diff options
| author | David Sterba <dsterba@suse.com> | 2018-06-19 17:50:25 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2018-08-06 13:12:47 +0200 |
| commit | 5139cff598d42b1e531f40c84691a7e945f04553 (patch) | |
| tree | 974a8bdbdb8270a79f358173866eb7a0c1c9a5f1 /fs/btrfs/super.c | |
| parent | f5194e34cabaddd348a90f950e0a8188dd26cdc0 (diff) | |
| download | linux-5139cff598d42b1e531f40c84691a7e945f04553.tar.gz | |
btrfs: lift uuid_mutex to callers of btrfs_parse_early_options
Prepartory work to fix race between mount and device scan. btrfs_parse_early_options calls the device scan from mount and we'll need to let mount completely manage the critical section. Reviewed-by: Anand Jain <anand.jain@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/super.c')
| -rw-r--r-- | fs/btrfs/super.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index d470eb6b9226..de87b7b0367d 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -890,6 +890,8 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags, char *device_name, *opts, *orig, *p; int error = 0; + lockdep_assert_held(&uuid_mutex); + if (!options) return 0; @@ -915,10 +917,8 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags, error = -ENOMEM; goto out; } - mutex_lock(&uuid_mutex); error = btrfs_scan_one_device(device_name, flags, holder, fs_devices); - mutex_unlock(&uuid_mutex); kfree(device_name); if (error) goto out; @@ -1526,8 +1526,10 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type, if (!(flags & SB_RDONLY)) mode |= FMODE_WRITE; + mutex_lock(&uuid_mutex); error = btrfs_parse_early_options(data, mode, fs_type, &fs_devices); + mutex_unlock(&uuid_mutex); if (error) { return ERR_PTR(error); } |