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ext4: use unsigned int for es_status values

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Don't use an unsigned long long for the es_status flags; this requires
that we pass 64-bit values around which is painful on 32-bit systems.
Instead pass the extent status flags around using the low 4 bits of an
unsigned int, and shift them into place when we are reading or writing
es_pblk.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
This commit is contained in:
Theodore Ts'o
2013-08-16 21:22:41 -04:00
parent c349179b48
commit 3be78c7317
4 changed files with 40 additions and 33 deletions
Download Patch File Download Diff File Expand all files Collapse all files
fs/ext4/extents_status.h
+27 -20
View File
@@ -29,16 +29,26 @@
/*
* These flags live in the high bits of extent_status.es_pblk
*/
#define EXTENT_STATUS_WRITTEN (1ULL << 63)
#define EXTENT_STATUS_UNWRITTEN (1ULL << 62)
#define EXTENT_STATUS_DELAYED (1ULL << 61)
#define EXTENT_STATUS_HOLE (1ULL << 60)
#define ES_SHIFT 60
#define EXTENT_STATUS_WRITTEN (1 << 3)
#define EXTENT_STATUS_UNWRITTEN (1 << 2)
#define EXTENT_STATUS_DELAYED (1 << 1)
#define EXTENT_STATUS_HOLE (1 << 0)
#define EXTENT_STATUS_FLAGS (EXTENT_STATUS_WRITTEN | \
EXTENT_STATUS_UNWRITTEN | \
EXTENT_STATUS_DELAYED | \
EXTENT_STATUS_HOLE)
#define ES_WRITTEN (1ULL << 63)
#define ES_UNWRITTEN (1ULL << 62)
#define ES_DELAYED (1ULL << 61)
#define ES_HOLE (1ULL << 60)
#define ES_MASK (ES_WRITTEN | ES_UNWRITTEN | \
ES_DELAYED | ES_HOLE)
struct ext4_sb_info;
struct ext4_extent;
@@ -60,7 +70,7 @@ extern void ext4_es_init_tree(struct ext4_es_tree *tree);
extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
ext4_lblk_t len, ext4_fsblk_t pblk,
unsigned long long status);
unsigned int status);
extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
ext4_lblk_t len);
extern void ext4_es_find_delayed_extent_range(struct inode *inode,
@@ -72,32 +82,32 @@ extern int ext4_es_zeroout(struct inode *inode, struct ext4_extent *ex);
static inline int ext4_es_is_written(struct extent_status *es)
{
return (es->es_pblk & EXTENT_STATUS_WRITTEN) != 0;
return (es->es_pblk & ES_WRITTEN) != 0;
}
static inline int ext4_es_is_unwritten(struct extent_status *es)
{
return (es->es_pblk & EXTENT_STATUS_UNWRITTEN) != 0;
return (es->es_pblk & ES_UNWRITTEN) != 0;
}
static inline int ext4_es_is_delayed(struct extent_status *es)
{
return (es->es_pblk & EXTENT_STATUS_DELAYED) != 0;
return (es->es_pblk & ES_DELAYED) != 0;
}
static inline int ext4_es_is_hole(struct extent_status *es)
{
return (es->es_pblk & EXTENT_STATUS_HOLE) != 0;
return (es->es_pblk & ES_HOLE) != 0;
}
static inline ext4_fsblk_t ext4_es_status(struct extent_status *es)
static inline unsigned int ext4_es_status(struct extent_status *es)
{
return (es->es_pblk & EXTENT_STATUS_FLAGS);
return es->es_pblk >> ES_SHIFT;
}
static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es)
{
return (es->es_pblk & ~EXTENT_STATUS_FLAGS);
return es->es_pblk & ~ES_MASK;
}
static inline void ext4_es_store_pblock(struct extent_status *es,
@@ -105,19 +115,16 @@ static inline void ext4_es_store_pblock(struct extent_status *es,
{
ext4_fsblk_t block;
block = (pb & ~EXTENT_STATUS_FLAGS) |
(es->es_pblk & EXTENT_STATUS_FLAGS);
block = (pb & ~ES_MASK) | (es->es_pblk & ES_MASK);
es->es_pblk = block;
}
static inline void ext4_es_store_status(struct extent_status *es,
unsigned long long status)
unsigned int status)
{
ext4_fsblk_t block;
block = (status & EXTENT_STATUS_FLAGS) |
(es->es_pblk & ~EXTENT_STATUS_FLAGS);
es->es_pblk = block;
es->es_pblk = (((ext4_fsblk_t)
(status & EXTENT_STATUS_FLAGS) << ES_SHIFT) |
(es->es_pblk & ~ES_MASK));
}
extern void ext4_es_register_shrinker(struct ext4_sb_info *sbi);