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authorTheodore Ts'o <tytso@mit.edu>2014-09-01 18:41:09 (GMT)
committerTheodore Ts'o <tytso@mit.edu>2014-09-01 18:41:09 (GMT)
commitee4bd0d963b75cbad9bfb59b547146671c7a655a (patch)
tree45b8284324939d19a418c6ab1ec4e94dff44c53f /fs/ext4/extents.c
parent10809df84a4d868db61af621bae3658494165279 (diff)
downloadlinux-ee4bd0d963b75cbad9bfb59b547146671c7a655a.tar.xz
ext4: reuse path object in ext4_ext_shift_extents()
Now that the semantics of ext4_ext_find_extent() are much cleaner, it's safe and more efficient to reuse the path object across the multiple calls to ext4_ext_find_extent() in ext4_ext_shift_extents(). Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/extents.c')
-rw-r--r--fs/ext4/extents.c25
1 files changed, 8 insertions, 17 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index c94c748..22828e4 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -5306,26 +5306,21 @@ ext4_ext_shift_extents(struct inode *inode, handle_t *handle,
depth = path->p_depth;
extent = path[depth].p_ext;
- if (!extent) {
- ext4_ext_drop_refs(path);
- kfree(path);
- return ret;
- }
+ if (!extent)
+ goto out;
stop_block = le32_to_cpu(extent->ee_block) +
ext4_ext_get_actual_len(extent);
- ext4_ext_drop_refs(path);
- kfree(path);
/* Nothing to shift, if hole is at the end of file */
if (start >= stop_block)
- return ret;
+ goto out;
/*
* Don't start shifting extents until we make sure the hole is big
* enough to accomodate the shift.
*/
- path = ext4_ext_find_extent(inode, start - 1, NULL, 0);
+ path = ext4_ext_find_extent(inode, start - 1, &path, 0);
if (IS_ERR(path))
return PTR_ERR(path);
depth = path->p_depth;
@@ -5338,8 +5333,6 @@ ext4_ext_shift_extents(struct inode *inode, handle_t *handle,
ex_start = 0;
ex_end = 0;
}
- ext4_ext_drop_refs(path);
- kfree(path);
if ((start == ex_start && shift > ex_start) ||
(shift > start - ex_end))
@@ -5347,7 +5340,7 @@ ext4_ext_shift_extents(struct inode *inode, handle_t *handle,
/* Its safe to start updating extents */
while (start < stop_block) {
- path = ext4_ext_find_extent(inode, start, NULL, 0);
+ path = ext4_ext_find_extent(inode, start, &path, 0);
if (IS_ERR(path))
return PTR_ERR(path);
depth = path->p_depth;
@@ -5363,19 +5356,17 @@ ext4_ext_shift_extents(struct inode *inode, handle_t *handle,
path[depth].p_ext++;
} else {
start = ext4_ext_next_allocated_block(path);
- ext4_ext_drop_refs(path);
- kfree(path);
continue;
}
}
ret = ext4_ext_shift_path_extents(path, shift, inode,
handle, &start);
- ext4_ext_drop_refs(path);
- kfree(path);
if (ret)
break;
}
-
+out:
+ ext4_ext_drop_refs(path);
+ kfree(path);
return ret;
}