ipc_rmid – remove an ipc identifier Synopsis void ipc_rmid(struct ipc_ids *ids, struct kern_ipc_perm *ipcp); Arguments ids ipc identifier set ipcp ipc perm structure containing the identifier to remove Description ipc_ids.rwsem (as a writer) and the spinlock for this ID are held before this function is called, and remain locked on the exit. Copyright
ipc_rcu_alloc – allocate ipc and rcu space Synopsis void *ipc_rcu_alloc(int size); Arguments size size desired Description Allocate memory for the rcu header structure + the object. Returns the pointer to the object or NULL upon failure. Copyright
ipc_parse_version – ipc call version Synopsis int ipc_parse_version(int *cmd); Arguments cmd pointer to command Description 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. Copyright
ipc_obtain_object_idr – Synopsis struct kern_ipc_perm *ipc_obtain_object_idr(struct ipc_ids *ids, int id); Arguments ids ipc identifier set id ipc id to look for Description Look for an id in the ipc ids idr and return associated ipc object. Call inside the RCU critical section. The ipc object is *not* locked on exit. Copyright
ipc_obtain_object_check – Synopsis struct kern_ipc_perm *ipc_obtain_object_check(struct ipc_ids *ids, int id); Arguments ids ipc identifier set id ipc id to look for Description Similar to ipc_obtain_object_idr but also checks the ipc object reference counter. Call inside the RCU critical section. The ipc object is *not* locked on exit. Copyright
ipc_lock – lock an ipc structure without rwsem held Synopsis struct kern_ipc_perm *ipc_lock(struct ipc_ids *ids, int id); Arguments ids ipc identifier set id ipc id to look for Description Look for an id in the ipc ids idr and lock the associated ipc object. The ipc object is locked on successful exit. Copyright
ipc_init_proc_interface – create a proc interface for sysipc types using a seq_file interface. Synopsis void ipc_init_proc_interface(const char *path, const char *header, int ids, int (*show)(struct seq_file *, void *)); Arguments path Path in procfs header Banner to be printed at the beginning of the file. ids ipc id table to iterate. show show routine. Copyright
ipc_init_ids – initialise ipc identifiers Synopsis void ipc_init_ids(struct ipc_ids *ids); Arguments ids ipc identifier set Description Set up the sequence range to use for the ipc identifier range (limited below IPCMNI) then initialise the ids idr. Copyright
ipc_init – initialise ipc subsystem Synopsis int ipc_init(void); Arguments void no arguments Description The various sysv ipc resources (semaphores, messages and shared memory) are initialised. A callback routine is registered into the memory hotplug notifier chain: since msgmni scales to lowmem this callback routine will be called upon successful memory add / remove to recompute…
ipc_get_maxid – get the last assigned id Synopsis int ipc_get_maxid(struct ipc_ids *ids); Arguments ids ipc identifier set Description Called with ipc_ids.rwsem held. Copyright
ipc_free – free ipc space Synopsis void ipc_free(void *ptr); Arguments ptr pointer returned by ipc_alloc Description Free a block created with ipc_alloc. Copyright
ipc_findkey – find a key in an ipc identifier set Synopsis struct kern_ipc_perm *ipc_findkey(struct ipc_ids *ids, key_t key); Arguments ids ipc identifier set key key to find Description Returns the locked pointer to the ipc structure if found or NULL otherwise. If key is found ipc points to the owning ipc structure Called with ipc_ids.rwsem…
ipc_check_perms – check security and permissions for an ipc object Synopsis int ipc_check_perms(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp, const struct ipc_ops *ops, struct ipc_params *params); Arguments ns ipc namespace ipcp ipc permission set ops the actual security routine to call params its parameters Description This routine is called by sys_msgget, sys_semget and sys_shmget when the…
ipc_alloc – allocate ipc space Synopsis void *ipc_alloc(int size); Arguments size size desired Description Allocate memory from the appropriate pools and return a pointer to it. NULL is returned if the allocation fails Copyright
ipc_addid – add an ipc identifier Synopsis int ipc_addid(struct ipc_ids *ids, struct kern_ipc_perm *new, int size); Arguments ids ipc identifier set new new ipc permission set size limit for the number of used ids Description Add an entry ‘new’ to the ipc ids idr. The permissions object is initialised and the first free entry is…
ipc64_perm_to_ipc_perm – convert new ipc permissions to old Synopsis void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out); Arguments in new style ipc permissions out old style ipc permissions Description Turn the new style permissions object in into a compatibility object and store it into the out pointer. Copyright
ioremap_nocache – map bus memory into CPU space Synopsis void __iomem *ioremap_nocache(resource_size_t offset, unsigned long size); Arguments offset bus address of the memory size size of the resource to map Description ioremap performs a platform specific sequence of operations to make bus memory CPU accessible via the readb/readw/readl/writeb/ writew/writel functions and the other mmio helpers….
invalidate_mapping_pages – Invalidate all the unlocked pages of one inode Synopsis unsigned long invalidate_mapping_pages(struct address_space *mapping, pgoff_t start, pgoff_t end); Arguments mapping the address_space which holds the pages to invalidate start the offset ‘from’ which to invalidate end the offset ‘to’ which to invalidate (inclusive) Description This function only removes the unlocked pages, if you…
invalidate_inode_pages2_range – remove range of pages from an address_space Synopsis int invalidate_inode_pages2_range(struct address_space *mapping, pgoff_t start, pgoff_t end); Arguments mapping the address_space start the page offset ‘from’ which to invalidate end the page offset ‘to’ which to invalidate (inclusive) Description Any pages which are found to be mapped into pagetables are unmapped prior to invalidation….
invalidate_inode_pages2 – remove all pages from an address_space Synopsis int invalidate_inode_pages2(struct address_space *mapping); Arguments mapping the address_space Description Any pages which are found to be mapped into pagetables are unmapped prior to invalidation. Returns -EBUSY if any pages could not be invalidated. Copyright