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[GFS2] filesystem consistency error from do_strip

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This patch fixes a GFS2 filesystem consistency error reported from
function do_strip.  The problem was caused by a timing window
that allowed two vfs inodes to be created in memory that point
to the same file.  The problem is fixed by making the vfs's
iget_test, iget_set mechanism check and set a new bit in the
in-core gfs2_inode structure while the vfs inode spin_lock is held.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Bob Peterson
2008-04-29 12:35:48 -05:00
committed by Steven Whitehouse
parent 492c2e476e
commit 091806edd4
5 changed files with 20 additions and 15 deletions
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10
fs/gfs2/inode.c
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@@ -47,8 +47,7 @@ static int iget_test(struct inode *inode, void *opaque)
struct gfs2_inode *ip = GFS2_I(inode);
u64 *no_addr = opaque;
if (ip->i_no_addr == *no_addr &&
inode->i_private != NULL)
if (ip->i_no_addr == *no_addr && test_bit(GIF_USER, &ip->i_flags))
return 1;
return 0;
@@ -61,6 +60,7 @@ static int iget_set(struct inode *inode, void *opaque)
inode->i_ino = (unsigned long)*no_addr;
ip->i_no_addr = *no_addr;
set_bit(GIF_USER, &ip->i_flags);
return 0;
}
@@ -86,7 +86,7 @@ static int iget_skip_test(struct inode *inode, void *opaque)
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_skip_data *data = opaque;
if (ip->i_no_addr == data->no_addr && inode->i_private != NULL){
if (ip->i_no_addr == data->no_addr && test_bit(GIF_USER, &ip->i_flags)){
if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)){
data->skipped = 1;
return 0;
@@ -105,6 +105,7 @@ static int iget_skip_set(struct inode *inode, void *opaque)
return 1;
inode->i_ino = (unsigned long)(data->no_addr);
ip->i_no_addr = data->no_addr;
set_bit(GIF_USER, &ip->i_flags);
return 0;
}
@@ -166,7 +167,7 @@ void gfs2_set_iop(struct inode *inode)
* Returns: A VFS inode, or an error
*/
struct inode *gfs2_inode_lookup(struct super_block *sb,
struct inode *gfs2_inode_lookup(struct super_block *sb,
unsigned int type,
u64 no_addr,
u64 no_formal_ino, int skip_freeing)
@@ -187,7 +188,6 @@ struct inode *gfs2_inode_lookup(struct super_block *sb,
if (inode->i_state & I_NEW) {
struct gfs2_sbd *sdp = GFS2_SB(inode);
inode->i_private = ip;
ip->i_no_formal_ino = no_formal_ino;
error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);