ocfs2: rollback alloc_dinode counts when ocfs2_block_group_set_bits() failed
After updating alloc_dinode counts in ocfs2_alloc_dinode_update_counts(),
if ocfs2_alloc_dinode_update_bitmap() failed, there is a rare case that
some space may be lost.
So, roll back alloc_dinode counts when ocfs2_block_group_set_bits()
failed.
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Younger Liu <younger.liucn@gmail.com>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c
index 482d6c2..94fb1f3 100644
--- a/fs/ocfs2/suballoc.c
+++ b/fs/ocfs2/suballoc.c
@@ -1608,6 +1608,21 @@
return ret;
}
+void ocfs2_rollback_alloc_dinode_counts(struct inode *inode,
+ struct buffer_head *di_bh,
+ u32 num_bits,
+ u16 chain)
+{
+ u32 tmp_used;
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
+ struct ocfs2_chain_list *cl;
+
+ cl = (struct ocfs2_chain_list *)&di->id2.i_chain;
+ tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);
+ di->id1.bitmap1.i_used = cpu_to_le32(tmp_used - num_bits);
+ le32_add_cpu(&cl->cl_recs[chain].c_free, num_bits);
+}
+
static int ocfs2_bg_discontig_fix_by_rec(struct ocfs2_suballoc_result *res,
struct ocfs2_extent_rec *rec,
struct ocfs2_chain_list *cl)
@@ -1708,8 +1723,12 @@
ret = ocfs2_block_group_set_bits(handle, alloc_inode, gd, group_bh,
res->sr_bit_offset, res->sr_bits);
- if (ret < 0)
+ if (ret < 0) {
+ ocfs2_rollback_alloc_dinode_counts(alloc_inode, ac->ac_bh,
+ res->sr_bits,
+ le16_to_cpu(gd->bg_chain));
mlog_errno(ret);
+ }
out_loc_only:
*bits_left = le16_to_cpu(gd->bg_free_bits_count);
@@ -1839,6 +1858,8 @@
res->sr_bit_offset,
res->sr_bits);
if (status < 0) {
+ ocfs2_rollback_alloc_dinode_counts(alloc_inode,
+ ac->ac_bh, res->sr_bits, chain);
mlog_errno(status);
goto bail;
}
@@ -2150,6 +2171,8 @@
res->sr_bit_offset,
res->sr_bits);
if (ret < 0) {
+ ocfs2_rollback_alloc_dinode_counts(ac->ac_inode,
+ ac->ac_bh, res->sr_bits, chain);
mlog_errno(ret);
goto out;
}
