blob: c3844a3ece42ed2149b4e0fd35bf703c589a3045 [file] [log] [blame]
From 594daf17075204fb3adbe720b77e60a00e8da5d2 Mon Sep 17 00:00:00 2001
From: Andreas Gruenbacher <agruenba@redhat.com>
Date: Thu, 27 Jun 2019 17:28:40 -0700
Subject: [PATCH] iomap: don't mark the inode dirty in iomap_write_end
commit 8d3e72a180b42c01ec00045e1bb8eb91175adafe upstream.
Marking the inode dirty for each page copied into the page cache can be
very inefficient for file systems that use the VFS dirty inode tracking,
and is completely pointless for those that don't use the VFS dirty inode
tracking. So instead, only set an iomap flag when changing the in-core
inode size, and open code the rest of __generic_write_end.
Partially based on code from Christoph Hellwig.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 29cc55193ce5..c06d75d1fb41 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -1222,6 +1222,8 @@ static int gfs2_iomap_end(struct inode *inode, loff_t pos, loff_t length,
if (ip->i_qadata && ip->i_qadata->qa_qd_num)
gfs2_quota_unlock(ip);
+ if (iomap->flags & IOMAP_F_SIZE_CHANGED)
+ mark_inode_dirty(inode);
gfs2_write_unlock(inode);
out:
diff --git a/fs/iomap.c b/fs/iomap.c
index 52d4f972ee5a..a486202b198f 100644
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -777,6 +777,7 @@ iomap_write_end(struct inode *inode, loff_t pos, unsigned len,
unsigned copied, struct page *page, struct iomap *iomap)
{
const struct iomap_page_ops *page_ops = iomap->page_ops;
+ loff_t old_size = inode->i_size;
int ret;
if (iomap->type == IOMAP_INLINE) {
@@ -788,7 +789,19 @@ iomap_write_end(struct inode *inode, loff_t pos, unsigned len,
ret = __iomap_write_end(inode, pos, len, copied, page, iomap);
}
- __generic_write_end(inode, pos, ret, page);
+ /*
+ * 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(inode, pos + ret);
+ iomap->flags |= IOMAP_F_SIZE_CHANGED;
+ }
+ unlock_page(page);
+
+ if (old_size < pos)
+ pagecache_isize_extended(inode, old_size, pos);
if (page_ops && page_ops->page_done)
page_ops->page_done(inode, pos, copied, page, iomap);
put_page(page);
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index 2103b94cb1bf..1df9ea187a9a 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -35,6 +35,7 @@ struct vm_fault;
#define IOMAP_F_NEW 0x01 /* blocks have been newly allocated */
#define IOMAP_F_DIRTY 0x02 /* uncommitted metadata */
#define IOMAP_F_BUFFER_HEAD 0x04 /* file system requires buffer heads */
+#define IOMAP_F_SIZE_CHANGED 0x08 /* file size has changed */
/*
* Flags that only need to be reported for IOMAP_REPORT requests:
--
2.27.0