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ext4: Define a new set of flags for ext4_get_blocks()

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The functions ext4_get_blocks(), ext4_ext_get_blocks(), and
ext4_ind_get_blocks() used an ad-hoc set of integer variables used as
boolean flags passed in as arguments.  Use a single flags parameter
and a setandard set of bitfield flags instead.  This saves space on
the call stack, and it also makes the code a bit more understandable.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o
2009-05-14 00:58:52 -04:00
parent 12b7ac1768
commit c217705733
4 changed files with 57 additions and 46 deletions
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22
fs/ext4/extents.c
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@@ -2784,7 +2784,7 @@ fix_extent_len:
int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
ext4_lblk_t iblock,
unsigned int max_blocks, struct buffer_head *bh_result,
int create, int extend_disksize)
int flags)
{
struct ext4_ext_path *path = NULL;
struct ext4_extent_header *eh;
@@ -2803,7 +2803,7 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
cache_type = ext4_ext_in_cache(inode, iblock, &newex);
if (cache_type) {
if (cache_type == EXT4_EXT_CACHE_GAP) {
if (!create) {
if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
/*
* block isn't allocated yet and
* user doesn't want to allocate it
@@ -2869,9 +2869,9 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
EXT4_EXT_CACHE_EXTENT);
goto out;
}
if (create == EXT4_CREATE_UNINITIALIZED_EXT)
if (flags & EXT4_GET_BLOCKS_UNINIT_EXT)
goto out;
if (!create) {
if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
if (allocated > max_blocks)
allocated = max_blocks;
/*
@@ -2903,7 +2903,7 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
* requested block isn't allocated yet;
* we couldn't try to create block if create flag is zero
*/
if (!create) {
if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
/*
* put just found gap into cache to speed up
* subsequent requests
@@ -2932,10 +2932,10 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
* EXT_UNINIT_MAX_LEN.
*/
if (max_blocks > EXT_INIT_MAX_LEN &&
create != EXT4_CREATE_UNINITIALIZED_EXT)
!(flags & EXT4_GET_BLOCKS_UNINIT_EXT))
max_blocks = EXT_INIT_MAX_LEN;
else if (max_blocks > EXT_UNINIT_MAX_LEN &&
create == EXT4_CREATE_UNINITIALIZED_EXT)
(flags & EXT4_GET_BLOCKS_UNINIT_EXT))
max_blocks = EXT_UNINIT_MAX_LEN;
/* Check if we can really insert (iblock)::(iblock+max_blocks) extent */
@@ -2966,7 +2966,7 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
/* try to insert new extent into found leaf and return */
ext4_ext_store_pblock(&newex, newblock);
newex.ee_len = cpu_to_le16(ar.len);
if (create == EXT4_CREATE_UNINITIALIZED_EXT) /* Mark uninitialized */
if (flags & EXT4_GET_BLOCKS_UNINIT_EXT) /* Mark uninitialized */
ext4_ext_mark_uninitialized(&newex);
err = ext4_ext_insert_extent(handle, inode, path, &newex);
if (err) {
@@ -2983,7 +2983,7 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
newblock = ext_pblock(&newex);
allocated = ext4_ext_get_actual_len(&newex);
outnew:
if (extend_disksize) {
if (flags & EXT4_GET_BLOCKS_EXTEND_DISKSIZE) {
disksize = ((loff_t) iblock + ar.len) << inode->i_blkbits;
if (disksize > i_size_read(inode))
disksize = i_size_read(inode);
@@ -2994,7 +2994,7 @@ outnew:
set_buffer_new(bh_result);
/* Cache only when it is _not_ an uninitialized extent */
if (create != EXT4_CREATE_UNINITIALIZED_EXT)
if ((flags & EXT4_GET_BLOCKS_UNINIT_EXT) == 0)
ext4_ext_put_in_cache(inode, iblock, allocated, newblock,
EXT4_EXT_CACHE_EXTENT);
out:
@@ -3153,7 +3153,7 @@ retry:
map_bh.b_state = 0;
ret = ext4_get_blocks(handle, inode, block,
max_blocks, &map_bh,
EXT4_CREATE_UNINITIALIZED_EXT, 0, 0);
EXT4_GET_BLOCKS_CREATE_UNINIT_EXT);
if (ret <= 0) {
#ifdef EXT4FS_DEBUG
WARN_ON(ret <= 0);