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libceph: create source file "net/ceph/snapshot.c"

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This creates a new source file "net/ceph/snapshot.c" to contain
utility routines related to ceph snapshot contexts.  The main
motivation was to define ceph_create_snap_context() as a common way
to create these structures, but I've moved the definitions of
ceph_get_snap_context() and ceph_put_snap_context() there too.
(The benefit of inlining those is very small, and I'd rather
keep this collection of functions together.)

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder
2013-04-30 00:44:32 -05:00
committed by Sage Weil
parent b536f69a3a
commit 4f0dcb10cf
3 changed files with 84 additions and 26 deletions
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30
include/linux/ceph/libceph.h
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@@ -157,31 +157,11 @@ struct ceph_snap_context {
u64 snaps[];
};
static inline struct ceph_snap_context *
ceph_get_snap_context(struct ceph_snap_context *sc)
{
/*
printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
atomic_read(&sc->nref)+1);
*/
if (sc)
atomic_inc(&sc->nref);
return sc;
}
static inline void ceph_put_snap_context(struct ceph_snap_context *sc)
{
if (!sc)
return;
/*
printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
atomic_read(&sc->nref)-1);
*/
if (atomic_dec_and_test(&sc->nref)) {
/*printk(" deleting snap_context %p\n", sc);*/
kfree(sc);
}
}
extern struct ceph_snap_context *ceph_create_snap_context(u32 snap_count,
gfp_t gfp_flags);
extern struct ceph_snap_context *ceph_get_snap_context(
struct ceph_snap_context *sc);
extern void ceph_put_snap_context(struct ceph_snap_context *sc);
/*
* calculate the number of pages a given length and offset map onto,