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Date: Tue, 4 Jan 2011 20:01:07 -0500
From: Theodore Ts'o <tytso@....edu>
To: Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc: Theodore Ts'o <tytso@....edu>
Subject: [PATCH 3/6] ext4: Drop ec_type from the ext4_ext_cache structure
We can encode the ec_type information by using ee_len == 0 to denote
EXT4_EXT_CACHE_NO, ee_start == 0 to denote EXT4_EXT_CACHE_GAP, and if
neither is true, then the cache type must be EXT4_EXT_CACHE_EXTENT.
This allows us to reduce the size of ext4_ext_inode by another 8
bytes. (ec_type is 4 bytes, plus another 4 bytes of padding)
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
---
fs/ext4/ext4.h | 3 ++-
fs/ext4/ext4_extents.h | 6 +-----
fs/ext4/extents.c | 37 +++++++++++++++----------------------
3 files changed, 18 insertions(+), 28 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 746a598..de937fc 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -738,12 +738,13 @@ do { \
/*
* storage for cached extent
+ * If ec_len == 0, then the cache is invalid.
+ * If ec_start == 0, then the cache represents a gap (null mapping)
*/
struct ext4_ext_cache {
ext4_fsblk_t ec_start;
ext4_lblk_t ec_block;
__u32 ec_len; /* must be 32bit to return holes */
- __u32 ec_type;
};
/*
diff --git a/fs/ext4/ext4_extents.h b/fs/ext4/ext4_extents.h
index dfdda17..2e29abb 100644
--- a/fs/ext4/ext4_extents.h
+++ b/fs/ext4/ext4_extents.h
@@ -119,10 +119,6 @@ struct ext4_ext_path {
* structure for external API
*/
-#define EXT4_EXT_CACHE_NO 0
-#define EXT4_EXT_CACHE_GAP 1
-#define EXT4_EXT_CACHE_EXTENT 2
-
/*
* to be called by ext4_ext_walk_space()
* negative retcode - error
@@ -197,7 +193,7 @@ static inline unsigned short ext_depth(struct inode *inode)
static inline void
ext4_ext_invalidate_cache(struct inode *inode)
{
- EXT4_I(inode)->i_cached_extent.ec_type = EXT4_EXT_CACHE_NO;
+ EXT4_I(inode)->i_cached_extent.ec_len = 0;
}
static inline void ext4_ext_mark_uninitialized(struct ext4_extent *ext)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index a16fe91..a643b50 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -1894,12 +1894,10 @@ static int ext4_ext_walk_space(struct inode *inode, ext4_lblk_t block,
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 = ext4_ext_pblock(ex);
- cbex.ec_type = EXT4_EXT_CACHE_EXTENT;
}
if (unlikely(cbex.ec_len == 0)) {
@@ -1939,13 +1937,12 @@ static int ext4_ext_walk_space(struct inode *inode, ext4_lblk_t block,
static void
ext4_ext_put_in_cache(struct inode *inode, ext4_lblk_t block,
- __u32 len, ext4_fsblk_t start, int type)
+ __u32 len, ext4_fsblk_t start)
{
struct ext4_ext_cache *cex;
BUG_ON(len == 0);
spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
cex = &EXT4_I(inode)->i_cached_extent;
- cex->ec_type = type;
cex->ec_block = block;
cex->ec_len = len;
cex->ec_start = start;
@@ -1998,15 +1995,18 @@ ext4_ext_put_gap_in_cache(struct inode *inode, struct ext4_ext_path *path,
}
ext_debug(" -> %u:%lu\n", lblock, len);
- ext4_ext_put_in_cache(inode, lblock, len, 0, EXT4_EXT_CACHE_GAP);
+ ext4_ext_put_in_cache(inode, lblock, len, 0);
}
+/*
+ * Return 0 if cache is invalid; 1 if the cache is valid
+ */
static int
ext4_ext_in_cache(struct inode *inode, ext4_lblk_t block,
struct ext4_extent *ex)
{
struct ext4_ext_cache *cex;
- int ret = EXT4_EXT_CACHE_NO;
+ int ret = 0;
/*
* We borrow i_block_reservation_lock to protect i_cached_extent
@@ -2015,11 +2015,9 @@ ext4_ext_in_cache(struct inode *inode, ext4_lblk_t block,
cex = &EXT4_I(inode)->i_cached_extent;
/* has cache valid data? */
- if (cex->ec_type == EXT4_EXT_CACHE_NO)
+ if (cex->ec_len == 0)
goto errout;
- BUG_ON(cex->ec_type != EXT4_EXT_CACHE_GAP &&
- cex->ec_type != EXT4_EXT_CACHE_EXTENT);
if (in_range(block, cex->ec_block, cex->ec_len)) {
ex->ee_block = cpu_to_le32(cex->ec_block);
ext4_ext_store_pblock(ex, cex->ec_start);
@@ -2027,7 +2025,7 @@ ext4_ext_in_cache(struct inode *inode, ext4_lblk_t block,
ext_debug("%u cached by %u:%u:%llu\n",
block,
cex->ec_block, cex->ec_len, cex->ec_start);
- ret = cex->ec_type;
+ ret = 1;
}
errout:
spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
@@ -3298,7 +3296,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
struct ext4_extent_header *eh;
struct ext4_extent newex, *ex;
ext4_fsblk_t newblock;
- int err = 0, depth, ret, cache_type;
+ int err = 0, depth, ret;
unsigned int allocated = 0;
struct ext4_allocation_request ar;
ext4_io_end_t *io = EXT4_I(inode)->cur_aio_dio;
@@ -3307,9 +3305,8 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
map->m_lblk, map->m_len, inode->i_ino);
/* check in cache */
- cache_type = ext4_ext_in_cache(inode, map->m_lblk, &newex);
- if (cache_type) {
- if (cache_type == EXT4_EXT_CACHE_GAP) {
+ if (ext4_ext_in_cache(inode, map->m_lblk, &newex)) {
+ if (!newex.ee_start_lo && !newex.ee_start_hi) {
if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
/*
* block isn't allocated yet and
@@ -3318,7 +3315,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
goto out2;
}
/* we should allocate requested block */
- } else if (cache_type == EXT4_EXT_CACHE_EXTENT) {
+ } else {
/* block is already allocated */
newblock = map->m_lblk
- le32_to_cpu(newex.ee_block)
@@ -3327,8 +3324,6 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
allocated = ext4_ext_get_actual_len(&newex) -
(map->m_lblk - le32_to_cpu(newex.ee_block));
goto out;
- } else {
- BUG();
}
}
@@ -3379,8 +3374,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
/* Do not put uninitialized extent in the cache */
if (!ext4_ext_is_uninitialized(ex)) {
ext4_ext_put_in_cache(inode, ee_block,
- ee_len, ee_start,
- EXT4_EXT_CACHE_EXTENT);
+ ee_len, ee_start);
goto out;
}
ret = ext4_ext_handle_uninitialized_extents(handle,
@@ -3512,8 +3506,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
* when it is _not_ an uninitialized extent.
*/
if ((flags & EXT4_GET_BLOCKS_UNINIT_EXT) == 0) {
- ext4_ext_put_in_cache(inode, map->m_lblk, allocated, newblock,
- EXT4_EXT_CACHE_EXTENT);
+ ext4_ext_put_in_cache(inode, map->m_lblk, allocated, newblock);
ext4_update_inode_fsync_trans(handle, inode, 1);
} else
ext4_update_inode_fsync_trans(handle, inode, 0);
@@ -3789,7 +3782,7 @@ static int ext4_ext_fiemap_cb(struct inode *inode, struct ext4_ext_path *path,
logical = (__u64)newex->ec_block << blksize_bits;
- if (newex->ec_type == EXT4_EXT_CACHE_GAP) {
+ if (newex->ec_start == 0) {
pgoff_t offset;
struct page *page;
struct buffer_head *bh = NULL;
--
1.7.3.1
--
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