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