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ext4: Introduce ext4_lblk_t

瀏覽代碼 
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
父節點 a72d7f834e
當前提交 725d26d3f0
共有 8 個文件被更改，包括 143 次插入 和 226 次删除
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218
fs/ext4/extents.c
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@@ -144,7 +144,7 @@ static int ext4_ext_dirty(handle_t *handle, struct inode *inode,
static ext4_fsblk_t ext4_ext_find_goal(struct inode *inode,
struct ext4_ext_path *path,
ext4_fsblk_t block)
ext4_lblk_t block)
{
struct ext4_inode_info *ei = EXT4_I(inode);
ext4_fsblk_t bg_start;
@@ -367,13 +367,14 @@ static void ext4_ext_drop_refs(struct ext4_ext_path *path)
* the header must be checked before calling this
*/
static void
ext4_ext_binsearch_idx(struct inode *inode, struct ext4_ext_path *path, int block)
ext4_ext_binsearch_idx(struct inode *inode,
struct ext4_ext_path *path, ext4_lblk_t block)
{
struct ext4_extent_header *eh = path->p_hdr;
struct ext4_extent_idx *r, *l, *m;
ext_debug("binsearch for %d(idx): ", block);
ext_debug("binsearch for %lu(idx): ", (unsigned long)block);
l = EXT_FIRST_INDEX(eh) + 1;
r = EXT_LAST_INDEX(eh);
@@ -425,7 +426,8 @@ ext4_ext_binsearch_idx(struct inode *inode, struct ext4_ext_path *path, int bloc
* the header must be checked before calling this
*/
static void
ext4_ext_binsearch(struct inode *inode, struct ext4_ext_path *path, int block)
ext4_ext_binsearch(struct inode *inode,
struct ext4_ext_path *path, ext4_lblk_t block)
{
struct ext4_extent_header *eh = path->p_hdr;
struct ext4_extent *r, *l, *m;
@@ -438,7 +440,7 @@ ext4_ext_binsearch(struct inode *inode, struct ext4_ext_path *path, int block)
return;
}
ext_debug("binsearch for %d: ", block);
ext_debug("binsearch for %lu: ", (unsigned long)block);
l = EXT_FIRST_EXTENT(eh) + 1;
r = EXT_LAST_EXTENT(eh);
@@ -494,7 +496,8 @@ int ext4_ext_tree_init(handle_t *handle, struct inode *inode)
}
struct ext4_ext_path *
ext4_ext_find_extent(struct inode *inode, int block, struct ext4_ext_path *path)
ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
struct ext4_ext_path *path)
{
struct ext4_extent_header *eh;
struct buffer_head *bh;
@@ -979,8 +982,8 @@ repeat:
/* refill path */
ext4_ext_drop_refs(path);
path = ext4_ext_find_extent(inode,
le32_to_cpu(newext->ee_block),
path);
(ext4_lblk_t)le32_to_cpu(newext->ee_block),
path);
if (IS_ERR(path))
err = PTR_ERR(path);
} else {
@@ -992,8 +995,8 @@ repeat:
/* refill path */
ext4_ext_drop_refs(path);
path = ext4_ext_find_extent(inode,
le32_to_cpu(newext->ee_block),
path);
(ext4_lblk_t)le32_to_cpu(newext->ee_block),
path);
if (IS_ERR(path)) {
err = PTR_ERR(path);
goto out;
@@ -1021,7 +1024,7 @@ out:
* allocated block. Thus, index entries have to be consistent
* with leaves.
*/
static unsigned long
static ext4_lblk_t
ext4_ext_next_allocated_block(struct ext4_ext_path *path)
{
int depth;
@@ -1054,7 +1057,7 @@ ext4_ext_next_allocated_block(struct ext4_ext_path *path)
* ext4_ext_next_leaf_block:
* returns first allocated block from next leaf or EXT_MAX_BLOCK
*/
static unsigned ext4_ext_next_leaf_block(struct inode *inode,
static ext4_lblk_t ext4_ext_next_leaf_block(struct inode *inode,
struct ext4_ext_path *path)
{
int depth;
@@ -1072,7 +1075,8 @@ static unsigned ext4_ext_next_leaf_block(struct inode *inode,
while (depth >= 0) {
if (path[depth].p_idx !=
EXT_LAST_INDEX(path[depth].p_hdr))
return le32_to_cpu(path[depth].p_idx[1].ei_block);
return (ext4_lblk_t)
le32_to_cpu(path[depth].p_idx[1].ei_block);
depth--;
}
@@ -1239,7 +1243,7 @@ unsigned int ext4_ext_check_overlap(struct inode *inode,
struct ext4_extent *newext,
struct ext4_ext_path *path)
{
unsigned long b1, b2;
ext4_lblk_t b1, b2;
unsigned int depth, len1;
unsigned int ret = 0;
@@ -1260,7 +1264,7 @@ unsigned int ext4_ext_check_overlap(struct inode *inode,
goto out;
}
/* check for wrap through zero */
/* check for wrap through zero on extent logical start block*/
if (b1 + len1 < b1) {
len1 = EXT_MAX_BLOCK - b1;
newext->ee_len = cpu_to_le16(len1);
@@ -1290,7 +1294,8 @@ int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
struct ext4_extent *ex, *fex;
struct ext4_extent *nearex; /* nearest extent */
struct ext4_ext_path *npath = NULL;
int depth, len, err, next;
int depth, len, err;
ext4_lblk_t next;
unsigned uninitialized = 0;
BUG_ON(ext4_ext_get_actual_len(newext) == 0);
@@ -1435,114 +1440,8 @@ cleanup:
return err;
}
int ext4_ext_walk_space(struct inode *inode, unsigned long block,
unsigned long num, ext_prepare_callback func,
void *cbdata)
{
struct ext4_ext_path *path = NULL;
struct ext4_ext_cache cbex;
struct ext4_extent *ex;
unsigned long next, start = 0, end = 0;
unsigned long last = block + num;
int depth, exists, err = 0;
BUG_ON(func == NULL);
BUG_ON(inode == NULL);
while (block < last && block != EXT_MAX_BLOCK) {
num = last - block;
/* find extent for this block */
path = ext4_ext_find_extent(inode, block, path);
if (IS_ERR(path)) {
err = PTR_ERR(path);
path = NULL;
break;
}
depth = ext_depth(inode);
BUG_ON(path[depth].p_hdr == NULL);
ex = path[depth].p_ext;
next = ext4_ext_next_allocated_block(path);
exists = 0;
if (!ex) {
/* there is no extent yet, so try to allocate
* all requested space */
start = block;
end = block + num;
} else if (le32_to_cpu(ex->ee_block) > block) {
/* need to allocate space before found extent */
start = block;
end = le32_to_cpu(ex->ee_block);
if (block + num < end)
end = block + num;
} else if (block >= le32_to_cpu(ex->ee_block)
+ ext4_ext_get_actual_len(ex)) {
/* need to allocate space after found extent */
start = block;
end = block + num;
if (end >= next)
end = next;
} else if (block >= le32_to_cpu(ex->ee_block)) {
/*
* some part of requested space is covered
* by found extent
*/
start = block;
end = le32_to_cpu(ex->ee_block)
+ ext4_ext_get_actual_len(ex);
if (block + num < end)
end = block + num;
exists = 1;
} else {
BUG();
}
BUG_ON(end <= start);
if (!exists) {
cbex.ec_block = start;
cbex.ec_len = end - start;
cbex.ec_start = 0;
cbex.ec_type = EXT4_EXT_CACHE_GAP;
} else {
cbex.ec_block = le32_to_cpu(ex->ee_block);
cbex.ec_len = ext4_ext_get_actual_len(ex);
cbex.ec_start = ext_pblock(ex);
cbex.ec_type = EXT4_EXT_CACHE_EXTENT;
}
BUG_ON(cbex.ec_len == 0);
err = func(inode, path, &cbex, cbdata);
ext4_ext_drop_refs(path);
if (err < 0)
break;
if (err == EXT_REPEAT)
continue;
else if (err == EXT_BREAK) {
err = 0;
break;
}
if (ext_depth(inode) != depth) {
/* depth was changed. we have to realloc path */
kfree(path);
path = NULL;
}
block = cbex.ec_block + cbex.ec_len;
}
if (path) {
ext4_ext_drop_refs(path);
kfree(path);
}
return err;
}
static void
ext4_ext_put_in_cache(struct inode *inode, __u32 block,
ext4_ext_put_in_cache(struct inode *inode, ext4_lblk_t block,
__u32 len, ext4_fsblk_t start, int type)
{
struct ext4_ext_cache *cex;
@@ -1561,10 +1460,11 @@ ext4_ext_put_in_cache(struct inode *inode, __u32 block,
*/
static void
ext4_ext_put_gap_in_cache(struct inode *inode, struct ext4_ext_path *path,
unsigned long block)
ext4_lblk_t block)
{
int depth = ext_depth(inode);
unsigned long lblock, len;
unsigned long len;
ext4_lblk_t lblock;
struct ext4_extent *ex;
ex = path[depth].p_ext;
@@ -1582,15 +1482,17 @@ ext4_ext_put_gap_in_cache(struct inode *inode, struct ext4_ext_path *path,
(unsigned long) ext4_ext_get_actual_len(ex));
} else if (block >= le32_to_cpu(ex->ee_block)
+ ext4_ext_get_actual_len(ex)) {
ext4_lblk_t next;
lblock = le32_to_cpu(ex->ee_block)
+ ext4_ext_get_actual_len(ex);
len = ext4_ext_next_allocated_block(path);
next = ext4_ext_next_allocated_block(path);
ext_debug("cache gap(after): [%lu:%lu] %lu",
(unsigned long) le32_to_cpu(ex->ee_block),
(unsigned long) ext4_ext_get_actual_len(ex),
(unsigned long) block);
BUG_ON(len == lblock);
len = len - lblock;
BUG_ON(next == lblock);
len = next - lblock;
} else {
lblock = len = 0;
BUG();
@@ -1601,7 +1503,7 @@ ext4_ext_put_gap_in_cache(struct inode *inode, struct ext4_ext_path *path,
}
static int
ext4_ext_in_cache(struct inode *inode, unsigned long block,
ext4_ext_in_cache(struct inode *inode, ext4_lblk_t block,
struct ext4_extent *ex)
{
struct ext4_ext_cache *cex;
@@ -1714,7 +1616,7 @@ int ext4_ext_calc_credits_for_insert(struct inode *inode,
static int ext4_remove_blocks(handle_t *handle, struct inode *inode,
struct ext4_extent *ex,
unsigned long from, unsigned long to)
ext4_lblk_t from, ext4_lblk_t to)
{
struct buffer_head *bh;
unsigned short ee_len = ext4_ext_get_actual_len(ex);
@@ -1738,11 +1640,12 @@ static int ext4_remove_blocks(handle_t *handle, struct inode *inode,
if (from >= le32_to_cpu(ex->ee_block)
&& to == le32_to_cpu(ex->ee_block) + ee_len - 1) {
/* tail removal */
unsigned long num;
ext4_lblk_t num;
ext4_fsblk_t start;
num = le32_to_cpu(ex->ee_block) + ee_len - from;
start = ext_pblock(ex) + ee_len - num;
ext_debug("free last %lu blocks starting %llu\n", num, start);
ext_debug("free last %u blocks starting %llu\n", num, start);
for (i = 0; i < num; i++) {
bh = sb_find_get_block(inode->i_sb, start + i);
ext4_forget(handle, 0, inode, bh, start + i);
@@ -1750,30 +1653,32 @@ static int ext4_remove_blocks(handle_t *handle, struct inode *inode,
ext4_free_blocks(handle, inode, start, num);
} else if (from == le32_to_cpu(ex->ee_block)
&& to <= le32_to_cpu(ex->ee_block) + ee_len - 1) {
printk("strange request: removal %lu-%lu from %u:%u\n",
printk(KERN_INFO "strange request: removal %u-%u from %u:%u\n",
from, to, le32_to_cpu(ex->ee_block), ee_len);
} else {
printk("strange request: removal(2) %lu-%lu from %u:%u\n",
from, to, le32_to_cpu(ex->ee_block), ee_len);
printk(KERN_INFO "strange request: removal(2) "
"%u-%u from %u:%u\n",
from, to, le32_to_cpu(ex->ee_block), ee_len);
}
return 0;
}
static int
ext4_ext_rm_leaf(handle_t *handle, struct inode *inode,
struct ext4_ext_path *path, unsigned long start)
struct ext4_ext_path *path, ext4_lblk_t start)
{
int err = 0, correct_index = 0;
int depth = ext_depth(inode), credits;
struct ext4_extent_header *eh;
unsigned a, b, block, num;
unsigned long ex_ee_block;
ext4_lblk_t a, b, block;
unsigned num;
ext4_lblk_t ex_ee_block;
unsigned short ex_ee_len;
unsigned uninitialized = 0;
struct ext4_extent *ex;
/* the header must be checked already in ext4_ext_remove_space() */
ext_debug("truncate since %lu in leaf\n", start);
ext_debug("truncate since %u in leaf\n", start);
if (!path[depth].p_hdr)
path[depth].p_hdr = ext_block_hdr(path[depth].p_bh);
eh = path[depth].p_hdr;
@@ -1904,7 +1809,7 @@ ext4_ext_more_to_rm(struct ext4_ext_path *path)
return 1;
}
int ext4_ext_remove_space(struct inode *inode, unsigned long start)
int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start)
{
struct super_block *sb = inode->i_sb;
int depth = ext_depth(inode);
@@ -1912,7 +1817,7 @@ int ext4_ext_remove_space(struct inode *inode, unsigned long start)
handle_t *handle;
int i = 0, err = 0;
ext_debug("truncate since %lu\n", start);
ext_debug("truncate since %u\n", start);
/* probably first extent we're gonna free will be last in block */
handle = ext4_journal_start(inode, depth + 1);
@@ -2094,17 +1999,19 @@ void ext4_ext_release(struct super_block *sb)
* b> Splits in two extents: Write is happening at either end of the extent
* c> Splits in three extents: Somone is writing in middle of the extent
*/
int ext4_ext_convert_to_initialized(handle_t *handle, struct inode *inode,
struct ext4_ext_path *path,
ext4_fsblk_t iblock,
unsigned long max_blocks)
static int ext4_ext_convert_to_initialized(handle_t *handle,
struct inode *inode,
struct ext4_ext_path *path,
ext4_lblk_t iblock,
unsigned long max_blocks)
{
struct ext4_extent *ex, newex;
struct ext4_extent *ex1 = NULL;
struct ext4_extent *ex2 = NULL;
struct ext4_extent *ex3 = NULL;
struct ext4_extent_header *eh;
unsigned int allocated, ee_block, ee_len, depth;
ext4_lblk_t ee_block;
unsigned int allocated, ee_len, depth;
ext4_fsblk_t newblock;
int err = 0;
int ret = 0;
@@ -2226,7 +2133,7 @@ out:
}
int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
ext4_fsblk_t iblock,
ext4_lblk_t iblock,
unsigned long max_blocks, struct buffer_head *bh_result,
int create, int extend_disksize)
{
@@ -2238,8 +2145,9 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
unsigned long allocated = 0;
__clear_bit(BH_New, &bh_result->b_state);
ext_debug("blocks %d/%lu requested for inode %u\n", (int) iblock,
max_blocks, (unsigned) inode->i_ino);
ext_debug("blocks %lu/%lu requested for inode %u\n",
(unsigned long) iblock, max_blocks,
(unsigned) inode->i_ino);
mutex_lock(&EXT4_I(inode)->truncate_mutex);
/* check in cache */
@@ -2288,7 +2196,7 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
ex = path[depth].p_ext;
if (ex) {
unsigned long ee_block = le32_to_cpu(ex->ee_block);
ext4_lblk_t ee_block = le32_to_cpu(ex->ee_block);
ext4_fsblk_t ee_start = ext_pblock(ex);
unsigned short ee_len;
@@ -2423,7 +2331,7 @@ void ext4_ext_truncate(struct inode * inode, struct page *page)
{
struct address_space *mapping = inode->i_mapping;
struct super_block *sb = inode->i_sb;
unsigned long last_block;
ext4_lblk_t last_block;
handle_t *handle;
int err = 0;
@@ -2516,7 +2424,8 @@ int ext4_ext_writepage_trans_blocks(struct inode *inode, int num)
long ext4_fallocate(struct inode *inode, int mode, loff_t offset, loff_t len)
{
handle_t *handle;
ext4_fsblk_t block, max_blocks;
ext4_lblk_t block;
unsigned long max_blocks;
ext4_fsblk_t nblocks = 0;
int ret = 0;
int ret2 = 0;
@@ -2561,8 +2470,9 @@ retry:
if (!ret) {
ext4_error(inode->i_sb, "ext4_fallocate",
"ext4_ext_get_blocks returned 0! inode#%lu"
", block=%llu, max_blocks=%llu",
inode->i_ino, block, max_blocks);
", block=%lu, max_blocks=%lu",
inode->i_ino, (unsigned long)block,
(unsigned long)max_blocks);
ret = -EIO;
ext4_mark_inode_dirty(handle, inode);
ret2 = ext4_journal_stop(handle);