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ext4: reuse path object in ext4_ext_shift_extents()

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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>
This commit is contained in:
Theodore Ts'o 2014-09-01 14:41:09 -04:00
parent 10809df84a
commit ee4bd0d963
1 changed files with 8 additions and 17 deletions
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25
fs/ext4/extents.c
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@ -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;
}