ocfs2: Fix ocfs2_read_quota_block() error handling.
ocfs2_bread() has become ocfs2_read_virt_blocks(), with a prototype to
match ocfs2_read_blocks(). The quota code, converting from
ocfs2_bread(), wraps the call to ocfs2_read_virt_blocks() in
ocfs2_read_quota_block(). Unfortunately, the prototype of
ocfs2_read_quota_block() matches the old prototype of ocfs2_bread().
The problem is that ocfs2_bread() returned the buffer head, and callers
assumed that a NULL pointer was indicative of error. It wasn't. This
is why ocfs2_bread() took an int*err argument as well.
The new prototype of ocfs2_read_virt_blocks() avoids this error handling
confusion. Let's change ocfs2_read_quota_block() to match.
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Acked-by: Jan Kara <jack@suse.cz>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
diff --git a/fs/ocfs2/quota_global.c b/fs/ocfs2/quota_global.c
index 10ecb33..2bdcddd 100644
--- a/fs/ocfs2/quota_global.c
+++ b/fs/ocfs2/quota_global.c
@@ -87,16 +87,21 @@
.is_id = ocfs2_global_is_id,
};
-struct buffer_head *ocfs2_read_quota_block(struct inode *inode,
- int block, int *err)
+int ocfs2_read_quota_block(struct inode *inode, u64 v_block,
+ struct buffer_head **bh)
{
- struct buffer_head *tmp = NULL;
+ int rc = 0;
+ struct buffer_head *tmp = *bh;
- *err = ocfs2_read_virt_blocks(inode, block, 1, &tmp, 0, NULL);
- if (*err)
- mlog_errno(*err);
+ rc = ocfs2_read_virt_blocks(inode, v_block, 1, &tmp, 0, NULL);
+ if (rc)
+ mlog_errno(rc);
- return tmp;
+ /* If ocfs2_read_virt_blocks() got us a new bh, pass it up. */
+ if (!rc && !*bh)
+ *bh = tmp;
+
+ return rc;
}
static struct buffer_head *ocfs2_get_quota_block(struct inode *inode,
@@ -143,8 +148,9 @@
toread = len;
while (toread > 0) {
tocopy = min((size_t)(sb->s_blocksize - offset), toread);
- bh = ocfs2_read_quota_block(gqinode, blk, &err);
- if (!bh) {
+ bh = NULL;
+ err = ocfs2_read_quota_block(gqinode, blk, &bh);
+ if (err) {
mlog_errno(err);
return err;
}
@@ -169,7 +175,7 @@
int offset = off & (sb->s_blocksize - 1);
sector_t blk = off >> sb->s_blocksize_bits;
int err = 0, new = 0;
- struct buffer_head *bh;
+ struct buffer_head *bh = NULL;
handle_t *handle = journal_current_handle();
if (!handle) {
@@ -200,13 +206,13 @@
/* Not rewriting whole block? */
if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
!new) {
- bh = ocfs2_read_quota_block(gqinode, blk, &err);
- if (!bh) {
+ err = ocfs2_read_quota_block(gqinode, blk, &bh);
+ if (err) {
mlog_errno(err);
return err;
}
err = ocfs2_journal_access(handle, gqinode, bh,
- OCFS2_JOURNAL_ACCESS_WRITE);
+ OCFS2_JOURNAL_ACCESS_WRITE);
} else {
bh = ocfs2_get_quota_block(gqinode, blk, &err);
if (!bh) {
@@ -214,7 +220,7 @@
return err;
}
err = ocfs2_journal_access(handle, gqinode, bh,
- OCFS2_JOURNAL_ACCESS_CREATE);
+ OCFS2_JOURNAL_ACCESS_CREATE);
}
if (err < 0) {
brelse(bh);