kfifo_from_user – puts some data from user space into the fifo Synopsis kfifo_from_user(fifo, from, len, copied); Arguments fifo address of the fifo to be used from pointer to the data to be added len the length of the data to be added copied pointer to output variable to store the number of copied bytes Description…
kfifo_free – frees the fifo Synopsis kfifo_free(fifo); Arguments fifo the fifo to be freed Copyright
kfifo_esize – returns the size of the element managed by the fifo Synopsis kfifo_esize(fifo); Arguments fifo address of the fifo to be used Copyright
kfifo_dma_out_prepare – setup a scatterlist for DMA output Synopsis kfifo_dma_out_prepare(fifo, sgl, nents, len); Arguments fifo address of the fifo to be used sgl pointer to the scatterlist array nents number of entries in the scatterlist array len number of elements to transfer Description This macro fills a scatterlist for DMA output which at most len…
kfifo_dma_out_finish – finish a DMA OUT operation Synopsis kfifo_dma_out_finish(fifo, len); Arguments fifo address of the fifo to be used len number of bytes transferred Description This macro finish a DMA OUT operation. The out counter will be updated by the len parameter. No error checking will be done. Note that with only one concurrent reader…
kfifo_dma_in_prepare – setup a scatterlist for DMA input Synopsis kfifo_dma_in_prepare(fifo, sgl, nents, len); Arguments fifo address of the fifo to be used sgl pointer to the scatterlist array nents number of entries in the scatterlist array len number of elements to transfer Description This macro fills a scatterlist for DMA input. It returns the number…
kfifo_dma_in_finish – finish a DMA IN operation Synopsis kfifo_dma_in_finish(fifo, len); Arguments fifo address of the fifo to be used len number of bytes to received Description This macro finish a DMA IN operation. The in counter will be updated by the len parameter. No error checking will be done. Note that with only one concurrent…
kfifo_avail – returns the number of unused elements in the fifo Synopsis kfifo_avail(fifo); Arguments fifo address of the fifo to be used Copyright
kfifo_alloc – dynamically allocates a new fifo buffer Synopsis kfifo_alloc(fifo, size, gfp_mask); Arguments fifo pointer to the fifo size the number of elements in the fifo, this must be a power of 2 gfp_mask get_free_pages mask, passed to kmalloc Description This macro dynamically allocates a new fifo buffer. The numer of elements will be rounded-up…
kernel_to_ipc64_perm – convert kernel ipc permissions to user Synopsis void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out); Arguments in kernel permissions out new style ipc permissions Description Turn the kernel object in into a set of permissions descriptions for returning to userspace (out). Copyright
kernel_recvmsg – Receive a message from a socket (kernel space) Synopsis int kernel_recvmsg(struct socket *sock, struct msghdr *msg, struct kvec *vec, size_t num, size_t size, int flags); Arguments sock The socket to receive the message from msg Received message vec Input s/g array for message data num Size of input s/g array size Number of…
kcalloc – allocate memory for an array. The memory is set to zero. Synopsis void *kcalloc(size_t n, size_t size, gfp_t flags); Arguments n number of elements. size element size. flags the type of memory to allocate (see kmalloc). Copyright
jbd2_journal_wipe – Wipe journal contents Synopsis int jbd2_journal_wipe(journal_t *journal, int write); Arguments journal Journal to act on. write flag (see below) Description Wipe out all of the contents of a journal, safely. This will produce a warning if the journal contains any valid recovery information. Must be called between journal_init_*() and jbd2_journal_load. If ‘write’ is…
jbd2_journal_update_sb_errno – Update error in the journal. Synopsis void jbd2_journal_update_sb_errno(journal_t *journal); Arguments journal The journal to update. Description Update a journal’s errno. Write updated superblock to disk waiting for IO to complete. Authors Roger Gammans <rgammans [at] computer-surgery.co.uk> Author. Stephen Tweedie <sct [at] redhat.com> Author. Copyright
jbd2_journal_unlock_updates – release barrier Synopsis void jbd2_journal_unlock_updates(journal_t *journal); Arguments journal Journal to release the barrier on. Description Release a transaction barrier obtained with jbd2_journal_lock_updates. Should be called without the journal lock held. Authors Roger Gammans <rgammans [at] computer-surgery.co.uk> Author. Stephen Tweedie <sct [at] redhat.com> Author. Copyright
jbd2_journal_try_to_free_buffers – try to free page buffers. Synopsis int jbd2_journal_try_to_free_buffers(journal_t *journal, struct page *page, gfp_t gfp_mask); Arguments journal journal for operation page to try and free gfp_mask we use the mask to detect how hard should we try to release buffers. If __GFP_DIRECT_RECLAIM and __GFP_FS is set, we wait for commit code to release the…
jbd2_journal_stop – complete a transaction Synopsis int jbd2_journal_stop(handle_t *handle); Arguments handle transaction to complete. Description All done for a particular handle. There is not much action needed here. We just return any remaining buffer credits to the transaction and remove the handle. The only complication is that we need to start a commit operation if…
jbd2_journal_start_reserved – start reserved handle Synopsis int jbd2_journal_start_reserved(handle_t *handle, unsigned int type, unsigned int line_no); Arguments handle handle to start type — undescribed — line_no — undescribed — Description Start handle that has been previously reserved with jbd2_journal_reserve. This attaches handle to the running transaction (or creates one if there’s not transaction running). Unlike jbd2_journal_start…
jbd2_journal_skip_recovery – Start journal and wipe exiting records Synopsis int jbd2_journal_skip_recovery(journal_t *journal); Arguments journal journal to startup Description Locate any valid recovery information from the journal and set up the journal structures in memory to ignore it (presumably because the caller has evidence that it is out of date). This function doesn’t appear to be…
jbd2_journal_set_triggers – Add triggers for commit writeout Synopsis void jbd2_journal_set_triggers(struct buffer_head *bh, struct jbd2_buffer_trigger_type *type); Arguments bh buffer to trigger on type struct jbd2_buffer_trigger_type containing the trigger(s). Description Set any triggers on this journal_head. This is always safe, because triggers for a committing buffer will be saved off, and triggers for a running transaction will…