From: Christoph Hellwig <hch@lst.de>
To: linux-xfs@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org
Subject: [PATCH 17/24] xfs: remove the imap_valid flag
Date: Fri, 15 Jun 2018 15:02:02 +0200 [thread overview]
Message-ID: <20180615130209.1970-18-hch@lst.de> (raw)
In-Reply-To: <20180615130209.1970-1-hch@lst.de>
Simplify the way we check for a valid imap - we know we have a valid
mapping after xfs_map_blocks returned successfully, and we know we can
call xfs_imap_valid on any imap, as it will always fail on a
zero-initialized map.
We can also remove the xfs_imap_valid function and fold it into
xfs_map_blocks now.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
---
fs/xfs/xfs_aops.c | 75 ++++++++++++++++++++---------------------------
1 file changed, 32 insertions(+), 43 deletions(-)
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 25239bc189d4..7da3fe49b4de 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -42,7 +42,6 @@
*/
struct xfs_writepage_ctx {
struct xfs_bmbt_irec imap;
- bool imap_valid;
unsigned int io_type;
struct xfs_ioend *ioend;
sector_t last_block;
@@ -382,15 +381,41 @@ xfs_map_blocks(
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
ssize_t count = i_blocksize(inode);
- xfs_fileoff_t offset_fsb, end_fsb;
+ xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset), end_fsb;
struct xfs_bmbt_irec imap;
int whichfork = XFS_DATA_FORK;
struct xfs_iext_cursor icur;
+ bool imap_valid;
int error = 0;
+ /*
+ * We have to make sure the cached mapping is within EOF to protect
+ * against eofblocks trimming on file release leaving us with a stale
+ * mapping. Otherwise, a page for a subsequent file extending buffered
+ * write could get picked up by this writeback cycle and written to the
+ * wrong blocks.
+ *
+ * Note that what we really want here is a generic mapping invalidation
+ * mechanism to protect us from arbitrary extent modifying contexts, not
+ * just eofblocks.
+ */
+ xfs_trim_extent_eof(&wpc->imap, ip);
+
+ imap_valid = offset_fsb >= wpc->imap.br_startoff &&
+ offset_fsb < wpc->imap.br_startoff + wpc->imap.br_blockcount;
+ if (imap_valid &&
+ (!xfs_is_reflink_inode(ip) || wpc->io_type == XFS_IO_COW))
+ return 0;
+
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
+ /*
+ * If we don't have a valid map, now it's time to get a new one for this
+ * offset. This will convert delayed allocations (including COW ones)
+ * into real extents. If we return without a valid map, it means we
+ * landed in a hole and we skip the block.
+ */
xfs_ilock(ip, XFS_ILOCK_SHARED);
ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
(ip->i_df.if_flags & XFS_IFEXTENTS));
@@ -399,7 +424,6 @@ xfs_map_blocks(
if (offset > mp->m_super->s_maxbytes - count)
count = mp->m_super->s_maxbytes - offset;
end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
- offset_fsb = XFS_B_TO_FSBT(mp, offset);
/*
* Check if this is offset is covered by a COW extents, and if yes use
@@ -432,7 +456,7 @@ xfs_map_blocks(
/*
* Map valid and no COW extent in the way? We're done.
*/
- if (wpc->imap_valid) {
+ if (imap_valid) {
xfs_iunlock(ip, XFS_ILOCK_SHARED);
return 0;
}
@@ -477,31 +501,6 @@ xfs_map_blocks(
return 0;
}
-STATIC bool
-xfs_imap_valid(
- struct inode *inode,
- struct xfs_bmbt_irec *imap,
- xfs_off_t offset)
-{
- offset >>= inode->i_blkbits;
-
- /*
- * We have to make sure the cached mapping is within EOF to protect
- * against eofblocks trimming on file release leaving us with a stale
- * mapping. Otherwise, a page for a subsequent file extending buffered
- * write could get picked up by this writeback cycle and written to the
- * wrong blocks.
- *
- * Note that what we really want here is a generic mapping invalidation
- * mechanism to protect us from arbitrary extent modifying contexts, not
- * just eofblocks.
- */
- xfs_trim_extent_eof(imap, XFS_I(inode));
-
- return offset >= imap->br_startoff &&
- offset < imap->br_startoff + imap->br_blockcount;
-}
-
STATIC void
xfs_start_buffer_writeback(
struct buffer_head *bh)
@@ -858,20 +857,11 @@ xfs_writepage_map(
continue;
}
- if (wpc->imap_valid)
- wpc->imap_valid = xfs_imap_valid(inode, &wpc->imap,
- file_offset);
- if (!wpc->imap_valid ||
- (xfs_is_reflink_inode(XFS_I(inode)) &&
- wpc->io_type != XFS_IO_COW)) {
- error = xfs_map_blocks(wpc, inode, file_offset);
- if (error)
- goto out;
- wpc->imap_valid = xfs_imap_valid(inode, &wpc->imap,
- file_offset);
- }
+ error = xfs_map_blocks(wpc, inode, file_offset);
+ if (error)
+ goto out;
- if (!wpc->imap_valid || wpc->io_type == XFS_IO_HOLE)
+ if (wpc->io_type == XFS_IO_HOLE)
continue;
lock_buffer(bh);
@@ -881,7 +871,6 @@ xfs_writepage_map(
}
ASSERT(wpc->ioend || list_empty(&submit_list));
-
out:
/*
* On error, we have to fail the ioend here because we have locked
--
2.17.1
next prev parent reply other threads:[~2018-06-15 13:03 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-15 13:01 stop using buffer heads in xfs v6 Christoph Hellwig
2018-06-15 13:01 ` [PATCH 01/24] iomap: add an iomap-based readpage and readpages implementation Christoph Hellwig
2018-06-29 14:44 ` [PATCH] iomap: Add inline data support to iomap_readpage_actor Andreas Gruenbacher
2018-07-01 6:21 ` Christoph Hellwig
2018-07-01 21:43 ` Andreas Gruenbacher
2018-07-02 12:52 ` Christoph Hellwig
2018-07-02 15:05 ` Andreas Gruenbacher
2018-06-15 13:01 ` [PATCH 02/24] xfs: use iomap for blocksize == PAGE_SIZE readpage and readpages Christoph Hellwig
2018-06-15 13:01 ` [PATCH 03/24] iomap: add initial support for writes without buffer heads Christoph Hellwig
2018-06-15 13:01 ` [PATCH 04/24] xfs: simplify xfs_bmap_punch_delalloc_range Christoph Hellwig
2018-06-15 13:01 ` [PATCH 05/24] xfs: simplify xfs_aops_discard_page Christoph Hellwig
2018-06-15 13:01 ` [PATCH 06/24] xfs: move locking into xfs_bmap_punch_delalloc_range Christoph Hellwig
2018-06-19 5:26 ` Darrick J. Wong
2018-06-15 13:01 ` [PATCH 07/24] xfs: do not set the page uptodate in xfs_writepage_map Christoph Hellwig
2018-06-15 13:01 ` [PATCH 08/24] xfs: don't clear imap_valid for a non-uptodate buffers Christoph Hellwig
2018-06-15 13:01 ` [PATCH 09/24] xfs: don't use XFS_BMAPI_IGSTATE in xfs_map_blocks Christoph Hellwig
2018-06-19 5:27 ` Darrick J. Wong
2018-06-15 13:01 ` [PATCH 10/24] xfs: remove xfs_reflink_trim_irec_to_next_cow Christoph Hellwig
2018-06-19 5:30 ` Darrick J. Wong
2018-06-15 13:01 ` [PATCH 11/24] xfs: remove xfs_map_cow Christoph Hellwig
2018-06-18 17:38 ` Brian Foster
2018-06-19 5:35 ` Darrick J. Wong
2018-06-19 16:53 ` Christoph Hellwig
2018-06-20 0:37 ` Darrick J. Wong
2018-06-15 13:01 ` [PATCH 12/24] xfs: rename the offset variable in xfs_writepage_map Christoph Hellwig
2018-06-19 5:37 ` Darrick J. Wong
2018-06-15 13:01 ` [PATCH 13/24] xfs: make xfs_writepage_map extent map centric Christoph Hellwig
2018-06-18 17:38 ` Brian Foster
2018-06-19 5:43 ` Darrick J. Wong
2018-06-19 16:52 ` Christoph Hellwig
2018-06-15 13:01 ` [PATCH 14/24] xfs: remove the now unused XFS_BMAPI_IGSTATE flag Christoph Hellwig
2018-06-15 13:02 ` [PATCH 15/24] xfs: remove xfs_reflink_find_cow_mapping Christoph Hellwig
2018-06-15 13:02 ` [PATCH 16/24] xfs: simplify xfs_map_blocks by using xfs_iext_lookup_extent directly Christoph Hellwig
2018-06-15 13:02 ` Christoph Hellwig [this message]
2018-06-15 13:02 ` [PATCH 18/24] xfs: don't look at buffer heads in xfs_add_to_ioend Christoph Hellwig
2018-06-15 13:02 ` [PATCH 19/24] xfs: move all writeback buffer_head manipulation into xfs_map_at_offset Christoph Hellwig
2018-06-15 13:02 ` [PATCH 20/24] xfs: remove xfs_start_page_writeback Christoph Hellwig
2018-06-15 13:02 ` [PATCH 21/24] xfs: refactor the tail of xfs_writepage_map Christoph Hellwig
2018-06-15 13:02 ` [PATCH 22/24] xfs: allow writeback on pages without buffer heads Christoph Hellwig
2018-06-15 13:02 ` [PATCH 23/24] iomap: add support for sub-pagesize buffered I/O " Christoph Hellwig
2018-06-19 16:52 ` Brian Foster
2018-06-20 7:56 ` Christoph Hellwig
2018-06-20 14:32 ` Brian Foster
2018-06-20 16:08 ` Darrick J. Wong
2018-06-20 18:12 ` Brian Foster
2018-06-20 19:02 ` Darrick J. Wong
2018-06-21 8:46 ` Christoph Hellwig
2018-06-23 13:06 ` Brian Foster
2018-06-29 15:59 ` Christoph Hellwig
2018-07-02 12:50 ` Christoph Hellwig
2018-07-02 18:16 ` Brian Foster
2018-06-21 7:53 ` Christoph Hellwig
2018-06-15 13:02 ` [PATCH 24/24] xfs: add support for sub-pagesize writeback without buffer_heads Christoph Hellwig
2018-06-19 6:15 ` Darrick J. Wong
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