From 11c3e689f1c3a73e3af7b0ea767b1b0626da8033 Mon Sep 17 00:00:00 2001 From: James Bottomley Date: Mon, 31 Dec 2007 16:37:00 -0600 Subject: [SCSI] block: Introduce new blk_queue_update_dma_alignment interface The purpose of this is to allow stacked alignment settings, with the ultimate queue alignment being set to the largest alignment requirement in the stack. The reason for this is so that the SCSI mid-layer can relax the default alignment requirements (which are basically causing a lot of superfluous copying to go on in the SG_IO interface) while allowing transports, devices or HBAs to add stricter limits if they need them. Acked-by: Jens Axboe Signed-off-by: James Bottomley --- include/linux/blkdev.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux/blkdev.h') diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index d18ee67b40f8..81e99e516302 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -766,6 +766,7 @@ extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); extern void blk_queue_dma_alignment(struct request_queue *, int); +extern void blk_queue_update_dma_alignment(struct request_queue *, int); extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *); -- cgit v1.2.3 From 29ed2a5f8c4380959f18e9cbaff13bc61e09889c Mon Sep 17 00:00:00 2001 From: Bartlomiej Zolnierkiewicz Date: Fri, 25 Jan 2008 22:17:11 +0100 Subject: ide: remove REQ_TYPE_ATA_TASK Based on the earlier work by Tejun Heo. All users are gone so we can finally remove it. Cc: Tejun Heo Signed-off-by: Bartlomiej Zolnierkiewicz --- include/linux/blkdev.h | 1 - 1 file changed, 1 deletion(-) (limited to 'include/linux/blkdev.h') diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index d18ee67b40f8..40ee1706caa3 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -144,7 +144,6 @@ enum rq_cmd_type_bits { * private REQ_LB opcodes to differentiate what type of request this is */ REQ_TYPE_ATA_CMD, - REQ_TYPE_ATA_TASK, REQ_TYPE_ATA_TASKFILE, REQ_TYPE_ATA_PC, }; -- cgit v1.2.3 From 7267c3377443322588cddaf457cf106839a60463 Mon Sep 17 00:00:00 2001 From: Bartlomiej Zolnierkiewicz Date: Sat, 26 Jan 2008 20:13:13 +0100 Subject: ide: remove REQ_TYPE_ATA_CMD Based on the earlier work by Tejun Heo. All users are gone so we can finally remove it. Cc: Tejun Heo Signed-off-by: Bartlomiej Zolnierkiewicz --- include/linux/blkdev.h | 1 - 1 file changed, 1 deletion(-) (limited to 'include/linux/blkdev.h') diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index bd20a4e8663a..49b7a4c31a6d 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -143,7 +143,6 @@ enum rq_cmd_type_bits { * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver * private REQ_LB opcodes to differentiate what type of request this is */ - REQ_TYPE_ATA_CMD, REQ_TYPE_ATA_TASKFILE, REQ_TYPE_ATA_PC, }; -- cgit v1.2.3 From 482eb689169948e9f4966fbae6be4d6bc0bfa818 Mon Sep 17 00:00:00 2001 From: Pete Wyckoff Date: Tue, 1 Jan 2008 10:23:02 -0500 Subject: block: allow queue dma_alignment of zero Let queue_dma_alignment return 0 if it was specifically set to 0. This permits devices with no particular alignment restrictions to use arbitrary user space buffers without copying. Signed-off-by: Pete Wyckoff Signed-off-by: Jens Axboe --- include/linux/blkdev.h | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) (limited to 'include/linux/blkdev.h') diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 49b7a4c31a6d..c7a3ab575c24 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -836,12 +836,7 @@ static inline int bdev_hardsect_size(struct block_device *bdev) static inline int queue_dma_alignment(struct request_queue *q) { - int retval = 511; - - if (q && q->dma_alignment) - retval = q->dma_alignment; - - return retval; + return q ? q->dma_alignment : 511; } /* assumes size > 256 */ -- cgit v1.2.3 From 336cdb4003200a90f4fc52a4e9ccc2baa570fffb Mon Sep 17 00:00:00 2001 From: Kiyoshi Ueda Date: Tue, 11 Dec 2007 17:40:30 -0500 Subject: blk_end_request: add new request completion interface (take 4) This patch adds 2 new interfaces for request completion: o blk_end_request() : called without queue lock o __blk_end_request() : called with queue lock held blk_end_request takes 'error' as an argument instead of 'uptodate', which current end_that_request_* take. The meanings of values are below and the value is used when bio is completed. 0 : success < 0 : error Some device drivers call some generic functions below between end_that_request_{first/chunk} and end_that_request_last(). o add_disk_randomness() o blk_queue_end_tag() o blkdev_dequeue_request() These are called in the blk_end_request interfaces as a part of generic request completion. So all device drivers become to call above functions. To decide whether to call blkdev_dequeue_request(), blk_end_request uses list_empty(&rq->queuelist) (blk_queued_rq() macro is added for it). So drivers must re-initialize it using list_init() or so before calling blk_end_request if drivers use it for its specific purpose. (Currently, there is no driver which completes request without re-initializing the queuelist after used it. So rq->queuelist can be used for the purpose above.) "Normal" drivers can be converted to use blk_end_request() in a standard way shown below. a) end_that_request_{chunk/first} spin_lock_irqsave() (add_disk_randomness(), blk_queue_end_tag(), blkdev_dequeue_request()) end_that_request_last() spin_unlock_irqrestore() => blk_end_request() b) spin_lock_irqsave() end_that_request_{chunk/first} (add_disk_randomness(), blk_queue_end_tag(), blkdev_dequeue_request()) end_that_request_last() spin_unlock_irqrestore() => spin_lock_irqsave() __blk_end_request() spin_unlock_irqsave() c) spin_lock_irqsave() (add_disk_randomness(), blk_queue_end_tag(), blkdev_dequeue_request()) end_that_request_last() spin_unlock_irqrestore() => blk_end_request() or spin_lock_irqsave() __blk_end_request() spin_unlock_irqrestore() Signed-off-by: Kiyoshi Ueda Signed-off-by: Jun'ichi Nomura Signed-off-by: Jens Axboe --- include/linux/blkdev.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/linux/blkdev.h') diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 49b7a4c31a6d..3b212f02db8d 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -537,6 +537,8 @@ enum { #define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA) #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) #define blk_empty_barrier(rq) (blk_barrier_rq(rq) && blk_fs_request(rq) && !(rq)->hard_nr_sectors) +/* rq->queuelist of dequeued request must be list_empty() */ +#define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) @@ -724,6 +726,8 @@ static inline void blk_run_address_space(struct address_space *mapping) * for parts of the original function. This prevents * code duplication in drivers. */ +extern int blk_end_request(struct request *rq, int error, int nr_bytes); +extern int __blk_end_request(struct request *rq, int error, int nr_bytes); extern int end_that_request_first(struct request *, int, int); extern int end_that_request_chunk(struct request *, int, int); extern void end_that_request_last(struct request *, int); -- cgit v1.2.3 From 3b11313a6c2a42425bf06e92528bda6affd58dec Mon Sep 17 00:00:00 2001 From: Kiyoshi Ueda Date: Tue, 11 Dec 2007 17:41:17 -0500 Subject: blk_end_request: add/export functions to get request size (take 4) This patch adds/exports functions to get the size of request in bytes. They are useful because blk_end_request interfaces take bytes as a completed I/O size instead of sectors. Signed-off-by: Kiyoshi Ueda Signed-off-by: Jun'ichi Nomura Signed-off-by: Jens Axboe --- include/linux/blkdev.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'include/linux/blkdev.h') diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 3b212f02db8d..aa2341df7932 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -736,6 +736,14 @@ extern void end_queued_request(struct request *, int); extern void end_dequeued_request(struct request *, int); extern void blk_complete_request(struct request *); +/* + * blk_end_request() takes bytes instead of sectors as a complete size. + * blk_rq_bytes() returns bytes left to complete in the entire request. + * blk_rq_cur_bytes() returns bytes left to complete in the current segment. + */ +extern unsigned int blk_rq_bytes(struct request *rq); +extern unsigned int blk_rq_cur_bytes(struct request *rq); + /* * end_that_request_first/chunk() takes an uptodate argument. we account * any value <= as an io error. 0 means -EIO for compatability reasons, -- cgit v1.2.3 From e19a3ab058fe91c8c54d43dc56dccf7eb386478e Mon Sep 17 00:00:00 2001 From: Kiyoshi Ueda Date: Tue, 11 Dec 2007 17:51:02 -0500 Subject: blk_end_request: add callback feature (take 4) This patch adds a variant of the interface, blk_end_request_callback(), which has driver callback feature. Drivers may need to do special works between end_that_request_first() and end_that_request_last(). For such drivers, blk_end_request_callback() allows it to pass a callback function which is called between end_that_request_first() and end_that_request_last(). This interface is only for fallback of other blk_end_request interfaces. Drivers should avoid their tricky behaviors and use other interfaces as much as possible. Currently, only one driver, ide-cd, needs this interface. So this interface should/will be removed, after the driver removes such tricky behaviors. o ide-cd (cdrom_newpc_intr()) In PIO mode, cdrom_newpc_intr() needs to defer end_that_request_last() until the device clears DRQ_STAT and raises an interrupt after end_that_request_first(). So end_that_request_first() and end_that_request_last() are called separately in cdrom_newpc_intr(). This means blk_end_request_callback() has to return without completing request even if no leftover in the request. To satisfy the requirement, callback function has return value so that drivers can tell blk_end_request_callback() to return without completing request. Signed-off-by: Kiyoshi Ueda Signed-off-by: Jun'ichi Nomura Signed-off-by: Jens Axboe --- include/linux/blkdev.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/linux/blkdev.h') diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index aa2341df7932..63fe7542b3fa 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -734,6 +734,8 @@ extern void end_that_request_last(struct request *, int); extern void end_request(struct request *, int); extern void end_queued_request(struct request *, int); extern void end_dequeued_request(struct request *, int); +extern int blk_end_request_callback(struct request *rq, int error, int nr_bytes, + int (drv_callback)(struct request *)); extern void blk_complete_request(struct request *); /* -- cgit v1.2.3 From e3a04fe34a3ec81ddeddb6c73fb7299716cffbb0 Mon Sep 17 00:00:00 2001 From: Kiyoshi Ueda Date: Tue, 11 Dec 2007 17:51:46 -0500 Subject: blk_end_request: add bidi completion interface (take 4) This patch adds a variant of the interface, blk_end_bidi_request(), which completes a bidi request. Bidi request must be completed as a whole, both rq and rq->next_rq at once. So the interface has 2 arguments for completion size. As for ->end_io, only rq->end_io is called (rq->next_rq->end_io is not called). So if special completion handling is needed, the handler must be set to rq->end_io. And the handler must take care of freeing next_rq too, since the interface doesn't care of it if rq->end_io is not NULL. Cc: Boaz Harrosh Signed-off-by: Kiyoshi Ueda Signed-off-by: Jun'ichi Nomura Signed-off-by: Jens Axboe --- include/linux/blkdev.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/linux/blkdev.h') diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 63fe7542b3fa..029b7097f9e5 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -728,6 +728,8 @@ static inline void blk_run_address_space(struct address_space *mapping) */ extern int blk_end_request(struct request *rq, int error, int nr_bytes); extern int __blk_end_request(struct request *rq, int error, int nr_bytes); +extern int blk_end_bidi_request(struct request *rq, int error, int nr_bytes, + int bidi_bytes); extern int end_that_request_first(struct request *, int, int); extern int end_that_request_chunk(struct request *, int, int); extern void end_that_request_last(struct request *, int); -- cgit v1.2.3 From 3bcddeac1c4c7e6fb90531b80f236b1a05dfe514 Mon Sep 17 00:00:00 2001 From: Kiyoshi Ueda Date: Tue, 11 Dec 2007 17:52:28 -0500 Subject: blk_end_request: remove/unexport end_that_request_* (take 4) This patch removes the following functions: o end_that_request_first() o end_that_request_chunk() and stops exporting the functions below: o end_that_request_last() Cc: Boaz Harrosh Signed-off-by: Kiyoshi Ueda Signed-off-by: Jun'ichi Nomura Signed-off-by: Jens Axboe --- include/linux/blkdev.h | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) (limited to 'include/linux/blkdev.h') diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 029b7097f9e5..0c39ac75bed4 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -718,21 +718,18 @@ static inline void blk_run_address_space(struct address_space *mapping) } /* - * end_request() and friends. Must be called with the request queue spinlock - * acquired. All functions called within end_request() _must_be_ atomic. + * blk_end_request() and friends. + * __blk_end_request() and end_request() must be called with + * the request queue spinlock acquired. * * Several drivers define their own end_request and call - * end_that_request_first() and end_that_request_last() - * for parts of the original function. This prevents - * code duplication in drivers. + * blk_end_request() for parts of the original function. + * This prevents code duplication in drivers. */ extern int blk_end_request(struct request *rq, int error, int nr_bytes); extern int __blk_end_request(struct request *rq, int error, int nr_bytes); extern int blk_end_bidi_request(struct request *rq, int error, int nr_bytes, int bidi_bytes); -extern int end_that_request_first(struct request *, int, int); -extern int end_that_request_chunk(struct request *, int, int); -extern void end_that_request_last(struct request *, int); extern void end_request(struct request *, int); extern void end_queued_request(struct request *, int); extern void end_dequeued_request(struct request *, int); -- cgit v1.2.3 From 5450d3e1d68f10be087f0855d8bad5458b50ecbe Mon Sep 17 00:00:00 2001 From: Kiyoshi Ueda Date: Tue, 11 Dec 2007 17:53:03 -0500 Subject: blk_end_request: cleanup 'uptodate' related code (take 4) This patch converts 'uptodate' arguments of no longer exported interfaces, end_that_request_first/last, to 'error', and removes internal conversions for it in blk_end_request interfaces. Also, this patch removes no longer needed end_io_error(). Cc: Boaz Harrosh Signed-off-by: Kiyoshi Ueda Signed-off-by: Jun'ichi Nomura Signed-off-by: Jens Axboe --- include/linux/blkdev.h | 8 -------- 1 file changed, 8 deletions(-) (limited to 'include/linux/blkdev.h') diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 0c39ac75bed4..0ea82d222046 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -745,14 +745,6 @@ extern void blk_complete_request(struct request *); extern unsigned int blk_rq_bytes(struct request *rq); extern unsigned int blk_rq_cur_bytes(struct request *rq); -/* - * end_that_request_first/chunk() takes an uptodate argument. we account - * any value <= as an io error. 0 means -EIO for compatability reasons, - * any other < 0 value is the direct error type. An uptodate value of - * 1 indicates successful io completion - */ -#define end_io_error(uptodate) (unlikely((uptodate) <= 0)) - static inline void blkdev_dequeue_request(struct request *req) { elv_dequeue_request(req->q, req); -- cgit v1.2.3 From fd0928df98b9578be8a786ac0cb78a47a5e17a20 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Thu, 24 Jan 2008 08:52:45 +0100 Subject: ioprio: move io priority from task_struct to io_context This is where it belongs and then it doesn't take up space for a process that doesn't do IO. Signed-off-by: Jens Axboe --- include/linux/blkdev.h | 81 +++++--------------------------------------------- 1 file changed, 7 insertions(+), 74 deletions(-) (limited to 'include/linux/blkdev.h') diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 49b7a4c31a6d..510a18ba1ec5 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -34,83 +34,10 @@ struct sg_io_hdr; #define BLKDEV_MIN_RQ 4 #define BLKDEV_MAX_RQ 128 /* Default maximum */ -/* - * This is the per-process anticipatory I/O scheduler state. - */ -struct as_io_context { - spinlock_t lock; - - void (*dtor)(struct as_io_context *aic); /* destructor */ - void (*exit)(struct as_io_context *aic); /* called on task exit */ - - unsigned long state; - atomic_t nr_queued; /* queued reads & sync writes */ - atomic_t nr_dispatched; /* number of requests gone to the drivers */ - - /* IO History tracking */ - /* Thinktime */ - unsigned long last_end_request; - unsigned long ttime_total; - unsigned long ttime_samples; - unsigned long ttime_mean; - /* Layout pattern */ - unsigned int seek_samples; - sector_t last_request_pos; - u64 seek_total; - sector_t seek_mean; -}; - -struct cfq_queue; -struct cfq_io_context { - struct rb_node rb_node; - void *key; - - struct cfq_queue *cfqq[2]; - - struct io_context *ioc; - - unsigned long last_end_request; - sector_t last_request_pos; - - unsigned long ttime_total; - unsigned long ttime_samples; - unsigned long ttime_mean; - - unsigned int seek_samples; - u64 seek_total; - sector_t seek_mean; - - struct list_head queue_list; - - void (*dtor)(struct io_context *); /* destructor */ - void (*exit)(struct io_context *); /* called on task exit */ -}; - -/* - * This is the per-process I/O subsystem state. It is refcounted and - * kmalloc'ed. Currently all fields are modified in process io context - * (apart from the atomic refcount), so require no locking. - */ -struct io_context { - atomic_t refcount; - struct task_struct *task; - - unsigned int ioprio_changed; - - /* - * For request batching - */ - unsigned long last_waited; /* Time last woken after wait for request */ - int nr_batch_requests; /* Number of requests left in the batch */ - - struct as_io_context *aic; - struct rb_root cic_root; - void *ioc_data; -}; - void put_io_context(struct io_context *ioc); void exit_io_context(void); struct io_context *get_io_context(gfp_t gfp_flags, int node); +struct io_context *alloc_io_context(gfp_t gfp_flags, int node); void copy_io_context(struct io_context **pdst, struct io_context **psrc); void swap_io_context(struct io_context **ioc1, struct io_context **ioc2); @@ -894,6 +821,12 @@ static inline void exit_io_context(void) { } +static inline int put_io_context(struct io_context *ioc) +{ + return 1; +} + + #endif /* CONFIG_BLOCK */ #endif -- cgit v1.2.3 From d38ecf935fcb10264a6bc190855d9595165e6eeb Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Thu, 24 Jan 2008 08:53:35 +0100 Subject: io context sharing: preliminary support Detach task state from ioc, instead keep track of how many processes are accessing the ioc. Signed-off-by: Jens Axboe --- include/linux/blkdev.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'include/linux/blkdev.h') diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 510a18ba1ec5..2483a05231c7 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -34,7 +34,7 @@ struct sg_io_hdr; #define BLKDEV_MIN_RQ 4 #define BLKDEV_MAX_RQ 128 /* Default maximum */ -void put_io_context(struct io_context *ioc); +int put_io_context(struct io_context *ioc); void exit_io_context(void); struct io_context *get_io_context(gfp_t gfp_flags, int node); struct io_context *alloc_io_context(gfp_t gfp_flags, int node); -- cgit v1.2.3 From fa0ccd837e3dddb44c7db2f128a8bb7e4eabc21a Mon Sep 17 00:00:00 2001 From: James Bottomley Date: Thu, 10 Jan 2008 11:30:36 -0600 Subject: block: implement drain buffers These DMA drain buffer implementations in drivers are pretty horrible to do in terms of manipulating the scatterlist. Plus they're being done at least in drivers/ide and drivers/ata, so we now have code duplication. The one use case for this, as I understand it is AHCI controllers doing PIO mode to mmc devices but translating this to DMA at the controller level. So, what about adding a callback to the block layer that permits the adding of the drain buffer for the problem devices. The idea is that you'd do this in slave_configure after you find one of these devices. The beauty of doing it in the block layer is that it quietly adds the drain buffer to the end of the sg list, so it automatically gets mapped (and unmapped) without anything unusual having to be done to the scatterlist in driver/scsi or drivers/ata and without any alteration to the transfer length. Signed-off-by: James Bottomley Signed-off-by: Jens Axboe --- include/linux/blkdev.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/linux/blkdev.h') diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index c7a3ab575c24..e542c8fd9215 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -429,6 +429,8 @@ struct request_queue unsigned int max_segment_size; unsigned long seg_boundary_mask; + void *dma_drain_buffer; + unsigned int dma_drain_size; unsigned int dma_alignment; struct blk_queue_tag *queue_tags; @@ -760,6 +762,8 @@ extern void blk_queue_max_hw_segments(struct request_queue *, unsigned short); extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); extern void blk_queue_hardsect_size(struct request_queue *, unsigned short); extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); +extern int blk_queue_dma_drain(struct request_queue *q, void *buf, + unsigned int size); extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); -- cgit v1.2.3 From 023ccde109b995bb99862bf9c87efd006b1d1885 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Tue, 29 Jan 2008 14:08:06 +0100 Subject: block: fix warning on compile with CONFIG_BLOCK struct io_context was not defined, just add an empty forward decl. Signed-off-by: Jens Axboe --- include/linux/blkdev.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux/blkdev.h') diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 71e7a847dffc..e18d4192f6e8 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -825,6 +825,7 @@ static inline void exit_io_context(void) { } +struct io_context; static inline int put_io_context(struct io_context *ioc) { return 1; -- cgit v1.2.3