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Add basic renameat2 syscall support

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Support generic renameat2 syscall then add support for the
RENAME_NOREPLACE flag. To suppor the flag we need to check
the existance of both entries and return -EXIST.

Signed-off-by: Bryant G. Duffy-Ly <bduffyly@versity.com>
This commit is contained in:
Bryant G. Duffy-Ly
2021-11-19 16:45:41 -06:00
parent 714b7f2a84
commit 1b8e3f7c05
1 changed files with 26 additions and 2 deletions
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28
kmod/src/dir.c
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@@ -1615,8 +1615,9 @@ static int verify_ancestors(struct super_block *sb, u64 p1, u64 p2,
* from using parent/child locking orders as two groups can have both
* parent and child relationships to each other.
*/
static int scoutfs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
static int scoutfs_rename_common(struct inode *old_dir,
struct dentry *old_dentry, struct inode *new_dir,
struct dentry *new_dentry, unsigned int flags)
{
struct super_block *sb = old_dir->i_sb;
struct inode *old_inode = old_dentry->d_inode;
@@ -1688,6 +1689,11 @@ static int scoutfs_rename(struct inode *old_dir, struct dentry *old_dentry,
if (ret)
goto out_unlock;
if ((flags & RENAME_NOREPLACE) && (new_inode != NULL)) {
ret = -EEXIST;
goto out_unlock;
}
if (should_orphan(new_inode)) {
ret = scoutfs_lock_orphan(sb, SCOUTFS_LOCK_WRITE_ONLY, 0, scoutfs_ino(new_inode),
&orph_lock);
@@ -1870,6 +1876,23 @@ out_unlock:
return ret;
}
static int scoutfs_rename(struct inode *old_dir,
struct dentry *old_dentry, struct inode *new_dir,
struct dentry *new_dentry)
{
return scoutfs_rename_common(old_dir, old_dentry, new_dir, new_dentry, 0);
}
static int scoutfs_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 scoutfs_rename_common(old_dir, old_dentry, new_dir, new_dentry, flags);
}
#ifdef KC_FMODE_KABI_ITERATE
/* we only need this to set the iterate flag for kabi :/ */
static int scoutfs_dir_open(struct inode *inode, struct file *file)
@@ -1960,6 +1983,7 @@ const struct inode_operations_wrapper scoutfs_dir_iops = {
.permission = scoutfs_permission,
},
.tmpfile = scoutfs_tmpfile,
.rename2 = scoutfs_rename2,
};
void scoutfs_dir_exit(void)