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btrfs: move volume_mutex to callers of btrfs_rm_device

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Move locking and unlocking next to the BTRFS_FS_EXCL_OP bit manipulation
so it's obvious that the two happen at the same time.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2018-03-20 17:20:45 +01:00
parent d48f39d5a5
commit 72b81abf95
2 changed files with 4 additions and 2 deletions
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4
fs/btrfs/ioctl.c
View File

@ -2480,6 +2480,7 @@ static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg)
ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
goto out;
}
mutex_lock(&fs_info->volume_mutex);
if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) {
ret = btrfs_rm_device(fs_info, NULL, vol_args->devid);
@ -2487,6 +2488,7 @@ static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg)
vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
ret = btrfs_rm_device(fs_info, vol_args->name, 0);
}
mutex_unlock(&fs_info->volume_mutex);
clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
if (!ret) {
@ -2522,6 +2524,7 @@ static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
goto out_drop_write;
}
mutex_lock(&fs_info->volume_mutex);
vol_args = memdup_user(arg, sizeof(*vol_args));
if (IS_ERR(vol_args)) {
@ -2536,6 +2539,7 @@ static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
btrfs_info(fs_info, "disk deleted %s", vol_args->name);
kfree(vol_args);
out:
mutex_unlock(&fs_info->volume_mutex);
clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
out_drop_write:
mnt_drop_write_file(file);

2
fs/btrfs/volumes.c
View File

@ -1954,7 +1954,6 @@ int btrfs_rm_device(struct btrfs_fs_info *fs_info, const char *device_path,
u64 num_devices;
int ret = 0;
mutex_lock(&fs_info->volume_mutex);
mutex_lock(&uuid_mutex);
num_devices = fs_devices->num_devices;
@ -2068,7 +2067,6 @@ int btrfs_rm_device(struct btrfs_fs_info *fs_info, const char *device_path,
out:
mutex_unlock(&uuid_mutex);
mutex_unlock(&fs_info->volume_mutex);
return ret;
error_undo: