From: Miklos Szeredi <mszeredi@xxxxxxx>
Support RENAME_NOREPLACE and RENAME_EXCHANGE flags on hostfs if the
underlying filesystem supports it.
Since renameat2(2) is not yet in any libc, use syscall(2) to invoke the
renameat2 syscall.
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxx>
Cc: Richard Weinberger <richard@xxxxxx>
---
fs/hostfs/hostfs.h | 1 +
fs/hostfs/hostfs_kern.c | 35 ++++++++++++++++++++++++++---------
fs/hostfs/hostfs_user.c | 28 ++++++++++++++++++++++++++++
3 files changed, 55 insertions(+), 9 deletions(-)
--- a/fs/hostfs/hostfs.h
+++ b/fs/hostfs/hostfs.h
@@ -89,6 +89,7 @@ extern int do_mknod(const char *file, in
extern int link_file(const char *from, const char *to);
extern int hostfs_do_readlink(char *file, char *buf, int size);
extern int rename_file(char *from, char *to);
+extern int rename2_file(char *from, char *to, unsigned int flags);
extern int do_statfs(char *root, long *bsize_out, long long *blocks_out,
long long *bfree_out, long long *bavail_out,
long long *files_out, long long *ffree_out,
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -741,24 +741,40 @@ static int hostfs_mknod(struct inode *di
return err;
}
-static int hostfs_rename(struct inode *from_ino, struct dentry *from,
- struct inode *to_ino, struct dentry *to)
+static int hostfs_rename2(struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry,
+ unsigned int flags)
{
- char *from_name, *to_name;
+ char *old_name, *new_name;
int err;
- if ((from_name = dentry_name(from)) == NULL)
+ if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
+ return -EINVAL;
+
+ old_name = dentry_name(old_dentry);
+ if (old_name == NULL)
return -ENOMEM;
- if ((to_name = dentry_name(to)) == NULL) {
- __putname(from_name);
+ new_name = dentry_name(new_dentry);
+ if (new_name == NULL) {
+ __putname(old_name);
return -ENOMEM;
}
- err = rename_file(from_name, to_name);
- __putname(from_name);
- __putname(to_name);
+ if (!flags)
+ err = rename_file(old_name, new_name);
+ else
+ err = rename2_file(old_name, new_name, flags);
+
+ __putname(old_name);
+ __putname(new_name);
return err;
}
+static int hostfs_rename(struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry)
+{
+ return hostfs_rename2(old_dir, old_dentry, new_dir, new_dentry, 0);
+}
+
static int hostfs_permission(struct inode *ino, int desired)
{
char *name;
@@ -868,6 +884,7 @@ static const struct inode_operations hos
.rmdir = hostfs_rmdir,
.mknod = hostfs_mknod,
.rename = hostfs_rename,
+ .rename2 = hostfs_rename2,
.permission = hostfs_permission,
.setattr = hostfs_setattr,
};
--- a/fs/hostfs/hostfs_user.c
+++ b/fs/hostfs/hostfs_user.c
@@ -14,6 +14,7 @@
#include <sys/time.h>
#include <sys/types.h>
#include <sys/vfs.h>
+#include <sys/syscall.h>
#include "hostfs.h"
#include <utime.h>
@@ -360,6 +361,33 @@ int rename_file(char *from, char *to)
return 0;
}
+int rename2_file(char *from, char *to, unsigned int flags)
+{
+ int err;
+
+#ifndef SYS_renameat2
+# ifdef __x86_64__
+# define SYS_renameat2 316
+# endif
+# ifdef __i386__
+# define SYS_renameat2 353
+# endif
+#endif
+
+#ifdef SYS_renameat2
+ err = syscall(SYS_renameat2, AT_FDCWD, from, AT_FDCWD, to, flags);
+ if (err < 0) {
+ if (errno != ENOSYS)
+ return -errno;
+ else
+ return -EINVAL;
+ }
+ return 0;
+#else
+ return -EINVAL;
+#endif
+}
+
int do_statfs(char *root, long *bsize_out, long long *blocks_out,
long long *bfree_out, long long *bavail_out,
long long *files_out, long long *ffree_out,
--
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