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authorBoris Burkov <boris@bur.io>2020-11-19 02:06:16 +0300
committerDavid Sterba <dsterba@suse.com>2020-12-09 21:16:07 +0300
commit44c0ca211a4da92513fffc545b5374b45b0c4fc5 (patch)
treed9ef2689a16c4b8a1b355b4399bd374581cb5bbc /fs/btrfs/disk-io.h
parent47876f7ceffa0e6af7476e052b3c061f1f2c1d9f (diff)
downloadlinux-44c0ca211a4da92513fffc545b5374b45b0c4fc5.tar.xz
btrfs: lift read-write mount setup from mount and remount
Mounting rw and remounting from ro to rw naturally share invariants and functionality which result in a correctly setup rw filesystem. Luckily, there is even a strong unity in the code which implements them. In mount's open_ctree, these operations mostly happen after an early return for ro file systems, and in remount, they happen in a section devoted to remounting ro->rw, after some remount specific validation passes. However, there are unfortunately a few differences. There are small deviations in the order of some of the operations, remount does not start orphan cleanup in root_tree or fs_tree, remount does not create the free space tree, and remount does not handle "one-shot" mount options like clear_cache and uuid tree rescan. Since we want to add building the free space tree to remount, and also to start the same orphan cleanup process on a filesystem mounted as ro then remounted rw, we would benefit from unifying the logic between the two code paths. This patch only lifts the existing common functionality, and leaves a natural path for fixing the discrepancies. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Boris Burkov <boris@bur.io> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/disk-io.h')
-rw-r--r--fs/btrfs/disk-io.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 984410144a97..b509d1a490e7 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -50,6 +50,7 @@ struct extent_buffer *btrfs_find_create_tree_block(
u64 bytenr, u64 owner_root,
int level);
void btrfs_clean_tree_block(struct extent_buffer *buf);
+int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info);
int __cold open_ctree(struct super_block *sb,
struct btrfs_fs_devices *fs_devices,
char *options);