diff options
| -rw-r--r-- | fs/ext4/extents_status.c | 2 | ||||
| -rw-r--r-- | fs/ext4/extents_status.h | 58 |
2 files changed, 28 insertions, 32 deletions
diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c index 8f2aac4006d2..30596498ed0b 100644 --- a/fs/ext4/extents_status.c +++ b/fs/ext4/extents_status.c @@ -1174,6 +1174,8 @@ int ext4_es_register_shrinker(struct ext4_sb_info *sbi) { int err; + /* Make sure we have enough bits for physical block number */ + BUILD_BUG_ON(ES_SHIFT < 48); INIT_LIST_HEAD(&sbi->s_es_list); sbi->s_es_nr_inode = 0; spin_lock_init(&sbi->s_es_lock); diff --git a/fs/ext4/extents_status.h b/fs/ext4/extents_status.h index b0b78b95f481..e86b1f34cfec 100644 --- a/fs/ext4/extents_status.h +++ b/fs/ext4/extents_status.h @@ -29,25 +29,21 @@ /* * These flags live in the high bits of extent_status.es_pblk */ -#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) +enum { + ES_WRITTEN_B, + ES_UNWRITTEN_B, + ES_DELAYED_B, + ES_HOLE_B, + ES_FLAGS +}; -#define ES_WRITTEN (1ULL << 63) -#define ES_UNWRITTEN (1ULL << 62) -#define ES_DELAYED (1ULL << 61) -#define ES_HOLE (1ULL << 60) +#define ES_SHIFT (sizeof(ext4_fsblk_t)*8 - ES_FLAGS) +#define ES_MASK (~((ext4_fsblk_t)0) << ES_SHIFT) -#define ES_MASK (ES_WRITTEN | ES_UNWRITTEN | \ - ES_DELAYED | ES_HOLE) +#define EXTENT_STATUS_WRITTEN (1 << ES_WRITTEN_B) +#define EXTENT_STATUS_UNWRITTEN (1 << ES_UNWRITTEN_B) +#define EXTENT_STATUS_DELAYED (1 << ES_DELAYED_B) +#define EXTENT_STATUS_HOLE (1 << ES_HOLE_B) struct ext4_sb_info; struct ext4_extent; @@ -92,29 +88,29 @@ extern void ext4_es_find_delayed_extent_range(struct inode *inode, extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk, struct extent_status *es); +static inline unsigned int ext4_es_status(struct extent_status *es) +{ + return es->es_pblk >> ES_SHIFT; +} + static inline int ext4_es_is_written(struct extent_status *es) { - return (es->es_pblk & ES_WRITTEN) != 0; + return (ext4_es_status(es) & EXTENT_STATUS_WRITTEN) != 0; } static inline int ext4_es_is_unwritten(struct extent_status *es) { - return (es->es_pblk & ES_UNWRITTEN) != 0; + return (ext4_es_status(es) & EXTENT_STATUS_UNWRITTEN) != 0; } static inline int ext4_es_is_delayed(struct extent_status *es) { - return (es->es_pblk & ES_DELAYED) != 0; + return (ext4_es_status(es) & EXTENT_STATUS_DELAYED) != 0; } static inline int ext4_es_is_hole(struct extent_status *es) { - return (es->es_pblk & ES_HOLE) != 0; -} - -static inline unsigned int ext4_es_status(struct extent_status *es) -{ - return es->es_pblk >> ES_SHIFT; + return (ext4_es_status(es) & EXTENT_STATUS_HOLE) != 0; } static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es) @@ -134,18 +130,16 @@ static inline void ext4_es_store_pblock(struct extent_status *es, static inline void ext4_es_store_status(struct extent_status *es, unsigned int status) { - es->es_pblk = (((ext4_fsblk_t) - (status & EXTENT_STATUS_FLAGS) << ES_SHIFT) | - (es->es_pblk & ~ES_MASK)); + es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) | + (es->es_pblk & ~ES_MASK); } static inline void ext4_es_store_pblock_status(struct extent_status *es, ext4_fsblk_t pb, unsigned int status) { - es->es_pblk = (((ext4_fsblk_t) - (status & EXTENT_STATUS_FLAGS) << ES_SHIFT) | - (pb & ~ES_MASK)); + es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) | + (pb & ~ES_MASK); } extern int ext4_es_register_shrinker(struct ext4_sb_info *sbi); |