Merge tag 'f2fs-for-5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs

Pull f2fs updates from Jaegeuk Kim:
 "We've continued mainly to fix bugs in this round, as f2fs has been
  shipped in more devices. Especially, we've focused on stabilizing
  checkpoint=disable feature, and provided some interfaces for QA.

  Enhancements:
   - expose FS_NOCOW_FL for pin_file
   - run discard jobs at unmount time with timeout
   - tune discarding thread to avoid idling which consumes power
   - some checking codes to address vulnerabilities
   - give random value to i_generation
   - shutdown with more flags for QA

  Bug fixes:
   - clean up stale objects when mount is failed along with
     checkpoint=disable
   - fix system being stuck due to wrong count by atomic writes
   - handle some corrupted disk cases
   - fix a deadlock in f2fs_read_inline_dir

  We've also added some minor build error fixes and clean-up patches"

* tag 'f2fs-for-5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs: (53 commits)
  f2fs: set pin_file under CAP_SYS_ADMIN
  f2fs: fix to avoid deadlock in f2fs_read_inline_dir()
  f2fs: fix to adapt small inline xattr space in __find_inline_xattr()
  f2fs: fix to do sanity check with inode.i_inline_xattr_size
  f2fs: give some messages for inline_xattr_size
  f2fs: don't trigger read IO for beyond EOF page
  f2fs: fix to add refcount once page is tagged PG_private
  f2fs: remove wrong comment in f2fs_invalidate_page()
  f2fs: fix to use kvfree instead of kzfree
  f2fs: print more parameters in trace_f2fs_map_blocks
  f2fs: trace f2fs_ioc_shutdown
  f2fs: fix to avoid deadlock of atomic file operations
  f2fs: fix to dirty inode for i_mode recovery
  f2fs: give random value to i_generation
  f2fs: no need to take page lock in readdir
  f2fs: fix to update iostat correctly in IPU path
  f2fs: fix encrypted page memory leak
  f2fs: make fault injection covering __submit_flush_wait()
  f2fs: fix to retry fill_super only if recovery failed
  f2fs: silence VM_WARN_ON_ONCE in mempool_alloc
  ...

include/linux/f2fs_fs.h

@@ -116,6 +116,7 @@ struct f2fs_super_block {
 /*
  * For checkpoint
  */
+#define CP_DISABLED_QUICK_FLAG		0x00002000
 #define CP_DISABLED_FLAG		0x00001000
 #define CP_QUOTA_NEED_FSCK_FLAG		0x00000800
 #define CP_LARGE_NAT_BITMAP_FLAG	0x00000400
@@ -186,7 +187,7 @@ struct f2fs_orphan_block {
 struct f2fs_extent {
 	__le32 fofs;		/* start file offset of the extent */
 	__le32 blk;		/* start block address of the extent */
-	__le32 len;		/* lengh of the extent */
+	__le32 len;		/* length of the extent */
 } __packed;
 
 #define F2FS_NAME_LEN		255
@@ -284,7 +285,7 @@ enum {
 
 struct node_footer {
 	__le32 nid;		/* node id */
-	__le32 ino;		/* inode nunmber */
+	__le32 ino;		/* inode number */
 	__le32 flag;		/* include cold/fsync/dentry marks and offset */
 	__le64 cp_ver;		/* checkpoint version */
 	__le32 next_blkaddr;	/* next node page block address */
@@ -489,12 +490,12 @@ typedef __le32	f2fs_hash_t;
 
 /*
  * space utilization of regular dentry and inline dentry (w/o extra reservation)
- *		regular dentry			inline dentry
- * bitmap	1 * 27 = 27			1 * 23 = 23
- * reserved	1 * 3 = 3			1 * 7 = 7
- * dentry	11 * 214 = 2354			11 * 182 = 2002
- * filename	8 * 214 = 1712			8 * 182 = 1456
- * total	4096				3488
+ *		regular dentry		inline dentry (def)	inline dentry (min)
+ * bitmap	1 * 27 = 27		1 * 23 = 23		1 * 1 = 1
+ * reserved	1 * 3 = 3		1 * 7 = 7		1 * 1 = 1
+ * dentry	11 * 214 = 2354		11 * 182 = 2002		11 * 2 = 22
+ * filename	8 * 214 = 1712		8 * 182 = 1456		8 * 2 = 16
+ * total	4096			3488			40
  *
  * Note: there are more reserved space in inline dentry than in regular
  * dentry, when converting inline dentry we should handle this carefully.
@@ -506,12 +507,13 @@ typedef __le32	f2fs_hash_t;
 #define SIZE_OF_RESERVED	(PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \
 				F2FS_SLOT_LEN) * \
 				NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP))
+#define MIN_INLINE_DENTRY_SIZE		40	/* just include '.' and '..' entries */
 
 /* One directory entry slot representing F2FS_SLOT_LEN-sized file name */
 struct f2fs_dir_entry {
 	__le32 hash_code;	/* hash code of file name */
 	__le32 ino;		/* inode number */
-	__le16 name_len;	/* lengh of file name */
+	__le16 name_len;	/* length of file name */
 	__u8 file_type;		/* file type */
 } __packed;