[PATCH] ext3 filesystem bogus ENOSPC with reservation fix

To handle the earlier bogus ENOSPC error caused by filesystem full of block
reservation, current code falls back to non block reservation, starts to
allocate block(s) from the goal allocation block group as if there is no
block reservation.

Current code needs to re-load the corresponding block group descriptor for
the initial goal block group in this case.  The patch fixes this.

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/fs/ext3/balloc.c b/fs/ext3/balloc.c
index a504a40..063d994 100644 (file)
--- a/fs/ext3/balloc.c
+++ b/fs/ext3/balloc.c
@@ -1269,12 +1269,12 @@ ext3_fsblk_t ext3_new_blocks(handle_t *handle, struct inode *inode,
                goal = le32_to_cpu(es->s_first_data_block);
        group_no = (goal - le32_to_cpu(es->s_first_data_block)) /
                        EXT3_BLOCKS_PER_GROUP(sb);
+       goal_group = group_no;
+retry_alloc:
        gdp = ext3_get_group_desc(sb, group_no, &gdp_bh);
        if (!gdp)
                goto io_error;
 
-       goal_group = group_no;
-retry:
        free_blocks = le16_to_cpu(gdp->bg_free_blocks_count);
        /*
         * if there is not enough free blocks to make a new resevation
@@ -1349,7 +1349,7 @@ retry:
        if (my_rsv) {
                my_rsv = NULL;
                group_no = goal_group;
-               goto retry;
+               goto retry_alloc;
        }
        /* No space left on the device */
        *errp = -ENOSPC;