^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * page.c - buffer/page management specific to NILFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Written by Ryusuke Konishi and Seiji Kihara.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/writeback.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/swap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/bitops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/page-flags.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/highmem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/pagevec.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/gfp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include "nilfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include "page.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include "mdt.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define NILFS_BUFFER_INHERENT_BITS \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) (BIT(BH_Uptodate) | BIT(BH_Mapped) | BIT(BH_NILFS_Node) | \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) BIT(BH_NILFS_Volatile) | BIT(BH_NILFS_Checked))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static struct buffer_head *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) __nilfs_get_page_block(struct page *page, unsigned long block, pgoff_t index,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) int blkbits, unsigned long b_state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) unsigned long first_block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) if (!page_has_buffers(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) create_empty_buffers(page, 1 << blkbits, b_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) first_block = (unsigned long)index << (PAGE_SHIFT - blkbits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) bh = nilfs_page_get_nth_block(page, block - first_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) touch_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) wait_on_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) return bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) struct buffer_head *nilfs_grab_buffer(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) struct address_space *mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) unsigned long blkoff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) unsigned long b_state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) int blkbits = inode->i_blkbits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) pgoff_t index = blkoff >> (PAGE_SHIFT - blkbits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) page = grab_cache_page(mapping, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) if (unlikely(!page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) bh = __nilfs_get_page_block(page, blkoff, index, blkbits, b_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) if (unlikely(!bh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) return bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * nilfs_forget_buffer - discard dirty state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * @bh: buffer head of the buffer to be discarded
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) void nilfs_forget_buffer(struct buffer_head *bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) struct page *page = bh->b_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) const unsigned long clear_bits =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) (BIT(BH_Uptodate) | BIT(BH_Dirty) | BIT(BH_Mapped) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) BIT(BH_Async_Write) | BIT(BH_NILFS_Volatile) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) BIT(BH_NILFS_Checked) | BIT(BH_NILFS_Redirected));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) lock_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) set_mask_bits(&bh->b_state, clear_bits, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (nilfs_page_buffers_clean(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) __nilfs_clear_page_dirty(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) bh->b_blocknr = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) ClearPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) ClearPageMappedToDisk(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) unlock_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * nilfs_copy_buffer -- copy buffer data and flags
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * @dbh: destination buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * @sbh: source buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) void nilfs_copy_buffer(struct buffer_head *dbh, struct buffer_head *sbh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) void *kaddr0, *kaddr1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) unsigned long bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) struct page *spage = sbh->b_page, *dpage = dbh->b_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) kaddr0 = kmap_atomic(spage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) kaddr1 = kmap_atomic(dpage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) memcpy(kaddr1 + bh_offset(dbh), kaddr0 + bh_offset(sbh), sbh->b_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) kunmap_atomic(kaddr1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) kunmap_atomic(kaddr0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) dbh->b_state = sbh->b_state & NILFS_BUFFER_INHERENT_BITS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) dbh->b_blocknr = sbh->b_blocknr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) dbh->b_bdev = sbh->b_bdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) bh = dbh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) bits = sbh->b_state & (BIT(BH_Uptodate) | BIT(BH_Mapped));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) while ((bh = bh->b_this_page) != dbh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) lock_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) bits &= bh->b_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) unlock_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (bits & BIT(BH_Uptodate))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) SetPageUptodate(dpage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) ClearPageUptodate(dpage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) if (bits & BIT(BH_Mapped))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) SetPageMappedToDisk(dpage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) ClearPageMappedToDisk(dpage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) * nilfs_page_buffers_clean - check if a page has dirty buffers or not.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) * @page: page to be checked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) * nilfs_page_buffers_clean() returns zero if the page has dirty buffers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) * Otherwise, it returns non-zero value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) int nilfs_page_buffers_clean(struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) struct buffer_head *bh, *head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) bh = head = page_buffers(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) if (buffer_dirty(bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) bh = bh->b_this_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) } while (bh != head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) void nilfs_page_bug(struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) struct address_space *m;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) unsigned long ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) if (unlikely(!page)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) printk(KERN_CRIT "NILFS_PAGE_BUG(NULL)\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) m = page->mapping;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) ino = m ? m->host->i_ino : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) printk(KERN_CRIT "NILFS_PAGE_BUG(%p): cnt=%d index#=%llu flags=0x%lx "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) "mapping=%p ino=%lu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) page, page_ref_count(page),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) (unsigned long long)page->index, page->flags, m, ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) if (page_has_buffers(page)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) struct buffer_head *bh, *head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) int i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) bh = head = page_buffers(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) printk(KERN_CRIT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) " BH[%d] %p: cnt=%d block#=%llu state=0x%lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) i++, bh, atomic_read(&bh->b_count),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) (unsigned long long)bh->b_blocknr, bh->b_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) bh = bh->b_this_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) } while (bh != head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) * nilfs_copy_page -- copy the page with buffers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) * @dst: destination page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) * @src: source page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) * @copy_dirty: flag whether to copy dirty states on the page's buffer heads.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) * This function is for both data pages and btnode pages. The dirty flag
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) * should be treated by caller. The page must not be under i/o.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) * Both src and dst page must be locked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) static void nilfs_copy_page(struct page *dst, struct page *src, int copy_dirty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) struct buffer_head *dbh, *dbufs, *sbh, *sbufs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) unsigned long mask = NILFS_BUFFER_INHERENT_BITS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) BUG_ON(PageWriteback(dst));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) sbh = sbufs = page_buffers(src);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) if (!page_has_buffers(dst))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) create_empty_buffers(dst, sbh->b_size, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) if (copy_dirty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) mask |= BIT(BH_Dirty);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) dbh = dbufs = page_buffers(dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) lock_buffer(sbh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) lock_buffer(dbh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) dbh->b_state = sbh->b_state & mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) dbh->b_blocknr = sbh->b_blocknr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) dbh->b_bdev = sbh->b_bdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) sbh = sbh->b_this_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) dbh = dbh->b_this_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) } while (dbh != dbufs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) copy_highpage(dst, src);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) if (PageUptodate(src) && !PageUptodate(dst))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) SetPageUptodate(dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) else if (!PageUptodate(src) && PageUptodate(dst))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) ClearPageUptodate(dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) if (PageMappedToDisk(src) && !PageMappedToDisk(dst))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) SetPageMappedToDisk(dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) else if (!PageMappedToDisk(src) && PageMappedToDisk(dst))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) ClearPageMappedToDisk(dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) unlock_buffer(sbh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) unlock_buffer(dbh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) sbh = sbh->b_this_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) dbh = dbh->b_this_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) } while (dbh != dbufs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) int nilfs_copy_dirty_pages(struct address_space *dmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) struct address_space *smap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) struct pagevec pvec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) pgoff_t index = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) pagevec_init(&pvec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) repeat:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) if (!pagevec_lookup_tag(&pvec, smap, &index, PAGECACHE_TAG_DIRTY))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) for (i = 0; i < pagevec_count(&pvec); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) struct page *page = pvec.pages[i], *dpage;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) lock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) if (unlikely(!PageDirty(page)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) NILFS_PAGE_BUG(page, "inconsistent dirty state");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) dpage = grab_cache_page(dmap, page->index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) if (unlikely(!dpage)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) /* No empty page is added to the page cache */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) if (unlikely(!page_has_buffers(page)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) NILFS_PAGE_BUG(page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) "found empty page in dat page cache");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) nilfs_copy_page(dpage, page, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) __set_page_dirty_nobuffers(dpage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) unlock_page(dpage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) put_page(dpage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) pagevec_release(&pvec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) if (likely(!err))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) goto repeat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) * nilfs_copy_back_pages -- copy back pages to original cache from shadow cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) * @dmap: destination page cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) * @smap: source page cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) * No pages must be added to the cache during this process.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) * This must be ensured by the caller.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) void nilfs_copy_back_pages(struct address_space *dmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) struct address_space *smap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) struct pagevec pvec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) unsigned int i, n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) pgoff_t index = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) pagevec_init(&pvec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) repeat:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) n = pagevec_lookup(&pvec, smap, &index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) if (!n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) for (i = 0; i < pagevec_count(&pvec); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) struct page *page = pvec.pages[i], *dpage;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) pgoff_t offset = page->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) lock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) dpage = find_lock_page(dmap, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) if (dpage) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) /* overwrite existing page in the destination cache */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) WARN_ON(PageDirty(dpage));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) nilfs_copy_page(dpage, page, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) unlock_page(dpage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) put_page(dpage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) /* Do we not need to remove page from smap here? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) struct page *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) /* move the page to the destination cache */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) xa_lock_irq(&smap->i_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) p = __xa_erase(&smap->i_pages, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) WARN_ON(page != p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) smap->nrpages--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) xa_unlock_irq(&smap->i_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) xa_lock_irq(&dmap->i_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) p = __xa_store(&dmap->i_pages, offset, page, GFP_NOFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) if (unlikely(p)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) /* Probably -ENOMEM */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) page->mapping = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) page->mapping = dmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) dmap->nrpages++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) if (PageDirty(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) __xa_set_mark(&dmap->i_pages, offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) PAGECACHE_TAG_DIRTY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) xa_unlock_irq(&dmap->i_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) pagevec_release(&pvec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) goto repeat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) * nilfs_clear_dirty_pages - discard dirty pages in address space
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) * @mapping: address space with dirty pages for discarding
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) * @silent: suppress [true] or print [false] warning messages
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) void nilfs_clear_dirty_pages(struct address_space *mapping, bool silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) struct pagevec pvec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) pgoff_t index = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) pagevec_init(&pvec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) while (pagevec_lookup_tag(&pvec, mapping, &index,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) PAGECACHE_TAG_DIRTY)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) for (i = 0; i < pagevec_count(&pvec); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) struct page *page = pvec.pages[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) lock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) nilfs_clear_dirty_page(page, silent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) pagevec_release(&pvec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) * nilfs_clear_dirty_page - discard dirty page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) * @page: dirty page that will be discarded
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) * @silent: suppress [true] or print [false] warning messages
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) void nilfs_clear_dirty_page(struct page *page, bool silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) struct inode *inode = page->mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) BUG_ON(!PageLocked(page));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) if (!silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) nilfs_warn(sb, "discard dirty page: offset=%lld, ino=%lu",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) page_offset(page), inode->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) ClearPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) ClearPageMappedToDisk(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) if (page_has_buffers(page)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) struct buffer_head *bh, *head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) const unsigned long clear_bits =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) (BIT(BH_Uptodate) | BIT(BH_Dirty) | BIT(BH_Mapped) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) BIT(BH_Async_Write) | BIT(BH_NILFS_Volatile) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) BIT(BH_NILFS_Checked) | BIT(BH_NILFS_Redirected));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) bh = head = page_buffers(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) lock_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) if (!silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) nilfs_warn(sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) "discard dirty block: blocknr=%llu, size=%zu",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) (u64)bh->b_blocknr, bh->b_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) set_mask_bits(&bh->b_state, clear_bits, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) unlock_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) } while (bh = bh->b_this_page, bh != head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) __nilfs_clear_page_dirty(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) unsigned int nilfs_page_count_clean_buffers(struct page *page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) unsigned int from, unsigned int to)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) unsigned int block_start, block_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) struct buffer_head *bh, *head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) unsigned int nc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) for (bh = head = page_buffers(page), block_start = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) bh != head || !block_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) block_start = block_end, bh = bh->b_this_page) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) block_end = block_start + bh->b_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) if (block_end > from && block_start < to && !buffer_dirty(bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) nc++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) return nc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) void nilfs_mapping_init(struct address_space *mapping, struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) mapping->host = inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) mapping->flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) mapping_set_gfp_mask(mapping, GFP_NOFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) mapping->private_data = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) mapping->a_ops = &empty_aops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) * NILFS2 needs clear_page_dirty() in the following two cases:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) * 1) For B-tree node pages and data pages of the dat/gcdat, NILFS2 clears
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) * page dirty flags when it copies back pages from the shadow cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) * (gcdat->{i_mapping,i_btnode_cache}) to its original cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) * (dat->{i_mapping,i_btnode_cache}).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) * 2) Some B-tree operations like insertion or deletion may dispose buffers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) * in dirty state, and this needs to cancel the dirty state of their pages.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) int __nilfs_clear_page_dirty(struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) struct address_space *mapping = page->mapping;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) if (mapping) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) xa_lock_irq(&mapping->i_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) if (test_bit(PG_dirty, &page->flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) __xa_clear_mark(&mapping->i_pages, page_index(page),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) PAGECACHE_TAG_DIRTY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) xa_unlock_irq(&mapping->i_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) return clear_page_dirty_for_io(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) xa_unlock_irq(&mapping->i_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) return TestClearPageDirty(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) * nilfs_find_uncommitted_extent - find extent of uncommitted data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) * @inode: inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) * @start_blk: start block offset (in)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) * @blkoff: start offset of the found extent (out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) * This function searches an extent of buffers marked "delayed" which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) * starts from a block offset equal to or larger than @start_blk. If
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) * such an extent was found, this will store the start offset in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) * @blkoff and return its length in blocks. Otherwise, zero is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) * returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) unsigned long nilfs_find_uncommitted_extent(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) sector_t start_blk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) sector_t *blkoff)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) pgoff_t index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) unsigned int nblocks_in_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) unsigned long length = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) sector_t b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) struct pagevec pvec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) if (inode->i_mapping->nrpages == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) index = start_blk >> (PAGE_SHIFT - inode->i_blkbits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) nblocks_in_page = 1U << (PAGE_SHIFT - inode->i_blkbits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) pagevec_init(&pvec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) repeat:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) pvec.nr = find_get_pages_contig(inode->i_mapping, index, PAGEVEC_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) pvec.pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) if (pvec.nr == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) return length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) if (length > 0 && pvec.pages[0]->index > index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) b = pvec.pages[0]->index << (PAGE_SHIFT - inode->i_blkbits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) page = pvec.pages[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) lock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) if (page_has_buffers(page)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) struct buffer_head *bh, *head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) bh = head = page_buffers(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) if (b < start_blk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) if (buffer_delay(bh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) if (length == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) *blkoff = b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) length++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) } else if (length > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) goto out_locked;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) } while (++b, bh = bh->b_this_page, bh != head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) if (length > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) goto out_locked;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) b += nblocks_in_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) } while (++i < pagevec_count(&pvec));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) index = page->index + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) pagevec_release(&pvec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) goto repeat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) out_locked:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) pagevec_release(&pvec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) return length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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