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nilfs2: add struct nilfs_suinfo_update and flags

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Add the nilfs_suinfo_update structure, which contains the information
needed to update one segment usage entry.  The flags specify, which
fields need to be updated.

Signed-off-by: Andreas Rohner <andreas.rohner@gmx.net>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andreas Rohner 2014-04-03 14:50:26 -07:00 committed by Linus Torvalds
parent e21269355e
commit 90ccf7dde9
1 changed files with 42 additions and 0 deletions
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42
include/linux/nilfs2_fs.h
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@ -710,6 +710,48 @@ static inline int nilfs_suinfo_clean(const struct nilfs_suinfo *si)
}
/* ioctl */
/**
* nilfs_suinfo_update - segment usage information update
* @sup_segnum: segment number
* @sup_flags: flags for which fields are active in sup_sui
* @sup_reserved: reserved necessary for alignment
* @sup_sui: segment usage information
*/
struct nilfs_suinfo_update {
__u64 sup_segnum;
__u32 sup_flags;
__u32 sup_reserved;
struct nilfs_suinfo sup_sui;
};
enum {
NILFS_SUINFO_UPDATE_LASTMOD,
NILFS_SUINFO_UPDATE_NBLOCKS,
NILFS_SUINFO_UPDATE_FLAGS,
__NR_NILFS_SUINFO_UPDATE_FIELDS,
};
#define NILFS_SUINFO_UPDATE_FNS(flag, name) \
static inline void \
nilfs_suinfo_update_set_##name(struct nilfs_suinfo_update *sup) \
{ \
sup->sup_flags |= 1UL << NILFS_SUINFO_UPDATE_##flag; \
} \
static inline void \
nilfs_suinfo_update_clear_##name(struct nilfs_suinfo_update *sup) \
{ \
sup->sup_flags &= ~(1UL << NILFS_SUINFO_UPDATE_##flag); \
} \
static inline int \
nilfs_suinfo_update_##name(const struct nilfs_suinfo_update *sup) \
{ \
return !!(sup->sup_flags & (1UL << NILFS_SUINFO_UPDATE_##flag));\
}
NILFS_SUINFO_UPDATE_FNS(LASTMOD, lastmod)
NILFS_SUINFO_UPDATE_FNS(NBLOCKS, nblocks)
NILFS_SUINFO_UPDATE_FNS(FLAGS, flags)
enum {
NILFS_CHECKPOINT,
NILFS_SNAPSHOT,