diff options
Diffstat (limited to 'fs/file_table.c')
| -rw-r--r-- | fs/file_table.c | 41 |
1 files changed, 39 insertions, 2 deletions
diff --git a/fs/file_table.c b/fs/file_table.c index 0cc7bea6b51a..e49af4caf15d 100644 --- a/fs/file_table.c +++ b/fs/file_table.c @@ -184,7 +184,7 @@ struct file *alloc_empty_file_noaccount(int flags, const struct cred *cred) * @flags: O_... flags with which the new file will be opened * @fop: the 'struct file_operations' for the new file */ -struct file *alloc_file(const struct path *path, int flags, +static struct file *alloc_file(const struct path *path, int flags, const struct file_operations *fop) { struct file *file; @@ -209,7 +209,44 @@ struct file *alloc_file(const struct path *path, int flags, i_readcount_inc(path->dentry->d_inode); return file; } -EXPORT_SYMBOL(alloc_file); + +struct file *alloc_file_pseudo(struct inode *inode, struct vfsmount *mnt, + const char *name, int flags, + const struct file_operations *fops) +{ + static const struct dentry_operations anon_ops = { + .d_dname = simple_dname + }; + struct qstr this = QSTR_INIT(name, strlen(name)); + struct path path; + struct file *file; + + path.dentry = d_alloc_pseudo(mnt->mnt_sb, &this); + if (!path.dentry) + return ERR_PTR(-ENOMEM); + if (!mnt->mnt_sb->s_d_op) + d_set_d_op(path.dentry, &anon_ops); + path.mnt = mntget(mnt); + d_instantiate(path.dentry, inode); + file = alloc_file(&path, flags, fops); + if (IS_ERR(file)) { + ihold(inode); + path_put(&path); + } + return file; +} +EXPORT_SYMBOL(alloc_file_pseudo); + +struct file *alloc_file_clone(struct file *base, int flags, + const struct file_operations *fops) +{ + struct file *f = alloc_file(&base->f_path, flags, fops); + if (!IS_ERR(f)) { + path_get(&f->f_path); + f->f_mapping = base->f_mapping; + } + return f; +} /* the real guts of fput() - releasing the last reference to file */ |