btrfs: defrag: make readahead state allocation failure non-fatal
All sorts of readahead errors are not considered fatal. We can continue
defragmentation without it, with some potential slow down, which will
last only for the current inode.
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 4d1b07b..496e873b 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1273,14 +1273,14 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
extent_thresh = SZ_256K;
/*
- * if we were not given a file, allocate a readahead
- * context
+ * If we were not given a file, allocate a readahead context. As
+ * readahead is just an optimization, defrag will work without it so
+ * we don't error out.
*/
if (!file) {
ra = kzalloc(sizeof(*ra), GFP_KERNEL);
- if (!ra)
- return -ENOMEM;
- file_ra_state_init(ra, inode->i_mapping);
+ if (ra)
+ file_ra_state_init(ra, inode->i_mapping);
} else {
ra = &file->f_ra;
}
@@ -1363,8 +1363,9 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
if (i + cluster > ra_index) {
ra_index = max(i, ra_index);
- btrfs_force_ra(inode->i_mapping, ra, file, ra_index,
- cluster);
+ if (ra)
+ btrfs_force_ra(inode->i_mapping, ra, file,
+ ra_index, cluster);
ra_index += cluster;
}