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ocfs2: free allocated clusters if error occurs after ocfs2_claim_clusters

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Even if using the same jbd2 handle, we cannot rollback a transaction.
So once some error occurs after successfully allocating clusters, the
allocated clusters will never be used and it means they are lost.  For
example, call ocfs2_claim_clusters successfully when expanding a file,
but failed in ocfs2_insert_extent.  So we need free the allocated
clusters if they are not used indeed.

Signed-off-by: Zongxun Wang <wangzongxun@huawei.com>
Signed-off-by: Joseph Qi <joseph.qi@huawei.com>
Acked-by: Joel Becker <jlbec@evilplan.org>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Li Zefan <lizefan@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Zongxun Wang 2014-02-06 12:04:20 -08:00 • committed by Linus Torvalds
parent 277cba1d28
commit fb951eb5e1
3 changed files with 83 additions and 3 deletions
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42
fs/ocfs2/localalloc.c
View file

@ -781,6 +781,48 @@ bail:
return status;
}
int ocfs2_free_local_alloc_bits(struct ocfs2_super *osb,
handle_t *handle,
struct ocfs2_alloc_context *ac,
u32 bit_off,
u32 num_bits)
{
int status, start;
u32 clear_bits;
struct inode *local_alloc_inode;
void *bitmap;
struct ocfs2_dinode *alloc;
struct ocfs2_local_alloc *la;
BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL);
local_alloc_inode = ac->ac_inode;
alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
la = OCFS2_LOCAL_ALLOC(alloc);
bitmap = la->la_bitmap;
start = bit_off - le32_to_cpu(la->la_bm_off);
clear_bits = num_bits;
status = ocfs2_journal_access_di(handle,
INODE_CACHE(local_alloc_inode),
osb->local_alloc_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
mlog_errno(status);
goto bail;
}
while (clear_bits--)
ocfs2_clear_bit(start++, bitmap);
le32_add_cpu(&alloc->id1.bitmap1.i_used, -num_bits);
ocfs2_journal_dirty(handle, osb->local_alloc_bh);
bail:
return status;
}
static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc)
{
u32 count;