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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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
fs/ext4/extents_status.c
View File

@ -263,7 +263,7 @@ void ext4_es_find_delayed_extent_range(struct inode *inode,
if (tree->cache_es) {
es1 = tree->cache_es;
if (in_range(lblk, es1->es_lblk, es1->es_len)) {
es_debug("%u cached by [%u/%u) %llu %llx\n",
es_debug("%u cached by [%u/%u) %llu %x\n",
lblk, es1->es_lblk, es1->es_len,
ext4_es_pblock(es1), ext4_es_status(es1));
goto out;
@ -641,13 +641,13 @@ static int __es_insert_extent(struct inode *inode, struct extent_status *newes)
*/
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)
{
struct extent_status newes;
ext4_lblk_t end = lblk + len - 1;
int err = 0;
es_debug("add [%u/%u) %llu %llx to extent status tree of inode %lu\n",
es_debug("add [%u/%u) %llu %x to extent status tree of inode %lu\n",
lblk, len, pblk, status, inode->i_ino);
if (!len)

47
fs/ext4/extents_status.h
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);

6
fs/ext4/inode.c
View File

@ -553,7 +553,7 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
}
if (retval > 0) {
int ret;
unsigned long long status;
unsigned int status;
if (unlikely(retval != map->m_len)) {
ext4_warning(inode->i_sb,
@ -653,7 +653,7 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
if (retval > 0) {
int ret;
unsigned long long status;
unsigned int status;
if (unlikely(retval != map->m_len)) {
ext4_warning(inode->i_sb,
@ -1633,7 +1633,7 @@ static int ext4_da_map_blocks(struct inode *inode, sector_t iblock,
set_buffer_delay(bh);
} else if (retval > 0) {
int ret;
unsigned long long status;
unsigned int status;
if (unlikely(retval != map->m_len)) {
ext4_warning(inode->i_sb,

14
include/trace/events/ext4.h
View File

@ -64,10 +64,10 @@ struct extent_status;
{ EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER, "LAST_CLUSTER" })
#define show_extent_status(status) __print_flags(status, "", \
{ (1 << 3), "W" }, \
{ (1 << 2), "U" }, \
{ (1 << 1), "D" }, \
{ (1 << 0), "H" })
{ EXTENT_STATUS_WRITTEN, "W" }, \
{ EXTENT_STATUS_UNWRITTEN, "U" }, \
{ EXTENT_STATUS_DELAYED, "D" }, \
{ EXTENT_STATUS_HOLE, "H" })
TRACE_EVENT(ext4_free_inode,
@ -2212,7 +2212,7 @@ TRACE_EVENT(ext4_es_insert_extent,
__entry->lblk = es->es_lblk;
__entry->len = es->es_len;
__entry->pblk = ext4_es_pblock(es);
__entry->status = ext4_es_status(es) >> 60;
__entry->status = ext4_es_status(es);
),
TP_printk("dev %d,%d ino %lu es [%u/%u) mapped %llu status %s",
@ -2289,7 +2289,7 @@ TRACE_EVENT(ext4_es_find_delayed_extent_range_exit,
__entry->lblk = es->es_lblk;
__entry->len = es->es_len;
__entry->pblk = ext4_es_pblock(es);
__entry->status = ext4_es_status(es) >> 60;
__entry->status = ext4_es_status(es);
),
TP_printk("dev %d,%d ino %lu es [%u/%u) mapped %llu status %s",
@ -2343,7 +2343,7 @@ TRACE_EVENT(ext4_es_lookup_extent_exit,
__entry->lblk = es->es_lblk;
__entry->len = es->es_len;
__entry->pblk = ext4_es_pblock(es);
__entry->status = ext4_es_status(es) >> 60;
__entry->status = ext4_es_status(es);
__entry->found = found;
),