From: Christoph Hellwig <hch@lst.de>
To: "Darrick J . Wong" <darrick.wong@oracle.com>
Cc: Damien Le Moal <Damien.LeMoal@wdc.com>,
Andreas Gruenbacher <agruenba@redhat.com>,
linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org, Dave Chinner <dchinner@redhat.com>
Subject: [PATCH 08/14] iomap: zero newly allocated mapped blocks
Date: Thu, 17 Oct 2019 19:56:18 +0200 [thread overview]
Message-ID: <20191017175624.30305-9-hch@lst.de> (raw)
In-Reply-To: <20191017175624.30305-1-hch@lst.de>
File systems like gfs2 don't support delayed allocations or unwritten
extents and thus allocate normal mapped blocks to fill holes. To
cover the case of such file systems allocating new blocks to fill holes
also zero out mapped blocks with the new flag.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
---
fs/iomap/buffered-io.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index e25901ae3ff4..181ee8477aad 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -203,6 +203,14 @@ iomap_read_inline_data(struct inode *inode, struct page *page,
SetPageUptodate(page);
}
+static inline bool iomap_block_needs_zeroing(struct inode *inode,
+ struct iomap *iomap, loff_t pos)
+{
+ return iomap->type != IOMAP_MAPPED ||
+ (iomap->flags & IOMAP_F_NEW) ||
+ pos >= i_size_read(inode);
+}
+
static loff_t
iomap_readpage_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
struct iomap *iomap)
@@ -226,7 +234,7 @@ iomap_readpage_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
if (plen == 0)
goto done;
- if (iomap->type != IOMAP_MAPPED || pos >= i_size_read(inode)) {
+ if (iomap_block_needs_zeroing(inode, iomap, pos)) {
zero_user(page, poff, plen);
iomap_set_range_uptodate(page, poff, plen);
goto done;
@@ -532,7 +540,7 @@ iomap_read_page_sync(struct inode *inode, loff_t block_start, struct page *page,
struct bio_vec bvec;
struct bio bio;
- if (iomap->type != IOMAP_MAPPED || block_start >= i_size_read(inode)) {
+ if (iomap_block_needs_zeroing(inode, iomap, block_start)) {
zero_user_segments(page, poff, from, to, poff + plen);
iomap_set_range_uptodate(page, poff, plen);
return 0;
--
2.20.1
next prev parent reply other threads:[~2019-10-17 17:56 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-17 17:56 lift the xfs writepage code into iomap v8 Christoph Hellwig
2019-10-17 17:56 ` [PATCH 01/14] iomap: iomap that extends beyond EOF should be marked dirty Christoph Hellwig
2019-10-17 18:39 ` Darrick J. Wong
2019-10-17 21:56 ` Dave Chinner
2019-10-17 23:08 ` Matthew Bobrowski
2019-10-18 1:02 ` Darrick J. Wong
2019-10-18 7:20 ` Christoph Hellwig
2019-10-17 17:56 ` [PATCH 02/14] xfs: initialize iomap->flags in xfs_bmbt_to_iomap Christoph Hellwig
2019-10-17 17:56 ` [PATCH 03/14] xfs: set IOMAP_F_NEW more carefully Christoph Hellwig
2019-10-17 17:56 ` [PATCH 04/14] xfs: use a struct iomap in xfs_writepage_ctx Christoph Hellwig
2019-10-17 17:56 ` [PATCH 05/14] xfs: refactor the ioend merging code Christoph Hellwig
2019-10-17 18:40 ` Darrick J. Wong
2019-10-17 17:56 ` [PATCH 06/14] xfs: turn io_append_trans into an io_private void pointer Christoph Hellwig
2019-10-17 17:56 ` [PATCH 07/14] xfs: remove the fork fields in the writepage_ctx and ioend Christoph Hellwig
2019-10-17 17:56 ` Christoph Hellwig [this message]
2019-10-17 17:56 ` [PATCH 09/14] iomap: lift common tracing code from xfs to iomap Christoph Hellwig
2019-10-17 17:56 ` [PATCH 10/14] iomap: lift the xfs writeback code " Christoph Hellwig
2019-10-17 18:48 ` Darrick J. Wong
2019-10-17 22:01 ` Dave Chinner
2019-10-17 17:56 ` [PATCH 11/14] iomap: warn on inline maps in iomap_writepage_map Christoph Hellwig
2019-10-17 17:56 ` [PATCH 12/14] iomap: move struct iomap_page out of iomap.h Christoph Hellwig
2019-10-17 17:56 ` [PATCH 13/14] iomap: cleanup iomap_ioend_compare Christoph Hellwig
2019-10-17 17:56 ` [PATCH 14/14] iomap: pass a struct page to iomap_finish_page_writeback Christoph Hellwig
2019-10-17 18:41 ` Darrick J. Wong
2019-10-17 20:49 ` lift the xfs writepage code into iomap v8 Darrick J. Wong
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