From: Zhang Yi <yi.zhang@huaweicloud.com>
To: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, djwong@kernel.org,
hch@infradead.org, brauner@kernel.org, david@fromorbit.com,
tytso@mit.edu, jack@suse.cz, yi.zhang@huawei.com,
yi.zhang@huaweicloud.com, chengzhihao1@huawei.com,
yukuai3@huawei.com
Subject: [PATCH v4 6/9] iomap: don't increase i_size if it's not a write operation
Date: Wed, 20 Mar 2024 19:05:45 +0800 [thread overview]
Message-ID: <20240320110548.2200662-7-yi.zhang@huaweicloud.com> (raw)
In-Reply-To: <20240320110548.2200662-1-yi.zhang@huaweicloud.com>
From: Zhang Yi <yi.zhang@huawei.com>
Increase i_size in iomap_zero_range() and iomap_unshare_iter() is not
needed, the caller should handle it. Especially, when truncate partial
block, we should not increase i_size beyond the new EOF here. It doesn't
affect xfs and gfs2 now because they set the new file size after zero
out, it doesn't matter that a transient increase in i_size, but it will
affect ext4 because it set file size before truncate. So move the i_size
updating logic to iomap_write_iter().
Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
---
fs/iomap/buffered-io.c | 50 +++++++++++++++++++++---------------------
1 file changed, 25 insertions(+), 25 deletions(-)
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 7e32a204650b..e9112dc78d15 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -837,32 +837,13 @@ static size_t iomap_write_end(struct iomap_iter *iter, loff_t pos, size_t len,
size_t copied, struct folio *folio)
{
const struct iomap *srcmap = iomap_iter_srcmap(iter);
- loff_t old_size = iter->inode->i_size;
- size_t ret;
-
- if (srcmap->type == IOMAP_INLINE) {
- ret = iomap_write_end_inline(iter, folio, pos, copied);
- } else if (srcmap->flags & IOMAP_F_BUFFER_HEAD) {
- ret = block_write_end(NULL, iter->inode->i_mapping, pos, len,
- copied, &folio->page, NULL);
- } else {
- ret = __iomap_write_end(iter->inode, pos, len, copied, folio);
- }
-
- /*
- * Update the in-memory inode size after copying the data into the page
- * cache. It's up to the file system to write the updated size to disk,
- * preferably after I/O completion so that no stale data is exposed.
- */
- if (pos + ret > old_size) {
- i_size_write(iter->inode, pos + ret);
- iter->iomap.flags |= IOMAP_F_SIZE_CHANGED;
- }
- __iomap_put_folio(iter, pos, ret, folio);
- if (old_size < pos)
- pagecache_isize_extended(iter->inode, old_size, pos);
- return ret;
+ if (srcmap->type == IOMAP_INLINE)
+ return iomap_write_end_inline(iter, folio, pos, copied);
+ if (srcmap->flags & IOMAP_F_BUFFER_HEAD)
+ return block_write_end(NULL, iter->inode->i_mapping, pos, len,
+ copied, &folio->page, NULL);
+ return __iomap_write_end(iter->inode, pos, len, copied, folio);
}
static loff_t iomap_write_iter(struct iomap_iter *iter, struct iov_iter *i)
@@ -877,6 +858,7 @@ static loff_t iomap_write_iter(struct iomap_iter *iter, struct iov_iter *i)
do {
struct folio *folio;
+ loff_t old_size;
size_t offset; /* Offset into folio */
size_t bytes; /* Bytes to write to folio */
size_t copied; /* Bytes copied from user */
@@ -926,6 +908,22 @@ static loff_t iomap_write_iter(struct iomap_iter *iter, struct iov_iter *i)
copied = copy_folio_from_iter_atomic(folio, offset, bytes, i);
status = iomap_write_end(iter, pos, bytes, copied, folio);
+ /*
+ * Update the in-memory inode size after copying the data into
+ * the page cache. It's up to the file system to write the
+ * updated size to disk, preferably after I/O completion so that
+ * no stale data is exposed. Only once that's done can we
+ * unlock and release the folio.
+ */
+ old_size = iter->inode->i_size;
+ if (pos + status > old_size) {
+ i_size_write(iter->inode, pos + status);
+ iter->iomap.flags |= IOMAP_F_SIZE_CHANGED;
+ }
+ __iomap_put_folio(iter, pos, status, folio);
+
+ if (old_size < pos)
+ pagecache_isize_extended(iter->inode, old_size, pos);
if (status < bytes)
iomap_write_failed(iter->inode, pos + status,
bytes - status);
@@ -1298,6 +1296,7 @@ static loff_t iomap_unshare_iter(struct iomap_iter *iter)
bytes = folio_size(folio) - offset;
bytes = iomap_write_end(iter, pos, bytes, bytes, folio);
+ __iomap_put_folio(iter, pos, bytes, folio);
if (WARN_ON_ONCE(bytes == 0))
return -EIO;
@@ -1362,6 +1361,7 @@ static loff_t iomap_zero_iter(struct iomap_iter *iter, bool *did_zero)
folio_mark_accessed(folio);
bytes = iomap_write_end(iter, pos, bytes, bytes, folio);
+ __iomap_put_folio(iter, pos, bytes, folio);
if (WARN_ON_ONCE(bytes == 0))
return -EIO;
--
2.39.2
next prev parent reply other threads:[~2024-03-20 11:13 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-20 11:05 [PATCH v4 0/9] xfs/iomap: fix non-atomic clone operation and don't update size when zeroing range post eof Zhang Yi
2024-03-20 11:05 ` [PATCH v4 1/9] xfs: match lock mode in xfs_buffered_write_iomap_begin() Zhang Yi
2024-03-20 11:05 ` [PATCH v4 2/9] xfs: make the seq argument to xfs_bmapi_convert_delalloc() optional Zhang Yi
2024-03-20 11:05 ` [PATCH v4 3/9] xfs: make xfs_bmapi_convert_delalloc() to allocate the target offset Zhang Yi
2024-03-20 11:05 ` [PATCH v4 4/9] xfs: convert delayed extents to unwritten when zeroing post eof blocks Zhang Yi
2024-04-23 11:17 ` [PATCH v5 " Zhang Yi
2024-04-25 12:22 ` Christoph Hellwig
2024-04-25 12:32 ` Zhang Yi
2024-03-20 11:05 ` [PATCH v4 5/9] iomap: drop the write failure handles when unsharing and zeroing Zhang Yi
2024-03-20 11:05 ` Zhang Yi [this message]
2024-04-19 6:07 ` [PATCH v4 6/9] iomap: don't increase i_size if it's not a write operation Chandan Babu R
2024-04-19 8:14 ` Zhang Yi
2024-04-23 11:30 ` Zhang Yi
2024-03-20 11:05 ` [PATCH v4 7/9] iomap: use a new variable to handle the written bytes in iomap_write_iter() Zhang Yi
2024-03-20 11:05 ` [PATCH v4 8/9] iomap: make iomap_write_end() return a boolean Zhang Yi
2024-03-20 11:05 ` [PATCH v4 9/9] iomap: do some small logical cleanup in buffered write Zhang Yi
2024-04-17 4:42 ` [PATCH v4 0/9] xfs/iomap: fix non-atomic clone operation and don't update size when zeroing range post eof Chandan Babu R
2024-04-17 11:40 ` Christian Brauner
2024-04-18 9:30 ` Chandan Babu R
2024-04-25 12:25 ` (subset) " Christian Brauner
2024-04-29 11:48 ` Chandan Babu R
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