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-rw-r--r--fs/btrfs/super.c60
1 files changed, 38 insertions, 22 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index d04db81..5011aad 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -66,6 +66,8 @@
static const struct super_operations btrfs_super_ops;
static struct file_system_type btrfs_fs_type;
+static int btrfs_remount(struct super_block *sb, int *flags, char *data);
+
static const char *btrfs_decode_error(int errno)
{
char *errstr = "unknown";
@@ -1185,6 +1187,26 @@ static struct dentry *mount_subvol(const char *subvol_name, int flags,
mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name,
newargs);
kfree(newargs);
+
+ if (PTR_RET(mnt) == -EBUSY) {
+ if (flags & MS_RDONLY) {
+ mnt = vfs_kern_mount(&btrfs_fs_type, flags & ~MS_RDONLY, device_name,
+ newargs);
+ } else {
+ int r;
+ mnt = vfs_kern_mount(&btrfs_fs_type, flags | MS_RDONLY, device_name,
+ newargs);
+ if (IS_ERR(mnt))
+ return ERR_CAST(mnt);
+
+ r = btrfs_remount(mnt->mnt_sb, &flags, NULL);
+ if (r < 0) {
+ /* FIXME: release vfsmount mnt ??*/
+ return ERR_PTR(r);
+ }
+ }
+ }
+
if (IS_ERR(mnt))
return ERR_CAST(mnt);
@@ -1305,13 +1327,6 @@ error_fs_info:
return ERR_PTR(error);
}
-static void btrfs_set_max_workers(struct btrfs_workers *workers, int new_limit)
-{
- spin_lock_irq(&workers->lock);
- workers->max_workers = new_limit;
- spin_unlock_irq(&workers->lock);
-}
-
static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info,
int new_pool_size, int old_pool_size)
{
@@ -1323,21 +1338,20 @@ static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info,
btrfs_info(fs_info, "resize thread pool %d -> %d",
old_pool_size, new_pool_size);
- btrfs_set_max_workers(&fs_info->generic_worker, new_pool_size);
- btrfs_set_max_workers(&fs_info->workers, new_pool_size);
- btrfs_set_max_workers(&fs_info->delalloc_workers, new_pool_size);
- btrfs_set_max_workers(&fs_info->submit_workers, new_pool_size);
- btrfs_set_max_workers(&fs_info->caching_workers, new_pool_size);
- btrfs_set_max_workers(&fs_info->fixup_workers, new_pool_size);
- btrfs_set_max_workers(&fs_info->endio_workers, new_pool_size);
- btrfs_set_max_workers(&fs_info->endio_meta_workers, new_pool_size);
- btrfs_set_max_workers(&fs_info->endio_meta_write_workers, new_pool_size);
- btrfs_set_max_workers(&fs_info->endio_write_workers, new_pool_size);
- btrfs_set_max_workers(&fs_info->endio_freespace_worker, new_pool_size);
- btrfs_set_max_workers(&fs_info->delayed_workers, new_pool_size);
- btrfs_set_max_workers(&fs_info->readahead_workers, new_pool_size);
- btrfs_set_max_workers(&fs_info->scrub_wr_completion_workers,
- new_pool_size);
+ btrfs_workqueue_set_max(fs_info->workers, new_pool_size);
+ btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size);
+ btrfs_workqueue_set_max(fs_info->submit_workers, new_pool_size);
+ btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size);
+ btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size);
+ btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size);
+ btrfs_workqueue_set_max(fs_info->endio_meta_write_workers,
+ new_pool_size);
+ btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size);
+ btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size);
+ btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size);
+ btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size);
+ btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers,
+ new_pool_size);
}
static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info)
@@ -1388,6 +1402,7 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
unsigned int old_metadata_ratio = fs_info->metadata_ratio;
int ret;
+ sync_filesystem(sb);
btrfs_remount_prepare(fs_info);
ret = btrfs_parse_options(root, data);
@@ -1479,6 +1494,7 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
sb->s_flags &= ~MS_RDONLY;
}
out:
+ wake_up_process(fs_info->transaction_kthread);
btrfs_remount_cleanup(fs_info, old_opts);
return 0;
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