Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

Pull ext4 updates from Ted Ts'o:
 "There are a number of major cleanups in ext4 this cycle:

   - The data=journal writepath has been significantly cleaned up and
     simplified, and reduces a large number of data=journal special
     cases by Jan Kara.

   - Ojaswin Muhoo has replaced linked list used to track extents that
     have been used for inode preallocation with a red-black tree in the
     multi-block allocator. This improves performance for workloads
     which do a large number of random allocating writes.

   - Thanks to Kemeng Shi for a lot of cleanup and bug fixes in the
     multi-block allocator.

   - Matthew wilcox has converted the code paths for reading and writing
     ext4 pages to use folios.

   - Jason Yan has continued to factor out ext4_fill_super() into
     smaller functions for improve ease of maintenance and
     comprehension.

   - Josh Triplett has created an uapi header for ext4 userspace API's"

* tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (105 commits)
  ext4: Add a uapi header for ext4 userspace APIs
  ext4: remove useless conditional branch code
  ext4: remove unneeded check of nr_to_submit
  ext4: move dax and encrypt checking into ext4_check_feature_compatibility()
  ext4: factor out ext4_block_group_meta_init()
  ext4: move s_reserved_gdt_blocks and addressable checking into ext4_check_geometry()
  ext4: rename two functions with 'check'
  ext4: factor out ext4_flex_groups_free()
  ext4: use ext4_group_desc_free() in ext4_put_super() to save some duplicated code
  ext4: factor out ext4_percpu_param_init() and ext4_percpu_param_destroy()
  ext4: factor out ext4_hash_info_init()
  Revert "ext4: Fix warnings when freezing filesystem with journaled data"
  ext4: Update comment in mpage_prepare_extent_to_map()
  ext4: Simplify handling of journalled data in ext4_bmap()
  ext4: Drop special handling of journalled data from ext4_quota_on()
  ext4: Drop special handling of journalled data from ext4_evict_inode()
  ext4: Fix special handling of journalled data from extent zeroing
  ext4: Drop special handling of journalled data from extent shifting operations
  ext4: Drop special handling of journalled data from ext4_sync_file()
  ext4: Commit transaction before writing back pages in data=journal mode
  ...

1 files changed, 9 insertions, 8 deletions

diff --git a/fs/ext4/mballoc.h b/fs/ext4/mballoc.h
index dcda2a943cee..6d85ee8674a6 100644
--- a/fs/ext4/mballoc.h
+++ b/fs/ext4/mballoc.h
@@ -74,11 +74,6 @@
 #define MB_DEFAULT_GROUP_PREALLOC	512
 
 /*
- * maximum length of inode prealloc list
- */
-#define MB_DEFAULT_MAX_INODE_PREALLOC	512
-
-/*
  * Number of groups to search linearly before performing group scanning
  * optimization.
  */
@@ -114,7 +109,10 @@ struct ext4_free_data {
 };
 
 struct ext4_prealloc_space {
-	struct list_head	pa_inode_list;
+	union {
+		struct rb_node	inode_node;		/* for inode PA rbtree */
+		struct list_head	lg_list;	/* for lg PAs */
+	} pa_node;
 	struct list_head	pa_group_list;
 	union {
 		struct list_head pa_tmp_list;
@@ -128,8 +126,11 @@ struct ext4_prealloc_space {
 	ext4_grpblk_t		pa_len;		/* len of preallocated chunk */
 	ext4_grpblk_t		pa_free;	/* how many blocks are free */
 	unsigned short		pa_type;	/* pa type. inode or group */
-	spinlock_t		*pa_obj_lock;
-	struct inode		*pa_inode;	/* hack, for history only */
+	union {
+		rwlock_t		*inode_lock;	/* locks the rbtree holding this PA */
+		spinlock_t		*lg_lock;	/* locks the lg list holding this PA */
+	} pa_node_lock;
+	struct inode		*pa_inode;	/* used to get the inode during group discard */
 };
 
 enum {