user/sven/linux.git/include/linux/bvec.h, branch v5.15.73

bvec: add a bvec_virt helper

2021-08-16T16:50:32Z

Add a helper to get the virtual address for a bvec. This avoids that all callers need to know about the page + offset representation. Signed-off-by: Christoph Hellwig Reviewed-by: Chaitanya Kulkarni Reviewed-by: Martin K. Petersen Link: https://lore.kernel.org/r/20210804095634.460779-2-hch@lst.de Signed-off-by: Jens Axboe

bvec: add memcpy_{from,to}_bvec and memzero_bvec helper

2021-08-02T19:37:27Z

Add helpers to perform common memory operation on a bvec. Signed-off-by: Christoph Hellwig Reviewed-by: Chaitanya Kulkarni Reviewed-by: Martin K. Petersen Reviewed-by: Ira Weiny Link: https://lore.kernel.org/r/20210727055646.118787-5-hch@lst.de Signed-off-by: Jens Axboe

bvec: add a bvec_kmap_local helper

2021-08-02T19:37:27Z

Add a helper to call kmap_local_page on a bvec. There is no need for an unmap helper given that kunmap_local accept any address in the mapped page. Signed-off-by: Christoph Hellwig Reviewed-by: Chaitanya Kulkarni Reviewed-by: Martin K. Petersen Reviewed-by: Ira Weiny Link: https://lore.kernel.org/r/20210727055646.118787-4-hch@lst.de Signed-off-by: Jens Axboe

bvec: fix the include guards for bvec.h

2021-08-02T19:37:27Z

Fix the include guards to match the file naming. Signed-off-by: Christoph Hellwig Reviewed-by: Bart Van Assche Reviewed-by: Chaitanya Kulkarni Reviewed-by: Martin K. Petersen Reviewed-by: Ira Weiny Link: https://lore.kernel.org/r/20210727055646.118787-3-hch@lst.de Signed-off-by: Jens Axboe

block: optimise for_each_bvec() advance

2020-12-02T16:46:55Z

Because of how for_each_bvec() works it never advances across multiple entries at a time, so bvec_iter_advance() is an overkill. Add specialised bvec_iter_advance_single() that is faster. It also handles zero-len bvecs, so can kill bvec_iter_skip_zero_bvec(). text data bss dec hex filename before: 23977 805 0 24782 60ce lib/iov_iter.o before, bvec_iter_advance() w/o WARN_ONCE() 22886 600 0 23486 5bbe ./lib/iov_iter.o after: 21862 600 0 22462 57be lib/iov_iter.o Signed-off-by: Pavel Begunkov Reviewed-by: Ming Lei Reviewed-by: Christoph Hellwig Signed-off-by: Jens Axboe

kernel.h: split out min()/max() et al. helpers

2020-10-16T18:11:19Z

kernel.h is being used as a dump for all kinds of stuff for a long time. Here is the attempt to start cleaning it up by splitting out min()/max() et al. helpers. At the same time convert users in header and lib folder to use new header. Though for time being include new header back to kernel.h to avoid twisted indirected includes for other existing users. Signed-off-by: Andy Shevchenko Signed-off-by: Andrew Morton Cc: "Rafael J. Wysocki" Cc: Steven Rostedt Cc: Rasmus Villemoes Cc: Joe Perches Cc: Linus Torvalds Link: https://lkml.kernel.org/r/20200910164152.GA1891694@smile.fi.intel.com Signed-off-by: Linus Torvalds

block: allow for_each_bvec to support zero len bvec

2020-09-03T02:59:40Z

Block layer usually doesn't support or allow zero-length bvec. Since commit 1bdc76aea115 ("iov_iter: use bvec iterator to implement iterate_bvec()"), iterate_bvec() switches to bvec iterator. However, Al mentioned that 'Zero-length segments are not disallowed' in iov_iter. Fixes for_each_bvec() so that it can move on after seeing one zero length bvec. Fixes: 1bdc76aea115 ("iov_iter: use bvec iterator to implement iterate_bvec()") Reported-by: syzbot Signed-off-by: Ming Lei Tested-by: Tetsuo Handa Cc: Al Viro Cc: Matthew Wilcox Cc: Link: https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg2262077.html Signed-off-by: Jens Axboe

block: Document the bio_vec properties

2020-05-19T15:40:29Z

Since it is nontrivial that nth_page() does not have to be used for a bio_vec, document this. Signed-off-by: Bart Van Assche Reviewed-by: Christoph Hellwig CC: Christoph Hellwig Cc: Ming Lei Signed-off-by: Jens Axboe

block: remove unused mp_bvec_last_segment

2020-01-05T03:23:39Z

After commit 85a8ce62c2ea ("block: add bio_truncate to fix guard_bio_eod") this function is unused, remove it. Reviewed-by: Ming Lei Signed-off-by: Jens Axboe

block: optimise bvec_iter_advance()

2019-12-03T14:36:38Z

bvec_iter_advance() is quite popular, but compilers fail to do proper alias analysis and optimise it good enough. The assembly is checked for gcc 9.2, x86-64. - remove @iter->bi_size from min(...), as it's always less than @bytes. Modify at the beginning and forget about it. - the compiler isn't able to collapse memory dependencies and remove writes in the loop. Help it by explicitely using local vars. Signed-off-by: Arvind Sankar Signed-off-by: Pavel Begunkov Signed-off-by: Jens Axboe