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btrfs: fix return value check of btrfs_join_transaction()

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The error check of btrfs_join_transaction()/btrfs_join_transaction_nolock()
is added, and the mistake of the error check in several places is
corrected.

For more stable Btrfs, I think that we should reduce BUG_ON().
But, I think that long time is necessary for this.
So, I propose this patch as a short-term solution.

With this patch:
 - To more stable Btrfs, the part that should be corrected is clarified.
 - The panic isn't done by the NULL pointer reference etc. (even if
   BUG_ON() is increased temporarily)
 - The error code is returned in the place where the error can be easily
   returned.

As a long-term plan:
 - BUG_ON() is reduced by using the forced-readonly framework, etc.

Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Tsutomu Itoh
2011-01-25 02:51:38 +00:00
committed by Chris Mason
parent 34d19bada0
commit 3612b49598
6 changed files with 51 additions and 13 deletions
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24
fs/btrfs/inode.c
View File

@@ -416,7 +416,7 @@ again:
}
if (start == 0) {
trans = btrfs_join_transaction(root, 1);
BUG_ON(!trans);
BUG_ON(IS_ERR(trans));
btrfs_set_trans_block_group(trans, inode);
trans->block_rsv = &root->fs_info->delalloc_block_rsv;
@@ -612,6 +612,7 @@ retry:
GFP_NOFS);
trans = btrfs_join_transaction(root, 1);
BUG_ON(IS_ERR(trans));
ret = btrfs_reserve_extent(trans, root,
async_extent->compressed_size,
async_extent->compressed_size,
@@ -771,7 +772,7 @@ static noinline int cow_file_range(struct inode *inode,
BUG_ON(root == root->fs_info->tree_root);
trans = btrfs_join_transaction(root, 1);
BUG_ON(!trans);
BUG_ON(IS_ERR(trans));
btrfs_set_trans_block_group(trans, inode);
trans->block_rsv = &root->fs_info->delalloc_block_rsv;
@@ -1049,7 +1050,7 @@ static noinline int run_delalloc_nocow(struct inode *inode,
} else {
trans = btrfs_join_transaction(root, 1);
}
BUG_ON(!trans);
BUG_ON(IS_ERR(trans));
cow_start = (u64)-1;
cur_offset = start;
@@ -1704,7 +1705,7 @@ static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end)
trans = btrfs_join_transaction_nolock(root, 1);
else
trans = btrfs_join_transaction(root, 1);
BUG_ON(!trans);
BUG_ON(IS_ERR(trans));
btrfs_set_trans_block_group(trans, inode);
trans->block_rsv = &root->fs_info->delalloc_block_rsv;
ret = btrfs_update_inode(trans, root, inode);
@@ -1721,6 +1722,7 @@ static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end)
trans = btrfs_join_transaction_nolock(root, 1);
else
trans = btrfs_join_transaction(root, 1);
BUG_ON(IS_ERR(trans));
btrfs_set_trans_block_group(trans, inode);
trans->block_rsv = &root->fs_info->delalloc_block_rsv;
@@ -2382,6 +2384,7 @@ void btrfs_orphan_cleanup(struct btrfs_root *root)
if (root->orphan_block_rsv || root->orphan_item_inserted) {
trans = btrfs_join_transaction(root, 1);
BUG_ON(IS_ERR(trans));
btrfs_end_transaction(trans, root);
}
@@ -4350,6 +4353,8 @@ int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc)
trans = btrfs_join_transaction_nolock(root, 1);
else
trans = btrfs_join_transaction(root, 1);
if (IS_ERR(trans))
return PTR_ERR(trans);
btrfs_set_trans_block_group(trans, inode);
if (nolock)
ret = btrfs_end_transaction_nolock(trans, root);
@@ -4375,6 +4380,7 @@ void btrfs_dirty_inode(struct inode *inode)
return;
trans = btrfs_join_transaction(root, 1);
BUG_ON(IS_ERR(trans));
btrfs_set_trans_block_group(trans, inode);
ret = btrfs_update_inode(trans, root, inode);
@@ -5179,6 +5185,8 @@ again:
em = NULL;
btrfs_release_path(root, path);
trans = btrfs_join_transaction(root, 1);
if (IS_ERR(trans))
return ERR_CAST(trans);
goto again;
}
map = kmap(page);
@@ -5283,8 +5291,8 @@ static struct extent_map *btrfs_new_extent_direct(struct inode *inode,
btrfs_drop_extent_cache(inode, start, start + len - 1, 0);
trans = btrfs_join_transaction(root, 0);
if (!trans)
return ERR_PTR(-ENOMEM);
if (IS_ERR(trans))
return ERR_CAST(trans);
trans->block_rsv = &root->fs_info->delalloc_block_rsv;
@@ -5508,7 +5516,7 @@ static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock,
* while we look for nocow cross refs
*/
trans = btrfs_join_transaction(root, 0);
if (!trans)
if (IS_ERR(trans))
goto must_cow;
if (can_nocow_odirect(trans, inode, start, len) == 1) {
@@ -5643,7 +5651,7 @@ again:
BUG_ON(!ordered);
trans = btrfs_join_transaction(root, 1);
if (!trans) {
if (IS_ERR(trans)) {
err = -ENOMEM;
goto out;
}