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[PATCH] ext3: add extent map support

Browse source 
On disk extents format:
/*
* this is extent on-disk structure
* it's used at the bottom of the tree
*/
struct ext3_extent {
__le32  ee_block;       /* first logical block extent covers */
__le16  ee_len;         /* number of blocks covered by extent */
__le16  ee_start_hi;    /* high 16 bits of physical block */
__le32  ee_start;       /* low 32 bigs of physical block */
};

Signed-off-by: Alex Tomas <[email protected]>
Signed-off-by: Dave Kleikamp <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Alex Tomas 2006-10-11 01:21:03 -07:00 • committed by Linus Torvalds
commit a86c618126
12 changed files with 2368 additions and 18 deletions
Download patch file Download diff file Expand all files Collapse all files

2
fs/ext4/Makefile
View file

@ -5,7 +5,7 @@
obj-$(CONFIG_EXT4DEV_FS) += ext4dev.o
ext4dev-y := balloc.o bitmap.o dir.o file.o fsync.o ialloc.o inode.o \
ioctl.o namei.o super.o symlink.o hash.o resize.o
ioctl.o namei.o super.o symlink.o hash.o resize.o extents.o
ext4dev-$(CONFIG_EXT4DEV_FS_XATTR) += xattr.o xattr_user.o xattr_trusted.o
ext4dev-$(CONFIG_EXT4DEV_FS_POSIX_ACL) += acl.o

3
fs/ext4/dir.c
View file

@ -134,8 +134,7 @@ static int ext4_readdir(struct file * filp,
struct buffer_head *bh = NULL;
map_bh.b_state = 0;
err = ext4_get_blocks_handle(NULL, inode, blk, 1,
&map_bh, 0, 0);
err = ext4_get_blocks_wrap(NULL, inode, blk, 1, &map_bh, 0, 0);
if (err > 0) {
page_cache_readahead(sb->s_bdev->bd_inode->i_mapping,
&filp->f_ra,

2075
fs/ext4/extents.c Normal file
View file

File diff suppressed because it is too large Load diff

11
fs/ext4/ialloc.c
View file

@ -615,6 +615,17 @@ got:
ext4_std_error(sb, err);
goto fail_free_drop;
}
if (test_opt(sb, EXTENTS)) {
EXT4_I(inode)->i_flags |= EXT4_EXTENTS_FL;
ext4_ext_tree_init(handle, inode);
if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh);
if (err) goto fail;
EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS);
BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "call ext4_journal_dirty_metadata");
err = ext4_journal_dirty_metadata(handle, EXT4_SB(sb)->s_sbh);
}
}
ext4_debug("allocating inode %lu\n", inode->i_ino);
goto really_out;

17
fs/ext4/inode.c
View file

@ -40,8 +40,6 @@
#include "xattr.h"
#include "acl.h"
static int ext4_writepage_trans_blocks(struct inode *inode);
/*
* Test whether an inode is a fast symlink.
*/
@ -804,6 +802,7 @@ int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
ext4_fsblk_t first_block = 0;
J_ASSERT(!(EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL));
J_ASSERT(handle != NULL || create == 0);
depth = ext4_block_to_path(inode,iblock,offsets,&blocks_to_boundary);
@ -984,7 +983,7 @@ static int ext4_get_block(struct inode *inode, sector_t iblock,
get_block:
if (ret == 0) {
ret = ext4_get_blocks_handle(handle, inode, iblock,
ret = ext4_get_blocks_wrap(handle, inode, iblock,
max_blocks, bh_result, create, 0);
if (ret > 0) {
bh_result->b_size = (ret << inode->i_blkbits);
@ -1008,7 +1007,7 @@ struct buffer_head *ext4_getblk(handle_t *handle, struct inode *inode,
dummy.b_state = 0;
dummy.b_blocknr = -1000;
buffer_trace_init(&dummy.b_history);
err = ext4_get_blocks_handle(handle, inode, block, 1,
err = ext4_get_blocks_wrap(handle, inode, block, 1,
&dummy, create, 1);
/*
* ext4_get_blocks_handle() returns number of blocks
@ -1759,7 +1758,7 @@ void ext4_set_aops(struct inode *inode)
* This required during truncate. We need to physically zero the tail end
* of that block so it doesn't yield old data if the file is later grown.
*/
static int ext4_block_truncate_page(handle_t *handle, struct page *page,
int ext4_block_truncate_page(handle_t *handle, struct page *page,
struct address_space *mapping, loff_t from)
{
ext4_fsblk_t index = from >> PAGE_CACHE_SHIFT;
@ -2263,6 +2262,9 @@ void ext4_truncate(struct inode *inode)
return;
}
if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)
return ext4_ext_truncate(inode, page);
handle = start_transaction(inode);
if (IS_ERR(handle)) {
if (page) {
@ -3003,12 +3005,15 @@ err_out:
* block and work out the exact number of indirects which are touched. Pah.
*/
static int ext4_writepage_trans_blocks(struct inode *inode)
int ext4_writepage_trans_blocks(struct inode *inode)
{
int bpp = ext4_journal_blocks_per_page(inode);
int indirects = (EXT4_NDIR_BLOCKS % bpp) ? 5 : 3;
int ret;
if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)
return ext4_ext_writepage_trans_blocks(inode, bpp);
if (ext4_should_journal_data(inode))
ret = 3 * (bpp + indirects) + 2;
else

1
fs/ext4/ioctl.c
View file

@ -248,7 +248,6 @@ flags_err:
return err;
}
default:
return -ENOTTY;
}

10
fs/ext4/super.c
View file

@ -390,6 +390,7 @@ static void ext4_put_super (struct super_block * sb)
struct ext4_super_block *es = sbi->s_es;
int i;
ext4_ext_release(sb);
ext4_xattr_put_super(sb);
jbd2_journal_destroy(sbi->s_journal);
if (!(sb->s_flags & MS_RDONLY)) {
@ -454,6 +455,7 @@ static struct inode *ext4_alloc_inode(struct super_block *sb)
#endif
ei->i_block_alloc_info = NULL;
ei->vfs_inode.i_version = 1;
memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
return &ei->vfs_inode;
}
@ -677,7 +679,7 @@ enum {
Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
Opt_grpquota
Opt_grpquota, Opt_extents,
};
static match_table_t tokens = {
@ -727,6 +729,7 @@ static match_table_t tokens = {
{Opt_quota, "quota"},
{Opt_usrquota, "usrquota"},
{Opt_barrier, "barrier=%u"},
{Opt_extents, "extents"},
{Opt_err, NULL},
{Opt_resize, "resize"},
};
@ -1059,6 +1062,9 @@ clear_qf_name:
case Opt_bh:
clear_opt(sbi->s_mount_opt, NOBH);
break;
case Opt_extents:
set_opt (sbi->s_mount_opt, EXTENTS);
break;
default:
printk (KERN_ERR
"EXT4-fs: Unrecognized mount option \"%s\" "
@ -1787,6 +1793,8 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
"writeback");
ext4_ext_init(sb);
lock_kernel();
return 0;