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atomic_open(): reorder and clean up a bit 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2016-04-28 02:03:55 -04:00
parent 1643b43fbd
commit 384f26e28f
1 changed files with 27 additions and 34 deletions
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61
fs/namei.c
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@ -2827,14 +2827,11 @@ static int atomic_open(struct nameidata *nd, struct dentry *dentry,
int open_flag, umode_t mode,
int *opened)
{
struct dentry *const DENTRY_NOT_SET = (void *) -1UL;
struct inode *dir = nd->path.dentry->d_inode;
int error;
int acc_mode;
struct dentry *const DENTRY_NOT_SET = (void *) -1UL;
bool excl;
excl = (open_flag & (O_EXCL | O_CREAT)) == (O_EXCL | O_CREAT);
if (excl)
if (!(~open_flag & (O_EXCL | O_CREAT))) /* both O_EXCL and O_CREAT */
open_flag &= ~O_TRUNC;
if (nd->flags & LOOKUP_DIRECTORY)
@ -2845,39 +2842,35 @@ static int atomic_open(struct nameidata *nd, struct dentry *dentry,
error = dir->i_op->atomic_open(dir, dentry, file,
open_to_namei_flags(open_flag),
mode, opened);
if (error < 0)
goto out;
if (error) { /* returned 1, that is */
if (!error) {
/*
* We didn't have the inode before the open, so check open
* permission here.
*/
int acc_mode = op->acc_mode;
if (*opened & FILE_CREATED) {
WARN_ON(!(open_flag & O_CREAT));
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 (error > 0) {
if (WARN_ON(file->f_path.dentry == DENTRY_NOT_SET)) {
error = -EIO;
goto out;
} else {
if (file->f_path.dentry) {
dput(dentry);
dentry = file->f_path.dentry;
}
if (*opened & FILE_CREATED)
fsnotify_create(dir, dentry);
path->dentry = dentry;
path->mnt = nd->path.mnt;
return 1;
}
if (file->f_path.dentry) {
dput(dentry);
dentry = file->f_path.dentry;
}
if (*opened & FILE_CREATED)
fsnotify_create(dir, dentry);
path->dentry = dentry;
path->mnt = nd->path.mnt;
return 1;
}
/*
* We didn't have the inode before the open, so check open permission
* here.
*/
acc_mode = op->acc_mode;
if (*opened & FILE_CREATED) {
WARN_ON(!(open_flag & O_CREAT));
fsnotify_create(dir, dentry);
acc_mode = 0;
}
error = may_open(&file->f_path, acc_mode, open_flag);
if (WARN_ON(error > 0))
error = -EINVAL;
out:
dput(dentry);
return error;
}