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![Brian Foster](/assets/img/avatar_default.png)
The only remaining user of ->io_private is the generic ioend merging infrastructure. The only user of that is XFS, which no longer sets ->io_private or passes an associated merge callback. Remove the unused parameter and the ->io_private field. CC: linux-fsdevel@vger.kernel.org Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Darrick J. Wong <djwong@kernel.org>
581 lines
16 KiB
C
581 lines
16 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_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_reflink.h"
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struct xfs_writepage_ctx {
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struct iomap_writepage_ctx ctx;
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unsigned int data_seq;
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unsigned int cow_seq;
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};
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static inline struct xfs_writepage_ctx *
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XFS_WPC(struct iomap_writepage_ctx *ctx)
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{
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return container_of(ctx, struct xfs_writepage_ctx, ctx);
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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 iomap_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_disk_size;
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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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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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xfs_fsize_t isize;
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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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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_disk_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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/*
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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 iomap_ioend *ioend)
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{
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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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unsigned int nofs_flag;
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int error;
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/*
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* We can allocate memory here while doing writeback on behalf of
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* memory reclaim. To avoid memory allocation deadlocks set the
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* task-wide nofs context for the following operations.
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*/
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nofs_flag = memalloc_nofs_save();
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/*
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* Just clean up the in-memory structures 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_flags & IOMAP_F_SHARED)
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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_flags & IOMAP_F_SHARED)
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error = xfs_reflink_end_cow(ip, offset, size);
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else if (ioend->io_type == IOMAP_UNWRITTEN)
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error = xfs_iomap_write_unwritten(ip, offset, size, false);
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if (!error && xfs_ioend_is_append(ioend))
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error = xfs_setfilesize(ip, ioend->io_offset, ioend->io_size);
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done:
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iomap_finish_ioends(ioend, error);
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memalloc_nofs_restore(nofs_flag);
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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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container_of(work, struct xfs_inode, i_ioend_work);
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struct iomap_ioend *ioend;
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struct list_head tmp;
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unsigned long flags;
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spin_lock_irqsave(&ip->i_ioend_lock, flags);
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list_replace_init(&ip->i_ioend_list, &tmp);
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spin_unlock_irqrestore(&ip->i_ioend_lock, flags);
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iomap_sort_ioends(&tmp);
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while ((ioend = list_first_entry_or_null(&tmp, struct iomap_ioend,
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io_list))) {
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list_del_init(&ioend->io_list);
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iomap_ioend_try_merge(ioend, &tmp);
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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 iomap_ioend *ioend = bio->bi_private;
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struct xfs_inode *ip = XFS_I(ioend->io_inode);
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unsigned long flags;
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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(ip->i_mount->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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}
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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 iomap_writepage_ctx *wpc,
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struct xfs_inode *ip,
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loff_t offset)
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{
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if (offset < wpc->iomap.offset ||
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offset >= wpc->iomap.offset + wpc->iomap.length)
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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->iomap.flags & IOMAP_F_SHARED)
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return true;
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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 (XFS_WPC(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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XFS_WPC(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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* 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->iomap.
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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 iomap_writepage_ctx *wpc,
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struct xfs_inode *ip,
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int whichfork,
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loff_t offset)
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{
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int error;
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unsigned *seq;
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if (whichfork == XFS_COW_FORK)
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seq = &XFS_WPC(wpc)->cow_seq;
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else
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seq = &XFS_WPC(wpc)->data_seq;
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/*
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* Attempt to allocate whatever delalloc extent currently backs offset
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* and put the result into wpc->iomap. Allocate in a loop because it
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* may take several attempts to allocate real blocks for a contiguous
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* 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, whichfork, offset,
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&wpc->iomap, seq);
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if (error)
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return error;
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} while (wpc->iomap.offset + wpc->iomap.length <= offset);
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return 0;
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}
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static int
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xfs_map_blocks(
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struct iomap_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);
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xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
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xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, offset + count);
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xfs_fileoff_t cow_fsb;
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int whichfork;
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struct xfs_bmbt_irec imap;
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struct xfs_iext_cursor icur;
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int retries = 0;
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int error = 0;
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if (XFS_FORCED_SHUTDOWN(mp))
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return -EIO;
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/*
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* COW fork blocks can overlap data fork blocks even if the blocks
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* aren't shared. COW I/O always takes precedent, so we must always
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* check for overlap on reflink inodes unless the mapping is already a
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* COW one, or the COW fork hasn't changed from the last time we looked
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* at it.
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*
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* It's safe to check the COW fork if_seq here without the ILOCK because
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* we've indirectly protected against concurrent updates: writeback has
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* the page locked, which prevents concurrent invalidations by reflink
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* and directio and prevents concurrent buffered writes to the same
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* page. Changes to if_seq always happen under i_lock, which protects
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* against concurrent updates and provides a memory barrier on the way
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* out that ensures that we always see the current value.
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*/
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if (xfs_imap_valid(wpc, ip, offset))
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return 0;
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/*
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* If we don't have a valid map, now it's time to get a new one for this
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* offset. This will convert delayed allocations (including COW ones)
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* into real extents. If we return without a valid map, it means we
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* landed in a hole and we skip the block.
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*/
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retry:
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cow_fsb = NULLFILEOFF;
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whichfork = XFS_DATA_FORK;
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xfs_ilock(ip, XFS_ILOCK_SHARED);
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ASSERT(!xfs_need_iread_extents(&ip->i_df));
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/*
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* Check if this is offset is covered by a COW extents, and if yes use
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* it directly instead of looking up anything in the data fork.
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*/
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if (xfs_inode_has_cow_data(ip) &&
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xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb, &icur, &imap))
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cow_fsb = imap.br_startoff;
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if (cow_fsb != NULLFILEOFF && cow_fsb <= offset_fsb) {
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XFS_WPC(wpc)->cow_seq = READ_ONCE(ip->i_cowfp->if_seq);
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xfs_iunlock(ip, XFS_ILOCK_SHARED);
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whichfork = XFS_COW_FORK;
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goto allocate_blocks;
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}
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/*
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* No COW extent overlap. Revalidate now that we may have updated
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* ->cow_seq. If the data mapping is still valid, we're done.
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*/
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if (xfs_imap_valid(wpc, ip, offset)) {
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xfs_iunlock(ip, XFS_ILOCK_SHARED);
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return 0;
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}
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/*
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* If we don't have a valid map, now it's time to get a new one for this
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* offset. This will convert delayed allocations (including COW ones)
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* into real extents.
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*/
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if (!xfs_iext_lookup_extent(ip, &ip->i_df, offset_fsb, &icur, &imap))
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imap.br_startoff = end_fsb; /* fake a hole past EOF */
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XFS_WPC(wpc)->data_seq = READ_ONCE(ip->i_df.if_seq);
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xfs_iunlock(ip, XFS_ILOCK_SHARED);
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/* landed in a hole or beyond EOF? */
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if (imap.br_startoff > offset_fsb) {
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imap.br_blockcount = imap.br_startoff - offset_fsb;
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imap.br_startoff = offset_fsb;
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imap.br_startblock = HOLESTARTBLOCK;
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imap.br_state = XFS_EXT_NORM;
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}
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/*
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* Truncate to the next COW extent if there is one. This is the only
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* opportunity to do this because we can skip COW fork lookups for the
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* subsequent blocks in the mapping; however, the requirement to treat
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* the COW range separately remains.
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*/
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if (cow_fsb != NULLFILEOFF &&
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cow_fsb < imap.br_startoff + imap.br_blockcount)
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imap.br_blockcount = cow_fsb - imap.br_startoff;
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/* got a delalloc extent? */
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if (imap.br_startblock != HOLESTARTBLOCK &&
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isnullstartblock(imap.br_startblock))
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goto allocate_blocks;
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xfs_bmbt_to_iomap(ip, &wpc->iomap, &imap, 0);
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trace_xfs_map_blocks_found(ip, offset, count, whichfork, &imap);
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return 0;
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allocate_blocks:
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error = xfs_convert_blocks(wpc, ip, whichfork, offset);
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if (error) {
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/*
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* If we failed to find the extent in the COW fork we might have
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* raced with a COW to data fork conversion or truncate.
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* Restart the lookup to catch the extent in the data fork for
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* the former case, but prevent additional retries to avoid
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* looping forever for the latter case.
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*/
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if (error == -EAGAIN && whichfork == XFS_COW_FORK && !retries++)
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goto retry;
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ASSERT(error != -EAGAIN);
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return error;
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}
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/*
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* Due to merging the return real extent might be larger than the
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* original delalloc one. Trim the return extent to the next COW
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* boundary again to force a re-lookup.
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*/
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if (whichfork != XFS_COW_FORK && cow_fsb != NULLFILEOFF) {
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loff_t cow_offset = XFS_FSB_TO_B(mp, cow_fsb);
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if (cow_offset < wpc->iomap.offset + wpc->iomap.length)
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wpc->iomap.length = cow_offset - wpc->iomap.offset;
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}
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ASSERT(wpc->iomap.offset <= offset);
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ASSERT(wpc->iomap.offset + wpc->iomap.length > offset);
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trace_xfs_map_blocks_alloc(ip, offset, count, whichfork, &imap);
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return 0;
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}
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static int
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xfs_prepare_ioend(
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struct iomap_ioend *ioend,
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int status)
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{
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unsigned int nofs_flag;
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|
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/*
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* We can allocate memory here while doing writeback on behalf of
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* memory reclaim. To avoid memory allocation deadlocks set the
|
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* task-wide nofs context for the following operations.
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*/
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nofs_flag = memalloc_nofs_save();
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/* Convert CoW extents to regular */
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if (!status && (ioend->io_flags & IOMAP_F_SHARED)) {
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status = xfs_reflink_convert_cow(XFS_I(ioend->io_inode),
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ioend->io_offset, ioend->io_size);
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}
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memalloc_nofs_restore(nofs_flag);
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/* send ioends that might require a transaction to the completion wq */
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if (xfs_ioend_is_append(ioend) || ioend->io_type == IOMAP_UNWRITTEN ||
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(ioend->io_flags & IOMAP_F_SHARED))
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ioend->io_bio->bi_end_io = xfs_end_bio;
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return status;
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}
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|
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/*
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* If the page has delalloc blocks on it, we need to punch them out before we
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* invalidate the page. If we don't, we leave a stale delalloc mapping on the
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* inode that can trip up a later direct I/O read operation on the same region.
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*
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* We prevent this by truncating away the delalloc regions on the page. Because
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* they are delalloc, we can do this without needing a transaction. Indeed - if
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* we get ENOSPC errors, we have to be able to do this truncation without a
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* transaction as there is no space left for block reservation (typically why we
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* see a ENOSPC in writeback).
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*/
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static void
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xfs_discard_page(
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struct page *page,
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loff_t fileoff)
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{
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struct inode *inode = page->mapping->host;
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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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unsigned int pageoff = offset_in_page(fileoff);
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xfs_fileoff_t start_fsb = XFS_B_TO_FSBT(mp, fileoff);
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xfs_fileoff_t pageoff_fsb = XFS_B_TO_FSBT(mp, pageoff);
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int error;
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if (XFS_FORCED_SHUTDOWN(mp))
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goto out_invalidate;
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xfs_alert_ratelimited(mp,
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"page discard on page "PTR_FMT", inode 0x%llx, offset %llu.",
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page, ip->i_ino, fileoff);
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error = xfs_bmap_punch_delalloc_range(ip, start_fsb,
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i_blocks_per_page(inode, page) - pageoff_fsb);
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if (error && !XFS_FORCED_SHUTDOWN(mp))
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xfs_alert(mp, "page discard unable to remove delalloc mapping.");
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out_invalidate:
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iomap_invalidatepage(page, pageoff, PAGE_SIZE - pageoff);
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}
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static const struct iomap_writeback_ops xfs_writeback_ops = {
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.map_blocks = xfs_map_blocks,
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.prepare_ioend = xfs_prepare_ioend,
|
|
.discard_page = xfs_discard_page,
|
|
};
|
|
|
|
STATIC int
|
|
xfs_vm_writepage(
|
|
struct page *page,
|
|
struct writeback_control *wbc)
|
|
{
|
|
struct xfs_writepage_ctx wpc = { };
|
|
|
|
if (WARN_ON_ONCE(current->journal_info)) {
|
|
redirty_page_for_writepage(wbc, page);
|
|
unlock_page(page);
|
|
return 0;
|
|
}
|
|
|
|
return iomap_writepage(page, wbc, &wpc.ctx, &xfs_writeback_ops);
|
|
}
|
|
|
|
STATIC int
|
|
xfs_vm_writepages(
|
|
struct address_space *mapping,
|
|
struct writeback_control *wbc)
|
|
{
|
|
struct xfs_writepage_ctx wpc = { };
|
|
|
|
/*
|
|
* Writing back data in a transaction context can result in recursive
|
|
* transactions. This is bad, so issue a warning and get out of here.
|
|
*/
|
|
if (WARN_ON_ONCE(current->journal_info))
|
|
return 0;
|
|
|
|
xfs_iflags_clear(XFS_I(mapping->host), XFS_ITRUNCATED);
|
|
return iomap_writepages(mapping, wbc, &wpc.ctx, &xfs_writeback_ops);
|
|
}
|
|
|
|
STATIC int
|
|
xfs_dax_writepages(
|
|
struct address_space *mapping,
|
|
struct writeback_control *wbc)
|
|
{
|
|
struct xfs_inode *ip = XFS_I(mapping->host);
|
|
|
|
xfs_iflags_clear(ip, XFS_ITRUNCATED);
|
|
return dax_writeback_mapping_range(mapping,
|
|
xfs_inode_buftarg(ip)->bt_daxdev, wbc);
|
|
}
|
|
|
|
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_read_iomap_ops);
|
|
}
|
|
|
|
STATIC int
|
|
xfs_vm_readpage(
|
|
struct file *unused,
|
|
struct page *page)
|
|
{
|
|
return iomap_readpage(page, &xfs_read_iomap_ops);
|
|
}
|
|
|
|
STATIC void
|
|
xfs_vm_readahead(
|
|
struct readahead_control *rac)
|
|
{
|
|
iomap_readahead(rac, &xfs_read_iomap_ops);
|
|
}
|
|
|
|
static int
|
|
xfs_iomap_swapfile_activate(
|
|
struct swap_info_struct *sis,
|
|
struct file *swap_file,
|
|
sector_t *span)
|
|
{
|
|
sis->bdev = xfs_inode_buftarg(XFS_I(file_inode(swap_file)))->bt_bdev;
|
|
return iomap_swapfile_activate(sis, swap_file, span,
|
|
&xfs_read_iomap_ops);
|
|
}
|
|
|
|
const struct address_space_operations xfs_address_space_operations = {
|
|
.readpage = xfs_vm_readpage,
|
|
.readahead = xfs_vm_readahead,
|
|
.writepage = xfs_vm_writepage,
|
|
.writepages = xfs_vm_writepages,
|
|
.set_page_dirty = iomap_set_page_dirty,
|
|
.releasepage = iomap_releasepage,
|
|
.invalidatepage = iomap_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,
|
|
};
|