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-rw-r--r--uts/common/fs/zfs/zfs_vnops.c5243
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diff --git a/uts/common/fs/zfs/zfs_vnops.c b/uts/common/fs/zfs/zfs_vnops.c
new file mode 100644
index 000000000000..a0720079cf46
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+++ b/uts/common/fs/zfs/zfs_vnops.c
@@ -0,0 +1,5243 @@
+/*
+ * 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.
+ */
+
+/* Portions Copyright 2007 Jeremy Teo */
+/* Portions Copyright 2010 Robert Milkowski */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/time.h>
+#include <sys/systm.h>
+#include <sys/sysmacros.h>
+#include <sys/resource.h>
+#include <sys/vfs.h>
+#include <sys/vfs_opreg.h>
+#include <sys/vnode.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/vm.h>
+#include <vm/seg_vn.h>
+#include <vm/pvn.h>
+#include <vm/as.h>
+#include <vm/kpm.h>
+#include <vm/seg_kpm.h>
+#include <sys/mman.h>
+#include <sys/pathname.h>
+#include <sys/cmn_err.h>
+#include <sys/errno.h>
+#include <sys/unistd.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/dirent.h>
+#include <sys/policy.h>
+#include <sys/sunddi.h>
+#include <sys/filio.h>
+#include <sys/sid.h>
+#include "fs/fs_subr.h"
+#include <sys/zfs_ctldir.h>
+#include <sys/zfs_fuid.h>
+#include <sys/zfs_sa.h>
+#include <sys/dnlc.h>
+#include <sys/zfs_rlock.h>
+#include <sys/extdirent.h>
+#include <sys/kidmap.h>
+#include <sys/cred.h>
+#include <sys/attr.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) VN_RELE() 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 VN_RELE() within a tx then use VN_RELE_ASYNC().
+ *
+ * (3) All range locks must be grabbed before calling dmu_tx_assign(),
+ * as they can span dmu_tx_assign() calls.
+ *
+ * (4) Always pass TXG_NOWAIT as the second argument to dmu_tx_assign().
+ * This is critical because we don't want to block while holding locks.
+ * 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.
+ *
+ * (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 VN_HOLD())
+ * 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, TXG_NOWAIT); // try to assign
+ * if (error) {
+ * rw_exit(...); // drop locks
+ * zfs_dirent_unlock(dl); // unlock directory entry
+ * VN_RELE(...); // release held vnodes
+ * if (error == ERESTART) {
+ * 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
+ * VN_RELE(...); // release held vnodes
+ * zil_commit(zilog, foid); // synchronous when necessary
+ * ZFS_EXIT(zfsvfs); // finished in zfs
+ * return (error); // done, report error
+ */
+
+/* ARGSUSED */
+static int
+zfs_open(vnode_t **vpp, int flag, cred_t *cr, caller_context_t *ct)
+{
+ znode_t *zp = VTOZ(*vpp);
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ if ((flag & FWRITE) && (zp->z_pflags & ZFS_APPENDONLY) &&
+ ((flag & FAPPEND) == 0)) {
+ ZFS_EXIT(zfsvfs);
+ return (EPERM);
+ }
+
+ if (!zfs_has_ctldir(zp) && zp->z_zfsvfs->z_vscan &&
+ ZTOV(zp)->v_type == VREG &&
+ !(zp->z_pflags & ZFS_AV_QUARANTINED) && zp->z_size > 0) {
+ if (fs_vscan(*vpp, cr, 0) != 0) {
+ ZFS_EXIT(zfsvfs);
+ return (EACCES);
+ }
+ }
+
+ /* Keep a count of the synchronous opens in the znode */
+ if (flag & (FSYNC | FDSYNC))
+ atomic_inc_32(&zp->z_sync_cnt);
+
+ ZFS_EXIT(zfsvfs);
+ return (0);
+}
+
+/* ARGSUSED */
+static int
+zfs_close(vnode_t *vp, int flag, int count, offset_t offset, cred_t *cr,
+ caller_context_t *ct)
+{
+ znode_t *zp = VTOZ(vp);
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+
+ /*
+ * Clean up any locks held by this process on the vp.
+ */
+ cleanlocks(vp, ddi_get_pid(), 0);
+ cleanshares(vp, ddi_get_pid());
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ /* Decrement the synchronous opens in the znode */
+ if ((flag & (FSYNC | FDSYNC)) && (count == 1))
+ atomic_dec_32(&zp->z_sync_cnt);
+
+ if (!zfs_has_ctldir(zp) && zp->z_zfsvfs->z_vscan &&
+ ZTOV(zp)->v_type == VREG &&
+ !(zp->z_pflags & ZFS_AV_QUARANTINED) && zp->z_size > 0)
+ VERIFY(fs_vscan(vp, cr, 1) == 0);
+
+ ZFS_EXIT(zfsvfs);
+ return (0);
+}
+
+/*
+ * Lseek support for finding holes (cmd == _FIO_SEEK_HOLE) and
+ * data (cmd == _FIO_SEEK_DATA). "off" is an in/out parameter.
+ */
+static int
+zfs_holey(vnode_t *vp, int cmd, offset_t *off)
+{
+ znode_t *zp = VTOZ(vp);
+ uint64_t noff = (uint64_t)*off; /* new offset */
+ uint64_t file_sz;
+ int error;
+ boolean_t hole;
+
+ file_sz = zp->z_size;
+ if (noff >= file_sz) {
+ return (ENXIO);
+ }
+
+ if (cmd == _FIO_SEEK_HOLE)
+ hole = B_TRUE;
+ else
+ hole = B_FALSE;
+
+ error = dmu_offset_next(zp->z_zfsvfs->z_os, zp->z_id, hole, &noff);
+
+ /* end of file? */
+ if ((error == ESRCH) || (noff > file_sz)) {
+ /*
+ * Handle the virtual hole at the end of file.
+ */
+ if (hole) {
+ *off = file_sz;
+ return (0);
+ }
+ return (ENXIO);
+ }
+
+ if (noff < *off)
+ return (error);
+ *off = noff;
+ return (error);
+}
+
+/* ARGSUSED */
+static int
+zfs_ioctl(vnode_t *vp, int com, intptr_t data, int flag, cred_t *cred,
+ int *rvalp, caller_context_t *ct)
+{
+ offset_t off;
+ int error;
+ zfsvfs_t *zfsvfs;
+ znode_t *zp;
+
+ switch (com) {
+ case _FIOFFS:
+ return (zfs_sync(vp->v_vfsp, 0, cred));
+
+ /*
+ * The following two ioctls are used by bfu. Faking out,
+ * necessary to avoid bfu errors.
+ */
+ case _FIOGDIO:
+ case _FIOSDIO:
+ return (0);
+
+ case _FIO_SEEK_DATA:
+ case _FIO_SEEK_HOLE:
+ if (ddi_copyin((void *)data, &off, sizeof (off), flag))
+ return (EFAULT);
+
+ zp = VTOZ(vp);
+ zfsvfs = zp->z_zfsvfs;
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ /* offset parameter is in/out */
+ error = zfs_holey(vp, com, &off);
+ ZFS_EXIT(zfsvfs);
+ if (error)
+ return (error);
+ if (ddi_copyout(&off, (void *)data, sizeof (off), flag))
+ return (EFAULT);
+ return (0);
+ }
+ return (ENOTTY);
+}
+
+/*
+ * Utility functions to map and unmap a single physical page. These
+ * are used to manage the mappable copies of ZFS file data, and therefore
+ * do not update ref/mod bits.
+ */
+caddr_t
+zfs_map_page(page_t *pp, enum seg_rw rw)
+{
+ if (kpm_enable)
+ return (hat_kpm_mapin(pp, 0));
+ ASSERT(rw == S_READ || rw == S_WRITE);
+ return (ppmapin(pp, PROT_READ | ((rw == S_WRITE) ? PROT_WRITE : 0),
+ (caddr_t)-1));
+}
+
+void
+zfs_unmap_page(page_t *pp, caddr_t addr)
+{
+ if (kpm_enable) {
+ hat_kpm_mapout(pp, 0, addr);
+ } else {
+ ppmapout(addr);
+ }
+}
+
+/*
+ * 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.
+ */
+static void
+update_pages(vnode_t *vp, int64_t start, int len, objset_t *os, uint64_t oid)
+{
+ int64_t off;
+
+ off = start & PAGEOFFSET;
+ for (start &= PAGEMASK; len > 0; start += PAGESIZE) {
+ page_t *pp;
+ uint64_t nbytes = MIN(PAGESIZE - off, len);
+
+ if (pp = page_lookup(vp, start, SE_SHARED)) {
+ caddr_t va;
+
+ va = zfs_map_page(pp, S_WRITE);
+ (void) dmu_read(os, oid, start+off, nbytes, va+off,
+ DMU_READ_PREFETCH);
+ zfs_unmap_page(pp, va);
+ page_unlock(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.
+ */
+static int
+mappedread(vnode_t *vp, int nbytes, uio_t *uio)
+{
+ znode_t *zp = VTOZ(vp);
+ objset_t *os = zp->z_zfsvfs->z_os;
+ int64_t start, off;
+ int len = nbytes;
+ int error = 0;
+
+ start = uio->uio_loffset;
+ off = start & PAGEOFFSET;
+ for (start &= PAGEMASK; len > 0; start += PAGESIZE) {
+ page_t *pp;
+ uint64_t bytes = MIN(PAGESIZE - off, len);
+
+ if (pp = page_lookup(vp, start, SE_SHARED)) {
+ caddr_t va;
+
+ va = zfs_map_page(pp, S_READ);
+ error = uiomove(va + off, bytes, UIO_READ, uio);
+ zfs_unmap_page(pp, va);
+ page_unlock(pp);
+ } else {
+ error = dmu_read_uio(os, zp->z_id, uio, bytes);
+ }
+ len -= bytes;
+ off = 0;
+ if (error)
+ break;
+ }
+ return (error);
+}
+
+offset_t zfs_read_chunk_size = 1024 * 1024; /* Tunable */
+
+/*
+ * Read bytes from specified file into supplied buffer.
+ *
+ * IN: vp - vnode of file to be read from.
+ * uio - structure supplying read location, range info,
+ * and return buffer.
+ * ioflag - SYNC flags; used to provide FRSYNC semantics.
+ * cr - credentials of caller.
+ * ct - caller context
+ *
+ * OUT: uio - updated offset and range, buffer filled.
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * Side Effects:
+ * vp - atime updated if byte count > 0
+ */
+/* ARGSUSED */
+static int
+zfs_read(vnode_t *vp, uio_t *uio, int ioflag, cred_t *cr, caller_context_t *ct)
+{
+ znode_t *zp = VTOZ(vp);
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+ objset_t *os;
+ ssize_t n, nbytes;
+ int error;
+ rl_t *rl;
+ xuio_t *xuio = NULL;
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+ os = zfsvfs->z_os;
+
+ if (zp->z_pflags & ZFS_AV_QUARANTINED) {
+ ZFS_EXIT(zfsvfs);
+ return (EACCES);
+ }
+
+ /*
+ * Validate file offset
+ */
+ if (uio->uio_loffset < (offset_t)0) {
+ ZFS_EXIT(zfsvfs);
+ return (EINVAL);
+ }
+
+ /*
+ * Fasttrack empty reads
+ */
+ if (uio->uio_resid == 0) {
+ ZFS_EXIT(zfsvfs);
+ return (0);
+ }
+
+ /*
+ * Check for mandatory locks
+ */
+ if (MANDMODE(zp->z_mode)) {
+ if (error = chklock(vp, FREAD,
+ uio->uio_loffset, uio->uio_resid, uio->uio_fmode, ct)) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+ }
+
+ /*
+ * If we're in FRSYNC mode, sync out this znode before reading it.
+ */
+ if (ioflag & FRSYNC || zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
+ zil_commit(zfsvfs->z_log, zp->z_id);
+
+ /*
+ * Lock the range against changes.
+ */
+ rl = zfs_range_lock(zp, uio->uio_loffset, uio->uio_resid, RL_READER);
+
+ /*
+ * If we are reading past end-of-file we can skip
+ * to the end; but we might still need to set atime.
+ */
+ if (uio->uio_loffset >= zp->z_size) {
+ error = 0;
+ goto out;
+ }
+
+ ASSERT(uio->uio_loffset < zp->z_size);
+ n = MIN(uio->uio_resid, zp->z_size - uio->uio_loffset);
+
+ if ((uio->uio_extflg == UIO_XUIO) &&
+ (((xuio_t *)uio)->xu_type == UIOTYPE_ZEROCOPY)) {
+ int nblk;
+ int blksz = zp->z_blksz;
+ uint64_t offset = uio->uio_loffset;
+
+ xuio = (xuio_t *)uio;
+ if ((ISP2(blksz))) {
+ nblk = (P2ROUNDUP(offset + n, blksz) - P2ALIGN(offset,
+ blksz)) / blksz;
+ } else {
+ ASSERT(offset + n <= blksz);
+ nblk = 1;
+ }
+ (void) dmu_xuio_init(xuio, nblk);
+
+ if (vn_has_cached_data(vp)) {
+ /*
+ * For simplicity, we always allocate a full buffer
+ * even if we only expect to read a portion of a block.
+ */
+ while (--nblk >= 0) {
+ (void) dmu_xuio_add(xuio,
+ dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
+ blksz), 0, blksz);
+ }
+ }
+ }
+
+ while (n > 0) {
+ nbytes = MIN(n, zfs_read_chunk_size -
+ P2PHASE(uio->uio_loffset, zfs_read_chunk_size));
+
+ if (vn_has_cached_data(vp))
+ error = mappedread(vp, nbytes, uio);
+ else
+ error = dmu_read_uio(os, zp->z_id, uio, nbytes);
+ if (error) {
+ /* convert checksum errors into IO errors */
+ if (error == ECKSUM)
+ error = EIO;
+ break;
+ }
+
+ n -= nbytes;
+ }
+out:
+ zfs_range_unlock(rl);
+
+ ZFS_ACCESSTIME_STAMP(zfsvfs, zp);
+ ZFS_EXIT(zfsvfs);
+ return (error);
+}
+
+/*
+ * Write the bytes to a file.
+ *
+ * IN: vp - vnode of file to be written to.
+ * uio - structure supplying write location, range info,
+ * and data buffer.
+ * ioflag - FAPPEND flag set if in append mode.
+ * cr - credentials of caller.
+ * ct - caller context (NFS/CIFS fem monitor only)
+ *
+ * OUT: uio - updated offset and range.
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * Timestamps:
+ * vp - ctime|mtime updated if byte count > 0
+ */
+
+/* ARGSUSED */
+static int
+zfs_write(vnode_t *vp, uio_t *uio, int ioflag, cred_t *cr, caller_context_t *ct)
+{
+ znode_t *zp = VTOZ(vp);
+ rlim64_t limit = uio->uio_llimit;
+ ssize_t start_resid = uio->uio_resid;
+ ssize_t tx_bytes;
+ uint64_t end_size;
+ dmu_tx_t *tx;
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+ zilog_t *zilog;
+ offset_t woff;
+ ssize_t n, nbytes;
+ rl_t *rl;
+ int max_blksz = zfsvfs->z_max_blksz;
+ int error;
+ arc_buf_t *abuf;
+ iovec_t *aiov;
+ xuio_t *xuio = NULL;
+ int i_iov = 0;
+ int iovcnt = uio->uio_iovcnt;
+ iovec_t *iovp = uio->uio_iov;
+ int write_eof;
+ int count = 0;
+ sa_bulk_attr_t bulk[4];
+ uint64_t mtime[2], ctime[2];
+
+ /*
+ * Fasttrack empty write
+ */
+ n = start_resid;
+ if (n == 0)
+ return (0);
+
+ if (limit == RLIM64_INFINITY || limit > MAXOFFSET_T)
+ limit = MAXOFFSET_T;
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
+ &zp->z_size, 8);
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
+ &zp->z_pflags, 8);
+
+ /*
+ * If immutable or not appending then return EPERM
+ */
+ if ((zp->z_pflags & (ZFS_IMMUTABLE | ZFS_READONLY)) ||
+ ((zp->z_pflags & ZFS_APPENDONLY) && !(ioflag & FAPPEND) &&
+ (uio->uio_loffset < zp->z_size))) {
+ ZFS_EXIT(zfsvfs);
+ return (EPERM);
+ }
+
+ zilog = zfsvfs->z_log;
+
+ /*
+ * Validate file offset
+ */
+ woff = ioflag & FAPPEND ? zp->z_size : uio->uio_loffset;
+ if (woff < 0) {
+ ZFS_EXIT(zfsvfs);
+ return (EINVAL);
+ }
+
+ /*
+ * Check for mandatory locks before calling zfs_range_lock()
+ * in order to prevent a deadlock with locks set via fcntl().
+ */
+ if (MANDMODE((mode_t)zp->z_mode) &&
+ (error = chklock(vp, FWRITE, woff, n, uio->uio_fmode, ct)) != 0) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ /*
+ * Pre-fault the pages to ensure slow (eg NFS) pages
+ * don't hold up txg.
+ * Skip this if uio contains loaned arc_buf.
+ */
+ if ((uio->uio_extflg == UIO_XUIO) &&
+ (((xuio_t *)uio)->xu_type == UIOTYPE_ZEROCOPY))
+ xuio = (xuio_t *)uio;
+ else
+ uio_prefaultpages(MIN(n, max_blksz), uio);
+
+ /*
+ * If in append mode, set the io offset pointer to eof.
+ */
+ if (ioflag & FAPPEND) {
+ /*
+ * Obtain an appending range lock to guarantee file append
+ * semantics. We reset the write offset once we have the lock.
+ */
+ rl = zfs_range_lock(zp, 0, n, RL_APPEND);
+ woff = rl->r_off;
+ if (rl->r_len == UINT64_MAX) {
+ /*
+ * We overlocked the file because this write will cause
+ * the file block size to increase.
+ * Note that zp_size cannot change with this lock held.
+ */
+ woff = zp->z_size;
+ }
+ uio->uio_loffset = woff;
+ } else {
+ /*
+ * Note that if the file block size will change as a result of
+ * this write, then this range lock will lock the entire file
+ * so that we can re-write the block safely.
+ */
+ rl = zfs_range_lock(zp, woff, n, RL_WRITER);
+ }
+
+ if (woff >= limit) {
+ zfs_range_unlock(rl);
+ ZFS_EXIT(zfsvfs);
+ return (EFBIG);
+ }
+
+ if ((woff + n) > limit || woff > (limit - n))
+ n = limit - woff;
+
+ /* Will this write extend the file length? */
+ write_eof = (woff + n > zp->z_size);
+
+ end_size = MAX(zp->z_size, woff + n);
+
+ /*
+ * Write the file in reasonable size chunks. Each chunk is written
+ * in a separate transaction; this keeps the intent log records small
+ * and allows us to do more fine-grained space accounting.
+ */
+ while (n > 0) {
+ abuf = NULL;
+ woff = uio->uio_loffset;
+again:
+ if (zfs_owner_overquota(zfsvfs, zp, B_FALSE) ||
+ zfs_owner_overquota(zfsvfs, zp, B_TRUE)) {
+ if (abuf != NULL)
+ dmu_return_arcbuf(abuf);
+ error = EDQUOT;
+ break;
+ }
+
+ if (xuio && abuf == NULL) {
+ ASSERT(i_iov < iovcnt);
+ aiov = &iovp[i_iov];
+ abuf = dmu_xuio_arcbuf(xuio, i_iov);
+ dmu_xuio_clear(xuio, i_iov);
+ DTRACE_PROBE3(zfs_cp_write, int, i_iov,
+ iovec_t *, aiov, arc_buf_t *, abuf);
+ ASSERT((aiov->iov_base == abuf->b_data) ||
+ ((char *)aiov->iov_base - (char *)abuf->b_data +
+ aiov->iov_len == arc_buf_size(abuf)));
+ i_iov++;
+ } else if (abuf == NULL && n >= max_blksz &&
+ woff >= zp->z_size &&
+ P2PHASE(woff, max_blksz) == 0 &&
+ zp->z_blksz == max_blksz) {
+ /*
+ * This write covers a full block. "Borrow" a buffer
+ * from the dmu so that we can fill it before we enter
+ * a transaction. This avoids the possibility of
+ * holding up the transaction if the data copy hangs
+ * up on a pagefault (e.g., from an NFS server mapping).
+ */
+ size_t cbytes;
+
+ abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
+ max_blksz);
+ ASSERT(abuf != NULL);
+ ASSERT(arc_buf_size(abuf) == max_blksz);
+ if (error = uiocopy(abuf->b_data, max_blksz,
+ UIO_WRITE, uio, &cbytes)) {
+ dmu_return_arcbuf(abuf);
+ break;
+ }
+ ASSERT(cbytes == max_blksz);
+ }
+
+ /*
+ * Start a transaction.
+ */
+ tx = dmu_tx_create(zfsvfs->z_os);
+ dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
+ dmu_tx_hold_write(tx, zp->z_id, woff, MIN(n, max_blksz));
+ zfs_sa_upgrade_txholds(tx, zp);
+ error = dmu_tx_assign(tx, TXG_NOWAIT);
+ if (error) {
+ if (error == ERESTART) {
+ dmu_tx_wait(tx);
+ dmu_tx_abort(tx);
+ goto again;
+ }
+ dmu_tx_abort(tx);
+ if (abuf != NULL)
+ dmu_return_arcbuf(abuf);
+ break;
+ }
+
+ /*
+ * If zfs_range_lock() over-locked we grow the blocksize
+ * and then reduce the lock range. This will only happen
+ * on the first iteration since zfs_range_reduce() will
+ * shrink down r_len to the appropriate size.
+ */
+ if (rl->r_len == UINT64_MAX) {
+ uint64_t new_blksz;
+
+ if (zp->z_blksz > max_blksz) {
+ ASSERT(!ISP2(zp->z_blksz));
+ new_blksz = MIN(end_size, SPA_MAXBLOCKSIZE);
+ } else {
+ new_blksz = MIN(end_size, max_blksz);
+ }
+ zfs_grow_blocksize(zp, new_blksz, tx);
+ zfs_range_reduce(rl, woff, n);
+ }
+
+ /*
+ * XXX - should we really limit each write to z_max_blksz?
+ * Perhaps we should use SPA_MAXBLOCKSIZE chunks?
+ */
+ nbytes = MIN(n, max_blksz - P2PHASE(woff, max_blksz));
+
+ if (abuf == NULL) {
+ tx_bytes = uio->uio_resid;
+ error = dmu_write_uio_dbuf(sa_get_db(zp->z_sa_hdl),
+ uio, nbytes, tx);
+ tx_bytes -= uio->uio_resid;
+ } else {
+ tx_bytes = nbytes;
+ ASSERT(xuio == NULL || tx_bytes == aiov->iov_len);
+ /*
+ * If this is not a full block write, but we are
+ * extending the file past EOF and this data starts
+ * block-aligned, use assign_arcbuf(). Otherwise,
+ * write via dmu_write().
+ */
+ if (tx_bytes < max_blksz && (!write_eof ||
+ aiov->iov_base != abuf->b_data)) {
+ ASSERT(xuio);
+ dmu_write(zfsvfs->z_os, zp->z_id, woff,
+ aiov->iov_len, aiov->iov_base, tx);
+ dmu_return_arcbuf(abuf);
+ xuio_stat_wbuf_copied();
+ } else {
+ ASSERT(xuio || tx_bytes == max_blksz);
+ dmu_assign_arcbuf(sa_get_db(zp->z_sa_hdl),
+ woff, abuf, tx);
+ }
+ ASSERT(tx_bytes <= uio->uio_resid);
+ uioskip(uio, tx_bytes);
+ }
+ if (tx_bytes && vn_has_cached_data(vp)) {
+ update_pages(vp, woff,
+ tx_bytes, zfsvfs->z_os, zp->z_id);
+ }
+
+ /*
+ * If we made no progress, we're done. If we made even
+ * partial progress, update the znode and ZIL accordingly.
+ */
+ if (tx_bytes == 0) {
+ (void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zfsvfs),
+ (void *)&zp->z_size, sizeof (uint64_t), tx);
+ dmu_tx_commit(tx);
+ ASSERT(error != 0);
+ break;
+ }
+
+ /*
+ * Clear Set-UID/Set-GID bits on successful write if not
+ * privileged and at least one of the excute bits is set.
+ *
+ * It would be nice to to this after all writes have
+ * been done, but that would still expose the ISUID/ISGID
+ * to another app after the partial write is committed.
+ *
+ * Note: we don't call zfs_fuid_map_id() here because
+ * user 0 is not an ephemeral uid.
+ */
+ mutex_enter(&zp->z_acl_lock);
+ if ((zp->z_mode & (S_IXUSR | (S_IXUSR >> 3) |
+ (S_IXUSR >> 6))) != 0 &&
+ (zp->z_mode & (S_ISUID | S_ISGID)) != 0 &&
+ secpolicy_vnode_setid_retain(cr,
+ (zp->z_mode & S_ISUID) != 0 && zp->z_uid == 0) != 0) {
+ uint64_t newmode;
+ zp->z_mode &= ~(S_ISUID | S_ISGID);
+ newmode = zp->z_mode;
+ (void) sa_update(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs),
+ (void *)&newmode, sizeof (uint64_t), tx);
+ }
+ mutex_exit(&zp->z_acl_lock);
+
+ zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime,
+ B_TRUE);
+
+ /*
+ * Update the file size (zp_size) if it has changed;
+ * account for possible concurrent updates.
+ */
+ while ((end_size = zp->z_size) < uio->uio_loffset) {
+ (void) atomic_cas_64(&zp->z_size, end_size,
+ uio->uio_loffset);
+ ASSERT(error == 0);
+ }
+ /*
+ * If we are replaying and eof is non zero then force
+ * the file size to the specified eof. Note, there's no
+ * concurrency during replay.
+ */
+ if (zfsvfs->z_replay && zfsvfs->z_replay_eof != 0)
+ zp->z_size = zfsvfs->z_replay_eof;
+
+ error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
+
+ zfs_log_write(zilog, tx, TX_WRITE, zp, woff, tx_bytes, ioflag);
+ dmu_tx_commit(tx);
+
+ if (error != 0)
+ break;
+ ASSERT(tx_bytes == nbytes);
+ n -= nbytes;
+
+ if (!xuio && n > 0)
+ uio_prefaultpages(MIN(n, max_blksz), uio);
+ }
+
+ zfs_range_unlock(rl);
+
+ /*
+ * If we're in replay mode, or we made no progress, return error.
+ * Otherwise, it's at least a partial write, so it's successful.
+ */
+ if (zfsvfs->z_replay || uio->uio_resid == start_resid) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ if (ioflag & (FSYNC | FDSYNC) ||
+ zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
+ zil_commit(zilog, zp->z_id);
+
+ ZFS_EXIT(zfsvfs);
+ return (0);
+}
+
+void
+zfs_get_done(zgd_t *zgd, int error)
+{
+ znode_t *zp = zgd->zgd_private;
+ objset_t *os = zp->z_zfsvfs->z_os;
+
+ if (zgd->zgd_db)
+ dmu_buf_rele(zgd->zgd_db, zgd);
+
+ zfs_range_unlock(zgd->zgd_rl);
+
+ /*
+ * Release the vnode asynchronously as we currently have the
+ * txg stopped from syncing.
+ */
+ VN_RELE_ASYNC(ZTOV(zp), dsl_pool_vnrele_taskq(dmu_objset_pool(os)));
+
+ if (error == 0 && zgd->zgd_bp)
+ zil_add_block(zgd->zgd_zilog, zgd->zgd_bp);
+
+ kmem_free(zgd, sizeof (zgd_t));
+}
+
+#ifdef DEBUG
+static int zil_fault_io = 0;
+#endif
+
+/*
+ * Get data to generate a TX_WRITE intent log record.
+ */
+int
+zfs_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio)
+{
+ zfsvfs_t *zfsvfs = arg;
+ objset_t *os = zfsvfs->z_os;
+ znode_t *zp;
+ uint64_t object = lr->lr_foid;
+ uint64_t offset = lr->lr_offset;
+ uint64_t size = lr->lr_length;
+ blkptr_t *bp = &lr->lr_blkptr;
+ dmu_buf_t *db;
+ zgd_t *zgd;
+ int error = 0;
+
+ ASSERT(zio != NULL);
+ ASSERT(size != 0);
+
+ /*
+ * Nothing to do if the file has been removed
+ */
+ if (zfs_zget(zfsvfs, object, &zp) != 0)
+ return (ENOENT);
+ if (zp->z_unlinked) {
+ /*
+ * Release the vnode asynchronously as we currently have the
+ * txg stopped from syncing.
+ */
+ VN_RELE_ASYNC(ZTOV(zp),
+ dsl_pool_vnrele_taskq(dmu_objset_pool(os)));
+ return (ENOENT);
+ }
+
+ zgd = (zgd_t *)kmem_zalloc(sizeof (zgd_t), KM_SLEEP);
+ zgd->zgd_zilog = zfsvfs->z_log;
+ zgd->zgd_private = zp;
+
+ /*
+ * Write records come in two flavors: immediate and indirect.
+ * For small writes it's cheaper to store the data with the
+ * log record (immediate); for large writes it's cheaper to
+ * sync the data and get a pointer to it (indirect) so that
+ * we don't have to write the data twice.
+ */
+ if (buf != NULL) { /* immediate write */
+ zgd->zgd_rl = zfs_range_lock(zp, offset, size, RL_READER);
+ /* test for truncation needs to be done while range locked */
+ if (offset >= zp->z_size) {
+ error = ENOENT;
+ } else {
+ error = dmu_read(os, object, offset, size, buf,
+ DMU_READ_NO_PREFETCH);
+ }
+ ASSERT(error == 0 || error == ENOENT);
+ } else { /* indirect write */
+ /*
+ * Have to lock the whole block to ensure when it's
+ * written out and it's checksum is being calculated
+ * that no one can change the data. We need to re-check
+ * blocksize after we get the lock in case it's changed!
+ */
+ for (;;) {
+ uint64_t blkoff;
+ size = zp->z_blksz;
+ blkoff = ISP2(size) ? P2PHASE(offset, size) : offset;
+ offset -= blkoff;
+ zgd->zgd_rl = zfs_range_lock(zp, offset, size,
+ RL_READER);
+ if (zp->z_blksz == size)
+ break;
+ offset += blkoff;
+ zfs_range_unlock(zgd->zgd_rl);
+ }
+ /* test for truncation needs to be done while range locked */
+ if (lr->lr_offset >= zp->z_size)
+ error = ENOENT;
+#ifdef DEBUG
+ if (zil_fault_io) {
+ error = EIO;
+ zil_fault_io = 0;
+ }
+#endif
+ if (error == 0)
+ error = dmu_buf_hold(os, object, offset, zgd, &db,
+ DMU_READ_NO_PREFETCH);
+
+ if (error == 0) {
+ zgd->zgd_db = db;
+ zgd->zgd_bp = bp;
+
+ ASSERT(db->db_offset == offset);
+ ASSERT(db->db_size == size);
+
+ error = dmu_sync(zio, lr->lr_common.lrc_txg,
+ zfs_get_done, zgd);
+ ASSERT(error || lr->lr_length <= zp->z_blksz);
+
+ /*
+ * On success, we need to wait for the write I/O
+ * initiated by dmu_sync() to complete before we can
+ * release this dbuf. We will finish everything up
+ * in the zfs_get_done() callback.
+ */
+ if (error == 0)
+ return (0);
+
+ if (error == EALREADY) {
+ lr->lr_common.lrc_txtype = TX_WRITE2;
+ error = 0;
+ }
+ }
+ }
+
+ zfs_get_done(zgd, error);
+
+ return (error);
+}
+
+/*ARGSUSED*/
+static int
+zfs_access(vnode_t *vp, int mode, int flag, cred_t *cr,
+ caller_context_t *ct)
+{
+ znode_t *zp = VTOZ(vp);
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+ int error;
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ if (flag & V_ACE_MASK)
+ error = zfs_zaccess(zp, mode, flag, B_FALSE, cr);
+ else
+ error = zfs_zaccess_rwx(zp, mode, flag, cr);
+
+ ZFS_EXIT(zfsvfs);
+ return (error);
+}
+
+/*
+ * If vnode is for a device return a specfs vnode instead.
+ */
+static int
+specvp_check(vnode_t **vpp, cred_t *cr)
+{
+ int error = 0;
+
+ if (IS_DEVVP(*vpp)) {
+ struct vnode *svp;
+
+ svp = specvp(*vpp, (*vpp)->v_rdev, (*vpp)->v_type, cr);
+ VN_RELE(*vpp);
+ if (svp == NULL)
+ error = ENOSYS;
+ *vpp = svp;
+ }
+ return (error);
+}
+
+
+/*
+ * Lookup an entry in a directory, or an extended attribute directory.
+ * If it exists, return a held vnode reference for it.
+ *
+ * IN: dvp - vnode of directory to search.
+ * nm - name of entry to lookup.
+ * pnp - full pathname to lookup [UNUSED].
+ * flags - LOOKUP_XATTR set if looking for an attribute.
+ * rdir - root directory vnode [UNUSED].
+ * cr - credentials of caller.
+ * ct - caller context
+ * direntflags - directory lookup flags
+ * realpnp - returned pathname.
+ *
+ * OUT: vpp - vnode of located entry, NULL if not found.
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * Timestamps:
+ * NA
+ */
+/* ARGSUSED */
+static int
+zfs_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, struct pathname *pnp,
+ int flags, vnode_t *rdir, cred_t *cr, caller_context_t *ct,
+ int *direntflags, pathname_t *realpnp)
+{
+ znode_t *zdp = VTOZ(dvp);
+ zfsvfs_t *zfsvfs = zdp->z_zfsvfs;
+ int error = 0;
+
+ /* fast path */
+ if (!(flags & (LOOKUP_XATTR | FIGNORECASE))) {
+
+ if (dvp->v_type != VDIR) {
+ return (ENOTDIR);
+ } else if (zdp->z_sa_hdl == NULL) {
+ return (EIO);
+ }
+
+ if (nm[0] == 0 || (nm[0] == '.' && nm[1] == '\0')) {
+ error = zfs_fastaccesschk_execute(zdp, cr);
+ if (!error) {
+ *vpp = dvp;
+ VN_HOLD(*vpp);
+ return (0);
+ }
+ return (error);
+ } else {
+ vnode_t *tvp = dnlc_lookup(dvp, nm);
+
+ if (tvp) {
+ error = zfs_fastaccesschk_execute(zdp, cr);
+ if (error) {
+ VN_RELE(tvp);
+ return (error);
+ }
+ if (tvp == DNLC_NO_VNODE) {
+ VN_RELE(tvp);
+ return (ENOENT);
+ } else {
+ *vpp = tvp;
+ return (specvp_check(vpp, cr));
+ }
+ }
+ }
+ }
+
+ DTRACE_PROBE2(zfs__fastpath__lookup__miss, vnode_t *, dvp, char *, nm);
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zdp);
+
+ *vpp = NULL;
+
+ if (flags & LOOKUP_XATTR) {
+ /*
+ * If the xattr property is off, refuse the lookup request.
+ */
+ if (!(zfsvfs->z_vfs->vfs_flag & VFS_XATTR)) {
+ ZFS_EXIT(zfsvfs);
+ return (EINVAL);
+ }
+
+ /*
+ * We don't allow recursive attributes..
+ * Maybe someday we will.
+ */
+ if (zdp->z_pflags & ZFS_XATTR) {
+ ZFS_EXIT(zfsvfs);
+ return (EINVAL);
+ }
+
+ if (error = zfs_get_xattrdir(VTOZ(dvp), vpp, cr, flags)) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ /*
+ * Do we have permission to get into attribute directory?
+ */
+
+ if (error = zfs_zaccess(VTOZ(*vpp), ACE_EXECUTE, 0,
+ B_FALSE, cr)) {
+ VN_RELE(*vpp);
+ *vpp = NULL;
+ }
+
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ if (dvp->v_type != VDIR) {
+ ZFS_EXIT(zfsvfs);
+ return (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 (EILSEQ);
+ }
+
+ error = zfs_dirlook(zdp, nm, vpp, flags, direntflags, realpnp);
+ if (error == 0)
+ error = specvp_check(vpp, cr);
+
+ 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 vp of the created or trunc'd file.
+ *
+ * IN: dvp - vnode 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 - large file flag [UNUSED].
+ * ct - caller context
+ * vsecp - ACL to be set
+ *
+ * OUT: vpp - vnode of created or trunc'd entry.
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * Timestamps:
+ * dvp - ctime|mtime updated if new entry created
+ * vp - ctime|mtime always, atime if new
+ */
+
+/* ARGSUSED */
+static int
+zfs_create(vnode_t *dvp, char *name, vattr_t *vap, vcexcl_t excl,
+ int mode, vnode_t **vpp, cred_t *cr, int flag, caller_context_t *ct,
+ vsecattr_t *vsecp)
+{
+ znode_t *zp, *dzp = VTOZ(dvp);
+ zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
+ zilog_t *zilog;
+ objset_t *os;
+ zfs_dirlock_t *dl;
+ dmu_tx_t *tx;
+ int error;
+ ksid_t *ksid;
+ uid_t uid;
+ gid_t gid = crgetgid(cr);
+ zfs_acl_ids_t acl_ids;
+ boolean_t fuid_dirtied;
+ boolean_t have_acl = B_FALSE;
+
+ /*
+ * If we have an ephemeral id, ACL, or XVATTR then
+ * make sure file system is at proper version
+ */
+
+ ksid = crgetsid(cr, KSID_OWNER);
+ if (ksid)
+ uid = ksid_getid(ksid);
+ else
+ uid = crgetuid(cr);
+
+ if (zfsvfs->z_use_fuids == B_FALSE &&
+ (vsecp || (vap->va_mask & AT_XVATTR) ||
+ IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid)))
+ return (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 (EILSEQ);
+ }
+
+ if (vap->va_mask & AT_XVATTR) {
+ if ((error = secpolicy_xvattr((xvattr_t *)vap,
+ crgetuid(cr), cr, vap->va_type)) != 0) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+ }
+top:
+ *vpp = NULL;
+
+ if ((vap->va_mode & VSVTX) && secpolicy_vnode_stky_modify(cr))
+ vap->va_mode &= ~VSVTX;
+
+ if (*name == '\0') {
+ /*
+ * Null component name refers to the directory itself.
+ */
+ VN_HOLD(dvp);
+ zp = dzp;
+ dl = NULL;
+ error = 0;
+ } else {
+ /* possible VN_HOLD(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 = EISDIR;
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+ }
+
+ if (zp == NULL) {
+ uint64_t txtype;
+
+ /*
+ * 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) &&
+ (vap->va_type != VREG)) {
+ if (have_acl)
+ zfs_acl_ids_free(&acl_ids);
+ 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 (zfs_acl_ids_overquota(zfsvfs, &acl_ids)) {
+ zfs_acl_ids_free(&acl_ids);
+ 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, TXG_NOWAIT);
+ if (error) {
+ zfs_dirent_unlock(dl);
+ if (error == ERESTART) {
+ 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);
+
+ if (fuid_dirtied)
+ zfs_fuid_sync(zfsvfs, tx);
+
+ (void) zfs_link_create(dl, zp, tx, ZNEW);
+ 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 & FAPPEND) ? 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 == EXCL) {
+ error = EEXIST;
+ goto out;
+ }
+ /*
+ * Can't open a directory for writing.
+ */
+ if ((ZTOV(zp)->v_type == VDIR) && (mode & S_IWRITE)) {
+ 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 ((ZTOV(zp)->v_type == VREG) &&
+ (vap->va_mask & AT_SIZE) && (vap->va_size == 0)) {
+ /* we can't hold any locks when calling zfs_freesp() */
+ zfs_dirent_unlock(dl);
+ dl = NULL;
+ error = zfs_freesp(zp, 0, 0, mode, TRUE);
+ if (error == 0) {
+ vnevent_create(ZTOV(zp), ct);
+ }
+ }
+ }
+out:
+
+ if (dl)
+ zfs_dirent_unlock(dl);
+
+ if (error) {
+ if (zp)
+ VN_RELE(ZTOV(zp));
+ } else {
+ *vpp = ZTOV(zp);
+ error = specvp_check(vpp, cr);
+ }
+
+ if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
+ zil_commit(zilog, 0);
+
+ ZFS_EXIT(zfsvfs);
+ return (error);
+}
+
+/*
+ * Remove an entry from a directory.
+ *
+ * IN: dvp - vnode of directory to remove entry from.
+ * name - name of entry to remove.
+ * cr - credentials of caller.
+ * ct - caller context
+ * flags - case flags
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * Timestamps:
+ * dvp - ctime|mtime
+ * vp - ctime (if nlink > 0)
+ */
+
+uint64_t null_xattr = 0;
+
+/*ARGSUSED*/
+static int
+zfs_remove(vnode_t *dvp, char *name, cred_t *cr, caller_context_t *ct,
+ int flags)
+{
+ znode_t *zp, *dzp = VTOZ(dvp);
+ znode_t *xzp;
+ vnode_t *vp;
+ zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
+ zilog_t *zilog;
+ uint64_t acl_obj, xattr_obj;
+ uint64_t xattr_obj_unlinked = 0;
+ uint64_t obj = 0;
+ 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;
+
+ 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);
+ }
+
+ vp = ZTOV(zp);
+
+ if (error = zfs_zaccess_delete(dzp, zp, cr)) {
+ goto out;
+ }
+
+ /*
+ * Need to use rmdir for removing directories.
+ */
+ if (vp->v_type == VDIR) {
+ error = EPERM;
+ goto out;
+ }
+
+ vnevent_remove(vp, dvp, name, ct);
+
+ if (realnmp)
+ dnlc_remove(dvp, realnmp->pn_buf);
+ else
+ dnlc_remove(dvp, name);
+
+ mutex_enter(&vp->v_lock);
+ may_delete_now = vp->v_count == 1 && !vn_has_cached_data(vp);
+ mutex_exit(&vp->v_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 vnode. 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 * DMU_MAX_DELETEBLKCNT;
+ /* 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);
+ ASSERT3U(error, ==, 0);
+ 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);
+
+ error = dmu_tx_assign(tx, TXG_NOWAIT);
+ if (error) {
+ zfs_dirent_unlock(dl);
+ VN_RELE(vp);
+ if (xzp)
+ VN_RELE(ZTOV(xzp));
+ if (error == ERESTART) {
+ dmu_tx_wait(tx);
+ dmu_tx_abort(tx);
+ goto top;
+ }
+ if (realnmp)
+ pn_free(realnmp);
+ dmu_tx_abort(tx);
+ 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);
+ mutex_enter(&vp->v_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 &&
+ vp->v_count == 1 && !vn_has_cached_data(vp) &&
+ xattr_obj == xattr_obj_unlinked && zfs_external_acl(zp) ==
+ acl_obj;
+ mutex_exit(&vp->v_lock);
+ }
+
+ if (delete_now) {
+ if (xattr_obj_unlinked) {
+ ASSERT3U(xzp->z_links, ==, 2);
+ mutex_enter(&xzp->z_lock);
+ xzp->z_unlinked = 1;
+ xzp->z_links = 0;
+ error = sa_update(xzp->z_sa_hdl, SA_ZPL_LINKS(zfsvfs),
+ &xzp->z_links, sizeof (xzp->z_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);
+ ASSERT3U(error, ==, 0);
+ }
+ mutex_enter(&vp->v_lock);
+ vp->v_count--;
+ ASSERT3U(vp->v_count, ==, 0);
+ mutex_exit(&vp->v_lock);
+ mutex_exit(&zp->z_lock);
+ zfs_znode_delete(zp, tx);
+ } 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);
+
+ dmu_tx_commit(tx);
+out:
+ if (realnmp)
+ pn_free(realnmp);
+
+ zfs_dirent_unlock(dl);
+
+ if (!delete_now)
+ VN_RELE(vp);
+ if (xzp)
+ VN_RELE(ZTOV(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 dvp using the name
+ * provided. Return a pointer to the inserted directory.
+ *
+ * IN: dvp - vnode of directory to add subdir to.
+ * dirname - name of new directory.
+ * vap - attributes of new directory.
+ * cr - credentials of caller.
+ * ct - caller context
+ * vsecp - ACL to be set
+ *
+ * OUT: vpp - vnode of created directory.
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * Timestamps:
+ * dvp - ctime|mtime updated
+ * vp - ctime|mtime|atime updated
+ */
+/*ARGSUSED*/
+static int
+zfs_mkdir(vnode_t *dvp, char *dirname, vattr_t *vap, vnode_t **vpp, cred_t *cr,
+ caller_context_t *ct, int flags, vsecattr_t *vsecp)
+{
+ znode_t *zp, *dzp = VTOZ(dvp);
+ zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
+ zilog_t *zilog;
+ zfs_dirlock_t *dl;
+ uint64_t txtype;
+ dmu_tx_t *tx;
+ int error;
+ int zf = ZNEW;
+ ksid_t *ksid;
+ uid_t uid;
+ gid_t gid = crgetgid(cr);
+ zfs_acl_ids_t acl_ids;
+ boolean_t fuid_dirtied;
+
+ ASSERT(vap->va_type == VDIR);
+
+ /*
+ * If we have an ephemeral id, ACL, or XVATTR then
+ * make sure file system is at proper version
+ */
+
+ ksid = crgetsid(cr, KSID_OWNER);
+ if (ksid)
+ uid = ksid_getid(ksid);
+ else
+ uid = crgetuid(cr);
+ if (zfsvfs->z_use_fuids == B_FALSE &&
+ (vsecp || (vap->va_mask & AT_XVATTR) ||
+ IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid)))
+ return (EINVAL);
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(dzp);
+ zilog = zfsvfs->z_log;
+
+ if (dzp->z_pflags & ZFS_XATTR) {
+ ZFS_EXIT(zfsvfs);
+ return (EINVAL);
+ }
+
+ if (zfsvfs->z_utf8 && u8_validate(dirname,
+ strlen(dirname), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
+ ZFS_EXIT(zfsvfs);
+ return (EILSEQ);
+ }
+ if (flags & FIGNORECASE)
+ zf |= ZCILOOK;
+
+ if (vap->va_mask & AT_XVATTR) {
+ if ((error = secpolicy_xvattr((xvattr_t *)vap,
+ crgetuid(cr), cr, vap->va_type)) != 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:
+ *vpp = 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_acl_ids_free(&acl_ids);
+ zfs_dirent_unlock(dl);
+ ZFS_EXIT(zfsvfs);
+ return (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, TXG_NOWAIT);
+ if (error) {
+ zfs_dirent_unlock(dl);
+ if (error == ERESTART) {
+ 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);
+
+ if (fuid_dirtied)
+ zfs_fuid_sync(zfsvfs, tx);
+
+ /*
+ * Now put new name in parent dir.
+ */
+ (void) zfs_link_create(dl, zp, tx, ZNEW);
+
+ *vpp = ZTOV(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);
+
+ 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);
+
+ ZFS_EXIT(zfsvfs);
+ return (0);
+}
+
+/*
+ * Remove a directory subdir entry. If the current working
+ * directory is the same as the subdir to be removed, the
+ * remove will fail.
+ *
+ * IN: dvp - vnode of directory to remove from.
+ * name - name of directory to be removed.
+ * cwd - vnode of current working directory.
+ * cr - credentials of caller.
+ * ct - caller context
+ * flags - case flags
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * Timestamps:
+ * dvp - ctime|mtime updated
+ */
+/*ARGSUSED*/
+static int
+zfs_rmdir(vnode_t *dvp, char *name, vnode_t *cwd, cred_t *cr,
+ caller_context_t *ct, int flags)
+{
+ znode_t *dzp = VTOZ(dvp);
+ znode_t *zp;
+ vnode_t *vp;
+ zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
+ zilog_t *zilog;
+ zfs_dirlock_t *dl;
+ dmu_tx_t *tx;
+ int error;
+ int zflg = ZEXISTS;
+
+ 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);
+ }
+
+ vp = ZTOV(zp);
+
+ if (error = zfs_zaccess_delete(dzp, zp, cr)) {
+ goto out;
+ }
+
+ if (vp->v_type != VDIR) {
+ error = ENOTDIR;
+ goto out;
+ }
+
+ if (vp == cwd) {
+ error = EINVAL;
+ goto out;
+ }
+
+ vnevent_rmdir(vp, dvp, name, ct);
+
+ /*
+ * Grab a lock on the directory to make sure that noone 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);
+ error = dmu_tx_assign(tx, TXG_NOWAIT);
+ if (error) {
+ rw_exit(&zp->z_parent_lock);
+ rw_exit(&zp->z_name_lock);
+ zfs_dirent_unlock(dl);
+ VN_RELE(vp);
+ if (error == ERESTART) {
+ dmu_tx_wait(tx);
+ dmu_tx_abort(tx);
+ goto top;
+ }
+ dmu_tx_abort(tx);
+ 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);
+ }
+
+ dmu_tx_commit(tx);
+
+ rw_exit(&zp->z_parent_lock);
+ rw_exit(&zp->z_name_lock);
+out:
+ zfs_dirent_unlock(dl);
+
+ VN_RELE(vp);
+
+ if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
+ zil_commit(zilog, 0);
+
+ ZFS_EXIT(zfsvfs);
+ return (error);
+}
+
+/*
+ * Read as many directory entries as will fit into the provided
+ * buffer from the given directory cursor position (specified in
+ * the uio structure.
+ *
+ * IN: vp - vnode of directory to read.
+ * uio - structure supplying read location, range info,
+ * and return buffer.
+ * cr - credentials of caller.
+ * ct - caller context
+ * flags - case flags
+ *
+ * OUT: uio - updated offset and range, buffer filled.
+ * eofp - set to true if end-of-file detected.
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * Timestamps:
+ * vp - 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 */
+static int
+zfs_readdir(vnode_t *vp, uio_t *uio, cred_t *cr, int *eofp,
+ caller_context_t *ct, int flags)
+{
+ znode_t *zp = VTOZ(vp);
+ iovec_t *iovp;
+ edirent_t *eodp;
+ dirent64_t *odp;
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+ objset_t *os;
+ caddr_t outbuf;
+ size_t bufsize;
+ zap_cursor_t zc;
+ zap_attribute_t zap;
+ uint_t bytes_wanted;
+ uint64_t offset; /* must be unsigned; checks for < 1 */
+ uint64_t parent;
+ int local_eof;
+ int outcount;
+ int error;
+ uint8_t prefetch;
+ boolean_t check_sysattrs;
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs),
+ &parent, sizeof (parent))) != 0) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ /*
+ * If we are not given an eof variable,
+ * use a local one.
+ */
+ if (eofp == NULL)
+ eofp = &local_eof;
+
+ /*
+ * Check for valid iov_len.
+ */
+ if (uio->uio_iov->iov_len <= 0) {
+ ZFS_EXIT(zfsvfs);
+ return (EINVAL);
+ }
+
+ /*
+ * Quit if directory has been removed (posix)
+ */
+ if ((*eofp = zp->z_unlinked) != 0) {
+ ZFS_EXIT(zfsvfs);
+ return (0);
+ }
+
+ error = 0;
+ os = zfsvfs->z_os;
+ offset = uio->uio_loffset;
+ 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);
+ }
+
+ /*
+ * Get space to change directory entries into fs independent format.
+ */
+ iovp = uio->uio_iov;
+ bytes_wanted = iovp->iov_len;
+ if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1) {
+ bufsize = bytes_wanted;
+ outbuf = kmem_alloc(bufsize, KM_SLEEP);
+ odp = (struct dirent64 *)outbuf;
+ } else {
+ bufsize = bytes_wanted;
+ odp = (struct dirent64 *)iovp->iov_base;
+ }
+ eodp = (struct edirent *)odp;
+
+ /*
+ * If this VFS supports the system attribute view interface; and
+ * we're looking at an extended attribute directory; and we care
+ * about normalization conflicts on this vfs; then we must check
+ * for normalization conflicts with the sysattr name space.
+ */
+ check_sysattrs = vfs_has_feature(vp->v_vfsp, VFSFT_SYSATTR_VIEWS) &&
+ (vp->v_flag & V_XATTRDIR) && zfsvfs->z_norm &&
+ (flags & V_RDDIR_ENTFLAGS);
+
+ /*
+ * Transform to file-system independent format
+ */
+ outcount = 0;
+ while (outcount < bytes_wanted) {
+ ino64_t objnum;
+ ushort_t reclen;
+ off64_t *next = NULL;
+
+ /*
+ * Special case `.', `..', and `.zfs'.
+ */
+ if (offset == 0) {
+ (void) strcpy(zap.za_name, ".");
+ zap.za_normalization_conflict = 0;
+ objnum = zp->z_id;
+ } else if (offset == 1) {
+ (void) strcpy(zap.za_name, "..");
+ zap.za_normalization_conflict = 0;
+ objnum = parent;
+ } 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;
+ } else {
+ /*
+ * Grab next entry.
+ */
+ if (error = zap_cursor_retrieve(&zc, &zap)) {
+ if ((*eofp = (error == ENOENT)) != 0)
+ break;
+ else
+ goto update;
+ }
+
+ if (zap.za_integer_length != 8 ||
+ zap.za_num_integers != 1) {
+ cmn_err(CE_WARN, "zap_readdir: bad directory "
+ "entry, obj = %lld, offset = %lld\n",
+ (u_longlong_t)zp->z_id,
+ (u_longlong_t)offset);
+ error = ENXIO;
+ goto update;
+ }
+
+ objnum = ZFS_DIRENT_OBJ(zap.za_first_integer);
+ /*
+ * MacOS X can extract the object type here such as:
+ * uint8_t type = ZFS_DIRENT_TYPE(zap.za_first_integer);
+ */
+
+ if (check_sysattrs && !zap.za_normalization_conflict) {
+ zap.za_normalization_conflict =
+ xattr_sysattr_casechk(zap.za_name);
+ }
+ }
+
+ if (flags & V_RDDIR_ACCFILTER) {
+ /*
+ * If we have no access at all, don't include
+ * this entry in the returned information
+ */
+ znode_t *ezp;
+ if (zfs_zget(zp->z_zfsvfs, objnum, &ezp) != 0)
+ goto skip_entry;
+ if (!zfs_has_access(ezp, cr)) {
+ VN_RELE(ZTOV(ezp));
+ goto skip_entry;
+ }
+ VN_RELE(ZTOV(ezp));
+ }
+
+ if (flags & V_RDDIR_ENTFLAGS)
+ reclen = EDIRENT_RECLEN(strlen(zap.za_name));
+ else
+ reclen = DIRENT64_RECLEN(strlen(zap.za_name));
+
+ /*
+ * Will this entry fit in the buffer?
+ */
+ if (outcount + reclen > bufsize) {
+ /*
+ * Did we manage to fit anything in the buffer?
+ */
+ if (!outcount) {
+ error = EINVAL;
+ goto update;
+ }
+ break;
+ }
+ if (flags & V_RDDIR_ENTFLAGS) {
+ /*
+ * Add extended flag entry:
+ */
+ eodp->ed_ino = objnum;
+ eodp->ed_reclen = reclen;
+ /* NOTE: ed_off is the offset for the *next* entry */
+ next = &(eodp->ed_off);
+ eodp->ed_eflags = zap.za_normalization_conflict ?
+ ED_CASE_CONFLICT : 0;
+ (void) strncpy(eodp->ed_name, zap.za_name,
+ EDIRENT_NAMELEN(reclen));
+ eodp = (edirent_t *)((intptr_t)eodp + reclen);
+ } else {
+ /*
+ * Add normal entry:
+ */
+ odp->d_ino = objnum;
+ odp->d_reclen = reclen;
+ /* NOTE: d_off is the offset for the *next* entry */
+ next = &(odp->d_off);
+ (void) strncpy(odp->d_name, zap.za_name,
+ DIRENT64_NAMELEN(reclen));
+ odp = (dirent64_t *)((intptr_t)odp + reclen);
+ }
+ outcount += reclen;
+
+ ASSERT(outcount <= bufsize);
+
+ /* Prefetch znode */
+ if (prefetch)
+ dmu_prefetch(os, objnum, 0, 0);
+
+ skip_entry:
+ /*
+ * 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;
+ }
+ if (next)
+ *next = offset;
+ }
+ zp->z_zn_prefetch = B_FALSE; /* a lookup will re-enable pre-fetching */
+
+ if (uio->uio_segflg == UIO_SYSSPACE && uio->uio_iovcnt == 1) {
+ iovp->iov_base += outcount;
+ iovp->iov_len -= outcount;
+ uio->uio_resid -= outcount;
+ } else if (error = uiomove(outbuf, (long)outcount, UIO_READ, uio)) {
+ /*
+ * Reset the pointer.
+ */
+ offset = uio->uio_loffset;
+ }
+
+update:
+ zap_cursor_fini(&zc);
+ if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1)
+ kmem_free(outbuf, bufsize);
+
+ if (error == ENOENT)
+ error = 0;
+
+ ZFS_ACCESSTIME_STAMP(zfsvfs, zp);
+
+ uio->uio_loffset = offset;
+ ZFS_EXIT(zfsvfs);
+ return (error);
+}
+
+ulong_t zfs_fsync_sync_cnt = 4;
+
+static int
+zfs_fsync(vnode_t *vp, int syncflag, cred_t *cr, caller_context_t *ct)
+{
+ znode_t *zp = VTOZ(vp);
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+
+ /*
+ * Regardless of whether this is required for standards conformance,
+ * this is the logical behavior when fsync() is called on a file with
+ * dirty pages. We use B_ASYNC since the ZIL transactions are already
+ * going to be pushed out as part of the zil_commit().
+ */
+ if (vn_has_cached_data(vp) && !(syncflag & FNODSYNC) &&
+ (vp->v_type == VREG) && !(IS_SWAPVP(vp)))
+ (void) VOP_PUTPAGE(vp, (offset_t)0, (size_t)0, B_ASYNC, cr, ct);
+
+ (void) tsd_set(zfs_fsyncer_key, (void *)zfs_fsync_sync_cnt);
+
+ if (zfsvfs->z_os->os_sync != ZFS_SYNC_DISABLED) {
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+ zil_commit(zfsvfs->z_log, zp->z_id);
+ ZFS_EXIT(zfsvfs);
+ }
+ return (0);
+}
+
+
+/*
+ * Get the requested file attributes and place them in the provided
+ * vattr structure.
+ *
+ * IN: vp - vnode of file.
+ * vap - va_mask identifies requested attributes.
+ * If AT_XVATTR set, then optional attrs are requested
+ * flags - ATTR_NOACLCHECK (CIFS server context)
+ * cr - credentials of caller.
+ * ct - caller context
+ *
+ * OUT: vap - attribute values.
+ *
+ * RETURN: 0 (always succeeds)
+ */
+/* ARGSUSED */
+static int
+zfs_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr,
+ caller_context_t *ct)
+{
+ znode_t *zp = VTOZ(vp);
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+ int error = 0;
+ uint64_t links;
+ uint64_t mtime[2], ctime[2];
+ xvattr_t *xvap = (xvattr_t *)vap; /* vap may be an xvattr_t * */
+ xoptattr_t *xoap = NULL;
+ boolean_t skipaclchk = (flags & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
+ sa_bulk_attr_t bulk[2];
+ int count = 0;
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ zfs_fuid_map_ids(zp, cr, &vap->va_uid, &vap->va_gid);
+
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
+
+ if ((error = sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) != 0) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ /*
+ * If ACL is trivial don't bother looking for ACE_READ_ATTRIBUTES.
+ * Also, if we are the owner don't bother, since owner should
+ * always be allowed to read basic attributes of file.
+ */
+ if (!(zp->z_pflags & ZFS_ACL_TRIVIAL) &&
+ (vap->va_uid != crgetuid(cr))) {
+ if (error = zfs_zaccess(zp, ACE_READ_ATTRIBUTES, 0,
+ skipaclchk, cr)) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+ }
+
+ /*
+ * Return all attributes. It's cheaper to provide the answer
+ * than to determine whether we were asked the question.
+ */
+
+ mutex_enter(&zp->z_lock);
+ vap->va_type = vp->v_type;
+ vap->va_mode = zp->z_mode & MODEMASK;
+ vap->va_fsid = zp->z_zfsvfs->z_vfs->vfs_dev;
+ vap->va_nodeid = zp->z_id;
+ if ((vp->v_flag & VROOT) && zfs_show_ctldir(zp))
+ links = zp->z_links + 1;
+ else
+ links = zp->z_links;
+ vap->va_nlink = MIN(links, UINT32_MAX); /* nlink_t limit! */
+ vap->va_size = zp->z_size;
+ vap->va_rdev = vp->v_rdev;
+ vap->va_seq = zp->z_seq;
+
+ /*
+ * Add in any requested optional attributes and the create time.
+ * Also set the corresponding bits in the returned attribute bitmap.
+ */
+ if ((xoap = xva_getxoptattr(xvap)) != NULL && zfsvfs->z_use_fuids) {
+ if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) {
+ xoap->xoa_archive =
+ ((zp->z_pflags & ZFS_ARCHIVE) != 0);
+ XVA_SET_RTN(xvap, XAT_ARCHIVE);
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_READONLY)) {
+ xoap->xoa_readonly =
+ ((zp->z_pflags & ZFS_READONLY) != 0);
+ XVA_SET_RTN(xvap, XAT_READONLY);
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) {
+ xoap->xoa_system =
+ ((zp->z_pflags & ZFS_SYSTEM) != 0);
+ XVA_SET_RTN(xvap, XAT_SYSTEM);
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) {
+ xoap->xoa_hidden =
+ ((zp->z_pflags & ZFS_HIDDEN) != 0);
+ XVA_SET_RTN(xvap, XAT_HIDDEN);
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
+ xoap->xoa_nounlink =
+ ((zp->z_pflags & ZFS_NOUNLINK) != 0);
+ XVA_SET_RTN(xvap, XAT_NOUNLINK);
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
+ xoap->xoa_immutable =
+ ((zp->z_pflags & ZFS_IMMUTABLE) != 0);
+ XVA_SET_RTN(xvap, XAT_IMMUTABLE);
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
+ xoap->xoa_appendonly =
+ ((zp->z_pflags & ZFS_APPENDONLY) != 0);
+ XVA_SET_RTN(xvap, XAT_APPENDONLY);
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
+ xoap->xoa_nodump =
+ ((zp->z_pflags & ZFS_NODUMP) != 0);
+ XVA_SET_RTN(xvap, XAT_NODUMP);
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) {
+ xoap->xoa_opaque =
+ ((zp->z_pflags & ZFS_OPAQUE) != 0);
+ XVA_SET_RTN(xvap, XAT_OPAQUE);
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
+ xoap->xoa_av_quarantined =
+ ((zp->z_pflags & ZFS_AV_QUARANTINED) != 0);
+ XVA_SET_RTN(xvap, XAT_AV_QUARANTINED);
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
+ xoap->xoa_av_modified =
+ ((zp->z_pflags & ZFS_AV_MODIFIED) != 0);
+ XVA_SET_RTN(xvap, XAT_AV_MODIFIED);
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP) &&
+ vp->v_type == VREG) {
+ zfs_sa_get_scanstamp(zp, xvap);
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) {
+ uint64_t times[2];
+
+ (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_CRTIME(zfsvfs),
+ times, sizeof (times));
+ ZFS_TIME_DECODE(&xoap->xoa_createtime, times);
+ XVA_SET_RTN(xvap, XAT_CREATETIME);
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
+ xoap->xoa_reparse = ((zp->z_pflags & ZFS_REPARSE) != 0);
+ XVA_SET_RTN(xvap, XAT_REPARSE);
+ }
+ if (XVA_ISSET_REQ(xvap, XAT_GEN)) {
+ xoap->xoa_generation = zp->z_gen;
+ XVA_SET_RTN(xvap, XAT_GEN);
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) {
+ xoap->xoa_offline =
+ ((zp->z_pflags & ZFS_OFFLINE) != 0);
+ XVA_SET_RTN(xvap, XAT_OFFLINE);
+ }
+
+ if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) {
+ xoap->xoa_sparse =
+ ((zp->z_pflags & ZFS_SPARSE) != 0);
+ XVA_SET_RTN(xvap, XAT_SPARSE);
+ }
+ }
+
+ ZFS_TIME_DECODE(&vap->va_atime, zp->z_atime);
+ ZFS_TIME_DECODE(&vap->va_mtime, mtime);
+ ZFS_TIME_DECODE(&vap->va_ctime, ctime);
+
+ mutex_exit(&zp->z_lock);
+
+ sa_object_size(zp->z_sa_hdl, &vap->va_blksize, &vap->va_nblocks);
+
+ if (zp->z_blksz == 0) {
+ /*
+ * Block size hasn't been set; suggest maximal I/O transfers.
+ */
+ vap->va_blksize = zfsvfs->z_max_blksz;
+ }
+
+ ZFS_EXIT(zfsvfs);
+ return (0);
+}
+
+/*
+ * Set the file attributes to the values contained in the
+ * vattr structure.
+ *
+ * IN: vp - vnode of file to be modified.
+ * vap - new attribute values.
+ * If AT_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.
+ * ct - caller context
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * Timestamps:
+ * vp - ctime updated, mtime updated if size changed.
+ */
+/* ARGSUSED */
+static int
+zfs_setattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr,
+ caller_context_t *ct)
+{
+ znode_t *zp = VTOZ(vp);
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+ zilog_t *zilog;
+ dmu_tx_t *tx;
+ vattr_t oldva;
+ xvattr_t tmpxvattr;
+ uint_t mask = vap->va_mask;
+ uint_t saved_mask;
+ int trim_mask = 0;
+ uint64_t new_mode;
+ uint64_t new_uid, new_gid;
+ uint64_t xattr_obj;
+ uint64_t mtime[2], ctime[2];
+ znode_t *attrzp;
+ int need_policy = FALSE;
+ int err, err2;
+ 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;
+ sa_bulk_attr_t bulk[7], xattr_bulk[7];
+ int count = 0, xattr_count = 0;
+
+ if (mask == 0)
+ return (0);
+
+ if (mask & AT_NOSET)
+ return (EINVAL);
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ 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 & AT_UID) && IS_EPHEMERAL(vap->va_uid)) ||
+ ((mask & AT_GID) && IS_EPHEMERAL(vap->va_gid)) ||
+ (mask & AT_XVATTR))) {
+ ZFS_EXIT(zfsvfs);
+ return (EINVAL);
+ }
+
+ if (mask & AT_SIZE && vp->v_type == VDIR) {
+ ZFS_EXIT(zfsvfs);
+ return (EISDIR);
+ }
+
+ if (mask & AT_SIZE && vp->v_type != VREG && vp->v_type != VFIFO) {
+ ZFS_EXIT(zfsvfs);
+ return (EINVAL);
+ }
+
+ /*
+ * If this is an 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);
+
+ xva_init(&tmpxvattr);
+
+ /*
+ * Immutable files can only alter immutable bit and atime
+ */
+ if ((zp->z_pflags & ZFS_IMMUTABLE) &&
+ ((mask & (AT_SIZE|AT_UID|AT_GID|AT_MTIME|AT_MODE)) ||
+ ((mask & AT_XVATTR) && XVA_ISSET_REQ(xvap, XAT_CREATETIME)))) {
+ ZFS_EXIT(zfsvfs);
+ return (EPERM);
+ }
+
+ if ((mask & AT_SIZE) && (zp->z_pflags & ZFS_READONLY)) {
+ ZFS_EXIT(zfsvfs);
+ return (EPERM);
+ }
+
+ /*
+ * 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 & (AT_ATIME | AT_MTIME)) {
+ if (((mask & AT_ATIME) && TIMESPEC_OVERFLOW(&vap->va_atime)) ||
+ ((mask & AT_MTIME) && TIMESPEC_OVERFLOW(&vap->va_mtime))) {
+ ZFS_EXIT(zfsvfs);
+ return (EOVERFLOW);
+ }
+ }
+
+top:
+ attrzp = NULL;
+ aclp = NULL;
+
+ /* Can this be moved to before the top label? */
+ if (zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) {
+ ZFS_EXIT(zfsvfs);
+ return (EROFS);
+ }
+
+ /*
+ * First validate permissions
+ */
+
+ if (mask & AT_SIZE) {
+ err = zfs_zaccess(zp, ACE_WRITE_DATA, 0, skipaclchk, cr);
+ if (err) {
+ ZFS_EXIT(zfsvfs);
+ return (err);
+ }
+ /*
+ * 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) {
+ ZFS_EXIT(zfsvfs);
+ return (err);
+ }
+ }
+
+ if (mask & (AT_ATIME|AT_MTIME) ||
+ ((mask & AT_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 & (AT_UID|AT_GID)) {
+ int idmask = (mask & (AT_UID|AT_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 & AT_MODE))
+ vap->va_mode = zp->z_mode;
+
+ /*
+ * Take ownership or chgrp to group we are a member of
+ */
+
+ take_owner = (mask & AT_UID) && (vap->va_uid == crgetuid(cr));
+ take_group = (mask & AT_GID) &&
+ zfs_groupmember(zfsvfs, vap->va_gid, cr);
+
+ /*
+ * If both AT_UID and AT_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 == (AT_UID|AT_GID)) && take_owner && take_group) ||
+ ((idmask == AT_UID) && take_owner) ||
+ ((idmask == AT_GID) && take_group)) {
+ if (zfs_zaccess(zp, ACE_WRITE_OWNER, 0,
+ skipaclchk, cr) == 0) {
+ /*
+ * Remove setuid/setgid for non-privileged users
+ */
+ secpolicy_setid_clear(vap, cr);
+ trim_mask = (mask & (AT_UID|AT_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 & AT_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_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 ((vp->v_type != VREG &&
+ 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);
+ ZFS_EXIT(zfsvfs);
+ return (EPERM);
+ }
+
+ 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 & AT_MODE) {
+ if (zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr) == 0) {
+ err = secpolicy_setid_setsticky_clear(vp, vap,
+ &oldva, cr);
+ if (err) {
+ ZFS_EXIT(zfsvfs);
+ return (err);
+ }
+ trim_mask |= AT_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, vp, vap, &oldva, flags,
+ (int (*)(void *, int, cred_t *))zfs_zaccess_unix, zp);
+ if (err) {
+ ZFS_EXIT(zfsvfs);
+ return (err);
+ }
+
+ 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 & (AT_UID | AT_GID))) {
+ err = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
+ &xattr_obj, sizeof (xattr_obj));
+
+ if (err == 0 && xattr_obj) {
+ err = zfs_zget(zp->z_zfsvfs, xattr_obj, &attrzp);
+ if (err)
+ goto out2;
+ }
+ if (mask & AT_UID) {
+ new_uid = zfs_fuid_create(zfsvfs,
+ (uint64_t)vap->va_uid, cr, ZFS_OWNER, &fuidp);
+ if (new_uid != zp->z_uid &&
+ zfs_fuid_overquota(zfsvfs, B_FALSE, new_uid)) {
+ if (attrzp)
+ VN_RELE(ZTOV(attrzp));
+ err = EDQUOT;
+ goto out2;
+ }
+ }
+
+ if (mask & AT_GID) {
+ new_gid = zfs_fuid_create(zfsvfs, (uint64_t)vap->va_gid,
+ cr, ZFS_GROUP, &fuidp);
+ if (new_gid != zp->z_gid &&
+ zfs_fuid_overquota(zfsvfs, B_TRUE, new_gid)) {
+ if (attrzp)
+ VN_RELE(ZTOV(attrzp));
+ err = EDQUOT;
+ goto out2;
+ }
+ }
+ }
+ tx = dmu_tx_create(zfsvfs->z_os);
+
+ if (mask & AT_MODE) {
+ uint64_t pmode = zp->z_mode;
+ uint64_t acl_obj;
+ new_mode = (pmode & S_IFMT) | (vap->va_mode & ~S_IFMT);
+
+ zfs_acl_chmod_setattr(zp, &aclp, new_mode);
+
+ 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 & AT_XVATTR) &&
+ XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP))
+ 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_NOWAIT);
+ if (err) {
+ if (err == ERESTART)
+ dmu_tx_wait(tx);
+ 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 (mask & (AT_UID|AT_GID|AT_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 & (AT_UID|AT_GID|AT_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 (mask & (AT_UID|AT_GID)) {
+
+ if (mask & AT_UID) {
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
+ &new_uid, sizeof (new_uid));
+ zp->z_uid = new_uid;
+ if (attrzp) {
+ SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
+ SA_ZPL_UID(zfsvfs), NULL, &new_uid,
+ sizeof (new_uid));
+ attrzp->z_uid = new_uid;
+ }
+ }
+
+ if (mask & AT_GID) {
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs),
+ NULL, &new_gid, sizeof (new_gid));
+ zp->z_gid = new_gid;
+ if (attrzp) {
+ SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
+ SA_ZPL_GID(zfsvfs), NULL, &new_gid,
+ sizeof (new_gid));
+ attrzp->z_gid = new_gid;
+ }
+ }
+ if (!(mask & AT_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 & AT_MODE) {
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
+ &new_mode, sizeof (new_mode));
+ zp->z_mode = new_mode;
+ ASSERT3U((uintptr_t)aclp, !=, NULL);
+ err = zfs_aclset_common(zp, aclp, cr, tx);
+ ASSERT3U(err, ==, 0);
+ if (zp->z_acl_cached)
+ zfs_acl_free(zp->z_acl_cached);
+ zp->z_acl_cached = aclp;
+ aclp = NULL;
+ }
+
+
+ if (mask & AT_ATIME) {
+ ZFS_TIME_ENCODE(&vap->va_atime, zp->z_atime);
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL,
+ &zp->z_atime, sizeof (zp->z_atime));
+ }
+
+ if (mask & AT_MTIME) {
+ ZFS_TIME_ENCODE(&vap->va_mtime, mtime);
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL,
+ mtime, sizeof (mtime));
+ }
+
+ /* XXX - shouldn't this be done *before* the ATIME/MTIME checks? */
+ if (mask & AT_SIZE && !(mask & AT_MTIME)) {
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs),
+ NULL, mtime, sizeof (mtime));
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
+ &ctime, sizeof (ctime));
+ zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime,
+ B_TRUE);
+ } else if (mask != 0) {
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
+ &ctime, sizeof (ctime));
+ zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime, ctime,
+ B_TRUE);
+ if (attrzp) {
+ SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
+ SA_ZPL_CTIME(zfsvfs), NULL,
+ &ctime, sizeof (ctime));
+ zfs_tstamp_update_setup(attrzp, STATE_CHANGED,
+ mtime, ctime, B_TRUE);
+ }
+ }
+ /*
+ * Do this after setting timestamps to prevent timestamp
+ * update from toggling bit
+ */
+
+ if (xoap && (mask & AT_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(xvap, XAT_AV_SCANSTAMP))
+ ASSERT(vp->v_type == VREG);
+
+ 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 & (AT_UID|AT_GID|AT_MODE))
+ mutex_exit(&zp->z_acl_lock);
+
+ if (attrzp) {
+ if (mask & (AT_UID|AT_GID|AT_MODE))
+ mutex_exit(&attrzp->z_acl_lock);
+ mutex_exit(&attrzp->z_lock);
+ }
+out:
+ if (err == 0 && attrzp) {
+ err2 = sa_bulk_update(attrzp->z_sa_hdl, xattr_bulk,
+ xattr_count, tx);
+ ASSERT(err2 == 0);
+ }
+
+ if (attrzp)
+ VN_RELE(ZTOV(attrzp));
+ if (aclp)
+ zfs_acl_free(aclp);
+
+ if (fuidp) {
+ zfs_fuid_info_free(fuidp);
+ fuidp = NULL;
+ }
+
+ if (err) {
+ dmu_tx_abort(tx);
+ if (err == ERESTART)
+ goto top;
+ } else {
+ err2 = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
+ dmu_tx_commit(tx);
+ }
+
+out2:
+ if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
+ zil_commit(zilog, 0);
+
+ 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)
+ VN_RELE(ZTOV(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 = zp->z_zfsvfs->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 (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(zp->z_zfsvfs, oidp, &zp);
+ if (error)
+ return (error);
+ zl->zl_znode = zp;
+ }
+ (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(zp->z_zfsvfs),
+ &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: sdvp - Source directory containing the "old entry".
+ * snm - Old entry name.
+ * tdvp - Target directory to contain the "new entry".
+ * tnm - New entry name.
+ * cr - credentials of caller.
+ * ct - caller context
+ * flags - case flags
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * Timestamps:
+ * sdvp,tdvp - ctime|mtime updated
+ */
+/*ARGSUSED*/
+static int
+zfs_rename(vnode_t *sdvp, char *snm, vnode_t *tdvp, char *tnm, cred_t *cr,
+ caller_context_t *ct, int flags)
+{
+ znode_t *tdzp, *szp, *tzp;
+ znode_t *sdzp = VTOZ(sdvp);
+ zfsvfs_t *zfsvfs = sdzp->z_zfsvfs;
+ zilog_t *zilog;
+ vnode_t *realvp;
+ zfs_dirlock_t *sdl, *tdl;
+ dmu_tx_t *tx;
+ zfs_zlock_t *zl;
+ int cmp, serr, terr;
+ int error = 0;
+ int zflg = 0;
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(sdzp);
+ zilog = zfsvfs->z_log;
+
+ /*
+ * Make sure we have the real vp for the target directory.
+ */
+ if (VOP_REALVP(tdvp, &realvp, ct) == 0)
+ tdvp = realvp;
+
+ if (tdvp->v_vfsp != sdvp->v_vfsp || zfsctl_is_node(tdvp)) {
+ ZFS_EXIT(zfsvfs);
+ return (EXDEV);
+ }
+
+ tdzp = VTOZ(tdvp);
+ ZFS_VERIFY_ZP(tdzp);
+ if (zfsvfs->z_utf8 && u8_validate(tnm,
+ strlen(tnm), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
+ ZFS_EXIT(zfsvfs);
+ return (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 (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)
+ VN_RELE(ZTOV(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);
+ VN_RELE(ZTOV(szp));
+
+ if (sdzp == tdzp)
+ rw_exit(&sdzp->z_name_lock);
+
+ if (strcmp(tnm, "..") == 0)
+ terr = EINVAL;
+ ZFS_EXIT(zfsvfs);
+ return (terr);
+ }
+
+ /*
+ * 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 (ZTOV(szp)->v_type == VDIR) {
+ /*
+ * 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 (ZTOV(szp)->v_type == VDIR) {
+ if (ZTOV(tzp)->v_type != VDIR) {
+ error = ENOTDIR;
+ goto out;
+ }
+ } else {
+ if (ZTOV(tzp)->v_type == VDIR) {
+ 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;
+ }
+ }
+
+ vnevent_rename_src(ZTOV(szp), sdvp, snm, ct);
+ if (tzp)
+ vnevent_rename_dest(ZTOV(tzp), tdvp, tnm, ct);
+
+ /*
+ * notify the target directory if it is not the same
+ * as source directory.
+ */
+ if (tdvp != sdvp) {
+ vnevent_rename_dest_dir(tdvp, ct);
+ }
+
+ 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, 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);
+
+ VN_RELE(ZTOV(szp));
+ if (tzp)
+ VN_RELE(ZTOV(tzp));
+ if (error == ERESTART) {
+ dmu_tx_wait(tx);
+ dmu_tx_abort(tx);
+ goto top;
+ }
+ dmu_tx_abort(tx);
+ 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;
+
+ error = sa_update(szp->z_sa_hdl, SA_ZPL_FLAGS(zfsvfs),
+ (void *)&szp->z_pflags, sizeof (uint64_t), tx);
+ ASSERT3U(error, ==, 0);
+
+ 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);
+
+ /*
+ * Update path information for the target vnode
+ */
+ vn_renamepath(tdvp, ZTOV(szp), tnm,
+ strlen(tnm));
+ } 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);
+ }
+ }
+ }
+
+ dmu_tx_commit(tx);
+out:
+ if (zl != NULL)
+ zfs_rename_unlock(&zl);
+
+ zfs_dirent_unlock(sdl);
+ zfs_dirent_unlock(tdl);
+
+ if (sdzp == tdzp)
+ rw_exit(&sdzp->z_name_lock);
+
+
+ VN_RELE(ZTOV(szp));
+ if (tzp)
+ VN_RELE(ZTOV(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: dvp - Directory to contain new symbolic link.
+ * link - Name for new symlink entry.
+ * vap - Attributes of new entry.
+ * target - Target path of new symlink.
+ * cr - credentials of caller.
+ * ct - caller context
+ * flags - case flags
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * Timestamps:
+ * dvp - ctime|mtime updated
+ */
+/*ARGSUSED*/
+static int
+zfs_symlink(vnode_t *dvp, char *name, vattr_t *vap, char *link, cred_t *cr,
+ caller_context_t *ct, int flags)
+{
+ znode_t *zp, *dzp = VTOZ(dvp);
+ zfs_dirlock_t *dl;
+ dmu_tx_t *tx;
+ zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
+ 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;
+
+ ASSERT(vap->va_type == VLNK);
+
+ 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 (EILSEQ);
+ }
+ if (flags & FIGNORECASE)
+ zflg |= ZCILOOK;
+
+ if (len > MAXPATHLEN) {
+ ZFS_EXIT(zfsvfs);
+ return (ENAMETOOLONG);
+ }
+
+ if ((error = zfs_acl_ids_create(dzp, 0,
+ vap, cr, NULL, &acl_ids)) != 0) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+top:
+ /*
+ * 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_acl_ids_free(&acl_ids);
+ zfs_dirent_unlock(dl);
+ ZFS_EXIT(zfsvfs);
+ return (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, TXG_NOWAIT);
+ if (error) {
+ zfs_dirent_unlock(dl);
+ if (error == ERESTART) {
+ 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.
+ */
+ (void) zfs_link_create(dl, zp, tx, ZNEW);
+
+ if (flags & FIGNORECASE)
+ txtype |= TX_CI;
+ zfs_log_symlink(zilog, tx, txtype, dzp, zp, name, link);
+
+ zfs_acl_ids_free(&acl_ids);
+
+ dmu_tx_commit(tx);
+
+ zfs_dirent_unlock(dl);
+
+ VN_RELE(ZTOV(zp));
+
+ if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
+ zil_commit(zilog, 0);
+
+ ZFS_EXIT(zfsvfs);
+ return (error);
+}
+
+/*
+ * Return, in the buffer contained in the provided uio structure,
+ * the symbolic path referred to by vp.
+ *
+ * IN: vp - vnode of symbolic link.
+ * uoip - structure to contain the link path.
+ * cr - credentials of caller.
+ * ct - caller context
+ *
+ * OUT: uio - structure to contain the link path.
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * Timestamps:
+ * vp - atime updated
+ */
+/* ARGSUSED */
+static int
+zfs_readlink(vnode_t *vp, uio_t *uio, cred_t *cr, caller_context_t *ct)
+{
+ znode_t *zp = VTOZ(vp);
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+ 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_ACCESSTIME_STAMP(zfsvfs, zp);
+
+ ZFS_EXIT(zfsvfs);
+ return (error);
+}
+
+/*
+ * Insert a new entry into directory tdvp referencing svp.
+ *
+ * IN: tdvp - Directory to contain new entry.
+ * svp - vnode of new entry.
+ * name - name of new entry.
+ * cr - credentials of caller.
+ * ct - caller context
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * Timestamps:
+ * tdvp - ctime|mtime updated
+ * svp - ctime updated
+ */
+/* ARGSUSED */
+static int
+zfs_link(vnode_t *tdvp, vnode_t *svp, char *name, cred_t *cr,
+ caller_context_t *ct, int flags)
+{
+ znode_t *dzp = VTOZ(tdvp);
+ znode_t *tzp, *szp;
+ zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
+ zilog_t *zilog;
+ zfs_dirlock_t *dl;
+ dmu_tx_t *tx;
+ vnode_t *realvp;
+ int error;
+ int zf = ZNEW;
+ uint64_t parent;
+ uid_t owner;
+
+ ASSERT(tdvp->v_type == VDIR);
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(dzp);
+ zilog = zfsvfs->z_log;
+
+ if (VOP_REALVP(svp, &realvp, ct) == 0)
+ svp = realvp;
+
+ /*
+ * POSIX dictates that we return EPERM here.
+ * Better choices include ENOTSUP or EISDIR.
+ */
+ if (svp->v_type == VDIR) {
+ ZFS_EXIT(zfsvfs);
+ return (EPERM);
+ }
+
+ if (svp->v_vfsp != tdvp->v_vfsp || zfsctl_is_node(svp)) {
+ ZFS_EXIT(zfsvfs);
+ return (EXDEV);
+ }
+
+ szp = VTOZ(svp);
+ ZFS_VERIFY_ZP(szp);
+
+ /* 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 (EPERM);
+ }
+
+ if (zfsvfs->z_utf8 && u8_validate(name,
+ strlen(name), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
+ ZFS_EXIT(zfsvfs);
+ return (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) != (dzp->z_pflags & ZFS_XATTR)) {
+ ZFS_EXIT(zfsvfs);
+ return (EINVAL);
+ }
+
+
+ owner = zfs_fuid_map_id(zfsvfs, szp->z_uid, cr, ZFS_OWNER);
+ if (owner != crgetuid(cr) && secpolicy_basic_link(cr) != 0) {
+ ZFS_EXIT(zfsvfs);
+ return (EPERM);
+ }
+
+ if (error = zfs_zaccess(dzp, 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, dzp, 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, dzp->z_id, TRUE, name);
+ zfs_sa_upgrade_txholds(tx, szp);
+ zfs_sa_upgrade_txholds(tx, dzp);
+ error = dmu_tx_assign(tx, TXG_NOWAIT);
+ if (error) {
+ zfs_dirent_unlock(dl);
+ if (error == ERESTART) {
+ dmu_tx_wait(tx);
+ dmu_tx_abort(tx);
+ goto top;
+ }
+ dmu_tx_abort(tx);
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ error = zfs_link_create(dl, szp, tx, 0);
+
+ if (error == 0) {
+ uint64_t txtype = TX_LINK;
+ if (flags & FIGNORECASE)
+ txtype |= TX_CI;
+ zfs_log_link(zilog, tx, txtype, dzp, szp, name);
+ }
+
+ dmu_tx_commit(tx);
+
+ zfs_dirent_unlock(dl);
+
+ if (error == 0) {
+ vnevent_link(svp, ct);
+ }
+
+ if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
+ zil_commit(zilog, 0);
+
+ ZFS_EXIT(zfsvfs);
+ return (error);
+}
+
+/*
+ * zfs_null_putapage() is used when the file system has been force
+ * unmounted. It just drops the pages.
+ */
+/* ARGSUSED */
+static int
+zfs_null_putapage(vnode_t *vp, page_t *pp, u_offset_t *offp,
+ size_t *lenp, int flags, cred_t *cr)
+{
+ pvn_write_done(pp, B_INVAL|B_FORCE|B_ERROR);
+ return (0);
+}
+
+/*
+ * Push a page out to disk, klustering if possible.
+ *
+ * IN: vp - file to push page to.
+ * pp - page to push.
+ * flags - additional flags.
+ * cr - credentials of caller.
+ *
+ * OUT: offp - start of range pushed.
+ * lenp - len of range pushed.
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * NOTE: callers must have locked the page to be pushed. On
+ * exit, the page (and all other pages in the kluster) must be
+ * unlocked.
+ */
+/* ARGSUSED */
+static int
+zfs_putapage(vnode_t *vp, page_t *pp, u_offset_t *offp,
+ size_t *lenp, int flags, cred_t *cr)
+{
+ znode_t *zp = VTOZ(vp);
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+ dmu_tx_t *tx;
+ u_offset_t off, koff;
+ size_t len, klen;
+ int err;
+
+ off = pp->p_offset;
+ len = PAGESIZE;
+ /*
+ * If our blocksize is bigger than the page size, try to kluster
+ * multiple pages so that we write a full block (thus avoiding
+ * a read-modify-write).
+ */
+ if (off < zp->z_size && zp->z_blksz > PAGESIZE) {
+ klen = P2ROUNDUP((ulong_t)zp->z_blksz, PAGESIZE);
+ koff = ISP2(klen) ? P2ALIGN(off, (u_offset_t)klen) : 0;
+ ASSERT(koff <= zp->z_size);
+ if (koff + klen > zp->z_size)
+ klen = P2ROUNDUP(zp->z_size - koff, (uint64_t)PAGESIZE);
+ pp = pvn_write_kluster(vp, pp, &off, &len, koff, klen, flags);
+ }
+ ASSERT3U(btop(len), ==, btopr(len));
+
+ /*
+ * Can't push pages past end-of-file.
+ */
+ if (off >= zp->z_size) {
+ /* ignore all pages */
+ err = 0;
+ goto out;
+ } else if (off + len > zp->z_size) {
+ int npages = btopr(zp->z_size - off);
+ page_t *trunc;
+
+ page_list_break(&pp, &trunc, npages);
+ /* ignore pages past end of file */
+ if (trunc)
+ pvn_write_done(trunc, flags);
+ len = zp->z_size - off;
+ }
+
+ if (zfs_owner_overquota(zfsvfs, zp, B_FALSE) ||
+ zfs_owner_overquota(zfsvfs, zp, B_TRUE)) {
+ err = EDQUOT;
+ goto out;
+ }
+top:
+ tx = dmu_tx_create(zfsvfs->z_os);
+ dmu_tx_hold_write(tx, zp->z_id, off, len);
+
+ 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);
+ goto top;
+ }
+ dmu_tx_abort(tx);
+ goto out;
+ }
+
+ if (zp->z_blksz <= PAGESIZE) {
+ caddr_t va = zfs_map_page(pp, S_READ);
+ ASSERT3U(len, <=, PAGESIZE);
+ dmu_write(zfsvfs->z_os, zp->z_id, off, len, va, tx);
+ zfs_unmap_page(pp, va);
+ } else {
+ err = dmu_write_pages(zfsvfs->z_os, zp->z_id, off, len, pp, tx);
+ }
+
+ if (err == 0) {
+ uint64_t mtime[2], ctime[2];
+ sa_bulk_attr_t bulk[3];
+ int count = 0;
+
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL,
+ &mtime, 16);
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
+ &ctime, 16);
+ SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
+ &zp->z_pflags, 8);
+ zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime,
+ B_TRUE);
+ zfs_log_write(zfsvfs->z_log, tx, TX_WRITE, zp, off, len, 0);
+ }
+ dmu_tx_commit(tx);
+
+out:
+ pvn_write_done(pp, (err ? B_ERROR : 0) | flags);
+ if (offp)
+ *offp = off;
+ if (lenp)
+ *lenp = len;
+
+ return (err);
+}
+
+/*
+ * Copy the portion of the file indicated from pages into the file.
+ * The pages are stored in a page list attached to the files vnode.
+ *
+ * IN: vp - vnode of file to push page data to.
+ * off - position in file to put data.
+ * len - amount of data to write.
+ * flags - flags to control the operation.
+ * cr - credentials of caller.
+ * ct - caller context.
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * Timestamps:
+ * vp - ctime|mtime updated
+ */
+/*ARGSUSED*/
+static int
+zfs_putpage(vnode_t *vp, offset_t off, size_t len, int flags, cred_t *cr,
+ caller_context_t *ct)
+{
+ znode_t *zp = VTOZ(vp);
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+ page_t *pp;
+ size_t io_len;
+ u_offset_t io_off;
+ uint_t blksz;
+ rl_t *rl;
+ int error = 0;
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ /*
+ * Align this request to the file block size in case we kluster.
+ * XXX - this can result in pretty aggresive locking, which can
+ * impact simultanious read/write access. One option might be
+ * to break up long requests (len == 0) into block-by-block
+ * operations to get narrower locking.
+ */
+ blksz = zp->z_blksz;
+ if (ISP2(blksz))
+ io_off = P2ALIGN_TYPED(off, blksz, u_offset_t);
+ else
+ io_off = 0;
+ if (len > 0 && ISP2(blksz))
+ io_len = P2ROUNDUP_TYPED(len + (off - io_off), blksz, size_t);
+ else
+ io_len = 0;
+
+ if (io_len == 0) {
+ /*
+ * Search the entire vp list for pages >= io_off.
+ */
+ rl = zfs_range_lock(zp, io_off, UINT64_MAX, RL_WRITER);
+ error = pvn_vplist_dirty(vp, io_off, zfs_putapage, flags, cr);
+ goto out;
+ }
+ rl = zfs_range_lock(zp, io_off, io_len, RL_WRITER);
+
+ if (off > zp->z_size) {
+ /* past end of file */
+ zfs_range_unlock(rl);
+ ZFS_EXIT(zfsvfs);
+ return (0);
+ }
+
+ len = MIN(io_len, P2ROUNDUP(zp->z_size, PAGESIZE) - io_off);
+
+ for (off = io_off; io_off < off + len; io_off += io_len) {
+ if ((flags & B_INVAL) || ((flags & B_ASYNC) == 0)) {
+ pp = page_lookup(vp, io_off,
+ (flags & (B_INVAL | B_FREE)) ? SE_EXCL : SE_SHARED);
+ } else {
+ pp = page_lookup_nowait(vp, io_off,
+ (flags & B_FREE) ? SE_EXCL : SE_SHARED);
+ }
+
+ if (pp != NULL && pvn_getdirty(pp, flags)) {
+ int err;
+
+ /*
+ * Found a dirty page to push
+ */
+ err = zfs_putapage(vp, pp, &io_off, &io_len, flags, cr);
+ if (err)
+ error = err;
+ } else {
+ io_len = PAGESIZE;
+ }
+ }
+out:
+ zfs_range_unlock(rl);
+ if ((flags & B_ASYNC) == 0 || zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
+ zil_commit(zfsvfs->z_log, zp->z_id);
+ ZFS_EXIT(zfsvfs);
+ return (error);
+}
+
+/*ARGSUSED*/
+void
+zfs_inactive(vnode_t *vp, cred_t *cr, caller_context_t *ct)
+{
+ znode_t *zp = VTOZ(vp);
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+ int error;
+
+ rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_READER);
+ if (zp->z_sa_hdl == NULL) {
+ /*
+ * The fs has been unmounted, or we did a
+ * suspend/resume and this file no longer exists.
+ */
+ if (vn_has_cached_data(vp)) {
+ (void) pvn_vplist_dirty(vp, 0, zfs_null_putapage,
+ B_INVAL, cr);
+ }
+
+ mutex_enter(&zp->z_lock);
+ mutex_enter(&vp->v_lock);
+ ASSERT(vp->v_count == 1);
+ vp->v_count = 0;
+ mutex_exit(&vp->v_lock);
+ mutex_exit(&zp->z_lock);
+ rw_exit(&zfsvfs->z_teardown_inactive_lock);
+ zfs_znode_free(zp);
+ return;
+ }
+
+ /*
+ * Attempt to push any data in the page cache. If this fails
+ * we will get kicked out later in zfs_zinactive().
+ */
+ if (vn_has_cached_data(vp)) {
+ (void) pvn_vplist_dirty(vp, 0, zfs_putapage, B_INVAL|B_ASYNC,
+ cr);
+ }
+
+ if (zp->z_atime_dirty && zp->z_unlinked == 0) {
+ 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 {
+ mutex_enter(&zp->z_lock);
+ (void) sa_update(zp->z_sa_hdl, SA_ZPL_ATIME(zfsvfs),
+ (void *)&zp->z_atime, sizeof (zp->z_atime), tx);
+ zp->z_atime_dirty = 0;
+ mutex_exit(&zp->z_lock);
+ dmu_tx_commit(tx);
+ }
+ }
+
+ zfs_zinactive(zp);
+ rw_exit(&zfsvfs->z_teardown_inactive_lock);
+}
+
+/*
+ * Bounds-check the seek operation.
+ *
+ * IN: vp - vnode seeking within
+ * ooff - old file offset
+ * noffp - pointer to new file offset
+ * ct - caller context
+ *
+ * RETURN: 0 if success
+ * EINVAL if new offset invalid
+ */
+/* ARGSUSED */
+static int
+zfs_seek(vnode_t *vp, offset_t ooff, offset_t *noffp,
+ caller_context_t *ct)
+{
+ if (vp->v_type == VDIR)
+ return (0);
+ return ((*noffp < 0 || *noffp > MAXOFFSET_T) ? EINVAL : 0);
+}
+
+/*
+ * Pre-filter the generic locking function to trap attempts to place
+ * a mandatory lock on a memory mapped file.
+ */
+static int
+zfs_frlock(vnode_t *vp, int cmd, flock64_t *bfp, int flag, offset_t offset,
+ flk_callback_t *flk_cbp, cred_t *cr, caller_context_t *ct)
+{
+ znode_t *zp = VTOZ(vp);
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ /*
+ * We are following the UFS semantics with respect to mapcnt
+ * here: If we see that the file is mapped already, then we will
+ * return an error, but we don't worry about races between this
+ * function and zfs_map().
+ */
+ if (zp->z_mapcnt > 0 && MANDMODE(zp->z_mode)) {
+ ZFS_EXIT(zfsvfs);
+ return (EAGAIN);
+ }
+ ZFS_EXIT(zfsvfs);
+ return (fs_frlock(vp, cmd, bfp, flag, offset, flk_cbp, cr, ct));
+}
+
+/*
+ * If we can't find a page in the cache, we will create a new page
+ * and fill it with file data. For efficiency, we may try to fill
+ * multiple pages at once (klustering) to fill up the supplied page
+ * list. Note that the pages to be filled are held with an exclusive
+ * lock to prevent access by other threads while they are being filled.
+ */
+static int
+zfs_fillpage(vnode_t *vp, u_offset_t off, struct seg *seg,
+ caddr_t addr, page_t *pl[], size_t plsz, enum seg_rw rw)
+{
+ znode_t *zp = VTOZ(vp);
+ page_t *pp, *cur_pp;
+ objset_t *os = zp->z_zfsvfs->z_os;
+ u_offset_t io_off, total;
+ size_t io_len;
+ int err;
+
+ if (plsz == PAGESIZE || zp->z_blksz <= PAGESIZE) {
+ /*
+ * We only have a single page, don't bother klustering
+ */
+ io_off = off;
+ io_len = PAGESIZE;
+ pp = page_create_va(vp, io_off, io_len,
+ PG_EXCL | PG_WAIT, seg, addr);
+ } else {
+ /*
+ * Try to find enough pages to fill the page list
+ */
+ pp = pvn_read_kluster(vp, off, seg, addr, &io_off,
+ &io_len, off, plsz, 0);
+ }
+ if (pp == NULL) {
+ /*
+ * The page already exists, nothing to do here.
+ */
+ *pl = NULL;
+ return (0);
+ }
+
+ /*
+ * Fill the pages in the kluster.
+ */
+ cur_pp = pp;
+ for (total = io_off + io_len; io_off < total; io_off += PAGESIZE) {
+ caddr_t va;
+
+ ASSERT3U(io_off, ==, cur_pp->p_offset);
+ va = zfs_map_page(cur_pp, S_WRITE);
+ err = dmu_read(os, zp->z_id, io_off, PAGESIZE, va,
+ DMU_READ_PREFETCH);
+ zfs_unmap_page(cur_pp, va);
+ if (err) {
+ /* On error, toss the entire kluster */
+ pvn_read_done(pp, B_ERROR);
+ /* convert checksum errors into IO errors */
+ if (err == ECKSUM)
+ err = EIO;
+ return (err);
+ }
+ cur_pp = cur_pp->p_next;
+ }
+
+ /*
+ * Fill in the page list array from the kluster starting
+ * from the desired offset `off'.
+ * NOTE: the page list will always be null terminated.
+ */
+ pvn_plist_init(pp, pl, plsz, off, io_len, rw);
+ ASSERT(pl == NULL || (*pl)->p_offset == off);
+
+ return (0);
+}
+
+/*
+ * Return pointers to the pages for the file region [off, off + len]
+ * in the pl array. If plsz is greater than len, this function may
+ * also return page pointers from after the specified region
+ * (i.e. the region [off, off + plsz]). These additional pages are
+ * only returned if they are already in the cache, or were created as
+ * part of a klustered read.
+ *
+ * IN: vp - vnode of file to get data from.
+ * off - position in file to get data from.
+ * len - amount of data to retrieve.
+ * plsz - length of provided page list.
+ * seg - segment to obtain pages for.
+ * addr - virtual address of fault.
+ * rw - mode of created pages.
+ * cr - credentials of caller.
+ * ct - caller context.
+ *
+ * OUT: protp - protection mode of created pages.
+ * pl - list of pages created.
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * Timestamps:
+ * vp - atime updated
+ */
+/* ARGSUSED */
+static int
+zfs_getpage(vnode_t *vp, offset_t off, size_t len, uint_t *protp,
+ page_t *pl[], size_t plsz, struct seg *seg, caddr_t addr,
+ enum seg_rw rw, cred_t *cr, caller_context_t *ct)
+{
+ znode_t *zp = VTOZ(vp);
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+ page_t **pl0 = pl;
+ int err = 0;
+
+ /* we do our own caching, faultahead is unnecessary */
+ if (pl == NULL)
+ return (0);
+ else if (len > plsz)
+ len = plsz;
+ else
+ len = P2ROUNDUP(len, PAGESIZE);
+ ASSERT(plsz >= len);
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ if (protp)
+ *protp = PROT_ALL;
+
+ /*
+ * Loop through the requested range [off, off + len) looking
+ * for pages. If we don't find a page, we will need to create
+ * a new page and fill it with data from the file.
+ */
+ while (len > 0) {
+ if (*pl = page_lookup(vp, off, SE_SHARED))
+ *(pl+1) = NULL;
+ else if (err = zfs_fillpage(vp, off, seg, addr, pl, plsz, rw))
+ goto out;
+ while (*pl) {
+ ASSERT3U((*pl)->p_offset, ==, off);
+ off += PAGESIZE;
+ addr += PAGESIZE;
+ if (len > 0) {
+ ASSERT3U(len, >=, PAGESIZE);
+ len -= PAGESIZE;
+ }
+ ASSERT3U(plsz, >=, PAGESIZE);
+ plsz -= PAGESIZE;
+ pl++;
+ }
+ }
+
+ /*
+ * Fill out the page array with any pages already in the cache.
+ */
+ while (plsz > 0 &&
+ (*pl++ = page_lookup_nowait(vp, off, SE_SHARED))) {
+ off += PAGESIZE;
+ plsz -= PAGESIZE;
+ }
+out:
+ if (err) {
+ /*
+ * Release any pages we have previously locked.
+ */
+ while (pl > pl0)
+ page_unlock(*--pl);
+ } else {
+ ZFS_ACCESSTIME_STAMP(zfsvfs, zp);
+ }
+
+ *pl = NULL;
+
+ ZFS_EXIT(zfsvfs);
+ return (err);
+}
+
+/*
+ * Request a memory map for a section of a file. This code interacts
+ * with common code and the VM system as follows:
+ *
+ * common code calls mmap(), which ends up in smmap_common()
+ *
+ * this calls VOP_MAP(), which takes you into (say) zfs
+ *
+ * zfs_map() calls as_map(), passing segvn_create() as the callback
+ *
+ * segvn_create() creates the new segment and calls VOP_ADDMAP()
+ *
+ * zfs_addmap() updates z_mapcnt
+ */
+/*ARGSUSED*/
+static int
+zfs_map(vnode_t *vp, offset_t off, struct as *as, caddr_t *addrp,
+ size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, cred_t *cr,
+ caller_context_t *ct)
+{
+ znode_t *zp = VTOZ(vp);
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+ segvn_crargs_t vn_a;
+ int error;
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ if ((prot & PROT_WRITE) && (zp->z_pflags &
+ (ZFS_IMMUTABLE | ZFS_READONLY | ZFS_APPENDONLY))) {
+ ZFS_EXIT(zfsvfs);
+ return (EPERM);
+ }
+
+ if ((prot & (PROT_READ | PROT_EXEC)) &&
+ (zp->z_pflags & ZFS_AV_QUARANTINED)) {
+ ZFS_EXIT(zfsvfs);
+ return (EACCES);
+ }
+
+ if (vp->v_flag & VNOMAP) {
+ ZFS_EXIT(zfsvfs);
+ return (ENOSYS);
+ }
+
+ if (off < 0 || len > MAXOFFSET_T - off) {
+ ZFS_EXIT(zfsvfs);
+ return (ENXIO);
+ }
+
+ if (vp->v_type != VREG) {
+ ZFS_EXIT(zfsvfs);
+ return (ENODEV);
+ }
+
+ /*
+ * If file is locked, disallow mapping.
+ */
+ if (MANDMODE(zp->z_mode) && vn_has_flocks(vp)) {
+ ZFS_EXIT(zfsvfs);
+ return (EAGAIN);
+ }
+
+ as_rangelock(as);
+ error = choose_addr(as, addrp, len, off, ADDR_VACALIGN, flags);
+ if (error != 0) {
+ as_rangeunlock(as);
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ vn_a.vp = vp;
+ vn_a.offset = (u_offset_t)off;
+ vn_a.type = flags & MAP_TYPE;
+ vn_a.prot = prot;
+ vn_a.maxprot = maxprot;
+ vn_a.cred = cr;
+ vn_a.amp = NULL;
+ vn_a.flags = flags & ~MAP_TYPE;
+ vn_a.szc = 0;
+ vn_a.lgrp_mem_policy_flags = 0;
+
+ error = as_map(as, *addrp, len, segvn_create, &vn_a);
+
+ as_rangeunlock(as);
+ ZFS_EXIT(zfsvfs);
+ return (error);
+}
+
+/* ARGSUSED */
+static int
+zfs_addmap(vnode_t *vp, offset_t off, struct as *as, caddr_t addr,
+ size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, cred_t *cr,
+ caller_context_t *ct)
+{
+ uint64_t pages = btopr(len);
+
+ atomic_add_64(&VTOZ(vp)->z_mapcnt, pages);
+ return (0);
+}
+
+/*
+ * The reason we push dirty pages as part of zfs_delmap() is so that we get a
+ * more accurate mtime for the associated file. Since we don't have a way of
+ * detecting when the data was actually modified, we have to resort to
+ * heuristics. If an explicit msync() is done, then we mark the mtime when the
+ * last page is pushed. The problem occurs when the msync() call is omitted,
+ * which by far the most common case:
+ *
+ * open()
+ * mmap()
+ * <modify memory>
+ * munmap()
+ * close()
+ * <time lapse>
+ * putpage() via fsflush
+ *
+ * If we wait until fsflush to come along, we can have a modification time that
+ * is some arbitrary point in the future. In order to prevent this in the
+ * common case, we flush pages whenever a (MAP_SHARED, PROT_WRITE) mapping is
+ * torn down.
+ */
+/* ARGSUSED */
+static int
+zfs_delmap(vnode_t *vp, offset_t off, struct as *as, caddr_t addr,
+ size_t len, uint_t prot, uint_t maxprot, uint_t flags, cred_t *cr,
+ caller_context_t *ct)
+{
+ uint64_t pages = btopr(len);
+
+ ASSERT3U(VTOZ(vp)->z_mapcnt, >=, pages);
+ atomic_add_64(&VTOZ(vp)->z_mapcnt, -pages);
+
+ if ((flags & MAP_SHARED) && (prot & PROT_WRITE) &&
+ vn_has_cached_data(vp))
+ (void) VOP_PUTPAGE(vp, off, len, B_ASYNC, cr, ct);
+
+ 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: vp - vnode 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 [UNUSED].
+ * ct - caller context.
+ *
+ * RETURN: 0 if success
+ * error code if failure
+ *
+ * Timestamps:
+ * vp - ctime|mtime updated
+ */
+/* ARGSUSED */
+static int
+zfs_space(vnode_t *vp, int cmd, flock64_t *bfp, int flag,
+ offset_t offset, cred_t *cr, caller_context_t *ct)
+{
+ znode_t *zp = VTOZ(vp);
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+ uint64_t off, len;
+ int error;
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ if (cmd != F_FREESP) {
+ ZFS_EXIT(zfsvfs);
+ return (EINVAL);
+ }
+
+ if (error = convoff(vp, bfp, 0, offset)) {
+ ZFS_EXIT(zfsvfs);
+ return (error);
+ }
+
+ if (bfp->l_len < 0) {
+ ZFS_EXIT(zfsvfs);
+ return (EINVAL);
+ }
+
+ 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*/
+static int
+zfs_fid(vnode_t *vp, fid_t *fidp, caller_context_t *ct)
+{
+ znode_t *zp = VTOZ(vp);
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+ 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 = (zfsvfs->z_parent != zfsvfs) ? LONG_FID_LEN : SHORT_FID_LEN;
+ if (fidp->fid_len < size) {
+ fidp->fid_len = size;
+ ZFS_EXIT(zfsvfs);
+ return (ENOSPC);
+ }
+
+ 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));
+
+ if (size == LONG_FID_LEN) {
+ uint64_t objsetid = dmu_objset_id(zfsvfs->z_os);
+ zfid_long_t *zlfid;
+
+ zlfid = (zfid_long_t *)fidp;
+
+ for (i = 0; i < sizeof (zlfid->zf_setid); i++)
+ zlfid->zf_setid[i] = (uint8_t)(objsetid >> (8 * i));
+
+ /* XXX - this should be the generation number for the objset */
+ for (i = 0; i < sizeof (zlfid->zf_setgen); i++)
+ zlfid->zf_setgen[i] = 0;
+ }
+
+ ZFS_EXIT(zfsvfs);
+ return (0);
+}
+
+static int
+zfs_pathconf(vnode_t *vp, int cmd, ulong_t *valp, cred_t *cr,
+ caller_context_t *ct)
+{
+ znode_t *zp, *xzp;
+ zfsvfs_t *zfsvfs;
+ zfs_dirlock_t *dl;
+ int error;
+
+ switch (cmd) {
+ case _PC_LINK_MAX:
+ *valp = ULONG_MAX;
+ return (0);
+
+ case _PC_FILESIZEBITS:
+ *valp = 64;
+ return (0);
+
+ case _PC_XATTR_EXISTS:
+ zp = VTOZ(vp);
+ zfsvfs = zp->z_zfsvfs;
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+ *valp = 0;
+ error = zfs_dirent_lock(&dl, zp, "", &xzp,
+ ZXATTR | ZEXISTS | ZSHARED, NULL, NULL);
+ if (error == 0) {
+ zfs_dirent_unlock(dl);
+ if (!zfs_dirempty(xzp))
+ *valp = 1;
+ VN_RELE(ZTOV(xzp));
+ } else if (error == ENOENT) {
+ /*
+ * If there aren't extended attributes, it's the
+ * same as having zero of them.
+ */
+ error = 0;
+ }
+ ZFS_EXIT(zfsvfs);
+ return (error);
+
+ case _PC_SATTR_ENABLED:
+ case _PC_SATTR_EXISTS:
+ *valp = vfs_has_feature(vp->v_vfsp, VFSFT_SYSATTR_VIEWS) &&
+ (vp->v_type == VREG || vp->v_type == VDIR);
+ return (0);
+
+ case _PC_ACCESS_FILTERING:
+ *valp = vfs_has_feature(vp->v_vfsp, VFSFT_ACCESS_FILTER) &&
+ vp->v_type == VDIR;
+ return (0);
+
+ case _PC_ACL_ENABLED:
+ *valp = _ACL_ACE_ENABLED;
+ return (0);
+
+ case _PC_MIN_HOLE_SIZE:
+ *valp = (ulong_t)SPA_MINBLOCKSIZE;
+ return (0);
+
+ case _PC_TIMESTAMP_RESOLUTION:
+ /* nanosecond timestamp resolution */
+ *valp = 1L;
+ return (0);
+
+ default:
+ return (fs_pathconf(vp, cmd, valp, cr, ct));
+ }
+}
+
+/*ARGSUSED*/
+static int
+zfs_getsecattr(vnode_t *vp, vsecattr_t *vsecp, int flag, cred_t *cr,
+ caller_context_t *ct)
+{
+ znode_t *zp = VTOZ(vp);
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+ int error;
+ boolean_t skipaclchk = (flag & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+ error = zfs_getacl(zp, vsecp, skipaclchk, cr);
+ ZFS_EXIT(zfsvfs);
+
+ return (error);
+}
+
+/*ARGSUSED*/
+static int
+zfs_setsecattr(vnode_t *vp, vsecattr_t *vsecp, int flag, cred_t *cr,
+ caller_context_t *ct)
+{
+ znode_t *zp = VTOZ(vp);
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+ int error;
+ boolean_t skipaclchk = (flag & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
+ zilog_t *zilog = zfsvfs->z_log;
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+
+ error = zfs_setacl(zp, vsecp, skipaclchk, cr);
+
+ if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
+ zil_commit(zilog, 0);
+
+ ZFS_EXIT(zfsvfs);
+ return (error);
+}
+
+/*
+ * Tunable, both must be a power of 2.
+ *
+ * zcr_blksz_min: the smallest read we may consider to loan out an arcbuf
+ * zcr_blksz_max: if set to less than the file block size, allow loaning out of
+ * an arcbuf for a partial block read
+ */
+int zcr_blksz_min = (1 << 10); /* 1K */
+int zcr_blksz_max = (1 << 17); /* 128K */
+
+/*ARGSUSED*/
+static int
+zfs_reqzcbuf(vnode_t *vp, enum uio_rw ioflag, xuio_t *xuio, cred_t *cr,
+ caller_context_t *ct)
+{
+ znode_t *zp = VTOZ(vp);
+ zfsvfs_t *zfsvfs = zp->z_zfsvfs;
+ int max_blksz = zfsvfs->z_max_blksz;
+ uio_t *uio = &xuio->xu_uio;
+ ssize_t size = uio->uio_resid;
+ offset_t offset = uio->uio_loffset;
+ int blksz;
+ int fullblk, i;
+ arc_buf_t *abuf;
+ ssize_t maxsize;
+ int preamble, postamble;
+
+ if (xuio->xu_type != UIOTYPE_ZEROCOPY)
+ return (EINVAL);
+
+ ZFS_ENTER(zfsvfs);
+ ZFS_VERIFY_ZP(zp);
+ switch (ioflag) {
+ case UIO_WRITE:
+ /*
+ * Loan out an arc_buf for write if write size is bigger than
+ * max_blksz, and the file's block size is also max_blksz.
+ */
+ blksz = max_blksz;
+ if (size < blksz || zp->z_blksz != blksz) {
+ ZFS_EXIT(zfsvfs);
+ return (EINVAL);
+ }
+ /*
+ * Caller requests buffers for write before knowing where the
+ * write offset might be (e.g. NFS TCP write).
+ */
+ if (offset == -1) {
+ preamble = 0;
+ } else {
+ preamble = P2PHASE(offset, blksz);
+ if (preamble) {
+ preamble = blksz - preamble;
+ size -= preamble;
+ }
+ }
+
+ postamble = P2PHASE(size, blksz);
+ size -= postamble;
+
+ fullblk = size / blksz;
+ (void) dmu_xuio_init(xuio,
+ (preamble != 0) + fullblk + (postamble != 0));
+ DTRACE_PROBE3(zfs_reqzcbuf_align, int, preamble,
+ int, postamble, int,
+ (preamble != 0) + fullblk + (postamble != 0));
+
+ /*
+ * Have to fix iov base/len for partial buffers. They
+ * currently represent full arc_buf's.
+ */
+ if (preamble) {
+ /* data begins in the middle of the arc_buf */
+ abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
+ blksz);
+ ASSERT(abuf);
+ (void) dmu_xuio_add(xuio, abuf,
+ blksz - preamble, preamble);
+ }
+
+ for (i = 0; i < fullblk; i++) {
+ abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
+ blksz);
+ ASSERT(abuf);
+ (void) dmu_xuio_add(xuio, abuf, 0, blksz);
+ }
+
+ if (postamble) {
+ /* data ends in the middle of the arc_buf */
+ abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
+ blksz);
+ ASSERT(abuf);
+ (void) dmu_xuio_add(xuio, abuf, 0, postamble);
+ }
+ break;
+ case UIO_READ:
+ /*
+ * Loan out an arc_buf for read if the read size is larger than
+ * the current file block size. Block alignment is not
+ * considered. Partial arc_buf will be loaned out for read.
+ */
+ blksz = zp->z_blksz;
+ if (blksz < zcr_blksz_min)
+ blksz = zcr_blksz_min;
+ if (blksz > zcr_blksz_max)
+ blksz = zcr_blksz_max;
+ /* avoid potential complexity of dealing with it */
+ if (blksz > max_blksz) {
+ ZFS_EXIT(zfsvfs);
+ return (EINVAL);
+ }
+
+ maxsize = zp->z_size - uio->uio_loffset;
+ if (size > maxsize)
+ size = maxsize;
+
+ if (size < blksz || vn_has_cached_data(vp)) {
+ ZFS_EXIT(zfsvfs);
+ return (EINVAL);
+ }
+ break;
+ default:
+ ZFS_EXIT(zfsvfs);
+ return (EINVAL);
+ }
+
+ uio->uio_extflg = UIO_XUIO;
+ XUIO_XUZC_RW(xuio) = ioflag;
+ ZFS_EXIT(zfsvfs);
+ return (0);
+}
+
+/*ARGSUSED*/
+static int
+zfs_retzcbuf(vnode_t *vp, xuio_t *xuio, cred_t *cr, caller_context_t *ct)
+{
+ int i;
+ arc_buf_t *abuf;
+ int ioflag = XUIO_XUZC_RW(xuio);
+
+ ASSERT(xuio->xu_type == UIOTYPE_ZEROCOPY);
+
+ i = dmu_xuio_cnt(xuio);
+ while (i-- > 0) {
+ abuf = dmu_xuio_arcbuf(xuio, i);
+ /*
+ * if abuf == NULL, it must be a write buffer
+ * that has been returned in zfs_write().
+ */
+ if (abuf)
+ dmu_return_arcbuf(abuf);
+ ASSERT(abuf || ioflag == UIO_WRITE);
+ }
+
+ dmu_xuio_fini(xuio);
+ return (0);
+}
+
+/*
+ * Predeclare these here so that the compiler assumes that
+ * this is an "old style" function declaration that does
+ * not include arguments => we won't get type mismatch errors
+ * in the initializations that follow.
+ */
+static int zfs_inval();
+static int zfs_isdir();
+
+static int
+zfs_inval()
+{
+ return (EINVAL);
+}
+
+static int
+zfs_isdir()
+{
+ return (EISDIR);
+}
+/*
+ * Directory vnode operations template
+ */
+vnodeops_t *zfs_dvnodeops;
+const fs_operation_def_t zfs_dvnodeops_template[] = {
+ VOPNAME_OPEN, { .vop_open = zfs_open },
+ VOPNAME_CLOSE, { .vop_close = zfs_close },
+ VOPNAME_READ, { .error = zfs_isdir },
+ VOPNAME_WRITE, { .error = zfs_isdir },
+ VOPNAME_IOCTL, { .vop_ioctl = zfs_ioctl },
+ VOPNAME_GETATTR, { .vop_getattr = zfs_getattr },
+ VOPNAME_SETATTR, { .vop_setattr = zfs_setattr },
+ VOPNAME_ACCESS, { .vop_access = zfs_access },
+ VOPNAME_LOOKUP, { .vop_lookup = zfs_lookup },
+ VOPNAME_CREATE, { .vop_create = zfs_create },
+ VOPNAME_REMOVE, { .vop_remove = zfs_remove },
+ VOPNAME_LINK, { .vop_link = zfs_link },
+ VOPNAME_RENAME, { .vop_rename = zfs_rename },
+ VOPNAME_MKDIR, { .vop_mkdir = zfs_mkdir },
+ VOPNAME_RMDIR, { .vop_rmdir = zfs_rmdir },
+ VOPNAME_READDIR, { .vop_readdir = zfs_readdir },
+ VOPNAME_SYMLINK, { .vop_symlink = zfs_symlink },
+ VOPNAME_FSYNC, { .vop_fsync = zfs_fsync },
+ VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive },
+ VOPNAME_FID, { .vop_fid = zfs_fid },
+ VOPNAME_SEEK, { .vop_seek = zfs_seek },
+ VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf },
+ VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr },
+ VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr },
+ VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support },
+ NULL, NULL
+};
+
+/*
+ * Regular file vnode operations template
+ */
+vnodeops_t *zfs_fvnodeops;
+const fs_operation_def_t zfs_fvnodeops_template[] = {
+ VOPNAME_OPEN, { .vop_open = zfs_open },
+ VOPNAME_CLOSE, { .vop_close = zfs_close },
+ VOPNAME_READ, { .vop_read = zfs_read },
+ VOPNAME_WRITE, { .vop_write = zfs_write },
+ VOPNAME_IOCTL, { .vop_ioctl = zfs_ioctl },
+ VOPNAME_GETATTR, { .vop_getattr = zfs_getattr },
+ VOPNAME_SETATTR, { .vop_setattr = zfs_setattr },
+ VOPNAME_ACCESS, { .vop_access = zfs_access },
+ VOPNAME_LOOKUP, { .vop_lookup = zfs_lookup },
+ VOPNAME_RENAME, { .vop_rename = zfs_rename },
+ VOPNAME_FSYNC, { .vop_fsync = zfs_fsync },
+ VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive },
+ VOPNAME_FID, { .vop_fid = zfs_fid },
+ VOPNAME_SEEK, { .vop_seek = zfs_seek },
+ VOPNAME_FRLOCK, { .vop_frlock = zfs_frlock },
+ VOPNAME_SPACE, { .vop_space = zfs_space },
+ VOPNAME_GETPAGE, { .vop_getpage = zfs_getpage },
+ VOPNAME_PUTPAGE, { .vop_putpage = zfs_putpage },
+ VOPNAME_MAP, { .vop_map = zfs_map },
+ VOPNAME_ADDMAP, { .vop_addmap = zfs_addmap },
+ VOPNAME_DELMAP, { .vop_delmap = zfs_delmap },
+ VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf },
+ VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr },
+ VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr },
+ VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support },
+ VOPNAME_REQZCBUF, { .vop_reqzcbuf = zfs_reqzcbuf },
+ VOPNAME_RETZCBUF, { .vop_retzcbuf = zfs_retzcbuf },
+ NULL, NULL
+};
+
+/*
+ * Symbolic link vnode operations template
+ */
+vnodeops_t *zfs_symvnodeops;
+const fs_operation_def_t zfs_symvnodeops_template[] = {
+ VOPNAME_GETATTR, { .vop_getattr = zfs_getattr },
+ VOPNAME_SETATTR, { .vop_setattr = zfs_setattr },
+ VOPNAME_ACCESS, { .vop_access = zfs_access },
+ VOPNAME_RENAME, { .vop_rename = zfs_rename },
+ VOPNAME_READLINK, { .vop_readlink = zfs_readlink },
+ VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive },
+ VOPNAME_FID, { .vop_fid = zfs_fid },
+ VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf },
+ VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support },
+ NULL, NULL
+};
+
+/*
+ * special share hidden files vnode operations template
+ */
+vnodeops_t *zfs_sharevnodeops;
+const fs_operation_def_t zfs_sharevnodeops_template[] = {
+ VOPNAME_GETATTR, { .vop_getattr = zfs_getattr },
+ VOPNAME_ACCESS, { .vop_access = zfs_access },
+ VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive },
+ VOPNAME_FID, { .vop_fid = zfs_fid },
+ VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf },
+ VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr },
+ VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr },
+ VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support },
+ NULL, NULL
+};
+
+/*
+ * Extended attribute directory vnode operations template
+ * This template is identical to the directory vnodes
+ * operation template except for restricted operations:
+ * VOP_MKDIR()
+ * VOP_SYMLINK()
+ * Note that there are other restrictions embedded in:
+ * zfs_create() - restrict type to VREG
+ * zfs_link() - no links into/out of attribute space
+ * zfs_rename() - no moves into/out of attribute space
+ */
+vnodeops_t *zfs_xdvnodeops;
+const fs_operation_def_t zfs_xdvnodeops_template[] = {
+ VOPNAME_OPEN, { .vop_open = zfs_open },
+ VOPNAME_CLOSE, { .vop_close = zfs_close },
+ VOPNAME_IOCTL, { .vop_ioctl = zfs_ioctl },
+ VOPNAME_GETATTR, { .vop_getattr = zfs_getattr },
+ VOPNAME_SETATTR, { .vop_setattr = zfs_setattr },
+ VOPNAME_ACCESS, { .vop_access = zfs_access },
+ VOPNAME_LOOKUP, { .vop_lookup = zfs_lookup },
+ VOPNAME_CREATE, { .vop_create = zfs_create },
+ VOPNAME_REMOVE, { .vop_remove = zfs_remove },
+ VOPNAME_LINK, { .vop_link = zfs_link },
+ VOPNAME_RENAME, { .vop_rename = zfs_rename },
+ VOPNAME_MKDIR, { .error = zfs_inval },
+ VOPNAME_RMDIR, { .vop_rmdir = zfs_rmdir },
+ VOPNAME_READDIR, { .vop_readdir = zfs_readdir },
+ VOPNAME_SYMLINK, { .error = zfs_inval },
+ VOPNAME_FSYNC, { .vop_fsync = zfs_fsync },
+ VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive },
+ VOPNAME_FID, { .vop_fid = zfs_fid },
+ VOPNAME_SEEK, { .vop_seek = zfs_seek },
+ VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf },
+ VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr },
+ VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr },
+ VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support },
+ NULL, NULL
+};
+
+/*
+ * Error vnode operations template
+ */
+vnodeops_t *zfs_evnodeops;
+const fs_operation_def_t zfs_evnodeops_template[] = {
+ VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive },
+ VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf },
+ NULL, NULL
+};