lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[GFS2] Fix change nlink deadlock

Browse Source 
Bugzilla 215088

Fix deadlock in gfs2_change_nlink() while installing RHEL5 into GFS2
partition. The gfs2_rename() apparently needs block allocation for the
new name (into the directory) where it requires rg locks. At the same
time, while updating the nlink count for the replaced file,
gfs2_change_nlink() tries to return the inode meta-data back to resource
group where it needs rg locks too. Our logic doesn't allow process to
acquire these locks recursively by the same process  (RHEL installer)
that results a BUG call. This only happens within rename code path and
only if the destination file exists before the rename operation.

Signed-off-by: S. Wendy Cheng <wcheng@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
S. Wendy Cheng
2007-01-18 15:56:34 -05:00
committed by Steven Whitehouse
parent e1d5b18ae9
commit 5509826f1e
3 changed files with 39 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
fs/gfs2/inode.c
View File

@@ -281,16 +281,14 @@ out:
}
/**
* gfs2_change_nlink - Change nlink count on inode
* gfs2_change_nlink_i - Change nlink count on inode
* @ip: The GFS2 inode
* @diff: The change in the nlink count required
*
* Returns: errno
*/
int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
int gfs2_change_nlink_i(struct gfs2_inode *ip, int diff)
{
struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info;
struct buffer_head *dibh;
u32 nlink;
int error;
@@ -322,6 +320,20 @@ int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
brelse(dibh);
mark_inode_dirty(&ip->i_inode);
return error;
}
int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
{
struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info;
int error;
/* update the nlink */
error = gfs2_change_nlink_i(ip, diff);
if (error)
return error;
/* return meta data block back to rg */
if (ip->i_inode.i_nlink == 0) {
struct gfs2_rgrpd *rgd;
struct gfs2_holder ri_gh, rg_gh;