS_EXIT(zfsvfs); 800fa9e4066Sahrens 801fa9e4066Sahrens return (0); 802fa9e4066Sahrens } 803fa9e4066Sahrens 804bb963f1cSmaybee /* ARGSUSED */ 805fa9e4066Sahrens static void 806fa9e4066Sahrens zfsctl_snapdir_inactive(vnode_t *vp, cred_t *cr) 807fa9e4066Sahrens { 808fa9e4066Sahrens zfsctl_snapdir_t *sdp = vp->v_data; 809bb963f1cSmaybee void *private; 810bb963f1cSmaybee 811bb963f1cSmaybee private = gfs_dir_inactive(vp); 812bb963f1cSmaybee if (private != NULL) { 813bb963f1cSmaybee ASSERT(avl_numnodes(&sdp->sd_snaps) == 0); 814bb963f1cSmaybee mutex_destroy(&sdp->sd_lock); 815bb963f1cSmaybee avl_destroy(&sdp->sd_snaps); 816bb963f1cSmaybee kmem_free(private, sizeof (zfsctl_snapdir_t)); 817bb963f1cSmaybee } 818fa9e4066Sahrens } 819fa9e4066Sahrens 820fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapdir[] = { 821aa59c4cbSrsb { VOPNAME_OPEN, { .vop_open = zfsctl_common_open } }, 822aa59c4cbSrsb { VOPNAME_CLOSE, { .vop_close = zfsctl_common_close } }, 823aa59c4cbSrsb { VOPNAME_IOCTL, { .error = fs_inval } }, 824aa59c4cbSrsb { VOPNAME_GETATTR, { .vop_getattr = zfsctl_snapdir_getattr } }, 825aa59c4cbSrsb { VOPNAME_ACCESS, { .vop_access = zfsctl_common_access } }, 826aa59c4cbSrsb { VOPNAME_RENAME, { .vop_rename = zfsctl_snapdir_rename } }, 827aa59c4cbSrsb { VOPNAME_RMDIR, { .vop_rmdir = zfsctl_snapdir_remove } }, 828*ecd6cf80Smarks { VOPNAME_MKDIR, { .vop_mkdir = zfsctl_snapdir_mkdir } }, 829aa59c4cbSrsb { VOPNAME_READDIR, { .vop_readdir = gfs_vop_readdir } }, 830aa59c4cbSrsb { VOPNAME_LOOKUP, { .vop_lookup = zfsctl_snapdir_lookup } }, 831aa59c4cbSrsb { VOPNAME_SEEK, { .vop_seek = fs_seek } }, 832aa59c4cbSrsb { VOPNAME_INACTIVE, { .vop_inactive = zfsctl_snapdir_inactive } }, 833aa59c4cbSrsb { VOPNAME_FID, { .vop_fid = zfsctl_common_fid } }, 834fa9e4066Sahrens { NULL } 835fa9e4066Sahrens }; 836fa9e4066Sahrens 837fa9e4066Sahrens static vnode_t * 838fa9e4066Sahrens zfsctl_snapshot_mknode(vnode_t *pvp, uint64_t objset) 839fa9e4066Sahrens { 840fa9e4066Sahrens vnode_t *vp; 841fa9e4066Sahrens zfsctl_node_t *zcp; 842fa9e4066Sahrens 843fa9e4066Sahrens vp = gfs_dir_create(sizeof (zfsctl_node_t), pvp, 844fa9e4066Sahrens zfsctl_ops_snapshot, NULL, NULL, MAXNAMELEN, NULL, NULL); 845fa9e4066Sahrens zcp = vp->v_data; 846fa9e4066Sahrens zcp->zc_id = objset; 847fa9e4066Sahrens 848fa9e4066Sahrens return (vp); 849fa9e4066Sahrens } 850fa9e4066Sahrens 851fa9e4066Sahrens static void 852fa9e4066Sahrens zfsctl_snapshot_inactive(vnode_t *vp, cred_t *cr) 853fa9e4066Sahrens { 854fa9e4066Sahrens zfsctl_snapdir_t *sdp; 855fa9e4066Sahrens zfs_snapentry_t *sep, *next; 856fa9e4066Sahrens vnode_t *dvp; 857fa9e4066Sahrens 858fa9e4066Sahrens VERIFY(gfs_dir_lookup(vp, "..", &dvp) == 0); 859fa9e4066Sahrens sdp = dvp->v_data; 860fa9e4066Sahrens 861fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 862fa9e4066Sahrens 863fa9e4066Sahrens if (vp->v_count > 1) { 864fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 865fa9e4066Sahrens return; 866fa9e4066Sahrens } 867fa9e4066Sahrens ASSERT(!vn_ismntpt(vp)); 868fa9e4066Sahrens 869fa9e4066Sahrens sep = avl_first(&sdp->sd_snaps); 870fa9e4066Sahrens while (sep != NULL) { 871fa9e4066Sahrens next = AVL_NEXT(&sdp->sd_snaps, sep); 872fa9e4066Sahrens 873fa9e4066Sahrens if (sep->se_root == vp) { 874fa9e4066Sahrens avl_remove(&sdp->sd_snaps, sep); 875fa9e4066Sahrens kmem_free(sep->se_name, strlen(sep->se_name) + 1); 876fa9e4066Sahrens kmem_free(sep, sizeof (zfs_snapentry_t)); 877fa9e4066Sahrens break; 878fa9e4066Sahrens } 879fa9e4066Sahrens sep = next; 880fa9e4066Sahrens } 881fa9e4066Sahrens ASSERT(sep != NULL); 882fa9e4066Sahrens 883fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 884fa9e4066Sahrens VN_RELE(dvp); 885fa9e4066Sahrens 886bb963f1cSmaybee /* 887bb963f1cSmaybee * Dispose of the vnode for the snapshot mount point. 888bb963f1cSmaybee * This is safe to do because once this entry has been removed 889bb963f1cSmaybee * from the AVL tree, it can't be found again, so cannot become 890bb963f1cSmaybee * "active". If we lookup the same name again we will end up 891bb963f1cSmaybee * creating a new vnode. 892bb963f1cSmaybee */ 893fa9e4066Sahrens gfs_vop_inactive(vp, cr); 894fa9e4066Sahrens } 895fa9e4066Sahrens 896fa9e4066Sahrens 897fa9e4066Sahrens /* 898fa9e4066Sahrens * These VP's should never see the light of day. They should always 899fa9e4066Sahrens * be covered. 900fa9e4066Sahrens */ 901fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapshot[] = { 902aa59c4cbSrsb VOPNAME_INACTIVE, { .vop_inactive = zfsctl_snapshot_inactive }, 903fa9e4066Sahrens NULL, NULL 904fa9e4066Sahrens }; 905fa9e4066Sahrens 906fa9e4066Sahrens int 907fa9e4066Sahrens zfsctl_lookup_objset(vfs_t *vfsp, uint64_t objsetid, zfsvfs_t **zfsvfsp) 908fa9e4066Sahrens { 909fa9e4066Sahrens zfsvfs_t *zfsvfs = vfsp->vfs_data; 910fa9e4066Sahrens vnode_t *dvp, *vp; 911fa9e4066Sahrens zfsctl_snapdir_t *sdp; 912fa9e4066Sahrens zfsctl_node_t *zcp; 913fa9e4066Sahrens zfs_snapentry_t *sep; 914fa9e4066Sahrens int error; 915fa9e4066Sahrens 916fa9e4066Sahrens ASSERT(zfsvfs->z_ctldir != NULL); 917fa9e4066Sahrens error = zfsctl_root_lookup(zfsvfs->z_ctldir, "snapshot", &dvp, 918fa9e4066Sahrens NULL, 0, NULL, kcred); 919fa9e4066Sahrens if (error != 0) 920fa9e4066Sahrens return (error); 921fa9e4066Sahrens sdp = dvp->v_data; 922fa9e4066Sahrens 923fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 924fa9e4066Sahrens sep = avl_first(&sdp->sd_snaps); 925fa9e4066Sahrens while (sep != NULL) { 926fa9e4066Sahrens vp = sep->se_root; 927fa9e4066Sahrens zcp = vp->v_data; 928fa9e4066Sahrens if (zcp->zc_id == objsetid) 929fa9e4066Sahrens break; 930fa9e4066Sahrens 931fa9e4066Sahrens sep = AVL_NEXT(&sdp->sd_snaps, sep); 932fa9e4066Sahrens } 933fa9e4066Sahrens 934fa9e4066Sahrens if (sep != NULL) { 935fa9e4066Sahrens VN_HOLD(vp); 936fa9e4066Sahrens error = traverse(&vp); 937bbf4a8dfSmaybee if (error == 0) { 938bbf4a8dfSmaybee if (vp == sep->se_root) 939bbf4a8dfSmaybee error = EINVAL; 940bbf4a8dfSmaybee else 941bbf4a8dfSmaybee *zfsvfsp = VTOZ(vp)->z_zfsvfs; 942bbf4a8dfSmaybee } 943fea70b54Snd mutex_exit(&sdp->sd_lock); 944fa9e4066Sahrens VN_RELE(vp); 945fa9e4066Sahrens } else { 946fa9e4066Sahrens error = EINVAL; 947fea70b54Snd mutex_exit(&sdp->sd_lock); 948fa9e4066Sahrens } 949fa9e4066Sahrens 950fa9e4066Sahrens VN_RELE(dvp); 951fa9e4066Sahrens 952fa9e4066Sahrens return (error); 953fa9e4066Sahrens } 954fa9e4066Sahrens 955fa9e4066Sahrens /* 956fa9e4066Sahrens * Unmount any snapshots for the given filesystem. This is called from 957fa9e4066Sahrens * zfs_umount() - if we have a ctldir, then go through and unmount all the 958fa9e4066Sahrens * snapshots. 959fa9e4066Sahrens */ 960fa9e4066Sahrens int 961fa9e4066Sahrens zfsctl_umount_snapshots(vfs_t *vfsp, int fflags, cred_t *cr) 962fa9e4066Sahrens { 963fa9e4066Sahrens zfsvfs_t *zfsvfs = vfsp->vfs_data; 964fa9e4066Sahrens vnode_t *dvp, *svp; 965fa9e4066Sahrens zfsctl_snapdir_t *sdp; 966fa9e4066Sahrens zfs_snapentry_t *sep, *next; 967fa9e4066Sahrens int error; 968fa9e4066Sahrens 969fa9e4066Sahrens ASSERT(zfsvfs->z_ctldir != NULL); 970fa9e4066Sahrens error = zfsctl_root_lookup(zfsvfs->z_ctldir, "snapshot", &dvp, 971fa9e4066Sahrens NULL, 0, NULL, cr); 972fa9e4066Sahrens if (error != 0) 973fa9e4066Sahrens return (error); 974fa9e4066Sahrens sdp = dvp->v_data; 975fa9e4066Sahrens 976fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 977fa9e4066Sahrens 978fa9e4066Sahrens sep = avl_first(&sdp->sd_snaps); 979fa9e4066Sahrens while (sep != NULL) { 980fa9e4066Sahrens svp = sep->se_root; 981fa9e4066Sahrens next = AVL_NEXT(&sdp->sd_snaps, sep); 982fa9e4066Sahrens 983fa9e4066Sahrens /* 984fa9e4066Sahrens * If this snapshot is not mounted, then it must 985fa9e4066Sahrens * have just been unmounted by somebody else, and 986fa9e4066Sahrens * will be cleaned up by zfsctl_snapdir_inactive(). 987fa9e4066Sahrens */ 988fa9e4066Sahrens if (vn_ismntpt(svp)) { 989fa9e4066Sahrens if ((error = vn_vfswlock(svp)) != 0) 990fa9e4066Sahrens goto out; 991fa9e4066Sahrens 992fa9e4066Sahrens VN_HOLD(svp); 993fa9e4066Sahrens error = dounmount(vn_mountedvfs(svp), fflags, cr); 994fa9e4066Sahrens if (error) { 995fa9e4066Sahrens VN_RELE(svp); 996fa9e4066Sahrens goto out; 997fa9e4066Sahrens } 998fa9e4066Sahrens 999fa9e4066Sahrens avl_remove(&sdp->sd_snaps, sep); 1000fa9e4066Sahrens kmem_free(sep->se_name, strlen(sep->se_name) + 1); 1001fa9e4066Sahrens kmem_free(sep, sizeof (zfs_snapentry_t)); 1002fa9e4066Sahrens 1003fa9e4066Sahrens /* 1004fa9e4066Sahrens * We can't use VN_RELE(), as that will try to 1005fa9e4066Sahrens * invoke zfsctl_snapdir_inactive(), and that 1006fa9e4066Sahrens * would lead to an attempt to re-grab the sd_lock. 1007fa9e4066Sahrens */ 1008fa9e4066Sahrens ASSERT3U(svp->v_count, ==, 1); 1009fa9e4066Sahrens gfs_vop_inactive(svp, cr); 1010fa9e4066Sahrens } 1011fa9e4066Sahrens sep = next; 1012fa9e4066Sahrens } 1013fa9e4066Sahrens out: 1014fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 1015fa9e4066Sahrens VN_RELE(dvp); 1016fa9e4066Sahrens 1017fa9e4066Sahrens return (error); 1018fa9e4066Sahrens } 1019