Commit a86c6181 authored by Alex Tomas's avatar Alex Tomas Committed by Linus Torvalds
Browse files

[PATCH] ext3: add extent map support 



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: default avatarAlex Tomas <alex@clusterfs.com>
Signed-off-by: default avatarDave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent c3fcc813

fs/ext4/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -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

fs/ext4/dir.c

+1 −2
Original line number Diff line number Diff line
@@ -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,

fs/ext4/extents.c

0 → 100644
+2075 −0

File added.

Preview size limit exceeded, changes collapsed.

fs/ext4/ialloc.c

+11 −0
Original line number Diff line number Diff line
@@ -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;

fs/ext4/inode.c

+11 −6
Original line number Diff line number Diff line
@@ -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

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