ext4: Remove (partial, never completed) fragment support

Fragment support in ext2/3/4 was never implemented, and it probably will
never be implemented.   So remove it from ext4.

Signed-off-by: Coly Li <coyli@suse.de>
Acked-by: Andreas Dilger <adilger@clusterfs.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

6 files changed, 6 insertions, 67 deletions

diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index d0c7793d9393..38e9a0a705df 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -573,11 +573,6 @@ 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 0df2b1e06d0b..1685f6a87789 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2711,11 +2711,6 @@ 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))
@@ -2860,11 +2855,6 @@ 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 83f9cd358e5a..e2bdf93693a6 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1726,14 +1726,6 @@ 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 ||
@@ -1747,7 +1739,6 @@ 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;
@@ -1771,12 +1762,6 @@ 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 cdee7aaa57aa..3baeb996fd3f 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 1a511e9905aa..86ddfe2089f3 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 0a8e47d47c91..b40e827cd495 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 */