Conditionally remove all cached extents belonging to an inode
when truncating its inline data. It's only necessary to attempt to
remove cached extents when a conversion from inline to extent storage
has been initiated (!EXT4_STATE_MAY_INLINE_DATA). This avoids
unnecessary es lock overhead in the more common inline case.
Signed-off-by: Eric Whitney <enwlinux@xxxxxxxxx>
---
fs/ext4/inline.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
index 70cb64db33f7..49b0b4fcea6d 100644
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c
@@ -7,6 +7,7 @@
#include <linux/iomap.h>
#include <linux/fiemap.h>
#include <linux/iversion.h>
+#include <linux/backing-dev.h>
#include "ext4_jbd2.h"
#include "ext4.h"
@@ -1903,6 +1904,24 @@ int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
EXT4_I(inode)->i_disksize = i_size;
if (i_size < inline_size) {
+ /*
+ * if there's inline data to truncate and this file was
+ * converted to extents after that inline data was written,
+ * the extent status cache must be cleared to avoid leaving
+ * behind stale delayed allocated extent entries
+ */
+ if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
+retry:
+ err = ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
+ if (err == -ENOMEM) {
+ cond_resched();
+ congestion_wait(BLK_RW_ASYNC, HZ/50);
+ goto retry;
+ }
+ if (err)
+ goto out_error;
+ }
+
/* Clear the content in the xattr space. */
if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
--
2.20.1
