mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-11-08 02:19:51 +01:00
Kent Overstreet
4f024f3797
Immutable biovecs are going to require an explicit iterator. To implement immutable bvecs, a later patch is going to add a bi_bvec_done member to this struct; for now, this patch effectively just renames things. Signed-off-by: Kent Overstreet <[email protected]> Cc: Jens Axboe <[email protected]> Cc: Geert Uytterhoeven <[email protected]> Cc: Benjamin Herrenschmidt <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: "Ed L. Cashin" <[email protected]> Cc: Nick Piggin <[email protected]> Cc: Lars Ellenberg <[email protected]> Cc: Jiri Kosina <[email protected]> Cc: Matthew Wilcox <[email protected]> Cc: Geoff Levand <[email protected]> Cc: Yehuda Sadeh <[email protected]> Cc: Sage Weil <[email protected]> Cc: Alex Elder <[email protected]> Cc: [email protected] Cc: Joshua Morris <[email protected]> Cc: Philip Kelleher <[email protected]> Cc: Rusty Russell <[email protected]> Cc: "Michael S. Tsirkin" <[email protected]> Cc: Konrad Rzeszutek Wilk <[email protected]> Cc: Jeremy Fitzhardinge <[email protected]> Cc: Neil Brown <[email protected]> Cc: Alasdair Kergon <[email protected]> Cc: Mike Snitzer <[email protected]> Cc: [email protected] Cc: Martin Schwidefsky <[email protected]> Cc: Heiko Carstens <[email protected]> Cc: [email protected] Cc: Boaz Harrosh <[email protected]> Cc: Benny Halevy <[email protected]> Cc: "James E.J. Bottomley" <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> Cc: "Nicholas A. Bellinger" <[email protected]> Cc: Alexander Viro <[email protected]> Cc: Chris Mason <[email protected]> Cc: "Theodore Ts'o" <[email protected]> Cc: Andreas Dilger <[email protected]> Cc: Jaegeuk Kim <[email protected]> Cc: Steven Whitehouse <[email protected]> Cc: Dave Kleikamp <[email protected]> Cc: Joern Engel <[email protected]> Cc: Prasad Joshi <[email protected]> Cc: Trond Myklebust <[email protected]> Cc: KONISHI Ryusuke <[email protected]> Cc: Mark Fasheh <[email protected]> Cc: Joel Becker <[email protected]> Cc: Ben Myers <[email protected]> Cc: [email protected] Cc: Steven Rostedt <[email protected]> Cc: Frederic Weisbecker <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Len Brown <[email protected]> Cc: Pavel Machek <[email protected]> Cc: "Rafael J. Wysocki" <[email protected]> Cc: Herton Ronaldo Krzesinski <[email protected]> Cc: Ben Hutchings <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Guo Chao <[email protected]> Cc: Tejun Heo <[email protected]> Cc: Asai Thambi S P <[email protected]> Cc: Selvan Mani <[email protected]> Cc: Sam Bradshaw <[email protected]> Cc: Wei Yongjun <[email protected]> Cc: "Roger Pau Monné" <[email protected]> Cc: Jan Beulich <[email protected]> Cc: Stefano Stabellini <[email protected]> Cc: Ian Campbell <[email protected]> Cc: Sebastian Ott <[email protected]> Cc: Christian Borntraeger <[email protected]> Cc: Minchan Kim <[email protected]> Cc: Jiang Liu <[email protected]> Cc: Nitin Gupta <[email protected]> Cc: Jerome Marchand <[email protected]> Cc: Joe Perches <[email protected]> Cc: Peng Tao <[email protected]> Cc: Andy Adamson <[email protected]> Cc: fanchaoting <[email protected]> Cc: Jie Liu <[email protected]> Cc: Sunil Mushran <[email protected]> Cc: "Martin K. Petersen" <[email protected]> Cc: Namjae Jeon <[email protected]> Cc: Pankaj Kumar <[email protected]> Cc: Dan Magenheimer <[email protected]> Cc: Mel Gorman <[email protected]>6
91 lines
2.0 KiB
C
91 lines
2.0 KiB
C
#ifndef _BCACHE_WRITEBACK_H
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#define _BCACHE_WRITEBACK_H
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#define CUTOFF_WRITEBACK 40
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#define CUTOFF_WRITEBACK_SYNC 70
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static inline uint64_t bcache_dev_sectors_dirty(struct bcache_device *d)
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{
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uint64_t i, ret = 0;
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for (i = 0; i < d->nr_stripes; i++)
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ret += atomic_read(d->stripe_sectors_dirty + i);
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return ret;
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}
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static inline unsigned offset_to_stripe(struct bcache_device *d,
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uint64_t offset)
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{
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do_div(offset, d->stripe_size);
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return offset;
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}
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static inline bool bcache_dev_stripe_dirty(struct cached_dev *dc,
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uint64_t offset,
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unsigned nr_sectors)
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{
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unsigned stripe = offset_to_stripe(&dc->disk, offset);
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while (1) {
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if (atomic_read(dc->disk.stripe_sectors_dirty + stripe))
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return true;
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if (nr_sectors <= dc->disk.stripe_size)
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return false;
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nr_sectors -= dc->disk.stripe_size;
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stripe++;
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}
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}
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static inline bool should_writeback(struct cached_dev *dc, struct bio *bio,
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unsigned cache_mode, bool would_skip)
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{
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unsigned in_use = dc->disk.c->gc_stats.in_use;
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if (cache_mode != CACHE_MODE_WRITEBACK ||
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test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags) ||
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in_use > CUTOFF_WRITEBACK_SYNC)
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return false;
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if (dc->partial_stripes_expensive &&
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bcache_dev_stripe_dirty(dc, bio->bi_iter.bi_sector,
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bio_sectors(bio)))
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return true;
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if (would_skip)
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return false;
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return bio->bi_rw & REQ_SYNC ||
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in_use <= CUTOFF_WRITEBACK;
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}
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static inline void bch_writeback_queue(struct cached_dev *dc)
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{
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wake_up_process(dc->writeback_thread);
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}
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static inline void bch_writeback_add(struct cached_dev *dc)
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{
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if (!atomic_read(&dc->has_dirty) &&
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!atomic_xchg(&dc->has_dirty, 1)) {
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atomic_inc(&dc->count);
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if (BDEV_STATE(&dc->sb) != BDEV_STATE_DIRTY) {
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SET_BDEV_STATE(&dc->sb, BDEV_STATE_DIRTY);
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/* XXX: should do this synchronously */
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bch_write_bdev_super(dc, NULL);
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}
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bch_writeback_queue(dc);
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}
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}
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void bcache_dev_sectors_dirty_add(struct cache_set *, unsigned, uint64_t, int);
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void bch_sectors_dirty_init(struct cached_dev *dc);
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int bch_cached_dev_writeback_init(struct cached_dev *);
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#endif
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