return error;
}
-/*
- * This is a wrapper routine around the xfs_ilock() routine
- * used to centralize some grungy code. It is used in places
- * that wish to lock the inode solely for reading the extents.
- * The reason these places can't just call 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 function returns a value which should be given to the
- * corresponding xfs_iunlock_map_shared(). This value is
- * the mode in which the lock was actually taken.
- */
-uint
-xfs_ilock_map_shared(
- xfs_inode_t *ip)
-{
- uint lock_mode;
-
- if ((ip->i_d.di_format == XFS_DINODE_FMT_BTREE) &&
- ((ip->i_df.if_flags & XFS_IFEXTENTS) == 0)) {
- lock_mode = XFS_ILOCK_EXCL;
- } else {
- lock_mode = XFS_ILOCK_SHARED;
- }
-
- xfs_ilock(ip, lock_mode);
-
- return lock_mode;
-}
-
-/*
- * This is simply the unlock routine to go with xfs_ilock_map_shared().
- * All it does is call xfs_iunlock() with the given lock_mode.
- */
-void
-xfs_iunlock_map_shared(
- xfs_inode_t *ip,
- unsigned int lock_mode)
-{
- xfs_iunlock(ip, lock_mode);
-}
-
-/*
- * The xfs inode contains 2 locks: a multi-reader lock called the
- * i_iolock and a multi-reader lock called the i_lock. This routine
- * allows either or both of the locks to be obtained.
- *
- * The 2 locks should always be ordered so that the IO lock is
- * obtained first in order to prevent deadlock.
- *
- * ip -- the inode being locked
- * lock_flags -- this parameter indicates the inode's locks
- * to be locked. It can be:
- * XFS_IOLOCK_SHARED,
- * XFS_IOLOCK_EXCL,
- * XFS_ILOCK_SHARED,
- * XFS_ILOCK_EXCL,
- * XFS_IOLOCK_SHARED | XFS_ILOCK_SHARED,
- * XFS_IOLOCK_SHARED | XFS_ILOCK_EXCL,
- * XFS_IOLOCK_EXCL | XFS_ILOCK_SHARED,
- * XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL
- */
-void
-xfs_ilock(
- 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_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
- (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
- ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
-
- if (lock_flags & XFS_IOLOCK_EXCL)
- mrupdate_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags));
- else if (lock_flags & XFS_IOLOCK_SHARED)
- mraccess_nested(&ip->i_iolock, XFS_IOLOCK_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));
-
- trace_xfs_ilock(ip, lock_flags, _RET_IP_);
-}
-
-/*
- * 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)
-{
- /*
- * 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_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
- (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
- ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
-
- if (lock_flags & XFS_IOLOCK_EXCL) {
- if (!mrtryupdate(&ip->i_iolock))
- goto out;
- } else if (lock_flags & XFS_IOLOCK_SHARED) {
- if (!mrtryaccess(&ip->i_iolock))
- goto out;
- }
- if (lock_flags & XFS_ILOCK_EXCL) {
- if (!mrtryupdate(&ip->i_lock))
- goto out_undo_iolock;
- } else if (lock_flags & XFS_ILOCK_SHARED) {
- if (!mrtryaccess(&ip->i_lock))
- goto out_undo_iolock;
- }
- trace_xfs_ilock_nowait(ip, lock_flags, _RET_IP_);
- return 1;
-
- out_undo_iolock:
- if (lock_flags & XFS_IOLOCK_EXCL)
- mrunlock_excl(&ip->i_iolock);
- else if (lock_flags & XFS_IOLOCK_SHARED)
- mrunlock_shared(&ip->i_iolock);
- 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_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
- (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
- ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
- ASSERT(lock_flags != 0);
-
- if (lock_flags & XFS_IOLOCK_EXCL)
- mrunlock_excl(&ip->i_iolock);
- else if (lock_flags & XFS_IOLOCK_SHARED)
- mrunlock_shared(&ip->i_iolock);
-
- 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_ILOCK_EXCL));
- ASSERT((lock_flags & ~(XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)) == 0);
-
- if (lock_flags & XFS_ILOCK_EXCL)
- mrdemote(&ip->i_lock);
- if (lock_flags & XFS_IOLOCK_EXCL)
- mrdemote(&ip->i_iolock);
-
- trace_xfs_ilock_demote(ip, lock_flags, _RET_IP_);
-}
-
-#ifdef DEBUG
-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_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) {
- if (!(lock_flags & XFS_IOLOCK_SHARED))
- return !!ip->i_iolock.mr_writer;
- return rwsem_is_locked(&ip->i_iolock.mr_lock);
- }
-
- ASSERT(0);
- return 0;
-}
-#endif
-
-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.wait, TASK_UNINTERRUPTIBLE);
- if (xfs_isiflocked(ip))
- io_schedule();
- } while (!xfs_iflock_nowait(ip));
-
- finish_wait(wq, &wait.wait);
-}
return 0;
}
+/*
+ * This is a wrapper routine around the xfs_ilock() routine used to centralize
+ * some grungy code. It is used in places that wish to lock the inode solely
+ * for reading the extents. The reason these places can't just call
+ * 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 function returns a value which should be given to the corresponding
+ * xfs_iunlock_map_shared(). This value is the mode in which the lock was
+ * actually taken.
+ */
+uint
+xfs_ilock_map_shared(
+ xfs_inode_t *ip)
+{
+ uint lock_mode;
+
+ if ((ip->i_d.di_format == XFS_DINODE_FMT_BTREE) &&
+ ((ip->i_df.if_flags & XFS_IFEXTENTS) == 0)) {
+ lock_mode = XFS_ILOCK_EXCL;
+ } else {
+ lock_mode = XFS_ILOCK_SHARED;
+ }
+
+ xfs_ilock(ip, lock_mode);
+
+ return lock_mode;
+}
+
+/*
+ * This is simply the unlock routine to go with xfs_ilock_map_shared().
+ * All it does is call xfs_iunlock() with the given lock_mode.
+ */
+void
+xfs_iunlock_map_shared(
+ xfs_inode_t *ip,
+ unsigned int lock_mode)
+{
+ xfs_iunlock(ip, lock_mode);
+}
+
+/*
+ * The xfs inode contains 2 locks: a multi-reader lock called the
+ * i_iolock and a multi-reader lock called the i_lock. This routine
+ * allows either or both of the locks to be obtained.
+ *
+ * The 2 locks should always be ordered so that the IO lock is
+ * obtained first in order to prevent deadlock.
+ *
+ * ip -- the inode being locked
+ * lock_flags -- this parameter indicates the inode's locks
+ * to be locked. It can be:
+ * XFS_IOLOCK_SHARED,
+ * XFS_IOLOCK_EXCL,
+ * XFS_ILOCK_SHARED,
+ * XFS_ILOCK_EXCL,
+ * XFS_IOLOCK_SHARED | XFS_ILOCK_SHARED,
+ * XFS_IOLOCK_SHARED | XFS_ILOCK_EXCL,
+ * XFS_IOLOCK_EXCL | XFS_ILOCK_SHARED,
+ * XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL
+ */
+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_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
+ (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
+ ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
+
+ if (lock_flags & XFS_IOLOCK_EXCL)
+ mrupdate_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags));
+ else if (lock_flags & XFS_IOLOCK_SHARED)
+ mraccess_nested(&ip->i_iolock, XFS_IOLOCK_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_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
+ (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
+ ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
+
+ if (lock_flags & XFS_IOLOCK_EXCL) {
+ if (!mrtryupdate(&ip->i_iolock))
+ goto out;
+ } else if (lock_flags & XFS_IOLOCK_SHARED) {
+ if (!mrtryaccess(&ip->i_iolock))
+ goto out;
+ }
+ if (lock_flags & XFS_ILOCK_EXCL) {
+ if (!mrtryupdate(&ip->i_lock))
+ goto out_undo_iolock;
+ } else if (lock_flags & XFS_ILOCK_SHARED) {
+ if (!mrtryaccess(&ip->i_lock))
+ goto out_undo_iolock;
+ }
+ return 1;
+
+ out_undo_iolock:
+ if (lock_flags & XFS_IOLOCK_EXCL)
+ mrunlock_excl(&ip->i_iolock);
+ else if (lock_flags & XFS_IOLOCK_SHARED)
+ mrunlock_shared(&ip->i_iolock);
+ 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_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
+ (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
+ ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
+ ASSERT(lock_flags != 0);
+
+ if (lock_flags & XFS_IOLOCK_EXCL)
+ mrunlock_excl(&ip->i_iolock);
+ else if (lock_flags & XFS_IOLOCK_SHARED)
+ mrunlock_shared(&ip->i_iolock);
+
+ 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_ILOCK_EXCL));
+ ASSERT((lock_flags & ~(XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)) == 0);
+
+ if (lock_flags & XFS_ILOCK_EXCL)
+ mrdemote(&ip->i_lock);
+ if (lock_flags & XFS_IOLOCK_EXCL)
+ mrdemote(&ip->i_iolock);
+
+ trace_xfs_ilock_demote(ip, lock_flags, _RET_IP_);
+}
+
+#ifdef DEBUG
+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_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) {
+ if (!(lock_flags & XFS_IOLOCK_SHARED))
+ return !!ip->i_iolock.mr_writer;
+ return rwsem_is_locked(&ip->i_iolock.mr_lock);
+ }
+
+ ASSERT(0);
+ return 0;
+}
+#endif
+
+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.wait, TASK_UNINTERRUPTIBLE);
+ if (xfs_isiflocked(ip))
+ io_schedule();
+ } while (!xfs_iflock_nowait(ip));
+
+ finish_wait(wq, &wait.wait);
+}
+
#ifdef DEBUG
/*
* Make sure that the extents in the given memory buffer
projects / platform / upstream / kernel-adaptation-pc.git / commitdiff