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authorChristoph Hellwig <hch@infradead.org>2009-08-16 20:36:34 -0400
committerFelix Blyakher <felixb@sgi.com>2009-08-17 01:23:48 -0500
commitbc990f5cb424cdca9dda866785d088e2c2110ecc (patch)
tree4264beb9538533d136e41f0e93933160fe925008 /fs/xfs/xfs_iget.c
parent894ef820b10d77e2d6d717342fc408bdd9825139 (diff)
xfs: fix locking in xfs_iget_cache_hit
The locking in xfs_iget_cache_hit currently has numerous problems: - we clear the reclaim tag without i_flags_lock which protects modifications to it - we call inode_init_always which can sleep with pag_ici_lock held (this is oss.sgi.com BZ #819) - we acquire and drop i_flags_lock a lot and thus provide no consistency between the various flags we set/clear under it This patch fixes all that with a major revamp of the locking in the function. The new version acquires i_flags_lock early and only drops it once we need to call into inode_init_always or before calling xfs_ilock. This patch fixes a bug seen in the wild where we race modifying the reclaim tag. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Felix Blyakher <felixb@sgi.com> Reviewed-by: Eric Sandeen <sandeen@sandeen.net> Signed-off-by: Felix Blyakher <felixb@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_iget.c')
-rw-r--r--fs/xfs/xfs_iget.c113
1 files changed, 58 insertions, 55 deletions
diff --git a/fs/xfs/xfs_iget.c b/fs/xfs/xfs_iget.c
index 34ec86923f7..ecbf8b4d2e2 100644
--- a/fs/xfs/xfs_iget.c
+++ b/fs/xfs/xfs_iget.c
@@ -191,80 +191,82 @@ xfs_iget_cache_hit(
int flags,
int lock_flags) __releases(pag->pag_ici_lock)
{
+ struct inode *inode = VFS_I(ip);
struct xfs_mount *mp = ip->i_mount;
- int error = EAGAIN;
+ int error;
+
+ spin_lock(&ip->i_flags_lock);
/*
- * If INEW is set this inode is being set up
- * If IRECLAIM is set this inode is being torn down
- * Pause and try again.
+ * If we are racing with another cache hit that is currently
+ * instantiating this inode or currently recycling it out of
+ * reclaimabe state, wait for the initialisation to complete
+ * before continuing.
+ *
+ * XXX(hch): eventually we should do something equivalent to
+ * wait_on_inode to wait for these flags to be cleared
+ * instead of polling for it.
*/
- if (xfs_iflags_test(ip, (XFS_INEW|XFS_IRECLAIM))) {
+ if (ip->i_flags & (XFS_INEW|XFS_IRECLAIM)) {
XFS_STATS_INC(xs_ig_frecycle);
+ error = EAGAIN;
goto out_error;
}
- /* If IRECLAIMABLE is set, we've torn down the vfs inode part */
- if (xfs_iflags_test(ip, XFS_IRECLAIMABLE)) {
-
- /*
- * If lookup is racing with unlink, then we should return an
- * error immediately so we don't remove it from the reclaim
- * list and potentially leak the inode.
- */
- if ((ip->i_d.di_mode == 0) && !(flags & XFS_IGET_CREATE)) {
- error = ENOENT;
- goto out_error;
- }
+ /*
+ * If lookup is racing with unlink return an error immediately.
+ */
+ if (ip->i_d.di_mode == 0 && !(flags & XFS_IGET_CREATE)) {
+ error = ENOENT;
+ goto out_error;
+ }
+ /*
+ * If IRECLAIMABLE is set, we've torn down the VFS inode already.
+ * Need to carefully get it back into useable state.
+ */
+ if (ip->i_flags & XFS_IRECLAIMABLE) {
xfs_itrace_exit_tag(ip, "xfs_iget.alloc");
/*
- * We need to re-initialise the VFS inode as it has been
- * 'freed' by the VFS. Do this here so we can deal with
- * errors cleanly, then tag it so it can be set up correctly
- * later.
+ * We need to set XFS_INEW atomically with clearing the
+ * reclaimable tag so that we do have an indicator of the
+ * inode still being initialized.
*/
- if (inode_init_always(mp->m_super, VFS_I(ip))) {
- error = ENOMEM;
- goto out_error;
- }
+ ip->i_flags |= XFS_INEW;
+ ip->i_flags &= ~XFS_IRECLAIMABLE;
+ __xfs_inode_clear_reclaim_tag(mp, pag, ip);
- /*
- * We must set the XFS_INEW flag before clearing the
- * XFS_IRECLAIMABLE flag so that if a racing lookup does
- * not find the XFS_IRECLAIMABLE above but has the igrab()
- * below succeed we can safely check XFS_INEW to detect
- * that this inode is still being initialised.
- */
- xfs_iflags_set(ip, XFS_INEW);
- xfs_iflags_clear(ip, XFS_IRECLAIMABLE);
+ spin_unlock(&ip->i_flags_lock);
+ read_unlock(&pag->pag_ici_lock);
- /* clear the radix tree reclaim flag as well. */
- __xfs_inode_clear_reclaim_tag(mp, pag, ip);
- } else if (!igrab(VFS_I(ip))) {
+ error = -inode_init_always(mp->m_super, inode);
+ if (error) {
+ /*
+ * Re-initializing the inode failed, and we are in deep
+ * trouble. Try to re-add it to the reclaim list.
+ */
+ read_lock(&pag->pag_ici_lock);
+ spin_lock(&ip->i_flags_lock);
+
+ ip->i_flags &= ~XFS_INEW;
+ ip->i_flags |= XFS_IRECLAIMABLE;
+ __xfs_inode_set_reclaim_tag(pag, ip);
+ goto out_error;
+ }
+ inode->i_state = I_LOCK|I_NEW;
+ } else {
/* If the VFS inode is being torn down, pause and try again. */
- XFS_STATS_INC(xs_ig_frecycle);
- goto out_error;
- } else if (xfs_iflags_test(ip, XFS_INEW)) {
- /*
- * We are racing with another cache hit that is
- * currently recycling this inode out of the XFS_IRECLAIMABLE
- * state. Wait for the initialisation to complete before
- * continuing.
- */
- wait_on_inode(VFS_I(ip));
- }
+ if (!igrab(inode)) {
+ error = EAGAIN;
+ goto out_error;
+ }
- if (ip->i_d.di_mode == 0 && !(flags & XFS_IGET_CREATE)) {
- error = ENOENT;
- iput(VFS_I(ip));
- goto out_error;
+ /* We've got a live one. */
+ spin_unlock(&ip->i_flags_lock);
+ read_unlock(&pag->pag_ici_lock);
}
- /* We've got a live one. */
- read_unlock(&pag->pag_ici_lock);
-
if (lock_flags != 0)
xfs_ilock(ip, lock_flags);
@@ -274,6 +276,7 @@ xfs_iget_cache_hit(
return 0;
out_error:
+ spin_unlock(&ip->i_flags_lock);
read_unlock(&pag->pag_ici_lock);
return error;
}