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fs: make do_renameat2() take struct filename

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Pass in the struct filename pointers instead of the user string, and
update the three callers to do the same.

This behaves like do_unlinkat(), which also takes a filename struct and
puts it when it is done. Converting callers is then trivial.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-09-26 17:20:17 -06:00
parent 14587a4664
commit e886663cfd
2 changed files with 24 additions and 18 deletions
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2
fs/internal.h
View File

@ -78,6 +78,8 @@ extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
long do_rmdir(int dfd, struct filename *name);
long do_unlinkat(int dfd, struct filename *name);
int may_linkat(struct path *link);
int do_renameat2(int olddfd, struct filename *oldname, int newdfd,
struct filename *newname, unsigned int flags);
/*
* namespace.c

40
fs/namei.c
View File

@ -4346,8 +4346,8 @@ int vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
}
EXPORT_SYMBOL(vfs_rename);
static int do_renameat2(int olddfd, const char __user *oldname, int newdfd,
const char __user *newname, unsigned int flags)
int do_renameat2(int olddfd, struct filename *from, int newdfd,
struct filename *to, unsigned int flags)
{
struct dentry *old_dentry, *new_dentry;
struct dentry *trap;
@ -4355,32 +4355,30 @@ static int do_renameat2(int olddfd, const char __user *oldname, int newdfd,
struct qstr old_last, new_last;
int old_type, new_type;
struct inode *delegated_inode = NULL;
struct filename *from;
struct filename *to;
unsigned int lookup_flags = 0, target_flags = LOOKUP_RENAME_TARGET;
bool should_retry = false;
int error;
int error = -EINVAL;
if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
return -EINVAL;
goto put_both;
if ((flags & (RENAME_NOREPLACE | RENAME_WHITEOUT)) &&
(flags & RENAME_EXCHANGE))
return -EINVAL;
goto put_both;
if (flags & RENAME_EXCHANGE)
target_flags = 0;
retry:
from = filename_parentat(olddfd, getname(oldname), lookup_flags,
&old_path, &old_last, &old_type);
from = filename_parentat(olddfd, from, lookup_flags, &old_path,
&old_last, &old_type);
if (IS_ERR(from)) {
error = PTR_ERR(from);
goto exit;
goto put_new;
}
to = filename_parentat(newdfd, getname(newname), lookup_flags,
&new_path, &new_last, &new_type);
to = filename_parentat(newdfd, to, lookup_flags, &new_path, &new_last,
&new_type);
if (IS_ERR(to)) {
error = PTR_ERR(to);
goto exit1;
@ -4473,34 +4471,40 @@ static int do_renameat2(int olddfd, const char __user *oldname, int newdfd,
if (retry_estale(error, lookup_flags))
should_retry = true;
path_put(&new_path);
putname(to);
exit1:
path_put(&old_path);
putname(from);
if (should_retry) {
should_retry = false;
lookup_flags |= LOOKUP_REVAL;
goto retry;
}
exit:
put_both:
if (!IS_ERR(from))
putname(from);
put_new:
if (!IS_ERR(to))
putname(to);
return error;
}
SYSCALL_DEFINE5(renameat2, int, olddfd, const char __user *, oldname,
int, newdfd, const char __user *, newname, unsigned int, flags)
{
return do_renameat2(olddfd, oldname, newdfd, newname, flags);
return do_renameat2(olddfd, getname(oldname), newdfd, getname(newname),
flags);
}
SYSCALL_DEFINE4(renameat, int, olddfd, const char __user *, oldname,
int, newdfd, const char __user *, newname)
{
return do_renameat2(olddfd, oldname, newdfd, newname, 0);
return do_renameat2(olddfd, getname(oldname), newdfd, getname(newname),
0);
}
SYSCALL_DEFINE2(rename, const char __user *, oldname, const char __user *, newname)
{
return do_renameat2(AT_FDCWD, oldname, AT_FDCWD, newname, 0);
return do_renameat2(AT_FDCWD, getname(oldname), AT_FDCWD,
getname(newname), 0);
}
int readlink_copy(char __user *buffer, int buflen, const char *link)