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![Linus Torvalds](/assets/img/avatar_default.png)
Changes in this update: o fixes for mount line parsing, sparse warnings, read-only compat feature remount behaviour o allow fast path symlink lookups for inline symlinks. o attribute listing cleanups o writeback goes direct to bios rather than indirecting through bufferheads o transaction allocation cleanup o optimised kmem_realloc o added configurable error handling for metadata write errors, changed default error handling behaviour from "retry forever" to "retry until unmount then fail" o fixed several inode cluster writeback lookup vs reclaim race conditions o fixed inode cluster writeback checking wrong inode after lookup o fixed bugs where struct xfs_inode freeing wasn't actually RCU safe o cleaned up inode reclaim tagging -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJXRo8LAAoJEK3oKUf0dfodxLgP+wQMd46i/nCncr6jMcdoVXfL rE6cL1LJWWVOWzax/bmdlV1VNXqqW7n0ABAVMqikzqSEd+fBQe/HOkdBeVUywu7o bmqgNxuofMqHaiYhiTvUijHLHWLFxIgd/jNT7L5oGRzZdmP260VGf3EPipN7aA9U Y3KVhFQCqohpeIUeSV4Z/eIDdHN5LyUI1s+7zMLquHKCWyO4aO4GBX8YlyXdRRVe cwCZb4TBryS0PBCIra31MZ5wBRwLx8PBXqcNsnTQSR5Uu+WeuwxofXz5q3kdmNOU XGTWiabQbcvaC4twrzqnErHEX41PAs43tWxsI/qJH49QIFdfOYM+t8ERhEa2Q3DW Ihl+Q/2qiOuZZterG/t5MrxhybrmQhEFVJT6Ib8b/CnwpRm+K8kWTead1YJL8Xzd F9k8e57BCgTbDA7jWxWDbp7eQ1/4KglBD4sefFPpsuFgO882mmo5GmymALGjmitw JH1v3HL3PeTkQoHfcay8ZM/zNjX643CXHwCWYEOAgD+e77TPiOs/cHLZaXbrBkLK PpSJNfYiBe31eeSOEGsxivMapLpus+cHZyK3uR+XU+naJhjOdaBDTTo8RsAD9jS5 C/dzxc4l7o+gYT+UjV5KtyfEeVwtGo5mtR9XozPbNDjNQor8Vo6NQMZXMXpFYDZI 2XgzVNpkEf/74kexdEzV =0tYo -----END PGP SIGNATURE----- Merge tag 'xfs-for-linus-4.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs Pull xfs updates from Dave Chinner: "A pretty average collection of fixes, cleanups and improvements in this request. Summary: - fixes for mount line parsing, sparse warnings, read-only compat feature remount behaviour - allow fast path symlink lookups for inline symlinks. - attribute listing cleanups - writeback goes direct to bios rather than indirecting through bufferheads - transaction allocation cleanup - optimised kmem_realloc - added configurable error handling for metadata write errors, changed default error handling behaviour from "retry forever" to "retry until unmount then fail" - fixed several inode cluster writeback lookup vs reclaim race conditions - fixed inode cluster writeback checking wrong inode after lookup - fixed bugs where struct xfs_inode freeing wasn't actually RCU safe - cleaned up inode reclaim tagging" * tag 'xfs-for-linus-4.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs: (39 commits) xfs: fix warning in xfs_finish_page_writeback for non-debug builds xfs: move reclaim tagging functions xfs: simplify inode reclaim tagging interfaces xfs: rename variables in xfs_iflush_cluster for clarity xfs: xfs_iflush_cluster has range issues xfs: mark reclaimed inodes invalid earlier xfs: xfs_inode_free() isn't RCU safe xfs: optimise xfs_iext_destroy xfs: skip stale inodes in xfs_iflush_cluster xfs: fix inode validity check in xfs_iflush_cluster xfs: xfs_iflush_cluster fails to abort on error xfs: remove xfs_fs_evict_inode() xfs: add "fail at unmount" error handling configuration xfs: add configuration handlers for specific errors xfs: add configuration of error failure speed xfs: introduce table-based init for error behaviors xfs: add configurable error support to metadata buffers xfs: introduce metadata IO error class xfs: configurable error behavior via sysfs xfs: buffer ->bi_end_io function requires irq-safe lock ...
1757 lines
48 KiB
C
1757 lines
48 KiB
C
/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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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 <linux/gfp.h>
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#include <linux/mpage.h>
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#include <linux/pagevec.h>
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#include <linux/writeback.h>
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/* flags for direct write completions */
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#define XFS_DIO_FLAG_UNWRITTEN (1 << 0)
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#define XFS_DIO_FLAG_APPEND (1 << 1)
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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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bool imap_valid;
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unsigned int io_type;
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struct xfs_ioend *ioend;
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sector_t last_block;
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};
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void
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xfs_count_page_state(
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struct page *page,
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int *delalloc,
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int *unwritten)
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{
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struct buffer_head *bh, *head;
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*delalloc = *unwritten = 0;
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bh = head = page_buffers(page);
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do {
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if (buffer_unwritten(bh))
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(*unwritten) = 1;
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else if (buffer_delay(bh))
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(*delalloc) = 1;
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} while ((bh = bh->b_this_page) != head);
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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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/*
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* We're now finished for good with this page. Update the page state via the
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* associated buffer_heads, paying attention to the start and end offsets that
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* we need to process on the page.
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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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unsigned int end = bvec->bv_offset + bvec->bv_len - 1;
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struct buffer_head *head, *bh;
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unsigned int off = 0;
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ASSERT(bvec->bv_offset < PAGE_SIZE);
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ASSERT((bvec->bv_offset & ((1 << inode->i_blkbits) - 1)) == 0);
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ASSERT(end < PAGE_SIZE);
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ASSERT((bvec->bv_len & ((1 << inode->i_blkbits) - 1)) == 0);
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bh = head = page_buffers(bvec->bv_page);
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do {
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if (off < bvec->bv_offset)
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goto next_bh;
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if (off > end)
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break;
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bh->b_end_io(bh, !error);
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next_bh:
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off += bh->b_size;
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} while ((bh = bh->b_this_page) != head);
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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 *last = ioend->io_bio;
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struct bio *bio, *next;
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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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/*
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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)
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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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}
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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, 0, &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_FSTRANS);
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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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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_FSTRANS);
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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_io(
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struct work_struct *work)
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{
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struct xfs_ioend *ioend =
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container_of(work, struct xfs_ioend, io_work);
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struct xfs_inode *ip = XFS_I(ioend->io_inode);
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int error = ioend->io_bio->bi_error;
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/*
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* Set an error if the mount has shut down and proceed with end I/O
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* processing so it can perform whatever cleanups are necessary.
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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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/*
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* For unwritten extents we need to issue transactions to convert a
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* range to normal written extens after the data I/O has finished.
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* Detecting and handling completion IO errors is done individually
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* for each case as different cleanup operations need to be performed
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* on error.
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*/
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if (ioend->io_type == XFS_IO_UNWRITTEN) {
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if (error)
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goto done;
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error = xfs_iomap_write_unwritten(ip, ioend->io_offset,
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ioend->io_size);
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} else if (ioend->io_append_trans) {
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error = xfs_setfilesize_ioend(ioend, error);
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} else {
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ASSERT(!xfs_ioend_is_append(ioend));
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}
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done:
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xfs_destroy_ioend(ioend, error);
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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_mount *mp = XFS_I(ioend->io_inode)->i_mount;
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if (ioend->io_type == XFS_IO_UNWRITTEN)
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queue_work(mp->m_unwritten_workqueue, &ioend->io_work);
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else if (ioend->io_append_trans)
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queue_work(mp->m_data_workqueue, &ioend->io_work);
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else
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xfs_destroy_ioend(ioend, bio->bi_error);
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}
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STATIC int
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xfs_map_blocks(
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struct inode *inode,
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loff_t offset,
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struct xfs_bmbt_irec *imap,
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int type)
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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 = 1 << inode->i_blkbits;
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xfs_fileoff_t offset_fsb, end_fsb;
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int error = 0;
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int bmapi_flags = XFS_BMAPI_ENTIRE;
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int nimaps = 1;
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if (XFS_FORCED_SHUTDOWN(mp))
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return -EIO;
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if (type == XFS_IO_UNWRITTEN)
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bmapi_flags |= XFS_BMAPI_IGSTATE;
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xfs_ilock(ip, XFS_ILOCK_SHARED);
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ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
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(ip->i_df.if_flags & XFS_IFEXTENTS));
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ASSERT(offset <= mp->m_super->s_maxbytes);
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if (offset + count > mp->m_super->s_maxbytes)
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count = mp->m_super->s_maxbytes - offset;
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end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
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offset_fsb = XFS_B_TO_FSBT(mp, offset);
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error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb,
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imap, &nimaps, bmapi_flags);
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xfs_iunlock(ip, XFS_ILOCK_SHARED);
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if (error)
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return error;
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if (type == XFS_IO_DELALLOC &&
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(!nimaps || isnullstartblock(imap->br_startblock))) {
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error = xfs_iomap_write_allocate(ip, offset, imap);
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if (!error)
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trace_xfs_map_blocks_alloc(ip, offset, count, type, imap);
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return error;
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}
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#ifdef DEBUG
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if (type == XFS_IO_UNWRITTEN) {
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ASSERT(nimaps);
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ASSERT(imap->br_startblock != HOLESTARTBLOCK);
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ASSERT(imap->br_startblock != DELAYSTARTBLOCK);
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}
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#endif
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if (nimaps)
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trace_xfs_map_blocks_found(ip, offset, count, type, imap);
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return 0;
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}
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STATIC bool
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xfs_imap_valid(
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struct inode *inode,
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struct xfs_bmbt_irec *imap,
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xfs_off_t offset)
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{
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offset >>= inode->i_blkbits;
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return offset >= imap->br_startoff &&
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offset < imap->br_startoff + imap->br_blockcount;
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}
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STATIC void
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xfs_start_buffer_writeback(
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struct buffer_head *bh)
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{
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ASSERT(buffer_mapped(bh));
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ASSERT(buffer_locked(bh));
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ASSERT(!buffer_delay(bh));
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ASSERT(!buffer_unwritten(bh));
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mark_buffer_async_write(bh);
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set_buffer_uptodate(bh);
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clear_buffer_dirty(bh);
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}
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STATIC void
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xfs_start_page_writeback(
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struct page *page,
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int clear_dirty)
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{
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ASSERT(PageLocked(page));
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ASSERT(!PageWriteback(page));
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/*
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* if the page was not fully cleaned, we need to ensure that the higher
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* layers come back to it correctly. That means we need to keep the page
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* dirty, and for WB_SYNC_ALL writeback we need to ensure the
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* PAGECACHE_TAG_TOWRITE index mark is not removed so another attempt to
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* write this page in this writeback sweep will be made.
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*/
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if (clear_dirty) {
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clear_page_dirty_for_io(page);
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set_page_writeback(page);
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} else
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set_page_writeback_keepwrite(page);
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unlock_page(page);
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}
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static inline int xfs_bio_add_buffer(struct bio *bio, struct buffer_head *bh)
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{
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return bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh));
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}
|
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|
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/*
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* Submit the bio for an ioend. We are passed an ioend with a bio attached to
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* it, and we submit that bio. The ioend may be used for multiple bio
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* submissions, so we only want to allocate an append transaction for the ioend
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* once. In the case of multiple bio submission, each bio will take an IO
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* reference to the ioend to ensure that the ioend completion is only done once
|
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* all bios have been submitted and the ioend is really done.
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|
*
|
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* If @fail is non-zero, it means that we have a situation where some part of
|
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* the submission process has failed after we have marked paged for writeback
|
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* and unlocked them. In this situation, we need to fail the bio and ioend
|
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* rather than submit it to IO. This typically only happens on a filesystem
|
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* shutdown.
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*/
|
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STATIC int
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xfs_submit_ioend(
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struct writeback_control *wbc,
|
|
struct xfs_ioend *ioend,
|
|
int status)
|
|
{
|
|
/* Reserve log space if we might write beyond the on-disk inode size. */
|
|
if (!status &&
|
|
ioend->io_type != XFS_IO_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;
|
|
|
|
/*
|
|
* 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_error = status;
|
|
bio_endio(ioend->io_bio);
|
|
return status;
|
|
}
|
|
|
|
submit_bio(wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE,
|
|
ioend->io_bio);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
xfs_init_bio_from_bh(
|
|
struct bio *bio,
|
|
struct buffer_head *bh)
|
|
{
|
|
bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9);
|
|
bio->bi_bdev = bh->b_bdev;
|
|
}
|
|
|
|
static struct xfs_ioend *
|
|
xfs_alloc_ioend(
|
|
struct inode *inode,
|
|
unsigned int type,
|
|
xfs_off_t offset,
|
|
struct buffer_head *bh)
|
|
{
|
|
struct xfs_ioend *ioend;
|
|
struct bio *bio;
|
|
|
|
bio = bio_alloc_bioset(GFP_NOFS, BIO_MAX_PAGES, xfs_ioend_bioset);
|
|
xfs_init_bio_from_bh(bio, bh);
|
|
|
|
ioend = container_of(bio, struct xfs_ioend, io_inline_bio);
|
|
INIT_LIST_HEAD(&ioend->io_list);
|
|
ioend->io_type = type;
|
|
ioend->io_inode = inode;
|
|
ioend->io_size = 0;
|
|
ioend->io_offset = offset;
|
|
INIT_WORK(&ioend->io_work, xfs_end_io);
|
|
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 buffer_head *bh)
|
|
{
|
|
struct bio *new;
|
|
|
|
new = bio_alloc(GFP_NOFS, BIO_MAX_PAGES);
|
|
xfs_init_bio_from_bh(new, bh);
|
|
|
|
bio_chain(ioend->io_bio, new);
|
|
bio_get(ioend->io_bio); /* for xfs_destroy_ioend */
|
|
submit_bio(wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE,
|
|
ioend->io_bio);
|
|
ioend->io_bio = new;
|
|
}
|
|
|
|
/*
|
|
* Test to see if we've been building up a completion structure for
|
|
* earlier buffers -- if so, we try to append to this ioend if we
|
|
* can, otherwise we finish off any current ioend and start another.
|
|
* Return the ioend we finished off so that the caller can submit it
|
|
* once it has finished processing the dirty page.
|
|
*/
|
|
STATIC void
|
|
xfs_add_to_ioend(
|
|
struct inode *inode,
|
|
struct buffer_head *bh,
|
|
xfs_off_t offset,
|
|
struct xfs_writepage_ctx *wpc,
|
|
struct writeback_control *wbc,
|
|
struct list_head *iolist)
|
|
{
|
|
if (!wpc->ioend || wpc->io_type != wpc->ioend->io_type ||
|
|
bh->b_blocknr != wpc->last_block + 1 ||
|
|
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->io_type, offset, bh);
|
|
}
|
|
|
|
/*
|
|
* If the buffer doesn't fit into the bio we need to allocate a new
|
|
* one. This shouldn't happen more than once for a given buffer.
|
|
*/
|
|
while (xfs_bio_add_buffer(wpc->ioend->io_bio, bh) != bh->b_size)
|
|
xfs_chain_bio(wpc->ioend, wbc, bh);
|
|
|
|
wpc->ioend->io_size += bh->b_size;
|
|
wpc->last_block = bh->b_blocknr;
|
|
xfs_start_buffer_writeback(bh);
|
|
}
|
|
|
|
STATIC void
|
|
xfs_map_buffer(
|
|
struct inode *inode,
|
|
struct buffer_head *bh,
|
|
struct xfs_bmbt_irec *imap,
|
|
xfs_off_t offset)
|
|
{
|
|
sector_t bn;
|
|
struct xfs_mount *m = XFS_I(inode)->i_mount;
|
|
xfs_off_t iomap_offset = XFS_FSB_TO_B(m, imap->br_startoff);
|
|
xfs_daddr_t iomap_bn = xfs_fsb_to_db(XFS_I(inode), imap->br_startblock);
|
|
|
|
ASSERT(imap->br_startblock != HOLESTARTBLOCK);
|
|
ASSERT(imap->br_startblock != DELAYSTARTBLOCK);
|
|
|
|
bn = (iomap_bn >> (inode->i_blkbits - BBSHIFT)) +
|
|
((offset - iomap_offset) >> inode->i_blkbits);
|
|
|
|
ASSERT(bn || XFS_IS_REALTIME_INODE(XFS_I(inode)));
|
|
|
|
bh->b_blocknr = bn;
|
|
set_buffer_mapped(bh);
|
|
}
|
|
|
|
STATIC void
|
|
xfs_map_at_offset(
|
|
struct inode *inode,
|
|
struct buffer_head *bh,
|
|
struct xfs_bmbt_irec *imap,
|
|
xfs_off_t offset)
|
|
{
|
|
ASSERT(imap->br_startblock != HOLESTARTBLOCK);
|
|
ASSERT(imap->br_startblock != DELAYSTARTBLOCK);
|
|
|
|
xfs_map_buffer(inode, bh, imap, offset);
|
|
set_buffer_mapped(bh);
|
|
clear_buffer_delay(bh);
|
|
clear_buffer_unwritten(bh);
|
|
}
|
|
|
|
/*
|
|
* Test if a given page contains at least one buffer of a given @type.
|
|
* If @check_all_buffers is true, then we walk all the buffers in the page to
|
|
* try to find one of the type passed in. If it is not set, then the caller only
|
|
* needs to check the first buffer on the page for a match.
|
|
*/
|
|
STATIC bool
|
|
xfs_check_page_type(
|
|
struct page *page,
|
|
unsigned int type,
|
|
bool check_all_buffers)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct buffer_head *head;
|
|
|
|
if (PageWriteback(page))
|
|
return false;
|
|
if (!page->mapping)
|
|
return false;
|
|
if (!page_has_buffers(page))
|
|
return false;
|
|
|
|
bh = head = page_buffers(page);
|
|
do {
|
|
if (buffer_unwritten(bh)) {
|
|
if (type == XFS_IO_UNWRITTEN)
|
|
return true;
|
|
} else if (buffer_delay(bh)) {
|
|
if (type == XFS_IO_DELALLOC)
|
|
return true;
|
|
} else if (buffer_dirty(bh) && buffer_mapped(bh)) {
|
|
if (type == XFS_IO_OVERWRITE)
|
|
return true;
|
|
}
|
|
|
|
/* If we are only checking the first buffer, we are done now. */
|
|
if (!check_all_buffers)
|
|
break;
|
|
} while ((bh = bh->b_this_page) != head);
|
|
|
|
return false;
|
|
}
|
|
|
|
STATIC void
|
|
xfs_vm_invalidatepage(
|
|
struct page *page,
|
|
unsigned int offset,
|
|
unsigned int length)
|
|
{
|
|
trace_xfs_invalidatepage(page->mapping->host, page, offset,
|
|
length);
|
|
block_invalidatepage(page, offset, length);
|
|
}
|
|
|
|
/*
|
|
* If the page has delalloc buffers 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 a BUG() in xfs_get_blocks() later on if a direct IO read
|
|
* is done on that same region - the delalloc extent is returned when none is
|
|
* supposed to be there.
|
|
*
|
|
* We prevent this by truncating away the delalloc regions on the page before
|
|
* invalidating it. 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).
|
|
*
|
|
* This is not a performance critical path, so for now just do the punching a
|
|
* buffer head at a time.
|
|
*/
|
|
STATIC void
|
|
xfs_aops_discard_page(
|
|
struct page *page)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
struct buffer_head *bh, *head;
|
|
loff_t offset = page_offset(page);
|
|
|
|
if (!xfs_check_page_type(page, XFS_IO_DELALLOC, true))
|
|
goto out_invalidate;
|
|
|
|
if (XFS_FORCED_SHUTDOWN(ip->i_mount))
|
|
goto out_invalidate;
|
|
|
|
xfs_alert(ip->i_mount,
|
|
"page discard on page %p, inode 0x%llx, offset %llu.",
|
|
page, ip->i_ino, offset);
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
bh = head = page_buffers(page);
|
|
do {
|
|
int error;
|
|
xfs_fileoff_t start_fsb;
|
|
|
|
if (!buffer_delay(bh))
|
|
goto next_buffer;
|
|
|
|
start_fsb = XFS_B_TO_FSBT(ip->i_mount, offset);
|
|
error = xfs_bmap_punch_delalloc_range(ip, start_fsb, 1);
|
|
if (error) {
|
|
/* something screwed, just bail */
|
|
if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
|
|
xfs_alert(ip->i_mount,
|
|
"page discard unable to remove delalloc mapping.");
|
|
}
|
|
break;
|
|
}
|
|
next_buffer:
|
|
offset += 1 << inode->i_blkbits;
|
|
|
|
} while ((bh = bh->b_this_page) != head);
|
|
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
out_invalidate:
|
|
xfs_vm_invalidatepage(page, 0, PAGE_SIZE);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* 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 buffers to is cached on the writepage context, and if the new buffer
|
|
* 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,
|
|
loff_t offset,
|
|
__uint64_t end_offset)
|
|
{
|
|
LIST_HEAD(submit_list);
|
|
struct xfs_ioend *ioend, *next;
|
|
struct buffer_head *bh, *head;
|
|
ssize_t len = 1 << inode->i_blkbits;
|
|
int error = 0;
|
|
int count = 0;
|
|
int uptodate = 1;
|
|
|
|
bh = head = page_buffers(page);
|
|
offset = page_offset(page);
|
|
do {
|
|
if (offset >= end_offset)
|
|
break;
|
|
if (!buffer_uptodate(bh))
|
|
uptodate = 0;
|
|
|
|
/*
|
|
* set_page_dirty dirties all buffers in a page, independent
|
|
* of their state. The dirty state however is entirely
|
|
* meaningless for holes (!mapped && uptodate), so skip
|
|
* buffers covering holes here.
|
|
*/
|
|
if (!buffer_mapped(bh) && buffer_uptodate(bh)) {
|
|
wpc->imap_valid = false;
|
|
continue;
|
|
}
|
|
|
|
if (buffer_unwritten(bh)) {
|
|
if (wpc->io_type != XFS_IO_UNWRITTEN) {
|
|
wpc->io_type = XFS_IO_UNWRITTEN;
|
|
wpc->imap_valid = false;
|
|
}
|
|
} else if (buffer_delay(bh)) {
|
|
if (wpc->io_type != XFS_IO_DELALLOC) {
|
|
wpc->io_type = XFS_IO_DELALLOC;
|
|
wpc->imap_valid = false;
|
|
}
|
|
} else if (buffer_uptodate(bh)) {
|
|
if (wpc->io_type != XFS_IO_OVERWRITE) {
|
|
wpc->io_type = XFS_IO_OVERWRITE;
|
|
wpc->imap_valid = false;
|
|
}
|
|
} else {
|
|
if (PageUptodate(page))
|
|
ASSERT(buffer_mapped(bh));
|
|
/*
|
|
* This buffer is not uptodate and will not be
|
|
* written to disk. Ensure that we will put any
|
|
* subsequent writeable buffers into a new
|
|
* ioend.
|
|
*/
|
|
wpc->imap_valid = false;
|
|
continue;
|
|
}
|
|
|
|
if (wpc->imap_valid)
|
|
wpc->imap_valid = xfs_imap_valid(inode, &wpc->imap,
|
|
offset);
|
|
if (!wpc->imap_valid) {
|
|
error = xfs_map_blocks(inode, offset, &wpc->imap,
|
|
wpc->io_type);
|
|
if (error)
|
|
goto out;
|
|
wpc->imap_valid = xfs_imap_valid(inode, &wpc->imap,
|
|
offset);
|
|
}
|
|
if (wpc->imap_valid) {
|
|
lock_buffer(bh);
|
|
if (wpc->io_type != XFS_IO_OVERWRITE)
|
|
xfs_map_at_offset(inode, bh, &wpc->imap, offset);
|
|
xfs_add_to_ioend(inode, bh, offset, wpc, wbc, &submit_list);
|
|
count++;
|
|
}
|
|
|
|
} while (offset += len, ((bh = bh->b_this_page) != head));
|
|
|
|
if (uptodate && bh == head)
|
|
SetPageUptodate(page);
|
|
|
|
ASSERT(wpc->ioend || list_empty(&submit_list));
|
|
|
|
out:
|
|
/*
|
|
* On error, we have to fail the ioend here because we have locked
|
|
* buffers in the ioend. If we don't do this, we'll deadlock
|
|
* invalidating the page as that tries to lock the buffers on the page.
|
|
* Also, 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
|
|
* buffers 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
|
|
* or it's buffers right now. The caller will still need to trigger
|
|
* submission of outstanding ioends on the writepage context so they are
|
|
* treated correctly on error.
|
|
*/
|
|
if (count) {
|
|
xfs_start_page_writeback(page, !error);
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
} else if (error) {
|
|
xfs_aops_discard_page(page);
|
|
ClearPageUptodate(page);
|
|
unlock_page(page);
|
|
} else {
|
|
/*
|
|
* We can end up here with no error and nothing to write if we
|
|
* race with a partial page truncate on a sub-page block sized
|
|
* filesystem. In that case we need to mark the page clean.
|
|
*/
|
|
xfs_start_page_writeback(page, 1);
|
|
end_page_writeback(page);
|
|
}
|
|
|
|
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.
|
|
* For any other dirty buffer heads on the page we should flush them.
|
|
*/
|
|
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);
|
|
|
|
ASSERT(page_has_buffers(page));
|
|
|
|
/*
|
|
* 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_FSTRANS))
|
|
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, offset, 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 = {
|
|
.io_type = XFS_IO_INVALID,
|
|
};
|
|
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 = {
|
|
.io_type = XFS_IO_INVALID,
|
|
};
|
|
int ret;
|
|
|
|
xfs_iflags_clear(XFS_I(mapping->host), XFS_ITRUNCATED);
|
|
if (dax_mapping(mapping))
|
|
return dax_writeback_mapping_range(mapping,
|
|
xfs_find_bdev_for_inode(mapping->host), wbc);
|
|
|
|
ret = write_cache_pages(mapping, wbc, xfs_do_writepage, &wpc);
|
|
if (wpc.ioend)
|
|
ret = xfs_submit_ioend(wbc, wpc.ioend, ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Called to move a page into cleanable state - and from there
|
|
* to be released. The page should already be clean. We always
|
|
* have buffer heads in this call.
|
|
*
|
|
* Returns 1 if the page is ok to release, 0 otherwise.
|
|
*/
|
|
STATIC int
|
|
xfs_vm_releasepage(
|
|
struct page *page,
|
|
gfp_t gfp_mask)
|
|
{
|
|
int delalloc, unwritten;
|
|
|
|
trace_xfs_releasepage(page->mapping->host, page, 0, 0);
|
|
|
|
xfs_count_page_state(page, &delalloc, &unwritten);
|
|
|
|
if (WARN_ON_ONCE(delalloc))
|
|
return 0;
|
|
if (WARN_ON_ONCE(unwritten))
|
|
return 0;
|
|
|
|
return try_to_free_buffers(page);
|
|
}
|
|
|
|
/*
|
|
* When we map a DIO buffer, we may need to pass flags to
|
|
* xfs_end_io_direct_write to tell it what kind of write IO we are doing.
|
|
*
|
|
* Note that for DIO, an IO to the highest supported file block offset (i.e.
|
|
* 2^63 - 1FSB bytes) will result in the offset + count overflowing a signed 64
|
|
* bit variable. Hence if we see this overflow, we have to assume that the IO is
|
|
* extending the file size. We won't know for sure until IO completion is run
|
|
* and the actual max write offset is communicated to the IO completion
|
|
* routine.
|
|
*/
|
|
static void
|
|
xfs_map_direct(
|
|
struct inode *inode,
|
|
struct buffer_head *bh_result,
|
|
struct xfs_bmbt_irec *imap,
|
|
xfs_off_t offset)
|
|
{
|
|
uintptr_t *flags = (uintptr_t *)&bh_result->b_private;
|
|
xfs_off_t size = bh_result->b_size;
|
|
|
|
trace_xfs_get_blocks_map_direct(XFS_I(inode), offset, size,
|
|
ISUNWRITTEN(imap) ? XFS_IO_UNWRITTEN : XFS_IO_OVERWRITE, imap);
|
|
|
|
if (ISUNWRITTEN(imap)) {
|
|
*flags |= XFS_DIO_FLAG_UNWRITTEN;
|
|
set_buffer_defer_completion(bh_result);
|
|
} else if (offset + size > i_size_read(inode) || offset + size < 0) {
|
|
*flags |= XFS_DIO_FLAG_APPEND;
|
|
set_buffer_defer_completion(bh_result);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If this is O_DIRECT or the mpage code calling tell them how large the mapping
|
|
* is, so that we can avoid repeated get_blocks calls.
|
|
*
|
|
* If the mapping spans EOF, then we have to break the mapping up as the mapping
|
|
* for blocks beyond EOF must be marked new so that sub block regions can be
|
|
* correctly zeroed. We can't do this for mappings within EOF unless the mapping
|
|
* was just allocated or is unwritten, otherwise the callers would overwrite
|
|
* existing data with zeros. Hence we have to split the mapping into a range up
|
|
* to and including EOF, and a second mapping for beyond EOF.
|
|
*/
|
|
static void
|
|
xfs_map_trim_size(
|
|
struct inode *inode,
|
|
sector_t iblock,
|
|
struct buffer_head *bh_result,
|
|
struct xfs_bmbt_irec *imap,
|
|
xfs_off_t offset,
|
|
ssize_t size)
|
|
{
|
|
xfs_off_t mapping_size;
|
|
|
|
mapping_size = imap->br_startoff + imap->br_blockcount - iblock;
|
|
mapping_size <<= inode->i_blkbits;
|
|
|
|
ASSERT(mapping_size > 0);
|
|
if (mapping_size > size)
|
|
mapping_size = size;
|
|
if (offset < i_size_read(inode) &&
|
|
offset + mapping_size >= i_size_read(inode)) {
|
|
/* limit mapping to block that spans EOF */
|
|
mapping_size = roundup_64(i_size_read(inode) - offset,
|
|
1 << inode->i_blkbits);
|
|
}
|
|
if (mapping_size > LONG_MAX)
|
|
mapping_size = LONG_MAX;
|
|
|
|
bh_result->b_size = mapping_size;
|
|
}
|
|
|
|
STATIC int
|
|
__xfs_get_blocks(
|
|
struct inode *inode,
|
|
sector_t iblock,
|
|
struct buffer_head *bh_result,
|
|
int create,
|
|
bool direct,
|
|
bool dax_fault)
|
|
{
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
xfs_fileoff_t offset_fsb, end_fsb;
|
|
int error = 0;
|
|
int lockmode = 0;
|
|
struct xfs_bmbt_irec imap;
|
|
int nimaps = 1;
|
|
xfs_off_t offset;
|
|
ssize_t size;
|
|
int new = 0;
|
|
|
|
if (XFS_FORCED_SHUTDOWN(mp))
|
|
return -EIO;
|
|
|
|
offset = (xfs_off_t)iblock << inode->i_blkbits;
|
|
ASSERT(bh_result->b_size >= (1 << inode->i_blkbits));
|
|
size = bh_result->b_size;
|
|
|
|
if (!create && direct && offset >= i_size_read(inode))
|
|
return 0;
|
|
|
|
/*
|
|
* Direct I/O is usually done on preallocated files, so try getting
|
|
* a block mapping without an exclusive lock first. For buffered
|
|
* writes we already have the exclusive iolock anyway, so avoiding
|
|
* a lock roundtrip here by taking the ilock exclusive from the
|
|
* beginning is a useful micro optimization.
|
|
*/
|
|
if (create && !direct) {
|
|
lockmode = XFS_ILOCK_EXCL;
|
|
xfs_ilock(ip, lockmode);
|
|
} else {
|
|
lockmode = xfs_ilock_data_map_shared(ip);
|
|
}
|
|
|
|
ASSERT(offset <= mp->m_super->s_maxbytes);
|
|
if (offset + size > mp->m_super->s_maxbytes)
|
|
size = mp->m_super->s_maxbytes - offset;
|
|
end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + size);
|
|
offset_fsb = XFS_B_TO_FSBT(mp, offset);
|
|
|
|
error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb,
|
|
&imap, &nimaps, XFS_BMAPI_ENTIRE);
|
|
if (error)
|
|
goto out_unlock;
|
|
|
|
/* for DAX, we convert unwritten extents directly */
|
|
if (create &&
|
|
(!nimaps ||
|
|
(imap.br_startblock == HOLESTARTBLOCK ||
|
|
imap.br_startblock == DELAYSTARTBLOCK) ||
|
|
(IS_DAX(inode) && ISUNWRITTEN(&imap)))) {
|
|
if (direct || xfs_get_extsz_hint(ip)) {
|
|
/*
|
|
* xfs_iomap_write_direct() expects the shared lock. It
|
|
* is unlocked on return.
|
|
*/
|
|
if (lockmode == XFS_ILOCK_EXCL)
|
|
xfs_ilock_demote(ip, lockmode);
|
|
|
|
error = xfs_iomap_write_direct(ip, offset, size,
|
|
&imap, nimaps);
|
|
if (error)
|
|
return error;
|
|
new = 1;
|
|
|
|
} else {
|
|
/*
|
|
* Delalloc reservations do not require a transaction,
|
|
* we can go on without dropping the lock here. If we
|
|
* are allocating a new delalloc block, make sure that
|
|
* we set the new flag so that we mark the buffer new so
|
|
* that we know that it is newly allocated if the write
|
|
* fails.
|
|
*/
|
|
if (nimaps && imap.br_startblock == HOLESTARTBLOCK)
|
|
new = 1;
|
|
error = xfs_iomap_write_delay(ip, offset, size, &imap);
|
|
if (error)
|
|
goto out_unlock;
|
|
|
|
xfs_iunlock(ip, lockmode);
|
|
}
|
|
trace_xfs_get_blocks_alloc(ip, offset, size,
|
|
ISUNWRITTEN(&imap) ? XFS_IO_UNWRITTEN
|
|
: XFS_IO_DELALLOC, &imap);
|
|
} else if (nimaps) {
|
|
trace_xfs_get_blocks_found(ip, offset, size,
|
|
ISUNWRITTEN(&imap) ? XFS_IO_UNWRITTEN
|
|
: XFS_IO_OVERWRITE, &imap);
|
|
xfs_iunlock(ip, lockmode);
|
|
} else {
|
|
trace_xfs_get_blocks_notfound(ip, offset, size);
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (IS_DAX(inode) && create) {
|
|
ASSERT(!ISUNWRITTEN(&imap));
|
|
/* zeroing is not needed at a higher layer */
|
|
new = 0;
|
|
}
|
|
|
|
/* trim mapping down to size requested */
|
|
if (direct || size > (1 << inode->i_blkbits))
|
|
xfs_map_trim_size(inode, iblock, bh_result,
|
|
&imap, offset, size);
|
|
|
|
/*
|
|
* For unwritten extents do not report a disk address in the buffered
|
|
* read case (treat as if we're reading into a hole).
|
|
*/
|
|
if (imap.br_startblock != HOLESTARTBLOCK &&
|
|
imap.br_startblock != DELAYSTARTBLOCK &&
|
|
(create || !ISUNWRITTEN(&imap))) {
|
|
xfs_map_buffer(inode, bh_result, &imap, offset);
|
|
if (ISUNWRITTEN(&imap))
|
|
set_buffer_unwritten(bh_result);
|
|
/* direct IO needs special help */
|
|
if (create && direct) {
|
|
if (dax_fault)
|
|
ASSERT(!ISUNWRITTEN(&imap));
|
|
else
|
|
xfs_map_direct(inode, bh_result, &imap, offset);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If this is a realtime file, data may be on a different device.
|
|
* to that pointed to from the buffer_head b_bdev currently.
|
|
*/
|
|
bh_result->b_bdev = xfs_find_bdev_for_inode(inode);
|
|
|
|
/*
|
|
* If we previously allocated a block out beyond eof and we are now
|
|
* coming back to use it then we will need to flag it as new even if it
|
|
* has a disk address.
|
|
*
|
|
* With sub-block writes into unwritten extents we also need to mark
|
|
* the buffer as new so that the unwritten parts of the buffer gets
|
|
* correctly zeroed.
|
|
*/
|
|
if (create &&
|
|
((!buffer_mapped(bh_result) && !buffer_uptodate(bh_result)) ||
|
|
(offset >= i_size_read(inode)) ||
|
|
(new || ISUNWRITTEN(&imap))))
|
|
set_buffer_new(bh_result);
|
|
|
|
if (imap.br_startblock == DELAYSTARTBLOCK) {
|
|
BUG_ON(direct);
|
|
if (create) {
|
|
set_buffer_uptodate(bh_result);
|
|
set_buffer_mapped(bh_result);
|
|
set_buffer_delay(bh_result);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_unlock:
|
|
xfs_iunlock(ip, lockmode);
|
|
return error;
|
|
}
|
|
|
|
int
|
|
xfs_get_blocks(
|
|
struct inode *inode,
|
|
sector_t iblock,
|
|
struct buffer_head *bh_result,
|
|
int create)
|
|
{
|
|
return __xfs_get_blocks(inode, iblock, bh_result, create, false, false);
|
|
}
|
|
|
|
int
|
|
xfs_get_blocks_direct(
|
|
struct inode *inode,
|
|
sector_t iblock,
|
|
struct buffer_head *bh_result,
|
|
int create)
|
|
{
|
|
return __xfs_get_blocks(inode, iblock, bh_result, create, true, false);
|
|
}
|
|
|
|
int
|
|
xfs_get_blocks_dax_fault(
|
|
struct inode *inode,
|
|
sector_t iblock,
|
|
struct buffer_head *bh_result,
|
|
int create)
|
|
{
|
|
return __xfs_get_blocks(inode, iblock, bh_result, create, true, true);
|
|
}
|
|
|
|
/*
|
|
* Complete a direct I/O write request.
|
|
*
|
|
* xfs_map_direct passes us some flags in the private data to tell us what to
|
|
* do. If no flags are set, then the write IO is an overwrite wholly within
|
|
* the existing allocated file size and so there is nothing for us to do.
|
|
*
|
|
* Note that in this case the completion can be called in interrupt context,
|
|
* whereas if we have flags set we will always be called in task context
|
|
* (i.e. from a workqueue).
|
|
*/
|
|
STATIC int
|
|
xfs_end_io_direct_write(
|
|
struct kiocb *iocb,
|
|
loff_t offset,
|
|
ssize_t size,
|
|
void *private)
|
|
{
|
|
struct inode *inode = file_inode(iocb->ki_filp);
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
uintptr_t flags = (uintptr_t)private;
|
|
int error = 0;
|
|
|
|
trace_xfs_end_io_direct_write(ip, offset, size);
|
|
|
|
if (XFS_FORCED_SHUTDOWN(mp))
|
|
return -EIO;
|
|
|
|
if (size <= 0)
|
|
return size;
|
|
|
|
/*
|
|
* The flags tell us whether we are doing unwritten extent conversions
|
|
* or an append transaction that updates the on-disk file size. These
|
|
* cases are the only cases where we should *potentially* be needing
|
|
* to update the VFS inode size.
|
|
*/
|
|
if (flags == 0) {
|
|
ASSERT(offset + size <= i_size_read(inode));
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* We need to update the in-core inode size here so that we don't end up
|
|
* with the on-disk inode size being outside the in-core inode size. We
|
|
* have no other method of updating EOF for AIO, so always do it here
|
|
* if necessary.
|
|
*
|
|
* We need to lock the test/set EOF update as we can be racing with
|
|
* other IO completions here to update the EOF. Failing to serialise
|
|
* here can result in EOF moving backwards and Bad Things Happen when
|
|
* that occurs.
|
|
*/
|
|
spin_lock(&ip->i_flags_lock);
|
|
if (offset + size > i_size_read(inode))
|
|
i_size_write(inode, offset + size);
|
|
spin_unlock(&ip->i_flags_lock);
|
|
|
|
if (flags & XFS_DIO_FLAG_UNWRITTEN) {
|
|
trace_xfs_end_io_direct_write_unwritten(ip, offset, size);
|
|
|
|
error = xfs_iomap_write_unwritten(ip, offset, size);
|
|
} else if (flags & XFS_DIO_FLAG_APPEND) {
|
|
struct xfs_trans *tp;
|
|
|
|
trace_xfs_end_io_direct_write_append(ip, offset, size);
|
|
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0,
|
|
&tp);
|
|
if (!error)
|
|
error = xfs_setfilesize(ip, tp, offset, size);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
STATIC ssize_t
|
|
xfs_vm_direct_IO(
|
|
struct kiocb *iocb,
|
|
struct iov_iter *iter)
|
|
{
|
|
struct inode *inode = iocb->ki_filp->f_mapping->host;
|
|
dio_iodone_t *endio = NULL;
|
|
int flags = 0;
|
|
struct block_device *bdev;
|
|
|
|
if (iov_iter_rw(iter) == WRITE) {
|
|
endio = xfs_end_io_direct_write;
|
|
flags = DIO_ASYNC_EXTEND;
|
|
}
|
|
|
|
if (IS_DAX(inode)) {
|
|
return dax_do_io(iocb, inode, iter,
|
|
xfs_get_blocks_direct, endio, 0);
|
|
}
|
|
|
|
bdev = xfs_find_bdev_for_inode(inode);
|
|
return __blockdev_direct_IO(iocb, inode, bdev, iter,
|
|
xfs_get_blocks_direct, endio, NULL, flags);
|
|
}
|
|
|
|
/*
|
|
* Punch out the delalloc blocks we have already allocated.
|
|
*
|
|
* Don't bother with xfs_setattr given that nothing can have made it to disk yet
|
|
* as the page is still locked at this point.
|
|
*/
|
|
STATIC void
|
|
xfs_vm_kill_delalloc_range(
|
|
struct inode *inode,
|
|
loff_t start,
|
|
loff_t end)
|
|
{
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
xfs_fileoff_t start_fsb;
|
|
xfs_fileoff_t end_fsb;
|
|
int error;
|
|
|
|
start_fsb = XFS_B_TO_FSB(ip->i_mount, start);
|
|
end_fsb = XFS_B_TO_FSB(ip->i_mount, end);
|
|
if (end_fsb <= start_fsb)
|
|
return;
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
error = xfs_bmap_punch_delalloc_range(ip, start_fsb,
|
|
end_fsb - start_fsb);
|
|
if (error) {
|
|
/* something screwed, just bail */
|
|
if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
|
|
xfs_alert(ip->i_mount,
|
|
"xfs_vm_write_failed: unable to clean up ino %lld",
|
|
ip->i_ino);
|
|
}
|
|
}
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
}
|
|
|
|
STATIC void
|
|
xfs_vm_write_failed(
|
|
struct inode *inode,
|
|
struct page *page,
|
|
loff_t pos,
|
|
unsigned len)
|
|
{
|
|
loff_t block_offset;
|
|
loff_t block_start;
|
|
loff_t block_end;
|
|
loff_t from = pos & (PAGE_SIZE - 1);
|
|
loff_t to = from + len;
|
|
struct buffer_head *bh, *head;
|
|
struct xfs_mount *mp = XFS_I(inode)->i_mount;
|
|
|
|
/*
|
|
* The request pos offset might be 32 or 64 bit, this is all fine
|
|
* on 64-bit platform. However, for 64-bit pos request on 32-bit
|
|
* platform, the high 32-bit will be masked off if we evaluate the
|
|
* block_offset via (pos & PAGE_MASK) because the PAGE_MASK is
|
|
* 0xfffff000 as an unsigned long, hence the result is incorrect
|
|
* which could cause the following ASSERT failed in most cases.
|
|
* In order to avoid this, we can evaluate the block_offset of the
|
|
* start of the page by using shifts rather than masks the mismatch
|
|
* problem.
|
|
*/
|
|
block_offset = (pos >> PAGE_SHIFT) << PAGE_SHIFT;
|
|
|
|
ASSERT(block_offset + from == pos);
|
|
|
|
head = page_buffers(page);
|
|
block_start = 0;
|
|
for (bh = head; bh != head || !block_start;
|
|
bh = bh->b_this_page, block_start = block_end,
|
|
block_offset += bh->b_size) {
|
|
block_end = block_start + bh->b_size;
|
|
|
|
/* skip buffers before the write */
|
|
if (block_end <= from)
|
|
continue;
|
|
|
|
/* if the buffer is after the write, we're done */
|
|
if (block_start >= to)
|
|
break;
|
|
|
|
/*
|
|
* Process delalloc and unwritten buffers beyond EOF. We can
|
|
* encounter unwritten buffers in the event that a file has
|
|
* post-EOF unwritten extents and an extending write happens to
|
|
* fail (e.g., an unaligned write that also involves a delalloc
|
|
* to the same page).
|
|
*/
|
|
if (!buffer_delay(bh) && !buffer_unwritten(bh))
|
|
continue;
|
|
|
|
if (!xfs_mp_fail_writes(mp) && !buffer_new(bh) &&
|
|
block_offset < i_size_read(inode))
|
|
continue;
|
|
|
|
if (buffer_delay(bh))
|
|
xfs_vm_kill_delalloc_range(inode, block_offset,
|
|
block_offset + bh->b_size);
|
|
|
|
/*
|
|
* This buffer does not contain data anymore. make sure anyone
|
|
* who finds it knows that for certain.
|
|
*/
|
|
clear_buffer_delay(bh);
|
|
clear_buffer_uptodate(bh);
|
|
clear_buffer_mapped(bh);
|
|
clear_buffer_new(bh);
|
|
clear_buffer_dirty(bh);
|
|
clear_buffer_unwritten(bh);
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
* This used to call block_write_begin(), but it unlocks and releases the page
|
|
* on error, and we need that page to be able to punch stale delalloc blocks out
|
|
* on failure. hence we copy-n-waste it here and call xfs_vm_write_failed() at
|
|
* the appropriate point.
|
|
*/
|
|
STATIC int
|
|
xfs_vm_write_begin(
|
|
struct file *file,
|
|
struct address_space *mapping,
|
|
loff_t pos,
|
|
unsigned len,
|
|
unsigned flags,
|
|
struct page **pagep,
|
|
void **fsdata)
|
|
{
|
|
pgoff_t index = pos >> PAGE_SHIFT;
|
|
struct page *page;
|
|
int status;
|
|
struct xfs_mount *mp = XFS_I(mapping->host)->i_mount;
|
|
|
|
ASSERT(len <= PAGE_SIZE);
|
|
|
|
page = grab_cache_page_write_begin(mapping, index, flags);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
|
|
status = __block_write_begin(page, pos, len, xfs_get_blocks);
|
|
if (xfs_mp_fail_writes(mp))
|
|
status = -EIO;
|
|
if (unlikely(status)) {
|
|
struct inode *inode = mapping->host;
|
|
size_t isize = i_size_read(inode);
|
|
|
|
xfs_vm_write_failed(inode, page, pos, len);
|
|
unlock_page(page);
|
|
|
|
/*
|
|
* If the write is beyond EOF, we only want to kill blocks
|
|
* allocated in this write, not blocks that were previously
|
|
* written successfully.
|
|
*/
|
|
if (xfs_mp_fail_writes(mp))
|
|
isize = 0;
|
|
if (pos + len > isize) {
|
|
ssize_t start = max_t(ssize_t, pos, isize);
|
|
|
|
truncate_pagecache_range(inode, start, pos + len);
|
|
}
|
|
|
|
put_page(page);
|
|
page = NULL;
|
|
}
|
|
|
|
*pagep = page;
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* On failure, we only need to kill delalloc blocks beyond EOF in the range of
|
|
* this specific write because they will never be written. Previous writes
|
|
* beyond EOF where block allocation succeeded do not need to be trashed, so
|
|
* only new blocks from this write should be trashed. For blocks within
|
|
* EOF, generic_write_end() zeros them so they are safe to leave alone and be
|
|
* written with all the other valid data.
|
|
*/
|
|
STATIC int
|
|
xfs_vm_write_end(
|
|
struct file *file,
|
|
struct address_space *mapping,
|
|
loff_t pos,
|
|
unsigned len,
|
|
unsigned copied,
|
|
struct page *page,
|
|
void *fsdata)
|
|
{
|
|
int ret;
|
|
|
|
ASSERT(len <= PAGE_SIZE);
|
|
|
|
ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
|
|
if (unlikely(ret < len)) {
|
|
struct inode *inode = mapping->host;
|
|
size_t isize = i_size_read(inode);
|
|
loff_t to = pos + len;
|
|
|
|
if (to > isize) {
|
|
/* only kill blocks in this write beyond EOF */
|
|
if (pos > isize)
|
|
isize = pos;
|
|
xfs_vm_kill_delalloc_range(inode, isize, to);
|
|
truncate_pagecache_range(inode, isize, to);
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
STATIC sector_t
|
|
xfs_vm_bmap(
|
|
struct address_space *mapping,
|
|
sector_t block)
|
|
{
|
|
struct inode *inode = (struct inode *)mapping->host;
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
|
|
trace_xfs_vm_bmap(XFS_I(inode));
|
|
xfs_ilock(ip, XFS_IOLOCK_SHARED);
|
|
filemap_write_and_wait(mapping);
|
|
xfs_iunlock(ip, XFS_IOLOCK_SHARED);
|
|
return generic_block_bmap(mapping, block, xfs_get_blocks);
|
|
}
|
|
|
|
STATIC int
|
|
xfs_vm_readpage(
|
|
struct file *unused,
|
|
struct page *page)
|
|
{
|
|
trace_xfs_vm_readpage(page->mapping->host, 1);
|
|
return mpage_readpage(page, xfs_get_blocks);
|
|
}
|
|
|
|
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 mpage_readpages(mapping, pages, nr_pages, xfs_get_blocks);
|
|
}
|
|
|
|
/*
|
|
* This is basically a copy of __set_page_dirty_buffers() with one
|
|
* small tweak: buffers beyond EOF do not get marked dirty. If we mark them
|
|
* dirty, we'll never be able to clean them because we don't write buffers
|
|
* beyond EOF, and that means we can't invalidate pages that span EOF
|
|
* that have been marked dirty. Further, the dirty state can leak into
|
|
* the file interior if the file is extended, resulting in all sorts of
|
|
* bad things happening as the state does not match the underlying data.
|
|
*
|
|
* XXX: this really indicates that bufferheads in XFS need to die. Warts like
|
|
* this only exist because of bufferheads and how the generic code manages them.
|
|
*/
|
|
STATIC int
|
|
xfs_vm_set_page_dirty(
|
|
struct page *page)
|
|
{
|
|
struct address_space *mapping = page->mapping;
|
|
struct inode *inode = mapping->host;
|
|
loff_t end_offset;
|
|
loff_t offset;
|
|
int newly_dirty;
|
|
|
|
if (unlikely(!mapping))
|
|
return !TestSetPageDirty(page);
|
|
|
|
end_offset = i_size_read(inode);
|
|
offset = page_offset(page);
|
|
|
|
spin_lock(&mapping->private_lock);
|
|
if (page_has_buffers(page)) {
|
|
struct buffer_head *head = page_buffers(page);
|
|
struct buffer_head *bh = head;
|
|
|
|
do {
|
|
if (offset < end_offset)
|
|
set_buffer_dirty(bh);
|
|
bh = bh->b_this_page;
|
|
offset += 1 << inode->i_blkbits;
|
|
} while (bh != head);
|
|
}
|
|
/*
|
|
* Lock out page->mem_cgroup migration to keep PageDirty
|
|
* synchronized with per-memcg dirty page counters.
|
|
*/
|
|
lock_page_memcg(page);
|
|
newly_dirty = !TestSetPageDirty(page);
|
|
spin_unlock(&mapping->private_lock);
|
|
|
|
if (newly_dirty) {
|
|
/* sigh - __set_page_dirty() is static, so copy it here, too */
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&mapping->tree_lock, flags);
|
|
if (page->mapping) { /* Race with truncate? */
|
|
WARN_ON_ONCE(!PageUptodate(page));
|
|
account_page_dirtied(page, mapping);
|
|
radix_tree_tag_set(&mapping->page_tree,
|
|
page_index(page), PAGECACHE_TAG_DIRTY);
|
|
}
|
|
spin_unlock_irqrestore(&mapping->tree_lock, flags);
|
|
}
|
|
unlock_page_memcg(page);
|
|
if (newly_dirty)
|
|
__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
|
|
return newly_dirty;
|
|
}
|
|
|
|
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 = xfs_vm_set_page_dirty,
|
|
.releasepage = xfs_vm_releasepage,
|
|
.invalidatepage = xfs_vm_invalidatepage,
|
|
.write_begin = xfs_vm_write_begin,
|
|
.write_end = xfs_vm_write_end,
|
|
.bmap = xfs_vm_bmap,
|
|
.direct_IO = xfs_vm_direct_IO,
|
|
.migratepage = buffer_migrate_page,
|
|
.is_partially_uptodate = block_is_partially_uptodate,
|
|
.error_remove_page = generic_error_remove_page,
|
|
};
|