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diff --git a/module/os/linux/zfs/zfs_vnops_os.c b/module/os/linux/zfs/zfs_vnops_os.c
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+++ b/module/os/linux/zfs/zfs_vnops_os.c
@@ -0,0 +1,4000 @@
+/*
+ * 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) 2012, 2018 by Delphix. All rights reserved.
+ * Copyright (c) 2015 by Chunwei Chen. All rights reserved.
+ * Copyright 2017 Nexenta Systems, Inc.
+ */
+
+/* Portions Copyright 2007 Jeremy Teo */
+/* Portions Copyright 2010 Robert Milkowski */
+
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/time.h>
+#include <sys/sysmacros.h>
+#include <sys/vfs.h>
+#include <sys/file.h>
+#include <sys/stat.h>
+#include <sys/kmem.h>
+#include <sys/taskq.h>
+#include <sys/uio.h>
+#include <sys/vmsystm.h>
+#include <sys/atomic.h>
+#include <sys/pathname.h>
+#include <sys/cmn_err.h>
+#include <sys/errno.h>
+#include <sys/zfs_dir.h>
+#include <sys/zfs_acl.h>
+#include <sys/zfs_ioctl.h>
+#include <sys/fs/zfs.h>
+#include <sys/dmu.h>
+#include <sys/dmu_objset.h>
+#include <sys/spa.h>
+#include <sys/txg.h>
+#include <sys/dbuf.h>
+#include <sys/zap.h>
+#include <sys/sa.h>
+#include <sys/policy.h>
+#include <sys/sunddi.h>
+#include <sys/sid.h>
+#include <sys/zfs_ctldir.h>
+#include <sys/zfs_fuid.h>
+#include <sys/zfs_quota.h>
+#include <sys/zfs_sa.h>
+#include <sys/zfs_vnops.h>
+#include <sys/zfs_rlock.h>
+#include <sys/cred.h>
+#include <sys/zpl.h>
+#include <sys/zil.h>
+#include <sys/sa_impl.h>
+
+/*
+ * Programming rules.
+ *
+ * Each vnode op performs some logical unit of work. To do this, the ZPL must
+ * properly lock its in-core state, create a DMU transaction, do the work,
+ * record this work in the intent log (ZIL), commit the DMU transaction,
+ * and wait for the intent log to commit if it is a synchronous operation.
+ * Moreover, the vnode ops must work in both normal and log replay context.
+ * The ordering of events is important to avoid deadlocks and references
+ * to freed memory. The example below illustrates the following Big Rules:
+ *
+ * (1) A check must be made in each zfs thread for a mounted file system.
+ * This is done avoiding races using ZFS_ENTER(zfsvfs).
+ * A ZFS_EXIT(zfsvfs) is needed before all returns. Any znodes
+ * must be checked with ZFS_VERIFY_ZP(zp). Both of these macros
+ * can return EIO from the calling function.
+ *
+ * (2) zrele() should always be the last thing except for zil_commit()
+ * (if necessary) and ZFS_EXIT(). This is for 3 reasons:
+ * First, if it's the last reference, the vnode/znode
+ * can be freed, so the zp may point to freed memory. Second, the last
+ * reference will call zfs_zinactive(), which may induce a lot of work --
+ * pushing cached pages (which acquires range locks) and syncing out
+ * cached atime changes. Third, zfs_zinactive() may require a new tx,
+ * which could deadlock the system if you were already holding one.
+ * If you must call zrele() within a tx then use zfs_zrele_async().
+ *
+ * (3) All range locks must be grabbed before calling dmu_tx_assign(),
+ * as they can span dmu_tx_assign() calls.
+ *
+ * (4) If ZPL locks are held, pass TXG_NOWAIT as the second argument to
+ * dmu_tx_assign(). This is critical because we don't want to block
+ * while holding locks.
+ *
+ * If no ZPL locks are held (aside from ZFS_ENTER()), use TXG_WAIT. This
+ * reduces lock contention and CPU usage when we must wait (note that if
+ * throughput is constrained by the storage, nearly every transaction
+ * must wait).
+ *
+ * Note, in particular, that if a lock is sometimes acquired before
+ * the tx assigns, and sometimes after (e.g. z_lock), then failing
+ * to use a non-blocking assign can deadlock the system. The scenario:
+ *
+ * Thread A has grabbed a lock before calling dmu_tx_assign().
+ * Thread B is in an already-assigned tx, and blocks for this lock.
+ * Thread A calls dmu_tx_assign(TXG_WAIT) and blocks in txg_wait_open()
+ * forever, because the previous txg can't quiesce until B's tx commits.
+ *
+ * If dmu_tx_assign() returns ERESTART and zfsvfs->z_assign is TXG_NOWAIT,
+ * then drop all locks, call dmu_tx_wait(), and try again. On subsequent
+ * calls to dmu_tx_assign(), pass TXG_NOTHROTTLE in addition to TXG_NOWAIT,
+ * to indicate that this operation has already called dmu_tx_wait().
+ * This will ensure that we don't retry forever, waiting a short bit
+ * each time.
+ *
+ * (5) If the operation succeeded, generate the intent log entry for it
+ * before dropping locks. This ensures that the ordering of events
+ * in the intent log matches the order in which they actually occurred.
+ * During ZIL replay the zfs_log_* functions will update the sequence
+ * number to indicate the zil transaction has replayed.
+ *
+ * (6) At the end of each vnode op, the DMU tx must always commit,
+ * regardless of whether there were any errors.
+ *
+ * (7) After dropping all locks, invoke zil_commit(zilog, foid)
+ * to ensure that synchronous semantics are provided when necessary.
+ *
+ * In general, this is how things should be ordered in each vnode op:
+ *
+ * ZFS_ENTER(zfsvfs); // exit if unmounted
+ * top:
+ * zfs_dirent_lock(&dl, ...) // lock directory entry (may igrab())
+ * rw_enter(...); // grab any other locks you need
+ * tx = dmu_tx_create(...); // get DMU tx
+ * dmu_tx_hold_*(); // hold each object you might modify
+ * error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
+ * if (error) {
+ * rw_exit(...); // drop locks
+ * zfs_dirent_unlock(dl); // unlock directory entry
+ * zrele(...); // release held znodes
+ * if (error == ERESTART) {
+ * waited = B_TRUE;
+ * dmu_tx_wait(tx);
+ * dmu_tx_abort(tx);
+ * goto top;
+ * }
+ * dmu_tx_abort(tx); // abort DMU tx
+ * ZFS_EXIT(zfsvfs); // finished in zfs
+ * return (error); // really out of space
+ * }
+ * error = do_real_work(); // do whatever this VOP does
+ * if (error == 0)
+ * zfs_log_*(...); // on success, make ZIL entry
+ * dmu_tx_commit(tx); // commit DMU tx -- error or not
+ * rw_exit(...); // drop locks
+ * zfs_dirent_unlock(dl); // unlock directory entry
+ * zrele(...); // release held znodes
+ * zil_commit(zilog, foid); // synchronous when necessary
+ * ZFS_EXIT(zfsvfs); // finished in zfs
+ * return (error); // done, report error
+ */
+
+/*
+ * Virus scanning is unsupported. It would be possible to add a hook
+ * here to performance the required virus scan. This could be done
+ * entirely in the kernel or potentially as an update to invoke a
+ * scanning utility.
+ */
+static int
+zfs_vscan(struct inode *ip, cred_t *cr, int async)
+{
+ return (0);
+}
+
+/* ARGSUSED */
+int
+zfs_open(struct inode *ip, int mode, int flag, cred_t *cr)
+{
+ znode_t *zp = ITOZ(ip);
+ zfsvfs_t *zfsvfs = ITOZSB(ip);
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ /* Honor ZFS_APPENDONLY file attribute */
+ if ((mode & FMODE_WRITE) && (zp->z_pflags & ZFS_APPENDONLY) &&
+ ((flag & O_APPEND) == 0)) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EPERM));
+ }
+
+ /* Virus scan eligible files on open */
+ if (!zfs_has_ctldir(zp) && zfsvfs->z_vscan && S_ISREG(ip->i_mode) &&
+ !(zp->z_pflags & ZFS_AV_QUARANTINED) && zp->z_size > 0) {
+ if (zfs_vscan(ip, cr, 0) != 0) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EACCES));
+ }
+ }
+
+ /* Keep a count of the synchronous opens in the znode */
+ if (flag & O_SYNC)
+ atomic_inc_32(&zp->z_sync_cnt);
+
+ ZFS_EXIT(zfsvfs);
+ return (0);
+}
+
+/* ARGSUSED */
+int
+zfs_close(struct inode *ip, int flag, cred_t *cr)
+{
+ znode_t *zp = ITOZ(ip);
+ zfsvfs_t *zfsvfs = ITOZSB(ip);
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ /* Decrement the synchronous opens in the znode */
+ if (flag & O_SYNC)
+ atomic_dec_32(&zp->z_sync_cnt);
+
+ if (!zfs_has_ctldir(zp) && zfsvfs->z_vscan && S_ISREG(ip->i_mode) &&
+ !(zp->z_pflags & ZFS_AV_QUARANTINED) && zp->z_size > 0)
+ VERIFY(zfs_vscan(ip, cr, 1) == 0);
+
+ ZFS_EXIT(zfsvfs);
+ return (0);
+}
+
+#if defined(_KERNEL)
+/*
+ * When a file is memory mapped, we must keep the IO data synchronized
+ * between the DMU cache and the memory mapped pages. What this means:
+ *
+ * On Write: If we find a memory mapped page, we write to *both*
+ * the page and the dmu buffer.
+ */
+void
+update_pages(znode_t *zp, int64_t start, int len, objset_t *os)
+{
+ struct inode *ip = ZTOI(zp);
+ struct address_space *mp = ip->i_mapping;
+ struct page *pp;
+ uint64_t nbytes;
+ int64_t off;
+ void *pb;
+
+ off = start & (PAGE_SIZE-1);
+ for (start &= PAGE_MASK; len > 0; start += PAGE_SIZE) {
+ nbytes = MIN(PAGE_SIZE - off, len);
+
+ pp = find_lock_page(mp, start >> PAGE_SHIFT);
+ if (pp) {
+ if (mapping_writably_mapped(mp))
+ flush_dcache_page(pp);
+
+ pb = kmap(pp);
+ (void) dmu_read(os, zp->z_id, start + off, nbytes,
+ pb + off, DMU_READ_PREFETCH);
+ kunmap(pp);
+
+ if (mapping_writably_mapped(mp))
+ flush_dcache_page(pp);
+
+ mark_page_accessed(pp);
+ SetPageUptodate(pp);
+ ClearPageError(pp);
+ unlock_page(pp);
+ put_page(pp);
+ }
+
+ len -= nbytes;
+ off = 0;
+ }
+}
+
+/*
+ * When a file is memory mapped, we must keep the IO data synchronized
+ * between the DMU cache and the memory mapped pages. What this means:
+ *
+ * On Read: We "read" preferentially from memory mapped pages,
+ * else we default from the dmu buffer.
+ *
+ * NOTE: We will always "break up" the IO into PAGESIZE uiomoves when
+ * the file is memory mapped.
+ */
+int
+mappedread(znode_t *zp, int nbytes, uio_t *uio)
+{
+ struct inode *ip = ZTOI(zp);
+ struct address_space *mp = ip->i_mapping;
+ struct page *pp;
+ int64_t start, off;
+ uint64_t bytes;
+ int len = nbytes;
+ int error = 0;
+ void *pb;
+
+ start = uio->uio_loffset;
+ off = start & (PAGE_SIZE-1);
+ for (start &= PAGE_MASK; len > 0; start += PAGE_SIZE) {
+ bytes = MIN(PAGE_SIZE - off, len);
+
+ pp = find_lock_page(mp, start >> PAGE_SHIFT);
+ if (pp) {
+ ASSERT(PageUptodate(pp));
+ unlock_page(pp);
+
+ pb = kmap(pp);
+ error = uiomove(pb + off, bytes, UIO_READ, uio);
+ kunmap(pp);
+
+ if (mapping_writably_mapped(mp))
+ flush_dcache_page(pp);
+
+ mark_page_accessed(pp);
+ put_page(pp);
+ } else {
+ error = dmu_read_uio_dbuf(sa_get_db(zp->z_sa_hdl),
+ uio, bytes);
+ }
+
+ len -= bytes;
+ off = 0;
+ if (error)
+ break;
+ }
+ return (error);
+}
+#endif /* _KERNEL */
+
+unsigned long zfs_delete_blocks = DMU_MAX_DELETEBLKCNT;
+
+/*
+ * Write the bytes to a file.
+ *
+ * IN: zp - znode of file to be written to
+ * data - bytes to write
+ * len - number of bytes to write
+ * pos - offset to start writing at
+ *
+ * OUT: resid - remaining bytes to write
+ *
+ * RETURN: 0 if success
+ * positive error code if failure. EIO is returned
+ * for a short write when residp isn't provided.
+ *
+ * Timestamps:
+ * zp - ctime|mtime updated if byte count > 0
+ */
+int
+zfs_write_simple(znode_t *zp, const void *data, size_t len,
+ loff_t pos, size_t *residp)
+{
+ fstrans_cookie_t cookie;
+ int error;
+
+ struct iovec iov;
+ iov.iov_base = (void *)data;
+ iov.iov_len = len;
+
+ uio_t uio;
+ uio_iovec_init(&uio, &iov, 1, pos, UIO_SYSSPACE, len, 0);
+
+ cookie = spl_fstrans_mark();
+ error = zfs_write(zp, &uio, 0, kcred);
+ spl_fstrans_unmark(cookie);
+
+ if (error == 0) {
+ if (residp != NULL)
+ *residp = uio_resid(&uio);
+ else if (uio_resid(&uio) != 0)
+ error = SET_ERROR(EIO);
+ }
+
+ return (error);
+}
+
+void
+zfs_zrele_async(znode_t *zp)
+{
+ struct inode *ip = ZTOI(zp);
+ objset_t *os = ITOZSB(ip)->z_os;
+
+ ASSERT(atomic_read(&ip->i_count) > 0);
+ ASSERT(os != NULL);
+
+ if (atomic_read(&ip->i_count) == 1)
+ VERIFY(taskq_dispatch(dsl_pool_zrele_taskq(dmu_objset_pool(os)),
+ (task_func_t *)iput, ip, TQ_SLEEP) != TASKQID_INVALID);
+ else
+ zrele(zp);
+}
+
+
+/*
+ * Lookup an entry in a directory, or an extended attribute directory.
+ * If it exists, return a held inode reference for it.
+ *
+ * IN: zdp - znode of directory to search.
+ * nm - name of entry to lookup.
+ * flags - LOOKUP_XATTR set if looking for an attribute.
+ * cr - credentials of caller.
+ * direntflags - directory lookup flags
+ * realpnp - returned pathname.
+ *
+ * OUT: zpp - znode of located entry, NULL if not found.
+ *
+ * RETURN: 0 on success, error code on failure.
+ *
+ * Timestamps:
+ * NA
+ */
+/* ARGSUSED */
+int
+zfs_lookup(znode_t *zdp, char *nm, znode_t **zpp, int flags, cred_t *cr,
+ int *direntflags, pathname_t *realpnp)
+{
+ zfsvfs_t *zfsvfs = ZTOZSB(zdp);
+ int error = 0;
+
+ /*
+ * Fast path lookup, however we must skip DNLC lookup
+ * for case folding or normalizing lookups because the
+ * DNLC code only stores the passed in name. This means
+ * creating 'a' and removing 'A' on a case insensitive
+ * file system would work, but DNLC still thinks 'a'
+ * exists and won't let you create it again on the next
+ * pass through fast path.
+ */
+ if (!(flags & (LOOKUP_XATTR | FIGNORECASE))) {
+
+ if (!S_ISDIR(ZTOI(zdp)->i_mode)) {
+ return (SET_ERROR(ENOTDIR));
+ } else if (zdp->z_sa_hdl == NULL) {
+ return (SET_ERROR(EIO));
+ }
+
+ if (nm[0] == 0 || (nm[0] == '.' && nm[1] == '\0')) {
+ error = zfs_fastaccesschk_execute(zdp, cr);
+ if (!error) {
+ *zpp = zdp;
+ zhold(*zpp);
+ return (0);
+ }
+ return (error);
+ }
+ }
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zdp);
+
+ *zpp = NULL;
+
+ if (flags & LOOKUP_XATTR) {
+ /*
+ * We don't allow recursive attributes..
+ * Maybe someday we will.
+ */
+ if (zdp->z_pflags & ZFS_XATTR) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EINVAL));
+ }
+
+ if ((error = zfs_get_xattrdir(zdp, zpp, cr, flags))) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ /*
+ * Do we have permission to get into attribute directory?
+ */
+
+ if ((error = zfs_zaccess(*zpp, ACE_EXECUTE, 0,
+ B_FALSE, cr))) {
+ zrele(*zpp);
+ *zpp = NULL;
+ }
+
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ if (!S_ISDIR(ZTOI(zdp)->i_mode)) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(ENOTDIR));
+ }
+
+ /*
+ * Check accessibility of directory.
+ */
+
+ if ((error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr))) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ if (zfsvfs->z_utf8 && u8_validate(nm, strlen(nm),
+ NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EILSEQ));
+ }
+
+ error = zfs_dirlook(zdp, nm, zpp, flags, direntflags, realpnp);
+ if ((error == 0) && (*zpp))
+ zfs_inode_update(*zpp);
+
+ ZFS_EXIT(zfsvfs);
+ return (error);
+}
+
+/*
+ * Attempt to create a new entry in a directory. If the entry
+ * already exists, truncate the file if permissible, else return
+ * an error. Return the ip of the created or trunc'd file.
+ *
+ * IN: dzp - znode of directory to put new file entry in.
+ * name - name of new file entry.
+ * vap - attributes of new file.
+ * excl - flag indicating exclusive or non-exclusive mode.
+ * mode - mode to open file with.
+ * cr - credentials of caller.
+ * flag - file flag.
+ * vsecp - ACL to be set
+ *
+ * OUT: zpp - znode of created or trunc'd entry.
+ *
+ * RETURN: 0 on success, error code on failure.
+ *
+ * Timestamps:
+ * dzp - ctime|mtime updated if new entry created
+ * zp - ctime|mtime always, atime if new
+ */
+
+/* ARGSUSED */
+int
+zfs_create(znode_t *dzp, char *name, vattr_t *vap, int excl,
+ int mode, znode_t **zpp, cred_t *cr, int flag, vsecattr_t *vsecp)
+{
+ znode_t *zp;
+ zfsvfs_t *zfsvfs = ZTOZSB(dzp);
+ zilog_t *zilog;
+ objset_t *os;
+ zfs_dirlock_t *dl;
+ dmu_tx_t *tx;
+ int error;
+ uid_t uid;
+ gid_t gid;
+ zfs_acl_ids_t acl_ids;
+ boolean_t fuid_dirtied;
+ boolean_t have_acl = B_FALSE;
+ boolean_t waited = B_FALSE;
+
+ /*
+ * If we have an ephemeral id, ACL, or XVATTR then
+ * make sure file system is at proper version
+ */
+
+ gid = crgetgid(cr);
+ uid = crgetuid(cr);
+
+ if (zfsvfs->z_use_fuids == B_FALSE &&
+ (vsecp || IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid)))
+ return (SET_ERROR(EINVAL));
+
+ if (name == NULL)
+ return (SET_ERROR(EINVAL));
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(dzp);
+ os = zfsvfs->z_os;
+ zilog = zfsvfs->z_log;
+
+ if (zfsvfs->z_utf8 && u8_validate(name, strlen(name),
+ NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EILSEQ));
+ }
+
+ if (vap->va_mask & ATTR_XVATTR) {
+ if ((error = secpolicy_xvattr((xvattr_t *)vap,
+ crgetuid(cr), cr, vap->va_mode)) != 0) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+ }
+
+top:
+ *zpp = NULL;
+ if (*name == '\0') {
+ /*
+ * Null component name refers to the directory itself.
+ */
+ zhold(dzp);
+ zp = dzp;
+ dl = NULL;
+ error = 0;
+ } else {
+ /* possible igrab(zp) */
+ int zflg = 0;
+
+ if (flag & FIGNORECASE)
+ zflg |= ZCILOOK;
+
+ error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
+ NULL, NULL);
+ if (error) {
+ if (have_acl)
+ zfs_acl_ids_free(&acl_ids);
+ if (strcmp(name, "..") == 0)
+ error = SET_ERROR(EISDIR);
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+ }
+
+ if (zp == NULL) {
+ uint64_t txtype;
+ uint64_t projid = ZFS_DEFAULT_PROJID;
+
+ /*
+ * Create a new file object and update the directory
+ * to reference it.
+ */
+ if ((error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
+ if (have_acl)
+ zfs_acl_ids_free(&acl_ids);
+ goto out;
+ }
+
+ /*
+ * We only support the creation of regular files in
+ * extended attribute directories.
+ */
+
+ if ((dzp->z_pflags & ZFS_XATTR) && !S_ISREG(vap->va_mode)) {
+ if (have_acl)
+ zfs_acl_ids_free(&acl_ids);
+ error = SET_ERROR(EINVAL);
+ goto out;
+ }
+
+ if (!have_acl && (error = zfs_acl_ids_create(dzp, 0, vap,
+ cr, vsecp, &acl_ids)) != 0)
+ goto out;
+ have_acl = B_TRUE;
+
+ if (S_ISREG(vap->va_mode) || S_ISDIR(vap->va_mode))
+ projid = zfs_inherit_projid(dzp);
+ if (zfs_acl_ids_overquota(zfsvfs, &acl_ids, projid)) {
+ zfs_acl_ids_free(&acl_ids);
+ error = SET_ERROR(EDQUOT);
+ goto out;
+ }
+
+ tx = dmu_tx_create(os);
+
+ dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
+ ZFS_SA_BASE_ATTR_SIZE);
+
+ fuid_dirtied = zfsvfs->z_fuid_dirty;
+ if (fuid_dirtied)
+ zfs_fuid_txhold(zfsvfs, tx);
+ dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
+ dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE);
+ if (!zfsvfs->z_use_sa &&
+ acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
+ dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
+ 0, acl_ids.z_aclp->z_acl_bytes);
+ }
+
+ error = dmu_tx_assign(tx,
+ (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
+ if (error) {
+ zfs_dirent_unlock(dl);
+ if (error == ERESTART) {
+ waited = B_TRUE;
+ dmu_tx_wait(tx);
+ dmu_tx_abort(tx);
+ goto top;
+ }
+ zfs_acl_ids_free(&acl_ids);
+ dmu_tx_abort(tx);
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+ zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);
+
+ error = zfs_link_create(dl, zp, tx, ZNEW);
+ if (error != 0) {
+ /*
+ * Since, we failed to add the directory entry for it,
+ * delete the newly created dnode.
+ */
+ zfs_znode_delete(zp, tx);
+ remove_inode_hash(ZTOI(zp));
+ zfs_acl_ids_free(&acl_ids);
+ dmu_tx_commit(tx);
+ goto out;
+ }
+
+ if (fuid_dirtied)
+ zfs_fuid_sync(zfsvfs, tx);
+
+ txtype = zfs_log_create_txtype(Z_FILE, vsecp, vap);
+ if (flag & FIGNORECASE)
+ txtype |= TX_CI;
+ zfs_log_create(zilog, tx, txtype, dzp, zp, name,
+ vsecp, acl_ids.z_fuidp, vap);
+ zfs_acl_ids_free(&acl_ids);
+ dmu_tx_commit(tx);
+ } else {
+ int aflags = (flag & O_APPEND) ? V_APPEND : 0;
+
+ if (have_acl)
+ zfs_acl_ids_free(&acl_ids);
+ have_acl = B_FALSE;
+
+ /*
+ * A directory entry already exists for this name.
+ */
+ /*
+ * Can't truncate an existing file if in exclusive mode.
+ */
+ if (excl) {
+ error = SET_ERROR(EEXIST);
+ goto out;
+ }
+ /*
+ * Can't open a directory for writing.
+ */
+ if (S_ISDIR(ZTOI(zp)->i_mode)) {
+ error = SET_ERROR(EISDIR);
+ goto out;
+ }
+ /*
+ * Verify requested access to file.
+ */
+ if (mode && (error = zfs_zaccess_rwx(zp, mode, aflags, cr))) {
+ goto out;
+ }
+
+ mutex_enter(&dzp->z_lock);
+ dzp->z_seq++;
+ mutex_exit(&dzp->z_lock);
+
+ /*
+ * Truncate regular files if requested.
+ */
+ if (S_ISREG(ZTOI(zp)->i_mode) &&
+ (vap->va_mask & ATTR_SIZE) && (vap->va_size == 0)) {
+ /* we can't hold any locks when calling zfs_freesp() */
+ if (dl) {
+ zfs_dirent_unlock(dl);
+ dl = NULL;
+ }
+ error = zfs_freesp(zp, 0, 0, mode, TRUE);
+ }
+ }
+out:
+
+ if (dl)
+ zfs_dirent_unlock(dl);
+
+ if (error) {
+ if (zp)
+ zrele(zp);
+ } else {
+ zfs_inode_update(dzp);
+ zfs_inode_update(zp);
+ *zpp = zp;
+ }
+
+ if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
+ zil_commit(zilog, 0);
+
+ ZFS_EXIT(zfsvfs);
+ return (error);
+}
+
+/* ARGSUSED */
+int
+zfs_tmpfile(struct inode *dip, vattr_t *vap, int excl,
+ int mode, struct inode **ipp, cred_t *cr, int flag, vsecattr_t *vsecp)
+{
+ znode_t *zp = NULL, *dzp = ITOZ(dip);
+ zfsvfs_t *zfsvfs = ITOZSB(dip);
+ objset_t *os;
+ dmu_tx_t *tx;
+ int error;
+ uid_t uid;
+ gid_t gid;
+ zfs_acl_ids_t acl_ids;
+ uint64_t projid = ZFS_DEFAULT_PROJID;
+ boolean_t fuid_dirtied;
+ boolean_t have_acl = B_FALSE;
+ boolean_t waited = B_FALSE;
+
+ /*
+ * If we have an ephemeral id, ACL, or XVATTR then
+ * make sure file system is at proper version
+ */
+
+ gid = crgetgid(cr);
+ uid = crgetuid(cr);
+
+ if (zfsvfs->z_use_fuids == B_FALSE &&
+ (vsecp || IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid)))
+ return (SET_ERROR(EINVAL));
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(dzp);
+ os = zfsvfs->z_os;
+
+ if (vap->va_mask & ATTR_XVATTR) {
+ if ((error = secpolicy_xvattr((xvattr_t *)vap,
+ crgetuid(cr), cr, vap->va_mode)) != 0) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+ }
+
+top:
+ *ipp = NULL;
+
+ /*
+ * Create a new file object and update the directory
+ * to reference it.
+ */
+ if ((error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
+ if (have_acl)
+ zfs_acl_ids_free(&acl_ids);
+ goto out;
+ }
+
+ if (!have_acl && (error = zfs_acl_ids_create(dzp, 0, vap,
+ cr, vsecp, &acl_ids)) != 0)
+ goto out;
+ have_acl = B_TRUE;
+
+ if (S_ISREG(vap->va_mode) || S_ISDIR(vap->va_mode))
+ projid = zfs_inherit_projid(dzp);
+ if (zfs_acl_ids_overquota(zfsvfs, &acl_ids, projid)) {
+ zfs_acl_ids_free(&acl_ids);
+ error = SET_ERROR(EDQUOT);
+ goto out;
+ }
+
+ tx = dmu_tx_create(os);
+
+ dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
+ ZFS_SA_BASE_ATTR_SIZE);
+ dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
+
+ fuid_dirtied = zfsvfs->z_fuid_dirty;
+ if (fuid_dirtied)
+ zfs_fuid_txhold(zfsvfs, tx);
+ if (!zfsvfs->z_use_sa &&
+ acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
+ dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
+ 0, acl_ids.z_aclp->z_acl_bytes);
+ }
+ error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
+ if (error) {
+ if (error == ERESTART) {
+ waited = B_TRUE;
+ dmu_tx_wait(tx);
+ dmu_tx_abort(tx);
+ goto top;
+ }
+ zfs_acl_ids_free(&acl_ids);
+ dmu_tx_abort(tx);
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+ zfs_mknode(dzp, vap, tx, cr, IS_TMPFILE, &zp, &acl_ids);
+
+ if (fuid_dirtied)
+ zfs_fuid_sync(zfsvfs, tx);
+
+ /* Add to unlinked set */
+ zp->z_unlinked = B_TRUE;
+ zfs_unlinked_add(zp, tx);
+ zfs_acl_ids_free(&acl_ids);
+ dmu_tx_commit(tx);
+out:
+
+ if (error) {
+ if (zp)
+ zrele(zp);
+ } else {
+ zfs_inode_update(dzp);
+ zfs_inode_update(zp);
+ *ipp = ZTOI(zp);
+ }
+
+ ZFS_EXIT(zfsvfs);
+ return (error);
+}
+
+/*
+ * Remove an entry from a directory.
+ *
+ * IN: dzp - znode of directory to remove entry from.
+ * name - name of entry to remove.
+ * cr - credentials of caller.
+ * flags - case flags.
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * Timestamps:
+ * dzp - ctime|mtime
+ * ip - ctime (if nlink > 0)
+ */
+
+uint64_t null_xattr = 0;
+
+/*ARGSUSED*/
+int
+zfs_remove(znode_t *dzp, char *name, cred_t *cr, int flags)
+{
+ znode_t *zp;
+ znode_t *xzp;
+ zfsvfs_t *zfsvfs = ZTOZSB(dzp);
+ zilog_t *zilog;
+ uint64_t acl_obj, xattr_obj;
+ uint64_t xattr_obj_unlinked = 0;
+ uint64_t obj = 0;
+ uint64_t links;
+ zfs_dirlock_t *dl;
+ dmu_tx_t *tx;
+ boolean_t may_delete_now, delete_now = FALSE;
+ boolean_t unlinked, toobig = FALSE;
+ uint64_t txtype;
+ pathname_t *realnmp = NULL;
+ pathname_t realnm;
+ int error;
+ int zflg = ZEXISTS;
+ boolean_t waited = B_FALSE;
+
+ if (name == NULL)
+ return (SET_ERROR(EINVAL));
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(dzp);
+ zilog = zfsvfs->z_log;
+
+ if (flags & FIGNORECASE) {
+ zflg |= ZCILOOK;
+ pn_alloc(&realnm);
+ realnmp = &realnm;
+ }
+
+top:
+ xattr_obj = 0;
+ xzp = NULL;
+ /*
+ * Attempt to lock directory; fail if entry doesn't exist.
+ */
+ if ((error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
+ NULL, realnmp))) {
+ if (realnmp)
+ pn_free(realnmp);
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ if ((error = zfs_zaccess_delete(dzp, zp, cr))) {
+ goto out;
+ }
+
+ /*
+ * Need to use rmdir for removing directories.
+ */
+ if (S_ISDIR(ZTOI(zp)->i_mode)) {
+ error = SET_ERROR(EPERM);
+ goto out;
+ }
+
+ mutex_enter(&zp->z_lock);
+ may_delete_now = atomic_read(&ZTOI(zp)->i_count) == 1 &&
+ !(zp->z_is_mapped);
+ mutex_exit(&zp->z_lock);
+
+ /*
+ * We may delete the znode now, or we may put it in the unlinked set;
+ * it depends on whether we're the last link, and on whether there are
+ * other holds on the inode. So we dmu_tx_hold() the right things to
+ * allow for either case.
+ */
+ obj = zp->z_id;
+ tx = dmu_tx_create(zfsvfs->z_os);
+ dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name);
+ dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
+ zfs_sa_upgrade_txholds(tx, zp);
+ zfs_sa_upgrade_txholds(tx, dzp);
+ if (may_delete_now) {
+ toobig = zp->z_size > zp->z_blksz * zfs_delete_blocks;
+ /* if the file is too big, only hold_free a token amount */
+ dmu_tx_hold_free(tx, zp->z_id, 0,
+ (toobig ? DMU_MAX_ACCESS : DMU_OBJECT_END));
+ }
+
+ /* are there any extended attributes? */
+ 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);
+ ASSERT0(error);
+ dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
+ dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE);
+ }
+
+ mutex_enter(&zp->z_lock);
+ if ((acl_obj = zfs_external_acl(zp)) != 0 && may_delete_now)
+ dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END);
+ mutex_exit(&zp->z_lock);
+
+ /* charge as an update -- would be nice not to charge at all */
+ dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
+
+ /*
+ * Mark this transaction as typically resulting in a net free of space
+ */
+ dmu_tx_mark_netfree(tx);
+
+ error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
+ if (error) {
+ zfs_dirent_unlock(dl);
+ if (error == ERESTART) {
+ waited = B_TRUE;
+ dmu_tx_wait(tx);
+ dmu_tx_abort(tx);
+ zrele(zp);
+ if (xzp)
+ zrele(xzp);
+ goto top;
+ }
+ if (realnmp)
+ pn_free(realnmp);
+ dmu_tx_abort(tx);
+ zrele(zp);
+ if (xzp)
+ zrele(xzp);
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ /*
+ * Remove the directory entry.
+ */
+ error = zfs_link_destroy(dl, zp, tx, zflg, &unlinked);
+
+ if (error) {
+ dmu_tx_commit(tx);
+ goto out;
+ }
+
+ if (unlinked) {
+ /*
+ * Hold z_lock so that we can make sure that the ACL obj
+ * hasn't changed. Could have been deleted due to
+ * zfs_sa_upgrade().
+ */
+ mutex_enter(&zp->z_lock);
+ (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
+ &xattr_obj_unlinked, sizeof (xattr_obj_unlinked));
+ delete_now = may_delete_now && !toobig &&
+ atomic_read(&ZTOI(zp)->i_count) == 1 &&
+ !(zp->z_is_mapped) && xattr_obj == xattr_obj_unlinked &&
+ zfs_external_acl(zp) == acl_obj;
+ }
+
+ if (delete_now) {
+ if (xattr_obj_unlinked) {
+ ASSERT3U(ZTOI(xzp)->i_nlink, ==, 2);
+ mutex_enter(&xzp->z_lock);
+ xzp->z_unlinked = B_TRUE;
+ clear_nlink(ZTOI(xzp));
+ links = 0;
+ error = sa_update(xzp->z_sa_hdl, SA_ZPL_LINKS(zfsvfs),
+ &links, sizeof (links), tx);
+ ASSERT3U(error, ==, 0);
+ mutex_exit(&xzp->z_lock);
+ zfs_unlinked_add(xzp, tx);
+
+ if (zp->z_is_sa)
+ error = sa_remove(zp->z_sa_hdl,
+ SA_ZPL_XATTR(zfsvfs), tx);
+ else
+ error = sa_update(zp->z_sa_hdl,
+ SA_ZPL_XATTR(zfsvfs), &null_xattr,
+ sizeof (uint64_t), tx);
+ ASSERT0(error);
+ }
+ /*
+ * Add to the unlinked set because a new reference could be
+ * taken concurrently resulting in a deferred destruction.
+ */
+ zfs_unlinked_add(zp, tx);
+ mutex_exit(&zp->z_lock);
+ } else if (unlinked) {
+ mutex_exit(&zp->z_lock);
+ zfs_unlinked_add(zp, tx);
+ }
+
+ txtype = TX_REMOVE;
+ if (flags & FIGNORECASE)
+ txtype |= TX_CI;
+ zfs_log_remove(zilog, tx, txtype, dzp, name, obj, unlinked);
+
+ dmu_tx_commit(tx);
+out:
+ if (realnmp)
+ pn_free(realnmp);
+
+ zfs_dirent_unlock(dl);
+ zfs_inode_update(dzp);
+ zfs_inode_update(zp);
+
+ if (delete_now)
+ zrele(zp);
+ else
+ zfs_zrele_async(zp);
+
+ if (xzp) {
+ zfs_inode_update(xzp);
+ zfs_zrele_async(xzp);
+ }
+
+ if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
+ zil_commit(zilog, 0);
+
+ ZFS_EXIT(zfsvfs);
+ return (error);
+}
+
+/*
+ * Create a new directory and insert it into dzp using the name
+ * provided. Return a pointer to the inserted directory.
+ *
+ * IN: dzp - znode of directory to add subdir to.
+ * dirname - name of new directory.
+ * vap - attributes of new directory.
+ * cr - credentials of caller.
+ * flags - case flags.
+ * vsecp - ACL to be set
+ *
+ * OUT: zpp - znode of created directory.
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * Timestamps:
+ * dzp - ctime|mtime updated
+ * zpp - ctime|mtime|atime updated
+ */
+/*ARGSUSED*/
+int
+zfs_mkdir(znode_t *dzp, char *dirname, vattr_t *vap, znode_t **zpp,
+ cred_t *cr, int flags, vsecattr_t *vsecp)
+{
+ znode_t *zp;
+ zfsvfs_t *zfsvfs = ZTOZSB(dzp);
+ zilog_t *zilog;
+ zfs_dirlock_t *dl;
+ uint64_t txtype;
+ dmu_tx_t *tx;
+ int error;
+ int zf = ZNEW;
+ uid_t uid;
+ gid_t gid = crgetgid(cr);
+ zfs_acl_ids_t acl_ids;
+ boolean_t fuid_dirtied;
+ boolean_t waited = B_FALSE;
+
+ ASSERT(S_ISDIR(vap->va_mode));
+
+ /*
+ * If we have an ephemeral id, ACL, or XVATTR then
+ * make sure file system is at proper version
+ */
+
+ uid = crgetuid(cr);
+ if (zfsvfs->z_use_fuids == B_FALSE &&
+ (vsecp || IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid)))
+ return (SET_ERROR(EINVAL));
+
+ if (dirname == NULL)
+ return (SET_ERROR(EINVAL));
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(dzp);
+ zilog = zfsvfs->z_log;
+
+ if (dzp->z_pflags & ZFS_XATTR) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EINVAL));
+ }
+
+ if (zfsvfs->z_utf8 && u8_validate(dirname,
+ strlen(dirname), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EILSEQ));
+ }
+ if (flags & FIGNORECASE)
+ zf |= ZCILOOK;
+
+ if (vap->va_mask & ATTR_XVATTR) {
+ if ((error = secpolicy_xvattr((xvattr_t *)vap,
+ crgetuid(cr), cr, vap->va_mode)) != 0) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+ }
+
+ if ((error = zfs_acl_ids_create(dzp, 0, vap, cr,
+ vsecp, &acl_ids)) != 0) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+ /*
+ * First make sure the new directory doesn't exist.
+ *
+ * Existence is checked first to make sure we don't return
+ * EACCES instead of EEXIST which can cause some applications
+ * to fail.
+ */
+top:
+ *zpp = NULL;
+
+ if ((error = zfs_dirent_lock(&dl, dzp, dirname, &zp, zf,
+ NULL, NULL))) {
+ zfs_acl_ids_free(&acl_ids);
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ if ((error = zfs_zaccess(dzp, ACE_ADD_SUBDIRECTORY, 0, B_FALSE, cr))) {
+ zfs_acl_ids_free(&acl_ids);
+ zfs_dirent_unlock(dl);
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ if (zfs_acl_ids_overquota(zfsvfs, &acl_ids, zfs_inherit_projid(dzp))) {
+ zfs_acl_ids_free(&acl_ids);
+ zfs_dirent_unlock(dl);
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EDQUOT));
+ }
+
+ /*
+ * Add a new entry to the directory.
+ */
+ tx = dmu_tx_create(zfsvfs->z_os);
+ dmu_tx_hold_zap(tx, dzp->z_id, TRUE, dirname);
+ dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
+ fuid_dirtied = zfsvfs->z_fuid_dirty;
+ if (fuid_dirtied)
+ zfs_fuid_txhold(zfsvfs, tx);
+ if (!zfsvfs->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
+ dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
+ acl_ids.z_aclp->z_acl_bytes);
+ }
+
+ dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
+ ZFS_SA_BASE_ATTR_SIZE);
+
+ error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
+ if (error) {
+ zfs_dirent_unlock(dl);
+ if (error == ERESTART) {
+ waited = B_TRUE;
+ dmu_tx_wait(tx);
+ dmu_tx_abort(tx);
+ goto top;
+ }
+ zfs_acl_ids_free(&acl_ids);
+ dmu_tx_abort(tx);
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ /*
+ * Create new node.
+ */
+ zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);
+
+ /*
+ * Now put new name in parent dir.
+ */
+ error = zfs_link_create(dl, zp, tx, ZNEW);
+ if (error != 0) {
+ zfs_znode_delete(zp, tx);
+ remove_inode_hash(ZTOI(zp));
+ goto out;
+ }
+
+ if (fuid_dirtied)
+ zfs_fuid_sync(zfsvfs, tx);
+
+ *zpp = zp;
+
+ txtype = zfs_log_create_txtype(Z_DIR, vsecp, vap);
+ if (flags & FIGNORECASE)
+ txtype |= TX_CI;
+ zfs_log_create(zilog, tx, txtype, dzp, zp, dirname, vsecp,
+ acl_ids.z_fuidp, vap);
+
+out:
+ zfs_acl_ids_free(&acl_ids);
+
+ dmu_tx_commit(tx);
+
+ zfs_dirent_unlock(dl);
+
+ if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
+ zil_commit(zilog, 0);
+
+ if (error != 0) {
+ zrele(zp);
+ } else {
+ zfs_inode_update(dzp);
+ zfs_inode_update(zp);
+ }
+ ZFS_EXIT(zfsvfs);
+ return (error);
+}
+
+/*
+ * Remove a directory subdir entry. If the current working
+ * directory is the same as the subdir to be removed, the
+ * remove will fail.
+ *
+ * IN: dzp - znode of directory to remove from.
+ * name - name of directory to be removed.
+ * cwd - inode of current working directory.
+ * cr - credentials of caller.
+ * flags - case flags
+ *
+ * RETURN: 0 on success, error code on failure.
+ *
+ * Timestamps:
+ * dzp - ctime|mtime updated
+ */
+/*ARGSUSED*/
+int
+zfs_rmdir(znode_t *dzp, char *name, znode_t *cwd, cred_t *cr,
+ int flags)
+{
+ znode_t *zp;
+ zfsvfs_t *zfsvfs = ZTOZSB(dzp);
+ zilog_t *zilog;
+ zfs_dirlock_t *dl;
+ dmu_tx_t *tx;
+ int error;
+ int zflg = ZEXISTS;
+ boolean_t waited = B_FALSE;
+
+ if (name == NULL)
+ return (SET_ERROR(EINVAL));
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(dzp);
+ zilog = zfsvfs->z_log;
+
+ if (flags & FIGNORECASE)
+ zflg |= ZCILOOK;
+top:
+ zp = NULL;
+
+ /*
+ * Attempt to lock directory; fail if entry doesn't exist.
+ */
+ if ((error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
+ NULL, NULL))) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ if ((error = zfs_zaccess_delete(dzp, zp, cr))) {
+ goto out;
+ }
+
+ if (!S_ISDIR(ZTOI(zp)->i_mode)) {
+ error = SET_ERROR(ENOTDIR);
+ goto out;
+ }
+
+ if (zp == cwd) {
+ error = SET_ERROR(EINVAL);
+ goto out;
+ }
+
+ /*
+ * Grab a lock on the directory to make sure that no one is
+ * trying to add (or lookup) entries while we are removing it.
+ */
+ rw_enter(&zp->z_name_lock, RW_WRITER);
+
+ /*
+ * Grab a lock on the parent pointer to make sure we play well
+ * with the treewalk and directory rename code.
+ */
+ rw_enter(&zp->z_parent_lock, RW_WRITER);
+
+ tx = dmu_tx_create(zfsvfs->z_os);
+ dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name);
+ dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
+ dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
+ zfs_sa_upgrade_txholds(tx, zp);
+ zfs_sa_upgrade_txholds(tx, dzp);
+ dmu_tx_mark_netfree(tx);
+ error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
+ if (error) {
+ rw_exit(&zp->z_parent_lock);
+ rw_exit(&zp->z_name_lock);
+ zfs_dirent_unlock(dl);
+ if (error == ERESTART) {
+ waited = B_TRUE;
+ dmu_tx_wait(tx);
+ dmu_tx_abort(tx);
+ zrele(zp);
+ goto top;
+ }
+ dmu_tx_abort(tx);
+ zrele(zp);
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ error = zfs_link_destroy(dl, zp, tx, zflg, NULL);
+
+ if (error == 0) {
+ uint64_t txtype = TX_RMDIR;
+ if (flags & FIGNORECASE)
+ txtype |= TX_CI;
+ zfs_log_remove(zilog, tx, txtype, dzp, name, ZFS_NO_OBJECT,
+ B_FALSE);
+ }
+
+ dmu_tx_commit(tx);
+
+ rw_exit(&zp->z_parent_lock);
+ rw_exit(&zp->z_name_lock);
+out:
+ zfs_dirent_unlock(dl);
+
+ zfs_inode_update(dzp);
+ zfs_inode_update(zp);
+ zrele(zp);
+
+ if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
+ zil_commit(zilog, 0);
+
+ ZFS_EXIT(zfsvfs);
+ return (error);
+}
+
+/*
+ * Read directory entries from the given directory cursor position and emit
+ * name and position for each entry.
+ *
+ * IN: ip - inode of directory to read.
+ * ctx - directory entry context.
+ * cr - credentials of caller.
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * Timestamps:
+ * ip - atime updated
+ *
+ * Note that the low 4 bits of the cookie returned by zap is always zero.
+ * This allows us to use the low range for "special" directory entries:
+ * We use 0 for '.', and 1 for '..'. If this is the root of the filesystem,
+ * we use the offset 2 for the '.zfs' directory.
+ */
+/* ARGSUSED */
+int
+zfs_readdir(struct inode *ip, zpl_dir_context_t *ctx, cred_t *cr)
+{
+ znode_t *zp = ITOZ(ip);
+ zfsvfs_t *zfsvfs = ITOZSB(ip);
+ objset_t *os;
+ zap_cursor_t zc;
+ zap_attribute_t zap;
+ int error;
+ uint8_t prefetch;
+ uint8_t type;
+ int done = 0;
+ uint64_t parent;
+ uint64_t offset; /* must be unsigned; checks for < 1 */
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs),
+ &parent, sizeof (parent))) != 0)
+ goto out;
+
+ /*
+ * Quit if directory has been removed (posix)
+ */
+ if (zp->z_unlinked)
+ goto out;
+
+ error = 0;
+ os = zfsvfs->z_os;
+ offset = ctx->pos;
+ prefetch = zp->z_zn_prefetch;
+
+ /*
+ * Initialize the iterator cursor.
+ */
+ if (offset <= 3) {
+ /*
+ * Start iteration from the beginning of the directory.
+ */
+ zap_cursor_init(&zc, os, zp->z_id);
+ } else {
+ /*
+ * The offset is a serialized cursor.
+ */
+ zap_cursor_init_serialized(&zc, os, zp->z_id, offset);
+ }
+
+ /*
+ * Transform to file-system independent format
+ */
+ while (!done) {
+ uint64_t objnum;
+ /*
+ * Special case `.', `..', and `.zfs'.
+ */
+ if (offset == 0) {
+ (void) strcpy(zap.za_name, ".");
+ zap.za_normalization_conflict = 0;
+ objnum = zp->z_id;
+ type = DT_DIR;
+ } else if (offset == 1) {
+ (void) strcpy(zap.za_name, "..");
+ zap.za_normalization_conflict = 0;
+ objnum = parent;
+ type = DT_DIR;
+ } else if (offset == 2 && zfs_show_ctldir(zp)) {
+ (void) strcpy(zap.za_name, ZFS_CTLDIR_NAME);
+ zap.za_normalization_conflict = 0;
+ objnum = ZFSCTL_INO_ROOT;
+ type = DT_DIR;
+ } else {
+ /*
+ * Grab next entry.
+ */
+ if ((error = zap_cursor_retrieve(&zc, &zap))) {
+ if (error == ENOENT)
+ break;
+ else
+ goto update;
+ }
+
+ /*
+ * 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 (zap.za_integer_length != 8 ||
+ zap.za_num_integers == 0) {
+ cmn_err(CE_WARN, "zap_readdir: bad directory "
+ "entry, obj = %lld, offset = %lld, "
+ "length = %d, num = %lld\n",
+ (u_longlong_t)zp->z_id,
+ (u_longlong_t)offset,
+ zap.za_integer_length,
+ (u_longlong_t)zap.za_num_integers);
+ error = SET_ERROR(ENXIO);
+ goto update;
+ }
+
+ objnum = ZFS_DIRENT_OBJ(zap.za_first_integer);
+ type = ZFS_DIRENT_TYPE(zap.za_first_integer);
+ }
+
+ done = !zpl_dir_emit(ctx, zap.za_name, strlen(zap.za_name),
+ objnum, type);
+ if (done)
+ break;
+
+ /* Prefetch znode */
+ if (prefetch) {
+ dmu_prefetch(os, objnum, 0, 0, 0,
+ ZIO_PRIORITY_SYNC_READ);
+ }
+
+ /*
+ * Move to the next entry, fill in the previous offset.
+ */
+ if (offset > 2 || (offset == 2 && !zfs_show_ctldir(zp))) {
+ zap_cursor_advance(&zc);
+ offset = zap_cursor_serialize(&zc);
+ } else {
+ offset += 1;
+ }
+ ctx->pos = offset;
+ }
+ zp->z_zn_prefetch = B_FALSE; /* a lookup will re-enable pre-fetching */
+
+update:
+ zap_cursor_fini(&zc);
+ if (error == ENOENT)
+ error = 0;
+out:
+ ZFS_EXIT(zfsvfs);
+
+ return (error);
+}
+
+/*
+ * Get the basic file attributes and place them in the provided kstat
+ * structure. The inode is assumed to be the authoritative source
+ * for most of the attributes. However, the znode currently has the
+ * authoritative atime, blksize, and block count.
+ *
+ * IN: ip - inode of file.
+ *
+ * OUT: sp - kstat values.
+ *
+ * RETURN: 0 (always succeeds)
+ */
+/* ARGSUSED */
+int
+zfs_getattr_fast(struct inode *ip, struct kstat *sp)
+{
+ znode_t *zp = ITOZ(ip);
+ zfsvfs_t *zfsvfs = ITOZSB(ip);
+ uint32_t blksize;
+ u_longlong_t nblocks;
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ mutex_enter(&zp->z_lock);
+
+ generic_fillattr(ip, sp);
+ /*
+ * +1 link count for root inode with visible '.zfs' directory.
+ */
+ if ((zp->z_id == zfsvfs->z_root) && zfs_show_ctldir(zp))
+ if (sp->nlink < ZFS_LINK_MAX)
+ sp->nlink++;
+
+ sa_object_size(zp->z_sa_hdl, &blksize, &nblocks);
+ sp->blksize = blksize;
+ sp->blocks = nblocks;
+
+ if (unlikely(zp->z_blksz == 0)) {
+ /*
+ * Block size hasn't been set; suggest maximal I/O transfers.
+ */
+ sp->blksize = zfsvfs->z_max_blksz;
+ }
+
+ mutex_exit(&zp->z_lock);
+
+ /*
+ * Required to prevent NFS client from detecting different inode
+ * numbers of snapshot root dentry before and after snapshot mount.
+ */
+ if (zfsvfs->z_issnap) {
+ if (ip->i_sb->s_root->d_inode == ip)
+ sp->ino = ZFSCTL_INO_SNAPDIRS -
+ dmu_objset_id(zfsvfs->z_os);
+ }
+
+ ZFS_EXIT(zfsvfs);
+
+ return (0);
+}
+
+/*
+ * For the operation of changing file's user/group/project, we need to
+ * handle not only the main object that is assigned to the file directly,
+ * but also the ones that are used by the file via hidden xattr directory.
+ *
+ * Because the xattr directory may contains many EA entries, as to it may
+ * be impossible to change all of them via the transaction of changing the
+ * main object's user/group/project attributes. Then we have to change them
+ * via other multiple independent transactions one by one. It may be not good
+ * solution, but we have no better idea yet.
+ */
+static int
+zfs_setattr_dir(znode_t *dzp)
+{
+ struct inode *dxip = ZTOI(dzp);
+ struct inode *xip = NULL;
+ zfsvfs_t *zfsvfs = ZTOZSB(dzp);
+ objset_t *os = zfsvfs->z_os;
+ zap_cursor_t zc;
+ zap_attribute_t zap;
+ zfs_dirlock_t *dl;
+ znode_t *zp = NULL;
+ dmu_tx_t *tx = NULL;
+ uint64_t uid, gid;
+ sa_bulk_attr_t bulk[4];
+ int count;
+ int err;
+
+ zap_cursor_init(&zc, os, dzp->z_id);
+ while ((err = zap_cursor_retrieve(&zc, &zap)) == 0) {
+ count = 0;
+ if (zap.za_integer_length != 8 || zap.za_num_integers != 1) {
+ err = ENXIO;
+ break;
+ }
+
+ err = zfs_dirent_lock(&dl, dzp, (char *)zap.za_name, &zp,
+ ZEXISTS, NULL, NULL);
+ if (err == ENOENT)
+ goto next;
+ if (err)
+ break;
+
+ xip = ZTOI(zp);
+ if (KUID_TO_SUID(xip->i_uid) == KUID_TO_SUID(dxip->i_uid) &&
+ KGID_TO_SGID(xip->i_gid) == KGID_TO_SGID(dxip->i_gid) &&
+ zp->z_projid == dzp->z_projid)
+ goto next;
+
+ tx = dmu_tx_create(os);
+ if (!(zp->z_pflags & ZFS_PROJID))
+ dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
+ else
+ dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
+
+ err = dmu_tx_assign(tx, TXG_WAIT);
+ if (err)
+ break;
+
+ mutex_enter(&dzp->z_lock);
+
+ if (KUID_TO_SUID(xip->i_uid) != KUID_TO_SUID(dxip->i_uid)) {
+ xip->i_uid = dxip->i_uid;
+ uid = zfs_uid_read(dxip);
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
+ &uid, sizeof (uid));
+ }
+
+ if (KGID_TO_SGID(xip->i_gid) != KGID_TO_SGID(dxip->i_gid)) {
+ xip->i_gid = dxip->i_gid;
+ gid = zfs_gid_read(dxip);
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL,
+ &gid, sizeof (gid));
+ }
+
+ if (zp->z_projid != dzp->z_projid) {
+ if (!(zp->z_pflags & ZFS_PROJID)) {
+ zp->z_pflags |= ZFS_PROJID;
+ SA_ADD_BULK_ATTR(bulk, count,
+ SA_ZPL_FLAGS(zfsvfs), NULL, &zp->z_pflags,
+ sizeof (zp->z_pflags));
+ }
+
+ zp->z_projid = dzp->z_projid;
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PROJID(zfsvfs),
+ NULL, &zp->z_projid, sizeof (zp->z_projid));
+ }
+
+ mutex_exit(&dzp->z_lock);
+
+ if (likely(count > 0)) {
+ err = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
+ dmu_tx_commit(tx);
+ } else {
+ dmu_tx_abort(tx);
+ }
+ tx = NULL;
+ if (err != 0 && err != ENOENT)
+ break;
+
+next:
+ if (zp) {
+ zrele(zp);
+ zp = NULL;
+ zfs_dirent_unlock(dl);
+ }
+ zap_cursor_advance(&zc);
+ }
+
+ if (tx)
+ dmu_tx_abort(tx);
+ if (zp) {
+ zrele(zp);
+ zfs_dirent_unlock(dl);
+ }
+ zap_cursor_fini(&zc);
+
+ return (err == ENOENT ? 0 : err);
+}
+
+/*
+ * Set the file attributes to the values contained in the
+ * vattr structure.
+ *
+ * IN: zp - znode of file to be modified.
+ * vap - new attribute values.
+ * If ATTR_XVATTR set, then optional attrs are being set
+ * flags - ATTR_UTIME set if non-default time values provided.
+ * - ATTR_NOACLCHECK (CIFS context only).
+ * cr - credentials of caller.
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * Timestamps:
+ * ip - ctime updated, mtime updated if size changed.
+ */
+/* ARGSUSED */
+int
+zfs_setattr(znode_t *zp, vattr_t *vap, int flags, cred_t *cr)
+{
+ struct inode *ip;
+ zfsvfs_t *zfsvfs = ZTOZSB(zp);
+ objset_t *os = zfsvfs->z_os;
+ zilog_t *zilog;
+ dmu_tx_t *tx;
+ vattr_t oldva;
+ xvattr_t *tmpxvattr;
+ uint_t mask = vap->va_mask;
+ uint_t saved_mask = 0;
+ int trim_mask = 0;
+ uint64_t new_mode;
+ uint64_t new_kuid = 0, new_kgid = 0, new_uid, new_gid;
+ uint64_t xattr_obj;
+ uint64_t mtime[2], ctime[2], atime[2];
+ uint64_t projid = ZFS_INVALID_PROJID;
+ znode_t *attrzp;
+ int need_policy = FALSE;
+ int err, err2 = 0;
+ zfs_fuid_info_t *fuidp = NULL;
+ xvattr_t *xvap = (xvattr_t *)vap; /* vap may be an xvattr_t * */
+ xoptattr_t *xoap;
+ zfs_acl_t *aclp;
+ boolean_t skipaclchk = (flags & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
+ boolean_t fuid_dirtied = B_FALSE;
+ boolean_t handle_eadir = B_FALSE;
+ sa_bulk_attr_t *bulk, *xattr_bulk;
+ int count = 0, xattr_count = 0, bulks = 8;
+
+ if (mask == 0)
+ return (0);
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+ ip = ZTOI(zp);
+
+ /*
+ * If this is a xvattr_t, then get a pointer to the structure of
+ * optional attributes. If this is NULL, then we have a vattr_t.
+ */
+ xoap = xva_getxoptattr(xvap);
+ if (xoap != NULL && (mask & ATTR_XVATTR)) {
+ if (XVA_ISSET_REQ(xvap, XAT_PROJID)) {
+ if (!dmu_objset_projectquota_enabled(os) ||
+ (!S_ISREG(ip->i_mode) && !S_ISDIR(ip->i_mode))) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(ENOTSUP));
+ }
+
+ projid = xoap->xoa_projid;
+ if (unlikely(projid == ZFS_INVALID_PROJID)) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EINVAL));
+ }
+
+ if (projid == zp->z_projid && zp->z_pflags & ZFS_PROJID)
+ projid = ZFS_INVALID_PROJID;
+ else
+ need_policy = TRUE;
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_PROJINHERIT) &&
+ (xoap->xoa_projinherit !=
+ ((zp->z_pflags & ZFS_PROJINHERIT) != 0)) &&
+ (!dmu_objset_projectquota_enabled(os) ||
+ (!S_ISREG(ip->i_mode) && !S_ISDIR(ip->i_mode)))) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(ENOTSUP));
+ }
+ }
+
+ zilog = zfsvfs->z_log;
+
+ /*
+ * Make sure that if we have ephemeral uid/gid or xvattr specified
+ * that file system is at proper version level
+ */
+
+ if (zfsvfs->z_use_fuids == B_FALSE &&
+ (((mask & ATTR_UID) && IS_EPHEMERAL(vap->va_uid)) ||
+ ((mask & ATTR_GID) && IS_EPHEMERAL(vap->va_gid)) ||
+ (mask & ATTR_XVATTR))) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EINVAL));
+ }
+
+ if (mask & ATTR_SIZE && S_ISDIR(ip->i_mode)) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EISDIR));
+ }
+
+ if (mask & ATTR_SIZE && !S_ISREG(ip->i_mode) && !S_ISFIFO(ip->i_mode)) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EINVAL));
+ }
+
+ tmpxvattr = kmem_alloc(sizeof (xvattr_t), KM_SLEEP);
+ xva_init(tmpxvattr);
+
+ bulk = kmem_alloc(sizeof (sa_bulk_attr_t) * bulks, KM_SLEEP);
+ xattr_bulk = kmem_alloc(sizeof (sa_bulk_attr_t) * bulks, KM_SLEEP);
+
+ /*
+ * Immutable files can only alter immutable bit and atime
+ */
+ if ((zp->z_pflags & ZFS_IMMUTABLE) &&
+ ((mask & (ATTR_SIZE|ATTR_UID|ATTR_GID|ATTR_MTIME|ATTR_MODE)) ||
+ ((mask & ATTR_XVATTR) && XVA_ISSET_REQ(xvap, XAT_CREATETIME)))) {
+ err = SET_ERROR(EPERM);
+ goto out3;
+ }
+
+ if ((mask & ATTR_SIZE) && (zp->z_pflags & ZFS_READONLY)) {
+ err = SET_ERROR(EPERM);
+ goto out3;
+ }
+
+ /*
+ * Verify timestamps doesn't overflow 32 bits.
+ * ZFS can handle large timestamps, but 32bit syscalls can't
+ * handle times greater than 2039. This check should be removed
+ * once large timestamps are fully supported.
+ */
+ if (mask & (ATTR_ATIME | ATTR_MTIME)) {
+ if (((mask & ATTR_ATIME) &&
+ TIMESPEC_OVERFLOW(&vap->va_atime)) ||
+ ((mask & ATTR_MTIME) &&
+ TIMESPEC_OVERFLOW(&vap->va_mtime))) {
+ err = SET_ERROR(EOVERFLOW);
+ goto out3;
+ }
+ }
+
+top:
+ attrzp = NULL;
+ aclp = NULL;
+
+ /* Can this be moved to before the top label? */
+ if (zfs_is_readonly(zfsvfs)) {
+ err = SET_ERROR(EROFS);
+ goto out3;
+ }
+
+ /*
+ * First validate permissions
+ */
+
+ if (mask & ATTR_SIZE) {
+ err = zfs_zaccess(zp, ACE_WRITE_DATA, 0, skipaclchk, cr);
+ if (err)
+ goto out3;
+
+ /*
+ * XXX - Note, we are not providing any open
+ * mode flags here (like FNDELAY), so we may
+ * block if there are locks present... this
+ * should be addressed in openat().
+ */
+ /* XXX - would it be OK to generate a log record here? */
+ err = zfs_freesp(zp, vap->va_size, 0, 0, FALSE);
+ if (err)
+ goto out3;
+ }
+
+ if (mask & (ATTR_ATIME|ATTR_MTIME) ||
+ ((mask & ATTR_XVATTR) && (XVA_ISSET_REQ(xvap, XAT_HIDDEN) ||
+ XVA_ISSET_REQ(xvap, XAT_READONLY) ||
+ XVA_ISSET_REQ(xvap, XAT_ARCHIVE) ||
+ XVA_ISSET_REQ(xvap, XAT_OFFLINE) ||
+ XVA_ISSET_REQ(xvap, XAT_SPARSE) ||
+ XVA_ISSET_REQ(xvap, XAT_CREATETIME) ||
+ XVA_ISSET_REQ(xvap, XAT_SYSTEM)))) {
+ need_policy = zfs_zaccess(zp, ACE_WRITE_ATTRIBUTES, 0,
+ skipaclchk, cr);
+ }
+
+ if (mask & (ATTR_UID|ATTR_GID)) {
+ int idmask = (mask & (ATTR_UID|ATTR_GID));
+ int take_owner;
+ int take_group;
+
+ /*
+ * NOTE: even if a new mode is being set,
+ * we may clear S_ISUID/S_ISGID bits.
+ */
+
+ if (!(mask & ATTR_MODE))
+ vap->va_mode = zp->z_mode;
+
+ /*
+ * Take ownership or chgrp to group we are a member of
+ */
+
+ take_owner = (mask & ATTR_UID) && (vap->va_uid == crgetuid(cr));
+ take_group = (mask & ATTR_GID) &&
+ zfs_groupmember(zfsvfs, vap->va_gid, cr);
+
+ /*
+ * If both ATTR_UID and ATTR_GID are set then take_owner and
+ * take_group must both be set in order to allow taking
+ * ownership.
+ *
+ * Otherwise, send the check through secpolicy_vnode_setattr()
+ *
+ */
+
+ if (((idmask == (ATTR_UID|ATTR_GID)) &&
+ take_owner && take_group) ||
+ ((idmask == ATTR_UID) && take_owner) ||
+ ((idmask == ATTR_GID) && take_group)) {
+ if (zfs_zaccess(zp, ACE_WRITE_OWNER, 0,
+ skipaclchk, cr) == 0) {
+ /*
+ * Remove setuid/setgid for non-privileged users
+ */
+ (void) secpolicy_setid_clear(vap, cr);
+ trim_mask = (mask & (ATTR_UID|ATTR_GID));
+ } else {
+ need_policy = TRUE;
+ }
+ } else {
+ need_policy = TRUE;
+ }
+ }
+
+ mutex_enter(&zp->z_lock);
+ oldva.va_mode = zp->z_mode;
+ zfs_fuid_map_ids(zp, cr, &oldva.va_uid, &oldva.va_gid);
+ if (mask & ATTR_XVATTR) {
+ /*
+ * Update xvattr mask to include only those attributes
+ * that are actually changing.
+ *
+ * the bits will be restored prior to actually setting
+ * the attributes so the caller thinks they were set.
+ */
+ if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
+ if (xoap->xoa_appendonly !=
+ ((zp->z_pflags & ZFS_APPENDONLY) != 0)) {
+ need_policy = TRUE;
+ } else {
+ XVA_CLR_REQ(xvap, XAT_APPENDONLY);
+ XVA_SET_REQ(tmpxvattr, XAT_APPENDONLY);
+ }
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_PROJINHERIT)) {
+ if (xoap->xoa_projinherit !=
+ ((zp->z_pflags & ZFS_PROJINHERIT) != 0)) {
+ need_policy = TRUE;
+ } else {
+ XVA_CLR_REQ(xvap, XAT_PROJINHERIT);
+ XVA_SET_REQ(tmpxvattr, XAT_PROJINHERIT);
+ }
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
+ if (xoap->xoa_nounlink !=
+ ((zp->z_pflags & ZFS_NOUNLINK) != 0)) {
+ need_policy = TRUE;
+ } else {
+ XVA_CLR_REQ(xvap, XAT_NOUNLINK);
+ XVA_SET_REQ(tmpxvattr, XAT_NOUNLINK);
+ }
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
+ if (xoap->xoa_immutable !=
+ ((zp->z_pflags & ZFS_IMMUTABLE) != 0)) {
+ need_policy = TRUE;
+ } else {
+ XVA_CLR_REQ(xvap, XAT_IMMUTABLE);
+ XVA_SET_REQ(tmpxvattr, XAT_IMMUTABLE);
+ }
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
+ if (xoap->xoa_nodump !=
+ ((zp->z_pflags & ZFS_NODUMP) != 0)) {
+ need_policy = TRUE;
+ } else {
+ XVA_CLR_REQ(xvap, XAT_NODUMP);
+ XVA_SET_REQ(tmpxvattr, XAT_NODUMP);
+ }
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
+ if (xoap->xoa_av_modified !=
+ ((zp->z_pflags & ZFS_AV_MODIFIED) != 0)) {
+ need_policy = TRUE;
+ } else {
+ XVA_CLR_REQ(xvap, XAT_AV_MODIFIED);
+ XVA_SET_REQ(tmpxvattr, XAT_AV_MODIFIED);
+ }
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
+ if ((!S_ISREG(ip->i_mode) &&
+ xoap->xoa_av_quarantined) ||
+ xoap->xoa_av_quarantined !=
+ ((zp->z_pflags & ZFS_AV_QUARANTINED) != 0)) {
+ need_policy = TRUE;
+ } else {
+ XVA_CLR_REQ(xvap, XAT_AV_QUARANTINED);
+ XVA_SET_REQ(tmpxvattr, XAT_AV_QUARANTINED);
+ }
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
+ mutex_exit(&zp->z_lock);
+ err = SET_ERROR(EPERM);
+ goto out3;
+ }
+
+ if (need_policy == FALSE &&
+ (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP) ||
+ XVA_ISSET_REQ(xvap, XAT_OPAQUE))) {
+ need_policy = TRUE;
+ }
+ }
+
+ mutex_exit(&zp->z_lock);
+
+ if (mask & ATTR_MODE) {
+ if (zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr) == 0) {
+ err = secpolicy_setid_setsticky_clear(ip, vap,
+ &oldva, cr);
+ if (err)
+ goto out3;
+
+ trim_mask |= ATTR_MODE;
+ } else {
+ need_policy = TRUE;
+ }
+ }
+
+ if (need_policy) {
+ /*
+ * If trim_mask is set then take ownership
+ * has been granted or write_acl is present and user
+ * has the ability to modify mode. In that case remove
+ * UID|GID and or MODE from mask so that
+ * secpolicy_vnode_setattr() doesn't revoke it.
+ */
+
+ if (trim_mask) {
+ saved_mask = vap->va_mask;
+ vap->va_mask &= ~trim_mask;
+ }
+ err = secpolicy_vnode_setattr(cr, ip, vap, &oldva, flags,
+ (int (*)(void *, int, cred_t *))zfs_zaccess_unix, zp);
+ if (err)
+ goto out3;
+
+ if (trim_mask)
+ vap->va_mask |= saved_mask;
+ }
+
+ /*
+ * secpolicy_vnode_setattr, or take ownership may have
+ * changed va_mask
+ */
+ mask = vap->va_mask;
+
+ if ((mask & (ATTR_UID | ATTR_GID)) || projid != ZFS_INVALID_PROJID) {
+ handle_eadir = B_TRUE;
+ err = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
+ &xattr_obj, sizeof (xattr_obj));
+
+ if (err == 0 && xattr_obj) {
+ err = zfs_zget(ZTOZSB(zp), xattr_obj, &attrzp);
+ if (err)
+ goto out2;
+ }
+ if (mask & ATTR_UID) {
+ new_kuid = zfs_fuid_create(zfsvfs,
+ (uint64_t)vap->va_uid, cr, ZFS_OWNER, &fuidp);
+ if (new_kuid != KUID_TO_SUID(ZTOI(zp)->i_uid) &&
+ zfs_id_overquota(zfsvfs, DMU_USERUSED_OBJECT,
+ new_kuid)) {
+ if (attrzp)
+ zrele(attrzp);
+ err = SET_ERROR(EDQUOT);
+ goto out2;
+ }
+ }
+
+ if (mask & ATTR_GID) {
+ new_kgid = zfs_fuid_create(zfsvfs,
+ (uint64_t)vap->va_gid, cr, ZFS_GROUP, &fuidp);
+ if (new_kgid != KGID_TO_SGID(ZTOI(zp)->i_gid) &&
+ zfs_id_overquota(zfsvfs, DMU_GROUPUSED_OBJECT,
+ new_kgid)) {
+ if (attrzp)
+ zrele(attrzp);
+ err = SET_ERROR(EDQUOT);
+ goto out2;
+ }
+ }
+
+ if (projid != ZFS_INVALID_PROJID &&
+ zfs_id_overquota(zfsvfs, DMU_PROJECTUSED_OBJECT, projid)) {
+ if (attrzp)
+ zrele(attrzp);
+ err = EDQUOT;
+ goto out2;
+ }
+ }
+ tx = dmu_tx_create(os);
+
+ if (mask & ATTR_MODE) {
+ uint64_t pmode = zp->z_mode;
+ uint64_t acl_obj;
+ new_mode = (pmode & S_IFMT) | (vap->va_mode & ~S_IFMT);
+
+ if (ZTOZSB(zp)->z_acl_mode == ZFS_ACL_RESTRICTED &&
+ !(zp->z_pflags & ZFS_ACL_TRIVIAL)) {
+ err = EPERM;
+ goto out;
+ }
+
+ if ((err = zfs_acl_chmod_setattr(zp, &aclp, new_mode)))
+ goto out;
+
+ mutex_enter(&zp->z_lock);
+ if (!zp->z_is_sa && ((acl_obj = zfs_external_acl(zp)) != 0)) {
+ /*
+ * Are we upgrading ACL from old V0 format
+ * to V1 format?
+ */
+ if (zfsvfs->z_version >= ZPL_VERSION_FUID &&
+ zfs_znode_acl_version(zp) ==
+ ZFS_ACL_VERSION_INITIAL) {
+ dmu_tx_hold_free(tx, acl_obj, 0,
+ DMU_OBJECT_END);
+ dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
+ 0, aclp->z_acl_bytes);
+ } else {
+ dmu_tx_hold_write(tx, acl_obj, 0,
+ aclp->z_acl_bytes);
+ }
+ } else if (!zp->z_is_sa && aclp->z_acl_bytes > ZFS_ACE_SPACE) {
+ dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
+ 0, aclp->z_acl_bytes);
+ }
+ mutex_exit(&zp->z_lock);
+ dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
+ } else {
+ if (((mask & ATTR_XVATTR) &&
+ XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) ||
+ (projid != ZFS_INVALID_PROJID &&
+ !(zp->z_pflags & ZFS_PROJID)))
+ dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
+ else
+ dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
+ }
+
+ if (attrzp) {
+ dmu_tx_hold_sa(tx, attrzp->z_sa_hdl, B_FALSE);
+ }
+
+ fuid_dirtied = zfsvfs->z_fuid_dirty;
+ if (fuid_dirtied)
+ zfs_fuid_txhold(zfsvfs, tx);
+
+ zfs_sa_upgrade_txholds(tx, zp);
+
+ err = dmu_tx_assign(tx, TXG_WAIT);
+ if (err)
+ goto out;
+
+ count = 0;
+ /*
+ * Set each attribute requested.
+ * We group settings according to the locks they need to acquire.
+ *
+ * Note: you cannot set ctime directly, although it will be
+ * updated as a side-effect of calling this function.
+ */
+
+ if (projid != ZFS_INVALID_PROJID && !(zp->z_pflags & ZFS_PROJID)) {
+ /*
+ * For the existed object that is upgraded from old system,
+ * its on-disk layout has no slot for the project ID attribute.
+ * But quota accounting logic needs to access related slots by
+ * offset directly. So we need to adjust old objects' layout
+ * to make the project ID to some unified and fixed offset.
+ */
+ if (attrzp)
+ err = sa_add_projid(attrzp->z_sa_hdl, tx, projid);
+ if (err == 0)
+ err = sa_add_projid(zp->z_sa_hdl, tx, projid);
+
+ if (unlikely(err == EEXIST))
+ err = 0;
+ else if (err != 0)
+ goto out;
+ else
+ projid = ZFS_INVALID_PROJID;
+ }
+
+ if (mask & (ATTR_UID|ATTR_GID|ATTR_MODE))
+ mutex_enter(&zp->z_acl_lock);
+ mutex_enter(&zp->z_lock);
+
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
+ &zp->z_pflags, sizeof (zp->z_pflags));
+
+ if (attrzp) {
+ if (mask & (ATTR_UID|ATTR_GID|ATTR_MODE))
+ mutex_enter(&attrzp->z_acl_lock);
+ mutex_enter(&attrzp->z_lock);
+ SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
+ SA_ZPL_FLAGS(zfsvfs), NULL, &attrzp->z_pflags,
+ sizeof (attrzp->z_pflags));
+ if (projid != ZFS_INVALID_PROJID) {
+ attrzp->z_projid = projid;
+ SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
+ SA_ZPL_PROJID(zfsvfs), NULL, &attrzp->z_projid,
+ sizeof (attrzp->z_projid));
+ }
+ }
+
+ if (mask & (ATTR_UID|ATTR_GID)) {
+
+ if (mask & ATTR_UID) {
+ ZTOI(zp)->i_uid = SUID_TO_KUID(new_kuid);
+ new_uid = zfs_uid_read(ZTOI(zp));
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
+ &new_uid, sizeof (new_uid));
+ if (attrzp) {
+ SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
+ SA_ZPL_UID(zfsvfs), NULL, &new_uid,
+ sizeof (new_uid));
+ ZTOI(attrzp)->i_uid = SUID_TO_KUID(new_uid);
+ }
+ }
+
+ if (mask & ATTR_GID) {
+ ZTOI(zp)->i_gid = SGID_TO_KGID(new_kgid);
+ new_gid = zfs_gid_read(ZTOI(zp));
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs),
+ NULL, &new_gid, sizeof (new_gid));
+ if (attrzp) {
+ SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
+ SA_ZPL_GID(zfsvfs), NULL, &new_gid,
+ sizeof (new_gid));
+ ZTOI(attrzp)->i_gid = SGID_TO_KGID(new_kgid);
+ }
+ }
+ if (!(mask & ATTR_MODE)) {
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs),
+ NULL, &new_mode, sizeof (new_mode));
+ new_mode = zp->z_mode;
+ }
+ err = zfs_acl_chown_setattr(zp);
+ ASSERT(err == 0);
+ if (attrzp) {
+ err = zfs_acl_chown_setattr(attrzp);
+ ASSERT(err == 0);
+ }
+ }
+
+ if (mask & ATTR_MODE) {
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
+ &new_mode, sizeof (new_mode));
+ zp->z_mode = ZTOI(zp)->i_mode = new_mode;
+ ASSERT3P(aclp, !=, NULL);
+ err = zfs_aclset_common(zp, aclp, cr, tx);
+ ASSERT0(err);
+ if (zp->z_acl_cached)
+ zfs_acl_free(zp->z_acl_cached);
+ zp->z_acl_cached = aclp;
+ aclp = NULL;
+ }
+
+ if ((mask & ATTR_ATIME) || zp->z_atime_dirty) {
+ zp->z_atime_dirty = B_FALSE;
+ ZFS_TIME_ENCODE(&ip->i_atime, atime);
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL,
+ &atime, sizeof (atime));
+ }
+
+ if (mask & (ATTR_MTIME | ATTR_SIZE)) {
+ ZFS_TIME_ENCODE(&vap->va_mtime, mtime);
+ ZTOI(zp)->i_mtime = zpl_inode_timestamp_truncate(
+ vap->va_mtime, ZTOI(zp));
+
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL,
+ mtime, sizeof (mtime));
+ }
+
+ if (mask & (ATTR_CTIME | ATTR_SIZE)) {
+ ZFS_TIME_ENCODE(&vap->va_ctime, ctime);
+ ZTOI(zp)->i_ctime = zpl_inode_timestamp_truncate(vap->va_ctime,
+ ZTOI(zp));
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
+ ctime, sizeof (ctime));
+ }
+
+ if (projid != ZFS_INVALID_PROJID) {
+ zp->z_projid = projid;
+ SA_ADD_BULK_ATTR(bulk, count,
+ SA_ZPL_PROJID(zfsvfs), NULL, &zp->z_projid,
+ sizeof (zp->z_projid));
+ }
+
+ if (attrzp && mask) {
+ SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
+ SA_ZPL_CTIME(zfsvfs), NULL, &ctime,
+ sizeof (ctime));
+ }
+
+ /*
+ * Do this after setting timestamps to prevent timestamp
+ * update from toggling bit
+ */
+
+ if (xoap && (mask & ATTR_XVATTR)) {
+
+ /*
+ * restore trimmed off masks
+ * so that return masks can be set for caller.
+ */
+
+ if (XVA_ISSET_REQ(tmpxvattr, XAT_APPENDONLY)) {
+ XVA_SET_REQ(xvap, XAT_APPENDONLY);
+ }
+ if (XVA_ISSET_REQ(tmpxvattr, XAT_NOUNLINK)) {
+ XVA_SET_REQ(xvap, XAT_NOUNLINK);
+ }
+ if (XVA_ISSET_REQ(tmpxvattr, XAT_IMMUTABLE)) {
+ XVA_SET_REQ(xvap, XAT_IMMUTABLE);
+ }
+ if (XVA_ISSET_REQ(tmpxvattr, XAT_NODUMP)) {
+ XVA_SET_REQ(xvap, XAT_NODUMP);
+ }
+ if (XVA_ISSET_REQ(tmpxvattr, XAT_AV_MODIFIED)) {
+ XVA_SET_REQ(xvap, XAT_AV_MODIFIED);
+ }
+ if (XVA_ISSET_REQ(tmpxvattr, XAT_AV_QUARANTINED)) {
+ XVA_SET_REQ(xvap, XAT_AV_QUARANTINED);
+ }
+ if (XVA_ISSET_REQ(tmpxvattr, XAT_PROJINHERIT)) {
+ XVA_SET_REQ(xvap, XAT_PROJINHERIT);
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP))
+ ASSERT(S_ISREG(ip->i_mode));
+
+ zfs_xvattr_set(zp, xvap, tx);
+ }
+
+ if (fuid_dirtied)
+ zfs_fuid_sync(zfsvfs, tx);
+
+ if (mask != 0)
+ zfs_log_setattr(zilog, tx, TX_SETATTR, zp, vap, mask, fuidp);
+
+ mutex_exit(&zp->z_lock);
+ if (mask & (ATTR_UID|ATTR_GID|ATTR_MODE))
+ mutex_exit(&zp->z_acl_lock);
+
+ if (attrzp) {
+ if (mask & (ATTR_UID|ATTR_GID|ATTR_MODE))
+ mutex_exit(&attrzp->z_acl_lock);
+ mutex_exit(&attrzp->z_lock);
+ }
+out:
+ if (err == 0 && xattr_count > 0) {
+ err2 = sa_bulk_update(attrzp->z_sa_hdl, xattr_bulk,
+ xattr_count, tx);
+ ASSERT(err2 == 0);
+ }
+
+ if (aclp)
+ zfs_acl_free(aclp);
+
+ if (fuidp) {
+ zfs_fuid_info_free(fuidp);
+ fuidp = NULL;
+ }
+
+ if (err) {
+ dmu_tx_abort(tx);
+ if (attrzp)
+ zrele(attrzp);
+ if (err == ERESTART)
+ goto top;
+ } else {
+ if (count > 0)
+ err2 = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
+ dmu_tx_commit(tx);
+ if (attrzp) {
+ if (err2 == 0 && handle_eadir)
+ err2 = zfs_setattr_dir(attrzp);
+ zrele(attrzp);
+ }
+ zfs_inode_update(zp);
+ }
+
+out2:
+ if (os->os_sync == ZFS_SYNC_ALWAYS)
+ zil_commit(zilog, 0);
+
+out3:
+ kmem_free(xattr_bulk, sizeof (sa_bulk_attr_t) * bulks);
+ kmem_free(bulk, sizeof (sa_bulk_attr_t) * bulks);
+ kmem_free(tmpxvattr, sizeof (xvattr_t));
+ ZFS_EXIT(zfsvfs);
+ return (err);
+}
+
+typedef struct zfs_zlock {
+ krwlock_t *zl_rwlock; /* lock we acquired */
+ znode_t *zl_znode; /* znode we held */
+ struct zfs_zlock *zl_next; /* next in list */
+} zfs_zlock_t;
+
+/*
+ * Drop locks and release vnodes that were held by zfs_rename_lock().
+ */
+static void
+zfs_rename_unlock(zfs_zlock_t **zlpp)
+{
+ zfs_zlock_t *zl;
+
+ while ((zl = *zlpp) != NULL) {
+ if (zl->zl_znode != NULL)
+ zfs_zrele_async(zl->zl_znode);
+ rw_exit(zl->zl_rwlock);
+ *zlpp = zl->zl_next;
+ kmem_free(zl, sizeof (*zl));
+ }
+}
+
+/*
+ * Search back through the directory tree, using the ".." entries.
+ * Lock each directory in the chain to prevent concurrent renames.
+ * Fail any attempt to move a directory into one of its own descendants.
+ * XXX - z_parent_lock can overlap with map or grow locks
+ */
+static int
+zfs_rename_lock(znode_t *szp, znode_t *tdzp, znode_t *sdzp, zfs_zlock_t **zlpp)
+{
+ zfs_zlock_t *zl;
+ znode_t *zp = tdzp;
+ uint64_t rootid = ZTOZSB(zp)->z_root;
+ uint64_t oidp = zp->z_id;
+ krwlock_t *rwlp = &szp->z_parent_lock;
+ krw_t rw = RW_WRITER;
+
+ /*
+ * First pass write-locks szp and compares to zp->z_id.
+ * Later passes read-lock zp and compare to zp->z_parent.
+ */
+ do {
+ if (!rw_tryenter(rwlp, rw)) {
+ /*
+ * Another thread is renaming in this path.
+ * Note that if we are a WRITER, we don't have any
+ * parent_locks held yet.
+ */
+ if (rw == RW_READER && zp->z_id > szp->z_id) {
+ /*
+ * Drop our locks and restart
+ */
+ zfs_rename_unlock(&zl);
+ *zlpp = NULL;
+ zp = tdzp;
+ oidp = zp->z_id;
+ rwlp = &szp->z_parent_lock;
+ rw = RW_WRITER;
+ continue;
+ } else {
+ /*
+ * Wait for other thread to drop its locks
+ */
+ rw_enter(rwlp, rw);
+ }
+ }
+
+ zl = kmem_alloc(sizeof (*zl), KM_SLEEP);
+ zl->zl_rwlock = rwlp;
+ zl->zl_znode = NULL;
+ zl->zl_next = *zlpp;
+ *zlpp = zl;
+
+ if (oidp == szp->z_id) /* We're a descendant of szp */
+ return (SET_ERROR(EINVAL));
+
+ if (oidp == rootid) /* We've hit the top */
+ return (0);
+
+ if (rw == RW_READER) { /* i.e. not the first pass */
+ int error = zfs_zget(ZTOZSB(zp), oidp, &zp);
+ if (error)
+ return (error);
+ zl->zl_znode = zp;
+ }
+ (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(ZTOZSB(zp)),
+ &oidp, sizeof (oidp));
+ rwlp = &zp->z_parent_lock;
+ rw = RW_READER;
+
+ } while (zp->z_id != sdzp->z_id);
+
+ return (0);
+}
+
+/*
+ * Move an entry from the provided source directory to the target
+ * directory. Change the entry name as indicated.
+ *
+ * IN: sdzp - Source directory containing the "old entry".
+ * snm - Old entry name.
+ * tdzp - Target directory to contain the "new entry".
+ * tnm - New entry name.
+ * cr - credentials of caller.
+ * flags - case flags
+ *
+ * RETURN: 0 on success, error code on failure.
+ *
+ * Timestamps:
+ * sdzp,tdzp - ctime|mtime updated
+ */
+/*ARGSUSED*/
+int
+zfs_rename(znode_t *sdzp, char *snm, znode_t *tdzp, char *tnm,
+ cred_t *cr, int flags)
+{
+ znode_t *szp, *tzp;
+ zfsvfs_t *zfsvfs = ZTOZSB(sdzp);
+ zilog_t *zilog;
+ zfs_dirlock_t *sdl, *tdl;
+ dmu_tx_t *tx;
+ zfs_zlock_t *zl;
+ int cmp, serr, terr;
+ int error = 0;
+ int zflg = 0;
+ boolean_t waited = B_FALSE;
+
+ if (snm == NULL || tnm == NULL)
+ return (SET_ERROR(EINVAL));
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(sdzp);
+ zilog = zfsvfs->z_log;
+
+ ZFS_VERIFY_ZP(tdzp);
+
+ /*
+ * We check i_sb because snapshots and the ctldir must have different
+ * super blocks.
+ */
+ if (ZTOI(tdzp)->i_sb != ZTOI(sdzp)->i_sb ||
+ zfsctl_is_node(ZTOI(tdzp))) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EXDEV));
+ }
+
+ if (zfsvfs->z_utf8 && u8_validate(tnm,
+ strlen(tnm), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EILSEQ));
+ }
+
+ if (flags & FIGNORECASE)
+ zflg |= ZCILOOK;
+
+top:
+ szp = NULL;
+ tzp = NULL;
+ zl = NULL;
+
+ /*
+ * This is to prevent the creation of links into attribute space
+ * by renaming a linked file into/outof an attribute directory.
+ * See the comment in zfs_link() for why this is considered bad.
+ */
+ if ((tdzp->z_pflags & ZFS_XATTR) != (sdzp->z_pflags & ZFS_XATTR)) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EINVAL));
+ }
+
+ /*
+ * Lock source and target directory entries. To prevent deadlock,
+ * a lock ordering must be defined. We lock the directory with
+ * the smallest object id first, or if it's a tie, the one with
+ * the lexically first name.
+ */
+ if (sdzp->z_id < tdzp->z_id) {
+ cmp = -1;
+ } else if (sdzp->z_id > tdzp->z_id) {
+ cmp = 1;
+ } else {
+ /*
+ * First compare the two name arguments without
+ * considering any case folding.
+ */
+ int nofold = (zfsvfs->z_norm & ~U8_TEXTPREP_TOUPPER);
+
+ cmp = u8_strcmp(snm, tnm, 0, nofold, U8_UNICODE_LATEST, &error);
+ ASSERT(error == 0 || !zfsvfs->z_utf8);
+ if (cmp == 0) {
+ /*
+ * POSIX: "If the old argument and the new argument
+ * both refer to links to the same existing file,
+ * the rename() function shall return successfully
+ * and perform no other action."
+ */
+ ZFS_EXIT(zfsvfs);
+ return (0);
+ }
+ /*
+ * If the file system is case-folding, then we may
+ * have some more checking to do. A case-folding file
+ * system is either supporting mixed case sensitivity
+ * access or is completely case-insensitive. Note
+ * that the file system is always case preserving.
+ *
+ * In mixed sensitivity mode case sensitive behavior
+ * is the default. FIGNORECASE must be used to
+ * explicitly request case insensitive behavior.
+ *
+ * If the source and target names provided differ only
+ * by case (e.g., a request to rename 'tim' to 'Tim'),
+ * we will treat this as a special case in the
+ * case-insensitive mode: as long as the source name
+ * is an exact match, we will allow this to proceed as
+ * a name-change request.
+ */
+ if ((zfsvfs->z_case == ZFS_CASE_INSENSITIVE ||
+ (zfsvfs->z_case == ZFS_CASE_MIXED &&
+ flags & FIGNORECASE)) &&
+ u8_strcmp(snm, tnm, 0, zfsvfs->z_norm, U8_UNICODE_LATEST,
+ &error) == 0) {
+ /*
+ * case preserving rename request, require exact
+ * name matches
+ */
+ zflg |= ZCIEXACT;
+ zflg &= ~ZCILOOK;
+ }
+ }
+
+ /*
+ * If the source and destination directories are the same, we should
+ * grab the z_name_lock of that directory only once.
+ */
+ if (sdzp == tdzp) {
+ zflg |= ZHAVELOCK;
+ rw_enter(&sdzp->z_name_lock, RW_READER);
+ }
+
+ if (cmp < 0) {
+ serr = zfs_dirent_lock(&sdl, sdzp, snm, &szp,
+ ZEXISTS | zflg, NULL, NULL);
+ terr = zfs_dirent_lock(&tdl,
+ tdzp, tnm, &tzp, ZRENAMING | zflg, NULL, NULL);
+ } else {
+ terr = zfs_dirent_lock(&tdl,
+ tdzp, tnm, &tzp, zflg, NULL, NULL);
+ serr = zfs_dirent_lock(&sdl,
+ sdzp, snm, &szp, ZEXISTS | ZRENAMING | zflg,
+ NULL, NULL);
+ }
+
+ if (serr) {
+ /*
+ * Source entry invalid or not there.
+ */
+ if (!terr) {
+ zfs_dirent_unlock(tdl);
+ if (tzp)
+ zrele(tzp);
+ }
+
+ if (sdzp == tdzp)
+ rw_exit(&sdzp->z_name_lock);
+
+ if (strcmp(snm, "..") == 0)
+ serr = EINVAL;
+ ZFS_EXIT(zfsvfs);
+ return (serr);
+ }
+ if (terr) {
+ zfs_dirent_unlock(sdl);
+ zrele(szp);
+
+ if (sdzp == tdzp)
+ rw_exit(&sdzp->z_name_lock);
+
+ if (strcmp(tnm, "..") == 0)
+ terr = EINVAL;
+ ZFS_EXIT(zfsvfs);
+ return (terr);
+ }
+
+ /*
+ * If we are using project inheritance, means if the directory has
+ * ZFS_PROJINHERIT set, then its descendant directories will inherit
+ * not only the project ID, but also the ZFS_PROJINHERIT flag. Under
+ * such case, we only allow renames into our tree when the project
+ * IDs are the same.
+ */
+ if (tdzp->z_pflags & ZFS_PROJINHERIT &&
+ tdzp->z_projid != szp->z_projid) {
+ error = SET_ERROR(EXDEV);
+ goto out;
+ }
+
+ /*
+ * Must have write access at the source to remove the old entry
+ * and write access at the target to create the new entry.
+ * Note that if target and source are the same, this can be
+ * done in a single check.
+ */
+
+ if ((error = zfs_zaccess_rename(sdzp, szp, tdzp, tzp, cr)))
+ goto out;
+
+ if (S_ISDIR(ZTOI(szp)->i_mode)) {
+ /*
+ * Check to make sure rename is valid.
+ * Can't do a move like this: /usr/a/b to /usr/a/b/c/d
+ */
+ if ((error = zfs_rename_lock(szp, tdzp, sdzp, &zl)))
+ goto out;
+ }
+
+ /*
+ * Does target exist?
+ */
+ if (tzp) {
+ /*
+ * Source and target must be the same type.
+ */
+ if (S_ISDIR(ZTOI(szp)->i_mode)) {
+ if (!S_ISDIR(ZTOI(tzp)->i_mode)) {
+ error = SET_ERROR(ENOTDIR);
+ goto out;
+ }
+ } else {
+ if (S_ISDIR(ZTOI(tzp)->i_mode)) {
+ error = SET_ERROR(EISDIR);
+ goto out;
+ }
+ }
+ /*
+ * POSIX dictates that when the source and target
+ * entries refer to the same file object, rename
+ * must do nothing and exit without error.
+ */
+ if (szp->z_id == tzp->z_id) {
+ error = 0;
+ goto out;
+ }
+ }
+
+ tx = dmu_tx_create(zfsvfs->z_os);
+ dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE);
+ dmu_tx_hold_sa(tx, sdzp->z_sa_hdl, B_FALSE);
+ dmu_tx_hold_zap(tx, sdzp->z_id, FALSE, snm);
+ dmu_tx_hold_zap(tx, tdzp->z_id, TRUE, tnm);
+ if (sdzp != tdzp) {
+ dmu_tx_hold_sa(tx, tdzp->z_sa_hdl, B_FALSE);
+ zfs_sa_upgrade_txholds(tx, tdzp);
+ }
+ if (tzp) {
+ dmu_tx_hold_sa(tx, tzp->z_sa_hdl, B_FALSE);
+ zfs_sa_upgrade_txholds(tx, tzp);
+ }
+
+ zfs_sa_upgrade_txholds(tx, szp);
+ dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
+ error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
+ if (error) {
+ if (zl != NULL)
+ zfs_rename_unlock(&zl);
+ zfs_dirent_unlock(sdl);
+ zfs_dirent_unlock(tdl);
+
+ if (sdzp == tdzp)
+ rw_exit(&sdzp->z_name_lock);
+
+ if (error == ERESTART) {
+ waited = B_TRUE;
+ dmu_tx_wait(tx);
+ dmu_tx_abort(tx);
+ zrele(szp);
+ if (tzp)
+ zrele(tzp);
+ goto top;
+ }
+ dmu_tx_abort(tx);
+ zrele(szp);
+ if (tzp)
+ zrele(tzp);
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ if (tzp) /* Attempt to remove the existing target */
+ error = zfs_link_destroy(tdl, tzp, tx, zflg, NULL);
+
+ if (error == 0) {
+ error = zfs_link_create(tdl, szp, tx, ZRENAMING);
+ if (error == 0) {
+ szp->z_pflags |= ZFS_AV_MODIFIED;
+ if (tdzp->z_pflags & ZFS_PROJINHERIT)
+ szp->z_pflags |= ZFS_PROJINHERIT;
+
+ error = sa_update(szp->z_sa_hdl, SA_ZPL_FLAGS(zfsvfs),
+ (void *)&szp->z_pflags, sizeof (uint64_t), tx);
+ ASSERT0(error);
+
+ error = zfs_link_destroy(sdl, szp, tx, ZRENAMING, NULL);
+ if (error == 0) {
+ zfs_log_rename(zilog, tx, TX_RENAME |
+ (flags & FIGNORECASE ? TX_CI : 0), sdzp,
+ sdl->dl_name, tdzp, tdl->dl_name, szp);
+ } else {
+ /*
+ * At this point, we have successfully created
+ * the target name, but have failed to remove
+ * the source name. Since the create was done
+ * with the ZRENAMING flag, there are
+ * complications; for one, the link count is
+ * wrong. The easiest way to deal with this
+ * is to remove the newly created target, and
+ * return the original error. This must
+ * succeed; fortunately, it is very unlikely to
+ * fail, since we just created it.
+ */
+ VERIFY3U(zfs_link_destroy(tdl, szp, tx,
+ ZRENAMING, NULL), ==, 0);
+ }
+ } else {
+ /*
+ * If we had removed the existing target, subsequent
+ * call to zfs_link_create() to add back the same entry
+ * but, the new dnode (szp) should not fail.
+ */
+ ASSERT(tzp == NULL);
+ }
+ }
+
+ dmu_tx_commit(tx);
+out:
+ if (zl != NULL)
+ zfs_rename_unlock(&zl);
+
+ zfs_dirent_unlock(sdl);
+ zfs_dirent_unlock(tdl);
+
+ zfs_inode_update(sdzp);
+ if (sdzp == tdzp)
+ rw_exit(&sdzp->z_name_lock);
+
+ if (sdzp != tdzp)
+ zfs_inode_update(tdzp);
+
+ zfs_inode_update(szp);
+ zrele(szp);
+ if (tzp) {
+ zfs_inode_update(tzp);
+ zrele(tzp);
+ }
+
+ if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
+ zil_commit(zilog, 0);
+
+ ZFS_EXIT(zfsvfs);
+ return (error);
+}
+
+/*
+ * Insert the indicated symbolic reference entry into the directory.
+ *
+ * IN: dzp - Directory to contain new symbolic link.
+ * name - Name of directory entry in dip.
+ * vap - Attributes of new entry.
+ * link - Name for new symlink entry.
+ * cr - credentials of caller.
+ * flags - case flags
+ *
+ * OUT: zpp - Znode for new symbolic link.
+ *
+ * RETURN: 0 on success, error code on failure.
+ *
+ * Timestamps:
+ * dip - ctime|mtime updated
+ */
+/*ARGSUSED*/
+int
+zfs_symlink(znode_t *dzp, char *name, vattr_t *vap, char *link,
+ znode_t **zpp, cred_t *cr, int flags)
+{
+ znode_t *zp;
+ zfs_dirlock_t *dl;
+ dmu_tx_t *tx;
+ zfsvfs_t *zfsvfs = ZTOZSB(dzp);
+ zilog_t *zilog;
+ uint64_t len = strlen(link);
+ int error;
+ int zflg = ZNEW;
+ zfs_acl_ids_t acl_ids;
+ boolean_t fuid_dirtied;
+ uint64_t txtype = TX_SYMLINK;
+ boolean_t waited = B_FALSE;
+
+ ASSERT(S_ISLNK(vap->va_mode));
+
+ if (name == NULL)
+ return (SET_ERROR(EINVAL));
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(dzp);
+ zilog = zfsvfs->z_log;
+
+ if (zfsvfs->z_utf8 && u8_validate(name, strlen(name),
+ NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EILSEQ));
+ }
+ if (flags & FIGNORECASE)
+ zflg |= ZCILOOK;
+
+ if (len > MAXPATHLEN) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(ENAMETOOLONG));
+ }
+
+ if ((error = zfs_acl_ids_create(dzp, 0,
+ vap, cr, NULL, &acl_ids)) != 0) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+top:
+ *zpp = NULL;
+
+ /*
+ * Attempt to lock directory; fail if entry already exists.
+ */
+ error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg, NULL, NULL);
+ if (error) {
+ zfs_acl_ids_free(&acl_ids);
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ if ((error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
+ zfs_acl_ids_free(&acl_ids);
+ zfs_dirent_unlock(dl);
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ if (zfs_acl_ids_overquota(zfsvfs, &acl_ids, ZFS_DEFAULT_PROJID)) {
+ zfs_acl_ids_free(&acl_ids);
+ zfs_dirent_unlock(dl);
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EDQUOT));
+ }
+ tx = dmu_tx_create(zfsvfs->z_os);
+ fuid_dirtied = zfsvfs->z_fuid_dirty;
+ dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, MAX(1, len));
+ dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
+ dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
+ ZFS_SA_BASE_ATTR_SIZE + len);
+ dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE);
+ if (!zfsvfs->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
+ dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
+ acl_ids.z_aclp->z_acl_bytes);
+ }
+ if (fuid_dirtied)
+ zfs_fuid_txhold(zfsvfs, tx);
+ error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
+ if (error) {
+ zfs_dirent_unlock(dl);
+ if (error == ERESTART) {
+ waited = B_TRUE;
+ dmu_tx_wait(tx);
+ dmu_tx_abort(tx);
+ goto top;
+ }
+ zfs_acl_ids_free(&acl_ids);
+ dmu_tx_abort(tx);
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ /*
+ * Create a new object for the symlink.
+ * for version 4 ZPL datsets the symlink will be an SA attribute
+ */
+ zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);
+
+ if (fuid_dirtied)
+ zfs_fuid_sync(zfsvfs, tx);
+
+ mutex_enter(&zp->z_lock);
+ if (zp->z_is_sa)
+ error = sa_update(zp->z_sa_hdl, SA_ZPL_SYMLINK(zfsvfs),
+ link, len, tx);
+ else
+ zfs_sa_symlink(zp, link, len, tx);
+ mutex_exit(&zp->z_lock);
+
+ zp->z_size = len;
+ (void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zfsvfs),
+ &zp->z_size, sizeof (zp->z_size), tx);
+ /*
+ * Insert the new object into the directory.
+ */
+ error = zfs_link_create(dl, zp, tx, ZNEW);
+ if (error != 0) {
+ zfs_znode_delete(zp, tx);
+ remove_inode_hash(ZTOI(zp));
+ } else {
+ if (flags & FIGNORECASE)
+ txtype |= TX_CI;
+ zfs_log_symlink(zilog, tx, txtype, dzp, zp, name, link);
+
+ zfs_inode_update(dzp);
+ zfs_inode_update(zp);
+ }
+
+ zfs_acl_ids_free(&acl_ids);
+
+ dmu_tx_commit(tx);
+
+ zfs_dirent_unlock(dl);
+
+ if (error == 0) {
+ *zpp = zp;
+
+ if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
+ zil_commit(zilog, 0);
+ } else {
+ zrele(zp);
+ }
+
+ ZFS_EXIT(zfsvfs);
+ return (error);
+}
+
+/*
+ * Return, in the buffer contained in the provided uio structure,
+ * the symbolic path referred to by ip.
+ *
+ * IN: ip - inode of symbolic link
+ * uio - structure to contain the link path.
+ * cr - credentials of caller.
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * Timestamps:
+ * ip - atime updated
+ */
+/* ARGSUSED */
+int
+zfs_readlink(struct inode *ip, uio_t *uio, cred_t *cr)
+{
+ znode_t *zp = ITOZ(ip);
+ zfsvfs_t *zfsvfs = ITOZSB(ip);
+ int error;
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ mutex_enter(&zp->z_lock);
+ if (zp->z_is_sa)
+ error = sa_lookup_uio(zp->z_sa_hdl,
+ SA_ZPL_SYMLINK(zfsvfs), uio);
+ else
+ error = zfs_sa_readlink(zp, uio);
+ mutex_exit(&zp->z_lock);
+
+ ZFS_EXIT(zfsvfs);
+ return (error);
+}
+
+/*
+ * Insert a new entry into directory tdzp referencing szp.
+ *
+ * IN: tdzp - Directory to contain new entry.
+ * szp - znode of new entry.
+ * name - name of new entry.
+ * cr - credentials of caller.
+ * flags - case flags.
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * Timestamps:
+ * tdzp - ctime|mtime updated
+ * szp - ctime updated
+ */
+/* ARGSUSED */
+int
+zfs_link(znode_t *tdzp, znode_t *szp, char *name, cred_t *cr,
+ int flags)
+{
+ struct inode *sip = ZTOI(szp);
+ znode_t *tzp;
+ zfsvfs_t *zfsvfs = ZTOZSB(tdzp);
+ zilog_t *zilog;
+ zfs_dirlock_t *dl;
+ dmu_tx_t *tx;
+ int error;
+ int zf = ZNEW;
+ uint64_t parent;
+ uid_t owner;
+ boolean_t waited = B_FALSE;
+ boolean_t is_tmpfile = 0;
+ uint64_t txg;
+#ifdef HAVE_TMPFILE
+ is_tmpfile = (sip->i_nlink == 0 && (sip->i_state & I_LINKABLE));
+#endif
+ ASSERT(S_ISDIR(ZTOI(tdzp)->i_mode));
+
+ if (name == NULL)
+ return (SET_ERROR(EINVAL));
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(tdzp);
+ zilog = zfsvfs->z_log;
+
+ /*
+ * POSIX dictates that we return EPERM here.
+ * Better choices include ENOTSUP or EISDIR.
+ */
+ if (S_ISDIR(sip->i_mode)) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EPERM));
+ }
+
+ ZFS_VERIFY_ZP(szp);
+
+ /*
+ * If we are using project inheritance, means if the directory has
+ * ZFS_PROJINHERIT set, then its descendant directories will inherit
+ * not only the project ID, but also the ZFS_PROJINHERIT flag. Under
+ * such case, we only allow hard link creation in our tree when the
+ * project IDs are the same.
+ */
+ if (tdzp->z_pflags & ZFS_PROJINHERIT &&
+ tdzp->z_projid != szp->z_projid) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EXDEV));
+ }
+
+ /*
+ * We check i_sb because snapshots and the ctldir must have different
+ * super blocks.
+ */
+ if (sip->i_sb != ZTOI(tdzp)->i_sb || zfsctl_is_node(sip)) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EXDEV));
+ }
+
+ /* Prevent links to .zfs/shares files */
+
+ if ((error = sa_lookup(szp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs),
+ &parent, sizeof (uint64_t))) != 0) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+ if (parent == zfsvfs->z_shares_dir) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EPERM));
+ }
+
+ if (zfsvfs->z_utf8 && u8_validate(name,
+ strlen(name), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EILSEQ));
+ }
+ if (flags & FIGNORECASE)
+ zf |= ZCILOOK;
+
+ /*
+ * We do not support links between attributes and non-attributes
+ * because of the potential security risk of creating links
+ * into "normal" file space in order to circumvent restrictions
+ * imposed in attribute space.
+ */
+ if ((szp->z_pflags & ZFS_XATTR) != (tdzp->z_pflags & ZFS_XATTR)) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EINVAL));
+ }
+
+ owner = zfs_fuid_map_id(zfsvfs, KUID_TO_SUID(sip->i_uid),
+ cr, ZFS_OWNER);
+ if (owner != crgetuid(cr) && secpolicy_basic_link(cr) != 0) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EPERM));
+ }
+
+ if ((error = zfs_zaccess(tdzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+top:
+ /*
+ * Attempt to lock directory; fail if entry already exists.
+ */
+ error = zfs_dirent_lock(&dl, tdzp, name, &tzp, zf, NULL, NULL);
+ if (error) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ tx = dmu_tx_create(zfsvfs->z_os);
+ dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE);
+ dmu_tx_hold_zap(tx, tdzp->z_id, TRUE, name);
+ if (is_tmpfile)
+ dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
+
+ zfs_sa_upgrade_txholds(tx, szp);
+ zfs_sa_upgrade_txholds(tx, tdzp);
+ error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
+ if (error) {
+ zfs_dirent_unlock(dl);
+ if (error == ERESTART) {
+ waited = B_TRUE;
+ dmu_tx_wait(tx);
+ dmu_tx_abort(tx);
+ goto top;
+ }
+ dmu_tx_abort(tx);
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+ /* unmark z_unlinked so zfs_link_create will not reject */
+ if (is_tmpfile)
+ szp->z_unlinked = B_FALSE;
+ error = zfs_link_create(dl, szp, tx, 0);
+
+ if (error == 0) {
+ uint64_t txtype = TX_LINK;
+ /*
+ * tmpfile is created to be in z_unlinkedobj, so remove it.
+ * Also, we don't log in ZIL, because all previous file
+ * operation on the tmpfile are ignored by ZIL. Instead we
+ * always wait for txg to sync to make sure all previous
+ * operation are sync safe.
+ */
+ if (is_tmpfile) {
+ VERIFY(zap_remove_int(zfsvfs->z_os,
+ zfsvfs->z_unlinkedobj, szp->z_id, tx) == 0);
+ } else {
+ if (flags & FIGNORECASE)
+ txtype |= TX_CI;
+ zfs_log_link(zilog, tx, txtype, tdzp, szp, name);
+ }
+ } else if (is_tmpfile) {
+ /* restore z_unlinked since when linking failed */
+ szp->z_unlinked = B_TRUE;
+ }
+ txg = dmu_tx_get_txg(tx);
+ dmu_tx_commit(tx);
+
+ zfs_dirent_unlock(dl);
+
+ if (!is_tmpfile && zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
+ zil_commit(zilog, 0);
+
+ if (is_tmpfile && zfsvfs->z_os->os_sync != ZFS_SYNC_DISABLED)
+ txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), txg);
+
+ zfs_inode_update(tdzp);
+ zfs_inode_update(szp);
+ ZFS_EXIT(zfsvfs);
+ return (error);
+}
+
+static void
+zfs_putpage_commit_cb(void *arg)
+{
+ struct page *pp = arg;
+
+ ClearPageError(pp);
+ end_page_writeback(pp);
+}
+
+/*
+ * Push a page out to disk, once the page is on stable storage the
+ * registered commit callback will be run as notification of completion.
+ *
+ * IN: ip - page mapped for inode.
+ * pp - page to push (page is locked)
+ * wbc - writeback control data
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * Timestamps:
+ * ip - ctime|mtime updated
+ */
+/* ARGSUSED */
+int
+zfs_putpage(struct inode *ip, struct page *pp, struct writeback_control *wbc)
+{
+ znode_t *zp = ITOZ(ip);
+ zfsvfs_t *zfsvfs = ITOZSB(ip);
+ loff_t offset;
+ loff_t pgoff;
+ unsigned int pglen;
+ dmu_tx_t *tx;
+ caddr_t va;
+ int err = 0;
+ uint64_t mtime[2], ctime[2];
+ sa_bulk_attr_t bulk[3];
+ int cnt = 0;
+ struct address_space *mapping;
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ ASSERT(PageLocked(pp));
+
+ pgoff = page_offset(pp); /* Page byte-offset in file */
+ offset = i_size_read(ip); /* File length in bytes */
+ pglen = MIN(PAGE_SIZE, /* Page length in bytes */
+ P2ROUNDUP(offset, PAGE_SIZE)-pgoff);
+
+ /* Page is beyond end of file */
+ if (pgoff >= offset) {
+ unlock_page(pp);
+ ZFS_EXIT(zfsvfs);
+ return (0);
+ }
+
+ /* Truncate page length to end of file */
+ if (pgoff + pglen > offset)
+ pglen = offset - pgoff;
+
+#if 0
+ /*
+ * FIXME: Allow mmap writes past its quota. The correct fix
+ * is to register a page_mkwrite() handler to count the page
+ * against its quota when it is about to be dirtied.
+ */
+ if (zfs_id_overblockquota(zfsvfs, DMU_USERUSED_OBJECT,
+ KUID_TO_SUID(ip->i_uid)) ||
+ zfs_id_overblockquota(zfsvfs, DMU_GROUPUSED_OBJECT,
+ KGID_TO_SGID(ip->i_gid)) ||
+ (zp->z_projid != ZFS_DEFAULT_PROJID &&
+ zfs_id_overblockquota(zfsvfs, DMU_PROJECTUSED_OBJECT,
+ zp->z_projid))) {
+ err = EDQUOT;
+ }
+#endif
+
+ /*
+ * The ordering here is critical and must adhere to the following
+ * rules in order to avoid deadlocking in either zfs_read() or
+ * zfs_free_range() due to a lock inversion.
+ *
+ * 1) The page must be unlocked prior to acquiring the range lock.
+ * This is critical because zfs_read() calls find_lock_page()
+ * which may block on the page lock while holding the range lock.
+ *
+ * 2) Before setting or clearing write back on a page the range lock
+ * must be held in order to prevent a lock inversion with the
+ * zfs_free_range() function.
+ *
+ * This presents a problem because upon entering this function the
+ * page lock is already held. To safely acquire the range lock the
+ * page lock must be dropped. This creates a window where another
+ * process could truncate, invalidate, dirty, or write out the page.
+ *
+ * Therefore, after successfully reacquiring the range and page locks
+ * the current page state is checked. In the common case everything
+ * will be as is expected and it can be written out. However, if
+ * the page state has changed it must be handled accordingly.
+ */
+ mapping = pp->mapping;
+ redirty_page_for_writepage(wbc, pp);
+ unlock_page(pp);
+
+ zfs_locked_range_t *lr = zfs_rangelock_enter(&zp->z_rangelock,
+ pgoff, pglen, RL_WRITER);
+ lock_page(pp);
+
+ /* Page mapping changed or it was no longer dirty, we're done */
+ if (unlikely((mapping != pp->mapping) || !PageDirty(pp))) {
+ unlock_page(pp);
+ zfs_rangelock_exit(lr);
+ ZFS_EXIT(zfsvfs);
+ return (0);
+ }
+
+ /* Another process started write block if required */
+ if (PageWriteback(pp)) {
+ unlock_page(pp);
+ zfs_rangelock_exit(lr);
+
+ if (wbc->sync_mode != WB_SYNC_NONE) {
+ if (PageWriteback(pp))
+ wait_on_page_bit(pp, PG_writeback);
+ }
+
+ ZFS_EXIT(zfsvfs);
+ return (0);
+ }
+
+ /* Clear the dirty flag the required locks are held */
+ if (!clear_page_dirty_for_io(pp)) {
+ unlock_page(pp);
+ zfs_rangelock_exit(lr);
+ ZFS_EXIT(zfsvfs);
+ return (0);
+ }
+
+ /*
+ * Counterpart for redirty_page_for_writepage() above. This page
+ * was in fact not skipped and should not be counted as if it were.
+ */
+ wbc->pages_skipped--;
+ set_page_writeback(pp);
+ unlock_page(pp);
+
+ tx = dmu_tx_create(zfsvfs->z_os);
+ dmu_tx_hold_write(tx, zp->z_id, pgoff, pglen);
+ dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
+ zfs_sa_upgrade_txholds(tx, zp);
+
+ err = dmu_tx_assign(tx, TXG_NOWAIT);
+ if (err != 0) {
+ if (err == ERESTART)
+ dmu_tx_wait(tx);
+
+ dmu_tx_abort(tx);
+ __set_page_dirty_nobuffers(pp);
+ ClearPageError(pp);
+ end_page_writeback(pp);
+ zfs_rangelock_exit(lr);
+ ZFS_EXIT(zfsvfs);
+ return (err);
+ }
+
+ va = kmap(pp);
+ ASSERT3U(pglen, <=, PAGE_SIZE);
+ dmu_write(zfsvfs->z_os, zp->z_id, pgoff, pglen, va, tx);
+ kunmap(pp);
+
+ SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
+ SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
+ SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_FLAGS(zfsvfs), NULL,
+ &zp->z_pflags, 8);
+
+ /* Preserve the mtime and ctime provided by the inode */
+ ZFS_TIME_ENCODE(&ip->i_mtime, mtime);
+ ZFS_TIME_ENCODE(&ip->i_ctime, ctime);
+ zp->z_atime_dirty = B_FALSE;
+ zp->z_seq++;
+
+ err = sa_bulk_update(zp->z_sa_hdl, bulk, cnt, tx);
+
+ zfs_log_write(zfsvfs->z_log, tx, TX_WRITE, zp, pgoff, pglen, 0,
+ zfs_putpage_commit_cb, pp);
+ dmu_tx_commit(tx);
+
+ zfs_rangelock_exit(lr);
+
+ if (wbc->sync_mode != WB_SYNC_NONE) {
+ /*
+ * Note that this is rarely called under writepages(), because
+ * writepages() normally handles the entire commit for
+ * performance reasons.
+ */
+ zil_commit(zfsvfs->z_log, zp->z_id);
+ }
+
+ ZFS_EXIT(zfsvfs);
+ return (err);
+}
+
+/*
+ * Update the system attributes when the inode has been dirtied. For the
+ * moment we only update the mode, atime, mtime, and ctime.
+ */
+int
+zfs_dirty_inode(struct inode *ip, int flags)
+{
+ znode_t *zp = ITOZ(ip);
+ zfsvfs_t *zfsvfs = ITOZSB(ip);
+ dmu_tx_t *tx;
+ uint64_t mode, atime[2], mtime[2], ctime[2];
+ sa_bulk_attr_t bulk[4];
+ int error = 0;
+ int cnt = 0;
+
+ if (zfs_is_readonly(zfsvfs) || dmu_objset_is_snapshot(zfsvfs->z_os))
+ return (0);
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+#ifdef I_DIRTY_TIME
+ /*
+ * This is the lazytime semantic introduced in Linux 4.0
+ * This flag will only be called from update_time when lazytime is set.
+ * (Note, I_DIRTY_SYNC will also set if not lazytime)
+ * Fortunately mtime and ctime are managed within ZFS itself, so we
+ * only need to dirty atime.
+ */
+ if (flags == I_DIRTY_TIME) {
+ zp->z_atime_dirty = B_TRUE;
+ goto out;
+ }
+#endif
+
+ tx = dmu_tx_create(zfsvfs->z_os);
+
+ dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
+ zfs_sa_upgrade_txholds(tx, zp);
+
+ error = dmu_tx_assign(tx, TXG_WAIT);
+ if (error) {
+ dmu_tx_abort(tx);
+ goto out;
+ }
+
+ mutex_enter(&zp->z_lock);
+ zp->z_atime_dirty = B_FALSE;
+
+ SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8);
+ SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_ATIME(zfsvfs), NULL, &atime, 16);
+ SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
+ SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
+
+ /* Preserve the mode, mtime and ctime provided by the inode */
+ ZFS_TIME_ENCODE(&ip->i_atime, atime);
+ ZFS_TIME_ENCODE(&ip->i_mtime, mtime);
+ ZFS_TIME_ENCODE(&ip->i_ctime, ctime);
+ mode = ip->i_mode;
+
+ zp->z_mode = mode;
+
+ error = sa_bulk_update(zp->z_sa_hdl, bulk, cnt, tx);
+ mutex_exit(&zp->z_lock);
+
+ dmu_tx_commit(tx);
+out:
+ ZFS_EXIT(zfsvfs);
+ return (error);
+}
+
+/*ARGSUSED*/
+void
+zfs_inactive(struct inode *ip)
+{
+ znode_t *zp = ITOZ(ip);
+ zfsvfs_t *zfsvfs = ITOZSB(ip);
+ uint64_t atime[2];
+ int error;
+ int need_unlock = 0;
+
+ /* Only read lock if we haven't already write locked, e.g. rollback */
+ if (!RW_WRITE_HELD(&zfsvfs->z_teardown_inactive_lock)) {
+ need_unlock = 1;
+ rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_READER);
+ }
+ if (zp->z_sa_hdl == NULL) {
+ if (need_unlock)
+ rw_exit(&zfsvfs->z_teardown_inactive_lock);
+ return;
+ }
+
+ if (zp->z_atime_dirty && zp->z_unlinked == B_FALSE) {
+ dmu_tx_t *tx = dmu_tx_create(zfsvfs->z_os);
+
+ dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
+ zfs_sa_upgrade_txholds(tx, zp);
+ error = dmu_tx_assign(tx, TXG_WAIT);
+ if (error) {
+ dmu_tx_abort(tx);
+ } else {
+ ZFS_TIME_ENCODE(&ip->i_atime, atime);
+ mutex_enter(&zp->z_lock);
+ (void) sa_update(zp->z_sa_hdl, SA_ZPL_ATIME(zfsvfs),
+ (void *)&atime, sizeof (atime), tx);
+ zp->z_atime_dirty = B_FALSE;
+ mutex_exit(&zp->z_lock);
+ dmu_tx_commit(tx);
+ }
+ }
+
+ zfs_zinactive(zp);
+ if (need_unlock)
+ rw_exit(&zfsvfs->z_teardown_inactive_lock);
+}
+
+/*
+ * Fill pages with data from the disk.
+ */
+static int
+zfs_fillpage(struct inode *ip, struct page *pl[], int nr_pages)
+{
+ znode_t *zp = ITOZ(ip);
+ zfsvfs_t *zfsvfs = ITOZSB(ip);
+ objset_t *os;
+ struct page *cur_pp;
+ u_offset_t io_off, total;
+ size_t io_len;
+ loff_t i_size;
+ unsigned page_idx;
+ int err;
+
+ os = zfsvfs->z_os;
+ io_len = nr_pages << PAGE_SHIFT;
+ i_size = i_size_read(ip);
+ io_off = page_offset(pl[0]);
+
+ if (io_off + io_len > i_size)
+ io_len = i_size - io_off;
+
+ /*
+ * Iterate over list of pages and read each page individually.
+ */
+ page_idx = 0;
+ for (total = io_off + io_len; io_off < total; io_off += PAGESIZE) {
+ caddr_t va;
+
+ cur_pp = pl[page_idx++];
+ va = kmap(cur_pp);
+ err = dmu_read(os, zp->z_id, io_off, PAGESIZE, va,
+ DMU_READ_PREFETCH);
+ kunmap(cur_pp);
+ if (err) {
+ /* convert checksum errors into IO errors */
+ if (err == ECKSUM)
+ err = SET_ERROR(EIO);
+ return (err);
+ }
+ }
+
+ return (0);
+}
+
+/*
+ * Uses zfs_fillpage to read data from the file and fill the pages.
+ *
+ * IN: ip - inode of file to get data from.
+ * pl - list of pages to read
+ * nr_pages - number of pages to read
+ *
+ * RETURN: 0 on success, error code on failure.
+ *
+ * Timestamps:
+ * vp - atime updated
+ */
+/* ARGSUSED */
+int
+zfs_getpage(struct inode *ip, struct page *pl[], int nr_pages)
+{
+ znode_t *zp = ITOZ(ip);
+ zfsvfs_t *zfsvfs = ITOZSB(ip);
+ int err;
+
+ if (pl == NULL)
+ return (0);
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ err = zfs_fillpage(ip, pl, nr_pages);
+
+ ZFS_EXIT(zfsvfs);
+ return (err);
+}
+
+/*
+ * Check ZFS specific permissions to memory map a section of a file.
+ *
+ * IN: ip - inode of the file to mmap
+ * off - file offset
+ * addrp - start address in memory region
+ * len - length of memory region
+ * vm_flags- address flags
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ */
+/*ARGSUSED*/
+int
+zfs_map(struct inode *ip, offset_t off, caddr_t *addrp, size_t len,
+ unsigned long vm_flags)
+{
+ znode_t *zp = ITOZ(ip);
+ zfsvfs_t *zfsvfs = ITOZSB(ip);
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ if ((vm_flags & VM_WRITE) && (zp->z_pflags &
+ (ZFS_IMMUTABLE | ZFS_READONLY | ZFS_APPENDONLY))) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EPERM));
+ }
+
+ if ((vm_flags & (VM_READ | VM_EXEC)) &&
+ (zp->z_pflags & ZFS_AV_QUARANTINED)) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EACCES));
+ }
+
+ if (off < 0 || len > MAXOFFSET_T - off) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(ENXIO));
+ }
+
+ ZFS_EXIT(zfsvfs);
+ return (0);
+}
+
+/*
+ * Free or allocate space in a file. Currently, this function only
+ * supports the `F_FREESP' command. However, this command is somewhat
+ * misnamed, as its functionality includes the ability to allocate as
+ * well as free space.
+ *
+ * IN: zp - znode of file to free data in.
+ * cmd - action to take (only F_FREESP supported).
+ * bfp - section of file to free/alloc.
+ * flag - current file open mode flags.
+ * offset - current file offset.
+ * cr - credentials of caller.
+ *
+ * RETURN: 0 on success, error code on failure.
+ *
+ * Timestamps:
+ * zp - ctime|mtime updated
+ */
+/* ARGSUSED */
+int
+zfs_space(znode_t *zp, int cmd, flock64_t *bfp, int flag,
+ offset_t offset, cred_t *cr)
+{
+ zfsvfs_t *zfsvfs = ZTOZSB(zp);
+ uint64_t off, len;
+ int error;
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ if (cmd != F_FREESP) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EINVAL));
+ }
+
+ /*
+ * Callers might not be able to detect properly that we are read-only,
+ * so check it explicitly here.
+ */
+ if (zfs_is_readonly(zfsvfs)) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EROFS));
+ }
+
+ if (bfp->l_len < 0) {
+ ZFS_EXIT(zfsvfs);
+ return (SET_ERROR(EINVAL));
+ }
+
+ /*
+ * Permissions aren't checked on Solaris because on this OS
+ * zfs_space() can only be called with an opened file handle.
+ * On Linux we can get here through truncate_range() which
+ * operates directly on inodes, so we need to check access rights.
+ */
+ if ((error = zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr))) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ off = bfp->l_start;
+ len = bfp->l_len; /* 0 means from off to end of file */
+
+ error = zfs_freesp(zp, off, len, flag, TRUE);
+
+ ZFS_EXIT(zfsvfs);
+ return (error);
+}
+
+/*ARGSUSED*/
+int
+zfs_fid(struct inode *ip, fid_t *fidp)
+{
+ znode_t *zp = ITOZ(ip);
+ zfsvfs_t *zfsvfs = ITOZSB(ip);
+ uint32_t gen;
+ uint64_t gen64;
+ uint64_t object = zp->z_id;
+ zfid_short_t *zfid;
+ int size, i, error;
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs),
+ &gen64, sizeof (uint64_t))) != 0) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ gen = (uint32_t)gen64;
+
+ size = SHORT_FID_LEN;
+
+ zfid = (zfid_short_t *)fidp;
+
+ zfid->zf_len = size;
+
+ for (i = 0; i < sizeof (zfid->zf_object); i++)
+ zfid->zf_object[i] = (uint8_t)(object >> (8 * i));
+
+ /* Must have a non-zero generation number to distinguish from .zfs */
+ if (gen == 0)
+ gen = 1;
+ for (i = 0; i < sizeof (zfid->zf_gen); i++)
+ zfid->zf_gen[i] = (uint8_t)(gen >> (8 * i));
+
+ ZFS_EXIT(zfsvfs);
+ return (0);
+}
+
+#if defined(_KERNEL)
+EXPORT_SYMBOL(zfs_open);
+EXPORT_SYMBOL(zfs_close);
+EXPORT_SYMBOL(zfs_lookup);
+EXPORT_SYMBOL(zfs_create);
+EXPORT_SYMBOL(zfs_tmpfile);
+EXPORT_SYMBOL(zfs_remove);
+EXPORT_SYMBOL(zfs_mkdir);
+EXPORT_SYMBOL(zfs_rmdir);
+EXPORT_SYMBOL(zfs_readdir);
+EXPORT_SYMBOL(zfs_getattr_fast);
+EXPORT_SYMBOL(zfs_setattr);
+EXPORT_SYMBOL(zfs_rename);
+EXPORT_SYMBOL(zfs_symlink);
+EXPORT_SYMBOL(zfs_readlink);
+EXPORT_SYMBOL(zfs_link);
+EXPORT_SYMBOL(zfs_inactive);
+EXPORT_SYMBOL(zfs_space);
+EXPORT_SYMBOL(zfs_fid);
+EXPORT_SYMBOL(zfs_getpage);
+EXPORT_SYMBOL(zfs_putpage);
+EXPORT_SYMBOL(zfs_dirty_inode);
+EXPORT_SYMBOL(zfs_map);
+
+/* BEGIN CSTYLED */
+module_param(zfs_delete_blocks, ulong, 0644);
+MODULE_PARM_DESC(zfs_delete_blocks, "Delete files larger than N blocks async");
+/* END CSTYLED */
+
+#endif