1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 50f2dc02eSek * Common Development and Distribution License (the "License"). 60f2dc02eSek * You may not use this file except in compliance with the License. 7fa9e4066Sahrens * 8fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 10fa9e4066Sahrens * See the License for the specific language governing permissions 11fa9e4066Sahrens * and limitations under the License. 12fa9e4066Sahrens * 13fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 16fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18fa9e4066Sahrens * 19fa9e4066Sahrens * CDDL HEADER END 20fa9e4066Sahrens */ 21fa9e4066Sahrens /* 22d39ee142SMark Shellenbaum * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23fa9e4066Sahrens */ 24fa9e4066Sahrens 25fa9e4066Sahrens /* 26fa9e4066Sahrens * ZFS control directory (a.k.a. ".zfs") 27fa9e4066Sahrens * 28fa9e4066Sahrens * This directory provides a common location for all ZFS meta-objects. 29fa9e4066Sahrens * Currently, this is only the 'snapshot' directory, but this may expand in the 30fa9e4066Sahrens * future. The elements are built using the GFS primitives, as the hierarchy 31fa9e4066Sahrens * does not actually exist on disk. 32fa9e4066Sahrens * 33fa9e4066Sahrens * For 'snapshot', we don't want to have all snapshots always mounted, because 34fa9e4066Sahrens * this would take up a huge amount of space in /etc/mnttab. We have three 35fa9e4066Sahrens * types of objects: 36fa9e4066Sahrens * 37fa9e4066Sahrens * ctldir ------> snapshotdir -------> snapshot 38fa9e4066Sahrens * | 39fa9e4066Sahrens * | 40fa9e4066Sahrens * V 41fa9e4066Sahrens * mounted fs 42fa9e4066Sahrens * 43fa9e4066Sahrens * The 'snapshot' node contains just enough information to lookup '..' and act 44fa9e4066Sahrens * as a mountpoint for the snapshot. Whenever we lookup a specific snapshot, we 45fa9e4066Sahrens * perform an automount of the underlying filesystem and return the 46fa9e4066Sahrens * corresponding vnode. 47fa9e4066Sahrens * 48fa9e4066Sahrens * All mounts are handled automatically by the kernel, but unmounts are 49fa9e4066Sahrens * (currently) handled from user land. The main reason is that there is no 50fa9e4066Sahrens * reliable way to auto-unmount the filesystem when it's "no longer in use". 51fa9e4066Sahrens * When the user unmounts a filesystem, we call zfsctl_unmount(), which 52fa9e4066Sahrens * unmounts any snapshots within the snapshot directory. 53f18faf3fSek * 54f18faf3fSek * The '.zfs', '.zfs/snapshot', and all directories created under 55f18faf3fSek * '.zfs/snapshot' (ie: '.zfs/snapshot/<snapname>') are all GFS nodes and 56f18faf3fSek * share the same vfs_t as the head filesystem (what '.zfs' lives under). 57f18faf3fSek * 58f18faf3fSek * File systems mounted ontop of the GFS nodes '.zfs/snapshot/<snapname>' 59f18faf3fSek * (ie: snapshots) are ZFS nodes and have their own unique vfs_t. 60f18faf3fSek * However, vnodes within these mounted on file systems have their v_vfsp 61f18faf3fSek * fields set to the head filesystem to make NFS happy (see 628bf40bf0Sck * zfsctl_snapdir_lookup()). We VFS_HOLD the head filesystem's vfs_t 638bf40bf0Sck * so that it cannot be freed until all snapshots have been unmounted. 64fa9e4066Sahrens */ 65fa9e4066Sahrens 66fa9e4066Sahrens #include <fs/fs_subr.h> 67fa9e4066Sahrens #include <sys/zfs_ctldir.h> 68fa9e4066Sahrens #include <sys/zfs_ioctl.h> 69fa9e4066Sahrens #include <sys/zfs_vfsops.h> 70aa59c4cbSrsb #include <sys/vfs_opreg.h> 71fa9e4066Sahrens #include <sys/gfs.h> 72fa9e4066Sahrens #include <sys/stat.h> 73fa9e4066Sahrens #include <sys/dmu.h> 74ecd6cf80Smarks #include <sys/dsl_deleg.h> 75fa9e4066Sahrens #include <sys/mount.h> 76ab04eb8eStimh #include <sys/sunddi.h> 77fa9e4066Sahrens 786d1e0b89Smarks #include "zfs_namecheck.h" 796d1e0b89Smarks 808bf40bf0Sck typedef struct zfsctl_node { 818bf40bf0Sck gfs_dir_t zc_gfs_private; 828bf40bf0Sck uint64_t zc_id; 838bf40bf0Sck timestruc_t zc_cmtime; /* ctime and mtime, always the same */ 848bf40bf0Sck } zfsctl_node_t; 858bf40bf0Sck 868bf40bf0Sck typedef struct zfsctl_snapdir { 878bf40bf0Sck zfsctl_node_t sd_node; 888bf40bf0Sck kmutex_t sd_lock; 898bf40bf0Sck avl_tree_t sd_snaps; 908bf40bf0Sck } zfsctl_snapdir_t; 918bf40bf0Sck 92fa9e4066Sahrens typedef struct { 93fa9e4066Sahrens char *se_name; 94fa9e4066Sahrens vnode_t *se_root; 95fa9e4066Sahrens avl_node_t se_node; 96fa9e4066Sahrens } zfs_snapentry_t; 97fa9e4066Sahrens 98fa9e4066Sahrens static int 99fa9e4066Sahrens snapentry_compare(const void *a, const void *b) 100fa9e4066Sahrens { 101fa9e4066Sahrens const zfs_snapentry_t *sa = a; 102fa9e4066Sahrens const zfs_snapentry_t *sb = b; 103fa9e4066Sahrens int ret = strcmp(sa->se_name, sb->se_name); 104fa9e4066Sahrens 105fa9e4066Sahrens if (ret < 0) 106fa9e4066Sahrens return (-1); 107fa9e4066Sahrens else if (ret > 0) 108fa9e4066Sahrens return (1); 109fa9e4066Sahrens else 110fa9e4066Sahrens return (0); 111fa9e4066Sahrens } 112fa9e4066Sahrens 113fa9e4066Sahrens vnodeops_t *zfsctl_ops_root; 114fa9e4066Sahrens vnodeops_t *zfsctl_ops_snapdir; 115fa9e4066Sahrens vnodeops_t *zfsctl_ops_snapshot; 116743a77edSAlan Wright vnodeops_t *zfsctl_ops_shares; 117743a77edSAlan Wright vnodeops_t *zfsctl_ops_shares_dir; 118fa9e4066Sahrens 119fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_root[]; 120fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapdir[]; 121fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapshot[]; 122743a77edSAlan Wright static const fs_operation_def_t zfsctl_tops_shares[]; 123fa9e4066Sahrens 124fa9e4066Sahrens static vnode_t *zfsctl_mknode_snapdir(vnode_t *); 125743a77edSAlan Wright static vnode_t *zfsctl_mknode_shares(vnode_t *); 126fa9e4066Sahrens static vnode_t *zfsctl_snapshot_mknode(vnode_t *, uint64_t objset); 1278bf40bf0Sck static int zfsctl_unmount_snap(zfs_snapentry_t *, int, cred_t *); 128fa9e4066Sahrens 129fa9e4066Sahrens static gfs_opsvec_t zfsctl_opsvec[] = { 130fa9e4066Sahrens { ".zfs", zfsctl_tops_root, &zfsctl_ops_root }, 131fa9e4066Sahrens { ".zfs/snapshot", zfsctl_tops_snapdir, &zfsctl_ops_snapdir }, 132fa9e4066Sahrens { ".zfs/snapshot/vnode", zfsctl_tops_snapshot, &zfsctl_ops_snapshot }, 133743a77edSAlan Wright { ".zfs/shares", zfsctl_tops_shares, &zfsctl_ops_shares_dir }, 134743a77edSAlan Wright { ".zfs/shares/vnode", zfsctl_tops_shares, &zfsctl_ops_shares }, 135fa9e4066Sahrens { NULL } 136fa9e4066Sahrens }; 137fa9e4066Sahrens 138fa9e4066Sahrens /* 139743a77edSAlan Wright * Root directory elements. We only have two entries 140743a77edSAlan Wright * snapshot and shares. 141fa9e4066Sahrens */ 142fa9e4066Sahrens static gfs_dirent_t zfsctl_root_entries[] = { 143fa9e4066Sahrens { "snapshot", zfsctl_mknode_snapdir, GFS_CACHE_VNODE }, 144743a77edSAlan Wright { "shares", zfsctl_mknode_shares, GFS_CACHE_VNODE }, 145fa9e4066Sahrens { NULL } 146fa9e4066Sahrens }; 147fa9e4066Sahrens 148fa9e4066Sahrens /* include . and .. in the calculation */ 149fa9e4066Sahrens #define NROOT_ENTRIES ((sizeof (zfsctl_root_entries) / \ 150fa9e4066Sahrens sizeof (gfs_dirent_t)) + 1) 151fa9e4066Sahrens 152fa9e4066Sahrens 153fa9e4066Sahrens /* 154fa9e4066Sahrens * Initialize the various GFS pieces we'll need to create and manipulate .zfs 155fa9e4066Sahrens * directories. This is called from the ZFS init routine, and initializes the 156fa9e4066Sahrens * vnode ops vectors that we'll be using. 157fa9e4066Sahrens */ 158fa9e4066Sahrens void 159fa9e4066Sahrens zfsctl_init(void) 160fa9e4066Sahrens { 161fa9e4066Sahrens VERIFY(gfs_make_opsvec(zfsctl_opsvec) == 0); 162fa9e4066Sahrens } 163fa9e4066Sahrens 164fa9e4066Sahrens void 165fa9e4066Sahrens zfsctl_fini(void) 166fa9e4066Sahrens { 167fa9e4066Sahrens /* 168fa9e4066Sahrens * Remove vfsctl vnode ops 169fa9e4066Sahrens */ 170fa9e4066Sahrens if (zfsctl_ops_root) 171fa9e4066Sahrens vn_freevnodeops(zfsctl_ops_root); 172fa9e4066Sahrens if (zfsctl_ops_snapdir) 173fa9e4066Sahrens vn_freevnodeops(zfsctl_ops_snapdir); 174fa9e4066Sahrens if (zfsctl_ops_snapshot) 175fa9e4066Sahrens vn_freevnodeops(zfsctl_ops_snapshot); 176743a77edSAlan Wright if (zfsctl_ops_shares) 177743a77edSAlan Wright vn_freevnodeops(zfsctl_ops_shares); 178743a77edSAlan Wright if (zfsctl_ops_shares_dir) 179743a77edSAlan Wright vn_freevnodeops(zfsctl_ops_shares_dir); 180fa9e4066Sahrens 181fa9e4066Sahrens zfsctl_ops_root = NULL; 182fa9e4066Sahrens zfsctl_ops_snapdir = NULL; 183fa9e4066Sahrens zfsctl_ops_snapshot = NULL; 184743a77edSAlan Wright zfsctl_ops_shares = NULL; 185743a77edSAlan Wright zfsctl_ops_shares_dir = NULL; 186fa9e4066Sahrens } 187fa9e4066Sahrens 188d39ee142SMark Shellenbaum boolean_t 189d39ee142SMark Shellenbaum zfsctl_is_node(vnode_t *vp) 190d39ee142SMark Shellenbaum { 191d39ee142SMark Shellenbaum return (vn_matchops(vp, zfsctl_ops_root) || 192d39ee142SMark Shellenbaum vn_matchops(vp, zfsctl_ops_snapdir) || 193d39ee142SMark Shellenbaum vn_matchops(vp, zfsctl_ops_snapshot) || 194d39ee142SMark Shellenbaum vn_matchops(vp, zfsctl_ops_shares) || 195d39ee142SMark Shellenbaum vn_matchops(vp, zfsctl_ops_shares_dir)); 196d39ee142SMark Shellenbaum 197d39ee142SMark Shellenbaum } 198d39ee142SMark Shellenbaum 199fa9e4066Sahrens /* 200743a77edSAlan Wright * Return the inode number associated with the 'snapshot' or 201743a77edSAlan Wright * 'shares' directory. 202fa9e4066Sahrens */ 203fa9e4066Sahrens /* ARGSUSED */ 204fa9e4066Sahrens static ino64_t 205fa9e4066Sahrens zfsctl_root_inode_cb(vnode_t *vp, int index) 206fa9e4066Sahrens { 207743a77edSAlan Wright zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 208743a77edSAlan Wright 209743a77edSAlan Wright ASSERT(index <= 2); 210743a77edSAlan Wright 211743a77edSAlan Wright if (index == 0) 212743a77edSAlan Wright return (ZFSCTL_INO_SNAPDIR); 213743a77edSAlan Wright 214743a77edSAlan Wright return (zfsvfs->z_shares_dir); 215fa9e4066Sahrens } 216fa9e4066Sahrens 217fa9e4066Sahrens /* 218fa9e4066Sahrens * Create the '.zfs' directory. This directory is cached as part of the VFS 219fa9e4066Sahrens * structure. This results in a hold on the vfs_t. The code in zfs_umount() 220fa9e4066Sahrens * therefore checks against a vfs_count of 2 instead of 1. This reference 221fa9e4066Sahrens * is removed when the ctldir is destroyed in the unmount. 222fa9e4066Sahrens */ 223fa9e4066Sahrens void 224fa9e4066Sahrens zfsctl_create(zfsvfs_t *zfsvfs) 225fa9e4066Sahrens { 226a32fded1Sek vnode_t *vp, *rvp; 227fa9e4066Sahrens zfsctl_node_t *zcp; 2280a586ceaSMark Shellenbaum uint64_t crtime[2]; 229fa9e4066Sahrens 230fa9e4066Sahrens ASSERT(zfsvfs->z_ctldir == NULL); 231fa9e4066Sahrens 232fa9e4066Sahrens vp = gfs_root_create(sizeof (zfsctl_node_t), zfsvfs->z_vfs, 233fa9e4066Sahrens zfsctl_ops_root, ZFSCTL_INO_ROOT, zfsctl_root_entries, 234fa9e4066Sahrens zfsctl_root_inode_cb, MAXNAMELEN, NULL, NULL); 235fa9e4066Sahrens zcp = vp->v_data; 236fa9e4066Sahrens zcp->zc_id = ZFSCTL_INO_ROOT; 237fa9e4066Sahrens 238a32fded1Sek VERIFY(VFS_ROOT(zfsvfs->z_vfs, &rvp) == 0); 2390a586ceaSMark Shellenbaum VERIFY(0 == sa_lookup(VTOZ(rvp)->z_sa_hdl, SA_ZPL_CRTIME(zfsvfs), 2400a586ceaSMark Shellenbaum &crtime, sizeof (crtime))); 2410a586ceaSMark Shellenbaum ZFS_TIME_DECODE(&zcp->zc_cmtime, crtime); 242a32fded1Sek VN_RELE(rvp); 243a32fded1Sek 244fa9e4066Sahrens /* 245fa9e4066Sahrens * We're only faking the fact that we have a root of a filesystem for 246fa9e4066Sahrens * the sake of the GFS interfaces. Undo the flag manipulation it did 247fa9e4066Sahrens * for us. 248fa9e4066Sahrens */ 249fa9e4066Sahrens vp->v_flag &= ~(VROOT | VNOCACHE | VNOMAP | VNOSWAP | VNOMOUNT); 250fa9e4066Sahrens 251fa9e4066Sahrens zfsvfs->z_ctldir = vp; 252fa9e4066Sahrens } 253fa9e4066Sahrens 254fa9e4066Sahrens /* 2558afd4dd6Sperrin * Destroy the '.zfs' directory. Only called when the filesystem is unmounted. 2568afd4dd6Sperrin * There might still be more references if we were force unmounted, but only 2578afd4dd6Sperrin * new zfs_inactive() calls can occur and they don't reference .zfs 258fa9e4066Sahrens */ 259fa9e4066Sahrens void 260fa9e4066Sahrens zfsctl_destroy(zfsvfs_t *zfsvfs) 261fa9e4066Sahrens { 262fa9e4066Sahrens VN_RELE(zfsvfs->z_ctldir); 263fa9e4066Sahrens zfsvfs->z_ctldir = NULL; 264fa9e4066Sahrens } 265fa9e4066Sahrens 266fa9e4066Sahrens /* 267fa9e4066Sahrens * Given a root znode, retrieve the associated .zfs directory. 268fa9e4066Sahrens * Add a hold to the vnode and return it. 269fa9e4066Sahrens */ 270fa9e4066Sahrens vnode_t * 271fa9e4066Sahrens zfsctl_root(znode_t *zp) 272fa9e4066Sahrens { 273fa9e4066Sahrens ASSERT(zfs_has_ctldir(zp)); 274fa9e4066Sahrens VN_HOLD(zp->z_zfsvfs->z_ctldir); 275fa9e4066Sahrens return (zp->z_zfsvfs->z_ctldir); 276fa9e4066Sahrens } 277fa9e4066Sahrens 278fa9e4066Sahrens /* 279fa9e4066Sahrens * Common open routine. Disallow any write access. 280fa9e4066Sahrens */ 281fa9e4066Sahrens /* ARGSUSED */ 282fa9e4066Sahrens static int 283da6c28aaSamw zfsctl_common_open(vnode_t **vpp, int flags, cred_t *cr, caller_context_t *ct) 284fa9e4066Sahrens { 285fa9e4066Sahrens if (flags & FWRITE) 286fa9e4066Sahrens return (EACCES); 287fa9e4066Sahrens 288fa9e4066Sahrens return (0); 289fa9e4066Sahrens } 290fa9e4066Sahrens 291fa9e4066Sahrens /* 292fa9e4066Sahrens * Common close routine. Nothing to do here. 293fa9e4066Sahrens */ 294fa9e4066Sahrens /* ARGSUSED */ 295fa9e4066Sahrens static int 296fa9e4066Sahrens zfsctl_common_close(vnode_t *vpp, int flags, int count, offset_t off, 297da6c28aaSamw cred_t *cr, caller_context_t *ct) 298fa9e4066Sahrens { 299fa9e4066Sahrens return (0); 300fa9e4066Sahrens } 301fa9e4066Sahrens 302fa9e4066Sahrens /* 303fa9e4066Sahrens * Common access routine. Disallow writes. 304fa9e4066Sahrens */ 305fa9e4066Sahrens /* ARGSUSED */ 306fa9e4066Sahrens static int 307da6c28aaSamw zfsctl_common_access(vnode_t *vp, int mode, int flags, cred_t *cr, 308da6c28aaSamw caller_context_t *ct) 309fa9e4066Sahrens { 31060030f27SMark Shellenbaum if (flags & V_ACE_MASK) { 31160030f27SMark Shellenbaum if (mode & ACE_ALL_WRITE_PERMS) 31260030f27SMark Shellenbaum return (EACCES); 31360030f27SMark Shellenbaum } else { 31460030f27SMark Shellenbaum if (mode & VWRITE) 31560030f27SMark Shellenbaum return (EACCES); 31660030f27SMark Shellenbaum } 317fa9e4066Sahrens 318fa9e4066Sahrens return (0); 319fa9e4066Sahrens } 320fa9e4066Sahrens 321fa9e4066Sahrens /* 322fa9e4066Sahrens * Common getattr function. Fill in basic information. 323fa9e4066Sahrens */ 324fa9e4066Sahrens static void 325fa9e4066Sahrens zfsctl_common_getattr(vnode_t *vp, vattr_t *vap) 326fa9e4066Sahrens { 327a32fded1Sek timestruc_t now; 328fa9e4066Sahrens 329fa9e4066Sahrens vap->va_uid = 0; 330fa9e4066Sahrens vap->va_gid = 0; 331fa9e4066Sahrens vap->va_rdev = 0; 332fa9e4066Sahrens /* 33371eb0538SChris Kirby * We are a purely virtual object, so we have no 334fa9e4066Sahrens * blocksize or allocated blocks. 335fa9e4066Sahrens */ 336fa9e4066Sahrens vap->va_blksize = 0; 337fa9e4066Sahrens vap->va_nblocks = 0; 338fa9e4066Sahrens vap->va_seq = 0; 339fa9e4066Sahrens vap->va_fsid = vp->v_vfsp->vfs_dev; 340fa9e4066Sahrens vap->va_mode = S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP | 341fa9e4066Sahrens S_IROTH | S_IXOTH; 342fa9e4066Sahrens vap->va_type = VDIR; 343fa9e4066Sahrens /* 344a32fded1Sek * We live in the now (for atime). 345fa9e4066Sahrens */ 346fa9e4066Sahrens gethrestime(&now); 347a32fded1Sek vap->va_atime = now; 348fa9e4066Sahrens } 349fa9e4066Sahrens 350da6c28aaSamw /*ARGSUSED*/ 351fa9e4066Sahrens static int 352da6c28aaSamw zfsctl_common_fid(vnode_t *vp, fid_t *fidp, caller_context_t *ct) 353fa9e4066Sahrens { 354fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 355fa9e4066Sahrens zfsctl_node_t *zcp = vp->v_data; 356fa9e4066Sahrens uint64_t object = zcp->zc_id; 357fa9e4066Sahrens zfid_short_t *zfid; 358fa9e4066Sahrens int i; 359fa9e4066Sahrens 360fa9e4066Sahrens ZFS_ENTER(zfsvfs); 361fa9e4066Sahrens 362fa9e4066Sahrens if (fidp->fid_len < SHORT_FID_LEN) { 363fa9e4066Sahrens fidp->fid_len = SHORT_FID_LEN; 3640f2dc02eSek ZFS_EXIT(zfsvfs); 365fa9e4066Sahrens return (ENOSPC); 366fa9e4066Sahrens } 367fa9e4066Sahrens 368fa9e4066Sahrens zfid = (zfid_short_t *)fidp; 369fa9e4066Sahrens 370fa9e4066Sahrens zfid->zf_len = SHORT_FID_LEN; 371fa9e4066Sahrens 372fa9e4066Sahrens for (i = 0; i < sizeof (zfid->zf_object); i++) 373fa9e4066Sahrens zfid->zf_object[i] = (uint8_t)(object >> (8 * i)); 374fa9e4066Sahrens 375fa9e4066Sahrens /* .zfs znodes always have a generation number of 0 */ 376fa9e4066Sahrens for (i = 0; i < sizeof (zfid->zf_gen); i++) 377fa9e4066Sahrens zfid->zf_gen[i] = 0; 378fa9e4066Sahrens 379fa9e4066Sahrens ZFS_EXIT(zfsvfs); 380fa9e4066Sahrens return (0); 381fa9e4066Sahrens } 382fa9e4066Sahrens 383743a77edSAlan Wright 384743a77edSAlan Wright /*ARGSUSED*/ 385743a77edSAlan Wright static int 386743a77edSAlan Wright zfsctl_shares_fid(vnode_t *vp, fid_t *fidp, caller_context_t *ct) 387743a77edSAlan Wright { 388743a77edSAlan Wright zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 389743a77edSAlan Wright znode_t *dzp; 390743a77edSAlan Wright int error; 391743a77edSAlan Wright 392743a77edSAlan Wright ZFS_ENTER(zfsvfs); 3939e1320c0SMark Shellenbaum 3949e1320c0SMark Shellenbaum if (zfsvfs->z_shares_dir == 0) { 3959e1320c0SMark Shellenbaum ZFS_EXIT(zfsvfs); 3969e1320c0SMark Shellenbaum return (ENOTSUP); 3979e1320c0SMark Shellenbaum } 3989e1320c0SMark Shellenbaum 399743a77edSAlan Wright if ((error = zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp)) == 0) { 400743a77edSAlan Wright error = VOP_FID(ZTOV(dzp), fidp, ct); 401743a77edSAlan Wright VN_RELE(ZTOV(dzp)); 402743a77edSAlan Wright } 403743a77edSAlan Wright 404743a77edSAlan Wright ZFS_EXIT(zfsvfs); 405743a77edSAlan Wright return (error); 406743a77edSAlan Wright } 407fa9e4066Sahrens /* 408fa9e4066Sahrens * .zfs inode namespace 409fa9e4066Sahrens * 410fa9e4066Sahrens * We need to generate unique inode numbers for all files and directories 411fa9e4066Sahrens * within the .zfs pseudo-filesystem. We use the following scheme: 412fa9e4066Sahrens * 413fa9e4066Sahrens * ENTRY ZFSCTL_INODE 414fa9e4066Sahrens * .zfs 1 415fa9e4066Sahrens * .zfs/snapshot 2 416fa9e4066Sahrens * .zfs/snapshot/<snap> objectid(snap) 417fa9e4066Sahrens */ 418fa9e4066Sahrens 419fa9e4066Sahrens #define ZFSCTL_INO_SNAP(id) (id) 420fa9e4066Sahrens 421fa9e4066Sahrens /* 422fa9e4066Sahrens * Get root directory attributes. 423fa9e4066Sahrens */ 424fa9e4066Sahrens /* ARGSUSED */ 425fa9e4066Sahrens static int 426da6c28aaSamw zfsctl_root_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr, 427da6c28aaSamw caller_context_t *ct) 428fa9e4066Sahrens { 429fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 43071eb0538SChris Kirby zfsctl_node_t *zcp = vp->v_data; 431fa9e4066Sahrens 432fa9e4066Sahrens ZFS_ENTER(zfsvfs); 433fa9e4066Sahrens vap->va_nodeid = ZFSCTL_INO_ROOT; 434fa9e4066Sahrens vap->va_nlink = vap->va_size = NROOT_ENTRIES; 43571eb0538SChris Kirby vap->va_mtime = vap->va_ctime = zcp->zc_cmtime; 436fa9e4066Sahrens 437fa9e4066Sahrens zfsctl_common_getattr(vp, vap); 438fa9e4066Sahrens ZFS_EXIT(zfsvfs); 439fa9e4066Sahrens 440fa9e4066Sahrens return (0); 441fa9e4066Sahrens } 442fa9e4066Sahrens 443fa9e4066Sahrens /* 444fa9e4066Sahrens * Special case the handling of "..". 445fa9e4066Sahrens */ 446fa9e4066Sahrens /* ARGSUSED */ 447fa9e4066Sahrens int 448fa9e4066Sahrens zfsctl_root_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, pathname_t *pnp, 449da6c28aaSamw int flags, vnode_t *rdir, cred_t *cr, caller_context_t *ct, 450da6c28aaSamw int *direntflags, pathname_t *realpnp) 451fa9e4066Sahrens { 452fa9e4066Sahrens zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data; 453fa9e4066Sahrens int err; 454fa9e4066Sahrens 455da6c28aaSamw /* 456da6c28aaSamw * No extended attributes allowed under .zfs 457da6c28aaSamw */ 458da6c28aaSamw if (flags & LOOKUP_XATTR) 459da6c28aaSamw return (EINVAL); 460da6c28aaSamw 461fa9e4066Sahrens ZFS_ENTER(zfsvfs); 462fa9e4066Sahrens 463fa9e4066Sahrens if (strcmp(nm, "..") == 0) { 464fa9e4066Sahrens err = VFS_ROOT(dvp->v_vfsp, vpp); 465fa9e4066Sahrens } else { 466ab04eb8eStimh err = gfs_vop_lookup(dvp, nm, vpp, pnp, flags, rdir, 467ab04eb8eStimh cr, ct, direntflags, realpnp); 468fa9e4066Sahrens } 469fa9e4066Sahrens 470fa9e4066Sahrens ZFS_EXIT(zfsvfs); 471fa9e4066Sahrens 472fa9e4066Sahrens return (err); 473fa9e4066Sahrens } 474fa9e4066Sahrens 47560030f27SMark Shellenbaum static int 47660030f27SMark Shellenbaum zfsctl_pathconf(vnode_t *vp, int cmd, ulong_t *valp, cred_t *cr, 47760030f27SMark Shellenbaum caller_context_t *ct) 47860030f27SMark Shellenbaum { 47960030f27SMark Shellenbaum /* 48060030f27SMark Shellenbaum * We only care about ACL_ENABLED so that libsec can 48160030f27SMark Shellenbaum * display ACL correctly and not default to POSIX draft. 48260030f27SMark Shellenbaum */ 48360030f27SMark Shellenbaum if (cmd == _PC_ACL_ENABLED) { 48460030f27SMark Shellenbaum *valp = _ACL_ACE_ENABLED; 48560030f27SMark Shellenbaum return (0); 48660030f27SMark Shellenbaum } 48760030f27SMark Shellenbaum 48860030f27SMark Shellenbaum return (fs_pathconf(vp, cmd, valp, cr, ct)); 48960030f27SMark Shellenbaum } 49060030f27SMark Shellenbaum 491fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_root[] = { 492aa59c4cbSrsb { VOPNAME_OPEN, { .vop_open = zfsctl_common_open } }, 493aa59c4cbSrsb { VOPNAME_CLOSE, { .vop_close = zfsctl_common_close } }, 494aa59c4cbSrsb { VOPNAME_IOCTL, { .error = fs_inval } }, 495aa59c4cbSrsb { VOPNAME_GETATTR, { .vop_getattr = zfsctl_root_getattr } }, 496aa59c4cbSrsb { VOPNAME_ACCESS, { .vop_access = zfsctl_common_access } }, 497aa59c4cbSrsb { VOPNAME_READDIR, { .vop_readdir = gfs_vop_readdir } }, 498aa59c4cbSrsb { VOPNAME_LOOKUP, { .vop_lookup = zfsctl_root_lookup } }, 499aa59c4cbSrsb { VOPNAME_SEEK, { .vop_seek = fs_seek } }, 500aa59c4cbSrsb { VOPNAME_INACTIVE, { .vop_inactive = gfs_vop_inactive } }, 50160030f27SMark Shellenbaum { VOPNAME_PATHCONF, { .vop_pathconf = zfsctl_pathconf } }, 502aa59c4cbSrsb { VOPNAME_FID, { .vop_fid = zfsctl_common_fid } }, 503fa9e4066Sahrens { NULL } 504fa9e4066Sahrens }; 505fa9e4066Sahrens 506fa9e4066Sahrens static int 507fa9e4066Sahrens zfsctl_snapshot_zname(vnode_t *vp, const char *name, int len, char *zname) 508fa9e4066Sahrens { 509fa9e4066Sahrens objset_t *os = ((zfsvfs_t *)((vp)->v_vfsp->vfs_data))->z_os; 510fa9e4066Sahrens 5116d1e0b89Smarks if (snapshot_namecheck(name, NULL, NULL) != 0) 5126d1e0b89Smarks return (EILSEQ); 513fa9e4066Sahrens dmu_objset_name(os, zname); 5145422900bSmaybee if (strlen(zname) + 1 + strlen(name) >= len) 515fa9e4066Sahrens return (ENAMETOOLONG); 5165422900bSmaybee (void) strcat(zname, "@"); 517fa9e4066Sahrens (void) strcat(zname, name); 518fa9e4066Sahrens return (0); 519fa9e4066Sahrens } 520fa9e4066Sahrens 5218bf40bf0Sck static int 5228bf40bf0Sck zfsctl_unmount_snap(zfs_snapentry_t *sep, int fflags, cred_t *cr) 523fa9e4066Sahrens { 5248bf40bf0Sck vnode_t *svp = sep->se_root; 5258bf40bf0Sck int error; 526fa9e4066Sahrens 5278bf40bf0Sck ASSERT(vn_ismntpt(svp)); 528fa9e4066Sahrens 529fa9e4066Sahrens /* this will be dropped by dounmount() */ 5308bf40bf0Sck if ((error = vn_vfswlock(svp)) != 0) 5318bf40bf0Sck return (error); 532fa9e4066Sahrens 5338bf40bf0Sck VN_HOLD(svp); 5348bf40bf0Sck error = dounmount(vn_mountedvfs(svp), fflags, cr); 5358bf40bf0Sck if (error) { 5368bf40bf0Sck VN_RELE(svp); 5378bf40bf0Sck return (error); 538bbf4a8dfSmaybee } 539142ae85dSChris Kirby 5408bf40bf0Sck /* 5418bf40bf0Sck * We can't use VN_RELE(), as that will try to invoke 5428bf40bf0Sck * zfsctl_snapdir_inactive(), which would cause us to destroy 5438bf40bf0Sck * the sd_lock mutex held by our caller. 5448bf40bf0Sck */ 5458bf40bf0Sck ASSERT(svp->v_count == 1); 5468bf40bf0Sck gfs_vop_inactive(svp, cr, NULL); 547fa9e4066Sahrens 548fa9e4066Sahrens kmem_free(sep->se_name, strlen(sep->se_name) + 1); 549fa9e4066Sahrens kmem_free(sep, sizeof (zfs_snapentry_t)); 550fa9e4066Sahrens 551fa9e4066Sahrens return (0); 552fa9e4066Sahrens } 553fa9e4066Sahrens 5545422900bSmaybee static void 555fa9e4066Sahrens zfsctl_rename_snap(zfsctl_snapdir_t *sdp, zfs_snapentry_t *sep, const char *nm) 556fa9e4066Sahrens { 557fa9e4066Sahrens avl_index_t where; 558fa9e4066Sahrens vfs_t *vfsp; 559fa9e4066Sahrens refstr_t *pathref; 560fa9e4066Sahrens char newpath[MAXNAMELEN]; 561fa9e4066Sahrens char *tail; 562fa9e4066Sahrens 563fa9e4066Sahrens ASSERT(MUTEX_HELD(&sdp->sd_lock)); 564fa9e4066Sahrens ASSERT(sep != NULL); 565fa9e4066Sahrens 566fa9e4066Sahrens vfsp = vn_mountedvfs(sep->se_root); 567fa9e4066Sahrens ASSERT(vfsp != NULL); 568fa9e4066Sahrens 5695422900bSmaybee vfs_lock_wait(vfsp); 570fa9e4066Sahrens 571fa9e4066Sahrens /* 572fa9e4066Sahrens * Change the name in the AVL tree. 573fa9e4066Sahrens */ 574fa9e4066Sahrens avl_remove(&sdp->sd_snaps, sep); 575fa9e4066Sahrens kmem_free(sep->se_name, strlen(sep->se_name) + 1); 576fa9e4066Sahrens sep->se_name = kmem_alloc(strlen(nm) + 1, KM_SLEEP); 577fa9e4066Sahrens (void) strcpy(sep->se_name, nm); 578fa9e4066Sahrens VERIFY(avl_find(&sdp->sd_snaps, sep, &where) == NULL); 579fa9e4066Sahrens avl_insert(&sdp->sd_snaps, sep, where); 580fa9e4066Sahrens 581fa9e4066Sahrens /* 582fa9e4066Sahrens * Change the current mountpoint info: 583fa9e4066Sahrens * - update the tail of the mntpoint path 584fa9e4066Sahrens * - update the tail of the resource path 585fa9e4066Sahrens */ 586fa9e4066Sahrens pathref = vfs_getmntpoint(vfsp); 5870b69c2f0Sahrens (void) strncpy(newpath, refstr_value(pathref), sizeof (newpath)); 5880b69c2f0Sahrens VERIFY((tail = strrchr(newpath, '/')) != NULL); 5890b69c2f0Sahrens *(tail+1) = '\0'; 5900b69c2f0Sahrens ASSERT3U(strlen(newpath) + strlen(nm), <, sizeof (newpath)); 591fa9e4066Sahrens (void) strcat(newpath, nm); 592fa9e4066Sahrens refstr_rele(pathref); 593*d7de0ceaSRobert Harris vfs_setmntpoint(vfsp, newpath, 0); 594fa9e4066Sahrens 595fa9e4066Sahrens pathref = vfs_getresource(vfsp); 5960b69c2f0Sahrens (void) strncpy(newpath, refstr_value(pathref), sizeof (newpath)); 5970b69c2f0Sahrens VERIFY((tail = strrchr(newpath, '@')) != NULL); 5980b69c2f0Sahrens *(tail+1) = '\0'; 5990b69c2f0Sahrens ASSERT3U(strlen(newpath) + strlen(nm), <, sizeof (newpath)); 600fa9e4066Sahrens (void) strcat(newpath, nm); 601fa9e4066Sahrens refstr_rele(pathref); 602*d7de0ceaSRobert Harris vfs_setresource(vfsp, newpath, 0); 603fa9e4066Sahrens 604fa9e4066Sahrens vfs_unlock(vfsp); 605fa9e4066Sahrens } 606fa9e4066Sahrens 607da6c28aaSamw /*ARGSUSED*/ 608fa9e4066Sahrens static int 609fa9e4066Sahrens zfsctl_snapdir_rename(vnode_t *sdvp, char *snm, vnode_t *tdvp, char *tnm, 610da6c28aaSamw cred_t *cr, caller_context_t *ct, int flags) 611fa9e4066Sahrens { 612fa9e4066Sahrens zfsctl_snapdir_t *sdp = sdvp->v_data; 613fa9e4066Sahrens zfs_snapentry_t search, *sep; 614ab04eb8eStimh zfsvfs_t *zfsvfs; 615fa9e4066Sahrens avl_index_t where; 616fa9e4066Sahrens char from[MAXNAMELEN], to[MAXNAMELEN]; 617ab04eb8eStimh char real[MAXNAMELEN]; 618fa9e4066Sahrens int err; 619fa9e4066Sahrens 620ab04eb8eStimh zfsvfs = sdvp->v_vfsp->vfs_data; 621ab04eb8eStimh ZFS_ENTER(zfsvfs); 622ab04eb8eStimh 623ab04eb8eStimh if ((flags & FIGNORECASE) || zfsvfs->z_case == ZFS_CASE_INSENSITIVE) { 624ab04eb8eStimh err = dmu_snapshot_realname(zfsvfs->z_os, snm, real, 625ab04eb8eStimh MAXNAMELEN, NULL); 626ab04eb8eStimh if (err == 0) { 627ab04eb8eStimh snm = real; 628ab04eb8eStimh } else if (err != ENOTSUP) { 629ab04eb8eStimh ZFS_EXIT(zfsvfs); 630ab04eb8eStimh return (err); 631ab04eb8eStimh } 632ab04eb8eStimh } 633ab04eb8eStimh 634ab04eb8eStimh ZFS_EXIT(zfsvfs); 635ecd6cf80Smarks 636ab04eb8eStimh err = zfsctl_snapshot_zname(sdvp, snm, MAXNAMELEN, from); 637ab04eb8eStimh if (!err) 638ab04eb8eStimh err = zfsctl_snapshot_zname(tdvp, tnm, MAXNAMELEN, to); 639ab04eb8eStimh if (!err) 640ab04eb8eStimh err = zfs_secpolicy_rename_perms(from, to, cr); 641fa9e4066Sahrens if (err) 642fa9e4066Sahrens return (err); 643fa9e4066Sahrens 644fa9e4066Sahrens /* 645fa9e4066Sahrens * Cannot move snapshots out of the snapdir. 646fa9e4066Sahrens */ 647fa9e4066Sahrens if (sdvp != tdvp) 648fa9e4066Sahrens return (EINVAL); 649fa9e4066Sahrens 650fa9e4066Sahrens if (strcmp(snm, tnm) == 0) 651fa9e4066Sahrens return (0); 652fa9e4066Sahrens 653fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 654fa9e4066Sahrens 655fa9e4066Sahrens search.se_name = (char *)snm; 6565422900bSmaybee if ((sep = avl_find(&sdp->sd_snaps, &search, &where)) == NULL) { 6575422900bSmaybee mutex_exit(&sdp->sd_lock); 6585422900bSmaybee return (ENOENT); 659fa9e4066Sahrens } 660fa9e4066Sahrens 661cdf5b4caSmmusante err = dmu_objset_rename(from, to, B_FALSE); 6625422900bSmaybee if (err == 0) 6635422900bSmaybee zfsctl_rename_snap(sdp, sep, tnm); 664fa9e4066Sahrens 665fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 666fa9e4066Sahrens 667fa9e4066Sahrens return (err); 668fa9e4066Sahrens } 669fa9e4066Sahrens 670fa9e4066Sahrens /* ARGSUSED */ 671fa9e4066Sahrens static int 672da6c28aaSamw zfsctl_snapdir_remove(vnode_t *dvp, char *name, vnode_t *cwd, cred_t *cr, 673da6c28aaSamw caller_context_t *ct, int flags) 674fa9e4066Sahrens { 675fa9e4066Sahrens zfsctl_snapdir_t *sdp = dvp->v_data; 6768bf40bf0Sck zfs_snapentry_t *sep; 6778bf40bf0Sck zfs_snapentry_t search; 678ab04eb8eStimh zfsvfs_t *zfsvfs; 679fa9e4066Sahrens char snapname[MAXNAMELEN]; 680ab04eb8eStimh char real[MAXNAMELEN]; 681fa9e4066Sahrens int err; 682fa9e4066Sahrens 683ab04eb8eStimh zfsvfs = dvp->v_vfsp->vfs_data; 684ab04eb8eStimh ZFS_ENTER(zfsvfs); 685ab04eb8eStimh 686ab04eb8eStimh if ((flags & FIGNORECASE) || zfsvfs->z_case == ZFS_CASE_INSENSITIVE) { 687ab04eb8eStimh 688ab04eb8eStimh err = dmu_snapshot_realname(zfsvfs->z_os, name, real, 689ab04eb8eStimh MAXNAMELEN, NULL); 690ab04eb8eStimh if (err == 0) { 691ab04eb8eStimh name = real; 692ab04eb8eStimh } else if (err != ENOTSUP) { 693ab04eb8eStimh ZFS_EXIT(zfsvfs); 694ab04eb8eStimh return (err); 695ab04eb8eStimh } 696ab04eb8eStimh } 697ab04eb8eStimh 698ab04eb8eStimh ZFS_EXIT(zfsvfs); 699ab04eb8eStimh 7005422900bSmaybee err = zfsctl_snapshot_zname(dvp, name, MAXNAMELEN, snapname); 701ab04eb8eStimh if (!err) 702ab04eb8eStimh err = zfs_secpolicy_destroy_perms(snapname, cr); 7035422900bSmaybee if (err) 7045422900bSmaybee return (err); 705ecd6cf80Smarks 706fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 707fa9e4066Sahrens 7088bf40bf0Sck search.se_name = name; 7098bf40bf0Sck sep = avl_find(&sdp->sd_snaps, &search, NULL); 7108bf40bf0Sck if (sep) { 7118bf40bf0Sck avl_remove(&sdp->sd_snaps, sep); 7128bf40bf0Sck err = zfsctl_unmount_snap(sep, MS_FORCE, cr); 7138bf40bf0Sck if (err) 7148bf40bf0Sck avl_add(&sdp->sd_snaps, sep); 7158bf40bf0Sck else 716842727c2SChris Kirby err = dmu_objset_destroy(snapname, B_FALSE); 7178bf40bf0Sck } else { 7188bf40bf0Sck err = ENOENT; 719fa9e4066Sahrens } 720fa9e4066Sahrens 721fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 722fa9e4066Sahrens 723fa9e4066Sahrens return (err); 724fa9e4066Sahrens } 725fa9e4066Sahrens 726f18faf3fSek /* 727f18faf3fSek * This creates a snapshot under '.zfs/snapshot'. 728f18faf3fSek */ 729ecd6cf80Smarks /* ARGSUSED */ 730ecd6cf80Smarks static int 731ecd6cf80Smarks zfsctl_snapdir_mkdir(vnode_t *dvp, char *dirname, vattr_t *vap, vnode_t **vpp, 732da6c28aaSamw cred_t *cr, caller_context_t *cc, int flags, vsecattr_t *vsecp) 733ecd6cf80Smarks { 734ecd6cf80Smarks zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data; 735ecd6cf80Smarks char name[MAXNAMELEN]; 736ecd6cf80Smarks int err; 737ecd6cf80Smarks static enum symfollow follow = NO_FOLLOW; 738ecd6cf80Smarks static enum uio_seg seg = UIO_SYSSPACE; 739ecd6cf80Smarks 7406d1e0b89Smarks if (snapshot_namecheck(dirname, NULL, NULL) != 0) 7416d1e0b89Smarks return (EILSEQ); 7426d1e0b89Smarks 743ecd6cf80Smarks dmu_objset_name(zfsvfs->z_os, name); 744ecd6cf80Smarks 745ecd6cf80Smarks *vpp = NULL; 746ecd6cf80Smarks 747ecd6cf80Smarks err = zfs_secpolicy_snapshot_perms(name, cr); 748ecd6cf80Smarks if (err) 749ecd6cf80Smarks return (err); 750ecd6cf80Smarks 751ecd6cf80Smarks if (err == 0) { 752ea2f5b9eSMatthew Ahrens err = dmu_objset_snapshot(name, dirname, NULL, B_FALSE); 753ecd6cf80Smarks if (err) 754ecd6cf80Smarks return (err); 755ecd6cf80Smarks err = lookupnameat(dirname, seg, follow, NULL, vpp, dvp); 756ecd6cf80Smarks } 757ecd6cf80Smarks 758ecd6cf80Smarks return (err); 759ecd6cf80Smarks } 760ecd6cf80Smarks 761fa9e4066Sahrens /* 762fa9e4066Sahrens * Lookup entry point for the 'snapshot' directory. Try to open the 763fa9e4066Sahrens * snapshot if it exist, creating the pseudo filesystem vnode as necessary. 764fa9e4066Sahrens * Perform a mount of the associated dataset on top of the vnode. 765fa9e4066Sahrens */ 766fa9e4066Sahrens /* ARGSUSED */ 767fa9e4066Sahrens static int 768fa9e4066Sahrens zfsctl_snapdir_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, pathname_t *pnp, 769da6c28aaSamw int flags, vnode_t *rdir, cred_t *cr, caller_context_t *ct, 770da6c28aaSamw int *direntflags, pathname_t *realpnp) 771fa9e4066Sahrens { 772fa9e4066Sahrens zfsctl_snapdir_t *sdp = dvp->v_data; 773fa9e4066Sahrens objset_t *snap; 774fa9e4066Sahrens char snapname[MAXNAMELEN]; 775ab04eb8eStimh char real[MAXNAMELEN]; 776fa9e4066Sahrens char *mountpoint; 777fa9e4066Sahrens zfs_snapentry_t *sep, search; 778fa9e4066Sahrens struct mounta margs; 779fa9e4066Sahrens vfs_t *vfsp; 780fa9e4066Sahrens size_t mountpoint_len; 781fa9e4066Sahrens avl_index_t where; 782fa9e4066Sahrens zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data; 783fa9e4066Sahrens int err; 784fa9e4066Sahrens 785da6c28aaSamw /* 786da6c28aaSamw * No extended attributes allowed under .zfs 787da6c28aaSamw */ 788da6c28aaSamw if (flags & LOOKUP_XATTR) 789da6c28aaSamw return (EINVAL); 790da6c28aaSamw 791fa9e4066Sahrens ASSERT(dvp->v_type == VDIR); 792fa9e4066Sahrens 793fa9e4066Sahrens /* 794fa9e4066Sahrens * If we get a recursive call, that means we got called 795fa9e4066Sahrens * from the domount() code while it was trying to look up the 796fa9e4066Sahrens * spec (which looks like a local path for zfs). We need to 797fa9e4066Sahrens * add some flag to domount() to tell it not to do this lookup. 798fa9e4066Sahrens */ 799fa9e4066Sahrens if (MUTEX_HELD(&sdp->sd_lock)) 800fa9e4066Sahrens return (ENOENT); 801fa9e4066Sahrens 802fa9e4066Sahrens ZFS_ENTER(zfsvfs); 803fa9e4066Sahrens 804142ae85dSChris Kirby if (gfs_lookup_dot(vpp, dvp, zfsvfs->z_ctldir, nm) == 0) { 805142ae85dSChris Kirby ZFS_EXIT(zfsvfs); 806142ae85dSChris Kirby return (0); 807142ae85dSChris Kirby } 808142ae85dSChris Kirby 809ab04eb8eStimh if (flags & FIGNORECASE) { 810ab04eb8eStimh boolean_t conflict = B_FALSE; 811ab04eb8eStimh 812ab04eb8eStimh err = dmu_snapshot_realname(zfsvfs->z_os, nm, real, 813ab04eb8eStimh MAXNAMELEN, &conflict); 814ab04eb8eStimh if (err == 0) { 815ab04eb8eStimh nm = real; 816ab04eb8eStimh } else if (err != ENOTSUP) { 817ab04eb8eStimh ZFS_EXIT(zfsvfs); 818ab04eb8eStimh return (err); 819ab04eb8eStimh } 820ab04eb8eStimh if (realpnp) 821ab04eb8eStimh (void) strlcpy(realpnp->pn_buf, nm, 822ab04eb8eStimh realpnp->pn_bufsize); 823ab04eb8eStimh if (conflict && direntflags) 824ab04eb8eStimh *direntflags = ED_CASE_CONFLICT; 825ab04eb8eStimh } 826ab04eb8eStimh 827fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 828fa9e4066Sahrens search.se_name = (char *)nm; 829fa9e4066Sahrens if ((sep = avl_find(&sdp->sd_snaps, &search, &where)) != NULL) { 830fa9e4066Sahrens *vpp = sep->se_root; 831fa9e4066Sahrens VN_HOLD(*vpp); 832bbf4a8dfSmaybee err = traverse(vpp); 833bbf4a8dfSmaybee if (err) { 834bbf4a8dfSmaybee VN_RELE(*vpp); 835bbf4a8dfSmaybee *vpp = NULL; 836bbf4a8dfSmaybee } else if (*vpp == sep->se_root) { 837bbf4a8dfSmaybee /* 838bbf4a8dfSmaybee * The snapshot was unmounted behind our backs, 839bbf4a8dfSmaybee * try to remount it. 840bbf4a8dfSmaybee */ 841fa9e4066Sahrens goto domount; 8428bf40bf0Sck } else { 8438bf40bf0Sck /* 8448bf40bf0Sck * VROOT was set during the traverse call. We need 8458bf40bf0Sck * to clear it since we're pretending to be part 8468bf40bf0Sck * of our parent's vfs. 8478bf40bf0Sck */ 8488bf40bf0Sck (*vpp)->v_flag &= ~VROOT; 849bb963f1cSmaybee } 850fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 851fa9e4066Sahrens ZFS_EXIT(zfsvfs); 852bbf4a8dfSmaybee return (err); 853fa9e4066Sahrens } 854fa9e4066Sahrens 855fa9e4066Sahrens /* 856fa9e4066Sahrens * The requested snapshot is not currently mounted, look it up. 857fa9e4066Sahrens */ 8585422900bSmaybee err = zfsctl_snapshot_zname(dvp, nm, MAXNAMELEN, snapname); 8595422900bSmaybee if (err) { 8605422900bSmaybee mutex_exit(&sdp->sd_lock); 8615422900bSmaybee ZFS_EXIT(zfsvfs); 8622283022cSmarks /* 8632283022cSmarks * handle "ls *" or "?" in a graceful manner, 8642283022cSmarks * forcing EILSEQ to ENOENT. 8652283022cSmarks * Since shell ultimately passes "*" or "?" as name to lookup 8662283022cSmarks */ 8672283022cSmarks return (err == EILSEQ ? ENOENT : err); 8685422900bSmaybee } 869503ad85cSMatthew Ahrens if (dmu_objset_hold(snapname, FTAG, &snap) != 0) { 870fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 871fa9e4066Sahrens ZFS_EXIT(zfsvfs); 872fa9e4066Sahrens return (ENOENT); 873fa9e4066Sahrens } 874fa9e4066Sahrens 875fa9e4066Sahrens sep = kmem_alloc(sizeof (zfs_snapentry_t), KM_SLEEP); 876fa9e4066Sahrens sep->se_name = kmem_alloc(strlen(nm) + 1, KM_SLEEP); 877fa9e4066Sahrens (void) strcpy(sep->se_name, nm); 878fa9e4066Sahrens *vpp = sep->se_root = zfsctl_snapshot_mknode(dvp, dmu_objset_id(snap)); 879fa9e4066Sahrens avl_insert(&sdp->sd_snaps, sep, where); 880fa9e4066Sahrens 881503ad85cSMatthew Ahrens dmu_objset_rele(snap, FTAG); 882fa9e4066Sahrens domount: 883fa9e4066Sahrens mountpoint_len = strlen(refstr_value(dvp->v_vfsp->vfs_mntpt)) + 884fa9e4066Sahrens strlen("/.zfs/snapshot/") + strlen(nm) + 1; 885fa9e4066Sahrens mountpoint = kmem_alloc(mountpoint_len, KM_SLEEP); 886fa9e4066Sahrens (void) snprintf(mountpoint, mountpoint_len, "%s/.zfs/snapshot/%s", 887fa9e4066Sahrens refstr_value(dvp->v_vfsp->vfs_mntpt), nm); 888fa9e4066Sahrens 889fa9e4066Sahrens margs.spec = snapname; 890fa9e4066Sahrens margs.dir = mountpoint; 891fa9e4066Sahrens margs.flags = MS_SYSSPACE | MS_NOMNTTAB; 892fa9e4066Sahrens margs.fstype = "zfs"; 893fa9e4066Sahrens margs.dataptr = NULL; 894fa9e4066Sahrens margs.datalen = 0; 895fa9e4066Sahrens margs.optptr = NULL; 896fa9e4066Sahrens margs.optlen = 0; 897fa9e4066Sahrens 898fa9e4066Sahrens err = domount("zfs", &margs, *vpp, kcred, &vfsp); 899fa9e4066Sahrens kmem_free(mountpoint, mountpoint_len); 900fa9e4066Sahrens 90195c9592aSmaybee if (err == 0) { 90295c9592aSmaybee /* 90395c9592aSmaybee * Return the mounted root rather than the covered mount point. 904f18faf3fSek * Takes the GFS vnode at .zfs/snapshot/<snapname> and returns 905f18faf3fSek * the ZFS vnode mounted on top of the GFS node. This ZFS 906142ae85dSChris Kirby * vnode is the root of the newly created vfsp. 90795c9592aSmaybee */ 90895c9592aSmaybee VFS_RELE(vfsp); 90995c9592aSmaybee err = traverse(vpp); 91095c9592aSmaybee } 911fa9e4066Sahrens 91295c9592aSmaybee if (err == 0) { 91395c9592aSmaybee /* 914f18faf3fSek * Fix up the root vnode mounted on .zfs/snapshot/<snapname>. 915ed097989Sek * 916ed097989Sek * This is where we lie about our v_vfsp in order to 917f18faf3fSek * make .zfs/snapshot/<snapname> accessible over NFS 918f18faf3fSek * without requiring manual mounts of <snapname>. 91995c9592aSmaybee */ 92095c9592aSmaybee ASSERT(VTOZ(*vpp)->z_zfsvfs != zfsvfs); 92195c9592aSmaybee VTOZ(*vpp)->z_zfsvfs->z_parent = zfsvfs; 92295c9592aSmaybee (*vpp)->v_vfsp = zfsvfs->z_vfs; 92395c9592aSmaybee (*vpp)->v_flag &= ~VROOT; 92495c9592aSmaybee } 925fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 926fa9e4066Sahrens ZFS_EXIT(zfsvfs); 927fa9e4066Sahrens 928bb963f1cSmaybee /* 929bb963f1cSmaybee * If we had an error, drop our hold on the vnode and 930bb963f1cSmaybee * zfsctl_snapshot_inactive() will clean up. 931bb963f1cSmaybee */ 932bb963f1cSmaybee if (err) { 93395c9592aSmaybee VN_RELE(*vpp); 934bb963f1cSmaybee *vpp = NULL; 935bb963f1cSmaybee } 93695c9592aSmaybee return (err); 937fa9e4066Sahrens } 938fa9e4066Sahrens 939743a77edSAlan Wright /* ARGSUSED */ 940743a77edSAlan Wright static int 941743a77edSAlan Wright zfsctl_shares_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, pathname_t *pnp, 942743a77edSAlan Wright int flags, vnode_t *rdir, cred_t *cr, caller_context_t *ct, 943743a77edSAlan Wright int *direntflags, pathname_t *realpnp) 944743a77edSAlan Wright { 945743a77edSAlan Wright zfsvfs_t *zfsvfs = dvp->v_vfsp->vfs_data; 946743a77edSAlan Wright znode_t *dzp; 947743a77edSAlan Wright int error; 948743a77edSAlan Wright 949743a77edSAlan Wright ZFS_ENTER(zfsvfs); 950743a77edSAlan Wright 951743a77edSAlan Wright if (gfs_lookup_dot(vpp, dvp, zfsvfs->z_ctldir, nm) == 0) { 952743a77edSAlan Wright ZFS_EXIT(zfsvfs); 953743a77edSAlan Wright return (0); 954743a77edSAlan Wright } 955743a77edSAlan Wright 9569e1320c0SMark Shellenbaum if (zfsvfs->z_shares_dir == 0) { 9579e1320c0SMark Shellenbaum ZFS_EXIT(zfsvfs); 9589e1320c0SMark Shellenbaum return (ENOTSUP); 9599e1320c0SMark Shellenbaum } 960743a77edSAlan Wright if ((error = zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp)) == 0) 961743a77edSAlan Wright error = VOP_LOOKUP(ZTOV(dzp), nm, vpp, pnp, 962743a77edSAlan Wright flags, rdir, cr, ct, direntflags, realpnp); 963743a77edSAlan Wright 964743a77edSAlan Wright VN_RELE(ZTOV(dzp)); 965743a77edSAlan Wright ZFS_EXIT(zfsvfs); 966743a77edSAlan Wright 967743a77edSAlan Wright return (error); 968743a77edSAlan Wright } 969743a77edSAlan Wright 970fa9e4066Sahrens /* ARGSUSED */ 971fa9e4066Sahrens static int 972b38f0970Sck zfsctl_snapdir_readdir_cb(vnode_t *vp, void *dp, int *eofp, 973b38f0970Sck offset_t *offp, offset_t *nextp, void *data, int flags) 974fa9e4066Sahrens { 975fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 976fa9e4066Sahrens char snapname[MAXNAMELEN]; 977fa9e4066Sahrens uint64_t id, cookie; 978b38f0970Sck boolean_t case_conflict; 979b38f0970Sck int error; 980fa9e4066Sahrens 981fa9e4066Sahrens ZFS_ENTER(zfsvfs); 982fa9e4066Sahrens 983fa9e4066Sahrens cookie = *offp; 984b38f0970Sck error = dmu_snapshot_list_next(zfsvfs->z_os, MAXNAMELEN, snapname, &id, 985b38f0970Sck &cookie, &case_conflict); 986b38f0970Sck if (error) { 987fa9e4066Sahrens ZFS_EXIT(zfsvfs); 988b38f0970Sck if (error == ENOENT) { 989b38f0970Sck *eofp = 1; 990b38f0970Sck return (0); 991b38f0970Sck } 992b38f0970Sck return (error); 993fa9e4066Sahrens } 994fa9e4066Sahrens 995b38f0970Sck if (flags & V_RDDIR_ENTFLAGS) { 996b38f0970Sck edirent_t *eodp = dp; 997b38f0970Sck 998b38f0970Sck (void) strcpy(eodp->ed_name, snapname); 999b38f0970Sck eodp->ed_ino = ZFSCTL_INO_SNAP(id); 1000b38f0970Sck eodp->ed_eflags = case_conflict ? ED_CASE_CONFLICT : 0; 1001b38f0970Sck } else { 1002b38f0970Sck struct dirent64 *odp = dp; 1003b38f0970Sck 1004b38f0970Sck (void) strcpy(odp->d_name, snapname); 1005b38f0970Sck odp->d_ino = ZFSCTL_INO_SNAP(id); 1006b38f0970Sck } 1007fa9e4066Sahrens *nextp = cookie; 1008fa9e4066Sahrens 1009fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1010fa9e4066Sahrens 1011fa9e4066Sahrens return (0); 1012fa9e4066Sahrens } 1013fa9e4066Sahrens 1014743a77edSAlan Wright /* ARGSUSED */ 1015743a77edSAlan Wright static int 1016743a77edSAlan Wright zfsctl_shares_readdir(vnode_t *vp, uio_t *uiop, cred_t *cr, int *eofp, 1017743a77edSAlan Wright caller_context_t *ct, int flags) 1018743a77edSAlan Wright { 1019743a77edSAlan Wright zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 1020743a77edSAlan Wright znode_t *dzp; 1021743a77edSAlan Wright int error; 1022743a77edSAlan Wright 1023743a77edSAlan Wright ZFS_ENTER(zfsvfs); 1024743a77edSAlan Wright 10259e1320c0SMark Shellenbaum if (zfsvfs->z_shares_dir == 0) { 10269e1320c0SMark Shellenbaum ZFS_EXIT(zfsvfs); 10279e1320c0SMark Shellenbaum return (ENOTSUP); 10289e1320c0SMark Shellenbaum } 1029743a77edSAlan Wright if ((error = zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp)) == 0) { 1030743a77edSAlan Wright error = VOP_READDIR(ZTOV(dzp), uiop, cr, eofp, ct, flags); 1031743a77edSAlan Wright VN_RELE(ZTOV(dzp)); 1032743a77edSAlan Wright } else { 1033743a77edSAlan Wright *eofp = 1; 1034743a77edSAlan Wright error = ENOENT; 1035743a77edSAlan Wright } 1036743a77edSAlan Wright 1037743a77edSAlan Wright ZFS_EXIT(zfsvfs); 1038743a77edSAlan Wright return (error); 1039743a77edSAlan Wright } 1040743a77edSAlan Wright 1041f18faf3fSek /* 1042f18faf3fSek * pvp is the '.zfs' directory (zfsctl_node_t). 1043f18faf3fSek * Creates vp, which is '.zfs/snapshot' (zfsctl_snapdir_t). 1044f18faf3fSek * 1045f18faf3fSek * This function is the callback to create a GFS vnode for '.zfs/snapshot' 1046f18faf3fSek * when a lookup is performed on .zfs for "snapshot". 1047f18faf3fSek */ 1048fa9e4066Sahrens vnode_t * 1049fa9e4066Sahrens zfsctl_mknode_snapdir(vnode_t *pvp) 1050fa9e4066Sahrens { 1051fa9e4066Sahrens vnode_t *vp; 1052fa9e4066Sahrens zfsctl_snapdir_t *sdp; 1053fa9e4066Sahrens 1054fa9e4066Sahrens vp = gfs_dir_create(sizeof (zfsctl_snapdir_t), pvp, 1055fa9e4066Sahrens zfsctl_ops_snapdir, NULL, NULL, MAXNAMELEN, 1056fa9e4066Sahrens zfsctl_snapdir_readdir_cb, NULL); 1057fa9e4066Sahrens sdp = vp->v_data; 1058fa9e4066Sahrens sdp->sd_node.zc_id = ZFSCTL_INO_SNAPDIR; 1059a32fded1Sek sdp->sd_node.zc_cmtime = ((zfsctl_node_t *)pvp->v_data)->zc_cmtime; 1060fa9e4066Sahrens mutex_init(&sdp->sd_lock, NULL, MUTEX_DEFAULT, NULL); 1061fa9e4066Sahrens avl_create(&sdp->sd_snaps, snapentry_compare, 1062fa9e4066Sahrens sizeof (zfs_snapentry_t), offsetof(zfs_snapentry_t, se_node)); 1063fa9e4066Sahrens return (vp); 1064fa9e4066Sahrens } 1065fa9e4066Sahrens 1066743a77edSAlan Wright vnode_t * 1067743a77edSAlan Wright zfsctl_mknode_shares(vnode_t *pvp) 1068743a77edSAlan Wright { 1069743a77edSAlan Wright vnode_t *vp; 1070743a77edSAlan Wright zfsctl_node_t *sdp; 1071743a77edSAlan Wright 1072743a77edSAlan Wright vp = gfs_dir_create(sizeof (zfsctl_node_t), pvp, 1073743a77edSAlan Wright zfsctl_ops_shares, NULL, NULL, MAXNAMELEN, 1074743a77edSAlan Wright NULL, NULL); 1075743a77edSAlan Wright sdp = vp->v_data; 1076743a77edSAlan Wright sdp->zc_cmtime = ((zfsctl_node_t *)pvp->v_data)->zc_cmtime; 1077743a77edSAlan Wright return (vp); 1078743a77edSAlan Wright 1079743a77edSAlan Wright } 1080743a77edSAlan Wright 1081743a77edSAlan Wright /* ARGSUSED */ 1082743a77edSAlan Wright static int 1083743a77edSAlan Wright zfsctl_shares_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr, 1084743a77edSAlan Wright caller_context_t *ct) 1085743a77edSAlan Wright { 1086743a77edSAlan Wright zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 1087743a77edSAlan Wright znode_t *dzp; 1088743a77edSAlan Wright int error; 1089743a77edSAlan Wright 1090743a77edSAlan Wright ZFS_ENTER(zfsvfs); 10919e1320c0SMark Shellenbaum if (zfsvfs->z_shares_dir == 0) { 10929e1320c0SMark Shellenbaum ZFS_EXIT(zfsvfs); 10939e1320c0SMark Shellenbaum return (ENOTSUP); 10949e1320c0SMark Shellenbaum } 1095743a77edSAlan Wright if ((error = zfs_zget(zfsvfs, zfsvfs->z_shares_dir, &dzp)) == 0) { 1096743a77edSAlan Wright error = VOP_GETATTR(ZTOV(dzp), vap, flags, cr, ct); 1097743a77edSAlan Wright VN_RELE(ZTOV(dzp)); 1098743a77edSAlan Wright } 1099743a77edSAlan Wright ZFS_EXIT(zfsvfs); 1100743a77edSAlan Wright return (error); 1101743a77edSAlan Wright 1102743a77edSAlan Wright 1103743a77edSAlan Wright } 1104743a77edSAlan Wright 1105fa9e4066Sahrens /* ARGSUSED */ 1106fa9e4066Sahrens static int 1107da6c28aaSamw zfsctl_snapdir_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr, 1108da6c28aaSamw caller_context_t *ct) 1109fa9e4066Sahrens { 1110fa9e4066Sahrens zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data; 1111fa9e4066Sahrens zfsctl_snapdir_t *sdp = vp->v_data; 1112fa9e4066Sahrens 1113fa9e4066Sahrens ZFS_ENTER(zfsvfs); 1114fa9e4066Sahrens zfsctl_common_getattr(vp, vap); 1115fa9e4066Sahrens vap->va_nodeid = gfs_file_inode(vp); 1116fa9e4066Sahrens vap->va_nlink = vap->va_size = avl_numnodes(&sdp->sd_snaps) + 2; 111771eb0538SChris Kirby vap->va_ctime = vap->va_mtime = dmu_objset_snap_cmtime(zfsvfs->z_os); 1118fa9e4066Sahrens ZFS_EXIT(zfsvfs); 1119fa9e4066Sahrens 1120fa9e4066Sahrens return (0); 1121fa9e4066Sahrens } 1122fa9e4066Sahrens 1123bb963f1cSmaybee /* ARGSUSED */ 1124fa9e4066Sahrens static void 1125da6c28aaSamw zfsctl_snapdir_inactive(vnode_t *vp, cred_t *cr, caller_context_t *ct) 1126fa9e4066Sahrens { 1127fa9e4066Sahrens zfsctl_snapdir_t *sdp = vp->v_data; 1128bb963f1cSmaybee void *private; 1129bb963f1cSmaybee 1130bb963f1cSmaybee private = gfs_dir_inactive(vp); 1131bb963f1cSmaybee if (private != NULL) { 1132bb963f1cSmaybee ASSERT(avl_numnodes(&sdp->sd_snaps) == 0); 1133bb963f1cSmaybee mutex_destroy(&sdp->sd_lock); 1134bb963f1cSmaybee avl_destroy(&sdp->sd_snaps); 1135bb963f1cSmaybee kmem_free(private, sizeof (zfsctl_snapdir_t)); 1136bb963f1cSmaybee } 1137fa9e4066Sahrens } 1138fa9e4066Sahrens 1139fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapdir[] = { 1140aa59c4cbSrsb { VOPNAME_OPEN, { .vop_open = zfsctl_common_open } }, 1141aa59c4cbSrsb { VOPNAME_CLOSE, { .vop_close = zfsctl_common_close } }, 1142aa59c4cbSrsb { VOPNAME_IOCTL, { .error = fs_inval } }, 1143aa59c4cbSrsb { VOPNAME_GETATTR, { .vop_getattr = zfsctl_snapdir_getattr } }, 1144aa59c4cbSrsb { VOPNAME_ACCESS, { .vop_access = zfsctl_common_access } }, 1145aa59c4cbSrsb { VOPNAME_RENAME, { .vop_rename = zfsctl_snapdir_rename } }, 1146aa59c4cbSrsb { VOPNAME_RMDIR, { .vop_rmdir = zfsctl_snapdir_remove } }, 1147ecd6cf80Smarks { VOPNAME_MKDIR, { .vop_mkdir = zfsctl_snapdir_mkdir } }, 1148aa59c4cbSrsb { VOPNAME_READDIR, { .vop_readdir = gfs_vop_readdir } }, 1149aa59c4cbSrsb { VOPNAME_LOOKUP, { .vop_lookup = zfsctl_snapdir_lookup } }, 1150aa59c4cbSrsb { VOPNAME_SEEK, { .vop_seek = fs_seek } }, 1151aa59c4cbSrsb { VOPNAME_INACTIVE, { .vop_inactive = zfsctl_snapdir_inactive } }, 1152aa59c4cbSrsb { VOPNAME_FID, { .vop_fid = zfsctl_common_fid } }, 1153fa9e4066Sahrens { NULL } 1154fa9e4066Sahrens }; 1155fa9e4066Sahrens 1156743a77edSAlan Wright static const fs_operation_def_t zfsctl_tops_shares[] = { 1157743a77edSAlan Wright { VOPNAME_OPEN, { .vop_open = zfsctl_common_open } }, 1158743a77edSAlan Wright { VOPNAME_CLOSE, { .vop_close = zfsctl_common_close } }, 1159743a77edSAlan Wright { VOPNAME_IOCTL, { .error = fs_inval } }, 1160743a77edSAlan Wright { VOPNAME_GETATTR, { .vop_getattr = zfsctl_shares_getattr } }, 1161743a77edSAlan Wright { VOPNAME_ACCESS, { .vop_access = zfsctl_common_access } }, 1162743a77edSAlan Wright { VOPNAME_READDIR, { .vop_readdir = zfsctl_shares_readdir } }, 1163743a77edSAlan Wright { VOPNAME_LOOKUP, { .vop_lookup = zfsctl_shares_lookup } }, 1164743a77edSAlan Wright { VOPNAME_SEEK, { .vop_seek = fs_seek } }, 1165743a77edSAlan Wright { VOPNAME_INACTIVE, { .vop_inactive = gfs_vop_inactive } }, 1166743a77edSAlan Wright { VOPNAME_FID, { .vop_fid = zfsctl_shares_fid } }, 1167743a77edSAlan Wright { NULL } 1168743a77edSAlan Wright }; 1169743a77edSAlan Wright 1170f18faf3fSek /* 1171f18faf3fSek * pvp is the GFS vnode '.zfs/snapshot'. 1172f18faf3fSek * 1173f18faf3fSek * This creates a GFS node under '.zfs/snapshot' representing each 1174f18faf3fSek * snapshot. This newly created GFS node is what we mount snapshot 1175f18faf3fSek * vfs_t's ontop of. 1176f18faf3fSek */ 1177fa9e4066Sahrens static vnode_t * 1178fa9e4066Sahrens zfsctl_snapshot_mknode(vnode_t *pvp, uint64_t objset) 1179fa9e4066Sahrens { 1180fa9e4066Sahrens vnode_t *vp; 1181fa9e4066Sahrens zfsctl_node_t *zcp; 1182fa9e4066Sahrens 1183fa9e4066Sahrens vp = gfs_dir_create(sizeof (zfsctl_node_t), pvp, 1184fa9e4066Sahrens zfsctl_ops_snapshot, NULL, NULL, MAXNAMELEN, NULL, NULL); 1185fa9e4066Sahrens zcp = vp->v_data; 1186fa9e4066Sahrens zcp->zc_id = objset; 1187fa9e4066Sahrens 1188fa9e4066Sahrens return (vp); 1189fa9e4066Sahrens } 1190fa9e4066Sahrens 1191fa9e4066Sahrens static void 1192da6c28aaSamw zfsctl_snapshot_inactive(vnode_t *vp, cred_t *cr, caller_context_t *ct) 1193fa9e4066Sahrens { 1194fa9e4066Sahrens zfsctl_snapdir_t *sdp; 1195fa9e4066Sahrens zfs_snapentry_t *sep, *next; 1196fa9e4066Sahrens vnode_t *dvp; 1197fa9e4066Sahrens 1198ab04eb8eStimh VERIFY(gfs_dir_lookup(vp, "..", &dvp, cr, 0, NULL, NULL) == 0); 1199fa9e4066Sahrens sdp = dvp->v_data; 1200fa9e4066Sahrens 1201fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 1202fa9e4066Sahrens 1203fa9e4066Sahrens if (vp->v_count > 1) { 1204fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 1205fa9e4066Sahrens return; 1206fa9e4066Sahrens } 1207fa9e4066Sahrens ASSERT(!vn_ismntpt(vp)); 1208fa9e4066Sahrens 1209fa9e4066Sahrens sep = avl_first(&sdp->sd_snaps); 1210fa9e4066Sahrens while (sep != NULL) { 1211fa9e4066Sahrens next = AVL_NEXT(&sdp->sd_snaps, sep); 1212fa9e4066Sahrens 1213fa9e4066Sahrens if (sep->se_root == vp) { 1214fa9e4066Sahrens avl_remove(&sdp->sd_snaps, sep); 1215fa9e4066Sahrens kmem_free(sep->se_name, strlen(sep->se_name) + 1); 1216fa9e4066Sahrens kmem_free(sep, sizeof (zfs_snapentry_t)); 1217fa9e4066Sahrens break; 1218fa9e4066Sahrens } 1219fa9e4066Sahrens sep = next; 1220fa9e4066Sahrens } 1221fa9e4066Sahrens ASSERT(sep != NULL); 1222fa9e4066Sahrens 1223fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 1224fa9e4066Sahrens VN_RELE(dvp); 1225fa9e4066Sahrens 1226bb963f1cSmaybee /* 1227bb963f1cSmaybee * Dispose of the vnode for the snapshot mount point. 1228bb963f1cSmaybee * This is safe to do because once this entry has been removed 1229bb963f1cSmaybee * from the AVL tree, it can't be found again, so cannot become 1230bb963f1cSmaybee * "active". If we lookup the same name again we will end up 1231bb963f1cSmaybee * creating a new vnode. 1232bb963f1cSmaybee */ 1233da6c28aaSamw gfs_vop_inactive(vp, cr, ct); 1234fa9e4066Sahrens } 1235fa9e4066Sahrens 1236fa9e4066Sahrens 1237fa9e4066Sahrens /* 1238fa9e4066Sahrens * These VP's should never see the light of day. They should always 1239fa9e4066Sahrens * be covered. 1240fa9e4066Sahrens */ 1241fa9e4066Sahrens static const fs_operation_def_t zfsctl_tops_snapshot[] = { 1242aa59c4cbSrsb VOPNAME_INACTIVE, { .vop_inactive = zfsctl_snapshot_inactive }, 1243fa9e4066Sahrens NULL, NULL 1244fa9e4066Sahrens }; 1245fa9e4066Sahrens 1246fa9e4066Sahrens int 1247fa9e4066Sahrens zfsctl_lookup_objset(vfs_t *vfsp, uint64_t objsetid, zfsvfs_t **zfsvfsp) 1248fa9e4066Sahrens { 1249fa9e4066Sahrens zfsvfs_t *zfsvfs = vfsp->vfs_data; 1250fa9e4066Sahrens vnode_t *dvp, *vp; 1251fa9e4066Sahrens zfsctl_snapdir_t *sdp; 1252fa9e4066Sahrens zfsctl_node_t *zcp; 1253fa9e4066Sahrens zfs_snapentry_t *sep; 1254fa9e4066Sahrens int error; 1255fa9e4066Sahrens 1256fa9e4066Sahrens ASSERT(zfsvfs->z_ctldir != NULL); 1257fa9e4066Sahrens error = zfsctl_root_lookup(zfsvfs->z_ctldir, "snapshot", &dvp, 1258da6c28aaSamw NULL, 0, NULL, kcred, NULL, NULL, NULL); 1259fa9e4066Sahrens if (error != 0) 1260fa9e4066Sahrens return (error); 1261fa9e4066Sahrens sdp = dvp->v_data; 1262fa9e4066Sahrens 1263fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 1264fa9e4066Sahrens sep = avl_first(&sdp->sd_snaps); 1265fa9e4066Sahrens while (sep != NULL) { 1266fa9e4066Sahrens vp = sep->se_root; 1267fa9e4066Sahrens zcp = vp->v_data; 1268fa9e4066Sahrens if (zcp->zc_id == objsetid) 1269fa9e4066Sahrens break; 1270fa9e4066Sahrens 1271fa9e4066Sahrens sep = AVL_NEXT(&sdp->sd_snaps, sep); 1272fa9e4066Sahrens } 1273fa9e4066Sahrens 1274fa9e4066Sahrens if (sep != NULL) { 1275fa9e4066Sahrens VN_HOLD(vp); 1276f18faf3fSek /* 1277f18faf3fSek * Return the mounted root rather than the covered mount point. 1278f18faf3fSek * Takes the GFS vnode at .zfs/snapshot/<snapshot objsetid> 1279f18faf3fSek * and returns the ZFS vnode mounted on top of the GFS node. 1280f18faf3fSek * This ZFS vnode is the root of the vfs for objset 'objsetid'. 1281f18faf3fSek */ 1282fa9e4066Sahrens error = traverse(&vp); 1283bbf4a8dfSmaybee if (error == 0) { 1284bbf4a8dfSmaybee if (vp == sep->se_root) 1285bbf4a8dfSmaybee error = EINVAL; 1286bbf4a8dfSmaybee else 1287bbf4a8dfSmaybee *zfsvfsp = VTOZ(vp)->z_zfsvfs; 1288bbf4a8dfSmaybee } 1289fea70b54Snd mutex_exit(&sdp->sd_lock); 1290fa9e4066Sahrens VN_RELE(vp); 1291fa9e4066Sahrens } else { 1292fa9e4066Sahrens error = EINVAL; 1293fea70b54Snd mutex_exit(&sdp->sd_lock); 1294fa9e4066Sahrens } 1295fa9e4066Sahrens 1296fa9e4066Sahrens VN_RELE(dvp); 1297fa9e4066Sahrens 1298fa9e4066Sahrens return (error); 1299fa9e4066Sahrens } 1300fa9e4066Sahrens 1301fa9e4066Sahrens /* 1302fa9e4066Sahrens * Unmount any snapshots for the given filesystem. This is called from 1303fa9e4066Sahrens * zfs_umount() - if we have a ctldir, then go through and unmount all the 1304fa9e4066Sahrens * snapshots. 1305fa9e4066Sahrens */ 1306fa9e4066Sahrens int 1307fa9e4066Sahrens zfsctl_umount_snapshots(vfs_t *vfsp, int fflags, cred_t *cr) 1308fa9e4066Sahrens { 1309fa9e4066Sahrens zfsvfs_t *zfsvfs = vfsp->vfs_data; 13108bf40bf0Sck vnode_t *dvp; 1311fa9e4066Sahrens zfsctl_snapdir_t *sdp; 1312fa9e4066Sahrens zfs_snapentry_t *sep, *next; 1313fa9e4066Sahrens int error; 1314fa9e4066Sahrens 1315fa9e4066Sahrens ASSERT(zfsvfs->z_ctldir != NULL); 1316fa9e4066Sahrens error = zfsctl_root_lookup(zfsvfs->z_ctldir, "snapshot", &dvp, 1317da6c28aaSamw NULL, 0, NULL, cr, NULL, NULL, NULL); 1318fa9e4066Sahrens if (error != 0) 1319fa9e4066Sahrens return (error); 1320fa9e4066Sahrens sdp = dvp->v_data; 1321fa9e4066Sahrens 1322fa9e4066Sahrens mutex_enter(&sdp->sd_lock); 1323fa9e4066Sahrens 1324fa9e4066Sahrens sep = avl_first(&sdp->sd_snaps); 1325fa9e4066Sahrens while (sep != NULL) { 1326fa9e4066Sahrens next = AVL_NEXT(&sdp->sd_snaps, sep); 1327fa9e4066Sahrens 1328fa9e4066Sahrens /* 1329fa9e4066Sahrens * If this snapshot is not mounted, then it must 1330fa9e4066Sahrens * have just been unmounted by somebody else, and 1331fa9e4066Sahrens * will be cleaned up by zfsctl_snapdir_inactive(). 1332fa9e4066Sahrens */ 13338bf40bf0Sck if (vn_ismntpt(sep->se_root)) { 13348bf40bf0Sck avl_remove(&sdp->sd_snaps, sep); 13358bf40bf0Sck error = zfsctl_unmount_snap(sep, fflags, cr); 1336fa9e4066Sahrens if (error) { 13378bf40bf0Sck avl_add(&sdp->sd_snaps, sep); 13388bf40bf0Sck break; 1339fa9e4066Sahrens } 1340fa9e4066Sahrens } 1341fa9e4066Sahrens sep = next; 1342fa9e4066Sahrens } 13438bf40bf0Sck 1344fa9e4066Sahrens mutex_exit(&sdp->sd_lock); 1345fa9e4066Sahrens VN_RELE(dvp); 1346fa9e4066Sahrens 1347fa9e4066Sahrens return (error); 1348fa9e4066Sahrens } 1349