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Date: Thu, 31 Jan 2013 13:17:50 +0800
From: Zheng Liu <gnehzuil.liu@...il.com>
To: linux-ext4@...r.kernel.org
Cc: Zheng Liu <wenqing.lz@...bao.com>, "Theodore Ts'o" <tytso@....edu>
Subject: [PATCH 2/9 v4] ext4: remove EXT4_MAP_FROM_CLUSTER flag
From: Zheng Liu <wenqing.lz@...bao.com>
EXT4_MAP_FROM_CLUSTER flag is only used in ext4_da_map_blocks() and
ext4_ext_map_blocks() to indicate whether a cluster has been reserved or
not. But in ext4_da_map_blocks() we can check it directly. Meanwhile
this flag couldn't appear on the buffer head. So it can be replaced
with a local variable.
Signed-off-by: Zheng Liu <wenqing.lz@...bao.com>
Cc: "Theodore Ts'o" <tytso@....edu>
---
fs/ext4/ext4.h | 15 +--------------
fs/ext4/extents.c | 18 ++++--------------
fs/ext4/inode.c | 11 ++---------
3 files changed, 7 insertions(+), 37 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 8462eb3..36145ef1 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -155,17 +155,9 @@ struct ext4_allocation_request {
#define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
#define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
#define EXT4_MAP_UNINIT (1 << BH_Uninit)
-/* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of
- * ext4_map_blocks wants to know whether or not the underlying cluster has
- * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that
- * the requested mapping was from previously mapped (or delayed allocated)
- * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster
- * should never appear on buffer_head's state flags.
- */
-#define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster)
#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
- EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER)
+ EXT4_MAP_UNINIT)
struct ext4_map_blocks {
ext4_fsblk_t m_pblk;
@@ -2553,11 +2545,6 @@ extern int ext4_mmp_csum_verify(struct super_block *sb,
enum ext4_state_bits {
BH_Uninit /* blocks are allocated but uninitialized on disk */
= BH_JBDPrivateStart,
- BH_AllocFromCluster, /* allocated blocks were part of already
- * allocated cluster. Note that this flag will
- * never, ever appear in a buffer_head's state
- * flag. See EXT4_MAP_FROM_CLUSTER to see where
- * this is used. */
};
BUFFER_FNS(Uninit, uninit)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index f7bf616..aa9a6d2 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3894,6 +3894,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
ext4_io_end_t *io = ext4_inode_aio(inode);
ext4_lblk_t cluster_offset;
int set_unwritten = 0;
+ int from_cluster = 0;
ext_debug("blocks %u/%u requested for inode %lu\n",
map->m_lblk, map->m_len, inode->i_ino);
@@ -3902,10 +3903,6 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
/* check in cache */
if (ext4_ext_in_cache(inode, map->m_lblk, &newex)) {
if (!newex.ee_start_lo && !newex.ee_start_hi) {
- if ((sbi->s_cluster_ratio > 1) &&
- ext4_find_delalloc_cluster(inode, map->m_lblk))
- map->m_flags |= EXT4_MAP_FROM_CLUSTER;
-
if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
/*
* block isn't allocated yet and
@@ -3916,8 +3913,6 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
/* we should allocate requested block */
} else {
/* block is already allocated */
- if (sbi->s_cluster_ratio > 1)
- map->m_flags |= EXT4_MAP_FROM_CLUSTER;
newblock = map->m_lblk
- le32_to_cpu(newex.ee_block)
+ ext4_ext_pblock(&newex);
@@ -3990,10 +3985,6 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
}
}
- if ((sbi->s_cluster_ratio > 1) &&
- ext4_find_delalloc_cluster(inode, map->m_lblk))
- map->m_flags |= EXT4_MAP_FROM_CLUSTER;
-
/*
* requested block isn't allocated yet;
* we couldn't try to create block if create flag is zero
@@ -4010,7 +4001,6 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
/*
* Okay, we need to do block allocation.
*/
- map->m_flags &= ~EXT4_MAP_FROM_CLUSTER;
newex.ee_block = cpu_to_le32(map->m_lblk);
cluster_offset = map->m_lblk & (sbi->s_cluster_ratio-1);
@@ -4022,7 +4012,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
get_implied_cluster_alloc(inode->i_sb, map, ex, path)) {
ar.len = allocated = map->m_len;
newblock = map->m_pblk;
- map->m_flags |= EXT4_MAP_FROM_CLUSTER;
+ from_cluster = 1;
goto got_allocated_blocks;
}
@@ -4043,7 +4033,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
get_implied_cluster_alloc(inode->i_sb, map, ex2, path)) {
ar.len = allocated = map->m_len;
newblock = map->m_pblk;
- map->m_flags |= EXT4_MAP_FROM_CLUSTER;
+ from_cluster = 1;
goto got_allocated_blocks;
}
@@ -4168,7 +4158,7 @@ got_allocated_blocks:
*/
reserved_clusters = get_reserved_cluster_alloc(inode,
map->m_lblk, allocated);
- if (map->m_flags & EXT4_MAP_FROM_CLUSTER) {
+ if (from_cluster) {
if (reserved_clusters) {
/*
* We have clusters reserved for this range.
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index cbfe13b..4d066f3 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1798,9 +1798,6 @@ static int ext4_da_map_blocks(struct inode *inode, sector_t iblock,
* of mapping from cluster so that the reserved space
* is calculated properly.
*/
- if ((EXT4_SB(inode->i_sb)->s_cluster_ratio > 1) &&
- ext4_find_delalloc_cluster(inode, map->m_lblk))
- map->m_flags |= EXT4_MAP_FROM_CLUSTER;
retval = 0;
} else if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
retval = ext4_ext_map_blocks(NULL, inode, map, 0);
@@ -1814,7 +1811,8 @@ static int ext4_da_map_blocks(struct inode *inode, sector_t iblock,
*/
/* If the block was allocated from previously allocated cluster,
* then we dont need to reserve it again. */
- if (!(map->m_flags & EXT4_MAP_FROM_CLUSTER)) {
+ if ((EXT4_SB(inode->i_sb)->s_cluster_ratio == 1) ||
+ !ext4_find_delalloc_cluster(inode, map->m_lblk)) {
retval = ext4_da_reserve_space(inode, iblock);
if (retval)
/* not enough space to reserve */
@@ -1825,11 +1823,6 @@ static int ext4_da_map_blocks(struct inode *inode, sector_t iblock,
if (retval)
goto out_unlock;
- /* Clear EXT4_MAP_FROM_CLUSTER flag since its purpose is served
- * and it should not appear on the bh->b_state.
- */
- map->m_flags &= ~EXT4_MAP_FROM_CLUSTER;
-
map_bh(bh, inode->i_sb, invalid_block);
set_buffer_new(bh);
set_buffer_delay(bh);
--
1.7.12.rc2.18.g61b472e
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