ocfs2: Make ocfs2_extend_trans() really extend.
In ocfs2, we use ocfs2_extend_trans() to extend a journal handle's
blocks. But if jbd2_journal_extend() fails, it will only restart
with the the new number of blocks. This tends to be awkward since
in most cases we want additional reserved blocks. It makes our code
harder to mantain since the caller can't be sure all the original
blocks will not be accessed and dirtied again. There are 15 callers
of ocfs2_extend_trans() in fs/ocfs2, and 12 of them have to add
h_buffer_credits before they call ocfs2_extend_trans(). This makes
ocfs2_extend_trans() really extend atop the original block count.
Signed-off-by: Tao Ma <tao.ma@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index a74ea70..0cb2945 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -1125,8 +1125,7 @@
goto out;
}
- status = ocfs2_extend_trans(handle, path_num_items(path) +
- handle->h_buffer_credits);
+ status = ocfs2_extend_trans(handle, path_num_items(path));
if (status < 0) {
mlog_errno(status);
goto out;
@@ -2288,20 +2287,14 @@
int op_credits,
struct ocfs2_path *path)
{
- int ret;
+ int ret = 0;
int credits = (path->p_tree_depth - subtree_depth) * 2 + 1 + op_credits;
- if (handle->h_buffer_credits < credits) {
+ if (handle->h_buffer_credits < credits)
ret = ocfs2_extend_trans(handle,
credits - handle->h_buffer_credits);
- if (ret)
- return ret;
- if (unlikely(handle->h_buffer_credits < credits))
- return ocfs2_extend_trans(handle, credits);
- }
-
- return 0;
+ return ret;
}
/*
@@ -2545,8 +2538,7 @@
* records for all the bh in the path.
* So we have to allocate extra credits and access them.
*/
- ret = ocfs2_extend_trans(handle,
- handle->h_buffer_credits + subtree_index);
+ ret = ocfs2_extend_trans(handle, subtree_index);
if (ret) {
mlog_errno(ret);
goto out;
@@ -4141,17 +4133,13 @@
struct buffer_head *leaf_bh = path_leaf_bh(right_path);
if (left_path) {
- int credits = handle->h_buffer_credits;
-
/*
* There's a chance that left_path got passed back to
* us without being accounted for in the
* journal. Extend our transaction here to be sure we
* can change those blocks.
*/
- credits += left_path->p_tree_depth;
-
- ret = ocfs2_extend_trans(handle, credits);
+ ret = ocfs2_extend_trans(handle, left_path->p_tree_depth);
if (ret < 0) {
mlog_errno(ret);
goto out;
@@ -5237,7 +5225,7 @@
int index, u32 new_range,
struct ocfs2_alloc_context *meta_ac)
{
- int ret, depth, credits = handle->h_buffer_credits;
+ int ret, depth, credits;
struct buffer_head *last_eb_bh = NULL;
struct ocfs2_extent_block *eb;
struct ocfs2_extent_list *rightmost_el, *el;
@@ -5268,8 +5256,8 @@
} else
rightmost_el = path_leaf_el(path);
- credits += path->p_tree_depth +
- ocfs2_extend_meta_needed(et->et_root_el);
+ credits = path->p_tree_depth +
+ ocfs2_extend_meta_needed(et->et_root_el);
ret = ocfs2_extend_trans(handle, credits);
if (ret) {
mlog_errno(ret);
diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index cfd271c..47878cf 100644
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -402,9 +402,7 @@
}
/*
- * 'nblocks' is what you want to add to the current
- * transaction. extend_trans will either extend the current handle by
- * nblocks, or commit it and start a new one with nblocks credits.
+ * 'nblocks' is what you want to add to the current transaction.
*
* This might call jbd2_journal_restart() which will commit dirty buffers
* and then restart the transaction. Before calling
@@ -422,11 +420,15 @@
*/
int ocfs2_extend_trans(handle_t *handle, int nblocks)
{
- int status;
+ int status, old_nblocks;
BUG_ON(!handle);
- BUG_ON(!nblocks);
+ BUG_ON(nblocks < 0);
+ if (!nblocks)
+ return 0;
+
+ old_nblocks = handle->h_buffer_credits;
mlog_entry_void();
mlog(0, "Trying to extend transaction by %d blocks\n", nblocks);
@@ -445,7 +447,8 @@
mlog(0,
"jbd2_journal_extend failed, trying "
"jbd2_journal_restart\n");
- status = jbd2_journal_restart(handle, nblocks);
+ status = jbd2_journal_restart(handle,
+ old_nblocks + nblocks);
if (status < 0) {
mlog_errno(status);
goto bail;
diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c
index 4b0b4eb..33dd2a1 100644
--- a/fs/ocfs2/refcounttree.c
+++ b/fs/ocfs2/refcounttree.c
@@ -1693,7 +1693,7 @@
* 2 more credits, one for the leaf refcount block, one for
* the extent block contains the extent rec.
*/
- ret = ocfs2_extend_trans(handle, handle->h_buffer_credits + 2);
+ ret = ocfs2_extend_trans(handle, 2);
if (ret < 0) {
mlog_errno(ret);
goto out;
diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
index 4cf6fde..38a55ff 100644
--- a/fs/ocfs2/xattr.c
+++ b/fs/ocfs2/xattr.c
@@ -3295,8 +3295,7 @@
goto out;
}
- ret = ocfs2_extend_trans(ctxt->handle, credits +
- ctxt->handle->h_buffer_credits);
+ ret = ocfs2_extend_trans(ctxt->handle, credits);
if (ret) {
mlog_errno(ret);
goto out;
@@ -3326,8 +3325,7 @@
goto out;
}
- ret = ocfs2_extend_trans(ctxt->handle, credits +
- ctxt->handle->h_buffer_credits);
+ ret = ocfs2_extend_trans(ctxt->handle, credits);
if (ret) {
mlog_errno(ret);
goto out;
@@ -3361,8 +3359,7 @@
goto out;
}
- ret = ocfs2_extend_trans(ctxt->handle, credits +
- ctxt->handle->h_buffer_credits);
+ ret = ocfs2_extend_trans(ctxt->handle, credits);
if (ret) {
mlog_errno(ret);
goto out;
@@ -4870,8 +4867,7 @@
* We need to update the first bucket of the old extent and all
* the buckets going to the new extent.
*/
- credits = ((num_buckets + 1) * blks_per_bucket) +
- handle->h_buffer_credits;
+ credits = ((num_buckets + 1) * blks_per_bucket);
ret = ocfs2_extend_trans(handle, credits);
if (ret) {
mlog_errno(ret);
@@ -4941,7 +4937,7 @@
u32 *first_hash)
{
u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
- int ret, credits = 2 * blk_per_bucket + handle->h_buffer_credits;
+ int ret, credits = 2 * blk_per_bucket;
BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
@@ -5181,8 +5177,7 @@
* existing bucket. Then we add the last existing bucket, the
* new bucket, and the first bucket (3 * blk_per_bucket).
*/
- credits = (end_blk - target_blk) + (3 * blk_per_bucket) +
- handle->h_buffer_credits;
+ credits = (end_blk - target_blk) + (3 * blk_per_bucket);
ret = ocfs2_extend_trans(handle, credits);
if (ret) {
mlog_errno(ret);