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-rw-r--r--fs/ext4/namei.c11
-rw-r--r--fs/namei.c21
-rw-r--r--include/uapi/linux/fs.h2
3 files changed, 26 insertions, 8 deletions
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index d050e043e884..5f19171b3e1f 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -3204,6 +3204,16 @@ end_rename:
return retval;
}
+static int ext4_rename2(struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry,
+ unsigned int flags)
+{
+ if (flags & ~RENAME_NOREPLACE)
+ return -EINVAL;
+
+ return ext4_rename(old_dir, old_dentry, new_dir, new_dentry);
+}
+
/*
* directories can handle most operations...
*/
@@ -3218,6 +3228,7 @@ const struct inode_operations ext4_dir_inode_operations = {
.mknod = ext4_mknod,
.tmpfile = ext4_tmpfile,
.rename = ext4_rename,
+ .rename2 = ext4_rename2,
.setattr = ext4_setattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
diff --git a/fs/namei.c b/fs/namei.c
index ab4e48c4a80a..0e9d186b7f77 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -4142,7 +4142,7 @@ SYSCALL_DEFINE5(renameat2, int, olddfd, const char __user *, oldname,
bool should_retry = false;
int error;
- if (flags)
+ if (flags & ~RENAME_NOREPLACE)
return -EINVAL;
retry:
@@ -4168,6 +4168,8 @@ retry:
goto exit2;
new_dir = newnd.path.dentry;
+ if (flags & RENAME_NOREPLACE)
+ error = -EEXIST;
if (newnd.last_type != LAST_NORM)
goto exit2;
@@ -4190,22 +4192,25 @@ retry_deleg:
error = -ENOENT;
if (d_is_negative(old_dentry))
goto exit4;
+ new_dentry = lookup_hash(&newnd);
+ error = PTR_ERR(new_dentry);
+ if (IS_ERR(new_dentry))
+ goto exit4;
+ error = -EEXIST;
+ if ((flags & RENAME_NOREPLACE) && d_is_positive(new_dentry))
+ goto exit5;
/* unless the source is a directory trailing slashes give -ENOTDIR */
if (!d_is_dir(old_dentry)) {
error = -ENOTDIR;
if (oldnd.last.name[oldnd.last.len])
- goto exit4;
+ goto exit5;
if (newnd.last.name[newnd.last.len])
- goto exit4;
+ goto exit5;
}
/* source should not be ancestor of target */
error = -EINVAL;
if (old_dentry == trap)
- goto exit4;
- new_dentry = lookup_hash(&newnd);
- error = PTR_ERR(new_dentry);
- if (IS_ERR(new_dentry))
- goto exit4;
+ goto exit5;
/* target should not be an ancestor of source */
error = -ENOTEMPTY;
if (new_dentry == trap)
diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index 6c28b61bb690..9250f4dd7d96 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -35,6 +35,8 @@
#define SEEK_HOLE 4 /* seek to the next hole */
#define SEEK_MAX SEEK_HOLE
+#define RENAME_NOREPLACE (1 << 0) /* Don't overwrite target */
+
struct fstrim_range {
__u64 start;
__u64 len;