fa9e4066f08beec538e775443c5be79dd423fcabahrens * CDDL HEADER START
fa9e4066f08beec538e775443c5be79dd423fcabahrens * The contents of this file are subject to the terms of the
033f983390fa5d2b54e3e09d83ac9000d71ddaaeek * Common Development and Distribution License (the "License").
033f983390fa5d2b54e3e09d83ac9000d71ddaaeek * You may not use this file except in compliance with the License.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
fa9e4066f08beec538e775443c5be79dd423fcabahrens * See the License for the specific language governing permissions
fa9e4066f08beec538e775443c5be79dd423fcabahrens * and limitations under the License.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * When distributing Covered Code, include this CDDL HEADER in each
fa9e4066f08beec538e775443c5be79dd423fcabahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If applicable, add the following below this CDDL HEADER, with the
fa9e4066f08beec538e775443c5be79dd423fcabahrens * fields enclosed by brackets "[]" replaced with your own identifying
fa9e4066f08beec538e775443c5be79dd423fcabahrens * information: Portions Copyright [yyyy] [name of copyright owner]
fa9e4066f08beec538e775443c5be79dd423fcabahrens * CDDL HEADER END
f3e6fb2f4e84077db6155f4306cc8a4cb49ff512Mark Shellenbaum * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
9a686fbc186e8e2a64e9a5094d44c7d6fa0ea167Paul Dagnelie * Copyright (c) 2013, 2015 by Delphix. All rights reserved.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * zfs_match_find() is used by zfs_dirent_lock() to peform zap lookups
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * of names after deciding which is the appropriate lookup interface.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amwzfs_match_find(zfsvfs_t *zfsvfs, znode_t *dzp, char *name, boolean_t exact,
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw boolean_t update, int *deflags, pathname_t *rpnp, uint64_t *zoid)
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * In the non-mixed case we only expect there would ever
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * be one match, but we need to use the normalizing lookup.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw error = zap_lookup_norm(zfsvfs->z_os, dzp->z_id, name, 8, 1,
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw error = zap_lookup(zfsvfs->z_os, dzp->z_id, name, 8, 1, zoid);
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Lock a directory entry. A dirlock on <dzp, name> protects that name
fa9e4066f08beec538e775443c5be79dd423fcabahrens * in dzp's directory zap object. As long as you hold a dirlock, you can
fa9e4066f08beec538e775443c5be79dd423fcabahrens * assume two things: (1) dzp cannot be reaped, and (2) no other thread
fa9e4066f08beec538e775443c5be79dd423fcabahrens * can change the zap entry for (i.e. link or unlink) this name.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Input arguments:
fa9e4066f08beec538e775443c5be79dd423fcabahrens * dzp - znode for directory
fa9e4066f08beec538e775443c5be79dd423fcabahrens * name - name of entry to lock
fa9e4066f08beec538e775443c5be79dd423fcabahrens * flag - ZNEW: if the entry already exists, fail with EEXIST.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * ZEXISTS: if the entry does not exist, fail with ENOENT.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * ZSHARED: allow concurrent access with other ZSHARED callers.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * ZXATTR: we want dzp's xattr directory
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * ZCILOOK: On a mixed sensitivity file system,
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * this lookup should be case-insensitive.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * ZCIEXACT: On a purely case-insensitive file system,
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * this lookup should be case-sensitive.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * ZRENAMING: we are locking for renaming, force narrow locks
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi * ZHAVELOCK: Don't grab the z_name_lock for this call. The
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi * current thread already holds it.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Output arguments:
fa9e4066f08beec538e775443c5be79dd423fcabahrens * zpp - pointer to the znode for the entry (NULL if there isn't one)
fa9e4066f08beec538e775443c5be79dd423fcabahrens * dlpp - pointer to the dirlock for this entry (NULL on error)
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * direntflags - (case-insensitive lookup only)
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * flags if multiple case-sensitive matches exist in directory
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * realpnp - (case-insensitive lookup only)
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * actual name matched within the directory
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Return value: 0 on success or errno on failure.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * NOTE: Always checks for, and rejects, '.' and '..'.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * NOTE: For case-insensitive file systems we take wide locks (see below),
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * but return znode pointers to a single match.
fa9e4066f08beec538e775443c5be79dd423fcabahrenszfs_dirent_lock(zfs_dirlock_t **dlpp, znode_t *dzp, char *name, znode_t **zpp,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Verify that we are not trying to lock '.', '..', or '.zfs'
fa9e4066f08beec538e775443c5be79dd423fcabahrens (name[1] == '\0' || (name[1] == '.' && name[2] == '\0')) ||
fa9e4066f08beec538e775443c5be79dd423fcabahrens zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0)
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Case sensitivity and normalization preferences are set when
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * the file system is created. These are stored in the
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * zfsvfs->z_case and zfsvfs->z_norm fields. These choices
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * affect what vnodes can be cached in the DNLC, how we
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * perform zap lookups, and the "width" of our dirlocks.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * A normal dirlock locks a single name. Note that with
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * normalization a name can be composed multiple ways, but
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * when normalized, these names all compare equal. A wide
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * dirlock locks multiple names. We need these when the file
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * system is supporting mixed-mode access. It is sometimes
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * necessary to lock all case permutations of file name at
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * once so that simultaneous case-insensitive/case-sensitive
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * behaves as rationally as possible.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Decide if exact matches should be requested when performing
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * a zap lookup on file systems supporting case-insensitive
de8267e0f723ed2c38ea9def92d465f69a300f56timh ((zfsvfs->z_case == ZFS_CASE_INSENSITIVE) && (flag & ZCIEXACT)) ||
de8267e0f723ed2c38ea9def92d465f69a300f56timh ((zfsvfs->z_case == ZFS_CASE_MIXED) && !(flag & ZCILOOK));
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Only look in or update the DNLC if we are looking for the
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * name on a file system that does not require normalization
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * or case folding. We can also look there if we happen to be
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * on a non-normalizing, mixed sensitivity file system IF we
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * are looking for the exact name.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Maybe can add TO-UPPERed version of name to dnlc in ci-only
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * case for performance improvement?
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw !(zfsvfs->z_norm & ~U8_TEXTPREP_TOUPPER) && !(flag & ZCILOOK));
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * ZRENAMING indicates we are in a situation where we should
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * take narrow locks regardless of the file system's
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * preferences for normalizing and case folding. This will
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * prevent us deadlocking trying to grab the same wide lock
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * twice if the two names happen to be case-insensitive
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * matches.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Wait until there are no locks on this name.
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi * Don't grab the the lock if it is already held. However, cannot
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi * have both ZSHARED and ZHAVELOCK together.
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi ASSERT(!(flag & ZSHARED) || !(flag & ZHAVELOCK));
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw for (dl = dzp->z_dirlocks; dl != NULL; dl = dl->dl_next) {
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw if (error != 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Allocate a new dirlock and add it to the list.
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi * If the z_name_lock was NOT held for this dirlock record it.
fa9e4066f08beec538e775443c5be79dd423fcabahrens if ((flag & ZSHARED) && ++dl->dl_sharecnt > 1 && dl->dl_namesize == 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens * We're the second shared reference to dl. Make a copy of
fa9e4066f08beec538e775443c5be79dd423fcabahrens * dl_name in case the first thread goes away before we do.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Note that we initialize the new name before storing its
fa9e4066f08beec538e775443c5be79dd423fcabahrens * pointer into dl_name, because the first thread may load
fa9e4066f08beec538e775443c5be79dd423fcabahrens * dl->dl_name at any time. He'll either see the old value,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * which is his, or the new shared copy; either is OK.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * We have a dirlock on the name. (Note that it is the dirlock,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * not the dzp's z_lock, that protects the name in the zap object.)
fa9e4066f08beec538e775443c5be79dd423fcabahrens * See if there's an object by this name; if so, put a hold on it.
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum error = sa_lookup(dzp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), &zoid,
033f983390fa5d2b54e3e09d83ac9000d71ddaaeek } else if (vp) {
033f983390fa5d2b54e3e09d83ac9000d71ddaaeek return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Unlock this directory entry and wake anyone who was waiting for it.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Look up an entry in a directory.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * NOTE: '.' and '..' are handled as special cases because
fa9e4066f08beec538e775443c5be79dd423fcabahrens * no directory entries are actually stored for them. If this is
fa9e4066f08beec538e775443c5be79dd423fcabahrens * the root of a filesystem, then '.zfs' is also treated as a
fa9e4066f08beec538e775443c5be79dd423fcabahrens * special pseudo-directory.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amwzfs_dirlook(znode_t *dzp, char *name, vnode_t **vpp, int flags,
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (name[0] == 0 || (name[0] == '.' && name[1] == 0)) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else if (name[0] == '.' && name[1] == '.' && name[2] == 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If we are a snapshot mounted under .zfs, return
fa9e4066f08beec538e775443c5be79dd423fcabahrens * the vp for the snapshot directory.
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ZPL_PARENT(zfsvfs), &parent, sizeof (parent))) != 0)
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum if (parent == dzp->z_id && zfsvfs->z_parent != zfsvfs) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens error = zfsctl_root_lookup(zfsvfs->z_parent->z_ctldir,
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else if (zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0) {
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw error = zfs_dirent_lock(&dl, dzp, name, &zp, zf, deflg, rpnp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (error == 0) {
7f6e3e7d4ebf3d6d45073854bef004ca26f8e918perrin dzp->z_zn_prefetch = B_TRUE; /* enable prefetching */
893a6d32980d24be1349478f44169009d4801c25ahrens * unlinked Set (formerly known as the "delete queue") Error Handling
893a6d32980d24be1349478f44169009d4801c25ahrens * When dealing with the unlinked set, we dmu_tx_hold_zap(), but we
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * don't specify the name of the entry that we will be manipulating. We
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * also fib and say that we won't be adding any new entries to the
893a6d32980d24be1349478f44169009d4801c25ahrens * unlinked set, even though we might (this is to lower the minimum file
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * size that can be deleted in a full filesystem). So on the small
893a6d32980d24be1349478f44169009d4801c25ahrens * chance that the nlink list is using a fat zap (ie. has more than
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * 2000 entries), we *may* not pre-read a block that's needed.
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * Therefore it is remotely possible for some of the assertions
893a6d32980d24be1349478f44169009d4801c25ahrens * regarding the unlinked set below to fail due to i/o error. On a
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * nondebug system, this will result in the space being leaked.
b420f3adeb349714478d1a7813d2c0e069d41555Richard Lowe zap_add_int(zfsvfs->z_os, zfsvfs->z_unlinkedobj, zp->z_id, tx));
893a6d32980d24be1349478f44169009d4801c25ahrens * Clean up any znodes that had no links when we either crashed or
893a6d32980d24be1349478f44169009d4801c25ahrens * (force) umounted the file system.
893a6d32980d24be1349478f44169009d4801c25ahrens * Interate over the contents of the unlinked set.
893a6d32980d24be1349478f44169009d4801c25ahrens for (zap_cursor_init(&zc, zfsvfs->z_os, zfsvfs->z_unlinkedobj);
893a6d32980d24be1349478f44169009d4801c25ahrens * See what kind of object we have in list
893a6d32980d24be1349478f44169009d4801c25ahrens ASSERT((doi.doi_type == DMU_OT_PLAIN_FILE_CONTENTS) ||
893a6d32980d24be1349478f44169009d4801c25ahrens * We need to re-mark these list entries for deletion,
893a6d32980d24be1349478f44169009d4801c25ahrens * so we pull them back into core and set zp->z_unlinked.
893a6d32980d24be1349478f44169009d4801c25ahrens * We may pick up znodes that are already marked for deletion.
893a6d32980d24be1349478f44169009d4801c25ahrens * This could happen during the purge of an extended attribute
893a6d32980d24be1349478f44169009d4801c25ahrens * directory. All we need to do is skip over them, since they
893a6d32980d24be1349478f44169009d4801c25ahrens * are already in the system marked z_unlinked.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Delete the entire contents of a directory. Return a count
40ff3960ec49d8bb707c8b7f0030f2ac0c014033ck * of the number of entries that could not be deleted. If we encounter
40ff3960ec49d8bb707c8b7f0030f2ac0c014033ck * an error, return a count of at least one so that the directory stays
40ff3960ec49d8bb707c8b7f0030f2ac0c014033ck * in the unlinked set.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * NOTE: this function assumes that the directory is inactive,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * so there is no need to lock its entries before deletion.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Also, it assumes the directory contents is *only* regular
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock dmu_tx_hold_zap(tx, dzp->z_id, FALSE, zap.za_name);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE);
893a6d32980d24be1349478f44169009d4801c25ahrens dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum /* Is this really needed ? */
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If this is an attribute directory, purge its contents.
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum if (ZTOV(zp)->v_type == VDIR && (zp->z_pflags & ZFS_XATTR)) {
893a6d32980d24be1349478f44169009d4801c25ahrens * Not enough space to delete some xattrs.
cdb0ab79ea1af7b8fc339a04d4bf7426dc77ec4emaybee * Leave it in the unlinked set.
399cc7d5d9aff97c714b708af3e3f0280ceab93fChunwei Chen * Free up all the data in the file. We don't do this for
399cc7d5d9aff97c714b708af3e3f0280ceab93fChunwei Chen * XATTR directories because we need truncate and remove to be
399cc7d5d9aff97c714b708af3e3f0280ceab93fChunwei Chen * in the same tx, like in zfs_znode_delete(). Otherwise, if
399cc7d5d9aff97c714b708af3e3f0280ceab93fChunwei Chen * we crash here we'll end up with an inconsistent truncated
399cc7d5d9aff97c714b708af3e3f0280ceab93fChunwei Chen * zap object in the delete queue. Note a truncated file is
399cc7d5d9aff97c714b708af3e3f0280ceab93fChunwei Chen * harmless since it only contains user data.
399cc7d5d9aff97c714b708af3e3f0280ceab93fChunwei Chen error = dmu_free_long_range(os, zp->z_id, 0, DMU_OBJECT_END);
eb721827677c553ce8dd0d4390630a857f923f98Alek Pinchuk * Not enough space or we were interrupted by unmount.
eb721827677c553ce8dd0d4390630a857f923f98Alek Pinchuk * Leave the file in the unlinked set.
893a6d32980d24be1349478f44169009d4801c25ahrens * If the file has extended attributes, we're going to unlink
893a6d32980d24be1349478f44169009d4801c25ahrens * the xattr dir.
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum error = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
cdb0ab79ea1af7b8fc339a04d4bf7426dc77ec4emaybee * Set up the final transaction.
893a6d32980d24be1349478f44169009d4801c25ahrens dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
893a6d32980d24be1349478f44169009d4801c25ahrens dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, TRUE, NULL);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE);
893a6d32980d24be1349478f44169009d4801c25ahrens * Not enough space to delete the file. Leave it in the
893a6d32980d24be1349478f44169009d4801c25ahrens * unlinked set, leaking it until the fs is remounted (at
893a6d32980d24be1349478f44169009d4801c25ahrens * which point we'll call zfs_unlinked_drain() to process it).
893a6d32980d24be1349478f44169009d4801c25ahrens xzp->z_unlinked = B_TRUE; /* mark xzp for deletion */
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum xzp->z_links = 0; /* no more links to it */
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum VERIFY(0 == sa_update(xzp->z_sa_hdl, SA_ZPL_LINKS(zfsvfs),
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum &xzp->z_links, sizeof (xzp->z_links), tx));
893a6d32980d24be1349478f44169009d4801c25ahrens /* Remove this znode from the unlinked set */
b420f3adeb349714478d1a7813d2c0e069d41555Richard Lowe zap_remove_int(zfsvfs->z_os, zfsvfs->z_unlinkedobj, zp->z_id, tx));
e7437265dc2a4920c197ed4337665539d358b22cahrens if (zp->z_zfsvfs->z_version >= ZPL_VERSION_DIRENT_TYPE)
893a6d32980d24be1349478f44169009d4801c25ahrens * Link zp into dl. Can only fail if zp has been unlinked.
fa9e4066f08beec538e775443c5be79dd423fcabahrenszfs_link_create(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag)
893a6d32980d24be1349478f44169009d4801c25ahrens if (zp->z_unlinked) { /* no new links to unlinked zp */
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum zfs_tstamp_update_setup(dzp, CONTENT_MODIFIED, mtime, ctime, B_TRUE);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum error = sa_bulk_update(dzp->z_sa_hdl, bulk, count, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens error = zap_add(zp->z_zfsvfs->z_os, dzp->z_id, dl->dl_name,
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falknerzfs_dropname(zfs_dirlock_t *dl, znode_t *zp, znode_t *dzp, dmu_tx_t *tx,
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner if (((zp->z_zfsvfs->z_case == ZFS_CASE_INSENSITIVE) &&
893a6d32980d24be1349478f44169009d4801c25ahrens * Unlink zp from dl, and mark zp for deletion if this was the last link.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Can fail if zp is a mount point (EBUSY) or a non-empty directory (EEXIST).
893a6d32980d24be1349478f44169009d4801c25ahrens * If 'unlinkedp' is NULL, we put unlinked znodes on the unlinked list.
893a6d32980d24be1349478f44169009d4801c25ahrens * If it's non-NULL, we use it to indicate whether the znode needs deletion,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * and it's the caller's job to do it.
fa9e4066f08beec538e775443c5be79dd423fcabahrenszfs_link_destroy(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag,
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner * If we get here, we are going to try to remove the object.
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner * First try removing the name from the directory; if that
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner * fails, return the error.
0125049cd6136d1d2ca9e982382a915b6d7916ceahrens "should be at least %u",
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs),
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum NULL, &zp->z_pflags, sizeof (zp->z_pflags));
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime, ctime,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs),
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum dzp->z_links -= zp_is_dir; /* ".." link from zp */
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs),
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum NULL, &dzp->z_links, sizeof (dzp->z_links));
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs),
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs),
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs),
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum NULL, &dzp->z_pflags, sizeof (dzp->z_pflags));
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum zfs_tstamp_update_setup(dzp, CONTENT_MODIFIED, mtime, ctime, B_TRUE);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum error = sa_bulk_update(dzp->z_sa_hdl, bulk, count, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Indicate whether the directory is empty. Works with or without z_lock
fa9e4066f08beec538e775443c5be79dd423fcabahrens * held, but can only be consider a hint in the latter case. Returns true
fa9e4066f08beec538e775443c5be79dd423fcabahrens * if only "." and ".." remain and there's no work in progress.
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum return (dzp->z_size == 2 && dzp->z_dirlocks == 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrenszfs_make_xattrdir(znode_t *zp, vattr_t *vap, vnode_t **xvpp, cred_t *cr)
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw if (error = zfs_zaccess(zp, ACE_WRITE_NAMED_ATTRS, 0, B_FALSE, cr))
89459e17032b6bb1d59eebd2b7c0d06859d4657cMark Shellenbaum if ((error = zfs_acl_ids_create(zp, IS_XATTR, vap, cr, NULL,
148434217c040ea38dc844384f6ba68d9b325906Matthew Ahrens if (zfs_acl_ids_overquota(zfsvfs, &acl_ids)) {
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum zfs_mknode(zp, vap, tx, cr, IS_XATTR, &xzp, &acl_ids);
f3e6fb2f4e84077db6155f4306cc8a4cb49ff512Mark Shellenbaum error = sa_lookup(xzp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs),
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), &xzp->z_id,
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw (void) zfs_log_create(zfsvfs->z_log, tx, TX_MKXATTR, zp,
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Return a znode for the extended attribute directory for zp.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * ** If the directory does not already exist, it is created **
fa9e4066f08beec538e775443c5be79dd423fcabahrens * IN: zp - znode to obtain attribute directory from
fa9e4066f08beec538e775443c5be79dd423fcabahrens * cr - credentials of caller
3f063a9d046be1602e680274441fdc168bba9f61ck * flags - flags from the VOP_LOOKUP call
fa9e4066f08beec538e775443c5be79dd423fcabahrens * OUT: xzpp - pointer to extended attribute znode
fa9e4066f08beec538e775443c5be79dd423fcabahrens * RETURN: 0 on success
fa9e4066f08beec538e775443c5be79dd423fcabahrens * error number on failure
3f063a9d046be1602e680274441fdc168bba9f61ckzfs_get_xattrdir(znode_t *zp, vnode_t **xvpp, cred_t *cr, int flags)
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw error = zfs_dirent_lock(&dl, zp, "", &xzp, ZXATTR, NULL, NULL);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens * The ability to 'create' files in an attribute
fa9e4066f08beec538e775443c5be79dd423fcabahrens * directory comes from the write_xattr permission on the base file.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * The ability to 'search' an attribute directory requires
fa9e4066f08beec538e775443c5be79dd423fcabahrens * read_xattr permission on the base file.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Once in a directory the ability to read/write attributes
fa9e4066f08beec538e775443c5be79dd423fcabahrens * is controlled by the permissions on the attribute file.
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens /* NB: we already did dmu_tx_wait() if necessary */
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Decide whether it is okay to remove within a sticky directory.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * In sticky directories, write access is not sufficient;
fa9e4066f08beec538e775443c5be79dd423fcabahrens * you can remove entries from a directory only if:
fa9e4066f08beec538e775443c5be79dd423fcabahrens * you own the directory,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * you own the entry,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * the entry is a plain file and you have write access,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * or you are privileged (checked in secpolicy...).
fa9e4066f08beec538e775443c5be79dd423fcabahrens * The function returns 0 if remove access is granted.
fa9e4066f08beec538e775443c5be79dd423fcabahrenszfs_sticky_remove_access(znode_t *zdp, znode_t *zp, cred_t *cr)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw return (0);
f1696b231bb1209e1cea95b7ff29b8c60493daa0Mark Shellenbaum downer = zfs_fuid_map_id(zfsvfs, zdp->z_uid, cr, ZFS_OWNER);
f1696b231bb1209e1cea95b7ff29b8c60493daa0Mark Shellenbaum fowner = zfs_fuid_map_id(zfsvfs, zp->z_uid, cr, ZFS_OWNER);
f1696b231bb1209e1cea95b7ff29b8c60493daa0Mark Shellenbaum if ((uid = crgetuid(cr)) == downer || uid == fowner ||
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);