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authorLinus Torvalds <torvalds@linux-foundation.org>2016-12-17 18:44:00 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-17 18:44:00 -0800
commit0110c350c86d511be2130cb2a30dcbb76c4af750 (patch)
treed343a9e0fcb586a7110b13d411b314d33d404c08 /fs/9p
parentd9cb5bfcc3339f1a63df8fe0af8cece33c83c3af (diff)
parent9763f7a4a5f7b1a7c480fa06d01b2bad25163c0a (diff)
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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull more vfs updates from Al Viro: "In this pile: - autofs-namespace series - dedupe stuff - more struct path constification" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (40 commits) ocfs2: implement the VFS clone_range, copy_range, and dedupe_range features ocfs2: charge quota for reflinked blocks ocfs2: fix bad pointer cast ocfs2: always unlock when completing dio writes ocfs2: don't eat io errors during _dio_end_io_write ocfs2: budget for extent tree splits when adding refcount flag ocfs2: prohibit refcounted swapfiles ocfs2: add newlines to some error messages ocfs2: convert inode refcount test to a helper simple_write_end(): don't zero in short copy into uptodate exofs: don't mess with simple_write_{begin,end} 9p: saner ->write_end() on failing copy into non-uptodate page fix gfs2_stuffed_write_end() on short copies fix ceph_write_end() nfs_write_end(): fix handling of short copies vfs: refactor clone/dedupe_file_range common functions fs: try to clone files first in vfs_copy_file_range vfs: misc struct path constification namespace.c: constify struct path passed to a bunch of primitives quota: constify struct path in quota_on ...
Diffstat (limited to 'fs/9p')
-rw-r--r--fs/9p/vfs_addr.c15
1 files changed, 4 insertions, 11 deletions
diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c
index 5ca1fb0043f6..adaf6f6dd858 100644
--- a/fs/9p/vfs_addr.c
+++ b/fs/9p/vfs_addr.c
@@ -310,18 +310,10 @@ static int v9fs_write_end(struct file *filp, struct address_space *mapping,
p9_debug(P9_DEBUG_VFS, "filp %p, mapping %p\n", filp, mapping);
- if (unlikely(copied < len)) {
- /*
- * zero out the rest of the area
- */
- unsigned from = pos & (PAGE_SIZE - 1);
-
- zero_user(page, from + copied, len - copied);
- flush_dcache_page(page);
+ if (unlikely(copied < len && !PageUptodate(page))) {
+ copied = 0;
+ goto out;
}
-
- if (!PageUptodate(page))
- SetPageUptodate(page);
/*
* No need to use i_size_read() here, the i_size
* cannot change under us because we hold the i_mutex.
@@ -331,6 +323,7 @@ static int v9fs_write_end(struct file *filp, struct address_space *mapping,
i_size_write(inode, last_pos);
}
set_page_dirty(page);
+out:
unlock_page(page);
put_page(page);