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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 <enwlinux@gmail.com>
Link: https://lore.kernel.org/r/20220722163910.268564-1-enwlinux@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Eric Whitney 2022-07-22 12:39:10 -04:00 committed by Theodore Ts'o
parent df3cb754d1
commit d412df530f
1 changed files with 7 additions and 9 deletions
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16
fs/ext4/move_extent.c
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@ -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: