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atomic_open(): lift the call of may_open() into do_last() 

there we'll be able to merge it with its counterparts in other
cases, and there's no reason to do it before the parent has
been unlocked

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-01-26 10:02:29 -05:00
parent 6fb968cdf9
commit 7be219b4dc
1 changed files with 11 additions and 15 deletions
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26
fs/namei.c
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@ -2949,23 +2949,12 @@ static struct dentry *atomic_open(struct nameidata *nd, struct dentry *dentry,
d_lookup_done(dentry);
if (!error) {
if (file->f_mode & FMODE_OPENED) {
int acc_mode = op->acc_mode;
if (unlikely(dentry != file->f_path.dentry)) {
dput(dentry);
dentry = dget(file->f_path.dentry);
}
/*
* We didn't have the inode before the open, so check open
* permission here.
*/
if (file->f_mode & FMODE_CREATED) {
WARN_ON(!(open_flag & O_CREAT));
if (file->f_mode & FMODE_CREATED)
fsnotify_create(dir, dentry);
acc_mode = 0;
}
error = may_open(&file->f_path, acc_mode, open_flag);
if (WARN_ON(error > 0))
error = -EINVAL;
} else if (WARN_ON(file->f_path.dentry == DENTRY_NOT_SET)) {
error = -EIO;
} else {
@ -3208,12 +3197,19 @@ static const char *do_last(struct nameidata *nd,
}
if (file->f_mode & FMODE_OPENED) {
if ((file->f_mode & FMODE_CREATED) ||
!S_ISREG(file_inode(file)->i_mode))
if (file->f_mode & FMODE_CREATED) {
open_flag &= ~O_TRUNC;
will_truncate = false;
acc_mode = 0;
} else if (!S_ISREG(file_inode(file)->i_mode))
will_truncate = false;
audit_inode(nd->name, file->f_path.dentry, 0);
dput(dentry);
dput(nd->path.dentry);
nd->path.dentry = dentry;
error = may_open(&nd->path, acc_mode, open_flag);
if (error)
goto out;
goto opened;
}