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Linux 4.11 compat: avoid refcount_t name conflict 

Linux 4.11 introduces a new type, refcount_t, which conflicts with the
type of the same name defined within ZFS.

Rename the ZFS type zfs_refcount_t.  Within the ZFS code, use a macro to
cause references to refcount_t to be changed to zfs_refcount_t at
compile time.  This reduces conflicts when later landing OpenZFS
patches.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Olaf Faaland <faaland1@llnl.gov>
Closes #5823 
Closes #5842
This commit is contained in:
Olaf Faaland 2017-02-28 16:10:18 -08:00 committed by Brian Behlendorf
parent 912e2ba92f
commit 4859fe796c
2 changed files with 15 additions and 4 deletions
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17
include/sys/refcount.h
View File

@ -41,6 +41,17 @@ extern "C" {
*/
#define FTAG ((char *)__func__)
/*
* Starting with 4.11, torvalds/linux@f405df5, the linux kernel defines a
* refcount_t type of its own. The macro below effectively changes references
* in the ZFS code from refcount_t to zfs_refcount_t at compile time, so that
* existing code need not be altered, reducing conflicts when landing openZFS
* patches.
*/
#define refcount_t zfs_refcount_t
#define refcount_add zfs_refcount_add
#ifdef ZFS_DEBUG
typedef struct reference {
list_node_t ref_link;
@ -56,7 +67,7 @@ typedef struct refcount {
list_t rc_removed;
uint64_t rc_count;
uint64_t rc_removed_count;
} refcount_t;
} zfs_refcount_t;
/* Note: refcount_t must be initialized with refcount_create[_untracked]() */
@ -67,7 +78,7 @@ void refcount_destroy(refcount_t *rc);
void refcount_destroy_many(refcount_t *rc, uint64_t number);
int refcount_is_zero(refcount_t *rc);
int64_t refcount_count(refcount_t *rc);
int64_t refcount_add(refcount_t *rc, void *holder_tag);
int64_t zfs_refcount_add(refcount_t *rc, void *holder_tag);
int64_t refcount_remove(refcount_t *rc, void *holder_tag);
int64_t refcount_add_many(refcount_t *rc, uint64_t number, void *holder_tag);
int64_t refcount_remove_many(refcount_t *rc, uint64_t number, void *holder_tag);
@ -92,7 +103,7 @@ typedef struct refcount {
#define refcount_destroy_many(rc, number) ((rc)->rc_count = 0)
#define refcount_is_zero(rc) ((rc)->rc_count == 0)
#define refcount_count(rc) ((rc)->rc_count)
#define refcount_add(rc, holder) atomic_inc_64_nv(&(rc)->rc_count)
#define zfs_refcount_add(rc, holder) atomic_inc_64_nv(&(rc)->rc_count)
#define refcount_remove(rc, holder) atomic_dec_64_nv(&(rc)->rc_count)
#define refcount_add_many(rc, number, holder) \
atomic_add_64_nv(&(rc)->rc_count, number)

2
module/zfs/refcount.c
View File

@ -143,7 +143,7 @@ refcount_add_many(refcount_t *rc, uint64_t number, void *holder)
}
int64_t
refcount_add(refcount_t *rc, void *holder)
zfs_refcount_add(refcount_t *rc, void *holder)
{
return (refcount_add_many(rc, 1, holder));
}