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

Pull ext4 updates from Ted Ts'o:
 "A lot of bug fixes and cleanups for ext4, including:

   - Fix performance problems found in dioread_nolock now that it is the
     default, caused by transaction leaks.

   - Clean up fiemap handling in ext4

   - Clean up and refactor multiple block allocator (mballoc) code

   - Fix a problem with mballoc with a smaller file systems running out
     of blocks because they couldn't properly use blocks that had been
     reserved by inode preallocation.

   - Fixed a race in ext4_sync_parent() versus rename()

   - Simplify the error handling in the extent manipulation code

   - Make sure all metadata I/O errors are felected to
     ext4_ext_dirty()'s and ext4_make_inode_dirty()'s callers.

   - Avoid passing an error pointer to brelse in ext4_xattr_set()

   - Fix race which could result to freeing an inode on the dirty last
     in data=journal mode.

   - Fix refcount handling if ext4_iget() fails

   - Fix a crash in generic/019 caused by a corrupted extent node"

* tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (58 commits)
  ext4: avoid unnecessary transaction starts during writeback
  ext4: don't block for O_DIRECT if IOCB_NOWAIT is set
  ext4: remove the access_ok() check in ext4_ioctl_get_es_cache
  fs: remove the access_ok() check in ioctl_fiemap
  fs: handle FIEMAP_FLAG_SYNC in fiemap_prep
  fs: move fiemap range validation into the file systems instances
  iomap: fix the iomap_fiemap prototype
  fs: move the fiemap definitions out of fs.h
  fs: mark __generic_block_fiemap static
  ext4: remove the call to fiemap_check_flags in ext4_fiemap
  ext4: split _ext4_fiemap
  ext4: fix fiemap size checks for bitmap files
  ext4: fix EXT4_MAX_LOGICAL_BLOCK macro
  add comment for ext4_dir_entry_2 file_type member
  jbd2: avoid leaking transaction credits when unreserving handle
  ext4: drop ext4_journal_free_reserved()
  ext4: mballoc: use lock for checking free blocks while retrying
  ext4: mballoc: refactor ext4_mb_good_group()
  ext4: mballoc: introduce pcpu seqcnt for freeing PA to improve ENOSPC handling
  ext4: mballoc: refactor ext4_mb_discard_preallocations()
  ...

Author: torvalds

Documentation/filesystems/fiemap.rst

@@ -206,16 +206,18 @@ EINTR once fatal signal received.
 
 
 Flag checking should be done at the beginning of the ->fiemap callback via the
-fiemap_check_flags() helper::
+fiemap_prep() helper::
 
-  int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);
+  int fiemap_prep(struct inode *inode, struct fiemap_extent_info *fieinfo,
+		  u64 start, u64 *len, u32 supported_flags);
 
 The struct fieinfo should be passed in as received from ioctl_fiemap(). The
 set of fiemap flags which the fs understands should be passed via fs_flags. If
-fiemap_check_flags finds invalid user flags, it will place the bad values in
+fiemap_prep finds invalid user flags, it will place the bad values in
 fieinfo->fi_flags and return -EBADR. If the file system gets -EBADR, from
-fiemap_check_flags(), it should immediately exit, returning that error back to
-ioctl_fiemap().
+fiemap_prep(), it should immediately exit, returning that error back to
+ioctl_fiemap().  Additionally the range is validate against the supported
+maximum file size.
 
 
 For each extent in the request range, the file system should call

fs/bad_inode.c

@@ -15,6 +15,7 @@
 #include <linux/time.h>
 #include <linux/namei.h>
 #include <linux/poll.h>
+#include <linux/fiemap.h>
 
 static int bad_file_open(struct inode *inode, struct file *filp)
 {

fs/btrfs/extent_io.h

@@ -5,6 +5,7 @@
 
 #include <linux/rbtree.h>
 #include <linux/refcount.h>
+#include <linux/fiemap.h>
 #include "ulist.h"
 
 /*

fs/btrfs/inode.c

@@ -7828,14 +7828,12 @@ const struct iomap_dio_ops btrfs_dops = {
 	.submit_io		= btrfs_submit_direct,
 };
 
-#define BTRFS_FIEMAP_FLAGS	(FIEMAP_FLAG_SYNC)
-
 static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 		__u64 start, __u64 len)
 {
 	int	ret;
 
-	ret = fiemap_check_flags(fieinfo, BTRFS_FIEMAP_FLAGS);
+	ret = fiemap_prep(inode, fieinfo, start, &len, 0);
 	if (ret)
 		return ret;
 

fs/cifs/inode.c

@@ -25,6 +25,7 @@
 #include <linux/freezer.h>
 #include <linux/sched/signal.h>
 #include <linux/wait_bit.h>
+#include <linux/fiemap.h>
 
 #include <asm/div64.h>
 #include "cifsfs.h"

fs/cifs/smb2ops.c

@@ -12,6 +12,7 @@
 #include <linux/uuid.h>
 #include <linux/sort.h>
 #include <crypto/aead.h>
+#include <linux/fiemap.h>
 #include "cifsfs.h"
 #include "cifsglob.h"
 #include "smb2pdu.h"
@@ -3407,8 +3408,9 @@ static int smb3_fiemap(struct cifs_tcon *tcon,
 	int i, num, rc, flags, last_blob;
 	u64 next;
 
-	if (fiemap_check_flags(fei, FIEMAP_FLAG_SYNC))
-		return -EBADR;
+	rc = fiemap_prep(d_inode(cfile->dentry), fei, start, &len, 0);
+	if (rc)
+		return rc;
 
 	xid = get_xid();
  again:

fs/ext2/inode.c

@@ -36,6 +36,7 @@
 #include <linux/iomap.h>
 #include <linux/namei.h>
 #include <linux/uio.h>
+#include <linux/fiemap.h>
 #include "ext2.h"
 #include "acl.h"
 #include "xattr.h"

fs/ext4/Kconfig

@@ -99,8 +99,7 @@ config EXT4_DEBUG
 	  Enables run-time debugging support for the ext4 filesystem.
 
 	  If you select Y here, then you will be able to turn on debugging
-	  with a command such as:
-		echo 1 > /sys/module/ext4/parameters/mballoc_debug
+	  using dynamic debug control for mb_debug() / ext_debug() msgs.
 
 config EXT4_KUNIT_TESTS
 	tristate "KUnit tests for ext4"

fs/ext4/acl.c

@@ -215,9 +215,8 @@ __ext4_set_acl(handle_t *handle, struct inode *inode, int type,
 				      value, size, xattr_flags);
 
 	kfree(value);
-	if (!error) {
+	if (!error)
 		set_cached_acl(inode, type, acl);
-	}
 
 	return error;
 }
@@ -256,7 +255,7 @@ ext4_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 	if (!error && update_mode) {
 		inode->i_mode = mode;
 		inode->i_ctime = current_time(inode);
-		ext4_mark_inode_dirty(handle, inode);
+		error = ext4_mark_inode_dirty(handle, inode);
 	}
 out_stop:
 	ext4_journal_stop(handle);

fs/ext4/balloc.c

@@ -903,10 +903,11 @@ ext4_fsblk_t ext4_inode_to_goal_block(struct inode *inode)
 		return bg_start;
 
 	if (bg_start + EXT4_BLOCKS_PER_GROUP(inode->i_sb) <= last_block)
-		colour = (current->pid % 16) *
+		colour = (task_pid_nr(current) % 16) *
 			(EXT4_BLOCKS_PER_GROUP(inode->i_sb) / 16);
 	else
-		colour = (current->pid % 16) * ((last_block - bg_start) / 16);
+		colour = (task_pid_nr(current) % 16) *
+			((last_block - bg_start) / 16);
 	return bg_start + colour;
 }