NTFS: 2.0.14 - Run list merging code cleanup, minor locking changes, typo fixes.

- Change fs/ntfs/super.c::ntfs_statfs() to not rely on BKL by moving
  the locking out of super.c::get_nr_free_mft_records() and taking and
  dropping the mftbmp_lock rw_semaphore in ntfs_statfs() itself.
- Bring attribute run list merging code (fs/ntfs/attrib.c) in sync with
  current userspace ntfs library code. This means that if a merge
  fails the original run lists are always left unmodified instead of
  being silently corrupted.
- Misc typo fixes.

Documentation/filesystems/ntfs.txt

@@ -247,6 +247,9 @@ ChangeLog
 
 Note, a technical ChangeLog aimed at kernel hackers is in fs/ntfs/ChangeLog.
 
+2.0.14:
+	- Internal changes improving run list merging code and minor locking
+	  change to not rely on BKL in ntfs_statfs().
 2.0.13:
 	- Internal changes towards using iget5_locked() in preparation for
 	  fake inodes and small cleanups to ntfs_volume structure.

fs/ntfs/ChangeLog

@@ -28,6 +28,17 @@ ToDo:
 	- Enable NFS exporting of NTFS.
 	- Use fake inodes for address space i/o.
 
+2.0.14 - Run list merging code cleanup, minor locking changes, typo fixes.
+
+	- Change fs/ntfs/super.c::ntfs_statfs() to not rely on BKL by moving
+	  the locking out of super.c::get_nr_free_mft_records() and taking and
+	  dropping the mftbmp_lock rw_semaphore in ntfs_statfs() itself.
+	- Bring attribute run list merging code (fs/ntfs/attrib.c) in sync with
+	  current userspace ntfs library code. This means that if a merge
+	  fails the original run lists are always left unmodified instead of
+	  being silently corrupted.
+	- Misc typo fixes.
+
 2.0.13 - Use iget5_locked() in preparation for fake inodes and small cleanups.
 
 	- Remove nr_mft_bits and the now superfluous union with nr_mft_records

fs/ntfs/Makefile

@@ -5,7 +5,7 @@ obj-$(CONFIG_NTFS_FS) += ntfs.o
 ntfs-objs := aops.o attrib.o compress.o debug.o dir.o file.o inode.o mft.o \
 	     mst.o namei.o super.o sysctl.o time.o unistr.o upcase.o
 
-EXTRA_CFLAGS = -DNTFS_VERSION=\"2.0.13\"
+EXTRA_CFLAGS = -DNTFS_VERSION=\"2.0.14\"
 
 ifeq ($(CONFIG_NTFS_DEBUG),y)
 EXTRA_CFLAGS += -DDEBUG

fs/ntfs/mst.c

@@ -48,7 +48,7 @@ int post_read_mst_fixup(NTFS_RECORD *b, const u32 size)
 	usa_ofs = le16_to_cpu(b->usa_ofs);
 	/* Decrement usa_count to get number of fixups. */
 	usa_count = le16_to_cpu(b->usa_count) - 1;
-	/* Size and alignement checks. */
+	/* Size and alignment checks. */
 	if ( size & (NTFS_BLOCK_SIZE - 1)	||
 	     usa_ofs & 1			||
 	     usa_ofs + (usa_count * 2) > size	||
@@ -132,7 +132,7 @@ int pre_write_mst_fixup(NTFS_RECORD *b, const u32 size)
 	usa_ofs = le16_to_cpu(b->usa_ofs);
 	/* Decrement usa_count to get number of fixups. */
 	usa_count = le16_to_cpu(b->usa_count) - 1;
-	/* Size and alignement checks. */
+	/* Size and alignment checks. */
 	if ( size & (NTFS_BLOCK_SIZE - 1)	||
 	     usa_ofs & 1			||
 	     usa_ofs + (usa_count * 2) > size	||

fs/ntfs/super.c

@@ -1077,7 +1077,7 @@ static BOOL load_system_files(ntfs_volume *vol)
  * releases all inodes and memory belonging to the NTFS specific part of the
  * super block.
  */
-void ntfs_put_super(struct super_block *vfs_sb)
+static void ntfs_put_super(struct super_block *vfs_sb)
 {
 	ntfs_volume *vol = NTFS_SB(vfs_sb);
 
@@ -1155,7 +1155,7 @@ void ntfs_put_super(struct super_block *vfs_sb)
  * Errors are ignored and we just return the number of free clusters we have
  * found. This means we return an underestimate on error.
  */
-s64 get_nr_free_clusters(ntfs_volume *vol)
+static s64 get_nr_free_clusters(ntfs_volume *vol)
 {
 	struct address_space *mapping = vol->lcnbmp_ino->i_mapping;
 	filler_t *readpage = (filler_t*)mapping->a_ops->readpage;
@@ -1227,7 +1227,7 @@ s64 get_nr_free_clusters(ntfs_volume *vol)
 }
 
 /**
- * get_nr_free_mft_records - return the number of free inodes on a volume
+ * __get_nr_free_mft_records - return the number of free inodes on a volume
  * @vol:	ntfs volume for which to obtain free inode count
  *
  * Calculate the number of free mft records (inodes) on the mounted NTFS
@@ -1235,8 +1235,10 @@ s64 get_nr_free_clusters(ntfs_volume *vol)
  *
  * Errors are ignored and we just return the number of free inodes we have
  * found. This means we return an underestimate on error.
+ *
+ * NOTE: Caller must hold mftbmp_lock rw_semaphore for reading or writing.
  */
-unsigned long get_nr_free_mft_records(ntfs_volume *vol)
+static unsigned long __get_nr_free_mft_records(ntfs_volume *vol)
 {
 	struct address_space *mapping;
 	filler_t *readpage;
@@ -1247,7 +1249,6 @@ unsigned long get_nr_free_mft_records(ntfs_volume *vol)
 
 	ntfs_debug("Entering.");
 	/* Serialize accesses to the inode bitmap. */
-	down_read(&vol->mftbmp_lock);
 	mapping = &vol->mftbmp_mapping;
 	readpage = (filler_t*)mapping->a_ops->readpage;
 	/*
@@ -1307,7 +1308,6 @@ unsigned long get_nr_free_mft_records(ntfs_volume *vol)
 	}
 	ntfs_debug("Finished reading $MFT/$BITMAP, last index = 0x%lx",
 			index - 1);
-	up_read(&vol->mftbmp_lock);
 	ntfs_debug("Exiting.");
 	return nr_free;
 }
@@ -1330,7 +1330,7 @@ unsigned long get_nr_free_mft_records(ntfs_volume *vol)
  *
  * Return 0 on success or -errno on error.
  */
-int ntfs_statfs(struct super_block *sb, struct statfs *sfs)
+static int ntfs_statfs(struct super_block *sb, struct statfs *sfs)
 {
 	ntfs_volume *vol = NTFS_SB(sb);
 	s64 size;
@@ -1354,10 +1354,12 @@ int ntfs_statfs(struct super_block *sb, struct statfs *sfs)
 		size = 0LL;
 	/* Free blocks avail to non-superuser, same as above on NTFS. */
 	sfs->f_bavail = sfs->f_bfree = size;
+	down_read(&vol->mftbmp_lock);
 	/* Total file nodes in file system (at this moment in time). */
 	sfs->f_files  = vol->mft_ino->i_size >> vol->mft_record_size_bits;
 	/* Free file nodes in fs (based on current total count). */
-	sfs->f_ffree = get_nr_free_mft_records(vol);
+	sfs->f_ffree = __get_nr_free_mft_records(vol);
+	up_read(&vol->mftbmp_lock);
 	/*
 	 * File system id. This is extremely *nix flavour dependent and even
 	 * within Linux itself all fs do their own thing. I interpret this to