2022-07-22 16:49:59

by Eric Whitney

Subject: [PATCH v2] ext4: minor defrag code improvements

Modify the error returns for two file types that can't be defragged to
more clearly communicate those restrictions to a caller. When the
defrag code is applied to swap files, return -ETXTBSY, and when applied
to quota files, return -EOPNOTSUPP. Move an extent tree search whose
results are only occasionally required to the site always requiring them
for improved efficiency. Address a few typos.

Signed-off-by: Eric Whitney <[email protected]>
---
fs/ext4/move_extent.c | 16 +++++++---------
1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index 701f1d6a217f..2b83621d16e2 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -472,19 +472,17 @@ mext_check_arguments(struct inode *orig_inode,
if (IS_IMMUTABLE(donor_inode) || IS_APPEND(donor_inode))
return -EPERM;

- /* Ext4 move extent does not support swapfile */
+ /* Ext4 move extent does not support swap files */
if (IS_SWAPFILE(orig_inode) || IS_SWAPFILE(donor_inode)) {
- ext4_debug("ext4 move extent: The argument files should "
- "not be swapfile [ino:orig %lu, donor %lu]\n",
+ ext4_debug("ext4 move extent: The argument files should not be swap files [ino:orig %lu, donor %lu]\n",
orig_inode->i_ino, donor_inode->i_ino);
- return -EBUSY;
+ return -ETXTBSY;
}

if (ext4_is_quota_file(orig_inode) && ext4_is_quota_file(donor_inode)) {
- ext4_debug("ext4 move extent: The argument files should "
- "not be quota files [ino:orig %lu, donor %lu]\n",
+ ext4_debug("ext4 move extent: The argument files should not be quota files [ino:orig %lu, donor %lu]\n",
orig_inode->i_ino, donor_inode->i_ino);
- return -EBUSY;
+ return -EOPNOTSUPP;
}

/* Ext4 move extent supports only extent based file */
@@ -631,11 +629,11 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk,
if (ret)
goto out;
ex = path[path->p_depth].p_ext;
- next_blk = ext4_ext_next_allocated_block(path);
cur_blk = le32_to_cpu(ex->ee_block);
cur_len = ext4_ext_get_actual_len(ex);
/* Check hole before the start pos */
if (cur_blk + cur_len - 1 < o_start) {
+ next_blk = ext4_ext_next_allocated_block(path);
if (next_blk == EXT_MAX_BLOCKS) {
ret = -ENODATA;
goto out;
@@ -663,7 +661,7 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk,
donor_page_index = d_start >> (PAGE_SHIFT -
donor_inode->i_blkbits);
offset_in_page = o_start % blocks_per_page;
- if (cur_len > blocks_per_page- offset_in_page)
+ if (cur_len > blocks_per_page - offset_in_page)
cur_len = blocks_per_page - offset_in_page;
/*
* Up semaphore to avoid following problems:
--
2.30.2

2022-09-27 21:54:56

by Theodore Ts'o

Subject: Re: [PATCH v2] ext4: minor defrag code improvements

On Fri, 22 Jul 2022 12:39:10 -0400, Eric Whitney wrote:
> Modify the error returns for two file types that can't be defragged to
> more clearly communicate those restrictions to a caller. When the
> defrag code is applied to swap files, return -ETXTBSY, and when applied
> to quota files, return -EOPNOTSUPP. Move an extent tree search whose
> results are only occasionally required to the site always requiring them
> for improved efficiency. Address a few typos.
>
> [...]

Applied, thanks!

[1/1] ext4: minor defrag code improvements
commit: d412df530f77d0f61c41b83f925997452fc3944c

Best regards,
--
Theodore Ts'o <[email protected]>