summaryrefslogtreecommitdiff
path: root/fs/ext4/extents.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/ext4/extents.c')
-rw-r--r--fs/ext4/extents.c27
1 files changed, 18 insertions, 9 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 3e295d3350a9..2a97dff87b96 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -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);
@@ -5343,15 +5344,15 @@ ext4_ext_shift_extents(struct inode *inode, handle_t *handle,
if (!extent)
goto out;
- stop = le32_to_cpu(extent->ee_block) +
- ext4_ext_get_actual_len(extent);
+ stop = le32_to_cpu(extent->ee_block);
/*
* In case of left shift, Don't start shifting extents until we make
* 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;
@@ -5383,9 +5384,14 @@ ext4_ext_shift_extents(struct inode *inode, handle_t *handle,
else
iterator = &stop;
- /* Its safe to start updating extents */
- while (start < stop) {
- path = ext4_find_extent(inode, *iterator, &path, 0);
+ /*
+ * Its safe to start updating extents. Start and stop are unsigned, so
+ * in case of right shift if extent with 0 block is reached, iterator
+ * becomes NULL to indicate the end of the loop.
+ */
+ while (iterator && start <= stop) {
+ path = ext4_find_extent(inode, *iterator, &path,
+ EXT4_EX_NOCACHE);
if (IS_ERR(path))
return PTR_ERR(path);
depth = path->p_depth;
@@ -5412,8 +5418,11 @@ ext4_ext_shift_extents(struct inode *inode, handle_t *handle,
ext4_ext_get_actual_len(extent);
} else {
extent = EXT_FIRST_EXTENT(path[depth].p_hdr);
- *iterator = le32_to_cpu(extent->ee_block) > 0 ?
- le32_to_cpu(extent->ee_block) - 1 : 0;
+ if (le32_to_cpu(extent->ee_block) > 0)
+ *iterator = le32_to_cpu(extent->ee_block) - 1;
+ else
+ /* Beginning is reached, end of the loop */
+ iterator = NULL;
/* Update path extent in case we need to stop */
while (le32_to_cpu(extent->ee_block) < start)
extent++;