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fix O_EXCL handling for devices 

O_EXCL without O_CREAT has different semantics; it's "fail if already opened",
not "fail if already exists".  commit 71574865 broke that...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-07-30 11:50:30 +04:00
parent bf8848918d
commit f8310c5920
1 changed files with 2 additions and 2 deletions
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4
fs/namei.c
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@ -2418,7 +2418,7 @@ static int atomic_open(struct nameidata *nd, struct dentry *dentry,
if ((open_flag & O_CREAT) && !IS_POSIXACL(dir))
mode &= ~current_umask();
if (open_flag & O_EXCL) {
if ((open_flag & (O_EXCL | O_CREAT)) == (O_EXCL | O_CREAT)) {
open_flag &= ~O_TRUNC;
*opened |= FILE_CREATED;
}
@ -2742,7 +2742,7 @@ retry_lookup:
}
error = -EEXIST;
if (open_flag & O_EXCL)
if ((open_flag & (O_EXCL | O_CREAT)) == (O_EXCL | O_CREAT))
goto exit_dput;
error = follow_managed(path, nd->flags);