[O_TMPFILE] it's still short a few helpers, but infrastructure should be OK now...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/dcache.c b/fs/dcache.c
index f09b908..b7f049c 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -2968,6 +2968,22 @@
goto again;
}
+void d_tmpfile(struct dentry *dentry, struct inode *inode)
+{
+ inode_dec_link_count(inode);
+ BUG_ON(dentry->d_name.name != dentry->d_iname ||
+ !hlist_unhashed(&dentry->d_alias) ||
+ !d_unlinked(dentry));
+ spin_lock(&dentry->d_parent->d_lock);
+ spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
+ dentry->d_name.len = sprintf(dentry->d_iname, "#%llu",
+ (unsigned long long)inode->i_ino);
+ spin_unlock(&dentry->d_lock);
+ spin_unlock(&dentry->d_parent->d_lock);
+ d_instantiate(dentry, inode);
+}
+EXPORT_SYMBOL(d_tmpfile);
+
/**
* find_inode_number - check for dentry with name
* @dir: directory to check
diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c
index 73b0d95..256dd5f 100644
--- a/fs/ext2/namei.c
+++ b/fs/ext2/namei.c
@@ -119,6 +119,29 @@
return ext2_add_nondir(dentry, inode);
}
+static int ext2_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
+{
+ struct inode *inode = ext2_new_inode(dir, mode, NULL);
+ if (IS_ERR(inode))
+ return PTR_ERR(inode);
+
+ inode->i_op = &ext2_file_inode_operations;
+ if (ext2_use_xip(inode->i_sb)) {
+ inode->i_mapping->a_ops = &ext2_aops_xip;
+ inode->i_fop = &ext2_xip_file_operations;
+ } else if (test_opt(inode->i_sb, NOBH)) {
+ inode->i_mapping->a_ops = &ext2_nobh_aops;
+ inode->i_fop = &ext2_file_operations;
+ } else {
+ inode->i_mapping->a_ops = &ext2_aops;
+ inode->i_fop = &ext2_file_operations;
+ }
+ mark_inode_dirty(inode);
+ d_tmpfile(dentry, inode);
+ unlock_new_inode(inode);
+ return 0;
+}
+
static int ext2_mknod (struct inode * dir, struct dentry *dentry, umode_t mode, dev_t rdev)
{
struct inode * inode;
@@ -398,6 +421,7 @@
#endif
.setattr = ext2_setattr,
.get_acl = ext2_get_acl,
+ .tmpfile = ext2_tmpfile,
};
const struct inode_operations ext2_special_inode_operations = {
diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index 0db73d9..cd950e2 100644
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -54,6 +54,18 @@
return error;
}
+static int minix_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
+{
+ int error;
+ struct inode *inode = minix_new_inode(dir, mode, &error);
+ if (inode) {
+ minix_set_inode(inode, 0);
+ mark_inode_dirty(inode);
+ d_tmpfile(dentry, inode);
+ }
+ return error;
+}
+
static int minix_create(struct inode *dir, struct dentry *dentry, umode_t mode,
bool excl)
{
@@ -254,4 +266,5 @@
.mknod = minix_mknod,
.rename = minix_rename,
.getattr = minix_getattr,
+ .tmpfile = minix_tmpfile,
};
diff --git a/fs/namei.c b/fs/namei.c
index 402eda3..778e253 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2902,6 +2902,61 @@
goto retry_lookup;
}
+static int do_tmpfile(int dfd, struct filename *pathname,
+ struct nameidata *nd, int flags,
+ const struct open_flags *op,
+ struct file *file, int *opened)
+{
+ static const struct qstr name = QSTR_INIT("/", 1);
+ struct dentry *dentry, *child;
+ struct inode *dir;
+ int error = path_lookupat(dfd, pathname->name,
+ flags | LOOKUP_DIRECTORY, nd);
+ if (unlikely(error))
+ return error;
+ error = mnt_want_write(nd->path.mnt);
+ if (unlikely(error))
+ goto out;
+ /* we want directory to be writable */
+ error = inode_permission(nd->inode, MAY_WRITE | MAY_EXEC);
+ if (error)
+ goto out2;
+ dentry = nd->path.dentry;
+ dir = dentry->d_inode;
+ if (!dir->i_op->tmpfile) {
+ error = -EOPNOTSUPP;
+ goto out2;
+ }
+ child = d_alloc(dentry, &name);
+ if (unlikely(!child)) {
+ error = -ENOMEM;
+ goto out2;
+ }
+ nd->flags &= ~LOOKUP_DIRECTORY;
+ nd->flags |= op->intent;
+ dput(nd->path.dentry);
+ nd->path.dentry = child;
+ error = dir->i_op->tmpfile(dir, nd->path.dentry, op->mode);
+ if (error)
+ goto out2;
+ audit_inode(pathname, nd->path.dentry, 0);
+ error = may_open(&nd->path, op->acc_mode, op->open_flag);
+ if (error)
+ goto out2;
+ file->f_path.mnt = nd->path.mnt;
+ error = finish_open(file, nd->path.dentry, NULL, opened);
+ if (error)
+ goto out2;
+ error = open_check_o_direct(file);
+ if (error)
+ fput(file);
+out2:
+ mnt_drop_write(nd->path.mnt);
+out:
+ path_put(&nd->path);
+ return error;
+}
+
static struct file *path_openat(int dfd, struct filename *pathname,
struct nameidata *nd, const struct open_flags *op, int flags)
{
@@ -2917,6 +2972,11 @@
file->f_flags = op->open_flag;
+ if (unlikely(file->f_flags & O_TMPFILE)) {
+ error = do_tmpfile(dfd, pathname, nd, flags, op, file, &opened);
+ goto out;
+ }
+
error = path_init(dfd, pathname->name, flags | LOOKUP_PARENT, nd, &base);
if (unlikely(error))
goto out;
diff --git a/fs/open.c b/fs/open.c
index 5a40a4a..fca72c4 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -840,11 +840,15 @@
if (flags & __O_SYNC)
flags |= O_DSYNC;
- /*
- * If we have O_PATH in the open flag. Then we
- * cannot have anything other than the below set of flags
- */
- if (flags & O_PATH) {
+ if (flags & O_TMPFILE) {
+ if (!(flags & O_CREAT))
+ return -EINVAL;
+ acc_mode = MAY_OPEN | ACC_MODE(flags);
+ } else if (flags & O_PATH) {
+ /*
+ * If we have O_PATH in the open flag. Then we
+ * cannot have anything other than the below set of flags
+ */
flags &= O_DIRECTORY | O_NOFOLLOW | O_PATH;
acc_mode = 0;
} else {