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authorSage Weil <sage@newdream.net>2011-11-30 21:47:09 +0400
committerSage Weil <sage@newdream.net>2011-12-07 22:46:44 +0400
commitbe655596b3de5873f994ddbe205751a5ffb4de39 (patch)
treecf6e53c6344f87a47ac68d6a6ff4d7dac6e5c25e /fs/ceph/snap.c
parent51703306b3b9ea7c05728040998521e47358147b (diff)
downloadlinux-be655596b3de5873f994ddbe205751a5ffb4de39.tar.xz
ceph: use i_ceph_lock instead of i_lock
We have been using i_lock to protect all kinds of data structures in the ceph_inode_info struct, including lists of inodes that we need to iterate over while avoiding races with inode destruction. That requires grabbing a reference to the inode with the list lock protected, but igrab() now takes i_lock to check the inode flags. Changing the list lock ordering would be a painful process. However, using a ceph-specific i_ceph_lock in the ceph inode instead of i_lock is a simple mechanical change and avoids the ordering constraints imposed by igrab(). Reported-by: Amon Ott <a.ott@m-privacy.de> Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'fs/ceph/snap.c')
-rw-r--r--fs/ceph/snap.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c
index e26437191333..a559c80f127a 100644
--- a/fs/ceph/snap.c
+++ b/fs/ceph/snap.c
@@ -446,7 +446,7 @@ void ceph_queue_cap_snap(struct ceph_inode_info *ci)
return;
}
- spin_lock(&inode->i_lock);
+ spin_lock(&ci->i_ceph_lock);
used = __ceph_caps_used(ci);
dirty = __ceph_caps_dirty(ci);
@@ -528,7 +528,7 @@ void ceph_queue_cap_snap(struct ceph_inode_info *ci)
kfree(capsnap);
}
- spin_unlock(&inode->i_lock);
+ spin_unlock(&ci->i_ceph_lock);
}
/*
@@ -537,7 +537,7 @@ void ceph_queue_cap_snap(struct ceph_inode_info *ci)
*
* If capsnap can now be flushed, add to snap_flush list, and return 1.
*
- * Caller must hold i_lock.
+ * Caller must hold i_ceph_lock.
*/
int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
struct ceph_cap_snap *capsnap)
@@ -739,9 +739,9 @@ static void flush_snaps(struct ceph_mds_client *mdsc)
inode = &ci->vfs_inode;
ihold(inode);
spin_unlock(&mdsc->snap_flush_lock);
- spin_lock(&inode->i_lock);
+ spin_lock(&ci->i_ceph_lock);
__ceph_flush_snaps(ci, &session, 0);
- spin_unlock(&inode->i_lock);
+ spin_unlock(&ci->i_ceph_lock);
iput(inode);
spin_lock(&mdsc->snap_flush_lock);
}
@@ -847,7 +847,7 @@ void ceph_handle_snap(struct ceph_mds_client *mdsc,
continue;
ci = ceph_inode(inode);
- spin_lock(&inode->i_lock);
+ spin_lock(&ci->i_ceph_lock);
if (!ci->i_snap_realm)
goto skip_inode;
/*
@@ -876,7 +876,7 @@ void ceph_handle_snap(struct ceph_mds_client *mdsc,
oldrealm = ci->i_snap_realm;
ci->i_snap_realm = realm;
spin_unlock(&realm->inodes_with_caps_lock);
- spin_unlock(&inode->i_lock);
+ spin_unlock(&ci->i_ceph_lock);
ceph_get_snap_realm(mdsc, realm);
ceph_put_snap_realm(mdsc, oldrealm);
@@ -885,7 +885,7 @@ void ceph_handle_snap(struct ceph_mds_client *mdsc,
continue;
skip_inode:
- spin_unlock(&inode->i_lock);
+ spin_unlock(&ci->i_ceph_lock);
iput(inode);
}