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xfs: handle ENOMEM correctly during initialisation of perag structures 

Add proper error handling in case an error occurs while initializing
new perag structures for a mount point.  The mount structure is
restored to its previous state by deleting and freeing any perag
structures added during the call.

Signed-off-by: Dave Chinner <david@fromorbit.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Dave Chinner 2010-01-11 11:47:48 +00:00 committed by Alex Elder
parent b657fc82a3
commit 8b26c5825e
1 changed files with 17 additions and 4 deletions
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21
fs/xfs/xfs_mount.c
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@ -432,11 +432,13 @@ xfs_initialize_perag(
xfs_agnumber_t *maxagi)
{
xfs_agnumber_t index, max_metadata;
xfs_agnumber_t first_initialised = 0;
xfs_perag_t *pag;
xfs_agino_t agino;
xfs_ino_t ino;
xfs_sb_t *sbp = &mp->m_sb;
xfs_ino_t max_inum = XFS_MAXINUMBER_32;
int error = -ENOMEM;
/* Check to see if the filesystem can overflow 32 bit inodes */
agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
@ -453,17 +455,20 @@ xfs_initialize_perag(
xfs_perag_put(pag);
continue;
}
if (!first_initialised)
first_initialised = index;
pag = kmem_zalloc(sizeof(*pag), KM_MAYFAIL);
if (!pag)
return -ENOMEM;
goto out_unwind;
if (radix_tree_preload(GFP_NOFS))
return -ENOMEM;
goto out_unwind;
spin_lock(&mp->m_perag_lock);
if (radix_tree_insert(&mp->m_perag_tree, index, pag)) {
BUG();
spin_unlock(&mp->m_perag_lock);
kmem_free(pag);
return -EEXIST;
radix_tree_preload_end();
error = -EEXIST;
goto out_unwind;
}
pag->pag_agno = index;
pag->pag_mount = mp;
@ -523,6 +528,14 @@ xfs_initialize_perag(
if (maxagi)
*maxagi = index;
return 0;
out_unwind:
kmem_free(pag);
for (; index > first_initialised; index--) {
pag = radix_tree_delete(&mp->m_perag_tree, index);
kmem_free(pag);
}
return error;
}
void