xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Btrfs: extent_map and data=ordered fixes for space balancing

Browse Source 
* Add an EXTENT_BOUNDARY state bit to keep the writepage code
from merging data extents that are in the process of being
relocated.  This allows us to do accounting for them properly.

* The balancing code relocates data extents indepdent of the underlying
inode.  The extent_map code was modified to properly account for
things moving around (invalidating extent_map caches in the inode).

* Don't take the drop_mutex in the create_subvol ioctl.  It isn't
required.

* Fix walking of the ordered extent list to avoid races with sys_unlink

* Change the lock ordering rules.  Transaction start goes outside
the drop_mutex.  This allows btrfs_commit_transaction to directly
drop the relocation trees.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Zheng Yan
2008-09-26 10:05:38 -04:00
committed by Chris Mason
parent e465768938
commit 5b21f2ed3f
10 changed files with 108 additions and 49 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
fs/btrfs/ctree.c
View File

@@ -290,7 +290,6 @@ int noinline btrfs_cow_block(struct btrfs_trans_handle *trans,
struct extent_buffer **cow_ret, u64 prealloc_dest)
{
u64 search_start;
u64 header_trans;
int ret;
if (trans->transaction != root->fs_info->running_transaction) {
@@ -304,9 +303,9 @@ int noinline btrfs_cow_block(struct btrfs_trans_handle *trans,
WARN_ON(1);
}
header_trans = btrfs_header_generation(buf);
spin_lock(&root->fs_info->hash_lock);
if (header_trans == trans->transid &&
if (btrfs_header_generation(buf) == trans->transid &&
btrfs_header_owner(buf) == root->root_key.objectid &&
!btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) {
*cow_ret = buf;
spin_unlock(&root->fs_info->hash_lock);
@@ -1300,6 +1299,7 @@ again:
/* is a cow on this block not required */
spin_lock(&root->fs_info->hash_lock);
if (btrfs_header_generation(b) == trans->transid &&
btrfs_header_owner(b) == root->root_key.objectid &&
!btrfs_header_flag(b, BTRFS_HEADER_FLAG_WRITTEN)) {
spin_unlock(&root->fs_info->hash_lock);
goto cow_done;
@@ -1396,7 +1396,8 @@ cow_done:
/* this is only true while dropping a snapshot */
if (level == lowest_level) {
break;
ret = 0;
goto done;
}
blocknr = btrfs_node_blockptr(b, slot);