| /* |
| * CDDL HEADER START |
| * |
| * The contents of this file are subject to the terms of the |
| * Common Development and Distribution License (the "License"). |
| * You may not use this file except in compliance with the License. |
| * |
| * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE |
| * or http://www.opensolaris.org/os/licensing. |
| * See the License for the specific language governing permissions |
| * and limitations under the License. |
| * |
| * When distributing Covered Code, include this CDDL HEADER in each |
| * file and include the License file at usr/src/OPENSOLARIS.LICENSE. |
| * If applicable, add the following below this CDDL HEADER, with the |
| * fields enclosed by brackets "[]" replaced with your own identifying |
| * information: Portions Copyright [yyyy] [name of copyright owner] |
| * |
| * CDDL HEADER END |
| */ |
| |
| /* |
| * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
| * Copyright (c) 2013, 2016 by Delphix. All rights reserved. |
| * Copyright 2017 Nexenta Systems, Inc. |
| */ |
| |
| #include <sys/types.h> |
| #include <sys/param.h> |
| #include <sys/time.h> |
| #include <sys/sysmacros.h> |
| #include <sys/vfs.h> |
| #include <sys/vnode.h> |
| #include <sys/file.h> |
| #include <sys/mode.h> |
| #include <sys/kmem.h> |
| #include <sys/uio.h> |
| #include <sys/pathname.h> |
| #include <sys/cmn_err.h> |
| #include <sys/errno.h> |
| #include <sys/stat.h> |
| #include <sys/sunddi.h> |
| #include <sys/random.h> |
| #include <sys/policy.h> |
| #include <sys/zfs_dir.h> |
| #include <sys/zfs_acl.h> |
| #include <sys/zfs_vnops.h> |
| #include <sys/fs/zfs.h> |
| #include <sys/zap.h> |
| #include <sys/dmu.h> |
| #include <sys/atomic.h> |
| #include <sys/zfs_ctldir.h> |
| #include <sys/zfs_fuid.h> |
| #include <sys/sa.h> |
| #include <sys/zfs_sa.h> |
| |
| /* |
| * zfs_match_find() is used by zfs_dirent_lock() to perform zap lookups |
| * of names after deciding which is the appropriate lookup interface. |
| */ |
| static int |
| zfs_match_find(zfsvfs_t *zfsvfs, znode_t *dzp, char *name, matchtype_t mt, |
| boolean_t update, int *deflags, pathname_t *rpnp, uint64_t *zoid) |
| { |
| boolean_t conflict = B_FALSE; |
| int error; |
| |
| if (zfsvfs->z_norm) { |
| size_t bufsz = 0; |
| char *buf = NULL; |
| |
| if (rpnp) { |
| buf = rpnp->pn_buf; |
| bufsz = rpnp->pn_bufsize; |
| } |
| |
| /* |
| * In the non-mixed case we only expect there would ever |
| * be one match, but we need to use the normalizing lookup. |
| */ |
| error = zap_lookup_norm(zfsvfs->z_os, dzp->z_id, name, 8, 1, |
| zoid, mt, buf, bufsz, &conflict); |
| } else { |
| error = zap_lookup(zfsvfs->z_os, dzp->z_id, name, 8, 1, zoid); |
| } |
| |
| /* |
| * Allow multiple entries provided the first entry is |
| * the object id. Non-zpl consumers may safely make |
| * use of the additional space. |
| * |
| * XXX: This should be a feature flag for compatibility |
| */ |
| if (error == EOVERFLOW) |
| error = 0; |
| |
| if (zfsvfs->z_norm && !error && deflags) |
| *deflags = conflict ? ED_CASE_CONFLICT : 0; |
| |
| *zoid = ZFS_DIRENT_OBJ(*zoid); |
| |
| return (error); |
| } |
| |
| /* |
| * Lock a directory entry. A dirlock on <dzp, name> protects that name |
| * in dzp's directory zap object. As long as you hold a dirlock, you can |
| * assume two things: (1) dzp cannot be reaped, and (2) no other thread |
| * can change the zap entry for (i.e. link or unlink) this name. |
| * |
| * Input arguments: |
| * dzp - znode for directory |
| * name - name of entry to lock |
| * flag - ZNEW: if the entry already exists, fail with EEXIST. |
| * ZEXISTS: if the entry does not exist, fail with ENOENT. |
| * ZSHARED: allow concurrent access with other ZSHARED callers. |
| * ZXATTR: we want dzp's xattr directory |
| * ZCILOOK: On a mixed sensitivity file system, |
| * this lookup should be case-insensitive. |
| * ZCIEXACT: On a purely case-insensitive file system, |
| * this lookup should be case-sensitive. |
| * ZRENAMING: we are locking for renaming, force narrow locks |
| * ZHAVELOCK: Don't grab the z_name_lock for this call. The |
| * current thread already holds it. |
| * |
| * Output arguments: |
| * zpp - pointer to the znode for the entry (NULL if there isn't one) |
| * dlpp - pointer to the dirlock for this entry (NULL on error) |
| * direntflags - (case-insensitive lookup only) |
| * flags if multiple case-sensitive matches exist in directory |
| * realpnp - (case-insensitive lookup only) |
| * actual name matched within the directory |
| * |
| * Return value: 0 on success or errno on failure. |
| * |
| * NOTE: Always checks for, and rejects, '.' and '..'. |
| * NOTE: For case-insensitive file systems we take wide locks (see below), |
| * but return znode pointers to a single match. |
| */ |
| int |
| zfs_dirent_lock(zfs_dirlock_t **dlpp, znode_t *dzp, char *name, znode_t **zpp, |
| int flag, int *direntflags, pathname_t *realpnp) |
| { |
| zfsvfs_t *zfsvfs = ZTOZSB(dzp); |
| zfs_dirlock_t *dl; |
| boolean_t update; |
| matchtype_t mt = 0; |
| uint64_t zoid; |
| int error = 0; |
| int cmpflags; |
| |
| *zpp = NULL; |
| *dlpp = NULL; |
| |
| /* |
| * Verify that we are not trying to lock '.', '..', or '.zfs' |
| */ |
| if ((name[0] == '.' && |
| (name[1] == '\0' || (name[1] == '.' && name[2] == '\0'))) || |
| (zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0)) |
| return (SET_ERROR(EEXIST)); |
| |
| /* |
| * Case sensitivity and normalization preferences are set when |
| * the file system is created. These are stored in the |
| * zfsvfs->z_case and zfsvfs->z_norm fields. These choices |
| * affect what vnodes can be cached in the DNLC, how we |
| * perform zap lookups, and the "width" of our dirlocks. |
| * |
| * A normal dirlock locks a single name. Note that with |
| * normalization a name can be composed multiple ways, but |
| * when normalized, these names all compare equal. A wide |
| * dirlock locks multiple names. We need these when the file |
| * system is supporting mixed-mode access. It is sometimes |
| * necessary to lock all case permutations of file name at |
| * once so that simultaneous case-insensitive/case-sensitive |
| * behaves as rationally as possible. |
| */ |
| |
| /* |
| * When matching we may need to normalize & change case according to |
| * FS settings. |
| * |
| * Note that a normalized match is necessary for a case insensitive |
| * filesystem when the lookup request is not exact because normalization |
| * can fold case independent of normalizing code point sequences. |
| * |
| * See the table above zfs_dropname(). |
| */ |
| if (zfsvfs->z_norm != 0) { |
| mt = MT_NORMALIZE; |
| |
| /* |
| * Determine if the match needs to honor the case specified in |
| * lookup, and if so keep track of that so that during |
| * normalization we don't fold case. |
| */ |
| if ((zfsvfs->z_case == ZFS_CASE_INSENSITIVE && |
| (flag & ZCIEXACT)) || |
| (zfsvfs->z_case == ZFS_CASE_MIXED && !(flag & ZCILOOK))) { |
| mt |= MT_MATCH_CASE; |
| } |
| } |
| |
| /* |
| * Only look in or update the DNLC if we are looking for the |
| * name on a file system that does not require normalization |
| * or case folding. We can also look there if we happen to be |
| * on a non-normalizing, mixed sensitivity file system IF we |
| * are looking for the exact name. |
| * |
| * Maybe can add TO-UPPERed version of name to dnlc in ci-only |
| * case for performance improvement? |
| */ |
| update = !zfsvfs->z_norm || |
| (zfsvfs->z_case == ZFS_CASE_MIXED && |
| !(zfsvfs->z_norm & ~U8_TEXTPREP_TOUPPER) && !(flag & ZCILOOK)); |
| |
| /* |
| * ZRENAMING indicates we are in a situation where we should |
| * take narrow locks regardless of the file system's |
| * preferences for normalizing and case folding. This will |
| * prevent us deadlocking trying to grab the same wide lock |
| * twice if the two names happen to be case-insensitive |
| * matches. |
| */ |
| if (flag & ZRENAMING) |
| cmpflags = 0; |
| else |
| cmpflags = zfsvfs->z_norm; |
| |
| /* |
| * Wait until there are no locks on this name. |
| * |
| * Don't grab the lock if it is already held. However, cannot |
| * have both ZSHARED and ZHAVELOCK together. |
| */ |
| ASSERT(!(flag & ZSHARED) || !(flag & ZHAVELOCK)); |
| if (!(flag & ZHAVELOCK)) |
| rw_enter(&dzp->z_name_lock, RW_READER); |
| |
| mutex_enter(&dzp->z_lock); |
| for (;;) { |
| if (dzp->z_unlinked && !(flag & ZXATTR)) { |
| mutex_exit(&dzp->z_lock); |
| if (!(flag & ZHAVELOCK)) |
| rw_exit(&dzp->z_name_lock); |
| return (SET_ERROR(ENOENT)); |
| } |
| for (dl = dzp->z_dirlocks; dl != NULL; dl = dl->dl_next) { |
| if ((u8_strcmp(name, dl->dl_name, 0, cmpflags, |
| U8_UNICODE_LATEST, &error) == 0) || error != 0) |
| break; |
| } |
| if (error != 0) { |
| mutex_exit(&dzp->z_lock); |
| if (!(flag & ZHAVELOCK)) |
| rw_exit(&dzp->z_name_lock); |
| return (SET_ERROR(ENOENT)); |
| } |
| if (dl == NULL) { |
| /* |
| * Allocate a new dirlock and add it to the list. |
| */ |
| dl = kmem_alloc(sizeof (zfs_dirlock_t), KM_SLEEP); |
| cv_init(&dl->dl_cv, NULL, CV_DEFAULT, NULL); |
| dl->dl_name = name; |
| dl->dl_sharecnt = 0; |
| dl->dl_namelock = 0; |
| dl->dl_namesize = 0; |
| dl->dl_dzp = dzp; |
| dl->dl_next = dzp->z_dirlocks; |
| dzp->z_dirlocks = dl; |
| break; |
| } |
| if ((flag & ZSHARED) && dl->dl_sharecnt != 0) |
| break; |
| cv_wait(&dl->dl_cv, &dzp->z_lock); |
| } |
| |
| /* |
| * If the z_name_lock was NOT held for this dirlock record it. |
| */ |
| if (flag & ZHAVELOCK) |
| dl->dl_namelock = 1; |
| |
| if ((flag & ZSHARED) && ++dl->dl_sharecnt > 1 && dl->dl_namesize == 0) { |
| /* |
| * We're the second shared reference to dl. Make a copy of |
| * dl_name in case the first thread goes away before we do. |
| * Note that we initialize the new name before storing its |
| * pointer into dl_name, because the first thread may load |
| * dl->dl_name at any time. It'll either see the old value, |
| * which belongs to it, or the new shared copy; either is OK. |
| */ |
| dl->dl_namesize = strlen(dl->dl_name) + 1; |
| name = kmem_alloc(dl->dl_namesize, KM_SLEEP); |
| bcopy(dl->dl_name, name, dl->dl_namesize); |
| dl->dl_name = name; |
| } |
| |
| mutex_exit(&dzp->z_lock); |
| |
| /* |
| * We have a dirlock on the name. (Note that it is the dirlock, |
| * not the dzp's z_lock, that protects the name in the zap object.) |
| * See if there's an object by this name; if so, put a hold on it. |
| */ |
| if (flag & ZXATTR) { |
| error = sa_lookup(dzp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), &zoid, |
| sizeof (zoid)); |
| if (error == 0) |
| error = (zoid == 0 ? SET_ERROR(ENOENT) : 0); |
| } else { |
| error = zfs_match_find(zfsvfs, dzp, name, mt, |
| update, direntflags, realpnp, &zoid); |
| } |
| if (error) { |
| if (error != ENOENT || (flag & ZEXISTS)) { |
| zfs_dirent_unlock(dl); |
| return (error); |
| } |
| } else { |
| if (flag & ZNEW) { |
| zfs_dirent_unlock(dl); |
| return (SET_ERROR(EEXIST)); |
| } |
| error = zfs_zget(zfsvfs, zoid, zpp); |
| if (error) { |
| zfs_dirent_unlock(dl); |
| return (error); |
| } |
| } |
| |
| *dlpp = dl; |
| |
| return (0); |
| } |
| |
| /* |
| * Unlock this directory entry and wake anyone who was waiting for it. |
| */ |
| void |
| zfs_dirent_unlock(zfs_dirlock_t *dl) |
| { |
| znode_t *dzp = dl->dl_dzp; |
| zfs_dirlock_t **prev_dl, *cur_dl; |
| |
| mutex_enter(&dzp->z_lock); |
| |
| if (!dl->dl_namelock) |
| rw_exit(&dzp->z_name_lock); |
| |
| if (dl->dl_sharecnt > 1) { |
| dl->dl_sharecnt--; |
| mutex_exit(&dzp->z_lock); |
| return; |
| } |
| prev_dl = &dzp->z_dirlocks; |
| while ((cur_dl = *prev_dl) != dl) |
| prev_dl = &cur_dl->dl_next; |
| *prev_dl = dl->dl_next; |
| cv_broadcast(&dl->dl_cv); |
| mutex_exit(&dzp->z_lock); |
| |
| if (dl->dl_namesize != 0) |
| kmem_free(dl->dl_name, dl->dl_namesize); |
| cv_destroy(&dl->dl_cv); |
| kmem_free(dl, sizeof (*dl)); |
| } |
| |
| /* |
| * Look up an entry in a directory. |
| * |
| * NOTE: '.' and '..' are handled as special cases because |
| * no directory entries are actually stored for them. If this is |
| * the root of a filesystem, then '.zfs' is also treated as a |
| * special pseudo-directory. |
| */ |
| int |
| zfs_dirlook(znode_t *dzp, char *name, struct inode **ipp, int flags, |
| int *deflg, pathname_t *rpnp) |
| { |
| zfs_dirlock_t *dl; |
| znode_t *zp; |
| int error = 0; |
| uint64_t parent; |
| |
| if (name[0] == 0 || (name[0] == '.' && name[1] == 0)) { |
| *ipp = ZTOI(dzp); |
| igrab(*ipp); |
| } else if (name[0] == '.' && name[1] == '.' && name[2] == 0) { |
| zfsvfs_t *zfsvfs = ZTOZSB(dzp); |
| |
| /* |
| * If we are a snapshot mounted under .zfs, return |
| * the inode pointer for the snapshot directory. |
| */ |
| if ((error = sa_lookup(dzp->z_sa_hdl, |
| SA_ZPL_PARENT(zfsvfs), &parent, sizeof (parent))) != 0) |
| return (error); |
| |
| if (parent == dzp->z_id && zfsvfs->z_parent != zfsvfs) { |
| error = zfsctl_root_lookup(zfsvfs->z_parent->z_ctldir, |
| "snapshot", ipp, 0, kcred, NULL, NULL); |
| return (error); |
| } |
| rw_enter(&dzp->z_parent_lock, RW_READER); |
| error = zfs_zget(zfsvfs, parent, &zp); |
| if (error == 0) |
| *ipp = ZTOI(zp); |
| rw_exit(&dzp->z_parent_lock); |
| } else if (zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0) { |
| *ipp = zfsctl_root(dzp); |
| } else { |
| int zf; |
| |
| zf = ZEXISTS | ZSHARED; |
| if (flags & FIGNORECASE) |
| zf |= ZCILOOK; |
| |
| error = zfs_dirent_lock(&dl, dzp, name, &zp, zf, deflg, rpnp); |
| if (error == 0) { |
| *ipp = ZTOI(zp); |
| zfs_dirent_unlock(dl); |
| dzp->z_zn_prefetch = B_TRUE; /* enable prefetching */ |
| } |
| rpnp = NULL; |
| } |
| |
| if ((flags & FIGNORECASE) && rpnp && !error) |
| (void) strlcpy(rpnp->pn_buf, name, rpnp->pn_bufsize); |
| |
| return (error); |
| } |
| |
| /* |
| * unlinked Set (formerly known as the "delete queue") Error Handling |
| * |
| * When dealing with the unlinked set, we dmu_tx_hold_zap(), but we |
| * don't specify the name of the entry that we will be manipulating. We |
| * also fib and say that we won't be adding any new entries to the |
| * unlinked set, even though we might (this is to lower the minimum file |
| * size that can be deleted in a full filesystem). So on the small |
| * chance that the nlink list is using a fat zap (ie. has more than |
| * 2000 entries), we *may* not pre-read a block that's needed. |
| * Therefore it is remotely possible for some of the assertions |
| * regarding the unlinked set below to fail due to i/o error. On a |
| * nondebug system, this will result in the space being leaked. |
| */ |
| void |
| zfs_unlinked_add(znode_t *zp, dmu_tx_t *tx) |
| { |
| zfsvfs_t *zfsvfs = ZTOZSB(zp); |
| |
| ASSERT(zp->z_unlinked); |
| ASSERT(ZTOI(zp)->i_nlink == 0); |
| |
| VERIFY3U(0, ==, |
| zap_add_int(zfsvfs->z_os, zfsvfs->z_unlinkedobj, zp->z_id, tx)); |
| |
| dataset_kstats_update_nunlinks_kstat(&zfsvfs->z_kstat, 1); |
| } |
| |
| /* |
| * Clean up any znodes that had no links when we either crashed or |
| * (force) umounted the file system. |
| */ |
| static void |
| zfs_unlinked_drain_task(void *arg) |
| { |
| zfsvfs_t *zfsvfs = arg; |
| zap_cursor_t zc; |
| zap_attribute_t zap; |
| dmu_object_info_t doi; |
| znode_t *zp; |
| int error; |
| |
| ASSERT3B(zfsvfs->z_draining, ==, B_TRUE); |
| |
| /* |
| * Iterate over the contents of the unlinked set. |
| */ |
| for (zap_cursor_init(&zc, zfsvfs->z_os, zfsvfs->z_unlinkedobj); |
| zap_cursor_retrieve(&zc, &zap) == 0 && !zfsvfs->z_drain_cancel; |
| zap_cursor_advance(&zc)) { |
| |
| /* |
| * See what kind of object we have in list |
| */ |
| |
| error = dmu_object_info(zfsvfs->z_os, |
| zap.za_first_integer, &doi); |
| if (error != 0) |
| continue; |
| |
| ASSERT((doi.doi_type == DMU_OT_PLAIN_FILE_CONTENTS) || |
| (doi.doi_type == DMU_OT_DIRECTORY_CONTENTS)); |
| /* |
| * We need to re-mark these list entries for deletion, |
| * so we pull them back into core and set zp->z_unlinked. |
| */ |
| error = zfs_zget(zfsvfs, zap.za_first_integer, &zp); |
| |
| /* |
| * We may pick up znodes that are already marked for deletion. |
| * This could happen during the purge of an extended attribute |
| * directory. All we need to do is skip over them, since they |
| * are already in the system marked z_unlinked. |
| */ |
| if (error != 0) |
| continue; |
| |
| zp->z_unlinked = B_TRUE; |
| |
| /* |
| * iput() is Linux's equivalent to illumos' VN_RELE(). It will |
| * decrement the inode's ref count and may cause the inode to be |
| * synchronously freed. We interrupt freeing of this inode, by |
| * checking the return value of dmu_objset_zfs_unmounting() in |
| * dmu_free_long_range(), when an unmount is requested. |
| */ |
| iput(ZTOI(zp)); |
| ASSERT3B(zfsvfs->z_unmounted, ==, B_FALSE); |
| } |
| zap_cursor_fini(&zc); |
| |
| zfsvfs->z_draining = B_FALSE; |
| zfsvfs->z_drain_task = TASKQID_INVALID; |
| } |
| |
| /* |
| * Sets z_draining then tries to dispatch async unlinked drain. |
| * If that fails executes synchronous unlinked drain. |
| */ |
| void |
| zfs_unlinked_drain(zfsvfs_t *zfsvfs) |
| { |
| ASSERT3B(zfsvfs->z_unmounted, ==, B_FALSE); |
| ASSERT3B(zfsvfs->z_draining, ==, B_FALSE); |
| |
| zfsvfs->z_draining = B_TRUE; |
| zfsvfs->z_drain_cancel = B_FALSE; |
| |
| zfsvfs->z_drain_task = taskq_dispatch( |
| dsl_pool_unlinked_drain_taskq(dmu_objset_pool(zfsvfs->z_os)), |
| zfs_unlinked_drain_task, zfsvfs, TQ_SLEEP); |
| if (zfsvfs->z_drain_task == TASKQID_INVALID) { |
| zfs_dbgmsg("async zfs_unlinked_drain dispatch failed"); |
| zfs_unlinked_drain_task(zfsvfs); |
| } |
| } |
| |
| /* |
| * Wait for the unlinked drain taskq task to stop. This will interrupt the |
| * unlinked set processing if it is in progress. |
| */ |
| void |
| zfs_unlinked_drain_stop_wait(zfsvfs_t *zfsvfs) |
| { |
| ASSERT3B(zfsvfs->z_unmounted, ==, B_FALSE); |
| |
| if (zfsvfs->z_draining) { |
| zfsvfs->z_drain_cancel = B_TRUE; |
| taskq_cancel_id(dsl_pool_unlinked_drain_taskq( |
| dmu_objset_pool(zfsvfs->z_os)), zfsvfs->z_drain_task); |
| zfsvfs->z_drain_task = TASKQID_INVALID; |
| zfsvfs->z_draining = B_FALSE; |
| } |
| } |
| |
| /* |
| * Delete the entire contents of a directory. Return a count |
| * of the number of entries that could not be deleted. If we encounter |
| * an error, return a count of at least one so that the directory stays |
| * in the unlinked set. |
| * |
| * NOTE: this function assumes that the directory is inactive, |
| * so there is no need to lock its entries before deletion. |
| * Also, it assumes the directory contents is *only* regular |
| * files. |
| */ |
| static int |
| zfs_purgedir(znode_t *dzp) |
| { |
| zap_cursor_t zc; |
| zap_attribute_t zap; |
| znode_t *xzp; |
| dmu_tx_t *tx; |
| zfsvfs_t *zfsvfs = ZTOZSB(dzp); |
| zfs_dirlock_t dl; |
| int skipped = 0; |
| int error; |
| |
| for (zap_cursor_init(&zc, zfsvfs->z_os, dzp->z_id); |
| (error = zap_cursor_retrieve(&zc, &zap)) == 0; |
| zap_cursor_advance(&zc)) { |
| error = zfs_zget(zfsvfs, |
| ZFS_DIRENT_OBJ(zap.za_first_integer), &xzp); |
| if (error) { |
| skipped += 1; |
| continue; |
| } |
| |
| ASSERT(S_ISREG(ZTOI(xzp)->i_mode) || |
| S_ISLNK(ZTOI(xzp)->i_mode)); |
| |
| tx = dmu_tx_create(zfsvfs->z_os); |
| dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE); |
| dmu_tx_hold_zap(tx, dzp->z_id, FALSE, zap.za_name); |
| dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE); |
| dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL); |
| /* Is this really needed ? */ |
| zfs_sa_upgrade_txholds(tx, xzp); |
| dmu_tx_mark_netfree(tx); |
| error = dmu_tx_assign(tx, TXG_WAIT); |
| if (error) { |
| dmu_tx_abort(tx); |
| zfs_iput_async(ZTOI(xzp)); |
| skipped += 1; |
| continue; |
| } |
| bzero(&dl, sizeof (dl)); |
| dl.dl_dzp = dzp; |
| dl.dl_name = zap.za_name; |
| |
| error = zfs_link_destroy(&dl, xzp, tx, 0, NULL); |
| if (error) |
| skipped += 1; |
| dmu_tx_commit(tx); |
| |
| zfs_iput_async(ZTOI(xzp)); |
| } |
| zap_cursor_fini(&zc); |
| if (error != ENOENT) |
| skipped += 1; |
| return (skipped); |
| } |
| |
| void |
| zfs_rmnode(znode_t *zp) |
| { |
| zfsvfs_t *zfsvfs = ZTOZSB(zp); |
| objset_t *os = zfsvfs->z_os; |
| znode_t *xzp = NULL; |
| dmu_tx_t *tx; |
| uint64_t acl_obj; |
| uint64_t xattr_obj; |
| uint64_t links; |
| int error; |
| |
| ASSERT(ZTOI(zp)->i_nlink == 0); |
| ASSERT(atomic_read(&ZTOI(zp)->i_count) == 0); |
| |
| /* |
| * If this is an attribute directory, purge its contents. |
| */ |
| if (S_ISDIR(ZTOI(zp)->i_mode) && (zp->z_pflags & ZFS_XATTR)) { |
| if (zfs_purgedir(zp) != 0) { |
| /* |
| * Not enough space to delete some xattrs. |
| * Leave it in the unlinked set. |
| */ |
| zfs_znode_dmu_fini(zp); |
| |
| return; |
| } |
| } |
| |
| /* |
| * Free up all the data in the file. We don't do this for directories |
| * because we need truncate and remove to be in the same tx, like in |
| * zfs_znode_delete(). Otherwise, if we crash here we'll end up with |
| * an inconsistent truncated zap object in the delete queue. Note a |
| * truncated file is harmless since it only contains user data. |
| */ |
| if (S_ISREG(ZTOI(zp)->i_mode)) { |
| error = dmu_free_long_range(os, zp->z_id, 0, DMU_OBJECT_END); |
| if (error) { |
| /* |
| * Not enough space or we were interrupted by unmount. |
| * Leave the file in the unlinked set. |
| */ |
| zfs_znode_dmu_fini(zp); |
| return; |
| } |
| } |
| |
| /* |
| * If the file has extended attributes, we're going to unlink |
| * the xattr dir. |
| */ |
| error = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), |
| &xattr_obj, sizeof (xattr_obj)); |
| if (error == 0 && xattr_obj) { |
| error = zfs_zget(zfsvfs, xattr_obj, &xzp); |
| ASSERT(error == 0); |
| } |
| |
| acl_obj = zfs_external_acl(zp); |
| |
| /* |
| * Set up the final transaction. |
| */ |
| tx = dmu_tx_create(os); |
| dmu_tx_hold_free(tx, zp->z_id, 0, DMU_OBJECT_END); |
| dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL); |
| if (xzp) { |
| dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, TRUE, NULL); |
| dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE); |
| } |
| if (acl_obj) |
| dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END); |
| |
| zfs_sa_upgrade_txholds(tx, zp); |
| error = dmu_tx_assign(tx, TXG_WAIT); |
| if (error) { |
| /* |
| * Not enough space to delete the file. Leave it in the |
| * unlinked set, leaking it until the fs is remounted (at |
| * which point we'll call zfs_unlinked_drain() to process it). |
| */ |
| dmu_tx_abort(tx); |
| zfs_znode_dmu_fini(zp); |
| goto out; |
| } |
| |
| if (xzp) { |
| ASSERT(error == 0); |
| mutex_enter(&xzp->z_lock); |
| xzp->z_unlinked = B_TRUE; /* mark xzp for deletion */ |
| clear_nlink(ZTOI(xzp)); /* no more links to it */ |
| links = 0; |
| VERIFY(0 == sa_update(xzp->z_sa_hdl, SA_ZPL_LINKS(zfsvfs), |
| &links, sizeof (links), tx)); |
| mutex_exit(&xzp->z_lock); |
| zfs_unlinked_add(xzp, tx); |
| } |
| |
| /* Remove this znode from the unlinked set */ |
| VERIFY3U(0, ==, |
| zap_remove_int(zfsvfs->z_os, zfsvfs->z_unlinkedobj, zp->z_id, tx)); |
| |
| dataset_kstats_update_nunlinked_kstat(&zfsvfs->z_kstat, 1); |
| |
| zfs_znode_delete(zp, tx); |
| |
| dmu_tx_commit(tx); |
| out: |
| if (xzp) |
| zfs_iput_async(ZTOI(xzp)); |
| } |
| |
| static uint64_t |
| zfs_dirent(znode_t *zp, uint64_t mode) |
| { |
| uint64_t de = zp->z_id; |
| |
| if (ZTOZSB(zp)->z_version >= ZPL_VERSION_DIRENT_TYPE) |
| de |= IFTODT(mode) << 60; |
| return (de); |
| } |
| |
| /* |
| * Link zp into dl. Can fail in the following cases : |
| * - if zp has been unlinked. |
| * - if the number of entries with the same hash (aka. colliding entries) |
| * exceed the capacity of a leaf-block of fatzap and splitting of the |
| * leaf-block does not help. |
| */ |
| int |
| zfs_link_create(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag) |
| { |
| znode_t *dzp = dl->dl_dzp; |
| zfsvfs_t *zfsvfs = ZTOZSB(zp); |
| uint64_t value; |
| int zp_is_dir = S_ISDIR(ZTOI(zp)->i_mode); |
| sa_bulk_attr_t bulk[5]; |
| uint64_t mtime[2], ctime[2]; |
| uint64_t links; |
| int count = 0; |
| int error; |
| |
| mutex_enter(&zp->z_lock); |
| |
| if (!(flag & ZRENAMING)) { |
| if (zp->z_unlinked) { /* no new links to unlinked zp */ |
| ASSERT(!(flag & (ZNEW | ZEXISTS))); |
| mutex_exit(&zp->z_lock); |
| return (SET_ERROR(ENOENT)); |
| } |
| if (!(flag & ZNEW)) { |
| /* |
| * ZNEW nodes come from zfs_mknode() where the link |
| * count has already been initialised |
| */ |
| inc_nlink(ZTOI(zp)); |
| links = ZTOI(zp)->i_nlink; |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), |
| NULL, &links, sizeof (links)); |
| } |
| } |
| |
| value = zfs_dirent(zp, zp->z_mode); |
| error = zap_add(ZTOZSB(zp)->z_os, dzp->z_id, dl->dl_name, 8, 1, |
| &value, tx); |
| |
| /* |
| * zap_add could fail to add the entry if it exceeds the capacity of the |
| * leaf-block and zap_leaf_split() failed to help. |
| * The caller of this routine is responsible for failing the transaction |
| * which will rollback the SA updates done above. |
| */ |
| if (error != 0) { |
| if (!(flag & ZRENAMING) && !(flag & ZNEW)) |
| drop_nlink(ZTOI(zp)); |
| mutex_exit(&zp->z_lock); |
| return (error); |
| } |
| |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL, |
| &dzp->z_id, sizeof (dzp->z_id)); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, |
| &zp->z_pflags, sizeof (zp->z_pflags)); |
| |
| if (!(flag & ZNEW)) { |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, |
| ctime, sizeof (ctime)); |
| zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime, |
| ctime); |
| } |
| error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx); |
| ASSERT(error == 0); |
| |
| mutex_exit(&zp->z_lock); |
| |
| mutex_enter(&dzp->z_lock); |
| dzp->z_size++; |
| if (zp_is_dir) |
| inc_nlink(ZTOI(dzp)); |
| links = ZTOI(dzp)->i_nlink; |
| count = 0; |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL, |
| &dzp->z_size, sizeof (dzp->z_size)); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL, |
| &links, sizeof (links)); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, |
| mtime, sizeof (mtime)); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, |
| ctime, sizeof (ctime)); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, |
| &dzp->z_pflags, sizeof (dzp->z_pflags)); |
| zfs_tstamp_update_setup(dzp, CONTENT_MODIFIED, mtime, ctime); |
| error = sa_bulk_update(dzp->z_sa_hdl, bulk, count, tx); |
| ASSERT(error == 0); |
| mutex_exit(&dzp->z_lock); |
| |
| return (0); |
| } |
| |
| /* |
| * The match type in the code for this function should conform to: |
| * |
| * ------------------------------------------------------------------------ |
| * fs type | z_norm | lookup type | match type |
| * ---------|-------------|-------------|---------------------------------- |
| * CS !norm | 0 | 0 | 0 (exact) |
| * CS norm | formX | 0 | MT_NORMALIZE |
| * CI !norm | upper | !ZCIEXACT | MT_NORMALIZE |
| * CI !norm | upper | ZCIEXACT | MT_NORMALIZE | MT_MATCH_CASE |
| * CI norm | upper|formX | !ZCIEXACT | MT_NORMALIZE |
| * CI norm | upper|formX | ZCIEXACT | MT_NORMALIZE | MT_MATCH_CASE |
| * CM !norm | upper | !ZCILOOK | MT_NORMALIZE | MT_MATCH_CASE |
| * CM !norm | upper | ZCILOOK | MT_NORMALIZE |
| * CM norm | upper|formX | !ZCILOOK | MT_NORMALIZE | MT_MATCH_CASE |
| * CM norm | upper|formX | ZCILOOK | MT_NORMALIZE |
| * |
| * Abbreviations: |
| * CS = Case Sensitive, CI = Case Insensitive, CM = Case Mixed |
| * upper = case folding set by fs type on creation (U8_TEXTPREP_TOUPPER) |
| * formX = unicode normalization form set on fs creation |
| */ |
| static int |
| zfs_dropname(zfs_dirlock_t *dl, znode_t *zp, znode_t *dzp, dmu_tx_t *tx, |
| int flag) |
| { |
| int error; |
| |
| if (ZTOZSB(zp)->z_norm) { |
| matchtype_t mt = MT_NORMALIZE; |
| |
| if ((ZTOZSB(zp)->z_case == ZFS_CASE_INSENSITIVE && |
| (flag & ZCIEXACT)) || |
| (ZTOZSB(zp)->z_case == ZFS_CASE_MIXED && |
| !(flag & ZCILOOK))) { |
| mt |= MT_MATCH_CASE; |
| } |
| |
| error = zap_remove_norm(ZTOZSB(zp)->z_os, dzp->z_id, |
| dl->dl_name, mt, tx); |
| } else { |
| error = zap_remove(ZTOZSB(zp)->z_os, dzp->z_id, dl->dl_name, |
| tx); |
| } |
| |
| return (error); |
| } |
| |
| /* |
| * Unlink zp from dl, and mark zp for deletion if this was the last link. Can |
| * fail if zp is a mount point (EBUSY) or a non-empty directory (ENOTEMPTY). |
| * If 'unlinkedp' is NULL, we put unlinked znodes on the unlinked list. |
| * If it's non-NULL, we use it to indicate whether the znode needs deletion, |
| * and it's the caller's job to do it. |
| */ |
| int |
| zfs_link_destroy(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag, |
| boolean_t *unlinkedp) |
| { |
| znode_t *dzp = dl->dl_dzp; |
| zfsvfs_t *zfsvfs = ZTOZSB(dzp); |
| int zp_is_dir = S_ISDIR(ZTOI(zp)->i_mode); |
| boolean_t unlinked = B_FALSE; |
| sa_bulk_attr_t bulk[5]; |
| uint64_t mtime[2], ctime[2]; |
| uint64_t links; |
| int count = 0; |
| int error; |
| |
| if (!(flag & ZRENAMING)) { |
| mutex_enter(&zp->z_lock); |
| |
| if (zp_is_dir && !zfs_dirempty(zp)) { |
| mutex_exit(&zp->z_lock); |
| return (SET_ERROR(ENOTEMPTY)); |
| } |
| |
| /* |
| * If we get here, we are going to try to remove the object. |
| * First try removing the name from the directory; if that |
| * fails, return the error. |
| */ |
| error = zfs_dropname(dl, zp, dzp, tx, flag); |
| if (error != 0) { |
| mutex_exit(&zp->z_lock); |
| return (error); |
| } |
| |
| if (ZTOI(zp)->i_nlink <= zp_is_dir) { |
| zfs_panic_recover("zfs: link count on %lu is %u, " |
| "should be at least %u", zp->z_id, |
| (int)ZTOI(zp)->i_nlink, zp_is_dir + 1); |
| set_nlink(ZTOI(zp), zp_is_dir + 1); |
| } |
| drop_nlink(ZTOI(zp)); |
| if (ZTOI(zp)->i_nlink == zp_is_dir) { |
| zp->z_unlinked = B_TRUE; |
| clear_nlink(ZTOI(zp)); |
| unlinked = B_TRUE; |
| } else { |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), |
| NULL, &ctime, sizeof (ctime)); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), |
| NULL, &zp->z_pflags, sizeof (zp->z_pflags)); |
| zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime, |
| ctime); |
| } |
| links = ZTOI(zp)->i_nlink; |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), |
| NULL, &links, sizeof (links)); |
| error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx); |
| count = 0; |
| ASSERT(error == 0); |
| mutex_exit(&zp->z_lock); |
| } else { |
| error = zfs_dropname(dl, zp, dzp, tx, flag); |
| if (error != 0) |
| return (error); |
| } |
| |
| mutex_enter(&dzp->z_lock); |
| dzp->z_size--; /* one dirent removed */ |
| if (zp_is_dir) |
| drop_nlink(ZTOI(dzp)); /* ".." link from zp */ |
| links = ZTOI(dzp)->i_nlink; |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), |
| NULL, &links, sizeof (links)); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), |
| NULL, &dzp->z_size, sizeof (dzp->z_size)); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), |
| NULL, ctime, sizeof (ctime)); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), |
| NULL, mtime, sizeof (mtime)); |
| SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), |
| NULL, &dzp->z_pflags, sizeof (dzp->z_pflags)); |
| zfs_tstamp_update_setup(dzp, CONTENT_MODIFIED, mtime, ctime); |
| error = sa_bulk_update(dzp->z_sa_hdl, bulk, count, tx); |
| ASSERT(error == 0); |
| mutex_exit(&dzp->z_lock); |
| |
| if (unlinkedp != NULL) |
| *unlinkedp = unlinked; |
| else if (unlinked) |
| zfs_unlinked_add(zp, tx); |
| |
| return (0); |
| } |
| |
| /* |
| * Indicate whether the directory is empty. Works with or without z_lock |
| * held, but can only be consider a hint in the latter case. Returns true |
| * if only "." and ".." remain and there's no work in progress. |
| * |
| * The internal ZAP size, rather than zp->z_size, needs to be checked since |
| * some consumers (Lustre) do not strictly maintain an accurate SA_ZPL_SIZE. |
| */ |
| boolean_t |
| zfs_dirempty(znode_t *dzp) |
| { |
| zfsvfs_t *zfsvfs = ZTOZSB(dzp); |
| uint64_t count; |
| int error; |
| |
| if (dzp->z_dirlocks != NULL) |
| return (B_FALSE); |
| |
| error = zap_count(zfsvfs->z_os, dzp->z_id, &count); |
| if (error != 0 || count != 0) |
| return (B_FALSE); |
| |
| return (B_TRUE); |
| } |
| |
| int |
| zfs_make_xattrdir(znode_t *zp, vattr_t *vap, struct inode **xipp, cred_t *cr) |
| { |
| zfsvfs_t *zfsvfs = ZTOZSB(zp); |
| znode_t *xzp; |
| dmu_tx_t *tx; |
| int error; |
| zfs_acl_ids_t acl_ids; |
| boolean_t fuid_dirtied; |
| #ifdef DEBUG |
| uint64_t parent; |
| #endif |
| |
| *xipp = NULL; |
| |
| if ((error = zfs_zaccess(zp, ACE_WRITE_NAMED_ATTRS, 0, B_FALSE, cr))) |
| return (error); |
| |
| if ((error = zfs_acl_ids_create(zp, IS_XATTR, vap, cr, NULL, |
| &acl_ids)) != 0) |
| return (error); |
| if (zfs_acl_ids_overquota(zfsvfs, &acl_ids, zp->z_projid)) { |
| zfs_acl_ids_free(&acl_ids); |
| return (SET_ERROR(EDQUOT)); |
| } |
| |
| tx = dmu_tx_create(zfsvfs->z_os); |
| dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes + |
| ZFS_SA_BASE_ATTR_SIZE); |
| dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE); |
| dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL); |
| fuid_dirtied = zfsvfs->z_fuid_dirty; |
| if (fuid_dirtied) |
| zfs_fuid_txhold(zfsvfs, tx); |
| error = dmu_tx_assign(tx, TXG_WAIT); |
| if (error) { |
| zfs_acl_ids_free(&acl_ids); |
| dmu_tx_abort(tx); |
| return (error); |
| } |
| zfs_mknode(zp, vap, tx, cr, IS_XATTR, &xzp, &acl_ids); |
| |
| if (fuid_dirtied) |
| zfs_fuid_sync(zfsvfs, tx); |
| |
| #ifdef DEBUG |
| error = sa_lookup(xzp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs), |
| &parent, sizeof (parent)); |
| ASSERT(error == 0 && parent == zp->z_id); |
| #endif |
| |
| VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), &xzp->z_id, |
| sizeof (xzp->z_id), tx)); |
| |
| if (!zp->z_unlinked) |
| (void) zfs_log_create(zfsvfs->z_log, tx, TX_MKXATTR, zp, |
| xzp, "", NULL, acl_ids.z_fuidp, vap); |
| |
| zfs_acl_ids_free(&acl_ids); |
| dmu_tx_commit(tx); |
| |
| *xipp = ZTOI(xzp); |
| |
| return (0); |
| } |
| |
| /* |
| * Return a znode for the extended attribute directory for zp. |
| * ** If the directory does not already exist, it is created ** |
| * |
| * IN: zp - znode to obtain attribute directory from |
| * cr - credentials of caller |
| * flags - flags from the VOP_LOOKUP call |
| * |
| * OUT: xipp - pointer to extended attribute znode |
| * |
| * RETURN: 0 on success |
| * error number on failure |
| */ |
| int |
| zfs_get_xattrdir(znode_t *zp, struct inode **xipp, cred_t *cr, int flags) |
| { |
| zfsvfs_t *zfsvfs = ZTOZSB(zp); |
| znode_t *xzp; |
| zfs_dirlock_t *dl; |
| vattr_t va; |
| int error; |
| top: |
| error = zfs_dirent_lock(&dl, zp, "", &xzp, ZXATTR, NULL, NULL); |
| if (error) |
| return (error); |
| |
| if (xzp != NULL) { |
| *xipp = ZTOI(xzp); |
| zfs_dirent_unlock(dl); |
| return (0); |
| } |
| |
| if (!(flags & CREATE_XATTR_DIR)) { |
| zfs_dirent_unlock(dl); |
| return (SET_ERROR(ENOENT)); |
| } |
| |
| if (zfs_is_readonly(zfsvfs)) { |
| zfs_dirent_unlock(dl); |
| return (SET_ERROR(EROFS)); |
| } |
| |
| /* |
| * The ability to 'create' files in an attribute |
| * directory comes from the write_xattr permission on the base file. |
| * |
| * The ability to 'search' an attribute directory requires |
| * read_xattr permission on the base file. |
| * |
| * Once in a directory the ability to read/write attributes |
| * is controlled by the permissions on the attribute file. |
| */ |
| va.va_mask = ATTR_MODE | ATTR_UID | ATTR_GID; |
| va.va_mode = S_IFDIR | S_ISVTX | 0777; |
| zfs_fuid_map_ids(zp, cr, &va.va_uid, &va.va_gid); |
| |
| va.va_dentry = NULL; |
| error = zfs_make_xattrdir(zp, &va, xipp, cr); |
| zfs_dirent_unlock(dl); |
| |
| if (error == ERESTART) { |
| /* NB: we already did dmu_tx_wait() if necessary */ |
| goto top; |
| } |
| |
| return (error); |
| } |
| |
| /* |
| * Decide whether it is okay to remove within a sticky directory. |
| * |
| * In sticky directories, write access is not sufficient; |
| * you can remove entries from a directory only if: |
| * |
| * you own the directory, |
| * you own the entry, |
| * you have write access to the entry, |
| * or you are privileged (checked in secpolicy...). |
| * |
| * The function returns 0 if remove access is granted. |
| */ |
| int |
| zfs_sticky_remove_access(znode_t *zdp, znode_t *zp, cred_t *cr) |
| { |
| uid_t uid; |
| uid_t downer; |
| uid_t fowner; |
| zfsvfs_t *zfsvfs = ZTOZSB(zdp); |
| |
| if (zfsvfs->z_replay) |
| return (0); |
| |
| if ((zdp->z_mode & S_ISVTX) == 0) |
| return (0); |
| |
| downer = zfs_fuid_map_id(zfsvfs, KUID_TO_SUID(ZTOI(zdp)->i_uid), |
| cr, ZFS_OWNER); |
| fowner = zfs_fuid_map_id(zfsvfs, KUID_TO_SUID(ZTOI(zp)->i_uid), |
| cr, ZFS_OWNER); |
| |
| if ((uid = crgetuid(cr)) == downer || uid == fowner || |
| zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr) == 0) |
| return (0); |
| else |
| return (secpolicy_vnode_remove(cr)); |
| } |