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Btrfs: fix number of transaction units for renames with whiteout

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When we do a rename with the whiteout flag, we need to create the whiteout
inode, which in the worst case requires 5 transaction units (1 inode item,
1 inode ref, 2 dir items and 1 xattr if selinux is enabled). So bump the
number of transaction units from 11 to 16 if the whiteout flag is set.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
This commit is contained in:
Filipe Manana 2016-05-05 10:26:26 +01:00
parent 376e5a57bf
commit 5062af35c3
1 changed files with 8 additions and 1 deletions
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9
fs/btrfs/inode.c
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@ -9668,6 +9668,7 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
unsigned int flags)
{
struct btrfs_trans_handle *trans;
unsigned int trans_num_items;
struct btrfs_root *root = BTRFS_I(old_dir)->root;
struct btrfs_root *dest = BTRFS_I(new_dir)->root;
struct inode *new_inode = d_inode(new_dentry);
@ -9730,8 +9731,14 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
* would require 5 item modifications, so we'll assume they are normal
* inodes. So 5 * 2 is 10, plus 1 for the new link, so 11 total items
* should cover the worst case number of items we'll modify.
* If our rename has the whiteout flag, we need more 5 units for the
* new inode (1 inode item, 1 inode ref, 2 dir items and 1 xattr item
* when selinux is enabled).
*/
trans = btrfs_start_transaction(root, 11);
trans_num_items = 11;
if (flags & RENAME_WHITEOUT)
trans_num_items += 5;
trans = btrfs_start_transaction(root, trans_num_items);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
goto out_notrans;