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a92ce0feff
As suggested by Neil Brown[1], this limitation seems to be deprecated. With plugging in use, writes are processed behind the raid thread and conf->pending_count is not increased. This limitation occurs only if caller doesn't use plugs. It can be avoided and often it is (with plugging). There are no reports that queue is growing to enormous size so remove queue limitation for non-plugged IOs too. [1] https://lore.kernel.org/linux-raid/162496301481.7211.18031090130574610495@noble.neil.brown.name Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com> Signed-off-by: Song Liu <song@kernel.org>
106 lines
2.5 KiB
C
106 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Maximum size of each resync request */
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#define RESYNC_BLOCK_SIZE (64*1024)
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#define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE)
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/*
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* Number of guaranteed raid bios in case of extreme VM load:
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*/
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#define NR_RAID_BIOS 256
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/* when we get a read error on a read-only array, we redirect to another
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* device without failing the first device, or trying to over-write to
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* correct the read error. To keep track of bad blocks on a per-bio
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* level, we store IO_BLOCKED in the appropriate 'bios' pointer
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*/
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#define IO_BLOCKED ((struct bio *)1)
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/* When we successfully write to a known bad-block, we need to remove the
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* bad-block marking which must be done from process context. So we record
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* the success by setting devs[n].bio to IO_MADE_GOOD
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*/
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#define IO_MADE_GOOD ((struct bio *)2)
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#define BIO_SPECIAL(bio) ((unsigned long)bio <= 2)
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/* for managing resync I/O pages */
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struct resync_pages {
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void *raid_bio;
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struct page *pages[RESYNC_PAGES];
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};
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static void rbio_pool_free(void *rbio, void *data)
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{
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kfree(rbio);
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}
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static inline int resync_alloc_pages(struct resync_pages *rp,
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gfp_t gfp_flags)
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{
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int i;
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for (i = 0; i < RESYNC_PAGES; i++) {
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rp->pages[i] = alloc_page(gfp_flags);
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if (!rp->pages[i])
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goto out_free;
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}
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return 0;
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out_free:
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while (--i >= 0)
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put_page(rp->pages[i]);
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return -ENOMEM;
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}
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static inline void resync_free_pages(struct resync_pages *rp)
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{
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int i;
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for (i = 0; i < RESYNC_PAGES; i++)
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put_page(rp->pages[i]);
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}
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static inline void resync_get_all_pages(struct resync_pages *rp)
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{
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int i;
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for (i = 0; i < RESYNC_PAGES; i++)
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get_page(rp->pages[i]);
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}
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static inline struct page *resync_fetch_page(struct resync_pages *rp,
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unsigned idx)
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{
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if (WARN_ON_ONCE(idx >= RESYNC_PAGES))
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return NULL;
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return rp->pages[idx];
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}
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/*
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* 'strct resync_pages' stores actual pages used for doing the resync
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* IO, and it is per-bio, so make .bi_private points to it.
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*/
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static inline struct resync_pages *get_resync_pages(struct bio *bio)
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{
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return bio->bi_private;
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}
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/* generally called after bio_reset() for reseting bvec */
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static void md_bio_reset_resync_pages(struct bio *bio, struct resync_pages *rp,
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int size)
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{
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int idx = 0;
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/* initialize bvec table again */
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do {
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struct page *page = resync_fetch_page(rp, idx);
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int len = min_t(int, size, PAGE_SIZE);
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/*
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* won't fail because the vec table is big
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* enough to hold all these pages
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*/
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bio_add_page(bio, page, len, 0);
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size -= len;
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} while (idx++ < RESYNC_PAGES && size > 0);
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}
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