mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 14:13:49 +07:00
3994fc4895
It's possible for pagecache writeback to split up a large amount of work into smaller pieces for throttling purposes or to reduce the amount of time a writeback operation is pending. Whatever the reason, XFS can end up with a bunch of IO completions that call for the same operation to be performed on a contiguous extent mapping. Since mappings are extent based in XFS, we'd prefer to run fewer transactions when we can. When we're processing an ioend on the list of io completions, check to see if the next items on the list are both adjacent and of the same type. If so, we can merge the completions to reduce transaction overhead. On fast storage this doesn't seem to make much of a difference in performance, though the number of transactions for an overnight xfstests run seems to drop by ~5%. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
1198 lines
34 KiB
C
1198 lines
34 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* Copyright (c) 2016-2018 Christoph Hellwig.
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* All Rights Reserved.
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*/
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#include "xfs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_inode.h"
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#include "xfs_trans.h"
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#include "xfs_inode_item.h"
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#include "xfs_alloc.h"
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#include "xfs_error.h"
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#include "xfs_iomap.h"
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#include "xfs_trace.h"
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#include "xfs_bmap.h"
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#include "xfs_bmap_util.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_reflink.h"
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#include <linux/writeback.h>
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/*
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* structure owned by writepages passed to individual writepage calls
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*/
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struct xfs_writepage_ctx {
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struct xfs_bmbt_irec imap;
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int fork;
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unsigned int data_seq;
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unsigned int cow_seq;
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struct xfs_ioend *ioend;
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};
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struct block_device *
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xfs_find_bdev_for_inode(
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struct inode *inode)
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{
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struct xfs_inode *ip = XFS_I(inode);
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struct xfs_mount *mp = ip->i_mount;
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if (XFS_IS_REALTIME_INODE(ip))
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return mp->m_rtdev_targp->bt_bdev;
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else
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return mp->m_ddev_targp->bt_bdev;
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}
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struct dax_device *
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xfs_find_daxdev_for_inode(
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struct inode *inode)
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{
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struct xfs_inode *ip = XFS_I(inode);
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struct xfs_mount *mp = ip->i_mount;
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if (XFS_IS_REALTIME_INODE(ip))
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return mp->m_rtdev_targp->bt_daxdev;
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else
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return mp->m_ddev_targp->bt_daxdev;
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}
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static void
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xfs_finish_page_writeback(
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struct inode *inode,
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struct bio_vec *bvec,
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int error)
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{
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struct iomap_page *iop = to_iomap_page(bvec->bv_page);
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if (error) {
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SetPageError(bvec->bv_page);
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mapping_set_error(inode->i_mapping, -EIO);
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}
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ASSERT(iop || i_blocksize(inode) == PAGE_SIZE);
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ASSERT(!iop || atomic_read(&iop->write_count) > 0);
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if (!iop || atomic_dec_and_test(&iop->write_count))
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end_page_writeback(bvec->bv_page);
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}
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/*
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* We're now finished for good with this ioend structure. Update the page
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* state, release holds on bios, and finally free up memory. Do not use the
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* ioend after this.
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*/
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STATIC void
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xfs_destroy_ioend(
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struct xfs_ioend *ioend,
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int error)
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{
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struct inode *inode = ioend->io_inode;
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struct bio *bio = &ioend->io_inline_bio;
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struct bio *last = ioend->io_bio, *next;
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u64 start = bio->bi_iter.bi_sector;
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bool quiet = bio_flagged(bio, BIO_QUIET);
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for (bio = &ioend->io_inline_bio; bio; bio = next) {
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struct bio_vec *bvec;
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int i;
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struct bvec_iter_all iter_all;
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/*
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* For the last bio, bi_private points to the ioend, so we
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* need to explicitly end the iteration here.
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*/
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if (bio == last)
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next = NULL;
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else
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next = bio->bi_private;
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/* walk each page on bio, ending page IO on them */
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bio_for_each_segment_all(bvec, bio, i, iter_all)
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xfs_finish_page_writeback(inode, bvec, error);
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bio_put(bio);
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}
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if (unlikely(error && !quiet)) {
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xfs_err_ratelimited(XFS_I(inode)->i_mount,
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"writeback error on sector %llu", start);
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}
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}
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/*
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* Fast and loose check if this write could update the on-disk inode size.
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*/
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static inline bool xfs_ioend_is_append(struct xfs_ioend *ioend)
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{
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return ioend->io_offset + ioend->io_size >
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XFS_I(ioend->io_inode)->i_d.di_size;
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}
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STATIC int
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xfs_setfilesize_trans_alloc(
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struct xfs_ioend *ioend)
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{
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struct xfs_mount *mp = XFS_I(ioend->io_inode)->i_mount;
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struct xfs_trans *tp;
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int error;
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error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0,
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XFS_TRANS_NOFS, &tp);
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if (error)
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return error;
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ioend->io_append_trans = tp;
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/*
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* We may pass freeze protection with a transaction. So tell lockdep
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* we released it.
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*/
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__sb_writers_release(ioend->io_inode->i_sb, SB_FREEZE_FS);
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/*
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* We hand off the transaction to the completion thread now, so
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* clear the flag here.
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*/
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current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
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return 0;
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}
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/*
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* Update on-disk file size now that data has been written to disk.
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*/
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STATIC int
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__xfs_setfilesize(
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struct xfs_inode *ip,
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struct xfs_trans *tp,
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xfs_off_t offset,
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size_t size)
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{
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xfs_fsize_t isize;
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xfs_ilock(ip, XFS_ILOCK_EXCL);
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isize = xfs_new_eof(ip, offset + size);
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if (!isize) {
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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xfs_trans_cancel(tp);
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return 0;
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}
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trace_xfs_setfilesize(ip, offset, size);
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ip->i_d.di_size = isize;
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xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
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xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
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return xfs_trans_commit(tp);
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}
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int
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xfs_setfilesize(
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struct xfs_inode *ip,
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xfs_off_t offset,
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size_t size)
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{
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struct xfs_mount *mp = ip->i_mount;
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struct xfs_trans *tp;
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int error;
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error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);
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if (error)
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return error;
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return __xfs_setfilesize(ip, tp, offset, size);
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}
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STATIC int
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xfs_setfilesize_ioend(
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struct xfs_ioend *ioend,
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int error)
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{
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struct xfs_inode *ip = XFS_I(ioend->io_inode);
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struct xfs_trans *tp = ioend->io_append_trans;
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/*
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* The transaction may have been allocated in the I/O submission thread,
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* thus we need to mark ourselves as being in a transaction manually.
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* Similarly for freeze protection.
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*/
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current_set_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
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__sb_writers_acquired(VFS_I(ip)->i_sb, SB_FREEZE_FS);
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/* we abort the update if there was an IO error */
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if (error) {
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xfs_trans_cancel(tp);
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return error;
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}
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return __xfs_setfilesize(ip, tp, ioend->io_offset, ioend->io_size);
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}
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/*
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* IO write completion.
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*/
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STATIC void
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xfs_end_ioend(
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struct xfs_ioend *ioend)
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{
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struct list_head ioend_list;
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struct xfs_inode *ip = XFS_I(ioend->io_inode);
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xfs_off_t offset = ioend->io_offset;
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size_t size = ioend->io_size;
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int error;
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/*
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* Just clean up the in-memory strutures if the fs has been shut down.
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*/
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if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
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error = -EIO;
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goto done;
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}
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/*
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* Clean up any COW blocks on an I/O error.
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*/
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error = blk_status_to_errno(ioend->io_bio->bi_status);
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if (unlikely(error)) {
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if (ioend->io_fork == XFS_COW_FORK)
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xfs_reflink_cancel_cow_range(ip, offset, size, true);
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goto done;
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}
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/*
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* Success: commit the COW or unwritten blocks if needed.
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*/
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if (ioend->io_fork == XFS_COW_FORK)
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error = xfs_reflink_end_cow(ip, offset, size);
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else if (ioend->io_state == XFS_EXT_UNWRITTEN)
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error = xfs_iomap_write_unwritten(ip, offset, size, false);
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else
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ASSERT(!xfs_ioend_is_append(ioend) || ioend->io_append_trans);
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done:
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if (ioend->io_append_trans)
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error = xfs_setfilesize_ioend(ioend, error);
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list_replace_init(&ioend->io_list, &ioend_list);
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xfs_destroy_ioend(ioend, error);
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while (!list_empty(&ioend_list)) {
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ioend = list_first_entry(&ioend_list, struct xfs_ioend,
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io_list);
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list_del_init(&ioend->io_list);
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xfs_destroy_ioend(ioend, error);
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}
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}
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/*
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* We can merge two adjacent ioends if they have the same set of work to do.
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*/
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static bool
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xfs_ioend_can_merge(
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struct xfs_ioend *ioend,
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int ioend_error,
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struct xfs_ioend *next)
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{
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int next_error;
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next_error = blk_status_to_errno(next->io_bio->bi_status);
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if (ioend_error != next_error)
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return false;
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if ((ioend->io_fork == XFS_COW_FORK) ^ (next->io_fork == XFS_COW_FORK))
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return false;
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if ((ioend->io_state == XFS_EXT_UNWRITTEN) ^
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(next->io_state == XFS_EXT_UNWRITTEN))
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return false;
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if (ioend->io_offset + ioend->io_size != next->io_offset)
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return false;
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if (xfs_ioend_is_append(ioend) != xfs_ioend_is_append(next))
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return false;
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return true;
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}
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/* Try to merge adjacent completions. */
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STATIC void
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xfs_ioend_try_merge(
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struct xfs_ioend *ioend,
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struct list_head *more_ioends)
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{
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struct xfs_ioend *next_ioend;
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int ioend_error;
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int error;
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if (list_empty(more_ioends))
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return;
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ioend_error = blk_status_to_errno(ioend->io_bio->bi_status);
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while (!list_empty(more_ioends)) {
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next_ioend = list_first_entry(more_ioends, struct xfs_ioend,
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io_list);
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if (!xfs_ioend_can_merge(ioend, ioend_error, next_ioend))
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break;
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list_move_tail(&next_ioend->io_list, &ioend->io_list);
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ioend->io_size += next_ioend->io_size;
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if (ioend->io_append_trans) {
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error = xfs_setfilesize_ioend(next_ioend, 1);
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ASSERT(error == 1);
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}
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}
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}
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/* list_sort compare function for ioends */
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static int
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xfs_ioend_compare(
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void *priv,
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struct list_head *a,
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struct list_head *b)
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{
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struct xfs_ioend *ia;
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struct xfs_ioend *ib;
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ia = container_of(a, struct xfs_ioend, io_list);
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ib = container_of(b, struct xfs_ioend, io_list);
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if (ia->io_offset < ib->io_offset)
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return -1;
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else if (ia->io_offset > ib->io_offset)
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return 1;
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return 0;
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}
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/* Finish all pending io completions. */
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void
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xfs_end_io(
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struct work_struct *work)
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{
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struct xfs_inode *ip;
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struct xfs_ioend *ioend;
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struct list_head completion_list;
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unsigned long flags;
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ip = container_of(work, struct xfs_inode, i_ioend_work);
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spin_lock_irqsave(&ip->i_ioend_lock, flags);
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list_replace_init(&ip->i_ioend_list, &completion_list);
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spin_unlock_irqrestore(&ip->i_ioend_lock, flags);
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list_sort(NULL, &completion_list, xfs_ioend_compare);
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while (!list_empty(&completion_list)) {
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ioend = list_first_entry(&completion_list, struct xfs_ioend,
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io_list);
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list_del_init(&ioend->io_list);
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xfs_ioend_try_merge(ioend, &completion_list);
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xfs_end_ioend(ioend);
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}
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}
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STATIC void
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xfs_end_bio(
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struct bio *bio)
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{
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struct xfs_ioend *ioend = bio->bi_private;
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struct xfs_inode *ip = XFS_I(ioend->io_inode);
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struct xfs_mount *mp = ip->i_mount;
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unsigned long flags;
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if (ioend->io_fork == XFS_COW_FORK ||
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ioend->io_state == XFS_EXT_UNWRITTEN ||
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ioend->io_append_trans != NULL) {
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spin_lock_irqsave(&ip->i_ioend_lock, flags);
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if (list_empty(&ip->i_ioend_list))
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WARN_ON_ONCE(!queue_work(mp->m_unwritten_workqueue,
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&ip->i_ioend_work));
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list_add_tail(&ioend->io_list, &ip->i_ioend_list);
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spin_unlock_irqrestore(&ip->i_ioend_lock, flags);
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} else
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xfs_destroy_ioend(ioend, blk_status_to_errno(bio->bi_status));
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}
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/*
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* Fast revalidation of the cached writeback mapping. Return true if the current
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* mapping is valid, false otherwise.
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*/
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static bool
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xfs_imap_valid(
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struct xfs_writepage_ctx *wpc,
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struct xfs_inode *ip,
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xfs_fileoff_t offset_fsb)
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{
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if (offset_fsb < wpc->imap.br_startoff ||
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offset_fsb >= wpc->imap.br_startoff + wpc->imap.br_blockcount)
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return false;
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/*
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* If this is a COW mapping, it is sufficient to check that the mapping
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* covers the offset. Be careful to check this first because the caller
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* can revalidate a COW mapping without updating the data seqno.
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*/
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if (wpc->fork == XFS_COW_FORK)
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return true;
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|
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/*
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* This is not a COW mapping. Check the sequence number of the data fork
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* because concurrent changes could have invalidated the extent. Check
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* the COW fork because concurrent changes since the last time we
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* checked (and found nothing at this offset) could have added
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* overlapping blocks.
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*/
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if (wpc->data_seq != READ_ONCE(ip->i_df.if_seq))
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return false;
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if (xfs_inode_has_cow_data(ip) &&
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wpc->cow_seq != READ_ONCE(ip->i_cowfp->if_seq))
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return false;
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return true;
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}
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|
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/*
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* Pass in a dellalloc extent and convert it to real extents, return the real
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* extent that maps offset_fsb in wpc->imap.
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*
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* The current page is held locked so nothing could have removed the block
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* backing offset_fsb, although it could have moved from the COW to the data
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* fork by another thread.
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*/
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static int
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xfs_convert_blocks(
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struct xfs_writepage_ctx *wpc,
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struct xfs_inode *ip,
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xfs_fileoff_t offset_fsb)
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{
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int error;
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/*
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* Attempt to allocate whatever delalloc extent currently backs
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* offset_fsb and put the result into wpc->imap. Allocate in a loop
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* because it may take several attempts to allocate real blocks for a
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* contiguous delalloc extent if free space is sufficiently fragmented.
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*/
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do {
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error = xfs_bmapi_convert_delalloc(ip, wpc->fork, offset_fsb,
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&wpc->imap, wpc->fork == XFS_COW_FORK ?
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&wpc->cow_seq : &wpc->data_seq);
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if (error)
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return error;
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} while (wpc->imap.br_startoff + wpc->imap.br_blockcount <= offset_fsb);
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|
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return 0;
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}
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|
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STATIC int
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xfs_map_blocks(
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struct xfs_writepage_ctx *wpc,
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struct inode *inode,
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loff_t offset)
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|
{
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struct xfs_inode *ip = XFS_I(inode);
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struct xfs_mount *mp = ip->i_mount;
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ssize_t count = i_blocksize(inode);
|
|
xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
|
|
xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, offset + count);
|
|
xfs_fileoff_t cow_fsb = NULLFILEOFF;
|
|
struct xfs_bmbt_irec imap;
|
|
struct xfs_iext_cursor icur;
|
|
int retries = 0;
|
|
int error = 0;
|
|
|
|
if (XFS_FORCED_SHUTDOWN(mp))
|
|
return -EIO;
|
|
|
|
/*
|
|
* COW fork blocks can overlap data fork blocks even if the blocks
|
|
* aren't shared. COW I/O always takes precedent, so we must always
|
|
* check for overlap on reflink inodes unless the mapping is already a
|
|
* COW one, or the COW fork hasn't changed from the last time we looked
|
|
* at it.
|
|
*
|
|
* It's safe to check the COW fork if_seq here without the ILOCK because
|
|
* we've indirectly protected against concurrent updates: writeback has
|
|
* the page locked, which prevents concurrent invalidations by reflink
|
|
* and directio and prevents concurrent buffered writes to the same
|
|
* page. Changes to if_seq always happen under i_lock, which protects
|
|
* against concurrent updates and provides a memory barrier on the way
|
|
* out that ensures that we always see the current value.
|
|
*/
|
|
if (xfs_imap_valid(wpc, ip, offset_fsb))
|
|
return 0;
|
|
|
|
/*
|
|
* If we don't have a valid map, now it's time to get a new one for this
|
|
* offset. This will convert delayed allocations (including COW ones)
|
|
* into real extents. If we return without a valid map, it means we
|
|
* landed in a hole and we skip the block.
|
|
*/
|
|
retry:
|
|
xfs_ilock(ip, XFS_ILOCK_SHARED);
|
|
ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
|
|
(ip->i_df.if_flags & XFS_IFEXTENTS));
|
|
|
|
/*
|
|
* Check if this is offset is covered by a COW extents, and if yes use
|
|
* it directly instead of looking up anything in the data fork.
|
|
*/
|
|
if (xfs_inode_has_cow_data(ip) &&
|
|
xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb, &icur, &imap))
|
|
cow_fsb = imap.br_startoff;
|
|
if (cow_fsb != NULLFILEOFF && cow_fsb <= offset_fsb) {
|
|
wpc->cow_seq = READ_ONCE(ip->i_cowfp->if_seq);
|
|
xfs_iunlock(ip, XFS_ILOCK_SHARED);
|
|
|
|
wpc->fork = XFS_COW_FORK;
|
|
goto allocate_blocks;
|
|
}
|
|
|
|
/*
|
|
* No COW extent overlap. Revalidate now that we may have updated
|
|
* ->cow_seq. If the data mapping is still valid, we're done.
|
|
*/
|
|
if (xfs_imap_valid(wpc, ip, offset_fsb)) {
|
|
xfs_iunlock(ip, XFS_ILOCK_SHARED);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If we don't have a valid map, now it's time to get a new one for this
|
|
* offset. This will convert delayed allocations (including COW ones)
|
|
* into real extents.
|
|
*/
|
|
if (!xfs_iext_lookup_extent(ip, &ip->i_df, offset_fsb, &icur, &imap))
|
|
imap.br_startoff = end_fsb; /* fake a hole past EOF */
|
|
wpc->data_seq = READ_ONCE(ip->i_df.if_seq);
|
|
xfs_iunlock(ip, XFS_ILOCK_SHARED);
|
|
|
|
wpc->fork = XFS_DATA_FORK;
|
|
|
|
/* landed in a hole or beyond EOF? */
|
|
if (imap.br_startoff > offset_fsb) {
|
|
imap.br_blockcount = imap.br_startoff - offset_fsb;
|
|
imap.br_startoff = offset_fsb;
|
|
imap.br_startblock = HOLESTARTBLOCK;
|
|
imap.br_state = XFS_EXT_NORM;
|
|
}
|
|
|
|
/*
|
|
* Truncate to the next COW extent if there is one. This is the only
|
|
* opportunity to do this because we can skip COW fork lookups for the
|
|
* subsequent blocks in the mapping; however, the requirement to treat
|
|
* the COW range separately remains.
|
|
*/
|
|
if (cow_fsb != NULLFILEOFF &&
|
|
cow_fsb < imap.br_startoff + imap.br_blockcount)
|
|
imap.br_blockcount = cow_fsb - imap.br_startoff;
|
|
|
|
/* got a delalloc extent? */
|
|
if (imap.br_startblock != HOLESTARTBLOCK &&
|
|
isnullstartblock(imap.br_startblock))
|
|
goto allocate_blocks;
|
|
|
|
wpc->imap = imap;
|
|
trace_xfs_map_blocks_found(ip, offset, count, wpc->fork, &imap);
|
|
return 0;
|
|
allocate_blocks:
|
|
error = xfs_convert_blocks(wpc, ip, offset_fsb);
|
|
if (error) {
|
|
/*
|
|
* If we failed to find the extent in the COW fork we might have
|
|
* raced with a COW to data fork conversion or truncate.
|
|
* Restart the lookup to catch the extent in the data fork for
|
|
* the former case, but prevent additional retries to avoid
|
|
* looping forever for the latter case.
|
|
*/
|
|
if (error == -EAGAIN && wpc->fork == XFS_COW_FORK && !retries++)
|
|
goto retry;
|
|
ASSERT(error != -EAGAIN);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Due to merging the return real extent might be larger than the
|
|
* original delalloc one. Trim the return extent to the next COW
|
|
* boundary again to force a re-lookup.
|
|
*/
|
|
if (wpc->fork != XFS_COW_FORK && cow_fsb != NULLFILEOFF &&
|
|
cow_fsb < wpc->imap.br_startoff + wpc->imap.br_blockcount)
|
|
wpc->imap.br_blockcount = cow_fsb - wpc->imap.br_startoff;
|
|
|
|
ASSERT(wpc->imap.br_startoff <= offset_fsb);
|
|
ASSERT(wpc->imap.br_startoff + wpc->imap.br_blockcount > offset_fsb);
|
|
trace_xfs_map_blocks_alloc(ip, offset, count, wpc->fork, &imap);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Submit the bio for an ioend. We are passed an ioend with a bio attached to
|
|
* it, and we submit that bio. The ioend may be used for multiple bio
|
|
* submissions, so we only want to allocate an append transaction for the ioend
|
|
* once. In the case of multiple bio submission, each bio will take an IO
|
|
* reference to the ioend to ensure that the ioend completion is only done once
|
|
* all bios have been submitted and the ioend is really done.
|
|
*
|
|
* If @fail is non-zero, it means that we have a situation where some part of
|
|
* the submission process has failed after we have marked paged for writeback
|
|
* and unlocked them. In this situation, we need to fail the bio and ioend
|
|
* rather than submit it to IO. This typically only happens on a filesystem
|
|
* shutdown.
|
|
*/
|
|
STATIC int
|
|
xfs_submit_ioend(
|
|
struct writeback_control *wbc,
|
|
struct xfs_ioend *ioend,
|
|
int status)
|
|
{
|
|
/* Convert CoW extents to regular */
|
|
if (!status && ioend->io_fork == XFS_COW_FORK) {
|
|
/*
|
|
* Yuk. This can do memory allocation, but is not a
|
|
* transactional operation so everything is done in GFP_KERNEL
|
|
* context. That can deadlock, because we hold pages in
|
|
* writeback state and GFP_KERNEL allocations can block on them.
|
|
* Hence we must operate in nofs conditions here.
|
|
*/
|
|
unsigned nofs_flag;
|
|
|
|
nofs_flag = memalloc_nofs_save();
|
|
status = xfs_reflink_convert_cow(XFS_I(ioend->io_inode),
|
|
ioend->io_offset, ioend->io_size);
|
|
memalloc_nofs_restore(nofs_flag);
|
|
}
|
|
|
|
/* Reserve log space if we might write beyond the on-disk inode size. */
|
|
if (!status &&
|
|
(ioend->io_fork == XFS_COW_FORK ||
|
|
ioend->io_state != XFS_EXT_UNWRITTEN) &&
|
|
xfs_ioend_is_append(ioend) &&
|
|
!ioend->io_append_trans)
|
|
status = xfs_setfilesize_trans_alloc(ioend);
|
|
|
|
ioend->io_bio->bi_private = ioend;
|
|
ioend->io_bio->bi_end_io = xfs_end_bio;
|
|
ioend->io_bio->bi_opf = REQ_OP_WRITE | wbc_to_write_flags(wbc);
|
|
|
|
/*
|
|
* If we are failing the IO now, just mark the ioend with an
|
|
* error and finish it. This will run IO completion immediately
|
|
* as there is only one reference to the ioend at this point in
|
|
* time.
|
|
*/
|
|
if (status) {
|
|
ioend->io_bio->bi_status = errno_to_blk_status(status);
|
|
bio_endio(ioend->io_bio);
|
|
return status;
|
|
}
|
|
|
|
ioend->io_bio->bi_write_hint = ioend->io_inode->i_write_hint;
|
|
submit_bio(ioend->io_bio);
|
|
return 0;
|
|
}
|
|
|
|
static struct xfs_ioend *
|
|
xfs_alloc_ioend(
|
|
struct inode *inode,
|
|
int fork,
|
|
xfs_exntst_t state,
|
|
xfs_off_t offset,
|
|
struct block_device *bdev,
|
|
sector_t sector)
|
|
{
|
|
struct xfs_ioend *ioend;
|
|
struct bio *bio;
|
|
|
|
bio = bio_alloc_bioset(GFP_NOFS, BIO_MAX_PAGES, &xfs_ioend_bioset);
|
|
bio_set_dev(bio, bdev);
|
|
bio->bi_iter.bi_sector = sector;
|
|
|
|
ioend = container_of(bio, struct xfs_ioend, io_inline_bio);
|
|
INIT_LIST_HEAD(&ioend->io_list);
|
|
ioend->io_fork = fork;
|
|
ioend->io_state = state;
|
|
ioend->io_inode = inode;
|
|
ioend->io_size = 0;
|
|
ioend->io_offset = offset;
|
|
ioend->io_append_trans = NULL;
|
|
ioend->io_bio = bio;
|
|
return ioend;
|
|
}
|
|
|
|
/*
|
|
* Allocate a new bio, and chain the old bio to the new one.
|
|
*
|
|
* Note that we have to do perform the chaining in this unintuitive order
|
|
* so that the bi_private linkage is set up in the right direction for the
|
|
* traversal in xfs_destroy_ioend().
|
|
*/
|
|
static void
|
|
xfs_chain_bio(
|
|
struct xfs_ioend *ioend,
|
|
struct writeback_control *wbc,
|
|
struct block_device *bdev,
|
|
sector_t sector)
|
|
{
|
|
struct bio *new;
|
|
|
|
new = bio_alloc(GFP_NOFS, BIO_MAX_PAGES);
|
|
bio_set_dev(new, bdev);
|
|
new->bi_iter.bi_sector = sector;
|
|
bio_chain(ioend->io_bio, new);
|
|
bio_get(ioend->io_bio); /* for xfs_destroy_ioend */
|
|
ioend->io_bio->bi_opf = REQ_OP_WRITE | wbc_to_write_flags(wbc);
|
|
ioend->io_bio->bi_write_hint = ioend->io_inode->i_write_hint;
|
|
submit_bio(ioend->io_bio);
|
|
ioend->io_bio = new;
|
|
}
|
|
|
|
/*
|
|
* Test to see if we have an existing ioend structure that we could append to
|
|
* first, otherwise finish off the current ioend and start another.
|
|
*/
|
|
STATIC void
|
|
xfs_add_to_ioend(
|
|
struct inode *inode,
|
|
xfs_off_t offset,
|
|
struct page *page,
|
|
struct iomap_page *iop,
|
|
struct xfs_writepage_ctx *wpc,
|
|
struct writeback_control *wbc,
|
|
struct list_head *iolist)
|
|
{
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct block_device *bdev = xfs_find_bdev_for_inode(inode);
|
|
unsigned len = i_blocksize(inode);
|
|
unsigned poff = offset & (PAGE_SIZE - 1);
|
|
sector_t sector;
|
|
|
|
sector = xfs_fsb_to_db(ip, wpc->imap.br_startblock) +
|
|
((offset - XFS_FSB_TO_B(mp, wpc->imap.br_startoff)) >> 9);
|
|
|
|
if (!wpc->ioend ||
|
|
wpc->fork != wpc->ioend->io_fork ||
|
|
wpc->imap.br_state != wpc->ioend->io_state ||
|
|
sector != bio_end_sector(wpc->ioend->io_bio) ||
|
|
offset != wpc->ioend->io_offset + wpc->ioend->io_size) {
|
|
if (wpc->ioend)
|
|
list_add(&wpc->ioend->io_list, iolist);
|
|
wpc->ioend = xfs_alloc_ioend(inode, wpc->fork,
|
|
wpc->imap.br_state, offset, bdev, sector);
|
|
}
|
|
|
|
if (!__bio_try_merge_page(wpc->ioend->io_bio, page, len, poff, true)) {
|
|
if (iop)
|
|
atomic_inc(&iop->write_count);
|
|
if (bio_full(wpc->ioend->io_bio))
|
|
xfs_chain_bio(wpc->ioend, wbc, bdev, sector);
|
|
bio_add_page(wpc->ioend->io_bio, page, len, poff);
|
|
}
|
|
|
|
wpc->ioend->io_size += len;
|
|
}
|
|
|
|
STATIC void
|
|
xfs_vm_invalidatepage(
|
|
struct page *page,
|
|
unsigned int offset,
|
|
unsigned int length)
|
|
{
|
|
trace_xfs_invalidatepage(page->mapping->host, page, offset, length);
|
|
iomap_invalidatepage(page, offset, length);
|
|
}
|
|
|
|
/*
|
|
* If the page has delalloc blocks on it, we need to punch them out before we
|
|
* invalidate the page. If we don't, we leave a stale delalloc mapping on the
|
|
* inode that can trip up a later direct I/O read operation on the same region.
|
|
*
|
|
* We prevent this by truncating away the delalloc regions on the page. Because
|
|
* they are delalloc, we can do this without needing a transaction. Indeed - if
|
|
* we get ENOSPC errors, we have to be able to do this truncation without a
|
|
* transaction as there is no space left for block reservation (typically why we
|
|
* see a ENOSPC in writeback).
|
|
*/
|
|
STATIC void
|
|
xfs_aops_discard_page(
|
|
struct page *page)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
loff_t offset = page_offset(page);
|
|
xfs_fileoff_t start_fsb = XFS_B_TO_FSBT(mp, offset);
|
|
int error;
|
|
|
|
if (XFS_FORCED_SHUTDOWN(mp))
|
|
goto out_invalidate;
|
|
|
|
xfs_alert(mp,
|
|
"page discard on page "PTR_FMT", inode 0x%llx, offset %llu.",
|
|
page, ip->i_ino, offset);
|
|
|
|
error = xfs_bmap_punch_delalloc_range(ip, start_fsb,
|
|
PAGE_SIZE / i_blocksize(inode));
|
|
if (error && !XFS_FORCED_SHUTDOWN(mp))
|
|
xfs_alert(mp, "page discard unable to remove delalloc mapping.");
|
|
out_invalidate:
|
|
xfs_vm_invalidatepage(page, 0, PAGE_SIZE);
|
|
}
|
|
|
|
/*
|
|
* We implement an immediate ioend submission policy here to avoid needing to
|
|
* chain multiple ioends and hence nest mempool allocations which can violate
|
|
* forward progress guarantees we need to provide. The current ioend we are
|
|
* adding blocks to is cached on the writepage context, and if the new block
|
|
* does not append to the cached ioend it will create a new ioend and cache that
|
|
* instead.
|
|
*
|
|
* If a new ioend is created and cached, the old ioend is returned and queued
|
|
* locally for submission once the entire page is processed or an error has been
|
|
* detected. While ioends are submitted immediately after they are completed,
|
|
* batching optimisations are provided by higher level block plugging.
|
|
*
|
|
* At the end of a writeback pass, there will be a cached ioend remaining on the
|
|
* writepage context that the caller will need to submit.
|
|
*/
|
|
static int
|
|
xfs_writepage_map(
|
|
struct xfs_writepage_ctx *wpc,
|
|
struct writeback_control *wbc,
|
|
struct inode *inode,
|
|
struct page *page,
|
|
uint64_t end_offset)
|
|
{
|
|
LIST_HEAD(submit_list);
|
|
struct iomap_page *iop = to_iomap_page(page);
|
|
unsigned len = i_blocksize(inode);
|
|
struct xfs_ioend *ioend, *next;
|
|
uint64_t file_offset; /* file offset of page */
|
|
int error = 0, count = 0, i;
|
|
|
|
ASSERT(iop || i_blocksize(inode) == PAGE_SIZE);
|
|
ASSERT(!iop || atomic_read(&iop->write_count) == 0);
|
|
|
|
/*
|
|
* Walk through the page to find areas to write back. If we run off the
|
|
* end of the current map or find the current map invalid, grab a new
|
|
* one.
|
|
*/
|
|
for (i = 0, file_offset = page_offset(page);
|
|
i < (PAGE_SIZE >> inode->i_blkbits) && file_offset < end_offset;
|
|
i++, file_offset += len) {
|
|
if (iop && !test_bit(i, iop->uptodate))
|
|
continue;
|
|
|
|
error = xfs_map_blocks(wpc, inode, file_offset);
|
|
if (error)
|
|
break;
|
|
if (wpc->imap.br_startblock == HOLESTARTBLOCK)
|
|
continue;
|
|
xfs_add_to_ioend(inode, file_offset, page, iop, wpc, wbc,
|
|
&submit_list);
|
|
count++;
|
|
}
|
|
|
|
ASSERT(wpc->ioend || list_empty(&submit_list));
|
|
ASSERT(PageLocked(page));
|
|
ASSERT(!PageWriteback(page));
|
|
|
|
/*
|
|
* On error, we have to fail the ioend here because we may have set
|
|
* pages under writeback, we have to make sure we run IO completion to
|
|
* mark the error state of the IO appropriately, so we can't cancel the
|
|
* ioend directly here. That means we have to mark this page as under
|
|
* writeback if we included any blocks from it in the ioend chain so
|
|
* that completion treats it correctly.
|
|
*
|
|
* If we didn't include the page in the ioend, the on error we can
|
|
* simply discard and unlock it as there are no other users of the page
|
|
* now. The caller will still need to trigger submission of outstanding
|
|
* ioends on the writepage context so they are treated correctly on
|
|
* error.
|
|
*/
|
|
if (unlikely(error)) {
|
|
if (!count) {
|
|
xfs_aops_discard_page(page);
|
|
ClearPageUptodate(page);
|
|
unlock_page(page);
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* If the page was not fully cleaned, we need to ensure that the
|
|
* higher layers come back to it correctly. That means we need
|
|
* to keep the page dirty, and for WB_SYNC_ALL writeback we need
|
|
* to ensure the PAGECACHE_TAG_TOWRITE index mark is not removed
|
|
* so another attempt to write this page in this writeback sweep
|
|
* will be made.
|
|
*/
|
|
set_page_writeback_keepwrite(page);
|
|
} else {
|
|
clear_page_dirty_for_io(page);
|
|
set_page_writeback(page);
|
|
}
|
|
|
|
unlock_page(page);
|
|
|
|
/*
|
|
* Preserve the original error if there was one, otherwise catch
|
|
* submission errors here and propagate into subsequent ioend
|
|
* submissions.
|
|
*/
|
|
list_for_each_entry_safe(ioend, next, &submit_list, io_list) {
|
|
int error2;
|
|
|
|
list_del_init(&ioend->io_list);
|
|
error2 = xfs_submit_ioend(wbc, ioend, error);
|
|
if (error2 && !error)
|
|
error = error2;
|
|
}
|
|
|
|
/*
|
|
* We can end up here with no error and nothing to write only if we race
|
|
* with a partial page truncate on a sub-page block sized filesystem.
|
|
*/
|
|
if (!count)
|
|
end_page_writeback(page);
|
|
done:
|
|
mapping_set_error(page->mapping, error);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Write out a dirty page.
|
|
*
|
|
* For delalloc space on the page we need to allocate space and flush it.
|
|
* For unwritten space on the page we need to start the conversion to
|
|
* regular allocated space.
|
|
*/
|
|
STATIC int
|
|
xfs_do_writepage(
|
|
struct page *page,
|
|
struct writeback_control *wbc,
|
|
void *data)
|
|
{
|
|
struct xfs_writepage_ctx *wpc = data;
|
|
struct inode *inode = page->mapping->host;
|
|
loff_t offset;
|
|
uint64_t end_offset;
|
|
pgoff_t end_index;
|
|
|
|
trace_xfs_writepage(inode, page, 0, 0);
|
|
|
|
/*
|
|
* Refuse to write the page out if we are called from reclaim context.
|
|
*
|
|
* This avoids stack overflows when called from deeply used stacks in
|
|
* random callers for direct reclaim or memcg reclaim. We explicitly
|
|
* allow reclaim from kswapd as the stack usage there is relatively low.
|
|
*
|
|
* This should never happen except in the case of a VM regression so
|
|
* warn about it.
|
|
*/
|
|
if (WARN_ON_ONCE((current->flags & (PF_MEMALLOC|PF_KSWAPD)) ==
|
|
PF_MEMALLOC))
|
|
goto redirty;
|
|
|
|
/*
|
|
* Given that we do not allow direct reclaim to call us, we should
|
|
* never be called while in a filesystem transaction.
|
|
*/
|
|
if (WARN_ON_ONCE(current->flags & PF_MEMALLOC_NOFS))
|
|
goto redirty;
|
|
|
|
/*
|
|
* Is this page beyond the end of the file?
|
|
*
|
|
* The page index is less than the end_index, adjust the end_offset
|
|
* to the highest offset that this page should represent.
|
|
* -----------------------------------------------------
|
|
* | file mapping | <EOF> |
|
|
* -----------------------------------------------------
|
|
* | Page ... | Page N-2 | Page N-1 | Page N | |
|
|
* ^--------------------------------^----------|--------
|
|
* | desired writeback range | see else |
|
|
* ---------------------------------^------------------|
|
|
*/
|
|
offset = i_size_read(inode);
|
|
end_index = offset >> PAGE_SHIFT;
|
|
if (page->index < end_index)
|
|
end_offset = (xfs_off_t)(page->index + 1) << PAGE_SHIFT;
|
|
else {
|
|
/*
|
|
* Check whether the page to write out is beyond or straddles
|
|
* i_size or not.
|
|
* -------------------------------------------------------
|
|
* | file mapping | <EOF> |
|
|
* -------------------------------------------------------
|
|
* | Page ... | Page N-2 | Page N-1 | Page N | Beyond |
|
|
* ^--------------------------------^-----------|---------
|
|
* | | Straddles |
|
|
* ---------------------------------^-----------|--------|
|
|
*/
|
|
unsigned offset_into_page = offset & (PAGE_SIZE - 1);
|
|
|
|
/*
|
|
* Skip the page if it is fully outside i_size, e.g. due to a
|
|
* truncate operation that is in progress. We must redirty the
|
|
* page so that reclaim stops reclaiming it. Otherwise
|
|
* xfs_vm_releasepage() is called on it and gets confused.
|
|
*
|
|
* Note that the end_index is unsigned long, it would overflow
|
|
* if the given offset is greater than 16TB on 32-bit system
|
|
* and if we do check the page is fully outside i_size or not
|
|
* via "if (page->index >= end_index + 1)" as "end_index + 1"
|
|
* will be evaluated to 0. Hence this page will be redirtied
|
|
* and be written out repeatedly which would result in an
|
|
* infinite loop, the user program that perform this operation
|
|
* will hang. Instead, we can verify this situation by checking
|
|
* if the page to write is totally beyond the i_size or if it's
|
|
* offset is just equal to the EOF.
|
|
*/
|
|
if (page->index > end_index ||
|
|
(page->index == end_index && offset_into_page == 0))
|
|
goto redirty;
|
|
|
|
/*
|
|
* The page straddles i_size. It must be zeroed out on each
|
|
* and every writepage invocation because it may be mmapped.
|
|
* "A file is mapped in multiples of the page size. For a file
|
|
* that is not a multiple of the page size, the remaining
|
|
* memory is zeroed when mapped, and writes to that region are
|
|
* not written out to the file."
|
|
*/
|
|
zero_user_segment(page, offset_into_page, PAGE_SIZE);
|
|
|
|
/* Adjust the end_offset to the end of file */
|
|
end_offset = offset;
|
|
}
|
|
|
|
return xfs_writepage_map(wpc, wbc, inode, page, end_offset);
|
|
|
|
redirty:
|
|
redirty_page_for_writepage(wbc, page);
|
|
unlock_page(page);
|
|
return 0;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_vm_writepage(
|
|
struct page *page,
|
|
struct writeback_control *wbc)
|
|
{
|
|
struct xfs_writepage_ctx wpc = { };
|
|
int ret;
|
|
|
|
ret = xfs_do_writepage(page, wbc, &wpc);
|
|
if (wpc.ioend)
|
|
ret = xfs_submit_ioend(wbc, wpc.ioend, ret);
|
|
return ret;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_vm_writepages(
|
|
struct address_space *mapping,
|
|
struct writeback_control *wbc)
|
|
{
|
|
struct xfs_writepage_ctx wpc = { };
|
|
int ret;
|
|
|
|
xfs_iflags_clear(XFS_I(mapping->host), XFS_ITRUNCATED);
|
|
ret = write_cache_pages(mapping, wbc, xfs_do_writepage, &wpc);
|
|
if (wpc.ioend)
|
|
ret = xfs_submit_ioend(wbc, wpc.ioend, ret);
|
|
return ret;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_dax_writepages(
|
|
struct address_space *mapping,
|
|
struct writeback_control *wbc)
|
|
{
|
|
xfs_iflags_clear(XFS_I(mapping->host), XFS_ITRUNCATED);
|
|
return dax_writeback_mapping_range(mapping,
|
|
xfs_find_bdev_for_inode(mapping->host), wbc);
|
|
}
|
|
|
|
STATIC int
|
|
xfs_vm_releasepage(
|
|
struct page *page,
|
|
gfp_t gfp_mask)
|
|
{
|
|
trace_xfs_releasepage(page->mapping->host, page, 0, 0);
|
|
return iomap_releasepage(page, gfp_mask);
|
|
}
|
|
|
|
STATIC sector_t
|
|
xfs_vm_bmap(
|
|
struct address_space *mapping,
|
|
sector_t block)
|
|
{
|
|
struct xfs_inode *ip = XFS_I(mapping->host);
|
|
|
|
trace_xfs_vm_bmap(ip);
|
|
|
|
/*
|
|
* The swap code (ab-)uses ->bmap to get a block mapping and then
|
|
* bypasses the file system for actual I/O. We really can't allow
|
|
* that on reflinks inodes, so we have to skip out here. And yes,
|
|
* 0 is the magic code for a bmap error.
|
|
*
|
|
* Since we don't pass back blockdev info, we can't return bmap
|
|
* information for rt files either.
|
|
*/
|
|
if (xfs_is_cow_inode(ip) || XFS_IS_REALTIME_INODE(ip))
|
|
return 0;
|
|
return iomap_bmap(mapping, block, &xfs_iomap_ops);
|
|
}
|
|
|
|
STATIC int
|
|
xfs_vm_readpage(
|
|
struct file *unused,
|
|
struct page *page)
|
|
{
|
|
trace_xfs_vm_readpage(page->mapping->host, 1);
|
|
return iomap_readpage(page, &xfs_iomap_ops);
|
|
}
|
|
|
|
STATIC int
|
|
xfs_vm_readpages(
|
|
struct file *unused,
|
|
struct address_space *mapping,
|
|
struct list_head *pages,
|
|
unsigned nr_pages)
|
|
{
|
|
trace_xfs_vm_readpages(mapping->host, nr_pages);
|
|
return iomap_readpages(mapping, pages, nr_pages, &xfs_iomap_ops);
|
|
}
|
|
|
|
static int
|
|
xfs_iomap_swapfile_activate(
|
|
struct swap_info_struct *sis,
|
|
struct file *swap_file,
|
|
sector_t *span)
|
|
{
|
|
sis->bdev = xfs_find_bdev_for_inode(file_inode(swap_file));
|
|
return iomap_swapfile_activate(sis, swap_file, span, &xfs_iomap_ops);
|
|
}
|
|
|
|
const struct address_space_operations xfs_address_space_operations = {
|
|
.readpage = xfs_vm_readpage,
|
|
.readpages = xfs_vm_readpages,
|
|
.writepage = xfs_vm_writepage,
|
|
.writepages = xfs_vm_writepages,
|
|
.set_page_dirty = iomap_set_page_dirty,
|
|
.releasepage = xfs_vm_releasepage,
|
|
.invalidatepage = xfs_vm_invalidatepage,
|
|
.bmap = xfs_vm_bmap,
|
|
.direct_IO = noop_direct_IO,
|
|
.migratepage = iomap_migrate_page,
|
|
.is_partially_uptodate = iomap_is_partially_uptodate,
|
|
.error_remove_page = generic_error_remove_page,
|
|
.swap_activate = xfs_iomap_swapfile_activate,
|
|
};
|
|
|
|
const struct address_space_operations xfs_dax_aops = {
|
|
.writepages = xfs_dax_writepages,
|
|
.direct_IO = noop_direct_IO,
|
|
.set_page_dirty = noop_set_page_dirty,
|
|
.invalidatepage = noop_invalidatepage,
|
|
.swap_activate = xfs_iomap_swapfile_activate,
|
|
};
|