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authorLiu Bo <bo.li.liu@oracle.com>2013-10-29 10:45:05 +0800
committerChris Mason <chris.mason@fusionio.com>2013-11-11 22:11:00 -0500
commit6f519564d7d978c00351d9ab6abac3deeac31621 (patch)
treead6219309aee3a44248fb7f7eb9756fc76423d79
parent269d040ff2f340e1ed517dab8b66b2f133c83a77 (diff)
downloadop-kernel-dev-6f519564d7d978c00351d9ab6abac3deeac31621.zip
op-kernel-dev-6f519564d7d978c00351d9ab6abac3deeac31621.tar.gz
Btrfs: do not run snapshot-aware defragment on error
If something wrong happens in write endio, running snapshot-aware defragment can end up with undefined results, maybe a crash, so we should avoid it. In order to share similar code, this also adds a helper to free the struct for snapshot-aware defrag. Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
-rw-r--r--fs/btrfs/inode.c47
1 files changed, 28 insertions, 19 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index c84adde..1780022 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2365,10 +2365,23 @@ out_unlock:
return ret;
}
+static void free_sa_defrag_extent(struct new_sa_defrag_extent *new)
+{
+ struct old_sa_defrag_extent *old, *tmp;
+
+ if (!new)
+ return;
+
+ list_for_each_entry_safe(old, tmp, &new->head, list) {
+ list_del(&old->list);
+ kfree(old);
+ }
+ kfree(new);
+}
+
static void relink_file_extents(struct new_sa_defrag_extent *new)
{
struct btrfs_path *path;
- struct old_sa_defrag_extent *old, *tmp;
struct sa_defrag_extent_backref *backref;
struct sa_defrag_extent_backref *prev = NULL;
struct inode *inode;
@@ -2411,16 +2424,11 @@ static void relink_file_extents(struct new_sa_defrag_extent *new)
kfree(prev);
btrfs_free_path(path);
-
- list_for_each_entry_safe(old, tmp, &new->head, list) {
- list_del(&old->list);
- kfree(old);
- }
out:
+ free_sa_defrag_extent(new);
+
atomic_dec(&root->fs_info->defrag_running);
wake_up(&root->fs_info->transaction_wait);
-
- kfree(new);
}
static struct new_sa_defrag_extent *
@@ -2430,7 +2438,7 @@ record_old_file_extents(struct inode *inode,
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_path *path;
struct btrfs_key key;
- struct old_sa_defrag_extent *old, *tmp;
+ struct old_sa_defrag_extent *old;
struct new_sa_defrag_extent *new;
int ret;
@@ -2478,7 +2486,7 @@ record_old_file_extents(struct inode *inode,
if (slot >= btrfs_header_nritems(l)) {
ret = btrfs_next_leaf(root, path);
if (ret < 0)
- goto out_free_list;
+ goto out_free_path;
else if (ret > 0)
break;
continue;
@@ -2507,7 +2515,7 @@ record_old_file_extents(struct inode *inode,
old = kmalloc(sizeof(*old), GFP_NOFS);
if (!old)
- goto out_free_list;
+ goto out_free_path;
offset = max(new->file_pos, key.offset);
end = min(new->file_pos + new->len, key.offset + num_bytes);
@@ -2529,15 +2537,10 @@ next:
return new;
-out_free_list:
- list_for_each_entry_safe(old, tmp, &new->head, list) {
- list_del(&old->list);
- kfree(old);
- }
out_free_path:
btrfs_free_path(path);
out_kfree:
- kfree(new);
+ free_sa_defrag_extent(new);
return NULL;
}
@@ -2708,8 +2711,14 @@ out:
btrfs_remove_ordered_extent(inode, ordered_extent);
/* for snapshot-aware defrag */
- if (new)
- relink_file_extents(new);
+ if (new) {
+ if (ret) {
+ free_sa_defrag_extent(new);
+ atomic_dec(&root->fs_info->defrag_running);
+ } else {
+ relink_file_extents(new);
+ }
+ }
/* once for us */
btrfs_put_ordered_extent(ordered_extent);
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