ipc: standardize code comments
IPC commenting style is all over the place, *specially* in util.c. This patch orders things a bit. Signed-off-by: Davidlohr Bueso <davidlohr@hp.com> Cc: Aswin Chandramouleeswaran <aswin@hp.com> Cc: Rik van Riel <riel@redhat.com> Acked-by: Manfred Spraul <manfred@colorfullife.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Davidlohr Bueso
Linus Torvalds
Родитель
239521f31d
Коммит
8001c85810
24
ipc/sem.c
24
ipc/sem.c
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@ -225,7 +225,7 @@ static void unmerge_queues(struct sem_array *sma)
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}
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/**
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* merge_queues - Merge single semop queues into global queue
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* merge_queues - merge single semop queues into global queue
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* @sma: semaphore array
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*
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* This function merges all per-semaphore queues into the global queue.
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@ -474,7 +474,6 @@ static inline void sem_rmid(struct ipc_namespace *ns, struct sem_array *s)
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*
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* Called with sem_ids.rwsem held (as a writer)
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*/
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static int newary(struct ipc_namespace *ns, struct ipc_params *params)
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{
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int id;
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@ -682,7 +681,7 @@ static void wake_up_sem_queue_prepare(struct list_head *pt,
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}
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/**
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* wake_up_sem_queue_do(pt) - do the actual wake-up
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* wake_up_sem_queue_do - do the actual wake-up
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* @pt: list of tasks to be woken up
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*
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* Do the actual wake-up.
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@ -748,7 +747,7 @@ static int check_restart(struct sem_array *sma, struct sem_queue *q)
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}
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/**
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* wake_const_ops(sma, semnum, pt) - Wake up non-alter tasks
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* wake_const_ops - wake up non-alter tasks
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* @sma: semaphore array.
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* @semnum: semaphore that was modified.
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* @pt: list head for the tasks that must be woken up.
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@ -798,15 +797,14 @@ static int wake_const_ops(struct sem_array *sma, int semnum,
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}
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/**
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* do_smart_wakeup_zero(sma, sops, nsops, pt) - wakeup all wait for zero tasks
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* do_smart_wakeup_zero - wakeup all wait for zero tasks
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* @sma: semaphore array
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* @sops: operations that were performed
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* @nsops: number of operations
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* @pt: list head of the tasks that must be woken up.
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*
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* do_smart_wakeup_zero() checks all required queue for wait-for-zero
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* operations, based on the actual changes that were performed on the
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* semaphore array.
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* Checks all required queue for wait-for-zero operations, based
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* on the actual changes that were performed on the semaphore array.
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* The function returns 1 if at least one operation was completed successfully.
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*/
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static int do_smart_wakeup_zero(struct sem_array *sma, struct sembuf *sops,
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@ -850,7 +848,7 @@ static int do_smart_wakeup_zero(struct sem_array *sma, struct sembuf *sops,
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/**
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* update_queue(sma, semnum): Look for tasks that can be completed.
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* update_queue - look for tasks that can be completed.
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* @sma: semaphore array.
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* @semnum: semaphore that was modified.
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* @pt: list head for the tasks that must be woken up.
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@ -920,7 +918,7 @@ again:
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}
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/**
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* set_semotime(sma, sops) - set sem_otime
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* set_semotime - set sem_otime
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* @sma: semaphore array
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* @sops: operations that modified the array, may be NULL
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*
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@ -938,7 +936,7 @@ static void set_semotime(struct sem_array *sma, struct sembuf *sops)
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}
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/**
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* do_smart_update(sma, sops, nsops, otime, pt) - optimized update_queue
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* do_smart_update - optimized update_queue
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* @sma: semaphore array
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* @sops: operations that were performed
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* @nsops: number of operations
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@ -1647,7 +1645,7 @@ static struct sem_undo *lookup_undo(struct sem_undo_list *ulp, int semid)
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}
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/**
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* find_alloc_undo - Lookup (and if not present create) undo array
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* find_alloc_undo - lookup (and if not present create) undo array
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* @ns: namespace
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* @semid: semaphore array id
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*
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@ -1737,7 +1735,7 @@ out:
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/**
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* get_queue_result - Retrieve the result code from sem_queue
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* get_queue_result - retrieve the result code from sem_queue
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* @q: Pointer to queue structure
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*
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* Retrieve the return code from the pending queue. If IN_WAKEUP is found in
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@ -477,7 +477,6 @@ static const struct vm_operations_struct shm_vm_ops = {
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*
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* Called with shm_ids.rwsem held as a writer.
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*/
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static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
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{
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key_t key = params->key;
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233
ipc/util.c
233
ipc/util.c
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@ -110,15 +110,15 @@ static struct notifier_block ipc_memory_nb = {
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};
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/**
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* ipc_init - initialise IPC subsystem
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* ipc_init - initialise ipc subsystem
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*
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* The various system5 IPC resources (semaphores, messages and shared
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* memory) are initialised
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* A callback routine is registered into the memory hotplug notifier
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* chain: since msgmni scales to lowmem this callback routine will be
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* called upon successful memory add / remove to recompute msmgni.
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* The various sysv ipc resources (semaphores, messages and shared
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* memory) are initialised.
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*
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* A callback routine is registered into the memory hotplug notifier
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* chain: since msgmni scales to lowmem this callback routine will be
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* called upon successful memory add / remove to recompute msmgni.
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*/
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static int __init ipc_init(void)
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{
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sem_init();
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@ -131,13 +131,12 @@ static int __init ipc_init(void)
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__initcall(ipc_init);
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/**
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* ipc_init_ids - initialise IPC identifiers
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* @ids: Identifier set
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* ipc_init_ids - initialise ipc identifiers
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* @ids: ipc identifier set
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*
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* Set up the sequence range to use for the ipc identifier range (limited
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* below IPCMNI) then initialise the ids idr.
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* Set up the sequence range to use for the ipc identifier range (limited
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* below IPCMNI) then initialise the ids idr.
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*/
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void ipc_init_ids(struct ipc_ids *ids)
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{
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init_rwsem(&ids->rwsem);
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@ -159,11 +158,11 @@ void ipc_init_ids(struct ipc_ids *ids)
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#ifdef CONFIG_PROC_FS
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static const struct file_operations sysvipc_proc_fops;
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/**
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* ipc_init_proc_interface - Create a proc interface for sysipc types using a seq_file interface.
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* @path: Path in procfs
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* @header: Banner to be printed at the beginning of the file.
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* @ids: ipc id table to iterate.
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* @show: show routine.
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* ipc_init_proc_interface - create a proc interface for sysipc types using a seq_file interface.
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* @path: Path in procfs
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* @header: Banner to be printed at the beginning of the file.
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* @ids: ipc id table to iterate.
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* @show: show routine.
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*/
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void __init ipc_init_proc_interface(const char *path, const char *header,
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int ids, int (*show)(struct seq_file *, void *))
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@ -191,16 +190,15 @@ void __init ipc_init_proc_interface(const char *path, const char *header,
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#endif
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/**
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* ipc_findkey - find a key in an ipc identifier set
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* @ids: Identifier set
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* @key: The key to find
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* ipc_findkey - find a key in an ipc identifier set
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* @ids: ipc identifier set
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* @key: key to find
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*
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* Requires ipc_ids.rwsem locked.
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* Returns the LOCKED pointer to the ipc structure if found or NULL
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* if not.
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* If key is found ipc points to the owning ipc structure
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* Returns the locked pointer to the ipc structure if found or NULL
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* otherwise. If key is found ipc points to the owning ipc structure
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*
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* Called with ipc_ids.rwsem held.
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*/
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static struct kern_ipc_perm *ipc_findkey(struct ipc_ids *ids, key_t key)
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{
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struct kern_ipc_perm *ipc;
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@ -227,12 +225,11 @@ static struct kern_ipc_perm *ipc_findkey(struct ipc_ids *ids, key_t key)
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}
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/**
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* ipc_get_maxid - get the last assigned id
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* @ids: IPC identifier set
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* ipc_get_maxid - get the last assigned id
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* @ids: ipc identifier set
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*
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* Called with ipc_ids.rwsem held.
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* Called with ipc_ids.rwsem held.
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*/
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int ipc_get_maxid(struct ipc_ids *ids)
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{
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struct kern_ipc_perm *ipc;
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@ -258,17 +255,17 @@ int ipc_get_maxid(struct ipc_ids *ids)
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}
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/**
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* ipc_addid - add an IPC identifier
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* @ids: IPC identifier set
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* @new: new IPC permission set
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* @size: limit for the number of used ids
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* ipc_addid - add an ipc identifier
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* @ids: ipc identifier set
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* @new: new ipc permission set
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* @size: limit for the number of used ids
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*
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* Add an entry 'new' to the IPC ids idr. The permissions object is
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* initialised and the first free entry is set up and the id assigned
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* is returned. The 'new' entry is returned in a locked state on success.
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* On failure the entry is not locked and a negative err-code is returned.
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* Add an entry 'new' to the ipc ids idr. The permissions object is
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* initialised and the first free entry is set up and the id assigned
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* is returned. The 'new' entry is returned in a locked state on success.
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* On failure the entry is not locked and a negative err-code is returned.
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*
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* Called with writer ipc_ids.rwsem held.
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* Called with writer ipc_ids.rwsem held.
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*/
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int ipc_addid(struct ipc_ids *ids, struct kern_ipc_perm *new, int size)
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{
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@ -320,14 +317,14 @@ int ipc_addid(struct ipc_ids *ids, struct kern_ipc_perm *new, int size)
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}
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/**
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* ipcget_new - create a new ipc object
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* @ns: namespace
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* @ids: IPC identifer set
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* @ops: the actual creation routine to call
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* @params: its parameters
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* ipcget_new - create a new ipc object
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* @ns: ipc namespace
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* @ids: ipc identifer set
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* @ops: the actual creation routine to call
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* @params: its parameters
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*
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* This routine is called by sys_msgget, sys_semget() and sys_shmget()
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* when the key is IPC_PRIVATE.
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* This routine is called by sys_msgget, sys_semget() and sys_shmget()
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* when the key is IPC_PRIVATE.
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*/
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static int ipcget_new(struct ipc_namespace *ns, struct ipc_ids *ids,
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struct ipc_ops *ops, struct ipc_params *params)
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@ -341,19 +338,19 @@ static int ipcget_new(struct ipc_namespace *ns, struct ipc_ids *ids,
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}
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/**
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* ipc_check_perms - check security and permissions for an IPC
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* @ns: IPC namespace
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* @ipcp: ipc permission set
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* @ops: the actual security routine to call
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* @params: its parameters
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* ipc_check_perms - check security and permissions for an ipc object
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* @ns: ipc namespace
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* @ipcp: ipc permission set
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* @ops: the actual security routine to call
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* @params: its parameters
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*
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* This routine is called by sys_msgget(), sys_semget() and sys_shmget()
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* when the key is not IPC_PRIVATE and that key already exists in the
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* ids IDR.
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* This routine is called by sys_msgget(), sys_semget() and sys_shmget()
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* when the key is not IPC_PRIVATE and that key already exists in the
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* ds IDR.
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*
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* On success, the IPC id is returned.
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* On success, the ipc id is returned.
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*
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* It is called with ipc_ids.rwsem and ipcp->lock held.
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* It is called with ipc_ids.rwsem and ipcp->lock held.
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*/
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static int ipc_check_perms(struct ipc_namespace *ns,
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struct kern_ipc_perm *ipcp,
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@ -374,18 +371,18 @@ static int ipc_check_perms(struct ipc_namespace *ns,
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}
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/**
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* ipcget_public - get an ipc object or create a new one
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* @ns: namespace
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* @ids: IPC identifer set
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* @ops: the actual creation routine to call
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* @params: its parameters
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* ipcget_public - get an ipc object or create a new one
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* @ns: ipc namespace
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* @ids: ipc identifer set
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* @ops: the actual creation routine to call
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* @params: its parameters
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*
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* This routine is called by sys_msgget, sys_semget() and sys_shmget()
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* when the key is not IPC_PRIVATE.
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* It adds a new entry if the key is not found and does some permission
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* / security checkings if the key is found.
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* This routine is called by sys_msgget, sys_semget() and sys_shmget()
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* when the key is not IPC_PRIVATE.
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* It adds a new entry if the key is not found and does some permission
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* / security checkings if the key is found.
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*
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* On success, the ipc id is returned.
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* On success, the ipc id is returned.
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*/
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static int ipcget_public(struct ipc_namespace *ns, struct ipc_ids *ids,
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struct ipc_ops *ops, struct ipc_params *params)
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@ -431,14 +428,13 @@ static int ipcget_public(struct ipc_namespace *ns, struct ipc_ids *ids,
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/**
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* ipc_rmid - remove an IPC identifier
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* @ids: IPC identifier set
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* @ipcp: ipc perm structure containing the identifier to remove
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* ipc_rmid - remove an ipc identifier
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* @ids: ipc identifier set
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* @ipcp: ipc perm structure containing the identifier to remove
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*
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* ipc_ids.rwsem (as a writer) and the spinlock for this ID are held
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* before this function is called, and remain locked on the exit.
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* ipc_ids.rwsem (as a writer) and the spinlock for this ID are held
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* before this function is called, and remain locked on the exit.
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*/
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void ipc_rmid(struct ipc_ids *ids, struct kern_ipc_perm *ipcp)
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{
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int lid = ipcid_to_idx(ipcp->id);
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@ -453,13 +449,12 @@ void ipc_rmid(struct ipc_ids *ids, struct kern_ipc_perm *ipcp)
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}
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/**
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* ipc_alloc - allocate ipc space
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* @size: size desired
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* ipc_alloc - allocate ipc space
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* @size: size desired
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*
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* Allocate memory from the appropriate pools and return a pointer to it.
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* NULL is returned if the allocation fails
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* Allocate memory from the appropriate pools and return a pointer to it.
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* NULL is returned if the allocation fails
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*/
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void *ipc_alloc(int size)
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{
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void *out;
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@ -471,14 +466,13 @@ void *ipc_alloc(int size)
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}
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/**
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* ipc_free - free ipc space
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* @ptr: pointer returned by ipc_alloc
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* @size: size of block
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* ipc_free - free ipc space
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* @ptr: pointer returned by ipc_alloc
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* @size: size of block
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*
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* Free a block created with ipc_alloc(). The caller must know the size
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* used in the allocation call.
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* Free a block created with ipc_alloc(). The caller must know the size
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* used in the allocation call.
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*/
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void ipc_free(void *ptr, int size)
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{
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if (size > PAGE_SIZE)
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@ -488,11 +482,11 @@ void ipc_free(void *ptr, int size)
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}
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/**
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* ipc_rcu_alloc - allocate ipc and rcu space
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* @size: size desired
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* ipc_rcu_alloc - allocate ipc and rcu space
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* @size: size desired
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*
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* Allocate memory for the rcu header structure + the object.
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* Returns the pointer to the object or NULL upon failure.
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* Allocate memory for the rcu header structure + the object.
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* Returns the pointer to the object or NULL upon failure.
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*/
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void *ipc_rcu_alloc(int size)
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{
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@ -534,17 +528,16 @@ void ipc_rcu_free(struct rcu_head *head)
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}
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/**
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* ipcperms - check IPC permissions
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* @ns: IPC namespace
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* @ipcp: IPC permission set
|
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* @flag: desired permission set.
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* ipcperms - check ipc permissions
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* @ns: ipc namespace
|
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* @ipcp: ipc permission set
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* @flag: desired permission set
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*
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* Check user, group, other permissions for access
|
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* to ipc resources. return 0 if allowed
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* Check user, group, other permissions for access
|
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* to ipc resources. return 0 if allowed
|
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*
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* @flag will most probably be 0 or S_...UGO from <linux/stat.h>
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* @flag will most probably be 0 or S_...UGO from <linux/stat.h>
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*/
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int ipcperms(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp, short flag)
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{
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kuid_t euid = current_euid();
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|
|
@ -572,15 +565,13 @@ int ipcperms(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp, short flag)
|
|||
*/
|
||||
|
||||
/**
|
||||
* kernel_to_ipc64_perm - convert kernel ipc permissions to user
|
||||
* @in: kernel permissions
|
||||
* @out: new style IPC permissions
|
||||
* kernel_to_ipc64_perm - convert kernel ipc permissions to user
|
||||
* @in: kernel permissions
|
||||
* @out: new style ipc permissions
|
||||
*
|
||||
* Turn the kernel object @in into a set of permissions descriptions
|
||||
* for returning to userspace (@out).
|
||||
* Turn the kernel object @in into a set of permissions descriptions
|
||||
* for returning to userspace (@out).
|
||||
*/
|
||||
|
||||
|
||||
void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out)
|
||||
{
|
||||
out->key = in->key;
|
||||
|
|
@ -593,14 +584,13 @@ void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out)
|
|||
}
|
||||
|
||||
/**
|
||||
* ipc64_perm_to_ipc_perm - convert new ipc permissions to old
|
||||
* @in: new style IPC permissions
|
||||
* @out: old style IPC permissions
|
||||
* ipc64_perm_to_ipc_perm - convert new ipc permissions to old
|
||||
* @in: new style ipc permissions
|
||||
* @out: old style ipc permissions
|
||||
*
|
||||
* Turn the new style permissions object @in into a compatibility
|
||||
* object and store it into the @out pointer.
|
||||
* Turn the new style permissions object @in into a compatibility
|
||||
* object and store it into the @out pointer.
|
||||
*/
|
||||
|
||||
void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out)
|
||||
{
|
||||
out->key = in->key;
|
||||
|
|
@ -635,8 +625,8 @@ struct kern_ipc_perm *ipc_obtain_object(struct ipc_ids *ids, int id)
|
|||
}
|
||||
|
||||
/**
|
||||
* ipc_lock - Lock an ipc structure without rwsem held
|
||||
* @ids: IPC identifier set
|
||||
* ipc_lock - lock an ipc structure without rwsem held
|
||||
* @ids: ipc identifier set
|
||||
* @id: ipc id to look for
|
||||
*
|
||||
* Look for an id in the ipc ids idr and lock the associated ipc object.
|
||||
|
|
@ -693,11 +683,11 @@ out:
|
|||
|
||||
/**
|
||||
* ipcget - Common sys_*get() code
|
||||
* @ns : namsepace
|
||||
* @ids : IPC identifier set
|
||||
* @ops : operations to be called on ipc object creation, permission checks
|
||||
* and further checks
|
||||
* @params : the parameters needed by the previous operations.
|
||||
* @ns: namsepace
|
||||
* @ids: ipc identifier set
|
||||
* @ops: operations to be called on ipc object creation, permission checks
|
||||
* and further checks
|
||||
* @params: the parameters needed by the previous operations.
|
||||
*
|
||||
* Common routine called by sys_msgget(), sys_semget() and sys_shmget().
|
||||
*/
|
||||
|
|
@ -711,7 +701,7 @@ int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,
|
|||
}
|
||||
|
||||
/**
|
||||
* ipc_update_perm - update the permissions of an IPC.
|
||||
* ipc_update_perm - update the permissions of an ipc object
|
||||
* @in: the permission given as input.
|
||||
* @out: the permission of the ipc to set.
|
||||
*/
|
||||
|
|
@ -732,7 +722,7 @@ int ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out)
|
|||
|
||||
/**
|
||||
* ipcctl_pre_down_nolock - retrieve an ipc and check permissions for some IPC_XXX cmd
|
||||
* @ns: the ipc namespace
|
||||
* @ns: ipc namespace
|
||||
* @ids: the table of ids where to look for the ipc
|
||||
* @id: the id of the ipc to retrieve
|
||||
* @cmd: the cmd to check
|
||||
|
|
@ -779,14 +769,13 @@ err:
|
|||
|
||||
|
||||
/**
|
||||
* ipc_parse_version - IPC call version
|
||||
* @cmd: pointer to command
|
||||
* ipc_parse_version - ipc call version
|
||||
* @cmd: pointer to command
|
||||
*
|
||||
* Return IPC_64 for new style IPC and IPC_OLD for old style IPC.
|
||||
* The @cmd value is turned from an encoding command and version into
|
||||
* just the command code.
|
||||
* Return IPC_64 for new style IPC and IPC_OLD for old style IPC.
|
||||
* The @cmd value is turned from an encoding command and version into
|
||||
* just the command code.
|
||||
*/
|
||||
|
||||
int ipc_parse_version(int *cmd)
|
||||
{
|
||||
if (*cmd & IPC_64) {
|
||||
|
|
|
|||
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