forked from luck/tmp_suning_uos_patched
74d46992e0
This way we don't need a block_device structure to submit I/O. The block_device has different life time rules from the gendisk and request_queue and is usually only available when the block device node is open. Other callers need to explicitly create one (e.g. the lightnvm passthrough code, or the new nvme multipathing code). For the actual I/O path all that we need is the gendisk, which exists once per block device. But given that the block layer also does partition remapping we additionally need a partition index, which is used for said remapping in generic_make_request. Note that all the block drivers generally want request_queue or sometimes the gendisk, so this removes a layer of indirection all over the stack. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
477 lines
11 KiB
C
477 lines
11 KiB
C
/*
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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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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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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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int i;
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bio_for_each_segment_all(bvec, bio, i) {
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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(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) {
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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(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(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
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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(sdp, bh);
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return -EIO;
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}
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if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
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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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spin_lock(&sdp->sd_ail_lock);
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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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}
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spin_unlock(&sdp->sd_ail_lock);
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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_meta_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_meta_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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while (blen) {
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bh = gfs2_getbuf(ip->i_gl, bstart, NO_CREATE);
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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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gfs2_remove_from_journal(bh, REMOVE_META);
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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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}
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*bhp = bh;
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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, 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, REQ_RAHEAD | REQ_META, 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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