fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * CDDL HEADER START
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
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 *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
fa9e4066f08beec538e775443c5be79dd423fcabahrens * or http://www.opensolaris.org/os/licensing.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * See the License for the specific language governing permissions
fa9e4066f08beec538e775443c5be79dd423fcabahrens * and limitations under the License.
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
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 *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * CDDL HEADER END
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
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.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/types.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/param.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/time.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/systm.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/sysmacros.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/resource.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/vfs.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/vnode.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/file.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/mode.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/kmem.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/uio.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/pathname.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/cmn_err.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/errno.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/stat.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/unistd.h>
de8267e0f723ed2c38ea9def92d465f69a300f56timh#include <sys/sunddi.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/random.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/policy.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/zfs_dir.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/zfs_acl.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/fs/zfs.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include "fs/fs_subr.h"
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/zap.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/dmu.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/atomic.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/zfs_ctldir.h>
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw#include <sys/zfs_fuid.h>
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum#include <sys/sa.h>
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum#include <sys/zfs_sa.h>
033f983390fa5d2b54e3e09d83ac9000d71ddaaeek#include <sys/dnlc.h>
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw#include <sys/extdirent.h>
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw/*
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.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw */
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amwstatic int
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{
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw int error;
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw if (zfsvfs->z_norm) {
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw matchtype_t mt = MT_FIRST;
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw boolean_t conflict = B_FALSE;
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw size_t bufsz = 0;
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw char *buf = NULL;
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw if (rpnp) {
ab04eb8ef60d9dc9614d6cccffc474f24ca1d162timh buf = rpnp->pn_buf;
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw bufsz = rpnp->pn_bufsize;
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw }
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw if (exact)
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw mt = MT_EXACT;
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw /*
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 */
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw error = zap_lookup_norm(zfsvfs->z_os, dzp->z_id, name, 8, 1,
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw zoid, mt, buf, bufsz, &conflict);
ab04eb8ef60d9dc9614d6cccffc474f24ca1d162timh if (!error && deflags)
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw *deflags = conflict ? ED_CASE_CONFLICT : 0;
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw } else {
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw error = zap_lookup(zfsvfs->z_os, dzp->z_id, name, 8, 1, zoid);
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw }
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw *zoid = ZFS_DIRENT_OBJ(*zoid);
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw if (error == ENOENT && update)
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw dnlc_update(ZTOV(dzp), name, DNLC_NO_VNODE);
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw return (error);
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
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 *
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 *
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 *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Return value: 0 on success or errno on failure.
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
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.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrenszfs_dirent_lock(zfs_dirlock_t **dlpp, znode_t *dzp, char *name, znode_t **zpp,
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw int flag, int *direntflags, pathname_t *realpnp)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zfs_dirlock_t *dl;
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw boolean_t update;
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw boolean_t exact;
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint64_t zoid;
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw vnode_t *vp = NULL;
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw int error = 0;
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw int cmpflags;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens *zpp = NULL;
fa9e4066f08beec538e775443c5be79dd423fcabahrens *dlpp = NULL;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Verify that we are not trying to lock '.', '..', or '.zfs'
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (name[0] == '.' &&
fa9e4066f08beec538e775443c5be79dd423fcabahrens (name[1] == '\0' || (name[1] == '.' && name[2] == '\0')) ||
fa9e4066f08beec538e775443c5be79dd423fcabahrens zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0)
be6fd75a69ae679453d9cda5bff3326111e6d1caMatthew Ahrens return (SET_ERROR(EEXIST));
fa9e4066f08beec538e775443c5be79dd423fcabahrens
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw /*
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 *
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 */
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw /*
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Decide if exact matches should be requested when performing
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * a zap lookup on file systems supporting case-insensitive
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * access.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw */
de8267e0f723ed2c38ea9def92d465f69a300f56timh exact =
de8267e0f723ed2c38ea9def92d465f69a300f56timh ((zfsvfs->z_case == ZFS_CASE_INSENSITIVE) && (flag & ZCIEXACT)) ||
de8267e0f723ed2c38ea9def92d465f69a300f56timh ((zfsvfs->z_case == ZFS_CASE_MIXED) && !(flag & ZCILOOK));
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw /*
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 *
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Maybe can add TO-UPPERed version of name to dnlc in ci-only
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * case for performance improvement?
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw */
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw update = !zfsvfs->z_norm ||
de8267e0f723ed2c38ea9def92d465f69a300f56timh ((zfsvfs->z_case == ZFS_CASE_MIXED) &&
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw !(zfsvfs->z_norm & ~U8_TEXTPREP_TOUPPER) && !(flag & ZCILOOK));
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw /*
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.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw */
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw if (flag & ZRENAMING)
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw cmpflags = 0;
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw else
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw cmpflags = zfsvfs->z_norm;
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Wait until there are no locks on this name.
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi *
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi * Don't grab the the lock if it is already held. However, cannot
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi * have both ZSHARED and ZHAVELOCK together.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi ASSERT(!(flag & ZSHARED) || !(flag & ZHAVELOCK));
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi if (!(flag & ZHAVELOCK))
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi rw_enter(&dzp->z_name_lock, RW_READER);
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_enter(&dzp->z_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens for (;;) {
893a6d32980d24be1349478f44169009d4801c25ahrens if (dzp->z_unlinked) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_exit(&dzp->z_lock);
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi if (!(flag & ZHAVELOCK))
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi rw_exit(&dzp->z_name_lock);
be6fd75a69ae679453d9cda5bff3326111e6d1caMatthew Ahrens return (SET_ERROR(ENOENT));
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw for (dl = dzp->z_dirlocks; dl != NULL; dl = dl->dl_next) {
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw if ((u8_strcmp(name, dl->dl_name, 0, cmpflags,
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw U8_UNICODE_LATEST, &error) == 0) || error != 0)
fa9e4066f08beec538e775443c5be79dd423fcabahrens break;
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw }
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw if (error != 0) {
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw mutex_exit(&dzp->z_lock);
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi if (!(flag & ZHAVELOCK))
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi rw_exit(&dzp->z_name_lock);
be6fd75a69ae679453d9cda5bff3326111e6d1caMatthew Ahrens return (SET_ERROR(ENOENT));
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw }
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (dl == NULL) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Allocate a new dirlock and add it to the list.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens dl = kmem_alloc(sizeof (zfs_dirlock_t), KM_SLEEP);
fa9e4066f08beec538e775443c5be79dd423fcabahrens cv_init(&dl->dl_cv, NULL, CV_DEFAULT, NULL);
fa9e4066f08beec538e775443c5be79dd423fcabahrens dl->dl_name = name;
fa9e4066f08beec538e775443c5be79dd423fcabahrens dl->dl_sharecnt = 0;
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi dl->dl_namelock = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens dl->dl_namesize = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens dl->dl_dzp = dzp;
fa9e4066f08beec538e775443c5be79dd423fcabahrens dl->dl_next = dzp->z_dirlocks;
fa9e4066f08beec538e775443c5be79dd423fcabahrens dzp->z_dirlocks = dl;
fa9e4066f08beec538e775443c5be79dd423fcabahrens break;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens if ((flag & ZSHARED) && dl->dl_sharecnt != 0)
fa9e4066f08beec538e775443c5be79dd423fcabahrens break;
fa9e4066f08beec538e775443c5be79dd423fcabahrens cv_wait(&dl->dl_cv, &dzp->z_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi /*
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi * If the z_name_lock was NOT held for this dirlock record it.
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi */
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi if (flag & ZHAVELOCK)
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi dl->dl_namelock = 1;
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi
fa9e4066f08beec538e775443c5be79dd423fcabahrens if ((flag & ZSHARED) && ++dl->dl_sharecnt > 1 && dl->dl_namesize == 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
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 */
fa9e4066f08beec538e775443c5be79dd423fcabahrens dl->dl_namesize = strlen(dl->dl_name) + 1;
fa9e4066f08beec538e775443c5be79dd423fcabahrens name = kmem_alloc(dl->dl_namesize, KM_SLEEP);
fa9e4066f08beec538e775443c5be79dd423fcabahrens bcopy(dl->dl_name, name, dl->dl_namesize);
fa9e4066f08beec538e775443c5be79dd423fcabahrens dl->dl_name = name;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_exit(&dzp->z_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
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.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (flag & ZXATTR) {
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum error = sa_lookup(dzp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), &zoid,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum sizeof (zoid));
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum if (error == 0)
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum error = (zoid == 0 ? ENOENT : 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else {
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw if (update)
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw vp = dnlc_lookup(ZTOV(dzp), name);
033f983390fa5d2b54e3e09d83ac9000d71ddaaeek if (vp == DNLC_NO_VNODE) {
033f983390fa5d2b54e3e09d83ac9000d71ddaaeek VN_RELE(vp);
be6fd75a69ae679453d9cda5bff3326111e6d1caMatthew Ahrens error = SET_ERROR(ENOENT);
033f983390fa5d2b54e3e09d83ac9000d71ddaaeek } else if (vp) {
033f983390fa5d2b54e3e09d83ac9000d71ddaaeek if (flag & ZNEW) {
033f983390fa5d2b54e3e09d83ac9000d71ddaaeek zfs_dirent_unlock(dl);
033f983390fa5d2b54e3e09d83ac9000d71ddaaeek VN_RELE(vp);
be6fd75a69ae679453d9cda5bff3326111e6d1caMatthew Ahrens return (SET_ERROR(EEXIST));
033f983390fa5d2b54e3e09d83ac9000d71ddaaeek }
033f983390fa5d2b54e3e09d83ac9000d71ddaaeek *dlpp = dl;
033f983390fa5d2b54e3e09d83ac9000d71ddaaeek *zpp = VTOZ(vp);
033f983390fa5d2b54e3e09d83ac9000d71ddaaeek return (0);
033f983390fa5d2b54e3e09d83ac9000d71ddaaeek } else {
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw error = zfs_match_find(zfsvfs, dzp, name, exact,
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw update, direntflags, realpnp, &zoid);
033f983390fa5d2b54e3e09d83ac9000d71ddaaeek }
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (error) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (error != ENOENT || (flag & ZEXISTS)) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens zfs_dirent_unlock(dl);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (error);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else {
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (flag & ZNEW) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens zfs_dirent_unlock(dl);
be6fd75a69ae679453d9cda5bff3326111e6d1caMatthew Ahrens return (SET_ERROR(EEXIST));
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens error = zfs_zget(zfsvfs, zoid, zpp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (error) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens zfs_dirent_unlock(dl);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (error);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw if (!(flag & ZXATTR) && update)
033f983390fa5d2b54e3e09d83ac9000d71ddaaeek dnlc_update(ZTOV(dzp), name, ZTOV(*zpp));
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens *dlpp = dl;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Unlock this directory entry and wake anyone who was waiting for it.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrensvoid
fa9e4066f08beec538e775443c5be79dd423fcabahrenszfs_dirent_unlock(zfs_dirlock_t *dl)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens znode_t *dzp = dl->dl_dzp;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zfs_dirlock_t **prev_dl, *cur_dl;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_enter(&dzp->z_lock);
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi if (!dl->dl_namelock)
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi rw_exit(&dzp->z_name_lock);
afefc7e4027e02291d2f534f969cfd38b9dd1db3Sanjeev Bagewadi
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (dl->dl_sharecnt > 1) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens dl->dl_sharecnt--;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_exit(&dzp->z_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens prev_dl = &dzp->z_dirlocks;
fa9e4066f08beec538e775443c5be79dd423fcabahrens while ((cur_dl = *prev_dl) != dl)
fa9e4066f08beec538e775443c5be79dd423fcabahrens prev_dl = &cur_dl->dl_next;
fa9e4066f08beec538e775443c5be79dd423fcabahrens *prev_dl = dl->dl_next;
fa9e4066f08beec538e775443c5be79dd423fcabahrens cv_broadcast(&dl->dl_cv);
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_exit(&dzp->z_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (dl->dl_namesize != 0)
fa9e4066f08beec538e775443c5be79dd423fcabahrens kmem_free(dl->dl_name, dl->dl_namesize);
fa9e4066f08beec538e775443c5be79dd423fcabahrens cv_destroy(&dl->dl_cv);
fa9e4066f08beec538e775443c5be79dd423fcabahrens kmem_free(dl, sizeof (*dl));
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Look up an entry in a directory.
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
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.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amwzfs_dirlook(znode_t *dzp, char *name, vnode_t **vpp, int flags,
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw int *deflg, pathname_t *rpnp)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens zfs_dirlock_t *dl;
fa9e4066f08beec538e775443c5be79dd423fcabahrens znode_t *zp;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int error = 0;
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum uint64_t parent;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (name[0] == 0 || (name[0] == '.' && name[1] == 0)) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens *vpp = ZTOV(dzp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens VN_HOLD(*vpp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else if (name[0] == '.' && name[1] == '.' && name[2] == 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If we are a snapshot mounted under .zfs, return
fa9e4066f08beec538e775443c5be79dd423fcabahrens * the vp for the snapshot directory.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum if ((error = sa_lookup(dzp->z_sa_hdl,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ZPL_PARENT(zfsvfs), &parent, sizeof (parent))) != 0)
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum return (error);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum if (parent == dzp->z_id && zfsvfs->z_parent != zfsvfs) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens error = zfsctl_root_lookup(zfsvfs->z_parent->z_ctldir,
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw "snapshot", vpp, NULL, 0, NULL, kcred,
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw NULL, NULL, NULL);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (error);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens rw_enter(&dzp->z_parent_lock, RW_READER);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum error = zfs_zget(zfsvfs, parent, &zp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (error == 0)
fa9e4066f08beec538e775443c5be79dd423fcabahrens *vpp = ZTOV(zp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens rw_exit(&dzp->z_parent_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else if (zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens *vpp = zfsctl_root(dzp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else {
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw int zf;
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw zf = ZEXISTS | ZSHARED;
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw if (flags & FIGNORECASE)
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw zf |= ZCILOOK;
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw error = zfs_dirent_lock(&dl, dzp, name, &zp, zf, deflg, rpnp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (error == 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens *vpp = ZTOV(zp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens zfs_dirent_unlock(dl);
7f6e3e7d4ebf3d6d45073854bef004ca26f8e918perrin dzp->z_zn_prefetch = B_TRUE; /* enable prefetching */
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw rpnp = NULL;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ab04eb8ef60d9dc9614d6cccffc474f24ca1d162timh if ((flags & FIGNORECASE) && rpnp && !error)
ab04eb8ef60d9dc9614d6cccffc474f24ca1d162timh (void) strlcpy(rpnp->pn_buf, name, rpnp->pn_bufsize);
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (error);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock/*
893a6d32980d24be1349478f44169009d4801c25ahrens * unlinked Set (formerly known as the "delete queue") Error Handling
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock *
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.
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock */
fa9e4066f08beec538e775443c5be79dd423fcabahrensvoid
893a6d32980d24be1349478f44169009d4801c25ahrenszfs_unlinked_add(znode_t *zp, dmu_tx_t *tx)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens zfsvfs_t *zfsvfs = zp->z_zfsvfs;
cdb0ab79ea1af7b8fc339a04d4bf7426dc77ec4emaybee
cdb0ab79ea1af7b8fc339a04d4bf7426dc77ec4emaybee ASSERT(zp->z_unlinked);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum ASSERT(zp->z_links == 0);
cdb0ab79ea1af7b8fc339a04d4bf7426dc77ec4emaybee
b420f3adeb349714478d1a7813d2c0e069d41555Richard Lowe VERIFY3U(0, ==,
b420f3adeb349714478d1a7813d2c0e069d41555Richard Lowe zap_add_int(zfsvfs->z_os, zfsvfs->z_unlinkedobj, zp->z_id, tx));
cdb0ab79ea1af7b8fc339a04d4bf7426dc77ec4emaybee}
cdb0ab79ea1af7b8fc339a04d4bf7426dc77ec4emaybee
893a6d32980d24be1349478f44169009d4801c25ahrens/*
893a6d32980d24be1349478f44169009d4801c25ahrens * Clean up any znodes that had no links when we either crashed or
893a6d32980d24be1349478f44169009d4801c25ahrens * (force) umounted the file system.
893a6d32980d24be1349478f44169009d4801c25ahrens */
893a6d32980d24be1349478f44169009d4801c25ahrensvoid
893a6d32980d24be1349478f44169009d4801c25ahrenszfs_unlinked_drain(zfsvfs_t *zfsvfs)
893a6d32980d24be1349478f44169009d4801c25ahrens{
893a6d32980d24be1349478f44169009d4801c25ahrens zap_cursor_t zc;
893a6d32980d24be1349478f44169009d4801c25ahrens zap_attribute_t zap;
893a6d32980d24be1349478f44169009d4801c25ahrens dmu_object_info_t doi;
893a6d32980d24be1349478f44169009d4801c25ahrens znode_t *zp;
893a6d32980d24be1349478f44169009d4801c25ahrens int error;
893a6d32980d24be1349478f44169009d4801c25ahrens
893a6d32980d24be1349478f44169009d4801c25ahrens /*
893a6d32980d24be1349478f44169009d4801c25ahrens * Interate over the contents of the unlinked set.
893a6d32980d24be1349478f44169009d4801c25ahrens */
893a6d32980d24be1349478f44169009d4801c25ahrens for (zap_cursor_init(&zc, zfsvfs->z_os, zfsvfs->z_unlinkedobj);
893a6d32980d24be1349478f44169009d4801c25ahrens zap_cursor_retrieve(&zc, &zap) == 0;
893a6d32980d24be1349478f44169009d4801c25ahrens zap_cursor_advance(&zc)) {
893a6d32980d24be1349478f44169009d4801c25ahrens
893a6d32980d24be1349478f44169009d4801c25ahrens /*
893a6d32980d24be1349478f44169009d4801c25ahrens * See what kind of object we have in list
893a6d32980d24be1349478f44169009d4801c25ahrens */
893a6d32980d24be1349478f44169009d4801c25ahrens
893a6d32980d24be1349478f44169009d4801c25ahrens error = dmu_object_info(zfsvfs->z_os,
893a6d32980d24be1349478f44169009d4801c25ahrens zap.za_first_integer, &doi);
893a6d32980d24be1349478f44169009d4801c25ahrens if (error != 0)
893a6d32980d24be1349478f44169009d4801c25ahrens continue;
893a6d32980d24be1349478f44169009d4801c25ahrens
893a6d32980d24be1349478f44169009d4801c25ahrens ASSERT((doi.doi_type == DMU_OT_PLAIN_FILE_CONTENTS) ||
893a6d32980d24be1349478f44169009d4801c25ahrens (doi.doi_type == DMU_OT_DIRECTORY_CONTENTS));
893a6d32980d24be1349478f44169009d4801c25ahrens /*
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 */
893a6d32980d24be1349478f44169009d4801c25ahrens error = zfs_zget(zfsvfs, zap.za_first_integer, &zp);
893a6d32980d24be1349478f44169009d4801c25ahrens
893a6d32980d24be1349478f44169009d4801c25ahrens /*
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.
893a6d32980d24be1349478f44169009d4801c25ahrens */
893a6d32980d24be1349478f44169009d4801c25ahrens if (error != 0)
893a6d32980d24be1349478f44169009d4801c25ahrens continue;
893a6d32980d24be1349478f44169009d4801c25ahrens
893a6d32980d24be1349478f44169009d4801c25ahrens zp->z_unlinked = B_TRUE;
893a6d32980d24be1349478f44169009d4801c25ahrens VN_RELE(ZTOV(zp));
893a6d32980d24be1349478f44169009d4801c25ahrens }
893a6d32980d24be1349478f44169009d4801c25ahrens zap_cursor_fini(&zc);
893a6d32980d24be1349478f44169009d4801c25ahrens}
893a6d32980d24be1349478f44169009d4801c25ahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
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 *
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
fa9e4066f08beec538e775443c5be79dd423fcabahrens * files.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrensstatic int
fa9e4066f08beec538e775443c5be79dd423fcabahrenszfs_purgedir(znode_t *dzp)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap_cursor_t zc;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap_attribute_t zap;
fa9e4066f08beec538e775443c5be79dd423fcabahrens znode_t *xzp;
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_tx_t *tx;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zfs_dirlock_t dl;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int skipped = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int error;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens for (zap_cursor_init(&zc, zfsvfs->z_os, dzp->z_id);
fa9e4066f08beec538e775443c5be79dd423fcabahrens (error = zap_cursor_retrieve(&zc, &zap)) == 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zap_cursor_advance(&zc)) {
b1b8ab34de515a5e83206da22c3d7e563241b021lling error = zfs_zget(zfsvfs,
b1b8ab34de515a5e83206da22c3d7e563241b021lling ZFS_DIRENT_OBJ(zap.za_first_integer), &xzp);
40ff3960ec49d8bb707c8b7f0030f2ac0c014033ck if (error) {
40ff3960ec49d8bb707c8b7f0030f2ac0c014033ck skipped += 1;
40ff3960ec49d8bb707c8b7f0030f2ac0c014033ck continue;
40ff3960ec49d8bb707c8b7f0030f2ac0c014033ck }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT((ZTOV(xzp)->v_type == VREG) ||
fa9e4066f08beec538e775443c5be79dd423fcabahrens (ZTOV(xzp)->v_type == VLNK));
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens tx = dmu_tx_create(zfsvfs->z_os);
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 ? */
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum zfs_sa_upgrade_txholds(tx, xzp);
4bb73804952172060c9efb163b89c17f56804fe8Matthew Ahrens dmu_tx_mark_netfree(tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens error = dmu_tx_assign(tx, TXG_WAIT);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (error) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_tx_abort(tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens VN_RELE(ZTOV(xzp));
fa9e4066f08beec538e775443c5be79dd423fcabahrens skipped += 1;
fa9e4066f08beec538e775443c5be79dd423fcabahrens continue;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens bzero(&dl, sizeof (dl));
fa9e4066f08beec538e775443c5be79dd423fcabahrens dl.dl_dzp = dzp;
fa9e4066f08beec538e775443c5be79dd423fcabahrens dl.dl_name = zap.za_name;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens error = zfs_link_destroy(&dl, xzp, tx, 0, NULL);
40ff3960ec49d8bb707c8b7f0030f2ac0c014033ck if (error)
40ff3960ec49d8bb707c8b7f0030f2ac0c014033ck skipped += 1;
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_tx_commit(tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens VN_RELE(ZTOV(xzp));
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
87e5029a3226958edab1512d6182bc74d8d80c9aahrens zap_cursor_fini(&zc);
40ff3960ec49d8bb707c8b7f0030f2ac0c014033ck if (error != ENOENT)
40ff3960ec49d8bb707c8b7f0030f2ac0c014033ck skipped += 1;
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (skipped);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensvoid
fa9e4066f08beec538e775443c5be79dd423fcabahrenszfs_rmnode(znode_t *zp)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens zfsvfs_t *zfsvfs = zp->z_zfsvfs;
fa9e4066f08beec538e775443c5be79dd423fcabahrens objset_t *os = zfsvfs->z_os;
fa9e4066f08beec538e775443c5be79dd423fcabahrens znode_t *xzp = NULL;
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_tx_t *tx;
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint64_t acl_obj;
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum uint64_t xattr_obj;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int error;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum ASSERT(zp->z_links == 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(ZTOV(zp)->v_count == 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If this is an attribute directory, purge its contents.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum if (ZTOV(zp)->v_type == VDIR && (zp->z_pflags & ZFS_XATTR)) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (zfs_purgedir(zp) != 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
893a6d32980d24be1349478f44169009d4801c25ahrens * Not enough space to delete some xattrs.
cdb0ab79ea1af7b8fc339a04d4bf7426dc77ec4emaybee * Leave it in the unlinked set.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
0e276a64239609b11bfaa358da373a942beb8f45maybee zfs_znode_dmu_fini(zp);
0e276a64239609b11bfaa358da373a942beb8f45maybee zfs_znode_free(zp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
399cc7d5d9aff97c714b708af3e3f0280ceab93fChunwei Chen } else {
cdb0ab79ea1af7b8fc339a04d4bf7426dc77ec4emaybee /*
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.
cdb0ab79ea1af7b8fc339a04d4bf7426dc77ec4emaybee */
399cc7d5d9aff97c714b708af3e3f0280ceab93fChunwei Chen error = dmu_free_long_range(os, zp->z_id, 0, DMU_OBJECT_END);
399cc7d5d9aff97c714b708af3e3f0280ceab93fChunwei Chen if (error) {
399cc7d5d9aff97c714b708af3e3f0280ceab93fChunwei Chen /*
eb721827677c553ce8dd0d4390630a857f923f98Alek Pinchuk * Not enough space or we were interrupted by unmount.
eb721827677c553ce8dd0d4390630a857f923f98Alek Pinchuk * Leave the file in the unlinked set.
399cc7d5d9aff97c714b708af3e3f0280ceab93fChunwei Chen */
399cc7d5d9aff97c714b708af3e3f0280ceab93fChunwei Chen zfs_znode_dmu_fini(zp);
399cc7d5d9aff97c714b708af3e3f0280ceab93fChunwei Chen zfs_znode_free(zp);
399cc7d5d9aff97c714b708af3e3f0280ceab93fChunwei Chen return;
399cc7d5d9aff97c714b708af3e3f0280ceab93fChunwei Chen }
cdb0ab79ea1af7b8fc339a04d4bf7426dc77ec4emaybee }
cdb0ab79ea1af7b8fc339a04d4bf7426dc77ec4emaybee
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
893a6d32980d24be1349478f44169009d4801c25ahrens * If the file has extended attributes, we're going to unlink
893a6d32980d24be1349478f44169009d4801c25ahrens * the xattr dir.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum error = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum &xattr_obj, sizeof (xattr_obj));
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum if (error == 0 && xattr_obj) {
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum error = zfs_zget(zfsvfs, xattr_obj, &xzp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(error == 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
1412a1a223b7a94990edf5114c108b0a29c3f881Mark Shellenbaum acl_obj = zfs_external_acl(zp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
cdb0ab79ea1af7b8fc339a04d4bf7426dc77ec4emaybee * Set up the final transaction.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens tx = dmu_tx_create(os);
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_tx_hold_free(tx, zp->z_id, 0, DMU_OBJECT_END);
893a6d32980d24be1349478f44169009d4801c25ahrens dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (xzp) {
893a6d32980d24be1349478f44169009d4801c25ahrens dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, TRUE, NULL);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (acl_obj)
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum zfs_sa_upgrade_txholds(tx, zp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens error = dmu_tx_assign(tx, TXG_WAIT);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (error) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
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).
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
893a6d32980d24be1349478f44169009d4801c25ahrens dmu_tx_abort(tx);
0e276a64239609b11bfaa358da373a942beb8f45maybee zfs_znode_dmu_fini(zp);
0e276a64239609b11bfaa358da373a942beb8f45maybee zfs_znode_free(zp);
0e276a64239609b11bfaa358da373a942beb8f45maybee goto out;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (xzp) {
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum ASSERT(error == 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_enter(&xzp->z_lock);
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));
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_exit(&xzp->z_lock);
893a6d32980d24be1349478f44169009d4801c25ahrens zfs_unlinked_add(xzp, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
893a6d32980d24be1349478f44169009d4801c25ahrens /* Remove this znode from the unlinked set */
b420f3adeb349714478d1a7813d2c0e069d41555Richard Lowe VERIFY3U(0, ==,
b420f3adeb349714478d1a7813d2c0e069d41555Richard Lowe zap_remove_int(zfsvfs->z_os, zfsvfs->z_unlinkedobj, zp->z_id, tx));
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens zfs_znode_delete(zp, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_tx_commit(tx);
0e276a64239609b11bfaa358da373a942beb8f45maybeeout:
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (xzp)
fa9e4066f08beec538e775443c5be79dd423fcabahrens VN_RELE(ZTOV(xzp));
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
e7437265dc2a4920c197ed4337665539d358b22cahrensstatic uint64_t
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaumzfs_dirent(znode_t *zp, uint64_t mode)
e7437265dc2a4920c197ed4337665539d358b22cahrens{
e7437265dc2a4920c197ed4337665539d358b22cahrens uint64_t de = zp->z_id;
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum
e7437265dc2a4920c197ed4337665539d358b22cahrens if (zp->z_zfsvfs->z_version >= ZPL_VERSION_DIRENT_TYPE)
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum de |= IFTODT(mode) << 60;
e7437265dc2a4920c197ed4337665539d358b22cahrens return (de);
e7437265dc2a4920c197ed4337665539d358b22cahrens}
e7437265dc2a4920c197ed4337665539d358b22cahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
893a6d32980d24be1349478f44169009d4801c25ahrens * Link zp into dl. Can only fail if zp has been unlinked.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrenszfs_link_create(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens znode_t *dzp = dl->dl_dzp;
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum zfsvfs_t *zfsvfs = zp->z_zfsvfs;
fa9e4066f08beec538e775443c5be79dd423fcabahrens vnode_t *vp = ZTOV(zp);
b1b8ab34de515a5e83206da22c3d7e563241b021lling uint64_t value;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int zp_is_dir = (vp->v_type == VDIR);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum sa_bulk_attr_t bulk[5];
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum uint64_t mtime[2], ctime[2];
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum int count = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int error;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_enter(&zp->z_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (!(flag & ZRENAMING)) {
893a6d32980d24be1349478f44169009d4801c25ahrens if (zp->z_unlinked) { /* no new links to unlinked zp */
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(!(flag & (ZNEW | ZEXISTS)));
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_exit(&zp->z_lock);
be6fd75a69ae679453d9cda5bff3326111e6d1caMatthew Ahrens return (SET_ERROR(ENOENT));
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum zp->z_links++;
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum &zp->z_links, sizeof (zp->z_links));
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum &dzp->z_id, sizeof (dzp->z_id));
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum &zp->z_pflags, sizeof (zp->z_pflags));
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum if (!(flag & ZNEW)) {
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum ctime, sizeof (ctime));
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum ctime, B_TRUE);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum }
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum ASSERT(error == 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_exit(&zp->z_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_enter(&dzp->z_lock);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum dzp->z_size++;
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum dzp->z_links += zp_is_dir;
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum count = 0;
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum &dzp->z_size, sizeof (dzp->z_size));
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum &dzp->z_links, sizeof (dzp->z_links));
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum mtime, sizeof (mtime));
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum ctime, sizeof (ctime));
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum &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);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum ASSERT(error == 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_exit(&dzp->z_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum value = zfs_dirent(zp, zp->z_mode);
fa9e4066f08beec538e775443c5be79dd423fcabahrens error = zap_add(zp->z_zfsvfs->z_os, dzp->z_id, dl->dl_name,
b1b8ab34de515a5e83206da22c3d7e563241b021lling 8, 1, &value, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(error == 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
033f983390fa5d2b54e3e09d83ac9000d71ddaaeek dnlc_update(ZTOV(dzp), dl->dl_name, vp);
033f983390fa5d2b54e3e09d83ac9000d71ddaaeek
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falknerstatic int
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falknerzfs_dropname(zfs_dirlock_t *dl, znode_t *zp, znode_t *dzp, dmu_tx_t *tx,
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner int flag)
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner{
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner int error;
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner if (zp->z_zfsvfs->z_norm) {
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner if (((zp->z_zfsvfs->z_case == ZFS_CASE_INSENSITIVE) &&
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner (flag & ZCIEXACT)) ||
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner ((zp->z_zfsvfs->z_case == ZFS_CASE_MIXED) &&
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner !(flag & ZCILOOK)))
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner error = zap_remove_norm(zp->z_zfsvfs->z_os,
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner dzp->z_id, dl->dl_name, MT_EXACT, tx);
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner else
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner error = zap_remove_norm(zp->z_zfsvfs->z_os,
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner dzp->z_id, dl->dl_name, MT_FIRST, tx);
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner } else {
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner error = zap_remove(zp->z_zfsvfs->z_os,
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner dzp->z_id, dl->dl_name, tx);
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner }
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner return (error);
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner}
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
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.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrenszfs_link_destroy(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag,
9a686fbc186e8e2a64e9a5094d44c7d6fa0ea167Paul Dagnelie boolean_t *unlinkedp)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens znode_t *dzp = dl->dl_dzp;
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
fa9e4066f08beec538e775443c5be79dd423fcabahrens vnode_t *vp = ZTOV(zp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens int zp_is_dir = (vp->v_type == VDIR);
893a6d32980d24be1349478f44169009d4801c25ahrens boolean_t unlinked = B_FALSE;
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum sa_bulk_attr_t bulk[5];
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum uint64_t mtime[2], ctime[2];
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum int count = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int error;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
033f983390fa5d2b54e3e09d83ac9000d71ddaaeek dnlc_remove(ZTOV(dzp), dl->dl_name);
033f983390fa5d2b54e3e09d83ac9000d71ddaaeek
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (!(flag & ZRENAMING)) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (vn_vfswlock(vp)) /* prevent new mounts on zp */
be6fd75a69ae679453d9cda5bff3326111e6d1caMatthew Ahrens return (SET_ERROR(EBUSY));
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (vn_ismntpt(vp)) { /* don't remove mount point */
fa9e4066f08beec538e775443c5be79dd423fcabahrens vn_vfsunlock(vp);
be6fd75a69ae679453d9cda5bff3326111e6d1caMatthew Ahrens return (SET_ERROR(EBUSY));
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_enter(&zp->z_lock);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum if (zp_is_dir && !zfs_dirempty(zp)) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_exit(&zp->z_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens vn_vfsunlock(vp);
be6fd75a69ae679453d9cda5bff3326111e6d1caMatthew Ahrens return (SET_ERROR(EEXIST));
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner /*
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.
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner */
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner error = zfs_dropname(dl, zp, dzp, tx, flag);
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner if (error != 0) {
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner mutex_exit(&zp->z_lock);
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner vn_vfsunlock(vp);
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner return (error);
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner }
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum if (zp->z_links <= zp_is_dir) {
0125049cd6136d1d2ca9e982382a915b6d7916ceahrens zfs_panic_recover("zfs: link count on %s is %u, "
0125049cd6136d1d2ca9e982382a915b6d7916ceahrens "should be at least %u",
0125049cd6136d1d2ca9e982382a915b6d7916ceahrens zp->z_vnode->v_path ? zp->z_vnode->v_path :
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum "<unknown>", (int)zp->z_links,
0125049cd6136d1d2ca9e982382a915b6d7916ceahrens zp_is_dir + 1);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum zp->z_links = zp_is_dir + 1;
0125049cd6136d1d2ca9e982382a915b6d7916ceahrens }
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum if (--zp->z_links == zp_is_dir) {
893a6d32980d24be1349478f44169009d4801c25ahrens zp->z_unlinked = B_TRUE;
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum zp->z_links = 0;
893a6d32980d24be1349478f44169009d4801c25ahrens unlinked = B_TRUE;
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else {
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs),
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum NULL, &ctime, sizeof (ctime));
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 B_TRUE);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs),
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum NULL, &zp->z_links, sizeof (zp->z_links));
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum count = 0;
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum ASSERT(error == 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_exit(&zp->z_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens vn_vfsunlock(vp);
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner } else {
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner error = zfs_dropname(dl, zp, dzp, tx, flag);
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner if (error != 0)
6ed5e6ab20c9a0a54cdfbb139e0ccae3f8527e9bSam Falkner return (error);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_enter(&dzp->z_lock);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum dzp->z_size--; /* one dirent removed */
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 NULL, &dzp->z_size, sizeof (dzp->z_size));
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs),
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum NULL, ctime, sizeof (ctime));
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs),
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum NULL, mtime, sizeof (mtime));
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);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum ASSERT(error == 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_exit(&dzp->z_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
893a6d32980d24be1349478f44169009d4801c25ahrens if (unlinkedp != NULL)
893a6d32980d24be1349478f44169009d4801c25ahrens *unlinkedp = unlinked;
893a6d32980d24be1349478f44169009d4801c25ahrens else if (unlinked)
893a6d32980d24be1349478f44169009d4801c25ahrens zfs_unlinked_add(zp, tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
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.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrensboolean_t
fa9e4066f08beec538e775443c5be79dd423fcabahrenszfs_dirempty(znode_t *dzp)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum return (dzp->z_size == 2 && dzp->z_dirlocks == 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrenszfs_make_xattrdir(znode_t *zp, vattr_t *vap, vnode_t **xvpp, cred_t *cr)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens zfsvfs_t *zfsvfs = zp->z_zfsvfs;
fa9e4066f08beec538e775443c5be79dd423fcabahrens znode_t *xzp;
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_tx_t *tx;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int error;
89459e17032b6bb1d59eebd2b7c0d06859d4657cMark Shellenbaum zfs_acl_ids_t acl_ids;
89459e17032b6bb1d59eebd2b7c0d06859d4657cMark Shellenbaum boolean_t fuid_dirtied;
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum uint64_t parent;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens *xvpp = NULL;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw if (error = zfs_zaccess(zp, ACE_WRITE_NAMED_ATTRS, 0, B_FALSE, cr))
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (error);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
89459e17032b6bb1d59eebd2b7c0d06859d4657cMark Shellenbaum if ((error = zfs_acl_ids_create(zp, IS_XATTR, vap, cr, NULL,
89459e17032b6bb1d59eebd2b7c0d06859d4657cMark Shellenbaum &acl_ids)) != 0)
89459e17032b6bb1d59eebd2b7c0d06859d4657cMark Shellenbaum return (error);
148434217c040ea38dc844384f6ba68d9b325906Matthew Ahrens if (zfs_acl_ids_overquota(zfsvfs, &acl_ids)) {
148434217c040ea38dc844384f6ba68d9b325906Matthew Ahrens zfs_acl_ids_free(&acl_ids);
be6fd75a69ae679453d9cda5bff3326111e6d1caMatthew Ahrens return (SET_ERROR(EDQUOT));
148434217c040ea38dc844384f6ba68d9b325906Matthew Ahrens }
89459e17032b6bb1d59eebd2b7c0d06859d4657cMark Shellenbaum
fa9e4066f08beec538e775443c5be79dd423fcabahrens tx = dmu_tx_create(zfsvfs->z_os);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum ZFS_SA_BASE_ATTR_SIZE);
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
89459e17032b6bb1d59eebd2b7c0d06859d4657cMark Shellenbaum fuid_dirtied = zfsvfs->z_fuid_dirty;
148434217c040ea38dc844384f6ba68d9b325906Matthew Ahrens if (fuid_dirtied)
148434217c040ea38dc844384f6ba68d9b325906Matthew Ahrens zfs_fuid_txhold(zfsvfs, tx);
e722410c49fe67cbf0f639cbcc288bd6cbcf7dd1Matthew Ahrens error = dmu_tx_assign(tx, TXG_WAIT);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (error) {
c8c24165eb6f3690a1b5b8877619e069efe5199bMark Shellenbaum zfs_acl_ids_free(&acl_ids);
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_tx_abort(tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (error);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum zfs_mknode(zp, vap, tx, cr, IS_XATTR, &xzp, &acl_ids);
89459e17032b6bb1d59eebd2b7c0d06859d4657cMark Shellenbaum
89459e17032b6bb1d59eebd2b7c0d06859d4657cMark Shellenbaum if (fuid_dirtied)
89459e17032b6bb1d59eebd2b7c0d06859d4657cMark Shellenbaum zfs_fuid_sync(zfsvfs, tx);
89459e17032b6bb1d59eebd2b7c0d06859d4657cMark Shellenbaum
f3e6fb2f4e84077db6155f4306cc8a4cb49ff512Mark Shellenbaum#ifdef DEBUG
f3e6fb2f4e84077db6155f4306cc8a4cb49ff512Mark Shellenbaum error = sa_lookup(xzp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs),
f3e6fb2f4e84077db6155f4306cc8a4cb49ff512Mark Shellenbaum &parent, sizeof (parent));
f3e6fb2f4e84077db6155f4306cc8a4cb49ff512Mark Shellenbaum ASSERT(error == 0 && parent == zp->z_id);
f3e6fb2f4e84077db6155f4306cc8a4cb49ff512Mark Shellenbaum#endif
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), &xzp->z_id,
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum sizeof (xzp->z_id), tx));
fa9e4066f08beec538e775443c5be79dd423fcabahrens
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw (void) zfs_log_create(zfsvfs->z_log, tx, TX_MKXATTR, zp,
89459e17032b6bb1d59eebd2b7c0d06859d4657cMark Shellenbaum xzp, "", NULL, acl_ids.z_fuidp, vap);
89459e17032b6bb1d59eebd2b7c0d06859d4657cMark Shellenbaum
89459e17032b6bb1d59eebd2b7c0d06859d4657cMark Shellenbaum zfs_acl_ids_free(&acl_ids);
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_tx_commit(tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens *xvpp = ZTOV(xzp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Return a znode for the extended attribute directory for zp.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * ** If the directory does not already exist, it is created **
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * IN: zp - znode to obtain attribute directory from
fa9e4066f08beec538e775443c5be79dd423fcabahrens * cr - credentials of caller
3f063a9d046be1602e680274441fdc168bba9f61ck * flags - flags from the VOP_LOOKUP call
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * OUT: xzpp - pointer to extended attribute znode
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * RETURN: 0 on success
fa9e4066f08beec538e775443c5be79dd423fcabahrens * error number on failure
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
3f063a9d046be1602e680274441fdc168bba9f61ckzfs_get_xattrdir(znode_t *zp, vnode_t **xvpp, cred_t *cr, int flags)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens zfsvfs_t *zfsvfs = zp->z_zfsvfs;
fa9e4066f08beec538e775443c5be79dd423fcabahrens znode_t *xzp;
fa9e4066f08beec538e775443c5be79dd423fcabahrens zfs_dirlock_t *dl;
fa9e4066f08beec538e775443c5be79dd423fcabahrens vattr_t va;
fa9e4066f08beec538e775443c5be79dd423fcabahrens int error;
fa9e4066f08beec538e775443c5be79dd423fcabahrenstop:
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw error = zfs_dirent_lock(&dl, zp, "", &xzp, ZXATTR, NULL, NULL);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (error)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (error);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (xzp != NULL) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens *xvpp = ZTOV(xzp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens zfs_dirent_unlock(dl);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens
3f063a9d046be1602e680274441fdc168bba9f61ck if (!(flags & CREATE_XATTR_DIR)) {
3f063a9d046be1602e680274441fdc168bba9f61ck zfs_dirent_unlock(dl);
be6fd75a69ae679453d9cda5bff3326111e6d1caMatthew Ahrens return (SET_ERROR(ENOENT));
3f063a9d046be1602e680274441fdc168bba9f61ck }
3f063a9d046be1602e680274441fdc168bba9f61ck
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens zfs_dirent_unlock(dl);
be6fd75a69ae679453d9cda5bff3326111e6d1caMatthew Ahrens return (SET_ERROR(EROFS));
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * The ability to 'create' files in an attribute
fa9e4066f08beec538e775443c5be79dd423fcabahrens * directory comes from the write_xattr permission on the base file.
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * The ability to 'search' an attribute directory requires
fa9e4066f08beec538e775443c5be79dd423fcabahrens * read_xattr permission on the base file.
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Once in a directory the ability to read/write attributes
fa9e4066f08beec538e775443c5be79dd423fcabahrens * is controlled by the permissions on the attribute file.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens va.va_mask = AT_TYPE | AT_MODE | AT_UID | AT_GID;
fa9e4066f08beec538e775443c5be79dd423fcabahrens va.va_type = VDIR;
d2443e765650e70b88cd0346e67d2aee6dd1ea3amarks va.va_mode = S_IFDIR | S_ISVTX | 0777;
bda89588bd7667394a834e8a9a34612cce2ae9c3jp zfs_fuid_map_ids(zp, cr, &va.va_uid, &va.va_gid);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens error = zfs_make_xattrdir(zp, &va, xvpp, cr);
fa9e4066f08beec538e775443c5be79dd423fcabahrens zfs_dirent_unlock(dl);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
1209a471b5681c43d839d4b890f708f500da7346Neil Perrin if (error == ERESTART) {
8a2f1b9190d1dc288470a1fd2776d79ce82cb129ahrens /* NB: we already did dmu_tx_wait() if necessary */
fa9e4066f08beec538e775443c5be79dd423fcabahrens goto top;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (error);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Decide whether it is okay to remove within a sticky directory.
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * In sticky directories, write access is not sufficient;
fa9e4066f08beec538e775443c5be79dd423fcabahrens * you can remove entries from a directory only if:
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
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 *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * The function returns 0 if remove access is granted.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrensint
fa9e4066f08beec538e775443c5be79dd423fcabahrenszfs_sticky_remove_access(znode_t *zdp, znode_t *zp, cred_t *cr)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens uid_t uid;
f1696b231bb1209e1cea95b7ff29b8c60493daa0Mark Shellenbaum uid_t downer;
f1696b231bb1209e1cea95b7ff29b8c60493daa0Mark Shellenbaum uid_t fowner;
f1696b231bb1209e1cea95b7ff29b8c60493daa0Mark Shellenbaum zfsvfs_t *zfsvfs = zdp->z_zfsvfs;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
1209a471b5681c43d839d4b890f708f500da7346Neil Perrin if (zdp->z_zfsvfs->z_replay)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
0a586cea3ceec7e5e50e7e54c745082a7a333ac2Mark Shellenbaum if ((zdp->z_mode & S_ISVTX) == 0)
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw return (0);
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw
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
f1696b231bb1209e1cea95b7ff29b8c60493daa0Mark Shellenbaum if ((uid = crgetuid(cr)) == downer || uid == fowner ||
fa9e4066f08beec538e775443c5be79dd423fcabahrens (ZTOV(zp)->v_type == VREG &&
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr) == 0))
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens else
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (secpolicy_vnode_remove(cr));
fa9e4066f08beec538e775443c5be79dd423fcabahrens}