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btrfs: make btrfs_cleanup_fs_roots use the radix tree lock 

The radix root is primarily protected by the fs_roots_radix_lock, so use
that to lookup and get a ref on all of our fs roots in
btrfs_cleanup_fs_roots. The tree reference is taken in the protected
section as before.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2020-02-14 16:11:46 -05:00 committed by David Sterba
parent 4785e24fa5
commit efc3453494
1 changed files with 3 additions and 4 deletions
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7
fs/btrfs/disk-io.c
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@ -3932,15 +3932,14 @@ int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
int i = 0;
int err = 0;
unsigned int ret = 0;
int index;
while (1) {
index = srcu_read_lock(&fs_info->subvol_srcu);
spin_lock(&fs_info->fs_roots_radix_lock);
ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
(void **)gang, root_objectid,
ARRAY_SIZE(gang));
if (!ret) {
srcu_read_unlock(&fs_info->subvol_srcu, index);
spin_unlock(&fs_info->fs_roots_radix_lock);
break;
}
root_objectid = gang[ret - 1]->root_key.objectid + 1;
@ -3954,7 +3953,7 @@ int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
/* grab all the search result for later use */
gang[i] = btrfs_grab_root(gang[i]);
}
srcu_read_unlock(&fs_info->subvol_srcu, index);
spin_unlock(&fs_info->fs_roots_radix_lock);
for (i = 0; i < ret; i++) {
if (!gang[i])