v4.19.13 snapshot.
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
new file mode 100644
index 0000000..05db954
--- /dev/null
+++ b/fs/xfs/xfs_inode.c
@@ -0,0 +1,3597 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2000-2006 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ */
+#include <linux/log2.h>
+#include <linux/iversion.h>
+
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_sb.h"
+#include "xfs_mount.h"
+#include "xfs_defer.h"
+#include "xfs_inode.h"
+#include "xfs_da_format.h"
+#include "xfs_da_btree.h"
+#include "xfs_dir2.h"
+#include "xfs_attr_sf.h"
+#include "xfs_attr.h"
+#include "xfs_trans_space.h"
+#include "xfs_trans.h"
+#include "xfs_buf_item.h"
+#include "xfs_inode_item.h"
+#include "xfs_ialloc.h"
+#include "xfs_bmap.h"
+#include "xfs_bmap_util.h"
+#include "xfs_errortag.h"
+#include "xfs_error.h"
+#include "xfs_quota.h"
+#include "xfs_filestream.h"
+#include "xfs_cksum.h"
+#include "xfs_trace.h"
+#include "xfs_icache.h"
+#include "xfs_symlink.h"
+#include "xfs_trans_priv.h"
+#include "xfs_log.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_reflink.h"
+#include "xfs_dir2_priv.h"
+
+kmem_zone_t *xfs_inode_zone;
+
+/*
+ * Used in xfs_itruncate_extents(). This is the maximum number of extents
+ * freed from a file in a single transaction.
+ */
+#define XFS_ITRUNC_MAX_EXTENTS 2
+
+STATIC int xfs_iflush_int(struct xfs_inode *, struct xfs_buf *);
+STATIC int xfs_iunlink(struct xfs_trans *, struct xfs_inode *);
+STATIC int xfs_iunlink_remove(struct xfs_trans *, struct xfs_inode *);
+
+/*
+ * helper function to extract extent size hint from inode
+ */
+xfs_extlen_t
+xfs_get_extsz_hint(
+ struct xfs_inode *ip)
+{
+ if ((ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE) && ip->i_d.di_extsize)
+ return ip->i_d.di_extsize;
+ if (XFS_IS_REALTIME_INODE(ip))
+ return ip->i_mount->m_sb.sb_rextsize;
+ return 0;
+}
+
+/*
+ * Helper function to extract CoW extent size hint from inode.
+ * Between the extent size hint and the CoW extent size hint, we
+ * return the greater of the two. If the value is zero (automatic),
+ * use the default size.
+ */
+xfs_extlen_t
+xfs_get_cowextsz_hint(
+ struct xfs_inode *ip)
+{
+ xfs_extlen_t a, b;
+
+ a = 0;
+ if (ip->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE)
+ a = ip->i_d.di_cowextsize;
+ b = xfs_get_extsz_hint(ip);
+
+ a = max(a, b);
+ if (a == 0)
+ return XFS_DEFAULT_COWEXTSZ_HINT;
+ return a;
+}
+
+/*
+ * These two are wrapper routines around the xfs_ilock() routine used to
+ * centralize some grungy code. They are used in places that wish to lock the
+ * inode solely for reading the extents. The reason these places can't just
+ * call xfs_ilock(ip, XFS_ILOCK_SHARED) is that the inode lock also guards to
+ * bringing in of the extents from disk for a file in b-tree format. If the
+ * inode is in b-tree format, then we need to lock the inode exclusively until
+ * the extents are read in. Locking it exclusively all the time would limit
+ * our parallelism unnecessarily, though. What we do instead is check to see
+ * if the extents have been read in yet, and only lock the inode exclusively
+ * if they have not.
+ *
+ * The functions return a value which should be given to the corresponding
+ * xfs_iunlock() call.
+ */
+uint
+xfs_ilock_data_map_shared(
+ struct xfs_inode *ip)
+{
+ uint lock_mode = XFS_ILOCK_SHARED;
+
+ if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE &&
+ (ip->i_df.if_flags & XFS_IFEXTENTS) == 0)
+ lock_mode = XFS_ILOCK_EXCL;
+ xfs_ilock(ip, lock_mode);
+ return lock_mode;
+}
+
+uint
+xfs_ilock_attr_map_shared(
+ struct xfs_inode *ip)
+{
+ uint lock_mode = XFS_ILOCK_SHARED;
+
+ if (ip->i_d.di_aformat == XFS_DINODE_FMT_BTREE &&
+ (ip->i_afp->if_flags & XFS_IFEXTENTS) == 0)
+ lock_mode = XFS_ILOCK_EXCL;
+ xfs_ilock(ip, lock_mode);
+ return lock_mode;
+}
+
+/*
+ * In addition to i_rwsem in the VFS inode, the xfs inode contains 2
+ * multi-reader locks: i_mmap_lock and the i_lock. This routine allows
+ * various combinations of the locks to be obtained.
+ *
+ * The 3 locks should always be ordered so that the IO lock is obtained first,
+ * the mmap lock second and the ilock last in order to prevent deadlock.
+ *
+ * Basic locking order:
+ *
+ * i_rwsem -> i_mmap_lock -> page_lock -> i_ilock
+ *
+ * mmap_sem locking order:
+ *
+ * i_rwsem -> page lock -> mmap_sem
+ * mmap_sem -> i_mmap_lock -> page_lock
+ *
+ * The difference in mmap_sem locking order mean that we cannot hold the
+ * i_mmap_lock over syscall based read(2)/write(2) based IO. These IO paths can
+ * fault in pages during copy in/out (for buffered IO) or require the mmap_sem
+ * in get_user_pages() to map the user pages into the kernel address space for
+ * direct IO. Similarly the i_rwsem cannot be taken inside a page fault because
+ * page faults already hold the mmap_sem.
+ *
+ * Hence to serialise fully against both syscall and mmap based IO, we need to
+ * take both the i_rwsem and the i_mmap_lock. These locks should *only* be both
+ * taken in places where we need to invalidate the page cache in a race
+ * free manner (e.g. truncate, hole punch and other extent manipulation
+ * functions).
+ */
+void
+xfs_ilock(
+ xfs_inode_t *ip,
+ uint lock_flags)
+{
+ trace_xfs_ilock(ip, lock_flags, _RET_IP_);
+
+ /*
+ * You can't set both SHARED and EXCL for the same lock,
+ * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
+ * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
+ */
+ ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
+ (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
+ ASSERT((lock_flags & (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL)) !=
+ (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL));
+ ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
+ (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
+ ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_SUBCLASS_MASK)) == 0);
+
+ if (lock_flags & XFS_IOLOCK_EXCL) {
+ down_write_nested(&VFS_I(ip)->i_rwsem,
+ XFS_IOLOCK_DEP(lock_flags));
+ } else if (lock_flags & XFS_IOLOCK_SHARED) {
+ down_read_nested(&VFS_I(ip)->i_rwsem,
+ XFS_IOLOCK_DEP(lock_flags));
+ }
+
+ if (lock_flags & XFS_MMAPLOCK_EXCL)
+ mrupdate_nested(&ip->i_mmaplock, XFS_MMAPLOCK_DEP(lock_flags));
+ else if (lock_flags & XFS_MMAPLOCK_SHARED)
+ mraccess_nested(&ip->i_mmaplock, XFS_MMAPLOCK_DEP(lock_flags));
+
+ if (lock_flags & XFS_ILOCK_EXCL)
+ mrupdate_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
+ else if (lock_flags & XFS_ILOCK_SHARED)
+ mraccess_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
+}
+
+/*
+ * This is just like xfs_ilock(), except that the caller
+ * is guaranteed not to sleep. It returns 1 if it gets
+ * the requested locks and 0 otherwise. If the IO lock is
+ * obtained but the inode lock cannot be, then the IO lock
+ * is dropped before returning.
+ *
+ * ip -- the inode being locked
+ * lock_flags -- this parameter indicates the inode's locks to be
+ * to be locked. See the comment for xfs_ilock() for a list
+ * of valid values.
+ */
+int
+xfs_ilock_nowait(
+ xfs_inode_t *ip,
+ uint lock_flags)
+{
+ trace_xfs_ilock_nowait(ip, lock_flags, _RET_IP_);
+
+ /*
+ * You can't set both SHARED and EXCL for the same lock,
+ * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
+ * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
+ */
+ ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
+ (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
+ ASSERT((lock_flags & (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL)) !=
+ (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL));
+ ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
+ (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
+ ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_SUBCLASS_MASK)) == 0);
+
+ if (lock_flags & XFS_IOLOCK_EXCL) {
+ if (!down_write_trylock(&VFS_I(ip)->i_rwsem))
+ goto out;
+ } else if (lock_flags & XFS_IOLOCK_SHARED) {
+ if (!down_read_trylock(&VFS_I(ip)->i_rwsem))
+ goto out;
+ }
+
+ if (lock_flags & XFS_MMAPLOCK_EXCL) {
+ if (!mrtryupdate(&ip->i_mmaplock))
+ goto out_undo_iolock;
+ } else if (lock_flags & XFS_MMAPLOCK_SHARED) {
+ if (!mrtryaccess(&ip->i_mmaplock))
+ goto out_undo_iolock;
+ }
+
+ if (lock_flags & XFS_ILOCK_EXCL) {
+ if (!mrtryupdate(&ip->i_lock))
+ goto out_undo_mmaplock;
+ } else if (lock_flags & XFS_ILOCK_SHARED) {
+ if (!mrtryaccess(&ip->i_lock))
+ goto out_undo_mmaplock;
+ }
+ return 1;
+
+out_undo_mmaplock:
+ if (lock_flags & XFS_MMAPLOCK_EXCL)
+ mrunlock_excl(&ip->i_mmaplock);
+ else if (lock_flags & XFS_MMAPLOCK_SHARED)
+ mrunlock_shared(&ip->i_mmaplock);
+out_undo_iolock:
+ if (lock_flags & XFS_IOLOCK_EXCL)
+ up_write(&VFS_I(ip)->i_rwsem);
+ else if (lock_flags & XFS_IOLOCK_SHARED)
+ up_read(&VFS_I(ip)->i_rwsem);
+out:
+ return 0;
+}
+
+/*
+ * xfs_iunlock() is used to drop the inode locks acquired with
+ * xfs_ilock() and xfs_ilock_nowait(). The caller must pass
+ * in the flags given to xfs_ilock() or xfs_ilock_nowait() so
+ * that we know which locks to drop.
+ *
+ * ip -- the inode being unlocked
+ * lock_flags -- this parameter indicates the inode's locks to be
+ * to be unlocked. See the comment for xfs_ilock() for a list
+ * of valid values for this parameter.
+ *
+ */
+void
+xfs_iunlock(
+ xfs_inode_t *ip,
+ uint lock_flags)
+{
+ /*
+ * You can't set both SHARED and EXCL for the same lock,
+ * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
+ * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
+ */
+ ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
+ (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
+ ASSERT((lock_flags & (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL)) !=
+ (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL));
+ ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
+ (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
+ ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_SUBCLASS_MASK)) == 0);
+ ASSERT(lock_flags != 0);
+
+ if (lock_flags & XFS_IOLOCK_EXCL)
+ up_write(&VFS_I(ip)->i_rwsem);
+ else if (lock_flags & XFS_IOLOCK_SHARED)
+ up_read(&VFS_I(ip)->i_rwsem);
+
+ if (lock_flags & XFS_MMAPLOCK_EXCL)
+ mrunlock_excl(&ip->i_mmaplock);
+ else if (lock_flags & XFS_MMAPLOCK_SHARED)
+ mrunlock_shared(&ip->i_mmaplock);
+
+ if (lock_flags & XFS_ILOCK_EXCL)
+ mrunlock_excl(&ip->i_lock);
+ else if (lock_flags & XFS_ILOCK_SHARED)
+ mrunlock_shared(&ip->i_lock);
+
+ trace_xfs_iunlock(ip, lock_flags, _RET_IP_);
+}
+
+/*
+ * give up write locks. the i/o lock cannot be held nested
+ * if it is being demoted.
+ */
+void
+xfs_ilock_demote(
+ xfs_inode_t *ip,
+ uint lock_flags)
+{
+ ASSERT(lock_flags & (XFS_IOLOCK_EXCL|XFS_MMAPLOCK_EXCL|XFS_ILOCK_EXCL));
+ ASSERT((lock_flags &
+ ~(XFS_IOLOCK_EXCL|XFS_MMAPLOCK_EXCL|XFS_ILOCK_EXCL)) == 0);
+
+ if (lock_flags & XFS_ILOCK_EXCL)
+ mrdemote(&ip->i_lock);
+ if (lock_flags & XFS_MMAPLOCK_EXCL)
+ mrdemote(&ip->i_mmaplock);
+ if (lock_flags & XFS_IOLOCK_EXCL)
+ downgrade_write(&VFS_I(ip)->i_rwsem);
+
+ trace_xfs_ilock_demote(ip, lock_flags, _RET_IP_);
+}
+
+#if defined(DEBUG) || defined(XFS_WARN)
+int
+xfs_isilocked(
+ xfs_inode_t *ip,
+ uint lock_flags)
+{
+ if (lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) {
+ if (!(lock_flags & XFS_ILOCK_SHARED))
+ return !!ip->i_lock.mr_writer;
+ return rwsem_is_locked(&ip->i_lock.mr_lock);
+ }
+
+ if (lock_flags & (XFS_MMAPLOCK_EXCL|XFS_MMAPLOCK_SHARED)) {
+ if (!(lock_flags & XFS_MMAPLOCK_SHARED))
+ return !!ip->i_mmaplock.mr_writer;
+ return rwsem_is_locked(&ip->i_mmaplock.mr_lock);
+ }
+
+ if (lock_flags & (XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) {
+ if (!(lock_flags & XFS_IOLOCK_SHARED))
+ return !debug_locks ||
+ lockdep_is_held_type(&VFS_I(ip)->i_rwsem, 0);
+ return rwsem_is_locked(&VFS_I(ip)->i_rwsem);
+ }
+
+ ASSERT(0);
+ return 0;
+}
+#endif
+
+/*
+ * xfs_lockdep_subclass_ok() is only used in an ASSERT, so is only called when
+ * DEBUG or XFS_WARN is set. And MAX_LOCKDEP_SUBCLASSES is then only defined
+ * when CONFIG_LOCKDEP is set. Hence the complex define below to avoid build
+ * errors and warnings.
+ */
+#if (defined(DEBUG) || defined(XFS_WARN)) && defined(CONFIG_LOCKDEP)
+static bool
+xfs_lockdep_subclass_ok(
+ int subclass)
+{
+ return subclass < MAX_LOCKDEP_SUBCLASSES;
+}
+#else
+#define xfs_lockdep_subclass_ok(subclass) (true)
+#endif
+
+/*
+ * Bump the subclass so xfs_lock_inodes() acquires each lock with a different
+ * value. This can be called for any type of inode lock combination, including
+ * parent locking. Care must be taken to ensure we don't overrun the subclass
+ * storage fields in the class mask we build.
+ */
+static inline int
+xfs_lock_inumorder(int lock_mode, int subclass)
+{
+ int class = 0;
+
+ ASSERT(!(lock_mode & (XFS_ILOCK_PARENT | XFS_ILOCK_RTBITMAP |
+ XFS_ILOCK_RTSUM)));
+ ASSERT(xfs_lockdep_subclass_ok(subclass));
+
+ if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)) {
+ ASSERT(subclass <= XFS_IOLOCK_MAX_SUBCLASS);
+ class += subclass << XFS_IOLOCK_SHIFT;
+ }
+
+ if (lock_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) {
+ ASSERT(subclass <= XFS_MMAPLOCK_MAX_SUBCLASS);
+ class += subclass << XFS_MMAPLOCK_SHIFT;
+ }
+
+ if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) {
+ ASSERT(subclass <= XFS_ILOCK_MAX_SUBCLASS);
+ class += subclass << XFS_ILOCK_SHIFT;
+ }
+
+ return (lock_mode & ~XFS_LOCK_SUBCLASS_MASK) | class;
+}
+
+/*
+ * The following routine will lock n inodes in exclusive mode. We assume the
+ * caller calls us with the inodes in i_ino order.
+ *
+ * We need to detect deadlock where an inode that we lock is in the AIL and we
+ * start waiting for another inode that is locked by a thread in a long running
+ * transaction (such as truncate). This can result in deadlock since the long
+ * running trans might need to wait for the inode we just locked in order to
+ * push the tail and free space in the log.
+ *
+ * xfs_lock_inodes() can only be used to lock one type of lock at a time -
+ * the iolock, the mmaplock or the ilock, but not more than one at a time. If we
+ * lock more than one at a time, lockdep will report false positives saying we
+ * have violated locking orders.
+ */
+static void
+xfs_lock_inodes(
+ xfs_inode_t **ips,
+ int inodes,
+ uint lock_mode)
+{
+ int attempts = 0, i, j, try_lock;
+ xfs_log_item_t *lp;
+
+ /*
+ * Currently supports between 2 and 5 inodes with exclusive locking. We
+ * support an arbitrary depth of locking here, but absolute limits on
+ * inodes depend on the the type of locking and the limits placed by
+ * lockdep annotations in xfs_lock_inumorder. These are all checked by
+ * the asserts.
+ */
+ ASSERT(ips && inodes >= 2 && inodes <= 5);
+ ASSERT(lock_mode & (XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL |
+ XFS_ILOCK_EXCL));
+ ASSERT(!(lock_mode & (XFS_IOLOCK_SHARED | XFS_MMAPLOCK_SHARED |
+ XFS_ILOCK_SHARED)));
+ ASSERT(!(lock_mode & XFS_MMAPLOCK_EXCL) ||
+ inodes <= XFS_MMAPLOCK_MAX_SUBCLASS + 1);
+ ASSERT(!(lock_mode & XFS_ILOCK_EXCL) ||
+ inodes <= XFS_ILOCK_MAX_SUBCLASS + 1);
+
+ if (lock_mode & XFS_IOLOCK_EXCL) {
+ ASSERT(!(lock_mode & (XFS_MMAPLOCK_EXCL | XFS_ILOCK_EXCL)));
+ } else if (lock_mode & XFS_MMAPLOCK_EXCL)
+ ASSERT(!(lock_mode & XFS_ILOCK_EXCL));
+
+ try_lock = 0;
+ i = 0;
+again:
+ for (; i < inodes; i++) {
+ ASSERT(ips[i]);
+
+ if (i && (ips[i] == ips[i - 1])) /* Already locked */
+ continue;
+
+ /*
+ * If try_lock is not set yet, make sure all locked inodes are
+ * not in the AIL. If any are, set try_lock to be used later.
+ */
+ if (!try_lock) {
+ for (j = (i - 1); j >= 0 && !try_lock; j--) {
+ lp = (xfs_log_item_t *)ips[j]->i_itemp;
+ if (lp && test_bit(XFS_LI_IN_AIL, &lp->li_flags))
+ try_lock++;
+ }
+ }
+
+ /*
+ * If any of the previous locks we have locked is in the AIL,
+ * we must TRY to get the second and subsequent locks. If
+ * we can't get any, we must release all we have
+ * and try again.
+ */
+ if (!try_lock) {
+ xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i));
+ continue;
+ }
+
+ /* try_lock means we have an inode locked that is in the AIL. */
+ ASSERT(i != 0);
+ if (xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i)))
+ continue;
+
+ /*
+ * Unlock all previous guys and try again. xfs_iunlock will try
+ * to push the tail if the inode is in the AIL.
+ */
+ attempts++;
+ for (j = i - 1; j >= 0; j--) {
+ /*
+ * Check to see if we've already unlocked this one. Not
+ * the first one going back, and the inode ptr is the
+ * same.
+ */
+ if (j != (i - 1) && ips[j] == ips[j + 1])
+ continue;
+
+ xfs_iunlock(ips[j], lock_mode);
+ }
+
+ if ((attempts % 5) == 0) {
+ delay(1); /* Don't just spin the CPU */
+ }
+ i = 0;
+ try_lock = 0;
+ goto again;
+ }
+}
+
+/*
+ * xfs_lock_two_inodes() can only be used to lock one type of lock at a time -
+ * the mmaplock or the ilock, but not more than one type at a time. If we lock
+ * more than one at a time, lockdep will report false positives saying we have
+ * violated locking orders. The iolock must be double-locked separately since
+ * we use i_rwsem for that. We now support taking one lock EXCL and the other
+ * SHARED.
+ */
+void
+xfs_lock_two_inodes(
+ struct xfs_inode *ip0,
+ uint ip0_mode,
+ struct xfs_inode *ip1,
+ uint ip1_mode)
+{
+ struct xfs_inode *temp;
+ uint mode_temp;
+ int attempts = 0;
+ xfs_log_item_t *lp;
+
+ ASSERT(hweight32(ip0_mode) == 1);
+ ASSERT(hweight32(ip1_mode) == 1);
+ ASSERT(!(ip0_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)));
+ ASSERT(!(ip1_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)));
+ ASSERT(!(ip0_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) ||
+ !(ip0_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)));
+ ASSERT(!(ip1_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) ||
+ !(ip1_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)));
+ ASSERT(!(ip1_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) ||
+ !(ip0_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)));
+ ASSERT(!(ip0_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) ||
+ !(ip1_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)));
+
+ ASSERT(ip0->i_ino != ip1->i_ino);
+
+ if (ip0->i_ino > ip1->i_ino) {
+ temp = ip0;
+ ip0 = ip1;
+ ip1 = temp;
+ mode_temp = ip0_mode;
+ ip0_mode = ip1_mode;
+ ip1_mode = mode_temp;
+ }
+
+ again:
+ xfs_ilock(ip0, xfs_lock_inumorder(ip0_mode, 0));
+
+ /*
+ * If the first lock we have locked is in the AIL, we must TRY to get
+ * the second lock. If we can't get it, we must release the first one
+ * and try again.
+ */
+ lp = (xfs_log_item_t *)ip0->i_itemp;
+ if (lp && test_bit(XFS_LI_IN_AIL, &lp->li_flags)) {
+ if (!xfs_ilock_nowait(ip1, xfs_lock_inumorder(ip1_mode, 1))) {
+ xfs_iunlock(ip0, ip0_mode);
+ if ((++attempts % 5) == 0)
+ delay(1); /* Don't just spin the CPU */
+ goto again;
+ }
+ } else {
+ xfs_ilock(ip1, xfs_lock_inumorder(ip1_mode, 1));
+ }
+}
+
+void
+__xfs_iflock(
+ struct xfs_inode *ip)
+{
+ wait_queue_head_t *wq = bit_waitqueue(&ip->i_flags, __XFS_IFLOCK_BIT);
+ DEFINE_WAIT_BIT(wait, &ip->i_flags, __XFS_IFLOCK_BIT);
+
+ do {
+ prepare_to_wait_exclusive(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE);
+ if (xfs_isiflocked(ip))
+ io_schedule();
+ } while (!xfs_iflock_nowait(ip));
+
+ finish_wait(wq, &wait.wq_entry);
+}
+
+STATIC uint
+_xfs_dic2xflags(
+ uint16_t di_flags,
+ uint64_t di_flags2,
+ bool has_attr)
+{
+ uint flags = 0;
+
+ if (di_flags & XFS_DIFLAG_ANY) {
+ if (di_flags & XFS_DIFLAG_REALTIME)
+ flags |= FS_XFLAG_REALTIME;
+ if (di_flags & XFS_DIFLAG_PREALLOC)
+ flags |= FS_XFLAG_PREALLOC;
+ if (di_flags & XFS_DIFLAG_IMMUTABLE)
+ flags |= FS_XFLAG_IMMUTABLE;
+ if (di_flags & XFS_DIFLAG_APPEND)
+ flags |= FS_XFLAG_APPEND;
+ if (di_flags & XFS_DIFLAG_SYNC)
+ flags |= FS_XFLAG_SYNC;
+ if (di_flags & XFS_DIFLAG_NOATIME)
+ flags |= FS_XFLAG_NOATIME;
+ if (di_flags & XFS_DIFLAG_NODUMP)
+ flags |= FS_XFLAG_NODUMP;
+ if (di_flags & XFS_DIFLAG_RTINHERIT)
+ flags |= FS_XFLAG_RTINHERIT;
+ if (di_flags & XFS_DIFLAG_PROJINHERIT)
+ flags |= FS_XFLAG_PROJINHERIT;
+ if (di_flags & XFS_DIFLAG_NOSYMLINKS)
+ flags |= FS_XFLAG_NOSYMLINKS;
+ if (di_flags & XFS_DIFLAG_EXTSIZE)
+ flags |= FS_XFLAG_EXTSIZE;
+ if (di_flags & XFS_DIFLAG_EXTSZINHERIT)
+ flags |= FS_XFLAG_EXTSZINHERIT;
+ if (di_flags & XFS_DIFLAG_NODEFRAG)
+ flags |= FS_XFLAG_NODEFRAG;
+ if (di_flags & XFS_DIFLAG_FILESTREAM)
+ flags |= FS_XFLAG_FILESTREAM;
+ }
+
+ if (di_flags2 & XFS_DIFLAG2_ANY) {
+ if (di_flags2 & XFS_DIFLAG2_DAX)
+ flags |= FS_XFLAG_DAX;
+ if (di_flags2 & XFS_DIFLAG2_COWEXTSIZE)
+ flags |= FS_XFLAG_COWEXTSIZE;
+ }
+
+ if (has_attr)
+ flags |= FS_XFLAG_HASATTR;
+
+ return flags;
+}
+
+uint
+xfs_ip2xflags(
+ struct xfs_inode *ip)
+{
+ struct xfs_icdinode *dic = &ip->i_d;
+
+ return _xfs_dic2xflags(dic->di_flags, dic->di_flags2, XFS_IFORK_Q(ip));
+}
+
+/*
+ * Lookups up an inode from "name". If ci_name is not NULL, then a CI match
+ * is allowed, otherwise it has to be an exact match. If a CI match is found,
+ * ci_name->name will point to a the actual name (caller must free) or
+ * will be set to NULL if an exact match is found.
+ */
+int
+xfs_lookup(
+ xfs_inode_t *dp,
+ struct xfs_name *name,
+ xfs_inode_t **ipp,
+ struct xfs_name *ci_name)
+{
+ xfs_ino_t inum;
+ int error;
+
+ trace_xfs_lookup(dp, name);
+
+ if (XFS_FORCED_SHUTDOWN(dp->i_mount))
+ return -EIO;
+
+ error = xfs_dir_lookup(NULL, dp, name, &inum, ci_name);
+ if (error)
+ goto out_unlock;
+
+ error = xfs_iget(dp->i_mount, NULL, inum, 0, 0, ipp);
+ if (error)
+ goto out_free_name;
+
+ return 0;
+
+out_free_name:
+ if (ci_name)
+ kmem_free(ci_name->name);
+out_unlock:
+ *ipp = NULL;
+ return error;
+}
+
+/*
+ * Allocate an inode on disk and return a copy of its in-core version.
+ * The in-core inode is locked exclusively. Set mode, nlink, and rdev
+ * appropriately within the inode. The uid and gid for the inode are
+ * set according to the contents of the given cred structure.
+ *
+ * Use xfs_dialloc() to allocate the on-disk inode. If xfs_dialloc()
+ * has a free inode available, call xfs_iget() to obtain the in-core
+ * version of the allocated inode. Finally, fill in the inode and
+ * log its initial contents. In this case, ialloc_context would be
+ * set to NULL.
+ *
+ * If xfs_dialloc() does not have an available inode, it will replenish
+ * its supply by doing an allocation. Since we can only do one
+ * allocation within a transaction without deadlocks, we must commit
+ * the current transaction before returning the inode itself.
+ * In this case, therefore, we will set ialloc_context and return.
+ * The caller should then commit the current transaction, start a new
+ * transaction, and call xfs_ialloc() again to actually get the inode.
+ *
+ * To ensure that some other process does not grab the inode that
+ * was allocated during the first call to xfs_ialloc(), this routine
+ * also returns the [locked] bp pointing to the head of the freelist
+ * as ialloc_context. The caller should hold this buffer across
+ * the commit and pass it back into this routine on the second call.
+ *
+ * If we are allocating quota inodes, we do not have a parent inode
+ * to attach to or associate with (i.e. pip == NULL) because they
+ * are not linked into the directory structure - they are attached
+ * directly to the superblock - and so have no parent.
+ */
+static int
+xfs_ialloc(
+ xfs_trans_t *tp,
+ xfs_inode_t *pip,
+ umode_t mode,
+ xfs_nlink_t nlink,
+ dev_t rdev,
+ prid_t prid,
+ xfs_buf_t **ialloc_context,
+ xfs_inode_t **ipp)
+{
+ struct xfs_mount *mp = tp->t_mountp;
+ xfs_ino_t ino;
+ xfs_inode_t *ip;
+ uint flags;
+ int error;
+ struct timespec64 tv;
+ struct inode *inode;
+
+ /*
+ * Call the space management code to pick
+ * the on-disk inode to be allocated.
+ */
+ error = xfs_dialloc(tp, pip ? pip->i_ino : 0, mode,
+ ialloc_context, &ino);
+ if (error)
+ return error;
+ if (*ialloc_context || ino == NULLFSINO) {
+ *ipp = NULL;
+ return 0;
+ }
+ ASSERT(*ialloc_context == NULL);
+
+ /*
+ * Protect against obviously corrupt allocation btree records. Later
+ * xfs_iget checks will catch re-allocation of other active in-memory
+ * and on-disk inodes. If we don't catch reallocating the parent inode
+ * here we will deadlock in xfs_iget() so we have to do these checks
+ * first.
+ */
+ if ((pip && ino == pip->i_ino) || !xfs_verify_dir_ino(mp, ino)) {
+ xfs_alert(mp, "Allocated a known in-use inode 0x%llx!", ino);
+ return -EFSCORRUPTED;
+ }
+
+ /*
+ * Get the in-core inode with the lock held exclusively.
+ * This is because we're setting fields here we need
+ * to prevent others from looking at until we're done.
+ */
+ error = xfs_iget(mp, tp, ino, XFS_IGET_CREATE,
+ XFS_ILOCK_EXCL, &ip);
+ if (error)
+ return error;
+ ASSERT(ip != NULL);
+ inode = VFS_I(ip);
+
+ /*
+ * We always convert v1 inodes to v2 now - we only support filesystems
+ * with >= v2 inode capability, so there is no reason for ever leaving
+ * an inode in v1 format.
+ */
+ if (ip->i_d.di_version == 1)
+ ip->i_d.di_version = 2;
+
+ inode->i_mode = mode;
+ set_nlink(inode, nlink);
+ ip->i_d.di_uid = xfs_kuid_to_uid(current_fsuid());
+ ip->i_d.di_gid = xfs_kgid_to_gid(current_fsgid());
+ inode->i_rdev = rdev;
+ xfs_set_projid(ip, prid);
+
+ if (pip && XFS_INHERIT_GID(pip)) {
+ ip->i_d.di_gid = pip->i_d.di_gid;
+ if ((VFS_I(pip)->i_mode & S_ISGID) && S_ISDIR(mode))
+ inode->i_mode |= S_ISGID;
+ }
+
+ /*
+ * If the group ID of the new file does not match the effective group
+ * ID or one of the supplementary group IDs, the S_ISGID bit is cleared
+ * (and only if the irix_sgid_inherit compatibility variable is set).
+ */
+ if ((irix_sgid_inherit) &&
+ (inode->i_mode & S_ISGID) &&
+ (!in_group_p(xfs_gid_to_kgid(ip->i_d.di_gid))))
+ inode->i_mode &= ~S_ISGID;
+
+ ip->i_d.di_size = 0;
+ ip->i_d.di_nextents = 0;
+ ASSERT(ip->i_d.di_nblocks == 0);
+
+ tv = current_time(inode);
+ inode->i_mtime = tv;
+ inode->i_atime = tv;
+ inode->i_ctime = tv;
+
+ ip->i_d.di_extsize = 0;
+ ip->i_d.di_dmevmask = 0;
+ ip->i_d.di_dmstate = 0;
+ ip->i_d.di_flags = 0;
+
+ if (ip->i_d.di_version == 3) {
+ inode_set_iversion(inode, 1);
+ ip->i_d.di_flags2 = 0;
+ ip->i_d.di_cowextsize = 0;
+ ip->i_d.di_crtime.t_sec = (int32_t)tv.tv_sec;
+ ip->i_d.di_crtime.t_nsec = (int32_t)tv.tv_nsec;
+ }
+
+
+ flags = XFS_ILOG_CORE;
+ switch (mode & S_IFMT) {
+ case S_IFIFO:
+ case S_IFCHR:
+ case S_IFBLK:
+ case S_IFSOCK:
+ ip->i_d.di_format = XFS_DINODE_FMT_DEV;
+ ip->i_df.if_flags = 0;
+ flags |= XFS_ILOG_DEV;
+ break;
+ case S_IFREG:
+ case S_IFDIR:
+ if (pip && (pip->i_d.di_flags & XFS_DIFLAG_ANY)) {
+ uint di_flags = 0;
+
+ if (S_ISDIR(mode)) {
+ if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT)
+ di_flags |= XFS_DIFLAG_RTINHERIT;
+ if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) {
+ di_flags |= XFS_DIFLAG_EXTSZINHERIT;
+ ip->i_d.di_extsize = pip->i_d.di_extsize;
+ }
+ if (pip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
+ di_flags |= XFS_DIFLAG_PROJINHERIT;
+ } else if (S_ISREG(mode)) {
+ if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT)
+ di_flags |= XFS_DIFLAG_REALTIME;
+ if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) {
+ di_flags |= XFS_DIFLAG_EXTSIZE;
+ ip->i_d.di_extsize = pip->i_d.di_extsize;
+ }
+ }
+ if ((pip->i_d.di_flags & XFS_DIFLAG_NOATIME) &&
+ xfs_inherit_noatime)
+ di_flags |= XFS_DIFLAG_NOATIME;
+ if ((pip->i_d.di_flags & XFS_DIFLAG_NODUMP) &&
+ xfs_inherit_nodump)
+ di_flags |= XFS_DIFLAG_NODUMP;
+ if ((pip->i_d.di_flags & XFS_DIFLAG_SYNC) &&
+ xfs_inherit_sync)
+ di_flags |= XFS_DIFLAG_SYNC;
+ if ((pip->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) &&
+ xfs_inherit_nosymlinks)
+ di_flags |= XFS_DIFLAG_NOSYMLINKS;
+ if ((pip->i_d.di_flags & XFS_DIFLAG_NODEFRAG) &&
+ xfs_inherit_nodefrag)
+ di_flags |= XFS_DIFLAG_NODEFRAG;
+ if (pip->i_d.di_flags & XFS_DIFLAG_FILESTREAM)
+ di_flags |= XFS_DIFLAG_FILESTREAM;
+
+ ip->i_d.di_flags |= di_flags;
+ }
+ if (pip &&
+ (pip->i_d.di_flags2 & XFS_DIFLAG2_ANY) &&
+ pip->i_d.di_version == 3 &&
+ ip->i_d.di_version == 3) {
+ uint64_t di_flags2 = 0;
+
+ if (pip->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE) {
+ di_flags2 |= XFS_DIFLAG2_COWEXTSIZE;
+ ip->i_d.di_cowextsize = pip->i_d.di_cowextsize;
+ }
+ if (pip->i_d.di_flags2 & XFS_DIFLAG2_DAX)
+ di_flags2 |= XFS_DIFLAG2_DAX;
+
+ ip->i_d.di_flags2 |= di_flags2;
+ }
+ /* FALLTHROUGH */
+ case S_IFLNK:
+ ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS;
+ ip->i_df.if_flags = XFS_IFEXTENTS;
+ ip->i_df.if_bytes = 0;
+ ip->i_df.if_u1.if_root = NULL;
+ break;
+ default:
+ ASSERT(0);
+ }
+ /*
+ * Attribute fork settings for new inode.
+ */
+ ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
+ ip->i_d.di_anextents = 0;
+
+ /*
+ * Log the new values stuffed into the inode.
+ */
+ xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+ xfs_trans_log_inode(tp, ip, flags);
+
+ /* now that we have an i_mode we can setup the inode structure */
+ xfs_setup_inode(ip);
+
+ *ipp = ip;
+ return 0;
+}
+
+/*
+ * Allocates a new inode from disk and return a pointer to the
+ * incore copy. This routine will internally commit the current
+ * transaction and allocate a new one if the Space Manager needed
+ * to do an allocation to replenish the inode free-list.
+ *
+ * This routine is designed to be called from xfs_create and
+ * xfs_create_dir.
+ *
+ */
+int
+xfs_dir_ialloc(
+ xfs_trans_t **tpp, /* input: current transaction;
+ output: may be a new transaction. */
+ xfs_inode_t *dp, /* directory within whose allocate
+ the inode. */
+ umode_t mode,
+ xfs_nlink_t nlink,
+ dev_t rdev,
+ prid_t prid, /* project id */
+ xfs_inode_t **ipp) /* pointer to inode; it will be
+ locked. */
+{
+ xfs_trans_t *tp;
+ xfs_inode_t *ip;
+ xfs_buf_t *ialloc_context = NULL;
+ int code;
+ void *dqinfo;
+ uint tflags;
+
+ tp = *tpp;
+ ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
+
+ /*
+ * xfs_ialloc will return a pointer to an incore inode if
+ * the Space Manager has an available inode on the free
+ * list. Otherwise, it will do an allocation and replenish
+ * the freelist. Since we can only do one allocation per
+ * transaction without deadlocks, we will need to commit the
+ * current transaction and start a new one. We will then
+ * need to call xfs_ialloc again to get the inode.
+ *
+ * If xfs_ialloc did an allocation to replenish the freelist,
+ * it returns the bp containing the head of the freelist as
+ * ialloc_context. We will hold a lock on it across the
+ * transaction commit so that no other process can steal
+ * the inode(s) that we've just allocated.
+ */
+ code = xfs_ialloc(tp, dp, mode, nlink, rdev, prid, &ialloc_context,
+ &ip);
+
+ /*
+ * Return an error if we were unable to allocate a new inode.
+ * This should only happen if we run out of space on disk or
+ * encounter a disk error.
+ */
+ if (code) {
+ *ipp = NULL;
+ return code;
+ }
+ if (!ialloc_context && !ip) {
+ *ipp = NULL;
+ return -ENOSPC;
+ }
+
+ /*
+ * If the AGI buffer is non-NULL, then we were unable to get an
+ * inode in one operation. We need to commit the current
+ * transaction and call xfs_ialloc() again. It is guaranteed
+ * to succeed the second time.
+ */
+ if (ialloc_context) {
+ /*
+ * Normally, xfs_trans_commit releases all the locks.
+ * We call bhold to hang on to the ialloc_context across
+ * the commit. Holding this buffer prevents any other
+ * processes from doing any allocations in this
+ * allocation group.
+ */
+ xfs_trans_bhold(tp, ialloc_context);
+
+ /*
+ * We want the quota changes to be associated with the next
+ * transaction, NOT this one. So, detach the dqinfo from this
+ * and attach it to the next transaction.
+ */
+ dqinfo = NULL;
+ tflags = 0;
+ if (tp->t_dqinfo) {
+ dqinfo = (void *)tp->t_dqinfo;
+ tp->t_dqinfo = NULL;
+ tflags = tp->t_flags & XFS_TRANS_DQ_DIRTY;
+ tp->t_flags &= ~(XFS_TRANS_DQ_DIRTY);
+ }
+
+ code = xfs_trans_roll(&tp);
+
+ /*
+ * Re-attach the quota info that we detached from prev trx.
+ */
+ if (dqinfo) {
+ tp->t_dqinfo = dqinfo;
+ tp->t_flags |= tflags;
+ }
+
+ if (code) {
+ xfs_buf_relse(ialloc_context);
+ *tpp = tp;
+ *ipp = NULL;
+ return code;
+ }
+ xfs_trans_bjoin(tp, ialloc_context);
+
+ /*
+ * Call ialloc again. Since we've locked out all
+ * other allocations in this allocation group,
+ * this call should always succeed.
+ */
+ code = xfs_ialloc(tp, dp, mode, nlink, rdev, prid,
+ &ialloc_context, &ip);
+
+ /*
+ * If we get an error at this point, return to the caller
+ * so that the current transaction can be aborted.
+ */
+ if (code) {
+ *tpp = tp;
+ *ipp = NULL;
+ return code;
+ }
+ ASSERT(!ialloc_context && ip);
+
+ }
+
+ *ipp = ip;
+ *tpp = tp;
+
+ return 0;
+}
+
+/*
+ * Decrement the link count on an inode & log the change. If this causes the
+ * link count to go to zero, move the inode to AGI unlinked list so that it can
+ * be freed when the last active reference goes away via xfs_inactive().
+ */
+static int /* error */
+xfs_droplink(
+ xfs_trans_t *tp,
+ xfs_inode_t *ip)
+{
+ xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);
+
+ drop_nlink(VFS_I(ip));
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+
+ if (VFS_I(ip)->i_nlink)
+ return 0;
+
+ return xfs_iunlink(tp, ip);
+}
+
+/*
+ * Increment the link count on an inode & log the change.
+ */
+static int
+xfs_bumplink(
+ xfs_trans_t *tp,
+ xfs_inode_t *ip)
+{
+ xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);
+
+ ASSERT(ip->i_d.di_version > 1);
+ inc_nlink(VFS_I(ip));
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+ return 0;
+}
+
+int
+xfs_create(
+ xfs_inode_t *dp,
+ struct xfs_name *name,
+ umode_t mode,
+ dev_t rdev,
+ xfs_inode_t **ipp)
+{
+ int is_dir = S_ISDIR(mode);
+ struct xfs_mount *mp = dp->i_mount;
+ struct xfs_inode *ip = NULL;
+ struct xfs_trans *tp = NULL;
+ int error;
+ bool unlock_dp_on_error = false;
+ prid_t prid;
+ struct xfs_dquot *udqp = NULL;
+ struct xfs_dquot *gdqp = NULL;
+ struct xfs_dquot *pdqp = NULL;
+ struct xfs_trans_res *tres;
+ uint resblks;
+
+ trace_xfs_create(dp, name);
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return -EIO;
+
+ prid = xfs_get_initial_prid(dp);
+
+ /*
+ * Make sure that we have allocated dquot(s) on disk.
+ */
+ error = xfs_qm_vop_dqalloc(dp, xfs_kuid_to_uid(current_fsuid()),
+ xfs_kgid_to_gid(current_fsgid()), prid,
+ XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
+ &udqp, &gdqp, &pdqp);
+ if (error)
+ return error;
+
+ if (is_dir) {
+ resblks = XFS_MKDIR_SPACE_RES(mp, name->len);
+ tres = &M_RES(mp)->tr_mkdir;
+ } else {
+ resblks = XFS_CREATE_SPACE_RES(mp, name->len);
+ tres = &M_RES(mp)->tr_create;
+ }
+
+ /*
+ * Initially assume that the file does not exist and
+ * reserve the resources for that case. If that is not
+ * the case we'll drop the one we have and get a more
+ * appropriate transaction later.
+ */
+ error = xfs_trans_alloc(mp, tres, resblks, 0, 0, &tp);
+ if (error == -ENOSPC) {
+ /* flush outstanding delalloc blocks and retry */
+ xfs_flush_inodes(mp);
+ error = xfs_trans_alloc(mp, tres, resblks, 0, 0, &tp);
+ }
+ if (error)
+ goto out_release_inode;
+
+ xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
+ unlock_dp_on_error = true;
+
+ /*
+ * Reserve disk quota and the inode.
+ */
+ error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp,
+ pdqp, resblks, 1, 0);
+ if (error)
+ goto out_trans_cancel;
+
+ /*
+ * A newly created regular or special file just has one directory
+ * entry pointing to them, but a directory also the "." entry
+ * pointing to itself.
+ */
+ error = xfs_dir_ialloc(&tp, dp, mode, is_dir ? 2 : 1, rdev, prid, &ip);
+ if (error)
+ goto out_trans_cancel;
+
+ /*
+ * Now we join the directory inode to the transaction. We do not do it
+ * earlier because xfs_dir_ialloc might commit the previous transaction
+ * (and release all the locks). An error from here on will result in
+ * the transaction cancel unlocking dp so don't do it explicitly in the
+ * error path.
+ */
+ xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
+ unlock_dp_on_error = false;
+
+ error = xfs_dir_createname(tp, dp, name, ip->i_ino,
+ resblks ?
+ resblks - XFS_IALLOC_SPACE_RES(mp) : 0);
+ if (error) {
+ ASSERT(error != -ENOSPC);
+ goto out_trans_cancel;
+ }
+ xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
+ xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
+
+ if (is_dir) {
+ error = xfs_dir_init(tp, ip, dp);
+ if (error)
+ goto out_trans_cancel;
+
+ error = xfs_bumplink(tp, dp);
+ if (error)
+ goto out_trans_cancel;
+ }
+
+ /*
+ * If this is a synchronous mount, make sure that the
+ * create transaction goes to disk before returning to
+ * the user.
+ */
+ if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
+ xfs_trans_set_sync(tp);
+
+ /*
+ * Attach the dquot(s) to the inodes and modify them incore.
+ * These ids of the inode couldn't have changed since the new
+ * inode has been locked ever since it was created.
+ */
+ xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);
+
+ error = xfs_trans_commit(tp);
+ if (error)
+ goto out_release_inode;
+
+ xfs_qm_dqrele(udqp);
+ xfs_qm_dqrele(gdqp);
+ xfs_qm_dqrele(pdqp);
+
+ *ipp = ip;
+ return 0;
+
+ out_trans_cancel:
+ xfs_trans_cancel(tp);
+ out_release_inode:
+ /*
+ * Wait until after the current transaction is aborted to finish the
+ * setup of the inode and release the inode. This prevents recursive
+ * transactions and deadlocks from xfs_inactive.
+ */
+ if (ip) {
+ xfs_finish_inode_setup(ip);
+ xfs_irele(ip);
+ }
+
+ xfs_qm_dqrele(udqp);
+ xfs_qm_dqrele(gdqp);
+ xfs_qm_dqrele(pdqp);
+
+ if (unlock_dp_on_error)
+ xfs_iunlock(dp, XFS_ILOCK_EXCL);
+ return error;
+}
+
+int
+xfs_create_tmpfile(
+ struct xfs_inode *dp,
+ umode_t mode,
+ struct xfs_inode **ipp)
+{
+ struct xfs_mount *mp = dp->i_mount;
+ struct xfs_inode *ip = NULL;
+ struct xfs_trans *tp = NULL;
+ int error;
+ prid_t prid;
+ struct xfs_dquot *udqp = NULL;
+ struct xfs_dquot *gdqp = NULL;
+ struct xfs_dquot *pdqp = NULL;
+ struct xfs_trans_res *tres;
+ uint resblks;
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return -EIO;
+
+ prid = xfs_get_initial_prid(dp);
+
+ /*
+ * Make sure that we have allocated dquot(s) on disk.
+ */
+ error = xfs_qm_vop_dqalloc(dp, xfs_kuid_to_uid(current_fsuid()),
+ xfs_kgid_to_gid(current_fsgid()), prid,
+ XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
+ &udqp, &gdqp, &pdqp);
+ if (error)
+ return error;
+
+ resblks = XFS_IALLOC_SPACE_RES(mp);
+ tres = &M_RES(mp)->tr_create_tmpfile;
+
+ error = xfs_trans_alloc(mp, tres, resblks, 0, 0, &tp);
+ if (error)
+ goto out_release_inode;
+
+ error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp,
+ pdqp, resblks, 1, 0);
+ if (error)
+ goto out_trans_cancel;
+
+ error = xfs_dir_ialloc(&tp, dp, mode, 1, 0, prid, &ip);
+ if (error)
+ goto out_trans_cancel;
+
+ if (mp->m_flags & XFS_MOUNT_WSYNC)
+ xfs_trans_set_sync(tp);
+
+ /*
+ * Attach the dquot(s) to the inodes and modify them incore.
+ * These ids of the inode couldn't have changed since the new
+ * inode has been locked ever since it was created.
+ */
+ xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);
+
+ error = xfs_iunlink(tp, ip);
+ if (error)
+ goto out_trans_cancel;
+
+ error = xfs_trans_commit(tp);
+ if (error)
+ goto out_release_inode;
+
+ xfs_qm_dqrele(udqp);
+ xfs_qm_dqrele(gdqp);
+ xfs_qm_dqrele(pdqp);
+
+ *ipp = ip;
+ return 0;
+
+ out_trans_cancel:
+ xfs_trans_cancel(tp);
+ out_release_inode:
+ /*
+ * Wait until after the current transaction is aborted to finish the
+ * setup of the inode and release the inode. This prevents recursive
+ * transactions and deadlocks from xfs_inactive.
+ */
+ if (ip) {
+ xfs_finish_inode_setup(ip);
+ xfs_irele(ip);
+ }
+
+ xfs_qm_dqrele(udqp);
+ xfs_qm_dqrele(gdqp);
+ xfs_qm_dqrele(pdqp);
+
+ return error;
+}
+
+int
+xfs_link(
+ xfs_inode_t *tdp,
+ xfs_inode_t *sip,
+ struct xfs_name *target_name)
+{
+ xfs_mount_t *mp = tdp->i_mount;
+ xfs_trans_t *tp;
+ int error;
+ int resblks;
+
+ trace_xfs_link(tdp, target_name);
+
+ ASSERT(!S_ISDIR(VFS_I(sip)->i_mode));
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return -EIO;
+
+ error = xfs_qm_dqattach(sip);
+ if (error)
+ goto std_return;
+
+ error = xfs_qm_dqattach(tdp);
+ if (error)
+ goto std_return;
+
+ resblks = XFS_LINK_SPACE_RES(mp, target_name->len);
+ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_link, resblks, 0, 0, &tp);
+ if (error == -ENOSPC) {
+ resblks = 0;
+ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_link, 0, 0, 0, &tp);
+ }
+ if (error)
+ goto std_return;
+
+ xfs_lock_two_inodes(sip, XFS_ILOCK_EXCL, tdp, XFS_ILOCK_EXCL);
+
+ xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL);
+
+ /*
+ * If we are using project inheritance, we only allow hard link
+ * creation in our tree when the project IDs are the same; else
+ * the tree quota mechanism could be circumvented.
+ */
+ if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
+ (xfs_get_projid(tdp) != xfs_get_projid(sip)))) {
+ error = -EXDEV;
+ goto error_return;
+ }
+
+ if (!resblks) {
+ error = xfs_dir_canenter(tp, tdp, target_name);
+ if (error)
+ goto error_return;
+ }
+
+ /*
+ * Handle initial link state of O_TMPFILE inode
+ */
+ if (VFS_I(sip)->i_nlink == 0) {
+ error = xfs_iunlink_remove(tp, sip);
+ if (error)
+ goto error_return;
+ }
+
+ error = xfs_dir_createname(tp, tdp, target_name, sip->i_ino,
+ resblks);
+ if (error)
+ goto error_return;
+ xfs_trans_ichgtime(tp, tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
+ xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE);
+
+ error = xfs_bumplink(tp, sip);
+ if (error)
+ goto error_return;
+
+ /*
+ * If this is a synchronous mount, make sure that the
+ * link transaction goes to disk before returning to
+ * the user.
+ */
+ if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
+ xfs_trans_set_sync(tp);
+
+ return xfs_trans_commit(tp);
+
+ error_return:
+ xfs_trans_cancel(tp);
+ std_return:
+ return error;
+}
+
+/* Clear the reflink flag and the cowblocks tag if possible. */
+static void
+xfs_itruncate_clear_reflink_flags(
+ struct xfs_inode *ip)
+{
+ struct xfs_ifork *dfork;
+ struct xfs_ifork *cfork;
+
+ if (!xfs_is_reflink_inode(ip))
+ return;
+ dfork = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
+ cfork = XFS_IFORK_PTR(ip, XFS_COW_FORK);
+ if (dfork->if_bytes == 0 && cfork->if_bytes == 0)
+ ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK;
+ if (cfork->if_bytes == 0)
+ xfs_inode_clear_cowblocks_tag(ip);
+}
+
+/*
+ * Free up the underlying blocks past new_size. The new size must be smaller
+ * than the current size. This routine can be used both for the attribute and
+ * data fork, and does not modify the inode size, which is left to the caller.
+ *
+ * The transaction passed to this routine must have made a permanent log
+ * reservation of at least XFS_ITRUNCATE_LOG_RES. This routine may commit the
+ * given transaction and start new ones, so make sure everything involved in
+ * the transaction is tidy before calling here. Some transaction will be
+ * returned to the caller to be committed. The incoming transaction must
+ * already include the inode, and both inode locks must be held exclusively.
+ * The inode must also be "held" within the transaction. On return the inode
+ * will be "held" within the returned transaction. This routine does NOT
+ * require any disk space to be reserved for it within the transaction.
+ *
+ * If we get an error, we must return with the inode locked and linked into the
+ * current transaction. This keeps things simple for the higher level code,
+ * because it always knows that the inode is locked and held in the transaction
+ * that returns to it whether errors occur or not. We don't mark the inode
+ * dirty on error so that transactions can be easily aborted if possible.
+ */
+int
+xfs_itruncate_extents_flags(
+ struct xfs_trans **tpp,
+ struct xfs_inode *ip,
+ int whichfork,
+ xfs_fsize_t new_size,
+ int flags)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_trans *tp = *tpp;
+ xfs_fileoff_t first_unmap_block;
+ xfs_fileoff_t last_block;
+ xfs_filblks_t unmap_len;
+ int error = 0;
+ int done = 0;
+
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+ ASSERT(!atomic_read(&VFS_I(ip)->i_count) ||
+ xfs_isilocked(ip, XFS_IOLOCK_EXCL));
+ ASSERT(new_size <= XFS_ISIZE(ip));
+ ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
+ ASSERT(ip->i_itemp != NULL);
+ ASSERT(ip->i_itemp->ili_lock_flags == 0);
+ ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
+
+ trace_xfs_itruncate_extents_start(ip, new_size);
+
+ flags |= xfs_bmapi_aflag(whichfork);
+
+ /*
+ * Since it is possible for space to become allocated beyond
+ * the end of the file (in a crash where the space is allocated
+ * but the inode size is not yet updated), simply remove any
+ * blocks which show up between the new EOF and the maximum
+ * possible file size. If the first block to be removed is
+ * beyond the maximum file size (ie it is the same as last_block),
+ * then there is nothing to do.
+ */
+ first_unmap_block = XFS_B_TO_FSB(mp, (xfs_ufsize_t)new_size);
+ last_block = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
+ if (first_unmap_block == last_block)
+ return 0;
+
+ ASSERT(first_unmap_block < last_block);
+ unmap_len = last_block - first_unmap_block + 1;
+ while (!done) {
+ ASSERT(tp->t_firstblock == NULLFSBLOCK);
+ error = xfs_bunmapi(tp, ip, first_unmap_block, unmap_len, flags,
+ XFS_ITRUNC_MAX_EXTENTS, &done);
+ if (error)
+ goto out;
+
+ /*
+ * Duplicate the transaction that has the permanent
+ * reservation and commit the old transaction.
+ */
+ error = xfs_defer_finish(&tp);
+ if (error)
+ goto out;
+
+ error = xfs_trans_roll_inode(&tp, ip);
+ if (error)
+ goto out;
+ }
+
+ if (whichfork == XFS_DATA_FORK) {
+ /* Remove all pending CoW reservations. */
+ error = xfs_reflink_cancel_cow_blocks(ip, &tp,
+ first_unmap_block, last_block, true);
+ if (error)
+ goto out;
+
+ xfs_itruncate_clear_reflink_flags(ip);
+ }
+
+ /*
+ * Always re-log the inode so that our permanent transaction can keep
+ * on rolling it forward in the log.
+ */
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+
+ trace_xfs_itruncate_extents_end(ip, new_size);
+
+out:
+ *tpp = tp;
+ return error;
+}
+
+int
+xfs_release(
+ xfs_inode_t *ip)
+{
+ xfs_mount_t *mp = ip->i_mount;
+ int error;
+
+ if (!S_ISREG(VFS_I(ip)->i_mode) || (VFS_I(ip)->i_mode == 0))
+ return 0;
+
+ /* If this is a read-only mount, don't do this (would generate I/O) */
+ if (mp->m_flags & XFS_MOUNT_RDONLY)
+ return 0;
+
+ if (!XFS_FORCED_SHUTDOWN(mp)) {
+ int truncated;
+
+ /*
+ * If we previously truncated this file and removed old data
+ * in the process, we want to initiate "early" writeout on
+ * the last close. This is an attempt to combat the notorious
+ * NULL files problem which is particularly noticeable from a
+ * truncate down, buffered (re-)write (delalloc), followed by
+ * a crash. What we are effectively doing here is
+ * significantly reducing the time window where we'd otherwise
+ * be exposed to that problem.
+ */
+ truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED);
+ if (truncated) {
+ xfs_iflags_clear(ip, XFS_IDIRTY_RELEASE);
+ if (ip->i_delayed_blks > 0) {
+ error = filemap_flush(VFS_I(ip)->i_mapping);
+ if (error)
+ return error;
+ }
+ }
+ }
+
+ if (VFS_I(ip)->i_nlink == 0)
+ return 0;
+
+ if (xfs_can_free_eofblocks(ip, false)) {
+
+ /*
+ * Check if the inode is being opened, written and closed
+ * frequently and we have delayed allocation blocks outstanding
+ * (e.g. streaming writes from the NFS server), truncating the
+ * blocks past EOF will cause fragmentation to occur.
+ *
+ * In this case don't do the truncation, but we have to be
+ * careful how we detect this case. Blocks beyond EOF show up as
+ * i_delayed_blks even when the inode is clean, so we need to
+ * truncate them away first before checking for a dirty release.
+ * Hence on the first dirty close we will still remove the
+ * speculative allocation, but after that we will leave it in
+ * place.
+ */
+ if (xfs_iflags_test(ip, XFS_IDIRTY_RELEASE))
+ return 0;
+ /*
+ * If we can't get the iolock just skip truncating the blocks
+ * past EOF because we could deadlock with the mmap_sem
+ * otherwise. We'll get another chance to drop them once the
+ * last reference to the inode is dropped, so we'll never leak
+ * blocks permanently.
+ */
+ if (xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) {
+ error = xfs_free_eofblocks(ip);
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+ if (error)
+ return error;
+ }
+
+ /* delalloc blocks after truncation means it really is dirty */
+ if (ip->i_delayed_blks)
+ xfs_iflags_set(ip, XFS_IDIRTY_RELEASE);
+ }
+ return 0;
+}
+
+/*
+ * xfs_inactive_truncate
+ *
+ * Called to perform a truncate when an inode becomes unlinked.
+ */
+STATIC int
+xfs_inactive_truncate(
+ struct xfs_inode *ip)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_trans *tp;
+ int error;
+
+ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
+ if (error) {
+ ASSERT(XFS_FORCED_SHUTDOWN(mp));
+ return error;
+ }
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, ip, 0);
+
+ /*
+ * Log the inode size first to prevent stale data exposure in the event
+ * of a system crash before the truncate completes. See the related
+ * comment in xfs_vn_setattr_size() for details.
+ */
+ ip->i_d.di_size = 0;
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+
+ error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0);
+ if (error)
+ goto error_trans_cancel;
+
+ ASSERT(ip->i_d.di_nextents == 0);
+
+ error = xfs_trans_commit(tp);
+ if (error)
+ goto error_unlock;
+
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ return 0;
+
+error_trans_cancel:
+ xfs_trans_cancel(tp);
+error_unlock:
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ return error;
+}
+
+/*
+ * xfs_inactive_ifree()
+ *
+ * Perform the inode free when an inode is unlinked.
+ */
+STATIC int
+xfs_inactive_ifree(
+ struct xfs_inode *ip)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_trans *tp;
+ int error;
+
+ /*
+ * We try to use a per-AG reservation for any block needed by the finobt
+ * tree, but as the finobt feature predates the per-AG reservation
+ * support a degraded file system might not have enough space for the
+ * reservation at mount time. In that case try to dip into the reserved
+ * pool and pray.
+ *
+ * Send a warning if the reservation does happen to fail, as the inode
+ * now remains allocated and sits on the unlinked list until the fs is
+ * repaired.
+ */
+ if (unlikely(mp->m_inotbt_nores)) {
+ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ifree,
+ XFS_IFREE_SPACE_RES(mp), 0, XFS_TRANS_RESERVE,
+ &tp);
+ } else {
+ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ifree, 0, 0, 0, &tp);
+ }
+ if (error) {
+ if (error == -ENOSPC) {
+ xfs_warn_ratelimited(mp,
+ "Failed to remove inode(s) from unlinked list. "
+ "Please free space, unmount and run xfs_repair.");
+ } else {
+ ASSERT(XFS_FORCED_SHUTDOWN(mp));
+ }
+ return error;
+ }
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, ip, 0);
+
+ error = xfs_ifree(tp, ip);
+ if (error) {
+ /*
+ * If we fail to free the inode, shut down. The cancel
+ * might do that, we need to make sure. Otherwise the
+ * inode might be lost for a long time or forever.
+ */
+ if (!XFS_FORCED_SHUTDOWN(mp)) {
+ xfs_notice(mp, "%s: xfs_ifree returned error %d",
+ __func__, error);
+ xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
+ }
+ xfs_trans_cancel(tp);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ return error;
+ }
+
+ /*
+ * Credit the quota account(s). The inode is gone.
+ */
+ xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_ICOUNT, -1);
+
+ /*
+ * Just ignore errors at this point. There is nothing we can do except
+ * to try to keep going. Make sure it's not a silent error.
+ */
+ error = xfs_trans_commit(tp);
+ if (error)
+ xfs_notice(mp, "%s: xfs_trans_commit returned error %d",
+ __func__, error);
+
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ return 0;
+}
+
+/*
+ * xfs_inactive
+ *
+ * This is called when the vnode reference count for the vnode
+ * goes to zero. If the file has been unlinked, then it must
+ * now be truncated. Also, we clear all of the read-ahead state
+ * kept for the inode here since the file is now closed.
+ */
+void
+xfs_inactive(
+ xfs_inode_t *ip)
+{
+ struct xfs_mount *mp;
+ int error;
+ int truncate = 0;
+
+ /*
+ * If the inode is already free, then there can be nothing
+ * to clean up here.
+ */
+ if (VFS_I(ip)->i_mode == 0) {
+ ASSERT(ip->i_df.if_broot_bytes == 0);
+ return;
+ }
+
+ mp = ip->i_mount;
+ ASSERT(!xfs_iflags_test(ip, XFS_IRECOVERY));
+
+ /* If this is a read-only mount, don't do this (would generate I/O) */
+ if (mp->m_flags & XFS_MOUNT_RDONLY)
+ return;
+
+ /* Try to clean out the cow blocks if there are any. */
+ if (xfs_inode_has_cow_data(ip))
+ xfs_reflink_cancel_cow_range(ip, 0, NULLFILEOFF, true);
+
+ if (VFS_I(ip)->i_nlink != 0) {
+ /*
+ * force is true because we are evicting an inode from the
+ * cache. Post-eof blocks must be freed, lest we end up with
+ * broken free space accounting.
+ *
+ * Note: don't bother with iolock here since lockdep complains
+ * about acquiring it in reclaim context. We have the only
+ * reference to the inode at this point anyways.
+ */
+ if (xfs_can_free_eofblocks(ip, true))
+ xfs_free_eofblocks(ip);
+
+ return;
+ }
+
+ if (S_ISREG(VFS_I(ip)->i_mode) &&
+ (ip->i_d.di_size != 0 || XFS_ISIZE(ip) != 0 ||
+ ip->i_d.di_nextents > 0 || ip->i_delayed_blks > 0))
+ truncate = 1;
+
+ error = xfs_qm_dqattach(ip);
+ if (error)
+ return;
+
+ if (S_ISLNK(VFS_I(ip)->i_mode))
+ error = xfs_inactive_symlink(ip);
+ else if (truncate)
+ error = xfs_inactive_truncate(ip);
+ if (error)
+ return;
+
+ /*
+ * If there are attributes associated with the file then blow them away
+ * now. The code calls a routine that recursively deconstructs the
+ * attribute fork. If also blows away the in-core attribute fork.
+ */
+ if (XFS_IFORK_Q(ip)) {
+ error = xfs_attr_inactive(ip);
+ if (error)
+ return;
+ }
+
+ ASSERT(!ip->i_afp);
+ ASSERT(ip->i_d.di_anextents == 0);
+ ASSERT(ip->i_d.di_forkoff == 0);
+
+ /*
+ * Free the inode.
+ */
+ error = xfs_inactive_ifree(ip);
+ if (error)
+ return;
+
+ /*
+ * Release the dquots held by inode, if any.
+ */
+ xfs_qm_dqdetach(ip);
+}
+
+/*
+ * This is called when the inode's link count goes to 0 or we are creating a
+ * tmpfile via O_TMPFILE. In the case of a tmpfile, @ignore_linkcount will be
+ * set to true as the link count is dropped to zero by the VFS after we've
+ * created the file successfully, so we have to add it to the unlinked list
+ * while the link count is non-zero.
+ *
+ * We place the on-disk inode on a list in the AGI. It will be pulled from this
+ * list when the inode is freed.
+ */
+STATIC int
+xfs_iunlink(
+ struct xfs_trans *tp,
+ struct xfs_inode *ip)
+{
+ xfs_mount_t *mp = tp->t_mountp;
+ xfs_agi_t *agi;
+ xfs_dinode_t *dip;
+ xfs_buf_t *agibp;
+ xfs_buf_t *ibp;
+ xfs_agino_t agino;
+ short bucket_index;
+ int offset;
+ int error;
+
+ ASSERT(VFS_I(ip)->i_mode != 0);
+
+ /*
+ * Get the agi buffer first. It ensures lock ordering
+ * on the list.
+ */
+ error = xfs_read_agi(mp, tp, XFS_INO_TO_AGNO(mp, ip->i_ino), &agibp);
+ if (error)
+ return error;
+ agi = XFS_BUF_TO_AGI(agibp);
+
+ /*
+ * Get the index into the agi hash table for the
+ * list this inode will go on.
+ */
+ agino = XFS_INO_TO_AGINO(mp, ip->i_ino);
+ ASSERT(agino != 0);
+ bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS;
+ ASSERT(agi->agi_unlinked[bucket_index]);
+ ASSERT(be32_to_cpu(agi->agi_unlinked[bucket_index]) != agino);
+
+ if (agi->agi_unlinked[bucket_index] != cpu_to_be32(NULLAGINO)) {
+ /*
+ * There is already another inode in the bucket we need
+ * to add ourselves to. Add us at the front of the list.
+ * Here we put the head pointer into our next pointer,
+ * and then we fall through to point the head at us.
+ */
+ error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp,
+ 0, 0);
+ if (error)
+ return error;
+
+ ASSERT(dip->di_next_unlinked == cpu_to_be32(NULLAGINO));
+ dip->di_next_unlinked = agi->agi_unlinked[bucket_index];
+ offset = ip->i_imap.im_boffset +
+ offsetof(xfs_dinode_t, di_next_unlinked);
+
+ /* need to recalc the inode CRC if appropriate */
+ xfs_dinode_calc_crc(mp, dip);
+
+ xfs_trans_inode_buf(tp, ibp);
+ xfs_trans_log_buf(tp, ibp, offset,
+ (offset + sizeof(xfs_agino_t) - 1));
+ xfs_inobp_check(mp, ibp);
+ }
+
+ /*
+ * Point the bucket head pointer at the inode being inserted.
+ */
+ ASSERT(agino != 0);
+ agi->agi_unlinked[bucket_index] = cpu_to_be32(agino);
+ offset = offsetof(xfs_agi_t, agi_unlinked) +
+ (sizeof(xfs_agino_t) * bucket_index);
+ xfs_trans_log_buf(tp, agibp, offset,
+ (offset + sizeof(xfs_agino_t) - 1));
+ return 0;
+}
+
+/*
+ * Pull the on-disk inode from the AGI unlinked list.
+ */
+STATIC int
+xfs_iunlink_remove(
+ xfs_trans_t *tp,
+ xfs_inode_t *ip)
+{
+ xfs_ino_t next_ino;
+ xfs_mount_t *mp;
+ xfs_agi_t *agi;
+ xfs_dinode_t *dip;
+ xfs_buf_t *agibp;
+ xfs_buf_t *ibp;
+ xfs_agnumber_t agno;
+ xfs_agino_t agino;
+ xfs_agino_t next_agino;
+ xfs_buf_t *last_ibp;
+ xfs_dinode_t *last_dip = NULL;
+ short bucket_index;
+ int offset, last_offset = 0;
+ int error;
+
+ mp = tp->t_mountp;
+ agno = XFS_INO_TO_AGNO(mp, ip->i_ino);
+
+ /*
+ * Get the agi buffer first. It ensures lock ordering
+ * on the list.
+ */
+ error = xfs_read_agi(mp, tp, agno, &agibp);
+ if (error)
+ return error;
+
+ agi = XFS_BUF_TO_AGI(agibp);
+
+ /*
+ * Get the index into the agi hash table for the
+ * list this inode will go on.
+ */
+ agino = XFS_INO_TO_AGINO(mp, ip->i_ino);
+ if (!xfs_verify_agino(mp, agno, agino))
+ return -EFSCORRUPTED;
+ bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS;
+ if (!xfs_verify_agino(mp, agno,
+ be32_to_cpu(agi->agi_unlinked[bucket_index]))) {
+ XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
+ agi, sizeof(*agi));
+ return -EFSCORRUPTED;
+ }
+
+ if (be32_to_cpu(agi->agi_unlinked[bucket_index]) == agino) {
+ /*
+ * We're at the head of the list. Get the inode's on-disk
+ * buffer to see if there is anyone after us on the list.
+ * Only modify our next pointer if it is not already NULLAGINO.
+ * This saves us the overhead of dealing with the buffer when
+ * there is no need to change it.
+ */
+ error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp,
+ 0, 0);
+ if (error) {
+ xfs_warn(mp, "%s: xfs_imap_to_bp returned error %d.",
+ __func__, error);
+ return error;
+ }
+ next_agino = be32_to_cpu(dip->di_next_unlinked);
+ ASSERT(next_agino != 0);
+ if (next_agino != NULLAGINO) {
+ dip->di_next_unlinked = cpu_to_be32(NULLAGINO);
+ offset = ip->i_imap.im_boffset +
+ offsetof(xfs_dinode_t, di_next_unlinked);
+
+ /* need to recalc the inode CRC if appropriate */
+ xfs_dinode_calc_crc(mp, dip);
+
+ xfs_trans_inode_buf(tp, ibp);
+ xfs_trans_log_buf(tp, ibp, offset,
+ (offset + sizeof(xfs_agino_t) - 1));
+ xfs_inobp_check(mp, ibp);
+ } else {
+ xfs_trans_brelse(tp, ibp);
+ }
+ /*
+ * Point the bucket head pointer at the next inode.
+ */
+ ASSERT(next_agino != 0);
+ ASSERT(next_agino != agino);
+ agi->agi_unlinked[bucket_index] = cpu_to_be32(next_agino);
+ offset = offsetof(xfs_agi_t, agi_unlinked) +
+ (sizeof(xfs_agino_t) * bucket_index);
+ xfs_trans_log_buf(tp, agibp, offset,
+ (offset + sizeof(xfs_agino_t) - 1));
+ } else {
+ /*
+ * We need to search the list for the inode being freed.
+ */
+ next_agino = be32_to_cpu(agi->agi_unlinked[bucket_index]);
+ last_ibp = NULL;
+ while (next_agino != agino) {
+ struct xfs_imap imap;
+
+ if (last_ibp)
+ xfs_trans_brelse(tp, last_ibp);
+
+ imap.im_blkno = 0;
+ next_ino = XFS_AGINO_TO_INO(mp, agno, next_agino);
+
+ error = xfs_imap(mp, tp, next_ino, &imap, 0);
+ if (error) {
+ xfs_warn(mp,
+ "%s: xfs_imap returned error %d.",
+ __func__, error);
+ return error;
+ }
+
+ error = xfs_imap_to_bp(mp, tp, &imap, &last_dip,
+ &last_ibp, 0, 0);
+ if (error) {
+ xfs_warn(mp,
+ "%s: xfs_imap_to_bp returned error %d.",
+ __func__, error);
+ return error;
+ }
+
+ last_offset = imap.im_boffset;
+ next_agino = be32_to_cpu(last_dip->di_next_unlinked);
+ if (!xfs_verify_agino(mp, agno, next_agino)) {
+ XFS_CORRUPTION_ERROR(__func__,
+ XFS_ERRLEVEL_LOW, mp,
+ last_dip, sizeof(*last_dip));
+ return -EFSCORRUPTED;
+ }
+ }
+
+ /*
+ * Now last_ibp points to the buffer previous to us on the
+ * unlinked list. Pull us from the list.
+ */
+ error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp,
+ 0, 0);
+ if (error) {
+ xfs_warn(mp, "%s: xfs_imap_to_bp(2) returned error %d.",
+ __func__, error);
+ return error;
+ }
+ next_agino = be32_to_cpu(dip->di_next_unlinked);
+ ASSERT(next_agino != 0);
+ ASSERT(next_agino != agino);
+ if (next_agino != NULLAGINO) {
+ dip->di_next_unlinked = cpu_to_be32(NULLAGINO);
+ offset = ip->i_imap.im_boffset +
+ offsetof(xfs_dinode_t, di_next_unlinked);
+
+ /* need to recalc the inode CRC if appropriate */
+ xfs_dinode_calc_crc(mp, dip);
+
+ xfs_trans_inode_buf(tp, ibp);
+ xfs_trans_log_buf(tp, ibp, offset,
+ (offset + sizeof(xfs_agino_t) - 1));
+ xfs_inobp_check(mp, ibp);
+ } else {
+ xfs_trans_brelse(tp, ibp);
+ }
+ /*
+ * Point the previous inode on the list to the next inode.
+ */
+ last_dip->di_next_unlinked = cpu_to_be32(next_agino);
+ ASSERT(next_agino != 0);
+ offset = last_offset + offsetof(xfs_dinode_t, di_next_unlinked);
+
+ /* need to recalc the inode CRC if appropriate */
+ xfs_dinode_calc_crc(mp, last_dip);
+
+ xfs_trans_inode_buf(tp, last_ibp);
+ xfs_trans_log_buf(tp, last_ibp, offset,
+ (offset + sizeof(xfs_agino_t) - 1));
+ xfs_inobp_check(mp, last_ibp);
+ }
+ return 0;
+}
+
+/*
+ * A big issue when freeing the inode cluster is that we _cannot_ skip any
+ * inodes that are in memory - they all must be marked stale and attached to
+ * the cluster buffer.
+ */
+STATIC int
+xfs_ifree_cluster(
+ xfs_inode_t *free_ip,
+ xfs_trans_t *tp,
+ struct xfs_icluster *xic)
+{
+ xfs_mount_t *mp = free_ip->i_mount;
+ int blks_per_cluster;
+ int inodes_per_cluster;
+ int nbufs;
+ int i, j;
+ int ioffset;
+ xfs_daddr_t blkno;
+ xfs_buf_t *bp;
+ xfs_inode_t *ip;
+ xfs_inode_log_item_t *iip;
+ struct xfs_log_item *lip;
+ struct xfs_perag *pag;
+ xfs_ino_t inum;
+
+ inum = xic->first_ino;
+ pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, inum));
+ blks_per_cluster = xfs_icluster_size_fsb(mp);
+ inodes_per_cluster = blks_per_cluster << mp->m_sb.sb_inopblog;
+ nbufs = mp->m_ialloc_blks / blks_per_cluster;
+
+ for (j = 0; j < nbufs; j++, inum += inodes_per_cluster) {
+ /*
+ * The allocation bitmap tells us which inodes of the chunk were
+ * physically allocated. Skip the cluster if an inode falls into
+ * a sparse region.
+ */
+ ioffset = inum - xic->first_ino;
+ if ((xic->alloc & XFS_INOBT_MASK(ioffset)) == 0) {
+ ASSERT(ioffset % inodes_per_cluster == 0);
+ continue;
+ }
+
+ blkno = XFS_AGB_TO_DADDR(mp, XFS_INO_TO_AGNO(mp, inum),
+ XFS_INO_TO_AGBNO(mp, inum));
+
+ /*
+ * We obtain and lock the backing buffer first in the process
+ * here, as we have to ensure that any dirty inode that we
+ * can't get the flush lock on is attached to the buffer.
+ * If we scan the in-memory inodes first, then buffer IO can
+ * complete before we get a lock on it, and hence we may fail
+ * to mark all the active inodes on the buffer stale.
+ */
+ bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, blkno,
+ mp->m_bsize * blks_per_cluster,
+ XBF_UNMAPPED);
+
+ if (!bp)
+ return -ENOMEM;
+
+ /*
+ * This buffer may not have been correctly initialised as we
+ * didn't read it from disk. That's not important because we are
+ * only using to mark the buffer as stale in the log, and to
+ * attach stale cached inodes on it. That means it will never be
+ * dispatched for IO. If it is, we want to know about it, and we
+ * want it to fail. We can acheive this by adding a write
+ * verifier to the buffer.
+ */
+ bp->b_ops = &xfs_inode_buf_ops;
+
+ /*
+ * Walk the inodes already attached to the buffer and mark them
+ * stale. These will all have the flush locks held, so an
+ * in-memory inode walk can't lock them. By marking them all
+ * stale first, we will not attempt to lock them in the loop
+ * below as the XFS_ISTALE flag will be set.
+ */
+ list_for_each_entry(lip, &bp->b_li_list, li_bio_list) {
+ if (lip->li_type == XFS_LI_INODE) {
+ iip = (xfs_inode_log_item_t *)lip;
+ ASSERT(iip->ili_logged == 1);
+ lip->li_cb = xfs_istale_done;
+ xfs_trans_ail_copy_lsn(mp->m_ail,
+ &iip->ili_flush_lsn,
+ &iip->ili_item.li_lsn);
+ xfs_iflags_set(iip->ili_inode, XFS_ISTALE);
+ }
+ }
+
+
+ /*
+ * For each inode in memory attempt to add it to the inode
+ * buffer and set it up for being staled on buffer IO
+ * completion. This is safe as we've locked out tail pushing
+ * and flushing by locking the buffer.
+ *
+ * We have already marked every inode that was part of a
+ * transaction stale above, which means there is no point in
+ * even trying to lock them.
+ */
+ for (i = 0; i < inodes_per_cluster; i++) {
+retry:
+ rcu_read_lock();
+ ip = radix_tree_lookup(&pag->pag_ici_root,
+ XFS_INO_TO_AGINO(mp, (inum + i)));
+
+ /* Inode not in memory, nothing to do */
+ if (!ip) {
+ rcu_read_unlock();
+ continue;
+ }
+
+ /*
+ * because this is an RCU protected lookup, we could
+ * find a recently freed or even reallocated inode
+ * during the lookup. We need to check under the
+ * i_flags_lock for a valid inode here. Skip it if it
+ * is not valid, the wrong inode or stale.
+ */
+ spin_lock(&ip->i_flags_lock);
+ if (ip->i_ino != inum + i ||
+ __xfs_iflags_test(ip, XFS_ISTALE)) {
+ spin_unlock(&ip->i_flags_lock);
+ rcu_read_unlock();
+ continue;
+ }
+ spin_unlock(&ip->i_flags_lock);
+
+ /*
+ * Don't try to lock/unlock the current inode, but we
+ * _cannot_ skip the other inodes that we did not find
+ * in the list attached to the buffer and are not
+ * already marked stale. If we can't lock it, back off
+ * and retry.
+ */
+ if (ip != free_ip) {
+ if (!xfs_ilock_nowait(ip, XFS_ILOCK_EXCL)) {
+ rcu_read_unlock();
+ delay(1);
+ goto retry;
+ }
+
+ /*
+ * Check the inode number again in case we're
+ * racing with freeing in xfs_reclaim_inode().
+ * See the comments in that function for more
+ * information as to why the initial check is
+ * not sufficient.
+ */
+ if (ip->i_ino != inum + i) {
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ rcu_read_unlock();
+ continue;
+ }
+ }
+ rcu_read_unlock();
+
+ xfs_iflock(ip);
+ xfs_iflags_set(ip, XFS_ISTALE);
+
+ /*
+ * we don't need to attach clean inodes or those only
+ * with unlogged changes (which we throw away, anyway).
+ */
+ iip = ip->i_itemp;
+ if (!iip || xfs_inode_clean(ip)) {
+ ASSERT(ip != free_ip);
+ xfs_ifunlock(ip);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ continue;
+ }
+
+ iip->ili_last_fields = iip->ili_fields;
+ iip->ili_fields = 0;
+ iip->ili_fsync_fields = 0;
+ iip->ili_logged = 1;
+ xfs_trans_ail_copy_lsn(mp->m_ail, &iip->ili_flush_lsn,
+ &iip->ili_item.li_lsn);
+
+ xfs_buf_attach_iodone(bp, xfs_istale_done,
+ &iip->ili_item);
+
+ if (ip != free_ip)
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ }
+
+ xfs_trans_stale_inode_buf(tp, bp);
+ xfs_trans_binval(tp, bp);
+ }
+
+ xfs_perag_put(pag);
+ return 0;
+}
+
+/*
+ * Free any local-format buffers sitting around before we reset to
+ * extents format.
+ */
+static inline void
+xfs_ifree_local_data(
+ struct xfs_inode *ip,
+ int whichfork)
+{
+ struct xfs_ifork *ifp;
+
+ if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
+ return;
+
+ ifp = XFS_IFORK_PTR(ip, whichfork);
+ xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
+}
+
+/*
+ * This is called to return an inode to the inode free list.
+ * The inode should already be truncated to 0 length and have
+ * no pages associated with it. This routine also assumes that
+ * the inode is already a part of the transaction.
+ *
+ * The on-disk copy of the inode will have been added to the list
+ * of unlinked inodes in the AGI. We need to remove the inode from
+ * that list atomically with respect to freeing it here.
+ */
+int
+xfs_ifree(
+ struct xfs_trans *tp,
+ struct xfs_inode *ip)
+{
+ int error;
+ struct xfs_icluster xic = { 0 };
+
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+ ASSERT(VFS_I(ip)->i_nlink == 0);
+ ASSERT(ip->i_d.di_nextents == 0);
+ ASSERT(ip->i_d.di_anextents == 0);
+ ASSERT(ip->i_d.di_size == 0 || !S_ISREG(VFS_I(ip)->i_mode));
+ ASSERT(ip->i_d.di_nblocks == 0);
+
+ /*
+ * Pull the on-disk inode from the AGI unlinked list.
+ */
+ error = xfs_iunlink_remove(tp, ip);
+ if (error)
+ return error;
+
+ error = xfs_difree(tp, ip->i_ino, &xic);
+ if (error)
+ return error;
+
+ xfs_ifree_local_data(ip, XFS_DATA_FORK);
+ xfs_ifree_local_data(ip, XFS_ATTR_FORK);
+
+ VFS_I(ip)->i_mode = 0; /* mark incore inode as free */
+ ip->i_d.di_flags = 0;
+ ip->i_d.di_flags2 = 0;
+ ip->i_d.di_dmevmask = 0;
+ ip->i_d.di_forkoff = 0; /* mark the attr fork not in use */
+ ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS;
+ ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
+
+ /* Don't attempt to replay owner changes for a deleted inode */
+ ip->i_itemp->ili_fields &= ~(XFS_ILOG_AOWNER|XFS_ILOG_DOWNER);
+
+ /*
+ * Bump the generation count so no one will be confused
+ * by reincarnations of this inode.
+ */
+ VFS_I(ip)->i_generation++;
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+
+ if (xic.deleted)
+ error = xfs_ifree_cluster(ip, tp, &xic);
+
+ return error;
+}
+
+/*
+ * This is called to unpin an inode. The caller must have the inode locked
+ * in at least shared mode so that the buffer cannot be subsequently pinned
+ * once someone is waiting for it to be unpinned.
+ */
+static void
+xfs_iunpin(
+ struct xfs_inode *ip)
+{
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
+
+ trace_xfs_inode_unpin_nowait(ip, _RET_IP_);
+
+ /* Give the log a push to start the unpinning I/O */
+ xfs_log_force_lsn(ip->i_mount, ip->i_itemp->ili_last_lsn, 0, NULL);
+
+}
+
+static void
+__xfs_iunpin_wait(
+ struct xfs_inode *ip)
+{
+ wait_queue_head_t *wq = bit_waitqueue(&ip->i_flags, __XFS_IPINNED_BIT);
+ DEFINE_WAIT_BIT(wait, &ip->i_flags, __XFS_IPINNED_BIT);
+
+ xfs_iunpin(ip);
+
+ do {
+ prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE);
+ if (xfs_ipincount(ip))
+ io_schedule();
+ } while (xfs_ipincount(ip));
+ finish_wait(wq, &wait.wq_entry);
+}
+
+void
+xfs_iunpin_wait(
+ struct xfs_inode *ip)
+{
+ if (xfs_ipincount(ip))
+ __xfs_iunpin_wait(ip);
+}
+
+/*
+ * Removing an inode from the namespace involves removing the directory entry
+ * and dropping the link count on the inode. Removing the directory entry can
+ * result in locking an AGF (directory blocks were freed) and removing a link
+ * count can result in placing the inode on an unlinked list which results in
+ * locking an AGI.
+ *
+ * The big problem here is that we have an ordering constraint on AGF and AGI
+ * locking - inode allocation locks the AGI, then can allocate a new extent for
+ * new inodes, locking the AGF after the AGI. Similarly, freeing the inode
+ * removes the inode from the unlinked list, requiring that we lock the AGI
+ * first, and then freeing the inode can result in an inode chunk being freed
+ * and hence freeing disk space requiring that we lock an AGF.
+ *
+ * Hence the ordering that is imposed by other parts of the code is AGI before
+ * AGF. This means we cannot remove the directory entry before we drop the inode
+ * reference count and put it on the unlinked list as this results in a lock
+ * order of AGF then AGI, and this can deadlock against inode allocation and
+ * freeing. Therefore we must drop the link counts before we remove the
+ * directory entry.
+ *
+ * This is still safe from a transactional point of view - it is not until we
+ * get to xfs_defer_finish() that we have the possibility of multiple
+ * transactions in this operation. Hence as long as we remove the directory
+ * entry and drop the link count in the first transaction of the remove
+ * operation, there are no transactional constraints on the ordering here.
+ */
+int
+xfs_remove(
+ xfs_inode_t *dp,
+ struct xfs_name *name,
+ xfs_inode_t *ip)
+{
+ xfs_mount_t *mp = dp->i_mount;
+ xfs_trans_t *tp = NULL;
+ int is_dir = S_ISDIR(VFS_I(ip)->i_mode);
+ int error = 0;
+ uint resblks;
+
+ trace_xfs_remove(dp, name);
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return -EIO;
+
+ error = xfs_qm_dqattach(dp);
+ if (error)
+ goto std_return;
+
+ error = xfs_qm_dqattach(ip);
+ if (error)
+ goto std_return;
+
+ /*
+ * We try to get the real space reservation first,
+ * allowing for directory btree deletion(s) implying
+ * possible bmap insert(s). If we can't get the space
+ * reservation then we use 0 instead, and avoid the bmap
+ * btree insert(s) in the directory code by, if the bmap
+ * insert tries to happen, instead trimming the LAST
+ * block from the directory.
+ */
+ resblks = XFS_REMOVE_SPACE_RES(mp);
+ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_remove, resblks, 0, 0, &tp);
+ if (error == -ENOSPC) {
+ resblks = 0;
+ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_remove, 0, 0, 0,
+ &tp);
+ }
+ if (error) {
+ ASSERT(error != -ENOSPC);
+ goto std_return;
+ }
+
+ xfs_lock_two_inodes(dp, XFS_ILOCK_EXCL, ip, XFS_ILOCK_EXCL);
+
+ xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+
+ /*
+ * If we're removing a directory perform some additional validation.
+ */
+ if (is_dir) {
+ ASSERT(VFS_I(ip)->i_nlink >= 2);
+ if (VFS_I(ip)->i_nlink != 2) {
+ error = -ENOTEMPTY;
+ goto out_trans_cancel;
+ }
+ if (!xfs_dir_isempty(ip)) {
+ error = -ENOTEMPTY;
+ goto out_trans_cancel;
+ }
+
+ /* Drop the link from ip's "..". */
+ error = xfs_droplink(tp, dp);
+ if (error)
+ goto out_trans_cancel;
+
+ /* Drop the "." link from ip to self. */
+ error = xfs_droplink(tp, ip);
+ if (error)
+ goto out_trans_cancel;
+ } else {
+ /*
+ * When removing a non-directory we need to log the parent
+ * inode here. For a directory this is done implicitly
+ * by the xfs_droplink call for the ".." entry.
+ */
+ xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
+ }
+ xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
+
+ /* Drop the link from dp to ip. */
+ error = xfs_droplink(tp, ip);
+ if (error)
+ goto out_trans_cancel;
+
+ error = xfs_dir_removename(tp, dp, name, ip->i_ino, resblks);
+ if (error) {
+ ASSERT(error != -ENOENT);
+ goto out_trans_cancel;
+ }
+
+ /*
+ * If this is a synchronous mount, make sure that the
+ * remove transaction goes to disk before returning to
+ * the user.
+ */
+ if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
+ xfs_trans_set_sync(tp);
+
+ error = xfs_trans_commit(tp);
+ if (error)
+ goto std_return;
+
+ if (is_dir && xfs_inode_is_filestream(ip))
+ xfs_filestream_deassociate(ip);
+
+ return 0;
+
+ out_trans_cancel:
+ xfs_trans_cancel(tp);
+ std_return:
+ return error;
+}
+
+/*
+ * Enter all inodes for a rename transaction into a sorted array.
+ */
+#define __XFS_SORT_INODES 5
+STATIC void
+xfs_sort_for_rename(
+ struct xfs_inode *dp1, /* in: old (source) directory inode */
+ struct xfs_inode *dp2, /* in: new (target) directory inode */
+ struct xfs_inode *ip1, /* in: inode of old entry */
+ struct xfs_inode *ip2, /* in: inode of new entry */
+ struct xfs_inode *wip, /* in: whiteout inode */
+ struct xfs_inode **i_tab,/* out: sorted array of inodes */
+ int *num_inodes) /* in/out: inodes in array */
+{
+ int i, j;
+
+ ASSERT(*num_inodes == __XFS_SORT_INODES);
+ memset(i_tab, 0, *num_inodes * sizeof(struct xfs_inode *));
+
+ /*
+ * i_tab contains a list of pointers to inodes. We initialize
+ * the table here & we'll sort it. We will then use it to
+ * order the acquisition of the inode locks.
+ *
+ * Note that the table may contain duplicates. e.g., dp1 == dp2.
+ */
+ i = 0;
+ i_tab[i++] = dp1;
+ i_tab[i++] = dp2;
+ i_tab[i++] = ip1;
+ if (ip2)
+ i_tab[i++] = ip2;
+ if (wip)
+ i_tab[i++] = wip;
+ *num_inodes = i;
+
+ /*
+ * Sort the elements via bubble sort. (Remember, there are at
+ * most 5 elements to sort, so this is adequate.)
+ */
+ for (i = 0; i < *num_inodes; i++) {
+ for (j = 1; j < *num_inodes; j++) {
+ if (i_tab[j]->i_ino < i_tab[j-1]->i_ino) {
+ struct xfs_inode *temp = i_tab[j];
+ i_tab[j] = i_tab[j-1];
+ i_tab[j-1] = temp;
+ }
+ }
+ }
+}
+
+static int
+xfs_finish_rename(
+ struct xfs_trans *tp)
+{
+ /*
+ * If this is a synchronous mount, make sure that the rename transaction
+ * goes to disk before returning to the user.
+ */
+ if (tp->t_mountp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
+ xfs_trans_set_sync(tp);
+
+ return xfs_trans_commit(tp);
+}
+
+/*
+ * xfs_cross_rename()
+ *
+ * responsible for handling RENAME_EXCHANGE flag in renameat2() sytemcall
+ */
+STATIC int
+xfs_cross_rename(
+ struct xfs_trans *tp,
+ struct xfs_inode *dp1,
+ struct xfs_name *name1,
+ struct xfs_inode *ip1,
+ struct xfs_inode *dp2,
+ struct xfs_name *name2,
+ struct xfs_inode *ip2,
+ int spaceres)
+{
+ int error = 0;
+ int ip1_flags = 0;
+ int ip2_flags = 0;
+ int dp2_flags = 0;
+
+ /* Swap inode number for dirent in first parent */
+ error = xfs_dir_replace(tp, dp1, name1, ip2->i_ino, spaceres);
+ if (error)
+ goto out_trans_abort;
+
+ /* Swap inode number for dirent in second parent */
+ error = xfs_dir_replace(tp, dp2, name2, ip1->i_ino, spaceres);
+ if (error)
+ goto out_trans_abort;
+
+ /*
+ * If we're renaming one or more directories across different parents,
+ * update the respective ".." entries (and link counts) to match the new
+ * parents.
+ */
+ if (dp1 != dp2) {
+ dp2_flags = XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG;
+
+ if (S_ISDIR(VFS_I(ip2)->i_mode)) {
+ error = xfs_dir_replace(tp, ip2, &xfs_name_dotdot,
+ dp1->i_ino, spaceres);
+ if (error)
+ goto out_trans_abort;
+
+ /* transfer ip2 ".." reference to dp1 */
+ if (!S_ISDIR(VFS_I(ip1)->i_mode)) {
+ error = xfs_droplink(tp, dp2);
+ if (error)
+ goto out_trans_abort;
+ error = xfs_bumplink(tp, dp1);
+ if (error)
+ goto out_trans_abort;
+ }
+
+ /*
+ * Although ip1 isn't changed here, userspace needs
+ * to be warned about the change, so that applications
+ * relying on it (like backup ones), will properly
+ * notify the change
+ */
+ ip1_flags |= XFS_ICHGTIME_CHG;
+ ip2_flags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG;
+ }
+
+ if (S_ISDIR(VFS_I(ip1)->i_mode)) {
+ error = xfs_dir_replace(tp, ip1, &xfs_name_dotdot,
+ dp2->i_ino, spaceres);
+ if (error)
+ goto out_trans_abort;
+
+ /* transfer ip1 ".." reference to dp2 */
+ if (!S_ISDIR(VFS_I(ip2)->i_mode)) {
+ error = xfs_droplink(tp, dp1);
+ if (error)
+ goto out_trans_abort;
+ error = xfs_bumplink(tp, dp2);
+ if (error)
+ goto out_trans_abort;
+ }
+
+ /*
+ * Although ip2 isn't changed here, userspace needs
+ * to be warned about the change, so that applications
+ * relying on it (like backup ones), will properly
+ * notify the change
+ */
+ ip1_flags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG;
+ ip2_flags |= XFS_ICHGTIME_CHG;
+ }
+ }
+
+ if (ip1_flags) {
+ xfs_trans_ichgtime(tp, ip1, ip1_flags);
+ xfs_trans_log_inode(tp, ip1, XFS_ILOG_CORE);
+ }
+ if (ip2_flags) {
+ xfs_trans_ichgtime(tp, ip2, ip2_flags);
+ xfs_trans_log_inode(tp, ip2, XFS_ILOG_CORE);
+ }
+ if (dp2_flags) {
+ xfs_trans_ichgtime(tp, dp2, dp2_flags);
+ xfs_trans_log_inode(tp, dp2, XFS_ILOG_CORE);
+ }
+ xfs_trans_ichgtime(tp, dp1, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
+ xfs_trans_log_inode(tp, dp1, XFS_ILOG_CORE);
+ return xfs_finish_rename(tp);
+
+out_trans_abort:
+ xfs_trans_cancel(tp);
+ return error;
+}
+
+/*
+ * xfs_rename_alloc_whiteout()
+ *
+ * Return a referenced, unlinked, unlocked inode that that can be used as a
+ * whiteout in a rename transaction. We use a tmpfile inode here so that if we
+ * crash between allocating the inode and linking it into the rename transaction
+ * recovery will free the inode and we won't leak it.
+ */
+static int
+xfs_rename_alloc_whiteout(
+ struct xfs_inode *dp,
+ struct xfs_inode **wip)
+{
+ struct xfs_inode *tmpfile;
+ int error;
+
+ error = xfs_create_tmpfile(dp, S_IFCHR | WHITEOUT_MODE, &tmpfile);
+ if (error)
+ return error;
+
+ /*
+ * Prepare the tmpfile inode as if it were created through the VFS.
+ * Otherwise, the link increment paths will complain about nlink 0->1.
+ * Drop the link count as done by d_tmpfile(), complete the inode setup
+ * and flag it as linkable.
+ */
+ drop_nlink(VFS_I(tmpfile));
+ xfs_setup_iops(tmpfile);
+ xfs_finish_inode_setup(tmpfile);
+ VFS_I(tmpfile)->i_state |= I_LINKABLE;
+
+ *wip = tmpfile;
+ return 0;
+}
+
+/*
+ * xfs_rename
+ */
+int
+xfs_rename(
+ struct xfs_inode *src_dp,
+ struct xfs_name *src_name,
+ struct xfs_inode *src_ip,
+ struct xfs_inode *target_dp,
+ struct xfs_name *target_name,
+ struct xfs_inode *target_ip,
+ unsigned int flags)
+{
+ struct xfs_mount *mp = src_dp->i_mount;
+ struct xfs_trans *tp;
+ struct xfs_inode *wip = NULL; /* whiteout inode */
+ struct xfs_inode *inodes[__XFS_SORT_INODES];
+ int num_inodes = __XFS_SORT_INODES;
+ bool new_parent = (src_dp != target_dp);
+ bool src_is_directory = S_ISDIR(VFS_I(src_ip)->i_mode);
+ int spaceres;
+ int error;
+
+ trace_xfs_rename(src_dp, target_dp, src_name, target_name);
+
+ if ((flags & RENAME_EXCHANGE) && !target_ip)
+ return -EINVAL;
+
+ /*
+ * If we are doing a whiteout operation, allocate the whiteout inode
+ * we will be placing at the target and ensure the type is set
+ * appropriately.
+ */
+ if (flags & RENAME_WHITEOUT) {
+ ASSERT(!(flags & (RENAME_NOREPLACE | RENAME_EXCHANGE)));
+ error = xfs_rename_alloc_whiteout(target_dp, &wip);
+ if (error)
+ return error;
+
+ /* setup target dirent info as whiteout */
+ src_name->type = XFS_DIR3_FT_CHRDEV;
+ }
+
+ xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip, wip,
+ inodes, &num_inodes);
+
+ spaceres = XFS_RENAME_SPACE_RES(mp, target_name->len);
+ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_rename, spaceres, 0, 0, &tp);
+ if (error == -ENOSPC) {
+ spaceres = 0;
+ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_rename, 0, 0, 0,
+ &tp);
+ }
+ if (error)
+ goto out_release_wip;
+
+ /*
+ * Attach the dquots to the inodes
+ */
+ error = xfs_qm_vop_rename_dqattach(inodes);
+ if (error)
+ goto out_trans_cancel;
+
+ /*
+ * Lock all the participating inodes. Depending upon whether
+ * the target_name exists in the target directory, and
+ * whether the target directory is the same as the source
+ * directory, we can lock from 2 to 4 inodes.
+ */
+ xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL);
+
+ /*
+ * Join all the inodes to the transaction. From this point on,
+ * we can rely on either trans_commit or trans_cancel to unlock
+ * them.
+ */
+ xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL);
+ if (new_parent)
+ xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL);
+ if (target_ip)
+ xfs_trans_ijoin(tp, target_ip, XFS_ILOCK_EXCL);
+ if (wip)
+ xfs_trans_ijoin(tp, wip, XFS_ILOCK_EXCL);
+
+ /*
+ * If we are using project inheritance, we only allow renames
+ * into our tree when the project IDs are the same; else the
+ * tree quota mechanism would be circumvented.
+ */
+ if (unlikely((target_dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
+ (xfs_get_projid(target_dp) != xfs_get_projid(src_ip)))) {
+ error = -EXDEV;
+ goto out_trans_cancel;
+ }
+
+ /* RENAME_EXCHANGE is unique from here on. */
+ if (flags & RENAME_EXCHANGE)
+ return xfs_cross_rename(tp, src_dp, src_name, src_ip,
+ target_dp, target_name, target_ip,
+ spaceres);
+
+ /*
+ * Set up the target.
+ */
+ if (target_ip == NULL) {
+ /*
+ * If there's no space reservation, check the entry will
+ * fit before actually inserting it.
+ */
+ if (!spaceres) {
+ error = xfs_dir_canenter(tp, target_dp, target_name);
+ if (error)
+ goto out_trans_cancel;
+ }
+ /*
+ * If target does not exist and the rename crosses
+ * directories, adjust the target directory link count
+ * to account for the ".." reference from the new entry.
+ */
+ error = xfs_dir_createname(tp, target_dp, target_name,
+ src_ip->i_ino, spaceres);
+ if (error)
+ goto out_trans_cancel;
+
+ xfs_trans_ichgtime(tp, target_dp,
+ XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
+
+ if (new_parent && src_is_directory) {
+ error = xfs_bumplink(tp, target_dp);
+ if (error)
+ goto out_trans_cancel;
+ }
+ } else { /* target_ip != NULL */
+ /*
+ * If target exists and it's a directory, check that both
+ * target and source are directories and that target can be
+ * destroyed, or that neither is a directory.
+ */
+ if (S_ISDIR(VFS_I(target_ip)->i_mode)) {
+ /*
+ * Make sure target dir is empty.
+ */
+ if (!(xfs_dir_isempty(target_ip)) ||
+ (VFS_I(target_ip)->i_nlink > 2)) {
+ error = -EEXIST;
+ goto out_trans_cancel;
+ }
+ }
+
+ /*
+ * Link the source inode under the target name.
+ * If the source inode is a directory and we are moving
+ * it across directories, its ".." entry will be
+ * inconsistent until we replace that down below.
+ *
+ * In case there is already an entry with the same
+ * name at the destination directory, remove it first.
+ */
+ error = xfs_dir_replace(tp, target_dp, target_name,
+ src_ip->i_ino, spaceres);
+ if (error)
+ goto out_trans_cancel;
+
+ xfs_trans_ichgtime(tp, target_dp,
+ XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
+
+ /*
+ * Decrement the link count on the target since the target
+ * dir no longer points to it.
+ */
+ error = xfs_droplink(tp, target_ip);
+ if (error)
+ goto out_trans_cancel;
+
+ if (src_is_directory) {
+ /*
+ * Drop the link from the old "." entry.
+ */
+ error = xfs_droplink(tp, target_ip);
+ if (error)
+ goto out_trans_cancel;
+ }
+ } /* target_ip != NULL */
+
+ /*
+ * Remove the source.
+ */
+ if (new_parent && src_is_directory) {
+ /*
+ * Rewrite the ".." entry to point to the new
+ * directory.
+ */
+ error = xfs_dir_replace(tp, src_ip, &xfs_name_dotdot,
+ target_dp->i_ino, spaceres);
+ ASSERT(error != -EEXIST);
+ if (error)
+ goto out_trans_cancel;
+ }
+
+ /*
+ * We always want to hit the ctime on the source inode.
+ *
+ * This isn't strictly required by the standards since the source
+ * inode isn't really being changed, but old unix file systems did
+ * it and some incremental backup programs won't work without it.
+ */
+ xfs_trans_ichgtime(tp, src_ip, XFS_ICHGTIME_CHG);
+ xfs_trans_log_inode(tp, src_ip, XFS_ILOG_CORE);
+
+ /*
+ * Adjust the link count on src_dp. This is necessary when
+ * renaming a directory, either within one parent when
+ * the target existed, or across two parent directories.
+ */
+ if (src_is_directory && (new_parent || target_ip != NULL)) {
+
+ /*
+ * Decrement link count on src_directory since the
+ * entry that's moved no longer points to it.
+ */
+ error = xfs_droplink(tp, src_dp);
+ if (error)
+ goto out_trans_cancel;
+ }
+
+ /*
+ * For whiteouts, we only need to update the source dirent with the
+ * inode number of the whiteout inode rather than removing it
+ * altogether.
+ */
+ if (wip) {
+ error = xfs_dir_replace(tp, src_dp, src_name, wip->i_ino,
+ spaceres);
+ } else
+ error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino,
+ spaceres);
+ if (error)
+ goto out_trans_cancel;
+
+ /*
+ * For whiteouts, we need to bump the link count on the whiteout inode.
+ * This means that failures all the way up to this point leave the inode
+ * on the unlinked list and so cleanup is a simple matter of dropping
+ * the remaining reference to it. If we fail here after bumping the link
+ * count, we're shutting down the filesystem so we'll never see the
+ * intermediate state on disk.
+ */
+ if (wip) {
+ ASSERT(VFS_I(wip)->i_nlink == 0);
+ error = xfs_bumplink(tp, wip);
+ if (error)
+ goto out_trans_cancel;
+ error = xfs_iunlink_remove(tp, wip);
+ if (error)
+ goto out_trans_cancel;
+ xfs_trans_log_inode(tp, wip, XFS_ILOG_CORE);
+
+ /*
+ * Now we have a real link, clear the "I'm a tmpfile" state
+ * flag from the inode so it doesn't accidentally get misused in
+ * future.
+ */
+ VFS_I(wip)->i_state &= ~I_LINKABLE;
+ }
+
+ xfs_trans_ichgtime(tp, src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
+ xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE);
+ if (new_parent)
+ xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE);
+
+ error = xfs_finish_rename(tp);
+ if (wip)
+ xfs_irele(wip);
+ return error;
+
+out_trans_cancel:
+ xfs_trans_cancel(tp);
+out_release_wip:
+ if (wip)
+ xfs_irele(wip);
+ return error;
+}
+
+STATIC int
+xfs_iflush_cluster(
+ struct xfs_inode *ip,
+ struct xfs_buf *bp)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_perag *pag;
+ unsigned long first_index, mask;
+ unsigned long inodes_per_cluster;
+ int cilist_size;
+ struct xfs_inode **cilist;
+ struct xfs_inode *cip;
+ int nr_found;
+ int clcount = 0;
+ int i;
+
+ pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
+
+ inodes_per_cluster = mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog;
+ cilist_size = inodes_per_cluster * sizeof(xfs_inode_t *);
+ cilist = kmem_alloc(cilist_size, KM_MAYFAIL|KM_NOFS);
+ if (!cilist)
+ goto out_put;
+
+ mask = ~(((mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog)) - 1);
+ first_index = XFS_INO_TO_AGINO(mp, ip->i_ino) & mask;
+ rcu_read_lock();
+ /* really need a gang lookup range call here */
+ nr_found = radix_tree_gang_lookup(&pag->pag_ici_root, (void**)cilist,
+ first_index, inodes_per_cluster);
+ if (nr_found == 0)
+ goto out_free;
+
+ for (i = 0; i < nr_found; i++) {
+ cip = cilist[i];
+ if (cip == ip)
+ continue;
+
+ /*
+ * because this is an RCU protected lookup, we could find a
+ * recently freed or even reallocated inode during the lookup.
+ * We need to check under the i_flags_lock for a valid inode
+ * here. Skip it if it is not valid or the wrong inode.
+ */
+ spin_lock(&cip->i_flags_lock);
+ if (!cip->i_ino ||
+ __xfs_iflags_test(cip, XFS_ISTALE)) {
+ spin_unlock(&cip->i_flags_lock);
+ continue;
+ }
+
+ /*
+ * Once we fall off the end of the cluster, no point checking
+ * any more inodes in the list because they will also all be
+ * outside the cluster.
+ */
+ if ((XFS_INO_TO_AGINO(mp, cip->i_ino) & mask) != first_index) {
+ spin_unlock(&cip->i_flags_lock);
+ break;
+ }
+ spin_unlock(&cip->i_flags_lock);
+
+ /*
+ * Do an un-protected check to see if the inode is dirty and
+ * is a candidate for flushing. These checks will be repeated
+ * later after the appropriate locks are acquired.
+ */
+ if (xfs_inode_clean(cip) && xfs_ipincount(cip) == 0)
+ continue;
+
+ /*
+ * Try to get locks. If any are unavailable or it is pinned,
+ * then this inode cannot be flushed and is skipped.
+ */
+
+ if (!xfs_ilock_nowait(cip, XFS_ILOCK_SHARED))
+ continue;
+ if (!xfs_iflock_nowait(cip)) {
+ xfs_iunlock(cip, XFS_ILOCK_SHARED);
+ continue;
+ }
+ if (xfs_ipincount(cip)) {
+ xfs_ifunlock(cip);
+ xfs_iunlock(cip, XFS_ILOCK_SHARED);
+ continue;
+ }
+
+
+ /*
+ * Check the inode number again, just to be certain we are not
+ * racing with freeing in xfs_reclaim_inode(). See the comments
+ * in that function for more information as to why the initial
+ * check is not sufficient.
+ */
+ if (!cip->i_ino) {
+ xfs_ifunlock(cip);
+ xfs_iunlock(cip, XFS_ILOCK_SHARED);
+ continue;
+ }
+
+ /*
+ * arriving here means that this inode can be flushed. First
+ * re-check that it's dirty before flushing.
+ */
+ if (!xfs_inode_clean(cip)) {
+ int error;
+ error = xfs_iflush_int(cip, bp);
+ if (error) {
+ xfs_iunlock(cip, XFS_ILOCK_SHARED);
+ goto cluster_corrupt_out;
+ }
+ clcount++;
+ } else {
+ xfs_ifunlock(cip);
+ }
+ xfs_iunlock(cip, XFS_ILOCK_SHARED);
+ }
+
+ if (clcount) {
+ XFS_STATS_INC(mp, xs_icluster_flushcnt);
+ XFS_STATS_ADD(mp, xs_icluster_flushinode, clcount);
+ }
+
+out_free:
+ rcu_read_unlock();
+ kmem_free(cilist);
+out_put:
+ xfs_perag_put(pag);
+ return 0;
+
+
+cluster_corrupt_out:
+ /*
+ * Corruption detected in the clustering loop. Invalidate the
+ * inode buffer and shut down the filesystem.
+ */
+ rcu_read_unlock();
+ xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
+
+ /*
+ * We'll always have an inode attached to the buffer for completion
+ * process by the time we are called from xfs_iflush(). Hence we have
+ * always need to do IO completion processing to abort the inodes
+ * attached to the buffer. handle them just like the shutdown case in
+ * xfs_buf_submit().
+ */
+ ASSERT(bp->b_iodone);
+ bp->b_flags &= ~XBF_DONE;
+ xfs_buf_stale(bp);
+ xfs_buf_ioerror(bp, -EIO);
+ xfs_buf_ioend(bp);
+
+ /* abort the corrupt inode, as it was not attached to the buffer */
+ xfs_iflush_abort(cip, false);
+ kmem_free(cilist);
+ xfs_perag_put(pag);
+ return -EFSCORRUPTED;
+}
+
+/*
+ * Flush dirty inode metadata into the backing buffer.
+ *
+ * The caller must have the inode lock and the inode flush lock held. The
+ * inode lock will still be held upon return to the caller, and the inode
+ * flush lock will be released after the inode has reached the disk.
+ *
+ * The caller must write out the buffer returned in *bpp and release it.
+ */
+int
+xfs_iflush(
+ struct xfs_inode *ip,
+ struct xfs_buf **bpp)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_buf *bp = NULL;
+ struct xfs_dinode *dip;
+ int error;
+
+ XFS_STATS_INC(mp, xs_iflush_count);
+
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
+ ASSERT(xfs_isiflocked(ip));
+ ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
+ ip->i_d.di_nextents > XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK));
+
+ *bpp = NULL;
+
+ xfs_iunpin_wait(ip);
+
+ /*
+ * For stale inodes we cannot rely on the backing buffer remaining
+ * stale in cache for the remaining life of the stale inode and so
+ * xfs_imap_to_bp() below may give us a buffer that no longer contains
+ * inodes below. We have to check this after ensuring the inode is
+ * unpinned so that it is safe to reclaim the stale inode after the
+ * flush call.
+ */
+ if (xfs_iflags_test(ip, XFS_ISTALE)) {
+ xfs_ifunlock(ip);
+ return 0;
+ }
+
+ /*
+ * This may have been unpinned because the filesystem is shutting
+ * down forcibly. If that's the case we must not write this inode
+ * to disk, because the log record didn't make it to disk.
+ *
+ * We also have to remove the log item from the AIL in this case,
+ * as we wait for an empty AIL as part of the unmount process.
+ */
+ if (XFS_FORCED_SHUTDOWN(mp)) {
+ error = -EIO;
+ goto abort_out;
+ }
+
+ /*
+ * Get the buffer containing the on-disk inode. We are doing a try-lock
+ * operation here, so we may get an EAGAIN error. In that case, we
+ * simply want to return with the inode still dirty.
+ *
+ * If we get any other error, we effectively have a corruption situation
+ * and we cannot flush the inode, so we treat it the same as failing
+ * xfs_iflush_int().
+ */
+ error = xfs_imap_to_bp(mp, NULL, &ip->i_imap, &dip, &bp, XBF_TRYLOCK,
+ 0);
+ if (error == -EAGAIN) {
+ xfs_ifunlock(ip);
+ return error;
+ }
+ if (error)
+ goto corrupt_out;
+
+ /*
+ * First flush out the inode that xfs_iflush was called with.
+ */
+ error = xfs_iflush_int(ip, bp);
+ if (error)
+ goto corrupt_out;
+
+ /*
+ * If the buffer is pinned then push on the log now so we won't
+ * get stuck waiting in the write for too long.
+ */
+ if (xfs_buf_ispinned(bp))
+ xfs_log_force(mp, 0);
+
+ /*
+ * inode clustering: try to gather other inodes into this write
+ *
+ * Note: Any error during clustering will result in the filesystem
+ * being shut down and completion callbacks run on the cluster buffer.
+ * As we have already flushed and attached this inode to the buffer,
+ * it has already been aborted and released by xfs_iflush_cluster() and
+ * so we have no further error handling to do here.
+ */
+ error = xfs_iflush_cluster(ip, bp);
+ if (error)
+ return error;
+
+ *bpp = bp;
+ return 0;
+
+corrupt_out:
+ if (bp)
+ xfs_buf_relse(bp);
+ xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
+abort_out:
+ /* abort the corrupt inode, as it was not attached to the buffer */
+ xfs_iflush_abort(ip, false);
+ return error;
+}
+
+/*
+ * If there are inline format data / attr forks attached to this inode,
+ * make sure they're not corrupt.
+ */
+bool
+xfs_inode_verify_forks(
+ struct xfs_inode *ip)
+{
+ struct xfs_ifork *ifp;
+ xfs_failaddr_t fa;
+
+ fa = xfs_ifork_verify_data(ip, &xfs_default_ifork_ops);
+ if (fa) {
+ ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
+ xfs_inode_verifier_error(ip, -EFSCORRUPTED, "data fork",
+ ifp->if_u1.if_data, ifp->if_bytes, fa);
+ return false;
+ }
+
+ fa = xfs_ifork_verify_attr(ip, &xfs_default_ifork_ops);
+ if (fa) {
+ ifp = XFS_IFORK_PTR(ip, XFS_ATTR_FORK);
+ xfs_inode_verifier_error(ip, -EFSCORRUPTED, "attr fork",
+ ifp ? ifp->if_u1.if_data : NULL,
+ ifp ? ifp->if_bytes : 0, fa);
+ return false;
+ }
+ return true;
+}
+
+STATIC int
+xfs_iflush_int(
+ struct xfs_inode *ip,
+ struct xfs_buf *bp)
+{
+ struct xfs_inode_log_item *iip = ip->i_itemp;
+ struct xfs_dinode *dip;
+ struct xfs_mount *mp = ip->i_mount;
+
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
+ ASSERT(xfs_isiflocked(ip));
+ ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
+ ip->i_d.di_nextents > XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK));
+ ASSERT(iip != NULL && iip->ili_fields != 0);
+ ASSERT(ip->i_d.di_version > 1);
+
+ /* set *dip = inode's place in the buffer */
+ dip = xfs_buf_offset(bp, ip->i_imap.im_boffset);
+
+ if (XFS_TEST_ERROR(dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC),
+ mp, XFS_ERRTAG_IFLUSH_1)) {
+ xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
+ "%s: Bad inode %Lu magic number 0x%x, ptr "PTR_FMT,
+ __func__, ip->i_ino, be16_to_cpu(dip->di_magic), dip);
+ goto corrupt_out;
+ }
+ if (S_ISREG(VFS_I(ip)->i_mode)) {
+ if (XFS_TEST_ERROR(
+ (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) &&
+ (ip->i_d.di_format != XFS_DINODE_FMT_BTREE),
+ mp, XFS_ERRTAG_IFLUSH_3)) {
+ xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
+ "%s: Bad regular inode %Lu, ptr "PTR_FMT,
+ __func__, ip->i_ino, ip);
+ goto corrupt_out;
+ }
+ } else if (S_ISDIR(VFS_I(ip)->i_mode)) {
+ if (XFS_TEST_ERROR(
+ (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) &&
+ (ip->i_d.di_format != XFS_DINODE_FMT_BTREE) &&
+ (ip->i_d.di_format != XFS_DINODE_FMT_LOCAL),
+ mp, XFS_ERRTAG_IFLUSH_4)) {
+ xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
+ "%s: Bad directory inode %Lu, ptr "PTR_FMT,
+ __func__, ip->i_ino, ip);
+ goto corrupt_out;
+ }
+ }
+ if (XFS_TEST_ERROR(ip->i_d.di_nextents + ip->i_d.di_anextents >
+ ip->i_d.di_nblocks, mp, XFS_ERRTAG_IFLUSH_5)) {
+ xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
+ "%s: detected corrupt incore inode %Lu, "
+ "total extents = %d, nblocks = %Ld, ptr "PTR_FMT,
+ __func__, ip->i_ino,
+ ip->i_d.di_nextents + ip->i_d.di_anextents,
+ ip->i_d.di_nblocks, ip);
+ goto corrupt_out;
+ }
+ if (XFS_TEST_ERROR(ip->i_d.di_forkoff > mp->m_sb.sb_inodesize,
+ mp, XFS_ERRTAG_IFLUSH_6)) {
+ xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
+ "%s: bad inode %Lu, forkoff 0x%x, ptr "PTR_FMT,
+ __func__, ip->i_ino, ip->i_d.di_forkoff, ip);
+ goto corrupt_out;
+ }
+
+ /*
+ * Inode item log recovery for v2 inodes are dependent on the
+ * di_flushiter count for correct sequencing. We bump the flush
+ * iteration count so we can detect flushes which postdate a log record
+ * during recovery. This is redundant as we now log every change and
+ * hence this can't happen but we need to still do it to ensure
+ * backwards compatibility with old kernels that predate logging all
+ * inode changes.
+ */
+ if (ip->i_d.di_version < 3)
+ ip->i_d.di_flushiter++;
+
+ /* Check the inline fork data before we write out. */
+ if (!xfs_inode_verify_forks(ip))
+ goto corrupt_out;
+
+ /*
+ * Copy the dirty parts of the inode into the on-disk inode. We always
+ * copy out the core of the inode, because if the inode is dirty at all
+ * the core must be.
+ */
+ xfs_inode_to_disk(ip, dip, iip->ili_item.li_lsn);
+
+ /* Wrap, we never let the log put out DI_MAX_FLUSH */
+ if (ip->i_d.di_flushiter == DI_MAX_FLUSH)
+ ip->i_d.di_flushiter = 0;
+
+ xfs_iflush_fork(ip, dip, iip, XFS_DATA_FORK);
+ if (XFS_IFORK_Q(ip))
+ xfs_iflush_fork(ip, dip, iip, XFS_ATTR_FORK);
+ xfs_inobp_check(mp, bp);
+
+ /*
+ * We've recorded everything logged in the inode, so we'd like to clear
+ * the ili_fields bits so we don't log and flush things unnecessarily.
+ * However, we can't stop logging all this information until the data
+ * we've copied into the disk buffer is written to disk. If we did we
+ * might overwrite the copy of the inode in the log with all the data
+ * after re-logging only part of it, and in the face of a crash we
+ * wouldn't have all the data we need to recover.
+ *
+ * What we do is move the bits to the ili_last_fields field. When
+ * logging the inode, these bits are moved back to the ili_fields field.
+ * In the xfs_iflush_done() routine we clear ili_last_fields, since we
+ * know that the information those bits represent is permanently on
+ * disk. As long as the flush completes before the inode is logged
+ * again, then both ili_fields and ili_last_fields will be cleared.
+ *
+ * We can play with the ili_fields bits here, because the inode lock
+ * must be held exclusively in order to set bits there and the flush
+ * lock protects the ili_last_fields bits. Set ili_logged so the flush
+ * done routine can tell whether or not to look in the AIL. Also, store
+ * the current LSN of the inode so that we can tell whether the item has
+ * moved in the AIL from xfs_iflush_done(). In order to read the lsn we
+ * need the AIL lock, because it is a 64 bit value that cannot be read
+ * atomically.
+ */
+ iip->ili_last_fields = iip->ili_fields;
+ iip->ili_fields = 0;
+ iip->ili_fsync_fields = 0;
+ iip->ili_logged = 1;
+
+ xfs_trans_ail_copy_lsn(mp->m_ail, &iip->ili_flush_lsn,
+ &iip->ili_item.li_lsn);
+
+ /*
+ * Attach the function xfs_iflush_done to the inode's
+ * buffer. This will remove the inode from the AIL
+ * and unlock the inode's flush lock when the inode is
+ * completely written to disk.
+ */
+ xfs_buf_attach_iodone(bp, xfs_iflush_done, &iip->ili_item);
+
+ /* generate the checksum. */
+ xfs_dinode_calc_crc(mp, dip);
+
+ ASSERT(!list_empty(&bp->b_li_list));
+ ASSERT(bp->b_iodone != NULL);
+ return 0;
+
+corrupt_out:
+ return -EFSCORRUPTED;
+}
+
+/* Release an inode. */
+void
+xfs_irele(
+ struct xfs_inode *ip)
+{
+ trace_xfs_irele(ip, _RET_IP_);
+ iput(VFS_I(ip));
+}