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ext4: reuse path object in ext4_move_extents() 

Reuse the path object in ext4_move_extents() so we don't unnecessarily
free and reallocate it.

Also clean up the get_ext_path() wrapper so that it has the same
semantics of freeing the path object on error as ext4_ext_find_extent().

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2014-09-01 14:42:09 -04:00
parent ee4bd0d963
commit 3bdf14b4d7
1 changed files with 12 additions and 15 deletions
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27
fs/ext4/move_extent.c
View File

@ -32,20 +32,21 @@
*/
static inline int
get_ext_path(struct inode *inode, ext4_lblk_t lblock,
struct ext4_ext_path **orig_path)
struct ext4_ext_path **ppath)
{
int ret = 0;
struct ext4_ext_path *path;
path = ext4_ext_find_extent(inode, lblock, orig_path, EXT4_EX_NOCACHE);
path = ext4_ext_find_extent(inode, lblock, ppath, EXT4_EX_NOCACHE);
if (IS_ERR(path))
ret = PTR_ERR(path);
else if (path[ext_depth(inode)].p_ext == NULL)
ret = -ENODATA;
else
*orig_path = path;
return ret;
return PTR_ERR(path);
if (path[ext_depth(inode)].p_ext == NULL) {
ext4_ext_drop_refs(path);
kfree(path);
*ppath = NULL;
return -ENODATA;
}
*ppath = path;
return 0;
}
/**
@ -667,7 +668,7 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk,
}
d_start += next_blk - o_start;
o_start = next_blk;
goto repeat;
continue;
/* Check hole after the start pos */
} else if (cur_blk > o_start) {
/* Skip hole */
@ -708,10 +709,6 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk,
break;
o_start += cur_len;
d_start += cur_len;
repeat:
ext4_ext_drop_refs(path);
kfree(path);
path = NULL;
}
*moved_len = o_start - orig_blk;
if (*moved_len > len)