trace_block_sleeprq – waiting to get a free request entry in queue for block IO operation Synopsis void trace_block_sleeprq(struct request_queue *q, struct bio *bio, int rw); Arguments q queue for operation bio pending block IO operation rw low bit indicates a read (0) or a write (1) Description In the case where a request struct cannot…
trace_block_rq_requeue – place block IO request back on a queue Synopsis void trace_block_rq_requeue(struct request_queue *q, struct request *rq); Arguments q queue holding operation rq block IO operation request Description The block operation request rq is being placed back into queue q. For some reason the request was not completed and needs to be put back…
trace_block_rq_remap – map request for a block operation request Synopsis void trace_block_rq_remap(struct request_queue *q, struct request *rq, dev_t dev, sector_t from); Arguments q queue holding the operation rq block IO operation request dev device for the operation from original sector for the operation Description The block operation request rq in q has been remapped. The…
trace_block_rq_issue – issue pending block IO request operation to device driver Synopsis void trace_block_rq_issue(struct request_queue *q, struct request *rq); Arguments q queue holding operation rq block IO operation operation request Description Called when block operation request rq from queue q is sent to a device driver for processing. Authors Jason Baron <jbaron [at] redhat.com> Author….
trace_block_rq_insert – insert block operation request into queue Synopsis void trace_block_rq_insert(struct request_queue *q, struct request *rq); Arguments q target queue rq block IO operation request Description Called immediately before block operation request rq is inserted into queue q. The fields in the operation request rq struct can be examined to determine which device and sectors…
trace_block_rq_complete – block IO operation completed by device driver Synopsis void trace_block_rq_complete(struct request_queue *q, struct request *rq, unsigned int nr_bytes); Arguments q queue containing the block operation request rq block operations request nr_bytes number of completed bytes Description The block_rq_complete tracepoint event indicates that some portion of operation request has been completed by the device…
trace_block_rq_abort – abort block operation request Synopsis void trace_block_rq_abort(struct request_queue *q, struct request *rq); Arguments q queue containing the block operation request rq block IO operation request Description Called immediately after pending block IO operation request rq in queue q is aborted. The fields in the operation request rq can be examined to determine which…
trace_block_plug – keep operations requests in request queue Synopsis void trace_block_plug(struct request_queue *q); Arguments q request queue to plug Description Plug the request queue q. Do not allow block operation requests to be sent to the device driver. Instead, accumulate requests in the queue to improve throughput performance of the block device. Authors Jason Baron…
trace_block_getrq – get a free request entry in queue for block IO operations Synopsis void trace_block_getrq(struct request_queue *q, struct bio *bio, int rw); Arguments q queue for operations bio pending block IO operation rw low bit indicates a read (0) or a write (1) Description A request struct for queue q has been allocated to…
trace_block_dirty_buffer – mark a buffer dirty Synopsis void trace_block_dirty_buffer(struct buffer_head *bh); Arguments bh buffer_head being dirtied Description Called from mark_buffer_dirty. Authors Jason Baron <jbaron [at] redhat.com> Author. William Cohen <wcohen [at] redhat.com> Author. Copyright
trace_block_bio_remap – map request for a logical device to the raw device Synopsis void trace_block_bio_remap(struct request_queue *q, struct bio *bio, dev_t dev, sector_t from); Arguments q queue holding the operation bio revised operation dev device for the operation from original sector for the operation Description An operation for a logical device has been mapped to…
trace_block_bio_queue – putting new block IO operation in queue Synopsis void trace_block_bio_queue(struct request_queue *q, struct bio *bio); Arguments q queue holding operation bio new block operation Description About to place the block IO operation bio into queue q. Authors Jason Baron <jbaron [at] redhat.com> Author. William Cohen <wcohen [at] redhat.com> Author. Copyright
trace_block_bio_frontmerge – merging block operation to the beginning of an existing operation Synopsis void trace_block_bio_frontmerge(struct request_queue *q, struct request *rq, struct bio *bio); Arguments q queue holding operation rq request bio is being merged into bio new block operation to merge Description Merging block IO operation bio to the beginning of an existing block operation…
trace_block_bio_complete – completed all work on the block operation Synopsis void trace_block_bio_complete(struct request_queue *q, struct bio *bio, int error); Arguments q queue holding the block operation bio block operation completed error io error value Description This tracepoint indicates there is no further work to do on this block IO operation bio. Authors Jason Baron <jbaron…
trace_block_bio_bounce – used bounce buffer when processing block operation Synopsis void trace_block_bio_bounce(struct request_queue *q, struct bio *bio); Arguments q queue holding the block operation bio block operation Description A bounce buffer was used to handle the block operation bio in q. This occurs when hardware limitations prevent a direct transfer of data between the bio…
trace_block_bio_backmerge – merging block operation to the end of an existing operation Synopsis void trace_block_bio_backmerge(struct request_queue *q, struct request *rq, struct bio *bio); Arguments q queue holding operation rq request bio is being merged into bio new block operation to merge Description Merging block request bio to the end of an existing block request in…
thaw_super – – unlock filesystem Synopsis int thaw_super(struct super_block *sb); Arguments sb the super to thaw Description Unlocks the filesystem and marks it writeable again after freeze_super. Copyright
thaw_bdev – – unlock filesystem Synopsis int thaw_bdev(struct block_device *bdev, struct super_block *sb); Arguments bdev blockdevice to unlock sb associated superblock Description Unlocks the filesystem and marks it writeable again after freeze_bdev. Copyright
test_bit – Determine whether a bit is set Synopsis bool test_bit(int nr, const volatile unsigned long * addr); Arguments nr bit number to test addr Address to start counting from Copyright
test_and_set_bit_lock – Set a bit and return its old value for lock Synopsis bool test_and_set_bit_lock(long nr, volatile unsigned long * addr); Arguments nr Bit to set addr Address to count from Description This is the same as test_and_set_bit on x86. Copyright