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author | Mike Christie <michaelc@cs.wisc.edu> | 2005-11-11 05:30:27 -0600 |
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committer | James Bottomley <jejb@mulgrave.(none)> | 2005-12-14 19:03:35 -0800 |
commit | 6e68af666f5336254b5715dca591026b7324499a (patch) | |
tree | 5640209b6e2b75659149460f14531cfecffe2f5d /fs | |
parent | 6e39b69e7ea9205c5f80aeac3ef999ab8fb1a4cc (diff) | |
download | kernel_samsung_smdk4412-6e68af666f5336254b5715dca591026b7324499a.zip kernel_samsung_smdk4412-6e68af666f5336254b5715dca591026b7324499a.tar.gz kernel_samsung_smdk4412-6e68af666f5336254b5715dca591026b7324499a.tar.bz2 |
[SCSI] Convert SCSI mid-layer to scsi_execute_async
Add scsi helpers to create really-large-requests and convert
scsi-ml to scsi_execute_async().
Per Jens's previous comments, I placed this function in scsi_lib.c.
I made it follow all the queue's limits - I think I did at least :), so
I removed the warning on the function header.
I think the scsi_execute_* functions should eventually take a request_queue
and be placed some place where the dm-multipath hw_handler can use them
if that failover code is going to stay in the kernel. That conversion
patch will be sent in another mail though.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/bio.c | 20 |
1 files changed, 20 insertions, 0 deletions
@@ -386,6 +386,25 @@ static int __bio_add_page(request_queue_t *q, struct bio *bio, struct page } /** + * bio_add_pc_page - attempt to add page to bio + * @bio: destination bio + * @page: page to add + * @len: vec entry length + * @offset: vec entry offset + * + * Attempt to add a page to the bio_vec maplist. This can fail for a + * number of reasons, such as the bio being full or target block + * device limitations. The target block device must allow bio's + * smaller than PAGE_SIZE, so it is always possible to add a single + * page to an empty bio. This should only be used by REQ_PC bios. + */ +int bio_add_pc_page(request_queue_t *q, struct bio *bio, struct page *page, + unsigned int len, unsigned int offset) +{ + return __bio_add_page(q, bio, page, len, offset); +} + +/** * bio_add_page - attempt to add page to bio * @bio: destination bio * @page: page to add @@ -1228,6 +1247,7 @@ EXPORT_SYMBOL(bio_clone); EXPORT_SYMBOL(bio_phys_segments); EXPORT_SYMBOL(bio_hw_segments); EXPORT_SYMBOL(bio_add_page); +EXPORT_SYMBOL(bio_add_pc_page); EXPORT_SYMBOL(bio_get_nr_vecs); EXPORT_SYMBOL(bio_map_user); EXPORT_SYMBOL(bio_unmap_user); |