[4/5] ext4: Discard preallocations after removing space

Submitted by Lukas Czerner on April 16, 2014, 6:33 p.m.


Message ID 1397673182-5326-4-git-send-email-lczerner@redhat.com
State Accepted, archived
Headers show

Commit Message

Lukas Czerner April 16, 2014, 6:33 p.m.
Currently in ext4_collapse_range() and ext4_punch_hole() we're
discarding preallocation twice. Once before we attempt to do any changes
and second time after we're done with the changes.

While the second call to ext4_discard_preallocations() in
ext4_punch_hole() case is not needed, we need to discard preallocation
right after ext4_ext_remove_space() in collapse range case because in
the case we had to restart a transaction in the middle of removing space
we might have new preallocations created.

Remove unneeded ext4_discard_preallocations() ext4_punch_hole() and move
it to the better place in ext4_collapse_range()

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
 fs/ext4/extents.c | 2 +-
 fs/ext4/inode.c   | 1 -
 2 files changed, 1 insertion(+), 2 deletions(-)

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diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 9cd762c..84bb668 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -5433,6 +5433,7 @@  int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len)
 		goto out_stop;
+	ext4_discard_preallocations(inode);
 	ret = ext4_ext_shift_extents(inode, handle, punch_stop,
 				     punch_stop - punch_start);
@@ -5445,7 +5446,6 @@  int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len)
 	i_size_write(inode, new_size);
 	EXT4_I(inode)->i_disksize = new_size;
-	ext4_discard_preallocations(inode);
 	if (IS_SYNC(inode))
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 56f1ff4..8765d49 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3613,7 +3613,6 @@  int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length)
 		ret = ext4_free_hole_blocks(handle, inode, first_block,
-	ext4_discard_preallocations(inode);
 	if (IS_SYNC(inode))