Merge tag 'for-5.4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

Pull btrfs updates from David Sterba:
 "This continues with work on code refactoring, sanity checks and space
  handling. There are some less user visible changes, nothing that would
  particularly stand out.

  User visible changes:
   - tree checker, more sanity checks of:
       - ROOT_ITEM (key, size, generation, level, alignment, flags)
       - EXTENT_ITEM and METADATA_ITEM checks (key, size, offset,
         alignment, refs)
       - tree block reference items
       - EXTENT_DATA_REF (key, hash, offset)

   - deprecate flag BTRFS_SUBVOL_CREATE_ASYNC for subvolume creation
     ioctl, scheduled removal in 5.7

   - delete stale and unused UAPI definitions
     BTRFS_DEV_REPLACE_ITEM_STATE_*

   - improved export of debugging information available via existing
     sysfs directory structure

   - try harder to delete relations between qgroups and allow to delete
     orphan entries

   - remove unreliable space checks before relocation starts

  Core:
   - space handling:
       - improved ticket reservations and other high level logic in
         order to remove special cases
       - factor flushing infrastructure and use it for different
         contexts, allows to remove some special case handling
       - reduce metadata reservation when only updating inodes
       - reduce global block reserve minimum size (affects small
         filesystems)
       - improved overcommit logic wrt global block reserve

   - tests:
       - fix memory leaks in extent IO tree
       - catch all TRIM range

  Fixes:
   - fix ENOSPC errors, leading to transaction aborts, when cloning
     extents

   - several fixes for inode number cache (mount option inode_cache)

   - fix potential soft lockups during send when traversing large trees

   - fix unaligned access to space cache pages with SLUB debug on
     (PowerPC)

  Other:
   - refactoring public/private functions, moving to new or more
     appropriate files

   - defines converted to enums

   - error handling improvements

   - more assertions and comments

   - old code deletion"

* tag 'for-5.4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: (138 commits)
  btrfs: Relinquish CPUs in btrfs_compare_trees
  btrfs: Don't assign retval of btrfs_try_tree_write_lock/btrfs_tree_read_lock_atomic
  btrfs: create structure to encode checksum type and length
  btrfs: turn checksum type define into an enum
  btrfs: add enospc debug messages for ticket failure
  btrfs: do not account global reserve in can_overcommit
  btrfs: use btrfs_try_granting_tickets in update_global_rsv
  btrfs: always reserve our entire size for the global reserve
  btrfs: change the minimum global reserve size
  btrfs: rename btrfs_space_info_add_old_bytes
  btrfs: remove orig_bytes from reserve_ticket
  btrfs: fix may_commit_transaction to deal with no partial filling
  btrfs: rework wake_all_tickets
  btrfs: refactor the ticket wakeup code
  btrfs: stop partially refilling tickets when releasing space
  btrfs: add space reservation tracepoint for reserved bytes
  btrfs: roll tracepoint into btrfs_space_info_update helper
  btrfs: do not allow reservations if we have pending tickets
  btrfs: stop clearing EXTENT_DIRTY in inode I/O tree
  btrfs: treat RWF_{,D}SYNC writes as sync for CRCs
  ...

1 files changed, 61 insertions, 12 deletions

diff --git a/fs/btrfs/struct-funcs.c b/fs/btrfs/struct-funcs.c
index 4c13b737f568..73f7987143df 100644
--- a/fs/btrfs/struct-funcs.c
+++ b/fs/btrfs/struct-funcs.c
@@ -33,6 +33,8 @@ static inline void put_unaligned_le8(u8 val, void *p)
  *
  * The extent buffer api is used to do the page spanning work required to
  * have a metadata blocksize different from the page size.
+ *
+ * There are 2 variants defined, one with a token pointer and one without.
  */
 
 #define DEFINE_BTRFS_SETGET_BITS(bits)					\
@@ -50,8 +52,10 @@ u##bits btrfs_get_token_##bits(const struct extent_buffer *eb,		\
 	int size = sizeof(u##bits);					\
 	u##bits res;							\
 									\
-	if (token && token->kaddr && token->offset <= offset &&		\
-	    token->eb == eb &&						\
+	ASSERT(token);							\
+	ASSERT(token->eb == eb);					\
+									\
+	if (token->kaddr && token->offset <= offset &&			\
 	   (token->offset + PAGE_SIZE >= offset + size)) {	\
 		kaddr = token->kaddr;					\
 		p = kaddr + part_offset - token->offset;		\
@@ -68,11 +72,33 @@ u##bits btrfs_get_token_##bits(const struct extent_buffer *eb,		\
 	}								\
 	p = kaddr + part_offset - map_start;				\
 	res = get_unaligned_le##bits(p + off);				\
-	if (token) {							\
-		token->kaddr = kaddr;					\
-		token->offset = map_start;				\
-		token->eb = eb;						\
+	token->kaddr = kaddr;						\
+	token->offset = map_start;					\
+	return res;							\
+}									\
+u##bits btrfs_get_##bits(const struct extent_buffer *eb,		\
+			 const void *ptr, unsigned long off)		\
+{									\
+	unsigned long part_offset = (unsigned long)ptr;			\
+	unsigned long offset = part_offset + off;			\
+	void *p;							\
+	int err;							\
+	char *kaddr;							\
+	unsigned long map_start;					\
+	unsigned long map_len;						\
+	int size = sizeof(u##bits);					\
+	u##bits res;							\
+									\
+	err = map_private_extent_buffer(eb, offset, size,		\
+					&kaddr, &map_start, &map_len);	\
+	if (err) {							\
+		__le##bits leres;					\
+									\
+		read_extent_buffer(eb, &leres, offset, size);		\
+		return le##bits##_to_cpu(leres);			\
 	}								\
+	p = kaddr + part_offset - map_start;				\
+	res = get_unaligned_le##bits(p + off);				\
 	return res;							\
 }									\
 void btrfs_set_token_##bits(struct extent_buffer *eb,			\
@@ -89,8 +115,10 @@ void btrfs_set_token_##bits(struct extent_buffer *eb,			\
 	unsigned long map_len;						\
 	int size = sizeof(u##bits);					\
 									\
-	if (token && token->kaddr && token->offset <= offset &&		\
-	    token->eb == eb &&						\
+	ASSERT(token);							\
+	ASSERT(token->eb == eb);					\
+									\
+	if (token->kaddr && token->offset <= offset &&			\
 	   (token->offset + PAGE_SIZE >= offset + size)) {	\
 		kaddr = token->kaddr;					\
 		p = kaddr + part_offset - token->offset;		\
@@ -108,11 +136,32 @@ void btrfs_set_token_##bits(struct extent_buffer *eb,			\
 	}								\
 	p = kaddr + part_offset - map_start;				\
 	put_unaligned_le##bits(val, p + off);				\
-	if (token) {							\
-		token->kaddr = kaddr;					\
-		token->offset = map_start;				\
-		token->eb = eb;						\
+	token->kaddr = kaddr;						\
+	token->offset = map_start;					\
+}									\
+void btrfs_set_##bits(struct extent_buffer *eb, void *ptr,		\
+		      unsigned long off, u##bits val)			\
+{									\
+	unsigned long part_offset = (unsigned long)ptr;			\
+	unsigned long offset = part_offset + off;			\
+	void *p;							\
+	int err;							\
+	char *kaddr;							\
+	unsigned long map_start;					\
+	unsigned long map_len;						\
+	int size = sizeof(u##bits);					\
+									\
+	err = map_private_extent_buffer(eb, offset, size,		\
+			&kaddr, &map_start, &map_len);			\
+	if (err) {							\
+		__le##bits val2;					\
+									\
+		val2 = cpu_to_le##bits(val);				\
+		write_extent_buffer(eb, &val2, offset, size);		\
+		return;							\
 	}								\
+	p = kaddr + part_offset - map_start;				\
+	put_unaligned_le##bits(val, p + off);				\
 }
 
 DEFINE_BTRFS_SETGET_BITS(8)