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ext4: do not polute the extents cache while shifting extents 

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: 331573febb
Signed-off-by: Roman Pen <roman.penyaev@profitbricks.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: Namjae Jeon <namjae.jeon@samsung.com>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: stable@vger.kernel.org
This commit is contained in:
Roman Pen 2017-01-08 21:00:35 -05:00 committed by Theodore Ts'o
parent 2a9b8cba62
commit 03e916fa8b
1 changed files with 6 additions and 3 deletions
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9
fs/ext4/extents.c
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@ -5334,7 +5334,8 @@ ext4_ext_shift_extents(struct inode *inode, handle_t *handle,
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 *inode, handle_t *handle,
* 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 *inode, handle_t *handle,
* 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;