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btrfs: fiemap: preallocate ulists for btrfs_check_shared

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btrfs_check_shared looks up parents of a given extent and uses ulists
for that. These are allocated and freed repeatedly. Preallocation in the
caller will avoid the overhead and also allow us to use the GFP_KERNEL
as it is happens before the extent locks are taken.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba
2019-05-15 15:31:04 +02:00
parent 9b4e675a99
commit 5911c8fe05
3 changed files with 23 additions and 14 deletions
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17
fs/btrfs/extent_io.c
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@@ -4542,6 +4542,8 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
struct btrfs_path *path;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct fiemap_cache cache = { 0 };
struct ulist *roots;
struct ulist *tmp_ulist;
int end = 0;
u64 em_start = 0;
u64 em_len = 0;
@@ -4555,6 +4557,13 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
return -ENOMEM;
path->leave_spinning = 1;
roots = ulist_alloc(GFP_KERNEL);
tmp_ulist = ulist_alloc(GFP_KERNEL);
if (!roots || !tmp_ulist) {
ret = -ENOMEM;
goto out_free_ulist;
}
start = round_down(start, btrfs_inode_sectorsize(inode));
len = round_up(max, btrfs_inode_sectorsize(inode)) - start;
@@ -4566,7 +4575,7 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
btrfs_ino(BTRFS_I(inode)), -1, 0);
if (ret < 0) {
btrfs_free_path(path);
return ret;
goto out_free_ulist;
} else {
WARN_ON(!ret);
if (ret == 1)
@@ -4675,7 +4684,7 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
*/
ret = btrfs_check_shared(root,
btrfs_ino(BTRFS_I(inode)),
bytenr);
bytenr, roots, tmp_ulist);
if (ret < 0)
goto out_free;
if (ret)
@@ -4721,6 +4730,10 @@ out:
btrfs_free_path(path);
unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len - 1,
&cached_state);
out_free_ulist:
ulist_free(roots);
ulist_free(tmp_ulist);
return ret;
}