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Date:	Thu,  4 Oct 2007 01:50:42 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	linux-kernel@...r.kernel.org
Cc:	linux-ext4@...r.kernel.org, Coly Li <coyli@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] Once ext4 will not implement fragment, it is believed it will never be

From: Coly Li <coyli@...e.de>

implement in future.  Therefore fragment related source code in ext4 should
be obsoleted -- no one will use it.

This patch obsolete fragment from ext4.  Another patch posted on linux-ext4
removing fragment supporting from e2fsprogs.

Signed-off-by: Coly Li <coyli@...e.de>
Acked-by: Andreas Dilger <adilger@...sterfs.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---
 fs/ext4/ialloc.c           |    5 -----
 fs/ext4/inode.c            |   10 ----------
 fs/ext4/super.c            |   15 ---------------
 include/linux/ext4_fs.h    |   35 ++++++-----------------------------
 include/linux/ext4_fs_i.h  |    5 -----
 include/linux/ext4_fs_sb.h |    3 ---
 6 files changed, 6 insertions(+), 67 deletions(-)

diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 427f830..b8b538d 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -576,11 +576,6 @@ got:
 	/* dirsync only applies to directories */
 	if (!S_ISDIR(mode))
 		ei->i_flags &= ~EXT4_DIRSYNC_FL;
-#ifdef EXT4_FRAGMENTS
-	ei->i_faddr = 0;
-	ei->i_frag_no = 0;
-	ei->i_frag_size = 0;
-#endif
 	ei->i_file_acl = 0;
 	ei->i_dir_acl = 0;
 	ei->i_dtime = 0;
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index a4848e0..f283522 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2645,11 +2645,6 @@ void ext4_read_inode(struct inode * inode)
 	}
 	inode->i_blocks = le32_to_cpu(raw_inode->i_blocks);
 	ei->i_flags = le32_to_cpu(raw_inode->i_flags);
-#ifdef EXT4_FRAGMENTS
-	ei->i_faddr = le32_to_cpu(raw_inode->i_faddr);
-	ei->i_frag_no = raw_inode->i_frag;
-	ei->i_frag_size = raw_inode->i_fsize;
-#endif
 	ei->i_file_acl = le32_to_cpu(raw_inode->i_file_acl);
 	if (EXT4_SB(inode->i_sb)->s_es->s_creator_os !=
 	    cpu_to_le32(EXT4_OS_HURD))
@@ -2794,11 +2789,6 @@ static int ext4_do_update_inode(handle_t *handle,
 	raw_inode->i_blocks = cpu_to_le32(inode->i_blocks);
 	raw_inode->i_dtime = cpu_to_le32(ei->i_dtime);
 	raw_inode->i_flags = cpu_to_le32(ei->i_flags);
-#ifdef EXT4_FRAGMENTS
-	raw_inode->i_faddr = cpu_to_le32(ei->i_faddr);
-	raw_inode->i_frag = ei->i_frag_no;
-	raw_inode->i_fsize = ei->i_frag_size;
-#endif
 	if (EXT4_SB(inode->i_sb)->s_es->s_creator_os !=
 	    cpu_to_le32(EXT4_OS_HURD))
 		raw_inode->i_file_acl_high =
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 42cbdb5..420d39d 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1655,14 +1655,6 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
 		if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
 			sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
 	}
-	sbi->s_frag_size = EXT4_MIN_FRAG_SIZE <<
-				   le32_to_cpu(es->s_log_frag_size);
-	if (blocksize != sbi->s_frag_size) {
-		printk(KERN_ERR
-		       "EXT4-fs: fragsize %lu != blocksize %u (unsupported)\n",
-		       sbi->s_frag_size, blocksize);
-		goto failed_mount;
-	}
 	sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
 	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
 		if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
@@ -1676,7 +1668,6 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
 	} else
 		sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
 	sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
-	sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
 	sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
 	if (EXT4_INODE_SIZE(sb) == 0)
 		goto cantfind_ext4;
@@ -1700,12 +1691,6 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
 			sbi->s_blocks_per_group);
 		goto failed_mount;
 	}
-	if (sbi->s_frags_per_group > blocksize * 8) {
-		printk (KERN_ERR
-			"EXT4-fs: #fragments per group too big: %lu\n",
-			sbi->s_frags_per_group);
-		goto failed_mount;
-	}
 	if (sbi->s_inodes_per_group > blocksize * 8) {
 		printk (KERN_ERR
 			"EXT4-fs: #inodes per group too big: %lu\n",
diff --git a/include/linux/ext4_fs.h b/include/linux/ext4_fs.h
index cdee7aa..3baeb99 100644
--- a/include/linux/ext4_fs.h
+++ b/include/linux/ext4_fs.h
@@ -105,20 +105,6 @@
 #define EXT4_BLOCK_ALIGN(size, blkbits)		ALIGN((size), (1 << (blkbits)))
 
 /*
- * Macro-instructions used to manage fragments
- */
-#define EXT4_MIN_FRAG_SIZE		1024
-#define	EXT4_MAX_FRAG_SIZE		4096
-#define EXT4_MIN_FRAG_LOG_SIZE		  10
-#ifdef __KERNEL__
-# define EXT4_FRAG_SIZE(s)		(EXT4_SB(s)->s_frag_size)
-# define EXT4_FRAGS_PER_BLOCK(s)	(EXT4_SB(s)->s_frags_per_block)
-#else
-# define EXT4_FRAG_SIZE(s)		(EXT4_MIN_FRAG_SIZE << (s)->s_log_frag_size)
-# define EXT4_FRAGS_PER_BLOCK(s)	(EXT4_BLOCK_SIZE(s) / EXT4_FRAG_SIZE(s))
-#endif
-
-/*
  * Structure of a blocks group descriptor
  */
 struct ext4_group_desc
@@ -311,27 +297,24 @@ struct ext4_inode {
 	__le32	i_generation;	/* File version (for NFS) */
 	__le32	i_file_acl;	/* File ACL */
 	__le32	i_dir_acl;	/* Directory ACL */
-	__le32	i_faddr;	/* Fragment address */
+	__le32	i_obso_faddr;	/* Obsoleted fragment address */
 	union {
 		struct {
-			__u8	l_i_frag;	/* Fragment number */
-			__u8	l_i_fsize;	/* Fragment size */
+			__le16	l_i_reserved1;	/* Obsoleted fragment number/size which are removed in ext4 */
 			__le16	l_i_file_acl_high;
 			__le16	l_i_uid_high;	/* these 2 fields */
 			__le16	l_i_gid_high;	/* were reserved2[0] */
 			__u32	l_i_reserved2;
 		} linux2;
 		struct {
-			__u8	h_i_frag;	/* Fragment number */
-			__u8	h_i_fsize;	/* Fragment size */
+			__le16	h_i_reserved1;	/* Obsoleted fragment number/size which are removed in ext4 */
 			__u16	h_i_mode_high;
 			__u16	h_i_uid_high;
 			__u16	h_i_gid_high;
 			__u32	h_i_author;
 		} hurd2;
 		struct {
-			__u8	m_i_frag;	/* Fragment number */
-			__u8	m_i_fsize;	/* Fragment size */
+			__le16	h_i_reserved1;	/* Obsoleted fragment number/size which are removed in ext4 */
 			__le16	m_i_file_acl_high;
 			__u32	m_i_reserved2[2];
 		} masix2;
@@ -419,8 +402,6 @@ do {									       \
 
 #if defined(__KERNEL__) || defined(__linux__)
 #define i_reserved1	osd1.linux1.l_i_reserved1
-#define i_frag		osd2.linux2.l_i_frag
-#define i_fsize		osd2.linux2.l_i_fsize
 #define i_file_acl_high	osd2.linux2.l_i_file_acl_high
 #define i_uid_low	i_uid
 #define i_gid_low	i_gid
@@ -431,8 +412,6 @@ do {									       \
 #elif defined(__GNU__)
 
 #define i_translator	osd1.hurd1.h_i_translator
-#define i_frag		osd2.hurd2.h_i_frag;
-#define i_fsize		osd2.hurd2.h_i_fsize;
 #define i_uid_high	osd2.hurd2.h_i_uid_high
 #define i_gid_high	osd2.hurd2.h_i_gid_high
 #define i_author	osd2.hurd2.h_i_author
@@ -440,8 +419,6 @@ do {									       \
 #elif defined(__masix__)
 
 #define i_reserved1	osd1.masix1.m_i_reserved1
-#define i_frag		osd2.masix2.m_i_frag
-#define i_fsize		osd2.masix2.m_i_fsize
 #define i_file_acl_high	osd2.masix2.m_i_file_acl_high
 #define i_reserved2	osd2.masix2.m_i_reserved2
 
@@ -528,9 +505,9 @@ struct ext4_super_block {
 /*10*/	__le32	s_free_inodes_count;	/* Free inodes count */
 	__le32	s_first_data_block;	/* First Data Block */
 	__le32	s_log_block_size;	/* Block size */
-	__le32	s_log_frag_size;	/* Fragment size */
+	__le32	s_obso_log_frag_size;	/* Obsoleted fragment size */
 /*20*/	__le32	s_blocks_per_group;	/* # Blocks per group */
-	__le32	s_frags_per_group;	/* # Fragments per group */
+	__le32	s_obso_frags_per_group;	/* Obsoleted fragments per group */
 	__le32	s_inodes_per_group;	/* # Inodes per group */
 	__le32	s_mtime;		/* Mount time */
 /*30*/	__le32	s_wtime;		/* Write time */
diff --git a/include/linux/ext4_fs_i.h b/include/linux/ext4_fs_i.h
index 1a511e9..86ddfe2 100644
--- a/include/linux/ext4_fs_i.h
+++ b/include/linux/ext4_fs_i.h
@@ -78,11 +78,6 @@ struct ext4_ext_cache {
 struct ext4_inode_info {
 	__le32	i_data[15];	/* unconverted */
 	__u32	i_flags;
-#ifdef EXT4_FRAGMENTS
-	__u32	i_faddr;
-	__u8	i_frag_no;
-	__u8	i_frag_size;
-#endif
 	ext4_fsblk_t	i_file_acl;
 	__u32	i_dir_acl;
 	__u32	i_dtime;
diff --git a/include/linux/ext4_fs_sb.h b/include/linux/ext4_fs_sb.h
index 1b2ffee..a978fba 100644
--- a/include/linux/ext4_fs_sb.h
+++ b/include/linux/ext4_fs_sb.h
@@ -28,11 +28,8 @@
  * third extended-fs super-block data in memory
  */
 struct ext4_sb_info {
-	unsigned long s_frag_size;	/* Size of a fragment in bytes */
 	unsigned long s_desc_size;	/* Size of a group descriptor in bytes */
-	unsigned long s_frags_per_block;/* Number of fragments per block */
 	unsigned long s_inodes_per_block;/* Number of inodes per block */
-	unsigned long s_frags_per_group;/* Number of fragments in a group */
 	unsigned long s_blocks_per_group;/* Number of blocks in a group */
 	unsigned long s_inodes_per_group;/* Number of inodes in a group */
 	unsigned long s_itb_per_group;	/* Number of inode table blocks per group */
-- 
1.5.3.2.81.g17ed

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