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ext4: Introduce ext4_lblk_t

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This patch adds a new data type ext4_lblk_t to represent
the logical file blocks.

This is the preparatory patch to support large files in ext4
The follow up patch with convert the ext4_inode i_blocks to
represent the number of blocks in file system block size. This
changes makes it possible to have a block number 2**32 -1 which
will result in overflow if the block number is represented by
signed long. This patch convert all the block number to type
ext4_lblk_t which is typedef to __u32

Also remove dead code ext4_ext_walk_space

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
This commit is contained in:
Aneesh Kumar K.V
2008-01-28 23:58:27 -05:00
committed by Theodore Ts'o
parent a72d7f834e
commit 725d26d3f0
8 changed files with 143 additions and 226 deletions
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9
include/linux/ext4_fs_i.h
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@@ -27,6 +27,9 @@ typedef int ext4_grpblk_t;
/* data type for filesystem-wide blocks number */
typedef unsigned long long ext4_fsblk_t;
/* data type for file logical block number */
typedef __u32 ext4_lblk_t;
struct ext4_reserve_window {
ext4_fsblk_t _rsv_start; /* First byte reserved */
ext4_fsblk_t _rsv_end; /* Last byte reserved or 0 */
@@ -48,7 +51,7 @@ struct ext4_block_alloc_info {
* most-recently-allocated block in this file.
* We use this for detecting linearly ascending allocation requests.
*/
__u32 last_alloc_logical_block;
ext4_lblk_t last_alloc_logical_block;
/*
* Was i_next_alloc_goal in ext4_inode_info
* is the *physical* companion to i_next_alloc_block.
@@ -67,7 +70,7 @@ struct ext4_block_alloc_info {
*/
struct ext4_ext_cache {
ext4_fsblk_t ec_start;
__u32 ec_block;
ext4_lblk_t ec_block;
__u32 ec_len; /* must be 32bit to return holes */
__u32 ec_type;
};
@@ -95,7 +98,7 @@ struct ext4_inode_info {
/* block reservation info */
struct ext4_block_alloc_info *i_block_alloc_info;
__u32 i_dir_start_lookup;
ext4_lblk_t i_dir_start_lookup;
#ifdef CONFIG_EXT4DEV_FS_XATTR
/*
* Extended attributes can be read independently of the main file