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ipc: rename ids->rw_mutex

Browse source 
Since in some situations the lock can be shared for readers, we shouldn't
be calling it a mutex, rename it to rwsem.

Signed-off-by: Davidlohr Bueso <[email protected]>
Tested-by: Sedat Dilek <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Manfred Spraul <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Davidlohr Bueso 2013-09-11 14:26:24 -07:00 • committed by Linus Torvalds
commit d9a605e40b
7 changed files with 69 additions and 69 deletions
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56
ipc/shm.c
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@ -83,8 +83,8 @@ void shm_init_ns(struct ipc_namespace *ns)
}
/*
* Called with shm_ids.rw_mutex (writer) and the shp structure locked.
* Only shm_ids.rw_mutex remains locked on exit.
* Called with shm_ids.rwsem (writer) and the shp structure locked.
* Only shm_ids.rwsem remains locked on exit.
*/
static void do_shm_rmid(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp)
{
@ -148,7 +148,7 @@ static inline struct shmid_kernel *shm_obtain_object_check(struct ipc_namespace
}
/*
* shm_lock_(check_) routines are called in the paths where the rw_mutex
* shm_lock_(check_) routines are called in the paths where the rwsem
* is not necessarily held.
*/
static inline struct shmid_kernel *shm_lock(struct ipc_namespace *ns, int id)
@ -205,7 +205,7 @@ static void shm_open(struct vm_area_struct *vma)
* @ns: namespace
* @shp: struct to free
*
* It has to be called with shp and shm_ids.rw_mutex (writer) locked,
* It has to be called with shp and shm_ids.rwsem (writer) locked,
* but returns with shp unlocked and freed.
*/
static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp)
@ -253,7 +253,7 @@ static void shm_close(struct vm_area_struct *vma)
struct shmid_kernel *shp;
struct ipc_namespace *ns = sfd->ns;
down_write(&shm_ids(ns).rw_mutex);
down_write(&shm_ids(ns).rwsem);
/* remove from the list of attaches of the shm segment */
shp = shm_lock(ns, sfd->id);
BUG_ON(IS_ERR(shp));
@ -264,10 +264,10 @@ static void shm_close(struct vm_area_struct *vma)
shm_destroy(ns, shp);
else
shm_unlock(shp);
up_write(&shm_ids(ns).rw_mutex);
up_write(&shm_ids(ns).rwsem);
}
/* Called with ns->shm_ids(ns).rw_mutex locked */
/* Called with ns->shm_ids(ns).rwsem locked */
static int shm_try_destroy_current(int id, void *p, void *data)
{
struct ipc_namespace *ns = data;
@ -298,7 +298,7 @@ static int shm_try_destroy_current(int id, void *p, void *data)
return 0;
}
/* Called with ns->shm_ids(ns).rw_mutex locked */
/* Called with ns->shm_ids(ns).rwsem locked */
static int shm_try_destroy_orphaned(int id, void *p, void *data)
{
struct ipc_namespace *ns = data;
@ -309,7 +309,7 @@ static int shm_try_destroy_orphaned(int id, void *p, void *data)
* We want to destroy segments without users and with already
* exit'ed originating process.
*
* As shp->* are changed under rw_mutex, it's safe to skip shp locking.
* As shp->* are changed under rwsem, it's safe to skip shp locking.
*/
if (shp->shm_creator != NULL)
return 0;
@ -323,10 +323,10 @@ static int shm_try_destroy_orphaned(int id, void *p, void *data)
void shm_destroy_orphaned(struct ipc_namespace *ns)
{
down_write(&shm_ids(ns).rw_mutex);
down_write(&shm_ids(ns).rwsem);
if (shm_ids(ns).in_use)
idr_for_each(&shm_ids(ns).ipcs_idr, &shm_try_destroy_orphaned, ns);
up_write(&shm_ids(ns).rw_mutex);
up_write(&shm_ids(ns).rwsem);
}
@ -338,10 +338,10 @@ void exit_shm(struct task_struct *task)
return;
/* Destroy all already created segments, but not mapped yet */
down_write(&shm_ids(ns).rw_mutex);
down_write(&shm_ids(ns).rwsem);
if (shm_ids(ns).in_use)
idr_for_each(&shm_ids(ns).ipcs_idr, &shm_try_destroy_current, ns);
up_write(&shm_ids(ns).rw_mutex);
up_write(&shm_ids(ns).rwsem);
}
static int shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
@ -475,7 +475,7 @@ static const struct vm_operations_struct shm_vm_ops = {
* @ns: namespace
* @params: ptr to the structure that contains key, size and shmflg
*
* Called with shm_ids.rw_mutex held as a writer.
* Called with shm_ids.rwsem held as a writer.
*/
static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
@ -583,7 +583,7 @@ no_file:
}
/*
* Called with shm_ids.rw_mutex and ipcp locked.
* Called with shm_ids.rwsem and ipcp locked.
*/
static inline int shm_security(struct kern_ipc_perm *ipcp, int shmflg)
{
@ -594,7 +594,7 @@ static inline int shm_security(struct kern_ipc_perm *ipcp, int shmflg)
}
/*
* Called with shm_ids.rw_mutex and ipcp locked.
* Called with shm_ids.rwsem and ipcp locked.
*/
static inline int shm_more_checks(struct kern_ipc_perm *ipcp,
struct ipc_params *params)
@ -707,7 +707,7 @@ static inline unsigned long copy_shminfo_to_user(void __user *buf, struct shminf
/*
* Calculate and add used RSS and swap pages of a shm.
* Called with shm_ids.rw_mutex held as a reader
* Called with shm_ids.rwsem held as a reader
*/
static void shm_add_rss_swap(struct shmid_kernel *shp,
unsigned long *rss_add, unsigned long *swp_add)
@ -734,7 +734,7 @@ static void shm_add_rss_swap(struct shmid_kernel *shp,
}
/*
* Called with shm_ids.rw_mutex held as a reader
* Called with shm_ids.rwsem held as a reader
*/
static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss,
unsigned long *swp)
@ -763,9 +763,9 @@ static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss,
}
/*
* This function handles some shmctl commands which require the rw_mutex
* This function handles some shmctl commands which require the rwsem
* to be held in write mode.
* NOTE: no locks must be held, the rw_mutex is taken inside this function.
* NOTE: no locks must be held, the rwsem is taken inside this function.
*/
static int shmctl_down(struct ipc_namespace *ns, int shmid, int cmd,
struct shmid_ds __user *buf, int version)
@ -780,7 +780,7 @@ static int shmctl_down(struct ipc_namespace *ns, int shmid, int cmd,
return -EFAULT;
}
down_write(&shm_ids(ns).rw_mutex);
down_write(&shm_ids(ns).rwsem);
rcu_read_lock();
ipcp = ipcctl_pre_down_nolock(ns, &shm_ids(ns), shmid, cmd,
@ -819,7 +819,7 @@ out_unlock0:
out_unlock1:
rcu_read_unlock();
out_up:
up_write(&shm_ids(ns).rw_mutex);
up_write(&shm_ids(ns).rwsem);
return err;
}
@ -850,9 +850,9 @@ static int shmctl_nolock(struct ipc_namespace *ns, int shmid,
if(copy_shminfo_to_user (buf, &shminfo, version))
return -EFAULT;
down_read(&shm_ids(ns).rw_mutex);
down_read(&shm_ids(ns).rwsem);
err = ipc_get_maxid(&shm_ids(ns));
up_read(&shm_ids(ns).rw_mutex);
up_read(&shm_ids(ns).rwsem);
if(err<0)
err = 0;
@ -863,14 +863,14 @@ static int shmctl_nolock(struct ipc_namespace *ns, int shmid,
struct shm_info shm_info;
memset(&shm_info, 0, sizeof(shm_info));
down_read(&shm_ids(ns).rw_mutex);
down_read(&shm_ids(ns).rwsem);
shm_info.used_ids = shm_ids(ns).in_use;
shm_get_stat (ns, &shm_info.shm_rss, &shm_info.shm_swp);
shm_info.shm_tot = ns->shm_tot;
shm_info.swap_attempts = 0;
shm_info.swap_successes = 0;
err = ipc_get_maxid(&shm_ids(ns));
up_read(&shm_ids(ns).rw_mutex);
up_read(&shm_ids(ns).rwsem);
if (copy_to_user(buf, &shm_info, sizeof(shm_info))) {
err = -EFAULT;
goto out;
@ -1169,7 +1169,7 @@ out_fput:
fput(file);
out_nattch:
down_write(&shm_ids(ns).rw_mutex);
down_write(&shm_ids(ns).rwsem);
shp = shm_lock(ns, shmid);
BUG_ON(IS_ERR(shp));
shp->shm_nattch--;
@ -1177,7 +1177,7 @@ out_nattch:
shm_destroy(ns, shp);
else
shm_unlock(shp);
up_write(&shm_ids(ns).rw_mutex);
up_write(&shm_ids(ns).rwsem);
return err;
out_unlock: