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Subject[PATCH 3.11 012/208] Btrfs: do not run snapshot-aware defragment on error
Date
3.11.10.3 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Liu Bo <bo.li.liu@oracle.com>

commit 6f519564d7d978c00351d9ab6abac3deeac31621 upstream.

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>
Cc: David Sterba <dsterba@suse.cz>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
---
fs/btrfs/inode.c | 47 ++++++++++++++++++++++++++++-------------------
1 file changed, 28 insertions(+), 19 deletions(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 8220491..5a4bc34 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2452,10 +2452,23 @@ 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;
@@ -2498,16 +2511,11 @@ 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 *
@@ -2517,7 +2525,7 @@ 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;

@@ -2565,7 +2573,7 @@ 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;
@@ -2594,7 +2602,7 @@ 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);
@@ -2616,15 +2624,10 @@ 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;
}

@@ -2776,8 +2779,14 @@ 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);
--
1.8.3.2


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