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authorM. Mohan Kumar <mohan@in.ibm.com>2013-02-05 12:55:05 +0400
committerEric Van Hensbergen <ericvh@gmail.com>2013-02-11 02:29:59 +0400
commitb6f4bee02f682d1c86ece297871b78ae01afaaf4 (patch)
treecebad2fa8b3fbc43a54f115b1f69491d5f8d67a5 /fs/9p
parent03f0e022736d123bc42907a958535f4f10d0c4c3 (diff)
downloadlinux-b6f4bee02f682d1c86ece297871b78ae01afaaf4.tar.xz
fs/9p: Fix atomic_open
Return EEXISTS if requested file already exists, without this patch open call will always succeed even if the file exists and user specified O_CREAT|O_EXCL. Following test code can be used to verify this patch. Without this patch executing following test code on 9p mount will result in printing 'test case failed' always. main() { int fd; /* first create the file */ fd = open("./file", O_CREAT|O_WRONLY); if (fd < 0) { perror("open"); return -1; } close(fd); /* Now opening same file with O_CREAT|O_EXCL should fail */ fd = open("./file", O_CREAT|O_EXCL); if (fd < 0 && errno == EEXIST) printf("test case pass\n"); else printf("test case failed\n"); close(fd); return 0; } Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'fs/9p')
-rw-r--r--fs/9p/vfs_inode_dotl.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index edd41d918e6c..8d24ad66dfb8 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -267,8 +267,14 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
}
/* Only creates */
- if (!(flags & O_CREAT) || dentry->d_inode)
- return finish_no_open(file, res);
+ if (!(flags & O_CREAT))
+ return finish_no_open(file, res);
+ else if (dentry->d_inode) {
+ if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
+ return -EEXIST;
+ else
+ return finish_no_open(file, res);
+ }
v9ses = v9fs_inode2v9ses(dir);