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ext4: collapse ext4_convert_initialized_extents() 

The function ext4_convert_initialized_extents() is only called by a
single function --- ext4_ext_convert_initalized_extents().  Inline the
code and get rid of the unnecessary bits in order to simplify the code.

Rename ext4_ext_convert_initalized_extents() to
convert_initalized_extents() since it's a static function that is
actually only used in a single caller, ext4_ext_map_blocks().

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2014-09-01 14:35:09 -04:00
parent 705912ca95
commit e8b83d9303
1 changed files with 59 additions and 77 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

136
fs/ext4/extents.c
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@ -3677,67 +3677,6 @@ static int ext4_split_convert_extents(handle_t *handle,
return ext4_split_extent(handle, inode, path, map, split_flag, flags);
}
static int ext4_convert_initialized_extents(handle_t *handle,
struct inode *inode,
struct ext4_map_blocks *map,
struct ext4_ext_path *path)
{
struct ext4_extent *ex;
ext4_lblk_t ee_block;
unsigned int ee_len;
int depth;
int err = 0;
depth = ext_depth(inode);
ex = path[depth].p_ext;
ee_block = le32_to_cpu(ex->ee_block);
ee_len = ext4_ext_get_actual_len(ex);
ext_debug("%s: inode %lu, logical"
"block %llu, max_blocks %u\n", __func__, inode->i_ino,
(unsigned long long)ee_block, ee_len);
if (ee_block != map->m_lblk || ee_len > map->m_len) {
err = ext4_split_convert_extents(handle, inode, map, path,
EXT4_GET_BLOCKS_CONVERT_UNWRITTEN);
if (err < 0)
goto out;
ext4_ext_drop_refs(path);
path = ext4_ext_find_extent(inode, map->m_lblk, &path,
EXT4_EX_NOFREE_ON_ERR);
if (IS_ERR(path)) {
err = PTR_ERR(path);
goto out;
}
depth = ext_depth(inode);
ex = path[depth].p_ext;
if (!ex) {
EXT4_ERROR_INODE(inode, "unexpected hole at %lu",
(unsigned long) map->m_lblk);
err = -EIO;
goto out;
}
}
err = ext4_ext_get_access(handle, inode, path + depth);
if (err)
goto out;
/* first mark the extent as unwritten */
ext4_ext_mark_unwritten(ex);
/* note: ext4_ext_correct_indexes() isn't needed here because
* borders are not changed
*/
ext4_ext_try_to_merge(handle, inode, path, ex);
/* Mark modified extent as dirty */
err = ext4_ext_dirty(handle, inode, path + path->p_depth);
out:
ext4_ext_show_leaf(inode, path);
return err;
}
static int ext4_convert_unwritten_extents_endio(handle_t *handle,
struct inode *inode,
struct ext4_map_blocks *map,
@ -3974,12 +3913,15 @@ get_reserved_cluster_alloc(struct inode *inode, ext4_lblk_t lblk_start,
}
static int
ext4_ext_convert_initialized_extent(handle_t *handle, struct inode *inode,
struct ext4_map_blocks *map,
struct ext4_ext_path *path, int flags,
unsigned int allocated, ext4_fsblk_t newblock)
convert_initialized_extent(handle_t *handle, struct inode *inode,
struct ext4_map_blocks *map,
struct ext4_ext_path *path, int flags,
unsigned int allocated, ext4_fsblk_t newblock)
{
int ret = 0;
struct ext4_extent *ex;
ext4_lblk_t ee_block;
unsigned int ee_len;
int depth;
int err = 0;
/*
@ -3989,20 +3931,60 @@ ext4_ext_convert_initialized_extent(handle_t *handle, struct inode *inode,
if (map->m_len > EXT_UNWRITTEN_MAX_LEN)
map->m_len = EXT_UNWRITTEN_MAX_LEN / 2;
ret = ext4_convert_initialized_extents(handle, inode, map,
path);
if (ret >= 0) {
ext4_update_inode_fsync_trans(handle, inode, 1);
err = check_eofblocks_fl(handle, inode, map->m_lblk,
path, map->m_len);
} else
err = ret;
depth = ext_depth(inode);
ex = path[depth].p_ext;
ee_block = le32_to_cpu(ex->ee_block);
ee_len = ext4_ext_get_actual_len(ex);
ext_debug("%s: inode %lu, logical"
"block %llu, max_blocks %u\n", __func__, inode->i_ino,
(unsigned long long)ee_block, ee_len);
if (ee_block != map->m_lblk || ee_len > map->m_len) {
err = ext4_split_convert_extents(handle, inode, map, path,
EXT4_GET_BLOCKS_CONVERT_UNWRITTEN);
if (err < 0)
return err;
ext4_ext_drop_refs(path);
path = ext4_ext_find_extent(inode, map->m_lblk, &path,
EXT4_EX_NOFREE_ON_ERR);
if (IS_ERR(path))
return PTR_ERR(path);
depth = ext_depth(inode);
ex = path[depth].p_ext;
if (!ex) {
EXT4_ERROR_INODE(inode, "unexpected hole at %lu",
(unsigned long) map->m_lblk);
return -EIO;
}
}
err = ext4_ext_get_access(handle, inode, path + depth);
if (err)
return err;
/* first mark the extent as unwritten */
ext4_ext_mark_unwritten(ex);
/* note: ext4_ext_correct_indexes() isn't needed here because
* borders are not changed
*/
ext4_ext_try_to_merge(handle, inode, path, ex);
/* Mark modified extent as dirty */
err = ext4_ext_dirty(handle, inode, path + path->p_depth);
if (err)
return err;
ext4_ext_show_leaf(inode, path);
ext4_update_inode_fsync_trans(handle, inode, 1);
err = check_eofblocks_fl(handle, inode, map->m_lblk, path, map->m_len);
if (err)
return err;
map->m_flags |= EXT4_MAP_UNWRITTEN;
if (allocated > map->m_len)
allocated = map->m_len;
map->m_len = allocated;
return err ? err : allocated;
return allocated;
}
static int
@ -4342,7 +4324,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
*/
if ((!ext4_ext_is_unwritten(ex)) &&
(flags & EXT4_GET_BLOCKS_CONVERT_UNWRITTEN)) {
allocated = ext4_ext_convert_initialized_extent(
allocated = convert_initialized_extent(
handle, inode, map, path, flags,
allocated, newblock);
goto out2;