From 760fea8bfb7f6095df3c4d37987b86b818f78c88 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Thu, 17 Oct 2019 13:12:10 -0700 Subject: [PATCH] xfs: remove the fork fields in the writepage_ctx and ioend In preparation for moving the writeback code to iomap.c, replace the XFS-specific COW fork concept with the iomap IOMAP_F_SHARED flag. Signed-off-by: Christoph Hellwig Reviewed-by: Dave Chinner Reviewed-by: Darrick J. Wong Signed-off-by: Darrick J. Wong --- fs/xfs/xfs_aops.c | 71 ++++++++++++++++++++++++++++++----------------- fs/xfs/xfs_aops.h | 2 +- 2 files changed, 46 insertions(+), 27 deletions(-) diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index df5955388adc..00fe40b35f72 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -23,7 +23,6 @@ */ struct xfs_writepage_ctx { struct iomap iomap; - int fork; unsigned int data_seq; unsigned int cow_seq; struct xfs_ioend *ioend; @@ -272,7 +271,7 @@ xfs_end_ioend( */ error = blk_status_to_errno(ioend->io_bio->bi_status); if (unlikely(error)) { - if (ioend->io_fork == XFS_COW_FORK) + if (ioend->io_flags & IOMAP_F_SHARED) xfs_reflink_cancel_cow_range(ip, offset, size, true); goto done; } @@ -280,7 +279,7 @@ xfs_end_ioend( /* * Success: commit the COW or unwritten blocks if needed. */ - if (ioend->io_fork == XFS_COW_FORK) + if (ioend->io_flags & IOMAP_F_SHARED) error = xfs_reflink_end_cow(ip, offset, size); else if (ioend->io_type == IOMAP_UNWRITTEN) error = xfs_iomap_write_unwritten(ip, offset, size, false); @@ -304,7 +303,8 @@ xfs_ioend_can_merge( { if (ioend->io_bio->bi_status != next->io_bio->bi_status) return false; - if ((ioend->io_fork == XFS_COW_FORK) ^ (next->io_fork == XFS_COW_FORK)) + if ((ioend->io_flags & IOMAP_F_SHARED) ^ + (next->io_flags & IOMAP_F_SHARED)) return false; if ((ioend->io_type == IOMAP_UNWRITTEN) ^ (next->io_type == IOMAP_UNWRITTEN)) @@ -404,6 +404,13 @@ xfs_end_io( } } +static inline bool xfs_ioend_needs_workqueue(struct xfs_ioend *ioend) +{ + return ioend->io_private || + ioend->io_type == IOMAP_UNWRITTEN || + (ioend->io_flags & IOMAP_F_SHARED); +} + STATIC void xfs_end_bio( struct bio *bio) @@ -413,9 +420,7 @@ xfs_end_bio( struct xfs_mount *mp = ip->i_mount; unsigned long flags; - if (ioend->io_fork == XFS_COW_FORK || - ioend->io_type == IOMAP_UNWRITTEN || - ioend->io_private) { + if (xfs_ioend_needs_workqueue(ioend)) { spin_lock_irqsave(&ip->i_ioend_lock, flags); if (list_empty(&ip->i_ioend_list)) WARN_ON_ONCE(!queue_work(mp->m_unwritten_workqueue, @@ -444,7 +449,7 @@ xfs_imap_valid( * covers the offset. Be careful to check this first because the caller * can revalidate a COW mapping without updating the data seqno. */ - if (wpc->fork == XFS_COW_FORK) + if (wpc->iomap.flags & IOMAP_F_SHARED) return true; /* @@ -474,6 +479,7 @@ static int xfs_convert_blocks( struct xfs_writepage_ctx *wpc, struct xfs_inode *ip, + int whichfork, loff_t offset) { int error; @@ -485,8 +491,8 @@ xfs_convert_blocks( * delalloc extent if free space is sufficiently fragmented. */ do { - error = xfs_bmapi_convert_delalloc(ip, wpc->fork, offset, - &wpc->iomap, wpc->fork == XFS_COW_FORK ? + error = xfs_bmapi_convert_delalloc(ip, whichfork, offset, + &wpc->iomap, whichfork == XFS_COW_FORK ? &wpc->cow_seq : &wpc->data_seq); if (error) return error; @@ -507,6 +513,7 @@ xfs_map_blocks( xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset); xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, offset + count); xfs_fileoff_t cow_fsb = NULLFILEOFF; + int whichfork = XFS_DATA_FORK; struct xfs_bmbt_irec imap; struct xfs_iext_cursor icur; int retries = 0; @@ -555,7 +562,7 @@ retry: wpc->cow_seq = READ_ONCE(ip->i_cowfp->if_seq); xfs_iunlock(ip, XFS_ILOCK_SHARED); - wpc->fork = XFS_COW_FORK; + whichfork = XFS_COW_FORK; goto allocate_blocks; } @@ -578,8 +585,6 @@ retry: wpc->data_seq = READ_ONCE(ip->i_df.if_seq); xfs_iunlock(ip, XFS_ILOCK_SHARED); - wpc->fork = XFS_DATA_FORK; - /* landed in a hole or beyond EOF? */ if (imap.br_startoff > offset_fsb) { imap.br_blockcount = imap.br_startoff - offset_fsb; @@ -604,10 +609,10 @@ retry: goto allocate_blocks; xfs_bmbt_to_iomap(ip, &wpc->iomap, &imap, 0); - trace_xfs_map_blocks_found(ip, offset, count, wpc->fork, &imap); + trace_xfs_map_blocks_found(ip, offset, count, whichfork, &imap); return 0; allocate_blocks: - error = xfs_convert_blocks(wpc, ip, offset); + error = xfs_convert_blocks(wpc, ip, whichfork, offset); if (error) { /* * If we failed to find the extent in the COW fork we might have @@ -616,7 +621,7 @@ allocate_blocks: * the former case, but prevent additional retries to avoid * looping forever for the latter case. */ - if (error == -EAGAIN && wpc->fork == XFS_COW_FORK && !retries++) + if (error == -EAGAIN && whichfork == XFS_COW_FORK && !retries++) goto retry; ASSERT(error != -EAGAIN); return error; @@ -627,7 +632,7 @@ allocate_blocks: * original delalloc one. Trim the return extent to the next COW * boundary again to force a re-lookup. */ - if (wpc->fork != XFS_COW_FORK && cow_fsb != NULLFILEOFF) { + if (whichfork != XFS_COW_FORK && cow_fsb != NULLFILEOFF) { loff_t cow_offset = XFS_FSB_TO_B(mp, cow_fsb); if (cow_offset < wpc->iomap.offset + wpc->iomap.length) @@ -636,7 +641,7 @@ allocate_blocks: ASSERT(wpc->iomap.offset <= offset); ASSERT(wpc->iomap.offset + wpc->iomap.length > offset); - trace_xfs_map_blocks_alloc(ip, offset, count, wpc->fork, &imap); + trace_xfs_map_blocks_alloc(ip, offset, count, whichfork, &imap); return 0; } @@ -670,14 +675,14 @@ xfs_submit_ioend( nofs_flag = memalloc_nofs_save(); /* Convert CoW extents to regular */ - if (!status && ioend->io_fork == XFS_COW_FORK) { + if (!status && (ioend->io_flags & IOMAP_F_SHARED)) { status = xfs_reflink_convert_cow(XFS_I(ioend->io_inode), ioend->io_offset, ioend->io_size); } /* Reserve log space if we might write beyond the on-disk inode size. */ if (!status && - (ioend->io_fork == XFS_COW_FORK || + ((ioend->io_flags & IOMAP_F_SHARED) || ioend->io_type != IOMAP_UNWRITTEN) && xfs_ioend_is_append(ioend) && !ioend->io_private) @@ -724,8 +729,8 @@ xfs_alloc_ioend( ioend = container_of(bio, struct xfs_ioend, io_inline_bio); INIT_LIST_HEAD(&ioend->io_list); - ioend->io_fork = wpc->fork; ioend->io_type = wpc->iomap.type; + ioend->io_flags = wpc->iomap.flags; ioend->io_inode = inode; ioend->io_size = 0; ioend->io_offset = offset; @@ -759,6 +764,24 @@ xfs_chain_bio( return new; } +static bool +xfs_can_add_to_ioend( + struct xfs_writepage_ctx *wpc, + xfs_off_t offset, + sector_t sector) +{ + if ((wpc->iomap.flags & IOMAP_F_SHARED) != + (wpc->ioend->io_flags & IOMAP_F_SHARED)) + return false; + if (wpc->iomap.type != wpc->ioend->io_type) + return false; + if (offset != wpc->ioend->io_offset + wpc->ioend->io_size) + return false; + if (sector != bio_end_sector(wpc->ioend->io_bio)) + return false; + return true; +} + /* * Test to see if we have an existing ioend structure that we could append to * first, otherwise finish off the current ioend and start another. @@ -778,11 +801,7 @@ xfs_add_to_ioend( unsigned poff = offset & (PAGE_SIZE - 1); bool merged, same_page = false; - if (!wpc->ioend || - wpc->fork != wpc->ioend->io_fork || - wpc->iomap.type != wpc->ioend->io_type || - sector != bio_end_sector(wpc->ioend->io_bio) || - offset != wpc->ioend->io_offset + wpc->ioend->io_size) { + if (!wpc->ioend || !xfs_can_add_to_ioend(wpc, offset, sector)) { if (wpc->ioend) list_add(&wpc->ioend->io_list, iolist); wpc->ioend = xfs_alloc_ioend(inode, wpc, offset, sector, wbc); diff --git a/fs/xfs/xfs_aops.h b/fs/xfs/xfs_aops.h index 6a45d675dcba..4a0226cdad4f 100644 --- a/fs/xfs/xfs_aops.h +++ b/fs/xfs/xfs_aops.h @@ -13,8 +13,8 @@ extern struct bio_set xfs_ioend_bioset; */ struct xfs_ioend { struct list_head io_list; /* next ioend in chain */ - int io_fork; /* inode fork written back */ u16 io_type; + u16 io_flags; /* IOMAP_F_* */ struct inode *io_inode; /* file being written to */ size_t io_size; /* size of the extent */ xfs_off_t io_offset; /* offset in the file */ -- 2.25.1