1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5*0f2dc02eSek * Common Development and Distribution License (the "License"). 6*0f2dc02eSek * 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 /* 228afd4dd6Sperrin * Copyright 2006 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> 62fa9e4066Sahrens #include <sys/gfs.h> 63fa9e4066Sahrens #include <sys/stat.h> 64fa9e4066Sahrens #include <sys/dmu.h> 65fa9e4066Sahrens #include <sys/mount.h> 66fa9e4066Sahrens 67fa9e4066Sahrens typedef struct { 68fa9e4066Sahrens char *se_name; 69fa9e4066Sahrens vnode_t *se_root; 70fa9e4066Sahrens avl_node_t se_node; 71fa9e4066Sahrens } zfs_snapentry_t; 72fa9e4066Sahrens 73fa9e4066Sahrens static int 74fa9e4066Sahrens snapentry_compare(const void *a, const void *b) 75fa9e4066Sahrens { 76fa9e4066Sahrens const zfs_snapentry_t *sa = a; 77fa9e4066Sahrens const zfs_snapentry_t *sb = b; 78fa9e4066Sahrens int ret = strcmp(sa->se_name, sb->se_name); 79fa9e4066Sahrens 80fa9e4066Sahrens if (ret < 0) 81fa9e4066Sahrens return (-1); 82fa9e4066Sahrens else if (ret > 0) 83fa9e4066Sahrens return (1); 84fa9e4066Sahrens else 85fa9e4066Sahrens return (0); 86fa9e4066Sahrens } 87fa9e4066Sahrens 88fa9e4066Sahrens vnodeops_t *zfsctl_ops_root; 89fa9e4066Sahrens vnodeops_t *zfsctl_ops_snapdir; 90fa9e4066Sahrens vnodeops_t *zfsctl_ops_snapshot; 91fa9e4066Sahrens 92fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_root[]; 93fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapdir[]; 94fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapshot[]; 95fa9e4066Sahrens 96fa9e4066Sahrens static vnode_t *zfsctl_mknode_snapdir(vnode_t *); 97fa9e4066Sahrens static vnode_t *zfsctl_snapshot_mknode(vnode_t *, uint64_t objset); 98fa9e4066Sahrens 99fa9e4066Sahrens static gfs_opsvec_t zfsctl_opsvec[] = { 100fa9e4066Sahrens { ".zfs", zfsctl_tops_root, &zfsctl_ops_root }, 101fa9e4066Sahrens { ".zfs/snapshot", zfsctl_tops_snapdir, &zfsctl_ops_snapdir }, 102fa9e4066Sahrens { ".zfs/snapshot/vnode", zfsctl_tops_snapshot, &zfsctl_ops_snapshot }, 103fa9e4066Sahrens { NULL } 104fa9e4066Sahrens }; 105fa9e4066Sahrens 106fa9e4066Sahrens typedef struct zfsctl_node { 107fa9e4066Sahrens gfs_dir_t zc_gfs_private; 108fa9e4066Sahrens uint64_t zc_id; 109fa9e4066Sahrens } zfsctl_node_t; 110fa9e4066Sahrens 111fa9e4066Sahrens typedef struct zfsctl_snapdir { 112fa9e4066Sahrens zfsctl_node_t sd_node; 113fa9e4066Sahrens kmutex_t sd_lock; 114fa9e4066Sahrens avl_tree_t sd_snaps; 115fa9e4066Sahrens } zfsctl_snapdir_t; 116fa9e4066Sahrens 117fa9e4066Sahrens /* 118fa9e4066Sahrens * Root directory elements. We have only a single static entry, 'snapshot'. 119fa9e4066Sahrens */ 120fa9e4066Sahrens static gfs_dirent_t zfsctl_root_entries[] = { 121fa9e4066Sahrens { "snapshot", zfsctl_mknode_snapdir, GFS_CACHE_VNODE }, 122fa9e4066Sahrens { NULL } 123fa9e4066Sahrens }; 124fa9e4066Sahrens 125fa9e4066Sahrens /* include . and .. in the calculation */ 126fa9e4066Sahrens #define NROOT_ENTRIES ((sizeof (zfsctl_root_entries) / \ 127fa9e4066Sahrens sizeof (gfs_dirent_t)) + 1) 128fa9e4066Sahrens 129fa9e4066Sahrens 130fa9e4066Sahrens /* 131fa9e4066Sahrens * Initialize the various GFS pieces we'll need to create and manipulate .zfs 132fa9e4066Sahrens * directories. This is called from the ZFS init routine, and initializes the 133fa9e4066Sahrens * vnode ops vectors that we'll be using. 134fa9e4066Sahrens */ 135fa9e4066Sahrens void 136fa9e4066Sahrens zfsctl_init(void) 137fa9e4066Sahrens { 138fa9e4066Sahrens VERIFY(gfs_make_opsvec(zfsctl_opsvec) == 0); 139fa9e4066Sahrens } 140fa9e4066Sahrens 141fa9e4066Sahrens void 142fa9e4066Sahrens zfsctl_fini(void) 143fa9e4066Sahrens { 144fa9e4066Sahrens /* 145fa9e4066Sahrens * Remove vfsctl vnode ops 146fa9e4066Sahrens */ 147fa9e4066Sahrens if (zfsctl_ops_root) 148fa9e4066Sahrens vn_freevnodeops(zfsctl_ops_root); 149fa9e4066Sahrens if (zfsctl_ops_snapdir) 150fa9e4066Sahrens vn_freevnodeops(zfsctl_ops_snapdir); 151fa9e4066Sahrens if (zfsctl_ops_snapshot) 152fa9e4066Sahrens vn_freevnodeops(zfsctl_ops_snapshot); 153fa9e4066Sahrens 154fa9e4066Sahrens zfsctl_ops_root = NULL; 155fa9e4066Sahrens zfsctl_ops_snapdir = NULL; 156fa9e4066Sahrens zfsctl_ops_snapshot = NULL; 157fa9e4066Sahrens } 158fa9e4066Sahrens 159fa9e4066Sahrens /* 160fa9e4066Sahrens * Return the inode number associated with the 'snapshot' directory. 161fa9e4066Sahrens */ 162fa9e4066Sahrens /* ARGSUSED */ 163fa9e4066Sahrens static ino64_t 164fa9e4066Sahrens zfsctl_root_inode_cb(vnode_t *vp, int index) 165fa9e4066Sahrens { 166fa9e4066Sahrens ASSERT(index == 0); 167fa9e4066Sahrens return (ZFSCTL_INO_SNAPDIR); 168fa9e4066Sahrens } 169fa9e4066Sahrens 170fa9e4066Sahrens /* 171fa9e4066Sahrens * Create the '.zfs' directory. This directory is cached as part of the VFS 172fa9e4066Sahrens * structure. This results in a hold on the vfs_t. The code in zfs_umount() 173fa9e4066Sahrens * therefore checks against a vfs_count of 2 instead of 1. This reference 174fa9e4066Sahrens * is removed when the ctldir is destroyed in the unmount. 175fa9e4066Sahrens */ 176fa9e4066Sahrens void 177fa9e4066Sahrens zfsctl_create(zfsvfs_t *zfsvfs) 178fa9e4066Sahrens { 179fa9e4066Sahrens vnode_t *vp; 180fa9e4066Sahrens zfsctl_node_t *zcp; 181fa9e4066Sahrens 182fa9e4066Sahrens ASSERT(zfsvfs->z_ctldir == NULL); 183fa9e4066Sahrens 184fa9e4066Sahrens vp = gfs_root_create(sizeof (zfsctl_node_t), zfsvfs->z_vfs, 185fa9e4066Sahrens zfsctl_ops_root, ZFSCTL_INO_ROOT, zfsctl_root_entries, 186fa9e4066Sahrens zfsctl_root_inode_cb, MAXNAMELEN, NULL, NULL); 187fa9e4066Sahrens zcp = vp->v_data; 188fa9e4066Sahrens zcp->zc_id = ZFSCTL_INO_ROOT; 189fa9e4066Sahrens 190fa9e4066Sahrens /* 191fa9e4066Sahrens * We're only faking the fact that we have a root of a filesystem for 192fa9e4066Sahrens * the sake of the GFS interfaces. Undo the flag manipulation it did 193fa9e4066Sahrens * for us. 194fa9e4066Sahrens */ 195fa9e4066Sahrens vp->v_flag &= ~(VROOT | VNOCACHE | VNOMAP | VNOSWAP | VNOMOUNT); 196fa9e4066Sahrens 197fa9e4066Sahrens zfsvfs->z_ctldir = vp; 198fa9e4066Sahrens } 199fa9e4066Sahrens 200fa9e4066Sahrens /* 2018afd4dd6Sperrin * Destroy the '.zfs' directory. Only called when the filesystem is unmounted. 2028afd4dd6Sperrin * There might still be more references if we were force unmounted, but only 2038afd4dd6Sperrin * new zfs_inactive() calls can occur and they don't reference .zfs 204fa9e4066Sahrens */ 205fa9e4066Sahrens void 206fa9e4066Sahrens zfsctl_destroy(zfsvfs_t *zfsvfs) 207fa9e4066Sahrens { 208fa9e4066Sahrens VN_RELE(zfsvfs->z_ctldir); 209fa9e4066Sahrens zfsvfs->z_ctldir = NULL; 210fa9e4066Sahrens } 211fa9e4066Sahrens 212fa9e4066Sahrens /* 213fa9e4066Sahrens * Given a root znode, retrieve the associated .zfs directory. 214fa9e4066Sahrens * Add a hold to the vnode and return it. 215fa9e4066Sahrens */ 216fa9e4066Sahrens vnode_t * 217fa9e4066Sahrens zfsctl_root(znode_t *zp) 218fa9e4066Sahrens { 219fa9e4066Sahrens ASSERT(zfs_has_ctldir(zp)); 220fa9e4066Sahrens VN_HOLD(zp->z_zfsvfs->z_ctldir); 221fa9e4066Sahrens return (zp->z_zfsvfs->z_ctldir); 222fa9e4066Sahrens } 223fa9e4066Sahrens 224fa9e4066Sahrens /* 225fa9e4066Sahrens * Common open routine. Disallow any write access. 226fa9e4066Sahrens */ 227fa9e4066Sahrens /* ARGSUSED */ 228fa9e4066Sahrens static int 229fa9e4066Sahrens zfsctl_common_open(vnode_t **vpp, int flags, cred_t *cr) 230fa9e4066Sahrens { 231fa9e4066Sahrens if (flags & FWRITE) 232fa9e4066Sahrens return (EACCES); 233fa9e4066Sahrens 234fa9e4066Sahrens return (0); 235fa9e4066Sahrens } 236fa9e4066Sahrens 237fa9e4066Sahrens /* 238fa9e4066Sahrens * Common close routine. Nothing to do here. 239fa9e4066Sahrens */ 240fa9e4066Sahrens /* ARGSUSED */ 241fa9e4066Sahrens static int 242fa9e4066Sahrens zfsctl_common_close(vnode_t *vpp, int flags, int count, offset_t off, 243fa9e4066Sahrens cred_t *cr) 244fa9e4066Sahrens { 245fa9e4066Sahrens return (0); 246fa9e4066Sahrens } 247fa9e4066Sahrens 248fa9e4066Sahrens /* 249fa9e4066Sahrens * Common access routine. Disallow writes. 250fa9e4066Sahrens */ 251fa9e4066Sahrens /* ARGSUSED */ 252fa9e4066Sahrens static int 253fa9e4066Sahrens zfsctl_common_access(vnode_t *vp, int mode, int flags, cred_t *cr) 254fa9e4066Sahrens { 255fa9e4066Sahrens if (mode & VWRITE) 256fa9e4066Sahrens return (EACCES); 257fa9e4066Sahrens 258fa9e4066Sahrens return (0); 259fa9e4066Sahrens } 260fa9e4066Sahrens 261fa9e4066Sahrens /* 262fa9e4066Sahrens * Common getattr function. Fill in basic information. 263fa9e4066Sahrens */ 264fa9e4066Sahrens static void 265fa9e4066Sahrens zfsctl_common_getattr(vnode_t *vp, vattr_t *vap) 266fa9e4066Sahrens { 267fa9e4066Sahrens timestruc_t now; 268fa9e4066Sahrens 269fa9e4066Sahrens vap->va_uid = 0; 270fa9e4066Sahrens vap->va_gid = 0; 271fa9e4066Sahrens vap->va_rdev = 0; 272fa9e4066Sahrens /* 273fa9e4066Sahrens * We are a purly virtual object, so we have no 274fa9e4066Sahrens * blocksize or allocated blocks. 275fa9e4066Sahrens */ 276fa9e4066Sahrens vap->va_blksize = 0; 277fa9e4066Sahrens vap->va_nblocks = 0; 278fa9e4066Sahrens vap->va_seq = 0; 279fa9e4066Sahrens vap->va_fsid = vp->v_vfsp->vfs_dev; 280fa9e4066Sahrens vap->va_mode = S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP | 281fa9e4066Sahrens S_IROTH | S_IXOTH; 282fa9e4066Sahrens vap->va_type = VDIR; 283fa9e4066Sahrens /* 284fa9e4066Sahrens * We live in the now. 285fa9e4066Sahrens */ 286fa9e4066Sahrens gethrestime(&now); 287fa9e4066Sahrens vap->va_mtime = vap->va_ctime = vap->va_atime = now; 288fa9e4066Sahrens } 289fa9e4066Sahrens 290fa9e4066Sahrens static int 291fa9e4066Sahrens zfsctl_common_fid(vnode_t *vp, fid_t *fidp) 292fa9e4066Sahrens { 293fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 294fa9e4066Sahrens zfsctl_node_t *zcp = vp->v_data; 295fa9e4066Sahrens uint64_t object = zcp->zc_id; 296fa9e4066Sahrens zfid_short_t *zfid; 297fa9e4066Sahrens int i; 298fa9e4066Sahrens 299fa9e4066Sahrens ZFS_ENTER(zfsvfs); 300fa9e4066Sahrens 301fa9e4066Sahrens if (fidp->fid_len < SHORT_FID_LEN) { 302fa9e4066Sahrens fidp->fid_len = SHORT_FID_LEN; 303*0f2dc02eSek ZFS_EXIT(zfsvfs); 304fa9e4066Sahrens return (ENOSPC); 305fa9e4066Sahrens } 306fa9e4066Sahrens 307fa9e4066Sahrens zfid = (zfid_short_t *)fidp; 308fa9e4066Sahrens 309fa9e4066Sahrens zfid->zf_len = SHORT_FID_LEN; 310fa9e4066Sahrens 311fa9e4066Sahrens for (i = 0; i < sizeof (zfid->zf_object); i++) 312fa9e4066Sahrens zfid->zf_object[i] = (uint8_t)(object >> (8 * i)); 313fa9e4066Sahrens 314fa9e4066Sahrens /* .zfs znodes always have a generation number of 0 */ 315fa9e4066Sahrens for (i = 0; i < sizeof (zfid->zf_gen); i++) 316fa9e4066Sahrens zfid->zf_gen[i] = 0; 317fa9e4066Sahrens 318fa9e4066Sahrens ZFS_EXIT(zfsvfs); 319fa9e4066Sahrens return (0); 320fa9e4066Sahrens } 321fa9e4066Sahrens 322fa9e4066Sahrens /* 323fa9e4066Sahrens * .zfs inode namespace 324fa9e4066Sahrens * 325fa9e4066Sahrens * We need to generate unique inode numbers for all files and directories 326fa9e4066Sahrens * within the .zfs pseudo-filesystem. We use the following scheme: 327fa9e4066Sahrens * 328fa9e4066Sahrens * ENTRY ZFSCTL_INODE 329fa9e4066Sahrens * .zfs 1 330fa9e4066Sahrens * .zfs/snapshot 2 331fa9e4066Sahrens * .zfs/snapshot/<snap> objectid(snap) 332fa9e4066Sahrens */ 333fa9e4066Sahrens 334fa9e4066Sahrens #define ZFSCTL_INO_SNAP(id) (id) 335fa9e4066Sahrens 336fa9e4066Sahrens /* 337fa9e4066Sahrens * Get root directory attributes. 338fa9e4066Sahrens */ 339fa9e4066Sahrens /* ARGSUSED */ 340fa9e4066Sahrens static int 341fa9e4066Sahrens zfsctl_root_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr) 342fa9e4066Sahrens { 343fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 344fa9e4066Sahrens 345fa9e4066Sahrens ZFS_ENTER(zfsvfs); 346fa9e4066Sahrens vap->va_nodeid = ZFSCTL_INO_ROOT; 347fa9e4066Sahrens vap->va_nlink = vap->va_size = NROOT_ENTRIES; 348fa9e4066Sahrens 349fa9e4066Sahrens zfsctl_common_getattr(vp, vap); 350fa9e4066Sahrens ZFS_EXIT(zfsvfs); 351fa9e4066Sahrens 352fa9e4066Sahrens return (0); 353fa9e4066Sahrens } 354fa9e4066Sahrens 355fa9e4066Sahrens /* 356fa9e4066Sahrens * Special case the handling of "..". 357fa9e4066Sahrens */ 358fa9e4066Sahrens /* ARGSUSED */ 359fa9e4066Sahrens int 360fa9e4066Sahrens zfsctl_root_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, pathname_t *pnp, 361fa9e4066Sahrens int flags, vnode_t *rdir, cred_t *cr) 362fa9e4066Sahrens { 363fa9e4066Sahrens zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data; 364fa9e4066Sahrens int err; 365fa9e4066Sahrens 366fa9e4066Sahrens ZFS_ENTER(zfsvfs); 367fa9e4066Sahrens 368fa9e4066Sahrens if (strcmp(nm, "..") == 0) { 369fa9e4066Sahrens err = VFS_ROOT(dvp->v_vfsp, vpp); 370fa9e4066Sahrens } else { 371fa9e4066Sahrens err = gfs_dir_lookup(dvp, nm, vpp); 372fa9e4066Sahrens } 373fa9e4066Sahrens 374fa9e4066Sahrens ZFS_EXIT(zfsvfs); 375fa9e4066Sahrens 376fa9e4066Sahrens return (err); 377fa9e4066Sahrens } 378fa9e4066Sahrens 379fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_root[] = { 380fa9e4066Sahrens { VOPNAME_OPEN, zfsctl_common_open }, 381fa9e4066Sahrens { VOPNAME_CLOSE, zfsctl_common_close }, 382fa9e4066Sahrens { VOPNAME_IOCTL, fs_inval }, 383fa9e4066Sahrens { VOPNAME_GETATTR, zfsctl_root_getattr }, 384fa9e4066Sahrens { VOPNAME_ACCESS, zfsctl_common_access }, 385fa9e4066Sahrens { VOPNAME_READDIR, gfs_vop_readdir }, 386fa9e4066Sahrens { VOPNAME_LOOKUP, zfsctl_root_lookup }, 387fa9e4066Sahrens { VOPNAME_SEEK, fs_seek }, 388fa9e4066Sahrens { VOPNAME_INACTIVE, (fs_generic_func_p) gfs_vop_inactive }, 389fa9e4066Sahrens { VOPNAME_FID, zfsctl_common_fid }, 390fa9e4066Sahrens { NULL } 391fa9e4066Sahrens }; 392fa9e4066Sahrens 393fa9e4066Sahrens static int 394fa9e4066Sahrens zfsctl_snapshot_zname(vnode_t *vp, const char *name, int len, char *zname) 395fa9e4066Sahrens { 396fa9e4066Sahrens objset_t *os = ((zfsvfs_t *)((vp)->v_vfsp->vfs_data))->z_os; 397fa9e4066Sahrens 398fa9e4066Sahrens dmu_objset_name(os, zname); 3995422900bSmaybee if (strlen(zname) + 1 + strlen(name) >= len) 400fa9e4066Sahrens return (ENAMETOOLONG); 4015422900bSmaybee (void) strcat(zname, "@"); 402fa9e4066Sahrens (void) strcat(zname, name); 403fa9e4066Sahrens return (0); 404fa9e4066Sahrens } 405fa9e4066Sahrens 406fa9e4066Sahrens static int 407fa9e4066Sahrens zfsctl_unmount_snap(vnode_t *dvp, const char *name, int force, cred_t *cr) 408fa9e4066Sahrens { 409fa9e4066Sahrens zfsctl_snapdir_t *sdp = dvp->v_data; 410fa9e4066Sahrens zfs_snapentry_t search, *sep; 411fa9e4066Sahrens avl_index_t where; 412fa9e4066Sahrens int err; 413fa9e4066Sahrens 414fa9e4066Sahrens ASSERT(MUTEX_HELD(&sdp->sd_lock)); 415fa9e4066Sahrens 416fa9e4066Sahrens search.se_name = (char *)name; 417fa9e4066Sahrens if ((sep = avl_find(&sdp->sd_snaps, &search, &where)) == NULL) 418fa9e4066Sahrens return (ENOENT); 419fa9e4066Sahrens 420fa9e4066Sahrens ASSERT(vn_ismntpt(sep->se_root)); 421fa9e4066Sahrens 422fa9e4066Sahrens /* this will be dropped by dounmount() */ 423fa9e4066Sahrens if ((err = vn_vfswlock(sep->se_root)) != 0) 424fa9e4066Sahrens return (err); 425fa9e4066Sahrens 426fa9e4066Sahrens VN_HOLD(sep->se_root); 427fa9e4066Sahrens if ((err = dounmount(vn_mountedvfs(sep->se_root), force, kcred)) != 0) 428fa9e4066Sahrens return (err); 429fa9e4066Sahrens ASSERT(sep->se_root->v_count == 1); 430fa9e4066Sahrens gfs_vop_inactive(sep->se_root, cr); 431fa9e4066Sahrens 432fa9e4066Sahrens avl_remove(&sdp->sd_snaps, sep); 433fa9e4066Sahrens kmem_free(sep->se_name, strlen(sep->se_name) + 1); 434fa9e4066Sahrens kmem_free(sep, sizeof (zfs_snapentry_t)); 435fa9e4066Sahrens 436fa9e4066Sahrens return (0); 437fa9e4066Sahrens } 438fa9e4066Sahrens 439fa9e4066Sahrens 4405422900bSmaybee static void 441fa9e4066Sahrens zfsctl_rename_snap(zfsctl_snapdir_t *sdp, zfs_snapentry_t *sep, const char *nm) 442fa9e4066Sahrens { 443fa9e4066Sahrens avl_index_t where; 444fa9e4066Sahrens vfs_t *vfsp; 445fa9e4066Sahrens refstr_t *pathref; 446fa9e4066Sahrens char newpath[MAXNAMELEN]; 447fa9e4066Sahrens const char *oldpath; 448fa9e4066Sahrens char *tail; 449fa9e4066Sahrens 450fa9e4066Sahrens ASSERT(MUTEX_HELD(&sdp->sd_lock)); 451fa9e4066Sahrens ASSERT(sep != NULL); 452fa9e4066Sahrens 453fa9e4066Sahrens vfsp = vn_mountedvfs(sep->se_root); 454fa9e4066Sahrens ASSERT(vfsp != NULL); 455fa9e4066Sahrens 4565422900bSmaybee vfs_lock_wait(vfsp); 457fa9e4066Sahrens 458fa9e4066Sahrens /* 459fa9e4066Sahrens * Change the name in the AVL tree. 460fa9e4066Sahrens */ 461fa9e4066Sahrens avl_remove(&sdp->sd_snaps, sep); 462fa9e4066Sahrens kmem_free(sep->se_name, strlen(sep->se_name) + 1); 463fa9e4066Sahrens sep->se_name = kmem_alloc(strlen(nm) + 1, KM_SLEEP); 464fa9e4066Sahrens (void) strcpy(sep->se_name, nm); 465fa9e4066Sahrens VERIFY(avl_find(&sdp->sd_snaps, sep, &where) == NULL); 466fa9e4066Sahrens avl_insert(&sdp->sd_snaps, sep, where); 467fa9e4066Sahrens 468fa9e4066Sahrens /* 469fa9e4066Sahrens * Change the current mountpoint info: 470fa9e4066Sahrens * - update the tail of the mntpoint path 471fa9e4066Sahrens * - update the tail of the resource path 472fa9e4066Sahrens */ 473fa9e4066Sahrens pathref = vfs_getmntpoint(vfsp); 474fa9e4066Sahrens oldpath = refstr_value(pathref); 475fa9e4066Sahrens VERIFY((tail = strrchr(oldpath, '/')) != NULL); 476fa9e4066Sahrens ASSERT((tail - oldpath) + strlen(nm) + 2 < MAXNAMELEN); 477fa9e4066Sahrens (void) strncpy(newpath, oldpath, tail - oldpath + 1); 478fa9e4066Sahrens (void) strcat(newpath, nm); 479fa9e4066Sahrens refstr_rele(pathref); 480fa9e4066Sahrens vfs_setmntpoint(vfsp, newpath); 481fa9e4066Sahrens 482fa9e4066Sahrens pathref = vfs_getresource(vfsp); 483fa9e4066Sahrens oldpath = refstr_value(pathref); 484fa9e4066Sahrens VERIFY((tail = strrchr(oldpath, '@')) != NULL); 485fa9e4066Sahrens ASSERT((tail - oldpath) + strlen(nm) + 2 < MAXNAMELEN); 486fa9e4066Sahrens (void) strncpy(newpath, oldpath, tail - oldpath + 1); 487fa9e4066Sahrens (void) strcat(newpath, nm); 488fa9e4066Sahrens refstr_rele(pathref); 489fa9e4066Sahrens vfs_setresource(vfsp, newpath); 490fa9e4066Sahrens 491fa9e4066Sahrens vfs_unlock(vfsp); 492fa9e4066Sahrens } 493fa9e4066Sahrens 494fa9e4066Sahrens static int 495fa9e4066Sahrens zfsctl_snapdir_rename(vnode_t *sdvp, char *snm, vnode_t *tdvp, char *tnm, 496fa9e4066Sahrens cred_t *cr) 497fa9e4066Sahrens { 498fa9e4066Sahrens zfsctl_snapdir_t *sdp = sdvp->v_data; 499fa9e4066Sahrens zfs_snapentry_t search, *sep; 500fa9e4066Sahrens avl_index_t where; 501fa9e4066Sahrens char from[MAXNAMELEN], to[MAXNAMELEN]; 502fa9e4066Sahrens int err; 503fa9e4066Sahrens 5045422900bSmaybee err = zfsctl_snapshot_zname(sdvp, snm, MAXNAMELEN, from); 5055422900bSmaybee if (err) 5065422900bSmaybee return (err); 507fa9e4066Sahrens err = zfs_secpolicy_write(from, NULL, cr); 508fa9e4066Sahrens if (err) 509fa9e4066Sahrens return (err); 510fa9e4066Sahrens 511fa9e4066Sahrens /* 512fa9e4066Sahrens * Cannot move snapshots out of the snapdir. 513fa9e4066Sahrens */ 514fa9e4066Sahrens if (sdvp != tdvp) 515fa9e4066Sahrens return (EINVAL); 516fa9e4066Sahrens 517fa9e4066Sahrens if (strcmp(snm, tnm) == 0) 518fa9e4066Sahrens return (0); 519fa9e4066Sahrens 5205422900bSmaybee err = zfsctl_snapshot_zname(tdvp, tnm, MAXNAMELEN, to); 5215422900bSmaybee if (err) 5225422900bSmaybee return (err); 5235422900bSmaybee 524fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 525fa9e4066Sahrens 526fa9e4066Sahrens search.se_name = (char *)snm; 5275422900bSmaybee if ((sep = avl_find(&sdp->sd_snaps, &search, &where)) == NULL) { 5285422900bSmaybee mutex_exit(&sdp->sd_lock); 5295422900bSmaybee return (ENOENT); 530fa9e4066Sahrens } 531fa9e4066Sahrens 532fa9e4066Sahrens err = dmu_objset_rename(from, to); 5335422900bSmaybee if (err == 0) 5345422900bSmaybee zfsctl_rename_snap(sdp, sep, tnm); 535fa9e4066Sahrens 536fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 537fa9e4066Sahrens 538fa9e4066Sahrens return (err); 539fa9e4066Sahrens } 540fa9e4066Sahrens 541fa9e4066Sahrens /* ARGSUSED */ 542fa9e4066Sahrens static int 543fa9e4066Sahrens zfsctl_snapdir_remove(vnode_t *dvp, char *name, vnode_t *cwd, cred_t *cr) 544fa9e4066Sahrens { 545fa9e4066Sahrens zfsctl_snapdir_t *sdp = dvp->v_data; 546fa9e4066Sahrens char snapname[MAXNAMELEN]; 547fa9e4066Sahrens int err; 548fa9e4066Sahrens 5495422900bSmaybee err = zfsctl_snapshot_zname(dvp, name, MAXNAMELEN, snapname); 5505422900bSmaybee if (err) 5515422900bSmaybee return (err); 552fa9e4066Sahrens err = zfs_secpolicy_write(snapname, NULL, cr); 553fa9e4066Sahrens if (err) 554fa9e4066Sahrens return (err); 555fa9e4066Sahrens 556fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 557fa9e4066Sahrens 558fa9e4066Sahrens err = zfsctl_unmount_snap(dvp, name, 0, cr); 559fa9e4066Sahrens if (err) { 560fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 561fa9e4066Sahrens return (err); 562fa9e4066Sahrens } 563fa9e4066Sahrens 564fa9e4066Sahrens err = dmu_objset_destroy(snapname); 565fa9e4066Sahrens 566fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 567fa9e4066Sahrens 568fa9e4066Sahrens return (err); 569fa9e4066Sahrens } 570fa9e4066Sahrens 571fa9e4066Sahrens /* 572fa9e4066Sahrens * Lookup entry point for the 'snapshot' directory. Try to open the 573fa9e4066Sahrens * snapshot if it exist, creating the pseudo filesystem vnode as necessary. 574fa9e4066Sahrens * Perform a mount of the associated dataset on top of the vnode. 575fa9e4066Sahrens */ 576fa9e4066Sahrens /* ARGSUSED */ 577fa9e4066Sahrens static int 578fa9e4066Sahrens zfsctl_snapdir_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, pathname_t *pnp, 579fa9e4066Sahrens int flags, vnode_t *rdir, cred_t *cr) 580fa9e4066Sahrens { 581fa9e4066Sahrens zfsctl_snapdir_t *sdp = dvp->v_data; 582fa9e4066Sahrens objset_t *snap; 583fa9e4066Sahrens char snapname[MAXNAMELEN]; 584fa9e4066Sahrens char *mountpoint; 585fa9e4066Sahrens zfs_snapentry_t *sep, search; 586fa9e4066Sahrens struct mounta margs; 587fa9e4066Sahrens vfs_t *vfsp; 588fa9e4066Sahrens size_t mountpoint_len; 589fa9e4066Sahrens avl_index_t where; 590fa9e4066Sahrens zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data; 591fa9e4066Sahrens int err; 592fa9e4066Sahrens 593fa9e4066Sahrens ASSERT(dvp->v_type == VDIR); 594fa9e4066Sahrens 595fa9e4066Sahrens if (gfs_lookup_dot(vpp, dvp, zfsvfs->z_ctldir, nm) == 0) 596fa9e4066Sahrens return (0); 597fa9e4066Sahrens 598fa9e4066Sahrens /* 599fa9e4066Sahrens * If we get a recursive call, that means we got called 600fa9e4066Sahrens * from the domount() code while it was trying to look up the 601fa9e4066Sahrens * spec (which looks like a local path for zfs). We need to 602fa9e4066Sahrens * add some flag to domount() to tell it not to do this lookup. 603fa9e4066Sahrens */ 604fa9e4066Sahrens if (MUTEX_HELD(&sdp->sd_lock)) 605fa9e4066Sahrens return (ENOENT); 606fa9e4066Sahrens 607fa9e4066Sahrens ZFS_ENTER(zfsvfs); 608fa9e4066Sahrens 609fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 610fa9e4066Sahrens search.se_name = (char *)nm; 611fa9e4066Sahrens if ((sep = avl_find(&sdp->sd_snaps, &search, &where)) != NULL) { 612fa9e4066Sahrens *vpp = sep->se_root; 613fa9e4066Sahrens VN_HOLD(*vpp); 614fa9e4066Sahrens /* 615fa9e4066Sahrens * If the snapshot was unmounted behind our backs, remount it. 616fa9e4066Sahrens */ 617fa9e4066Sahrens if (!vn_ismntpt(*vpp)) 618fa9e4066Sahrens goto domount; 619fa9e4066Sahrens VERIFY(traverse(vpp) == 0); 620fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 621fa9e4066Sahrens ZFS_EXIT(zfsvfs); 622fa9e4066Sahrens return (0); 623fa9e4066Sahrens } 624fa9e4066Sahrens 625fa9e4066Sahrens /* 626fa9e4066Sahrens * The requested snapshot is not currently mounted, look it up. 627fa9e4066Sahrens */ 6285422900bSmaybee err = zfsctl_snapshot_zname(dvp, nm, MAXNAMELEN, snapname); 6295422900bSmaybee if (err) { 6305422900bSmaybee mutex_exit(&sdp->sd_lock); 6315422900bSmaybee ZFS_EXIT(zfsvfs); 6325422900bSmaybee return (err); 6335422900bSmaybee } 634fa9e4066Sahrens if (dmu_objset_open(snapname, DMU_OST_ZFS, 635fa9e4066Sahrens DS_MODE_STANDARD | DS_MODE_READONLY, &snap) != 0) { 636fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 637fa9e4066Sahrens ZFS_EXIT(zfsvfs); 638fa9e4066Sahrens return (ENOENT); 639fa9e4066Sahrens } 640fa9e4066Sahrens 641fa9e4066Sahrens sep = kmem_alloc(sizeof (zfs_snapentry_t), KM_SLEEP); 642fa9e4066Sahrens sep->se_name = kmem_alloc(strlen(nm) + 1, KM_SLEEP); 643fa9e4066Sahrens (void) strcpy(sep->se_name, nm); 644fa9e4066Sahrens *vpp = sep->se_root = zfsctl_snapshot_mknode(dvp, dmu_objset_id(snap)); 645fa9e4066Sahrens avl_insert(&sdp->sd_snaps, sep, where); 646fa9e4066Sahrens 647fa9e4066Sahrens dmu_objset_close(snap); 648fa9e4066Sahrens domount: 649fa9e4066Sahrens mountpoint_len = strlen(refstr_value(dvp->v_vfsp->vfs_mntpt)) + 650fa9e4066Sahrens strlen("/.zfs/snapshot/") + strlen(nm) + 1; 651fa9e4066Sahrens mountpoint = kmem_alloc(mountpoint_len, KM_SLEEP); 652fa9e4066Sahrens (void) snprintf(mountpoint, mountpoint_len, "%s/.zfs/snapshot/%s", 653fa9e4066Sahrens refstr_value(dvp->v_vfsp->vfs_mntpt), nm); 654fa9e4066Sahrens 655fa9e4066Sahrens margs.spec = snapname; 656fa9e4066Sahrens margs.dir = mountpoint; 657fa9e4066Sahrens margs.flags = MS_SYSSPACE | MS_NOMNTTAB; 658fa9e4066Sahrens margs.fstype = "zfs"; 659fa9e4066Sahrens margs.dataptr = NULL; 660fa9e4066Sahrens margs.datalen = 0; 661fa9e4066Sahrens margs.optptr = NULL; 662fa9e4066Sahrens margs.optlen = 0; 663fa9e4066Sahrens 664fa9e4066Sahrens err = domount("zfs", &margs, *vpp, kcred, &vfsp); 665fa9e4066Sahrens kmem_free(mountpoint, mountpoint_len); 666fa9e4066Sahrens 66795c9592aSmaybee if (err == 0) { 66895c9592aSmaybee /* 66995c9592aSmaybee * Return the mounted root rather than the covered mount point. 67095c9592aSmaybee */ 67195c9592aSmaybee VFS_RELE(vfsp); 67295c9592aSmaybee err = traverse(vpp); 67395c9592aSmaybee } 674fa9e4066Sahrens 67595c9592aSmaybee if (err == 0) { 67695c9592aSmaybee /* 67795c9592aSmaybee * Fix up the root vnode. 67895c9592aSmaybee */ 67995c9592aSmaybee ASSERT(VTOZ(*vpp)->z_zfsvfs != zfsvfs); 68095c9592aSmaybee VTOZ(*vpp)->z_zfsvfs->z_parent = zfsvfs; 68195c9592aSmaybee (*vpp)->v_vfsp = zfsvfs->z_vfs; 68295c9592aSmaybee (*vpp)->v_flag &= ~VROOT; 68395c9592aSmaybee } 684fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 685fa9e4066Sahrens ZFS_EXIT(zfsvfs); 686fa9e4066Sahrens 68795c9592aSmaybee if (err) 68895c9592aSmaybee VN_RELE(*vpp); 68995c9592aSmaybee return (err); 690fa9e4066Sahrens } 691fa9e4066Sahrens 692fa9e4066Sahrens /* ARGSUSED */ 693fa9e4066Sahrens static int 694fa9e4066Sahrens zfsctl_snapdir_readdir_cb(vnode_t *vp, struct dirent64 *dp, int *eofp, 695fa9e4066Sahrens offset_t *offp, offset_t *nextp, void *data) 696fa9e4066Sahrens { 697fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 698fa9e4066Sahrens char snapname[MAXNAMELEN]; 699fa9e4066Sahrens uint64_t id, cookie; 700fa9e4066Sahrens 701fa9e4066Sahrens ZFS_ENTER(zfsvfs); 702fa9e4066Sahrens 703fa9e4066Sahrens cookie = *offp; 704fa9e4066Sahrens if (dmu_snapshot_list_next(zfsvfs->z_os, MAXNAMELEN, snapname, &id, 705fa9e4066Sahrens &cookie) == ENOENT) { 706fa9e4066Sahrens *eofp = 1; 707fa9e4066Sahrens ZFS_EXIT(zfsvfs); 708fa9e4066Sahrens return (0); 709fa9e4066Sahrens } 710fa9e4066Sahrens 711fa9e4066Sahrens (void) strcpy(dp->d_name, snapname); 712fa9e4066Sahrens dp->d_ino = ZFSCTL_INO_SNAP(id); 713fa9e4066Sahrens *nextp = cookie; 714fa9e4066Sahrens 715fa9e4066Sahrens ZFS_EXIT(zfsvfs); 716fa9e4066Sahrens 717fa9e4066Sahrens return (0); 718fa9e4066Sahrens } 719fa9e4066Sahrens 720fa9e4066Sahrens vnode_t * 721fa9e4066Sahrens zfsctl_mknode_snapdir(vnode_t *pvp) 722fa9e4066Sahrens { 723fa9e4066Sahrens vnode_t *vp; 724fa9e4066Sahrens zfsctl_snapdir_t *sdp; 725fa9e4066Sahrens 726fa9e4066Sahrens vp = gfs_dir_create(sizeof (zfsctl_snapdir_t), pvp, 727fa9e4066Sahrens zfsctl_ops_snapdir, NULL, NULL, MAXNAMELEN, 728fa9e4066Sahrens zfsctl_snapdir_readdir_cb, NULL); 729fa9e4066Sahrens sdp = vp->v_data; 730fa9e4066Sahrens sdp->sd_node.zc_id = ZFSCTL_INO_SNAPDIR; 731fa9e4066Sahrens mutex_init(&sdp->sd_lock, NULL, MUTEX_DEFAULT, NULL); 732fa9e4066Sahrens avl_create(&sdp->sd_snaps, snapentry_compare, 733fa9e4066Sahrens sizeof (zfs_snapentry_t), offsetof(zfs_snapentry_t, se_node)); 734fa9e4066Sahrens return (vp); 735fa9e4066Sahrens } 736fa9e4066Sahrens 737fa9e4066Sahrens /* ARGSUSED */ 738fa9e4066Sahrens static int 739fa9e4066Sahrens zfsctl_snapdir_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr) 740fa9e4066Sahrens { 741fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 742fa9e4066Sahrens zfsctl_snapdir_t *sdp = vp->v_data; 743fa9e4066Sahrens 744fa9e4066Sahrens ZFS_ENTER(zfsvfs); 745fa9e4066Sahrens zfsctl_common_getattr(vp, vap); 746fa9e4066Sahrens vap->va_nodeid = gfs_file_inode(vp); 747fa9e4066Sahrens vap->va_nlink = vap->va_size = avl_numnodes(&sdp->sd_snaps) + 2; 748fa9e4066Sahrens ZFS_EXIT(zfsvfs); 749fa9e4066Sahrens 750fa9e4066Sahrens return (0); 751fa9e4066Sahrens } 752fa9e4066Sahrens 753fa9e4066Sahrens static void 754fa9e4066Sahrens zfsctl_snapdir_inactive(vnode_t *vp, cred_t *cr) 755fa9e4066Sahrens { 756fa9e4066Sahrens zfsctl_snapdir_t *sdp = vp->v_data; 757fa9e4066Sahrens 758fa9e4066Sahrens ASSERT(avl_numnodes(&sdp->sd_snaps) == 0); 759fa9e4066Sahrens mutex_destroy(&sdp->sd_lock); 760fa9e4066Sahrens avl_destroy(&sdp->sd_snaps); 761fa9e4066Sahrens gfs_vop_inactive(vp, cr); 762fa9e4066Sahrens } 763fa9e4066Sahrens 764fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapdir[] = { 765fa9e4066Sahrens { VOPNAME_OPEN, zfsctl_common_open }, 766fa9e4066Sahrens { VOPNAME_CLOSE, zfsctl_common_close }, 767fa9e4066Sahrens { VOPNAME_IOCTL, fs_inval }, 768fa9e4066Sahrens { VOPNAME_GETATTR, zfsctl_snapdir_getattr }, 769fa9e4066Sahrens { VOPNAME_ACCESS, zfsctl_common_access }, 770fa9e4066Sahrens { VOPNAME_RENAME, zfsctl_snapdir_rename }, 771fa9e4066Sahrens { VOPNAME_RMDIR, zfsctl_snapdir_remove }, 772fa9e4066Sahrens { VOPNAME_READDIR, gfs_vop_readdir }, 773fa9e4066Sahrens { VOPNAME_LOOKUP, zfsctl_snapdir_lookup }, 774fa9e4066Sahrens { VOPNAME_SEEK, fs_seek }, 775fa9e4066Sahrens { VOPNAME_INACTIVE, (fs_generic_func_p) zfsctl_snapdir_inactive }, 776fa9e4066Sahrens { VOPNAME_FID, zfsctl_common_fid }, 777fa9e4066Sahrens { NULL } 778fa9e4066Sahrens }; 779fa9e4066Sahrens 780fa9e4066Sahrens static vnode_t * 781fa9e4066Sahrens zfsctl_snapshot_mknode(vnode_t *pvp, uint64_t objset) 782fa9e4066Sahrens { 783fa9e4066Sahrens vnode_t *vp; 784fa9e4066Sahrens zfsctl_node_t *zcp; 785fa9e4066Sahrens 786fa9e4066Sahrens vp = gfs_dir_create(sizeof (zfsctl_node_t), pvp, 787fa9e4066Sahrens zfsctl_ops_snapshot, NULL, NULL, MAXNAMELEN, NULL, NULL); 788fa9e4066Sahrens zcp = vp->v_data; 789fa9e4066Sahrens zcp->zc_id = objset; 790fa9e4066Sahrens 791fa9e4066Sahrens return (vp); 792fa9e4066Sahrens } 793fa9e4066Sahrens 794fa9e4066Sahrens static void 795fa9e4066Sahrens zfsctl_snapshot_inactive(vnode_t *vp, cred_t *cr) 796fa9e4066Sahrens { 797fa9e4066Sahrens zfsctl_snapdir_t *sdp; 798fa9e4066Sahrens zfs_snapentry_t *sep, *next; 799fa9e4066Sahrens vnode_t *dvp; 800fa9e4066Sahrens 801fa9e4066Sahrens VERIFY(gfs_dir_lookup(vp, "..", &dvp) == 0); 802fa9e4066Sahrens sdp = dvp->v_data; 803fa9e4066Sahrens 804fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 805fa9e4066Sahrens 806fa9e4066Sahrens if (vp->v_count > 1) { 807fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 808fa9e4066Sahrens return; 809fa9e4066Sahrens } 810fa9e4066Sahrens ASSERT(!vn_ismntpt(vp)); 811fa9e4066Sahrens 812fa9e4066Sahrens sep = avl_first(&sdp->sd_snaps); 813fa9e4066Sahrens while (sep != NULL) { 814fa9e4066Sahrens next = AVL_NEXT(&sdp->sd_snaps, sep); 815fa9e4066Sahrens 816fa9e4066Sahrens if (sep->se_root == vp) { 817fa9e4066Sahrens avl_remove(&sdp->sd_snaps, sep); 818fa9e4066Sahrens kmem_free(sep->se_name, strlen(sep->se_name) + 1); 819fa9e4066Sahrens kmem_free(sep, sizeof (zfs_snapentry_t)); 820fa9e4066Sahrens break; 821fa9e4066Sahrens } 822fa9e4066Sahrens sep = next; 823fa9e4066Sahrens } 824fa9e4066Sahrens ASSERT(sep != NULL); 825fa9e4066Sahrens 826fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 827fa9e4066Sahrens VN_RELE(dvp); 828fa9e4066Sahrens 829fa9e4066Sahrens gfs_vop_inactive(vp, cr); 830fa9e4066Sahrens } 831fa9e4066Sahrens 832fa9e4066Sahrens 833fa9e4066Sahrens /* 834fa9e4066Sahrens * These VP's should never see the light of day. They should always 835fa9e4066Sahrens * be covered. 836fa9e4066Sahrens */ 837fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapshot[] = { 838fa9e4066Sahrens VOPNAME_INACTIVE, (fs_generic_func_p) zfsctl_snapshot_inactive, 839fa9e4066Sahrens NULL, NULL 840fa9e4066Sahrens }; 841fa9e4066Sahrens 842fa9e4066Sahrens int 843fa9e4066Sahrens zfsctl_lookup_objset(vfs_t *vfsp, uint64_t objsetid, zfsvfs_t **zfsvfsp) 844fa9e4066Sahrens { 845fa9e4066Sahrens zfsvfs_t *zfsvfs = vfsp->vfs_data; 846fa9e4066Sahrens vnode_t *dvp, *vp; 847fa9e4066Sahrens zfsctl_snapdir_t *sdp; 848fa9e4066Sahrens zfsctl_node_t *zcp; 849fa9e4066Sahrens zfs_snapentry_t *sep; 850fa9e4066Sahrens int error; 851fa9e4066Sahrens 852fa9e4066Sahrens ASSERT(zfsvfs->z_ctldir != NULL); 853fa9e4066Sahrens error = zfsctl_root_lookup(zfsvfs->z_ctldir, "snapshot", &dvp, 854fa9e4066Sahrens NULL, 0, NULL, kcred); 855fa9e4066Sahrens if (error != 0) 856fa9e4066Sahrens return (error); 857fa9e4066Sahrens sdp = dvp->v_data; 858fa9e4066Sahrens 859fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 860fa9e4066Sahrens sep = avl_first(&sdp->sd_snaps); 861fa9e4066Sahrens while (sep != NULL) { 862fa9e4066Sahrens vp = sep->se_root; 863fa9e4066Sahrens zcp = vp->v_data; 864fa9e4066Sahrens if (zcp->zc_id == objsetid) 865fa9e4066Sahrens break; 866fa9e4066Sahrens 867fa9e4066Sahrens sep = AVL_NEXT(&sdp->sd_snaps, sep); 868fa9e4066Sahrens } 869fa9e4066Sahrens 870fa9e4066Sahrens if (sep != NULL) { 871fa9e4066Sahrens VN_HOLD(vp); 872fa9e4066Sahrens error = traverse(&vp); 873fa9e4066Sahrens if (error == 0) 874fa9e4066Sahrens *zfsvfsp = VTOZ(vp)->z_zfsvfs; 875fa9e4066Sahrens VN_RELE(vp); 876fa9e4066Sahrens } else { 877fa9e4066Sahrens error = EINVAL; 878fa9e4066Sahrens } 879fa9e4066Sahrens 880fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 881fa9e4066Sahrens VN_RELE(dvp); 882fa9e4066Sahrens 883fa9e4066Sahrens return (error); 884fa9e4066Sahrens } 885fa9e4066Sahrens 886fa9e4066Sahrens /* 887fa9e4066Sahrens * Unmount any snapshots for the given filesystem. This is called from 888fa9e4066Sahrens * zfs_umount() - if we have a ctldir, then go through and unmount all the 889fa9e4066Sahrens * snapshots. 890fa9e4066Sahrens */ 891fa9e4066Sahrens int 892fa9e4066Sahrens zfsctl_umount_snapshots(vfs_t *vfsp, int fflags, cred_t *cr) 893fa9e4066Sahrens { 894fa9e4066Sahrens zfsvfs_t *zfsvfs = vfsp->vfs_data; 895fa9e4066Sahrens vnode_t *dvp, *svp; 896fa9e4066Sahrens zfsctl_snapdir_t *sdp; 897fa9e4066Sahrens zfs_snapentry_t *sep, *next; 898fa9e4066Sahrens int error; 899fa9e4066Sahrens 900fa9e4066Sahrens ASSERT(zfsvfs->z_ctldir != NULL); 901fa9e4066Sahrens error = zfsctl_root_lookup(zfsvfs->z_ctldir, "snapshot", &dvp, 902fa9e4066Sahrens NULL, 0, NULL, cr); 903fa9e4066Sahrens if (error != 0) 904fa9e4066Sahrens return (error); 905fa9e4066Sahrens sdp = dvp->v_data; 906fa9e4066Sahrens 907fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 908fa9e4066Sahrens 909fa9e4066Sahrens sep = avl_first(&sdp->sd_snaps); 910fa9e4066Sahrens while (sep != NULL) { 911fa9e4066Sahrens svp = sep->se_root; 912fa9e4066Sahrens next = AVL_NEXT(&sdp->sd_snaps, sep); 913fa9e4066Sahrens 914fa9e4066Sahrens /* 915fa9e4066Sahrens * If this snapshot is not mounted, then it must 916fa9e4066Sahrens * have just been unmounted by somebody else, and 917fa9e4066Sahrens * will be cleaned up by zfsctl_snapdir_inactive(). 918fa9e4066Sahrens */ 919fa9e4066Sahrens if (vn_ismntpt(svp)) { 920fa9e4066Sahrens if ((error = vn_vfswlock(svp)) != 0) 921fa9e4066Sahrens goto out; 922fa9e4066Sahrens 923fa9e4066Sahrens VN_HOLD(svp); 924fa9e4066Sahrens error = dounmount(vn_mountedvfs(svp), fflags, cr); 925fa9e4066Sahrens if (error) { 926fa9e4066Sahrens VN_RELE(svp); 927fa9e4066Sahrens goto out; 928fa9e4066Sahrens } 929fa9e4066Sahrens 930fa9e4066Sahrens avl_remove(&sdp->sd_snaps, sep); 931fa9e4066Sahrens kmem_free(sep->se_name, strlen(sep->se_name) + 1); 932fa9e4066Sahrens kmem_free(sep, sizeof (zfs_snapentry_t)); 933fa9e4066Sahrens 934fa9e4066Sahrens /* 935fa9e4066Sahrens * We can't use VN_RELE(), as that will try to 936fa9e4066Sahrens * invoke zfsctl_snapdir_inactive(), and that 937fa9e4066Sahrens * would lead to an attempt to re-grab the sd_lock. 938fa9e4066Sahrens */ 939fa9e4066Sahrens ASSERT3U(svp->v_count, ==, 1); 940fa9e4066Sahrens gfs_vop_inactive(svp, cr); 941fa9e4066Sahrens } 942fa9e4066Sahrens sep = next; 943fa9e4066Sahrens } 944fa9e4066Sahrens out: 945fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 946fa9e4066Sahrens VN_RELE(dvp); 947fa9e4066Sahrens 948fa9e4066Sahrens return (error); 949fa9e4066Sahrens } 950