This is a note to let you know that I've just added the patch titled
ext4: do not polute the extents cache while shifting extents
to the 4.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ext4-do-not-polute-the-extents-cache-while-shifting-extents.patch
and it can be found in the queue-4.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 03e916fa8b5577d85471452a3d0c5738aa658dae Mon Sep 17 00:00:00 2001
From: Roman Pen <roman.penyaev@xxxxxxxxxxxxxxxx>
Date: Sun, 8 Jan 2017 21:00:35 -0500
Subject: ext4: do not polute the extents cache while shifting extents
From: Roman Pen <roman.penyaev@xxxxxxxxxxxxxxxx>
commit 03e916fa8b5577d85471452a3d0c5738aa658dae upstream.
Inside ext4_ext_shift_extents() function ext4_find_extent() is called
without EXT4_EX_NOCACHE flag, which should prevent cache population.
This leads to oudated offsets in the extents tree and wrong blocks
afterwards.
Patch fixes the problem providing EXT4_EX_NOCACHE flag for each
ext4_find_extents() call inside ext4_ext_shift_extents function.
Fixes: 331573febb6a2
Signed-off-by: Roman Pen <roman.penyaev@xxxxxxxxxxxxxxxx>
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Cc: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
Cc: Andreas Dilger <adilger.kernel@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ext4/extents.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -5334,7 +5334,8 @@ ext4_ext_shift_extents(struct inode *ino
ext4_lblk_t stop, *iterator, ex_start, ex_end;
/* Let path point to the last extent */
- path = ext4_find_extent(inode, EXT_MAX_BLOCKS - 1, NULL, 0);
+ path = ext4_find_extent(inode, EXT_MAX_BLOCKS - 1, NULL,
+ EXT4_EX_NOCACHE);
if (IS_ERR(path))
return PTR_ERR(path);
@@ -5350,7 +5351,8 @@ ext4_ext_shift_extents(struct inode *ino
* sure the hole is big enough to accommodate the shift.
*/
if (SHIFT == SHIFT_LEFT) {
- path = ext4_find_extent(inode, start - 1, &path, 0);
+ path = ext4_find_extent(inode, start - 1, &path,
+ EXT4_EX_NOCACHE);
if (IS_ERR(path))
return PTR_ERR(path);
depth = path->p_depth;
@@ -5388,7 +5390,8 @@ ext4_ext_shift_extents(struct inode *ino
* becomes NULL to indicate the end of the loop.
*/
while (iterator && start <= stop) {
- path = ext4_find_extent(inode, *iterator, &path, 0);
+ path = ext4_find_extent(inode, *iterator, &path,
+ EXT4_EX_NOCACHE);
if (IS_ERR(path))
return PTR_ERR(path);
depth = path->p_depth;
Patches currently in stable-queue which might be from roman.penyaev@xxxxxxxxxxxxxxxx are
queue-4.10/ext4-include-forgotten-start-block-on-fallocate-insert-range.patch
queue-4.10/ext4-do-not-polute-the-extents-cache-while-shifting-extents.patch