user/sven/linux.git/include/linux/bio.h, branch v3.18.27

block: add bioset_create_nobvec()

2014-10-03T21:28:18Z

Users of bio_clone_fast() do not want bios with their own bvecs. Allocating a bvec mempool as part of the bioset intended for such users is a waste of memory. bioset_create_nobvec() creates a bioset that doesn't have the bvec mempool. Signed-off-by: Jun'ichi Nomura Signed-off-by: Mike Snitzer Signed-off-by: Jens Axboe

sd: Honor block layer integrity handling flags

2014-09-30T21:17:35Z

A set of flags introduced in the block layer enable better control over how protection information is handled. These flags are useful for both error injection and data recovery purposes. Checking can be enabled and disabled for controller and disk, and the guard tag format is now a per-I/O property. Update sd_protect_op to communicate the relevant information to the low-level device driver via a set of flags in scsi_cmnd. Signed-off-by: Martin K. Petersen Reviewed-by: Sagi Grimberg Acked-by: Christoph Hellwig Signed-off-by: Jens Axboe

block: Integrity checksum flag

2014-09-27T15:14:55Z

Make the choice of checksum a per-I/O property by introducing a flag that can be inspected by the SCSI layer. There are several reasons for this: 1. It allows us to switch choice of checksum without unloading and reloading the HBA driver. 2. During error recovery we need to be able to tell the HBA that checksums read from disk should not be verified and converted to IP checksums. 3. For error injection purposes we need to be able to write a bad guard tag to storage. Since the storage device only supports T10 CRC we need to be able to disable IP checksum conversion on the HBA. Signed-off-by: Martin K. Petersen Reviewed-by: Sagi Grimberg Signed-off-by: Jens Axboe

block: Relocate bio integrity flags

2014-09-27T15:14:54Z

Move flags affecting the integrity code out of the bio bi_flags and into the block integrity payload. Signed-off-by: Martin K. Petersen Reviewed-by: Sagi Grimberg Signed-off-by: Jens Axboe

block: Clean up the code used to generate and verify integrity metadata

2014-09-27T15:14:51Z

Instead of the "operate" parameter we pass in a seed value and a pointer to a function that can be used to process the integrity metadata. The generation function is changed to have a return value to fit into this scheme. Signed-off-by: Martin K. Petersen Reviewed-by: Sagi Grimberg Signed-off-by: Jens Axboe

block: Remove bip_buf

2014-09-27T15:14:50Z

bip_buf is not really needed so we can remove it. Signed-off-by: Martin K. Petersen Reviewed-by: Christoph Hellwig Reviewed-by: Sagi Grimberg Signed-off-by: Jens Axboe

block: Remove integrity tagging functions

2014-09-27T15:14:50Z

None of the filesystems appear interested in using the integrity tagging feature. Potentially because very few storage devices actually permit using the application tag space. Remove the tagging functions. Signed-off-by: Martin K. Petersen Reviewed-by: Christoph Hellwig Reviewed-by: Sagi Grimberg Signed-off-by: Jens Axboe

block: Replace bi_integrity with bi_special

2014-09-27T15:14:46Z

For commands like REQ_COPY we need a way to pass extra information along with each bio. Like integrity metadata this information must be available at the bottom of the stack so bi_private does not suffice. Rename the existing bi_integrity field to bi_special and make it a union so we can have different bio extensions for each class of command. We previously used bi_integrity != NULL as a way to identify whether a bio had integrity metadata or not. Introduce a REQ_INTEGRITY to be the indicator now that bi_special can contain different things. In addition, bio_integrity(bio) will now return a pointer to the integrity payload (when applicable). Signed-off-by: Martin K. Petersen Reviewed-by: Christoph Hellwig Reviewed-by: Sagi Grimberg Signed-off-by: Jens Axboe

block: Get rid of bdev_integrity_enabled()

2014-09-27T15:14:44Z

bdev_integrity_enabled() is only used by bio_integrity_enabled(). Combine these two functions. Signed-off-by: Martin K. Petersen Reviewed-by: Christoph Hellwig Reviewed-by: Sagi Grimberg Signed-off-by: Jens Axboe

bio-integrity: add "bip_max_vcnt" into struct bio_integrity_payload

2014-07-01T16:36:47Z

Commit 08778795 ("block: Fix nr_vecs for inline integrity vectors") from Martin introduces the function bip_integrity_vecs(get the useful vectors) to fix the issue about nr_vecs for inline integrity vectors that reported by David Milburn. But it seems that bip_integrity_vecs() will return the wrong number if the bio is not based on any bio_set for some reason(bio->bi_pool == NULL), because in that case, the bip_inline_vecs[0] is malloced directly. So here we add the bip_max_vcnt to record the count of vector slots, and cleanup the function bip_integrity_vecs(). Signed-off-by: Gu Zheng Cc: Martin K. Petersen Cc: Kent Overstreet Signed-off-by: Jens Axboe