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![Al Viro](/assets/img/avatar_default.png)
a) none of the callers even looks at inode or file returned by anon_inode_getfd() b) any caller that would try to look at those would be racy, since by the time it returns we might have raced with close() from another thread and that file would be pining for fjords. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
191 lines
4.9 KiB
C
191 lines
4.9 KiB
C
/*
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* fs/anon_inodes.c
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*
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* Copyright (C) 2007 Davide Libenzi <davidel@xmailserver.org>
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*
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* Thanks to Arnd Bergmann for code review and suggestions.
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* More changes for Thomas Gleixner suggestions.
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*
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*/
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#include <linux/file.h>
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#include <linux/poll.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/mount.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/magic.h>
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#include <linux/anon_inodes.h>
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#include <asm/uaccess.h>
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static struct vfsmount *anon_inode_mnt __read_mostly;
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static struct inode *anon_inode_inode;
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static const struct file_operations anon_inode_fops;
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static int anon_inodefs_get_sb(struct file_system_type *fs_type, int flags,
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const char *dev_name, void *data,
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struct vfsmount *mnt)
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{
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return get_sb_pseudo(fs_type, "anon_inode:", NULL, ANON_INODE_FS_MAGIC,
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mnt);
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}
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static int anon_inodefs_delete_dentry(struct dentry *dentry)
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{
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/*
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* We faked vfs to believe the dentry was hashed when we created it.
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* Now we restore the flag so that dput() will work correctly.
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*/
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dentry->d_flags |= DCACHE_UNHASHED;
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return 1;
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}
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static struct file_system_type anon_inode_fs_type = {
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.name = "anon_inodefs",
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.get_sb = anon_inodefs_get_sb,
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.kill_sb = kill_anon_super,
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};
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static struct dentry_operations anon_inodefs_dentry_operations = {
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.d_delete = anon_inodefs_delete_dentry,
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};
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/**
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* anon_inode_getfd - creates a new file instance by hooking it up to an
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* anonymous inode, and a dentry that describe the "class"
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* of the file
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*
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* @name: [in] name of the "class" of the new file
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* @fops [in] file operations for the new file
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* @priv [in] private data for the new file (will be file's private_data)
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*
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* Creates a new file by hooking it on a single inode. This is useful for files
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* that do not need to have a full-fledged inode in order to operate correctly.
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* All the files created with anon_inode_getfd() will share a single inode,
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* hence saving memory and avoiding code duplication for the file/inode/dentry
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* setup. Returns new descriptor or -error.
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*/
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int anon_inode_getfd(const char *name, const struct file_operations *fops,
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void *priv)
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{
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struct qstr this;
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struct dentry *dentry;
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struct file *file;
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int error, fd;
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if (IS_ERR(anon_inode_inode))
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return -ENODEV;
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error = get_unused_fd();
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if (error < 0)
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return error;
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fd = error;
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/*
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* Link the inode to a directory entry by creating a unique name
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* using the inode sequence number.
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*/
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error = -ENOMEM;
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this.name = name;
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this.len = strlen(name);
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this.hash = 0;
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dentry = d_alloc(anon_inode_mnt->mnt_sb->s_root, &this);
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if (!dentry)
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goto err_put_unused_fd;
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/*
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* We know the anon_inode inode count is always greater than zero,
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* so we can avoid doing an igrab() and we can use an open-coded
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* atomic_inc().
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*/
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atomic_inc(&anon_inode_inode->i_count);
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dentry->d_op = &anon_inodefs_dentry_operations;
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/* Do not publish this dentry inside the global dentry hash table */
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dentry->d_flags &= ~DCACHE_UNHASHED;
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d_instantiate(dentry, anon_inode_inode);
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error = -ENFILE;
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file = alloc_file(anon_inode_mnt, dentry,
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FMODE_READ | FMODE_WRITE, fops);
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if (!file)
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goto err_dput;
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file->f_mapping = anon_inode_inode->i_mapping;
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file->f_pos = 0;
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file->f_flags = O_RDWR;
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file->f_version = 0;
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file->private_data = priv;
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fd_install(fd, file);
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return fd;
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err_dput:
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dput(dentry);
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err_put_unused_fd:
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put_unused_fd(fd);
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return error;
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}
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EXPORT_SYMBOL_GPL(anon_inode_getfd);
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/*
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* A single inode exists for all anon_inode files. Contrary to pipes,
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* anon_inode inodes have no associated per-instance data, so we need
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* only allocate one of them.
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*/
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static struct inode *anon_inode_mkinode(void)
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{
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struct inode *inode = new_inode(anon_inode_mnt->mnt_sb);
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if (!inode)
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return ERR_PTR(-ENOMEM);
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inode->i_fop = &anon_inode_fops;
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/*
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* Mark the inode dirty from the very beginning,
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* that way it will never be moved to the dirty
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* list because mark_inode_dirty() will think
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* that it already _is_ on the dirty list.
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*/
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inode->i_state = I_DIRTY;
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inode->i_mode = S_IRUSR | S_IWUSR;
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inode->i_uid = current->fsuid;
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inode->i_gid = current->fsgid;
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inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
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return inode;
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}
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static int __init anon_inode_init(void)
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{
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int error;
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error = register_filesystem(&anon_inode_fs_type);
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if (error)
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goto err_exit;
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anon_inode_mnt = kern_mount(&anon_inode_fs_type);
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if (IS_ERR(anon_inode_mnt)) {
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error = PTR_ERR(anon_inode_mnt);
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goto err_unregister_filesystem;
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}
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anon_inode_inode = anon_inode_mkinode();
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if (IS_ERR(anon_inode_inode)) {
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error = PTR_ERR(anon_inode_inode);
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goto err_mntput;
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}
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return 0;
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err_mntput:
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mntput(anon_inode_mnt);
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err_unregister_filesystem:
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unregister_filesystem(&anon_inode_fs_type);
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err_exit:
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panic(KERN_ERR "anon_inode_init() failed (%d)\n", error);
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}
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fs_initcall(anon_inode_init);
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