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vfs: do_last(): separate O_CREAT specific code 

Check O_CREAT on the slow lookup paths where necessary.  This allows the rest to
be shared with plain open.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Miklos Szeredi 2012-06-05 15:10:13 +02:00 committed by Al Viro
parent 37d7fffc9c
commit b6183df7b2
1 changed files with 17 additions and 16 deletions
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33
fs/namei.c
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@ -2274,23 +2274,24 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
inode = path->dentry->d_inode;
}
goto finish_lookup;
} else {
/* create side of things */
/*
* This will *only* deal with leaving RCU mode - LOOKUP_JUMPED
* has been cleared when we got to the last component we are
* about to look up
*/
error = complete_walk(nd);
if (error)
return ERR_PTR(error);
audit_inode(pathname, dir);
error = -EISDIR;
/* trailing slashes? */
if (nd->last.name[nd->last.len])
goto exit;
}
/* create side of things */
/*
* This will *only* deal with leaving RCU mode - LOOKUP_JUMPED has been
* cleared when we got to the last component we are about to look up
*/
error = complete_walk(nd);
if (error)
return ERR_PTR(error);
audit_inode(pathname, dir);
error = -EISDIR;
/* trailing slashes? */
if (nd->last.name[nd->last.len])
goto exit;
retry_lookup:
mutex_lock(&dir->d_inode->i_mutex);
@ -2305,7 +2306,7 @@ retry_lookup:
path->mnt = nd->path.mnt;
/* Negative dentry, just create the file */
if (!dentry->d_inode) {
if (!dentry->d_inode && (open_flag & O_CREAT)) {
umode_t mode = op->mode;
if (!IS_POSIXACL(dir->d_inode))
mode &= ~current_umask();