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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
Many source files in the tree are missing licensing information, which makes it harder for compliance tools to determine the correct license. By default all files without license information are under the default license of the kernel, which is GPL version 2. Update the files which contain no license information with the 'GPL-2.0' SPDX license identifier. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. How this work was done: Patches were generated and checked against linux-4.14-rc6 for a subset of the use cases: - file had no licensing information it it. - file was a */uapi/* one with no licensing information in it, - file was a */uapi/* one with existing licensing information, Further patches will be generated in subsequent months to fix up cases where non-standard license headers were used, and references to license had to be inferred by heuristics based on keywords. The analysis to determine which SPDX License Identifier to be applied to a file was done in a spreadsheet of side by side results from of the output of two independent scanners (ScanCode & Windriver) producing SPDX tag:value files created by Philippe Ombredanne. Philippe prepared the base worksheet, and did an initial spot review of a few 1000 files. The 4.13 kernel was the starting point of the analysis with 60,537 files assessed. Kate Stewart did a file by file comparison of the scanner results in the spreadsheet to determine which SPDX license identifier(s) to be applied to the file. She confirmed any determination that was not immediately clear with lawyers working with the Linux Foundation. Criteria used to select files for SPDX license identifier tagging was: - Files considered eligible had to be source code files. - Make and config files were included as candidates if they contained >5 lines of source - File already had some variant of a license header in it (even if <5 lines). All documentation files were explicitly excluded. The following heuristics were used to determine which SPDX license identifiers to apply. - when both scanners couldn't find any license traces, file was considered to have no license information in it, and the top level COPYING file license applied. For non */uapi/* files that summary was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 11139 and resulted in the first patch in this series. If that file was a */uapi/* path one, it was "GPL-2.0 WITH Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 WITH Linux-syscall-note 930 and resulted in the second patch in this series. - if a file had some form of licensing information in it, and was one of the */uapi/* ones, it was denoted with the Linux-syscall-note if any GPL family license was found in the file or had no licensing in it (per prior point). Results summary: SPDX license identifier # files ---------------------------------------------------|------ GPL-2.0 WITH Linux-syscall-note 270 GPL-2.0+ WITH Linux-syscall-note 169 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17 LGPL-2.1+ WITH Linux-syscall-note 15 GPL-1.0+ WITH Linux-syscall-note 14 ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5 LGPL-2.0+ WITH Linux-syscall-note 4 LGPL-2.1 WITH Linux-syscall-note 3 ((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3 ((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1 and that resulted in the third patch in this series. - when the two scanners agreed on the detected license(s), that became the concluded license(s). - when there was disagreement between the two scanners (one detected a license but the other didn't, or they both detected different licenses) a manual inspection of the file occurred. - In most cases a manual inspection of the information in the file resulted in a clear resolution of the license that should apply (and which scanner probably needed to revisit its heuristics). - When it was not immediately clear, the license identifier was confirmed with lawyers working with the Linux Foundation. - If there was any question as to the appropriate license identifier, the file was flagged for further research and to be revisited later in time. In total, over 70 hours of logged manual review was done on the spreadsheet to determine the SPDX license identifiers to apply to the source files by Kate, Philippe, Thomas and, in some cases, confirmation by lawyers working with the Linux Foundation. Kate also obtained a third independent scan of the 4.13 code base from FOSSology, and compared selected files where the other two scanners disagreed against that SPDX file, to see if there was new insights. The Windriver scanner is based on an older version of FOSSology in part, so they are related. Thomas did random spot checks in about 500 files from the spreadsheets for the uapi headers and agreed with SPDX license identifier in the files he inspected. For the non-uapi files Thomas did random spot checks in about 15000 files. In initial set of patches against 4.14-rc6, 3 files were found to have copy/paste license identifier errors, and have been fixed to reflect the correct identifier. Additionally Philippe spent 10 hours this week doing a detailed manual inspection and review of the 12,461 patched files from the initial patch version early this week with: - a full scancode scan run, collecting the matched texts, detected license ids and scores - reviewing anything where there was a license detected (about 500+ files) to ensure that the applied SPDX license was correct - reviewing anything where there was no detection but the patch license was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied SPDX license was correct This produced a worksheet with 20 files needing minor correction. This worksheet was then exported into 3 different .csv files for the different types of files to be modified. These .csv files were then reviewed by Greg. Thomas wrote a script to parse the csv files and add the proper SPDX tag to the file, in the format that the file expected. This script was further refined by Greg based on the output to detect more types of files automatically and to distinguish between header and source .c files (which need different comment types.) Finally Greg ran the script using the .csv files to generate the patches. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
822 lines
20 KiB
C
822 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Functions related to segment and merge handling
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/bio.h>
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#include <linux/blkdev.h>
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#include <linux/scatterlist.h>
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#include <trace/events/block.h>
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#include "blk.h"
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static struct bio *blk_bio_discard_split(struct request_queue *q,
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struct bio *bio,
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struct bio_set *bs,
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unsigned *nsegs)
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{
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unsigned int max_discard_sectors, granularity;
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int alignment;
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sector_t tmp;
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unsigned split_sectors;
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*nsegs = 1;
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/* Zero-sector (unknown) and one-sector granularities are the same. */
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granularity = max(q->limits.discard_granularity >> 9, 1U);
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max_discard_sectors = min(q->limits.max_discard_sectors, UINT_MAX >> 9);
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max_discard_sectors -= max_discard_sectors % granularity;
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if (unlikely(!max_discard_sectors)) {
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/* XXX: warn */
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return NULL;
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}
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if (bio_sectors(bio) <= max_discard_sectors)
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return NULL;
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split_sectors = max_discard_sectors;
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/*
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* If the next starting sector would be misaligned, stop the discard at
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* the previous aligned sector.
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*/
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alignment = (q->limits.discard_alignment >> 9) % granularity;
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tmp = bio->bi_iter.bi_sector + split_sectors - alignment;
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tmp = sector_div(tmp, granularity);
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if (split_sectors > tmp)
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split_sectors -= tmp;
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return bio_split(bio, split_sectors, GFP_NOIO, bs);
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}
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static struct bio *blk_bio_write_zeroes_split(struct request_queue *q,
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struct bio *bio, struct bio_set *bs, unsigned *nsegs)
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{
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*nsegs = 1;
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if (!q->limits.max_write_zeroes_sectors)
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return NULL;
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if (bio_sectors(bio) <= q->limits.max_write_zeroes_sectors)
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return NULL;
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return bio_split(bio, q->limits.max_write_zeroes_sectors, GFP_NOIO, bs);
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}
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static struct bio *blk_bio_write_same_split(struct request_queue *q,
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struct bio *bio,
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struct bio_set *bs,
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unsigned *nsegs)
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{
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*nsegs = 1;
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if (!q->limits.max_write_same_sectors)
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return NULL;
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if (bio_sectors(bio) <= q->limits.max_write_same_sectors)
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return NULL;
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return bio_split(bio, q->limits.max_write_same_sectors, GFP_NOIO, bs);
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}
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static inline unsigned get_max_io_size(struct request_queue *q,
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struct bio *bio)
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{
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unsigned sectors = blk_max_size_offset(q, bio->bi_iter.bi_sector);
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unsigned mask = queue_logical_block_size(q) - 1;
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/* aligned to logical block size */
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sectors &= ~(mask >> 9);
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return sectors;
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}
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static struct bio *blk_bio_segment_split(struct request_queue *q,
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struct bio *bio,
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struct bio_set *bs,
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unsigned *segs)
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{
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struct bio_vec bv, bvprv, *bvprvp = NULL;
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struct bvec_iter iter;
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unsigned seg_size = 0, nsegs = 0, sectors = 0;
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unsigned front_seg_size = bio->bi_seg_front_size;
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bool do_split = true;
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struct bio *new = NULL;
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const unsigned max_sectors = get_max_io_size(q, bio);
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bio_for_each_segment(bv, bio, iter) {
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/*
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* If the queue doesn't support SG gaps and adding this
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* offset would create a gap, disallow it.
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*/
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if (bvprvp && bvec_gap_to_prev(q, bvprvp, bv.bv_offset))
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goto split;
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if (sectors + (bv.bv_len >> 9) > max_sectors) {
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/*
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* Consider this a new segment if we're splitting in
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* the middle of this vector.
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*/
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if (nsegs < queue_max_segments(q) &&
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sectors < max_sectors) {
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nsegs++;
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sectors = max_sectors;
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}
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if (sectors)
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goto split;
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/* Make this single bvec as the 1st segment */
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}
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if (bvprvp && blk_queue_cluster(q)) {
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if (seg_size + bv.bv_len > queue_max_segment_size(q))
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goto new_segment;
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if (!BIOVEC_PHYS_MERGEABLE(bvprvp, &bv))
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goto new_segment;
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if (!BIOVEC_SEG_BOUNDARY(q, bvprvp, &bv))
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goto new_segment;
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seg_size += bv.bv_len;
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bvprv = bv;
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bvprvp = &bvprv;
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sectors += bv.bv_len >> 9;
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if (nsegs == 1 && seg_size > front_seg_size)
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front_seg_size = seg_size;
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continue;
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}
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new_segment:
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if (nsegs == queue_max_segments(q))
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goto split;
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nsegs++;
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bvprv = bv;
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bvprvp = &bvprv;
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seg_size = bv.bv_len;
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sectors += bv.bv_len >> 9;
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if (nsegs == 1 && seg_size > front_seg_size)
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front_seg_size = seg_size;
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}
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do_split = false;
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split:
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*segs = nsegs;
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if (do_split) {
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new = bio_split(bio, sectors, GFP_NOIO, bs);
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if (new)
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bio = new;
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}
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bio->bi_seg_front_size = front_seg_size;
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if (seg_size > bio->bi_seg_back_size)
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bio->bi_seg_back_size = seg_size;
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return do_split ? new : NULL;
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}
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void blk_queue_split(struct request_queue *q, struct bio **bio)
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{
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struct bio *split, *res;
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unsigned nsegs;
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switch (bio_op(*bio)) {
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case REQ_OP_DISCARD:
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case REQ_OP_SECURE_ERASE:
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split = blk_bio_discard_split(q, *bio, q->bio_split, &nsegs);
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break;
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case REQ_OP_WRITE_ZEROES:
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split = blk_bio_write_zeroes_split(q, *bio, q->bio_split, &nsegs);
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break;
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case REQ_OP_WRITE_SAME:
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split = blk_bio_write_same_split(q, *bio, q->bio_split, &nsegs);
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break;
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default:
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split = blk_bio_segment_split(q, *bio, q->bio_split, &nsegs);
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break;
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}
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/* physical segments can be figured out during splitting */
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res = split ? split : *bio;
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res->bi_phys_segments = nsegs;
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bio_set_flag(res, BIO_SEG_VALID);
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if (split) {
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/* there isn't chance to merge the splitted bio */
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split->bi_opf |= REQ_NOMERGE;
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bio_chain(split, *bio);
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trace_block_split(q, split, (*bio)->bi_iter.bi_sector);
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generic_make_request(*bio);
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*bio = split;
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}
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}
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EXPORT_SYMBOL(blk_queue_split);
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static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
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struct bio *bio,
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bool no_sg_merge)
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{
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struct bio_vec bv, bvprv = { NULL };
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int cluster, prev = 0;
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unsigned int seg_size, nr_phys_segs;
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struct bio *fbio, *bbio;
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struct bvec_iter iter;
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if (!bio)
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return 0;
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switch (bio_op(bio)) {
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case REQ_OP_DISCARD:
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case REQ_OP_SECURE_ERASE:
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case REQ_OP_WRITE_ZEROES:
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return 0;
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case REQ_OP_WRITE_SAME:
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return 1;
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}
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fbio = bio;
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cluster = blk_queue_cluster(q);
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seg_size = 0;
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nr_phys_segs = 0;
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for_each_bio(bio) {
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bio_for_each_segment(bv, bio, iter) {
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/*
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* If SG merging is disabled, each bio vector is
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* a segment
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*/
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if (no_sg_merge)
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goto new_segment;
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if (prev && cluster) {
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if (seg_size + bv.bv_len
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> queue_max_segment_size(q))
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goto new_segment;
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if (!BIOVEC_PHYS_MERGEABLE(&bvprv, &bv))
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goto new_segment;
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if (!BIOVEC_SEG_BOUNDARY(q, &bvprv, &bv))
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goto new_segment;
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seg_size += bv.bv_len;
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bvprv = bv;
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continue;
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}
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new_segment:
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if (nr_phys_segs == 1 && seg_size >
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fbio->bi_seg_front_size)
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fbio->bi_seg_front_size = seg_size;
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nr_phys_segs++;
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bvprv = bv;
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prev = 1;
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seg_size = bv.bv_len;
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}
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bbio = bio;
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}
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if (nr_phys_segs == 1 && seg_size > fbio->bi_seg_front_size)
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fbio->bi_seg_front_size = seg_size;
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if (seg_size > bbio->bi_seg_back_size)
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bbio->bi_seg_back_size = seg_size;
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return nr_phys_segs;
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}
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void blk_recalc_rq_segments(struct request *rq)
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{
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bool no_sg_merge = !!test_bit(QUEUE_FLAG_NO_SG_MERGE,
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&rq->q->queue_flags);
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rq->nr_phys_segments = __blk_recalc_rq_segments(rq->q, rq->bio,
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no_sg_merge);
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}
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void blk_recount_segments(struct request_queue *q, struct bio *bio)
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{
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unsigned short seg_cnt;
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/* estimate segment number by bi_vcnt for non-cloned bio */
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if (bio_flagged(bio, BIO_CLONED))
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seg_cnt = bio_segments(bio);
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else
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seg_cnt = bio->bi_vcnt;
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if (test_bit(QUEUE_FLAG_NO_SG_MERGE, &q->queue_flags) &&
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(seg_cnt < queue_max_segments(q)))
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bio->bi_phys_segments = seg_cnt;
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else {
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struct bio *nxt = bio->bi_next;
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bio->bi_next = NULL;
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bio->bi_phys_segments = __blk_recalc_rq_segments(q, bio, false);
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bio->bi_next = nxt;
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}
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bio_set_flag(bio, BIO_SEG_VALID);
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}
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EXPORT_SYMBOL(blk_recount_segments);
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static int blk_phys_contig_segment(struct request_queue *q, struct bio *bio,
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struct bio *nxt)
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{
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struct bio_vec end_bv = { NULL }, nxt_bv;
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if (!blk_queue_cluster(q))
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return 0;
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if (bio->bi_seg_back_size + nxt->bi_seg_front_size >
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queue_max_segment_size(q))
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return 0;
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|
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if (!bio_has_data(bio))
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return 1;
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bio_get_last_bvec(bio, &end_bv);
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bio_get_first_bvec(nxt, &nxt_bv);
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if (!BIOVEC_PHYS_MERGEABLE(&end_bv, &nxt_bv))
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return 0;
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|
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/*
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* bio and nxt are contiguous in memory; check if the queue allows
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* these two to be merged into one
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*/
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if (BIOVEC_SEG_BOUNDARY(q, &end_bv, &nxt_bv))
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return 1;
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|
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return 0;
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}
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static inline void
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__blk_segment_map_sg(struct request_queue *q, struct bio_vec *bvec,
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struct scatterlist *sglist, struct bio_vec *bvprv,
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struct scatterlist **sg, int *nsegs, int *cluster)
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{
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int nbytes = bvec->bv_len;
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if (*sg && *cluster) {
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if ((*sg)->length + nbytes > queue_max_segment_size(q))
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goto new_segment;
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if (!BIOVEC_PHYS_MERGEABLE(bvprv, bvec))
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goto new_segment;
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if (!BIOVEC_SEG_BOUNDARY(q, bvprv, bvec))
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goto new_segment;
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(*sg)->length += nbytes;
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} else {
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new_segment:
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if (!*sg)
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*sg = sglist;
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else {
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/*
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* If the driver previously mapped a shorter
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* list, we could see a termination bit
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* prematurely unless it fully inits the sg
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* table on each mapping. We KNOW that there
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* must be more entries here or the driver
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* would be buggy, so force clear the
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* termination bit to avoid doing a full
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* sg_init_table() in drivers for each command.
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*/
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sg_unmark_end(*sg);
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*sg = sg_next(*sg);
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}
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sg_set_page(*sg, bvec->bv_page, nbytes, bvec->bv_offset);
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(*nsegs)++;
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}
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*bvprv = *bvec;
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}
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|
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static inline int __blk_bvec_map_sg(struct request_queue *q, struct bio_vec bv,
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struct scatterlist *sglist, struct scatterlist **sg)
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{
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*sg = sglist;
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sg_set_page(*sg, bv.bv_page, bv.bv_len, bv.bv_offset);
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return 1;
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}
|
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|
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static int __blk_bios_map_sg(struct request_queue *q, struct bio *bio,
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struct scatterlist *sglist,
|
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struct scatterlist **sg)
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{
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struct bio_vec bvec, bvprv = { NULL };
|
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struct bvec_iter iter;
|
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int cluster = blk_queue_cluster(q), nsegs = 0;
|
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|
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for_each_bio(bio)
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bio_for_each_segment(bvec, bio, iter)
|
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__blk_segment_map_sg(q, &bvec, sglist, &bvprv, sg,
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&nsegs, &cluster);
|
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|
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return nsegs;
|
|
}
|
|
|
|
/*
|
|
* map a request to scatterlist, return number of sg entries setup. Caller
|
|
* must make sure sg can hold rq->nr_phys_segments entries
|
|
*/
|
|
int blk_rq_map_sg(struct request_queue *q, struct request *rq,
|
|
struct scatterlist *sglist)
|
|
{
|
|
struct scatterlist *sg = NULL;
|
|
int nsegs = 0;
|
|
|
|
if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
|
|
nsegs = __blk_bvec_map_sg(q, rq->special_vec, sglist, &sg);
|
|
else if (rq->bio && bio_op(rq->bio) == REQ_OP_WRITE_SAME)
|
|
nsegs = __blk_bvec_map_sg(q, bio_iovec(rq->bio), sglist, &sg);
|
|
else if (rq->bio)
|
|
nsegs = __blk_bios_map_sg(q, rq->bio, sglist, &sg);
|
|
|
|
if (unlikely(rq->rq_flags & RQF_COPY_USER) &&
|
|
(blk_rq_bytes(rq) & q->dma_pad_mask)) {
|
|
unsigned int pad_len =
|
|
(q->dma_pad_mask & ~blk_rq_bytes(rq)) + 1;
|
|
|
|
sg->length += pad_len;
|
|
rq->extra_len += pad_len;
|
|
}
|
|
|
|
if (q->dma_drain_size && q->dma_drain_needed(rq)) {
|
|
if (op_is_write(req_op(rq)))
|
|
memset(q->dma_drain_buffer, 0, q->dma_drain_size);
|
|
|
|
sg_unmark_end(sg);
|
|
sg = sg_next(sg);
|
|
sg_set_page(sg, virt_to_page(q->dma_drain_buffer),
|
|
q->dma_drain_size,
|
|
((unsigned long)q->dma_drain_buffer) &
|
|
(PAGE_SIZE - 1));
|
|
nsegs++;
|
|
rq->extra_len += q->dma_drain_size;
|
|
}
|
|
|
|
if (sg)
|
|
sg_mark_end(sg);
|
|
|
|
/*
|
|
* Something must have been wrong if the figured number of
|
|
* segment is bigger than number of req's physical segments
|
|
*/
|
|
WARN_ON(nsegs > blk_rq_nr_phys_segments(rq));
|
|
|
|
return nsegs;
|
|
}
|
|
EXPORT_SYMBOL(blk_rq_map_sg);
|
|
|
|
static inline int ll_new_hw_segment(struct request_queue *q,
|
|
struct request *req,
|
|
struct bio *bio)
|
|
{
|
|
int nr_phys_segs = bio_phys_segments(q, bio);
|
|
|
|
if (req->nr_phys_segments + nr_phys_segs > queue_max_segments(q))
|
|
goto no_merge;
|
|
|
|
if (blk_integrity_merge_bio(q, req, bio) == false)
|
|
goto no_merge;
|
|
|
|
/*
|
|
* This will form the start of a new hw segment. Bump both
|
|
* counters.
|
|
*/
|
|
req->nr_phys_segments += nr_phys_segs;
|
|
return 1;
|
|
|
|
no_merge:
|
|
req_set_nomerge(q, req);
|
|
return 0;
|
|
}
|
|
|
|
int ll_back_merge_fn(struct request_queue *q, struct request *req,
|
|
struct bio *bio)
|
|
{
|
|
if (req_gap_back_merge(req, bio))
|
|
return 0;
|
|
if (blk_integrity_rq(req) &&
|
|
integrity_req_gap_back_merge(req, bio))
|
|
return 0;
|
|
if (blk_rq_sectors(req) + bio_sectors(bio) >
|
|
blk_rq_get_max_sectors(req, blk_rq_pos(req))) {
|
|
req_set_nomerge(q, req);
|
|
return 0;
|
|
}
|
|
if (!bio_flagged(req->biotail, BIO_SEG_VALID))
|
|
blk_recount_segments(q, req->biotail);
|
|
if (!bio_flagged(bio, BIO_SEG_VALID))
|
|
blk_recount_segments(q, bio);
|
|
|
|
return ll_new_hw_segment(q, req, bio);
|
|
}
|
|
|
|
int ll_front_merge_fn(struct request_queue *q, struct request *req,
|
|
struct bio *bio)
|
|
{
|
|
|
|
if (req_gap_front_merge(req, bio))
|
|
return 0;
|
|
if (blk_integrity_rq(req) &&
|
|
integrity_req_gap_front_merge(req, bio))
|
|
return 0;
|
|
if (blk_rq_sectors(req) + bio_sectors(bio) >
|
|
blk_rq_get_max_sectors(req, bio->bi_iter.bi_sector)) {
|
|
req_set_nomerge(q, req);
|
|
return 0;
|
|
}
|
|
if (!bio_flagged(bio, BIO_SEG_VALID))
|
|
blk_recount_segments(q, bio);
|
|
if (!bio_flagged(req->bio, BIO_SEG_VALID))
|
|
blk_recount_segments(q, req->bio);
|
|
|
|
return ll_new_hw_segment(q, req, bio);
|
|
}
|
|
|
|
/*
|
|
* blk-mq uses req->special to carry normal driver per-request payload, it
|
|
* does not indicate a prepared command that we cannot merge with.
|
|
*/
|
|
static bool req_no_special_merge(struct request *req)
|
|
{
|
|
struct request_queue *q = req->q;
|
|
|
|
return !q->mq_ops && req->special;
|
|
}
|
|
|
|
static int ll_merge_requests_fn(struct request_queue *q, struct request *req,
|
|
struct request *next)
|
|
{
|
|
int total_phys_segments;
|
|
unsigned int seg_size =
|
|
req->biotail->bi_seg_back_size + next->bio->bi_seg_front_size;
|
|
|
|
/*
|
|
* First check if the either of the requests are re-queued
|
|
* requests. Can't merge them if they are.
|
|
*/
|
|
if (req_no_special_merge(req) || req_no_special_merge(next))
|
|
return 0;
|
|
|
|
if (req_gap_back_merge(req, next->bio))
|
|
return 0;
|
|
|
|
/*
|
|
* Will it become too large?
|
|
*/
|
|
if ((blk_rq_sectors(req) + blk_rq_sectors(next)) >
|
|
blk_rq_get_max_sectors(req, blk_rq_pos(req)))
|
|
return 0;
|
|
|
|
total_phys_segments = req->nr_phys_segments + next->nr_phys_segments;
|
|
if (blk_phys_contig_segment(q, req->biotail, next->bio)) {
|
|
if (req->nr_phys_segments == 1)
|
|
req->bio->bi_seg_front_size = seg_size;
|
|
if (next->nr_phys_segments == 1)
|
|
next->biotail->bi_seg_back_size = seg_size;
|
|
total_phys_segments--;
|
|
}
|
|
|
|
if (total_phys_segments > queue_max_segments(q))
|
|
return 0;
|
|
|
|
if (blk_integrity_merge_rq(q, req, next) == false)
|
|
return 0;
|
|
|
|
/* Merge is OK... */
|
|
req->nr_phys_segments = total_phys_segments;
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* blk_rq_set_mixed_merge - mark a request as mixed merge
|
|
* @rq: request to mark as mixed merge
|
|
*
|
|
* Description:
|
|
* @rq is about to be mixed merged. Make sure the attributes
|
|
* which can be mixed are set in each bio and mark @rq as mixed
|
|
* merged.
|
|
*/
|
|
void blk_rq_set_mixed_merge(struct request *rq)
|
|
{
|
|
unsigned int ff = rq->cmd_flags & REQ_FAILFAST_MASK;
|
|
struct bio *bio;
|
|
|
|
if (rq->rq_flags & RQF_MIXED_MERGE)
|
|
return;
|
|
|
|
/*
|
|
* @rq will no longer represent mixable attributes for all the
|
|
* contained bios. It will just track those of the first one.
|
|
* Distributes the attributs to each bio.
|
|
*/
|
|
for (bio = rq->bio; bio; bio = bio->bi_next) {
|
|
WARN_ON_ONCE((bio->bi_opf & REQ_FAILFAST_MASK) &&
|
|
(bio->bi_opf & REQ_FAILFAST_MASK) != ff);
|
|
bio->bi_opf |= ff;
|
|
}
|
|
rq->rq_flags |= RQF_MIXED_MERGE;
|
|
}
|
|
|
|
static void blk_account_io_merge(struct request *req)
|
|
{
|
|
if (blk_do_io_stat(req)) {
|
|
struct hd_struct *part;
|
|
int cpu;
|
|
|
|
cpu = part_stat_lock();
|
|
part = req->part;
|
|
|
|
part_round_stats(req->q, cpu, part);
|
|
part_dec_in_flight(req->q, part, rq_data_dir(req));
|
|
|
|
hd_struct_put(part);
|
|
part_stat_unlock();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* For non-mq, this has to be called with the request spinlock acquired.
|
|
* For mq with scheduling, the appropriate queue wide lock should be held.
|
|
*/
|
|
static struct request *attempt_merge(struct request_queue *q,
|
|
struct request *req, struct request *next)
|
|
{
|
|
if (!q->mq_ops)
|
|
lockdep_assert_held(q->queue_lock);
|
|
|
|
if (!rq_mergeable(req) || !rq_mergeable(next))
|
|
return NULL;
|
|
|
|
if (req_op(req) != req_op(next))
|
|
return NULL;
|
|
|
|
/*
|
|
* not contiguous
|
|
*/
|
|
if (blk_rq_pos(req) + blk_rq_sectors(req) != blk_rq_pos(next))
|
|
return NULL;
|
|
|
|
if (rq_data_dir(req) != rq_data_dir(next)
|
|
|| req->rq_disk != next->rq_disk
|
|
|| req_no_special_merge(next))
|
|
return NULL;
|
|
|
|
if (req_op(req) == REQ_OP_WRITE_SAME &&
|
|
!blk_write_same_mergeable(req->bio, next->bio))
|
|
return NULL;
|
|
|
|
/*
|
|
* Don't allow merge of different write hints, or for a hint with
|
|
* non-hint IO.
|
|
*/
|
|
if (req->write_hint != next->write_hint)
|
|
return NULL;
|
|
|
|
/*
|
|
* If we are allowed to merge, then append bio list
|
|
* from next to rq and release next. merge_requests_fn
|
|
* will have updated segment counts, update sector
|
|
* counts here.
|
|
*/
|
|
if (!ll_merge_requests_fn(q, req, next))
|
|
return NULL;
|
|
|
|
/*
|
|
* If failfast settings disagree or any of the two is already
|
|
* a mixed merge, mark both as mixed before proceeding. This
|
|
* makes sure that all involved bios have mixable attributes
|
|
* set properly.
|
|
*/
|
|
if (((req->rq_flags | next->rq_flags) & RQF_MIXED_MERGE) ||
|
|
(req->cmd_flags & REQ_FAILFAST_MASK) !=
|
|
(next->cmd_flags & REQ_FAILFAST_MASK)) {
|
|
blk_rq_set_mixed_merge(req);
|
|
blk_rq_set_mixed_merge(next);
|
|
}
|
|
|
|
/*
|
|
* At this point we have either done a back merge
|
|
* or front merge. We need the smaller start_time of
|
|
* the merged requests to be the current request
|
|
* for accounting purposes.
|
|
*/
|
|
if (time_after(req->start_time, next->start_time))
|
|
req->start_time = next->start_time;
|
|
|
|
req->biotail->bi_next = next->bio;
|
|
req->biotail = next->biotail;
|
|
|
|
req->__data_len += blk_rq_bytes(next);
|
|
|
|
elv_merge_requests(q, req, next);
|
|
|
|
/*
|
|
* 'next' is going away, so update stats accordingly
|
|
*/
|
|
blk_account_io_merge(next);
|
|
|
|
req->ioprio = ioprio_best(req->ioprio, next->ioprio);
|
|
if (blk_rq_cpu_valid(next))
|
|
req->cpu = next->cpu;
|
|
|
|
/*
|
|
* ownership of bio passed from next to req, return 'next' for
|
|
* the caller to free
|
|
*/
|
|
next->bio = NULL;
|
|
return next;
|
|
}
|
|
|
|
struct request *attempt_back_merge(struct request_queue *q, struct request *rq)
|
|
{
|
|
struct request *next = elv_latter_request(q, rq);
|
|
|
|
if (next)
|
|
return attempt_merge(q, rq, next);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
struct request *attempt_front_merge(struct request_queue *q, struct request *rq)
|
|
{
|
|
struct request *prev = elv_former_request(q, rq);
|
|
|
|
if (prev)
|
|
return attempt_merge(q, prev, rq);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int blk_attempt_req_merge(struct request_queue *q, struct request *rq,
|
|
struct request *next)
|
|
{
|
|
struct elevator_queue *e = q->elevator;
|
|
struct request *free;
|
|
|
|
if (!e->uses_mq && e->type->ops.sq.elevator_allow_rq_merge_fn)
|
|
if (!e->type->ops.sq.elevator_allow_rq_merge_fn(q, rq, next))
|
|
return 0;
|
|
|
|
free = attempt_merge(q, rq, next);
|
|
if (free) {
|
|
__blk_put_request(q, free);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
bool blk_rq_merge_ok(struct request *rq, struct bio *bio)
|
|
{
|
|
if (!rq_mergeable(rq) || !bio_mergeable(bio))
|
|
return false;
|
|
|
|
if (req_op(rq) != bio_op(bio))
|
|
return false;
|
|
|
|
/* different data direction or already started, don't merge */
|
|
if (bio_data_dir(bio) != rq_data_dir(rq))
|
|
return false;
|
|
|
|
/* must be same device and not a special request */
|
|
if (rq->rq_disk != bio->bi_disk || req_no_special_merge(rq))
|
|
return false;
|
|
|
|
/* only merge integrity protected bio into ditto rq */
|
|
if (blk_integrity_merge_bio(rq->q, rq, bio) == false)
|
|
return false;
|
|
|
|
/* must be using the same buffer */
|
|
if (req_op(rq) == REQ_OP_WRITE_SAME &&
|
|
!blk_write_same_mergeable(rq->bio, bio))
|
|
return false;
|
|
|
|
/*
|
|
* Don't allow merge of different write hints, or for a hint with
|
|
* non-hint IO.
|
|
*/
|
|
if (rq->write_hint != bio->bi_write_hint)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
enum elv_merge blk_try_merge(struct request *rq, struct bio *bio)
|
|
{
|
|
if (req_op(rq) == REQ_OP_DISCARD &&
|
|
queue_max_discard_segments(rq->q) > 1)
|
|
return ELEVATOR_DISCARD_MERGE;
|
|
else if (blk_rq_pos(rq) + blk_rq_sectors(rq) == bio->bi_iter.bi_sector)
|
|
return ELEVATOR_BACK_MERGE;
|
|
else if (blk_rq_pos(rq) - bio_sectors(bio) == bio->bi_iter.bi_sector)
|
|
return ELEVATOR_FRONT_MERGE;
|
|
return ELEVATOR_NO_MERGE;
|
|
}
|