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548 lines
13 KiB
548 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
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* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. |
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*/ |
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#include <linux/sched.h> |
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#include <linux/slab.h> |
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#include <linux/spinlock.h> |
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#include <linux/completion.h> |
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#include <linux/buffer_head.h> |
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#include <linux/mm.h> |
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#include <linux/pagemap.h> |
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#include <linux/writeback.h> |
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#include <linux/swap.h> |
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#include <linux/delay.h> |
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#include <linux/bio.h> |
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#include <linux/gfs2_ondisk.h> |
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#include "gfs2.h" |
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#include "incore.h" |
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#include "glock.h" |
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#include "glops.h" |
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#include "inode.h" |
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#include "log.h" |
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#include "lops.h" |
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#include "meta_io.h" |
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#include "rgrp.h" |
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#include "trans.h" |
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#include "util.h" |
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#include "trace_gfs2.h" |
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static int gfs2_aspace_writepage(struct page *page, struct writeback_control *wbc) |
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{ |
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struct buffer_head *bh, *head; |
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int nr_underway = 0; |
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int write_flags = REQ_META | REQ_PRIO | wbc_to_write_flags(wbc); |
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BUG_ON(!PageLocked(page)); |
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BUG_ON(!page_has_buffers(page)); |
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head = page_buffers(page); |
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bh = head; |
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do { |
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if (!buffer_mapped(bh)) |
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continue; |
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/* |
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* If it's a fully non-blocking write attempt and we cannot |
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* lock the buffer then redirty the page. Note that this can |
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* potentially cause a busy-wait loop from flusher thread and kswapd |
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* activity, but those code paths have their own higher-level |
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* throttling. |
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*/ |
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if (wbc->sync_mode != WB_SYNC_NONE) { |
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lock_buffer(bh); |
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} else if (!trylock_buffer(bh)) { |
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redirty_page_for_writepage(wbc, page); |
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continue; |
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} |
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if (test_clear_buffer_dirty(bh)) { |
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mark_buffer_async_write(bh); |
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} else { |
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unlock_buffer(bh); |
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} |
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} while ((bh = bh->b_this_page) != head); |
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/* |
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* The page and its buffers are protected by PageWriteback(), so we can |
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* drop the bh refcounts early. |
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*/ |
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BUG_ON(PageWriteback(page)); |
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set_page_writeback(page); |
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do { |
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struct buffer_head *next = bh->b_this_page; |
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if (buffer_async_write(bh)) { |
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submit_bh(REQ_OP_WRITE, write_flags, bh); |
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nr_underway++; |
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} |
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bh = next; |
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} while (bh != head); |
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unlock_page(page); |
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if (nr_underway == 0) |
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end_page_writeback(page); |
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return 0; |
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} |
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const struct address_space_operations gfs2_meta_aops = { |
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.writepage = gfs2_aspace_writepage, |
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.releasepage = gfs2_releasepage, |
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}; |
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const struct address_space_operations gfs2_rgrp_aops = { |
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.writepage = gfs2_aspace_writepage, |
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.releasepage = gfs2_releasepage, |
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}; |
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/** |
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* gfs2_getbuf - Get a buffer with a given address space |
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* @gl: the glock |
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* @blkno: the block number (filesystem scope) |
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* @create: 1 if the buffer should be created |
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* |
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* Returns: the buffer |
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*/ |
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struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, int create) |
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{ |
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struct address_space *mapping = gfs2_glock2aspace(gl); |
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struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
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struct page *page; |
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struct buffer_head *bh; |
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unsigned int shift; |
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unsigned long index; |
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unsigned int bufnum; |
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if (mapping == NULL) |
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mapping = &sdp->sd_aspace; |
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shift = PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift; |
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index = blkno >> shift; /* convert block to page */ |
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bufnum = blkno - (index << shift); /* block buf index within page */ |
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if (create) { |
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for (;;) { |
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page = grab_cache_page(mapping, index); |
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if (page) |
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break; |
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yield(); |
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} |
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} else { |
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page = find_get_page_flags(mapping, index, |
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FGP_LOCK|FGP_ACCESSED); |
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if (!page) |
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return NULL; |
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} |
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if (!page_has_buffers(page)) |
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create_empty_buffers(page, sdp->sd_sb.sb_bsize, 0); |
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/* Locate header for our buffer within our page */ |
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for (bh = page_buffers(page); bufnum--; bh = bh->b_this_page) |
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/* Do nothing */; |
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get_bh(bh); |
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if (!buffer_mapped(bh)) |
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map_bh(bh, sdp->sd_vfs, blkno); |
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unlock_page(page); |
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put_page(page); |
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return bh; |
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} |
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static void meta_prep_new(struct buffer_head *bh) |
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{ |
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struct gfs2_meta_header *mh = (struct gfs2_meta_header *)bh->b_data; |
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lock_buffer(bh); |
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clear_buffer_dirty(bh); |
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set_buffer_uptodate(bh); |
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unlock_buffer(bh); |
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mh->mh_magic = cpu_to_be32(GFS2_MAGIC); |
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} |
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/** |
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* gfs2_meta_new - Get a block |
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* @gl: The glock associated with this block |
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* @blkno: The block number |
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* |
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* Returns: The buffer |
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*/ |
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struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno) |
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{ |
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struct buffer_head *bh; |
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bh = gfs2_getbuf(gl, blkno, CREATE); |
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meta_prep_new(bh); |
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return bh; |
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} |
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static void gfs2_meta_read_endio(struct bio *bio) |
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{ |
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struct bio_vec *bvec; |
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struct bvec_iter_all iter_all; |
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bio_for_each_segment_all(bvec, bio, iter_all) { |
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struct page *page = bvec->bv_page; |
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struct buffer_head *bh = page_buffers(page); |
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unsigned int len = bvec->bv_len; |
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while (bh_offset(bh) < bvec->bv_offset) |
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bh = bh->b_this_page; |
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do { |
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struct buffer_head *next = bh->b_this_page; |
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len -= bh->b_size; |
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bh->b_end_io(bh, !bio->bi_status); |
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bh = next; |
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} while (bh && len); |
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} |
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bio_put(bio); |
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} |
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/* |
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* Submit several consecutive buffer head I/O requests as a single bio I/O |
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* request. (See submit_bh_wbc.) |
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*/ |
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static void gfs2_submit_bhs(int op, int op_flags, struct buffer_head *bhs[], |
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int num) |
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{ |
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while (num > 0) { |
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struct buffer_head *bh = *bhs; |
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struct bio *bio; |
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bio = bio_alloc(GFP_NOIO, num); |
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bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9); |
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bio_set_dev(bio, bh->b_bdev); |
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while (num > 0) { |
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bh = *bhs; |
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if (!bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh))) { |
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BUG_ON(bio->bi_iter.bi_size == 0); |
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break; |
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} |
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bhs++; |
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num--; |
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} |
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bio->bi_end_io = gfs2_meta_read_endio; |
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bio_set_op_attrs(bio, op, op_flags); |
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submit_bio(bio); |
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} |
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} |
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/** |
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* gfs2_meta_read - Read a block from disk |
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* @gl: The glock covering the block |
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* @blkno: The block number |
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* @flags: flags |
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* @bhp: the place where the buffer is returned (NULL on failure) |
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* |
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* Returns: errno |
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*/ |
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int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags, |
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int rahead, struct buffer_head **bhp) |
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{ |
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struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
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struct buffer_head *bh, *bhs[2]; |
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int num = 0; |
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if (unlikely(gfs2_withdrawn(sdp)) && |
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(!sdp->sd_jdesc || gl != sdp->sd_jinode_gl)) { |
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*bhp = NULL; |
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return -EIO; |
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} |
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*bhp = bh = gfs2_getbuf(gl, blkno, CREATE); |
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lock_buffer(bh); |
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if (buffer_uptodate(bh)) { |
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unlock_buffer(bh); |
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flags &= ~DIO_WAIT; |
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} else { |
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bh->b_end_io = end_buffer_read_sync; |
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get_bh(bh); |
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bhs[num++] = bh; |
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} |
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if (rahead) { |
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bh = gfs2_getbuf(gl, blkno + 1, CREATE); |
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lock_buffer(bh); |
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if (buffer_uptodate(bh)) { |
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unlock_buffer(bh); |
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brelse(bh); |
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} else { |
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bh->b_end_io = end_buffer_read_sync; |
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bhs[num++] = bh; |
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} |
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} |
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gfs2_submit_bhs(REQ_OP_READ, REQ_META | REQ_PRIO, bhs, num); |
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if (!(flags & DIO_WAIT)) |
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return 0; |
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bh = *bhp; |
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wait_on_buffer(bh); |
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if (unlikely(!buffer_uptodate(bh))) { |
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struct gfs2_trans *tr = current->journal_info; |
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if (tr && test_bit(TR_TOUCHED, &tr->tr_flags)) |
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gfs2_io_error_bh_wd(sdp, bh); |
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brelse(bh); |
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*bhp = NULL; |
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return -EIO; |
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} |
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return 0; |
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} |
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/** |
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* gfs2_meta_wait - Reread a block from disk |
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* @sdp: the filesystem |
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* @bh: The block to wait for |
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* |
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* Returns: errno |
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*/ |
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int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh) |
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{ |
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if (unlikely(gfs2_withdrawn(sdp))) |
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return -EIO; |
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wait_on_buffer(bh); |
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if (!buffer_uptodate(bh)) { |
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struct gfs2_trans *tr = current->journal_info; |
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if (tr && test_bit(TR_TOUCHED, &tr->tr_flags)) |
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gfs2_io_error_bh_wd(sdp, bh); |
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return -EIO; |
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} |
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if (unlikely(gfs2_withdrawn(sdp))) |
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return -EIO; |
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return 0; |
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} |
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void gfs2_remove_from_journal(struct buffer_head *bh, int meta) |
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{ |
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struct address_space *mapping = bh->b_page->mapping; |
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struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); |
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struct gfs2_bufdata *bd = bh->b_private; |
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struct gfs2_trans *tr = current->journal_info; |
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int was_pinned = 0; |
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if (test_clear_buffer_pinned(bh)) { |
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trace_gfs2_pin(bd, 0); |
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atomic_dec(&sdp->sd_log_pinned); |
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list_del_init(&bd->bd_list); |
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if (meta == REMOVE_META) |
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tr->tr_num_buf_rm++; |
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else |
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tr->tr_num_databuf_rm++; |
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set_bit(TR_TOUCHED, &tr->tr_flags); |
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was_pinned = 1; |
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brelse(bh); |
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} |
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if (bd) { |
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if (bd->bd_tr) { |
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gfs2_trans_add_revoke(sdp, bd); |
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} else if (was_pinned) { |
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bh->b_private = NULL; |
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kmem_cache_free(gfs2_bufdata_cachep, bd); |
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} else if (!list_empty(&bd->bd_ail_st_list) && |
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!list_empty(&bd->bd_ail_gl_list)) { |
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gfs2_remove_from_ail(bd); |
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} |
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} |
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clear_buffer_dirty(bh); |
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clear_buffer_uptodate(bh); |
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} |
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/** |
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* gfs2_ail1_wipe - remove deleted/freed buffers from the ail1 list |
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* @sdp: superblock |
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* @bstart: starting block address of buffers to remove |
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* @blen: length of buffers to be removed |
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* |
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* This function is called from gfs2_journal wipe, whose job is to remove |
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* buffers, corresponding to deleted blocks, from the journal. If we find any |
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* bufdata elements on the system ail1 list, they haven't been written to |
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* the journal yet. So we remove them. |
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*/ |
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static void gfs2_ail1_wipe(struct gfs2_sbd *sdp, u64 bstart, u32 blen) |
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{ |
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struct gfs2_trans *tr, *s; |
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struct gfs2_bufdata *bd, *bs; |
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struct buffer_head *bh; |
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u64 end = bstart + blen; |
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gfs2_log_lock(sdp); |
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spin_lock(&sdp->sd_ail_lock); |
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list_for_each_entry_safe(tr, s, &sdp->sd_ail1_list, tr_list) { |
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list_for_each_entry_safe(bd, bs, &tr->tr_ail1_list, |
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bd_ail_st_list) { |
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bh = bd->bd_bh; |
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if (bh->b_blocknr < bstart || bh->b_blocknr >= end) |
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continue; |
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gfs2_remove_from_journal(bh, REMOVE_JDATA); |
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} |
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} |
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spin_unlock(&sdp->sd_ail_lock); |
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gfs2_log_unlock(sdp); |
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} |
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static struct buffer_head *gfs2_getjdatabuf(struct gfs2_inode *ip, u64 blkno) |
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{ |
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struct address_space *mapping = ip->i_inode.i_mapping; |
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struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
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struct page *page; |
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struct buffer_head *bh; |
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unsigned int shift = PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift; |
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unsigned long index = blkno >> shift; /* convert block to page */ |
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unsigned int bufnum = blkno - (index << shift); |
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page = find_get_page_flags(mapping, index, FGP_LOCK|FGP_ACCESSED); |
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if (!page) |
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return NULL; |
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if (!page_has_buffers(page)) { |
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unlock_page(page); |
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put_page(page); |
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return NULL; |
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} |
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/* Locate header for our buffer within our page */ |
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for (bh = page_buffers(page); bufnum--; bh = bh->b_this_page) |
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/* Do nothing */; |
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get_bh(bh); |
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unlock_page(page); |
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put_page(page); |
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return bh; |
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} |
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/** |
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* gfs2_journal_wipe - make inode's buffers so they aren't dirty/pinned anymore |
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* @ip: the inode who owns the buffers |
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* @bstart: the first buffer in the run |
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* @blen: the number of buffers in the run |
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* |
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*/ |
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void gfs2_journal_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen) |
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{ |
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struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
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struct buffer_head *bh; |
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int ty; |
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gfs2_ail1_wipe(sdp, bstart, blen); |
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while (blen) { |
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ty = REMOVE_META; |
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bh = gfs2_getbuf(ip->i_gl, bstart, NO_CREATE); |
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if (!bh && gfs2_is_jdata(ip)) { |
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bh = gfs2_getjdatabuf(ip, bstart); |
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ty = REMOVE_JDATA; |
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} |
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if (bh) { |
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lock_buffer(bh); |
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gfs2_log_lock(sdp); |
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spin_lock(&sdp->sd_ail_lock); |
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gfs2_remove_from_journal(bh, ty); |
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spin_unlock(&sdp->sd_ail_lock); |
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gfs2_log_unlock(sdp); |
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unlock_buffer(bh); |
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brelse(bh); |
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} |
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bstart++; |
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blen--; |
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} |
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} |
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/** |
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* gfs2_meta_indirect_buffer - Get a metadata buffer |
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* @ip: The GFS2 inode |
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* @height: The level of this buf in the metadata (indir addr) tree (if any) |
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* @num: The block number (device relative) of the buffer |
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* @bhp: the buffer is returned here |
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* |
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* Returns: errno |
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*/ |
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int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num, |
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struct buffer_head **bhp) |
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{ |
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struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
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struct gfs2_glock *gl = ip->i_gl; |
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struct buffer_head *bh; |
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int ret = 0; |
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u32 mtype = height ? GFS2_METATYPE_IN : GFS2_METATYPE_DI; |
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int rahead = 0; |
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if (num == ip->i_no_addr) |
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rahead = ip->i_rahead; |
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ret = gfs2_meta_read(gl, num, DIO_WAIT, rahead, &bh); |
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if (ret == 0 && gfs2_metatype_check(sdp, bh, mtype)) { |
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brelse(bh); |
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ret = -EIO; |
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} else { |
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*bhp = bh; |
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} |
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return ret; |
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} |
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/** |
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* gfs2_meta_ra - start readahead on an extent of a file |
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* @gl: the glock the blocks belong to |
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* @dblock: the starting disk block |
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* @extlen: the number of blocks in the extent |
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* |
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* returns: the first buffer in the extent |
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*/ |
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struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen) |
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{ |
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struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; |
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struct buffer_head *first_bh, *bh; |
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u32 max_ra = gfs2_tune_get(sdp, gt_max_readahead) >> |
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sdp->sd_sb.sb_bsize_shift; |
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BUG_ON(!extlen); |
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if (max_ra < 1) |
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max_ra = 1; |
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if (extlen > max_ra) |
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extlen = max_ra; |
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first_bh = gfs2_getbuf(gl, dblock, CREATE); |
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if (buffer_uptodate(first_bh)) |
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goto out; |
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if (!buffer_locked(first_bh)) |
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ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &first_bh); |
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dblock++; |
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extlen--; |
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while (extlen) { |
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bh = gfs2_getbuf(gl, dblock, CREATE); |
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if (!buffer_uptodate(bh) && !buffer_locked(bh)) |
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ll_rw_block(REQ_OP_READ, |
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REQ_RAHEAD | REQ_META | REQ_PRIO, |
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1, &bh); |
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brelse(bh); |
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dblock++; |
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extlen--; |
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if (!buffer_locked(first_bh) && buffer_uptodate(first_bh)) |
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goto out; |
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} |
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wait_on_buffer(first_bh); |
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out: |
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return first_bh; |
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} |
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