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![Al Viro](/assets/img/avatar_default.png)
Remove the hopelessly misguided ->dir_notify(). The only instance (cifs) has been broken by design from the very beginning; the objects it creates are never destroyed, keep references to struct file they can outlive, nothing that could possibly evict them exists on close(2) path *and* no locking whatsoever is done to prevent races with close(), should the previous, er, deficiencies someday be dealt with. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
368 lines
7.9 KiB
C
368 lines
7.9 KiB
C
/*
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* linux/fs/bad_inode.c
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*
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* Copyright (C) 1997, Stephen Tweedie
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*
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* Provide stub functions for unreadable inodes
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*
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* Fabian Frederick : August 2003 - All file operations assigned to EIO
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*/
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#include <linux/fs.h>
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#include <linux/module.h>
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#include <linux/stat.h>
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#include <linux/time.h>
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#include <linux/namei.h>
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#include <linux/poll.h>
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static loff_t bad_file_llseek(struct file *file, loff_t offset, int origin)
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{
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return -EIO;
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}
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static ssize_t bad_file_read(struct file *filp, char __user *buf,
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size_t size, loff_t *ppos)
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{
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return -EIO;
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}
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static ssize_t bad_file_write(struct file *filp, const char __user *buf,
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size_t siz, loff_t *ppos)
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{
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return -EIO;
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}
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static ssize_t bad_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
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unsigned long nr_segs, loff_t pos)
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{
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return -EIO;
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}
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static ssize_t bad_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
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unsigned long nr_segs, loff_t pos)
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{
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return -EIO;
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}
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static int bad_file_readdir(struct file *filp, void *dirent, filldir_t filldir)
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{
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return -EIO;
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}
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static unsigned int bad_file_poll(struct file *filp, poll_table *wait)
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{
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return POLLERR;
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}
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static int bad_file_ioctl (struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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return -EIO;
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}
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static long bad_file_unlocked_ioctl(struct file *file, unsigned cmd,
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unsigned long arg)
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{
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return -EIO;
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}
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static long bad_file_compat_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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return -EIO;
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}
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static int bad_file_mmap(struct file *file, struct vm_area_struct *vma)
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{
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return -EIO;
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}
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static int bad_file_open(struct inode *inode, struct file *filp)
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{
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return -EIO;
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}
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static int bad_file_flush(struct file *file, fl_owner_t id)
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{
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return -EIO;
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}
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static int bad_file_release(struct inode *inode, struct file *filp)
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{
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return -EIO;
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}
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static int bad_file_fsync(struct file *file, struct dentry *dentry,
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int datasync)
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{
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return -EIO;
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}
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static int bad_file_aio_fsync(struct kiocb *iocb, int datasync)
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{
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return -EIO;
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}
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static int bad_file_fasync(int fd, struct file *filp, int on)
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{
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return -EIO;
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}
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static int bad_file_lock(struct file *file, int cmd, struct file_lock *fl)
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{
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return -EIO;
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}
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static ssize_t bad_file_sendpage(struct file *file, struct page *page,
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int off, size_t len, loff_t *pos, int more)
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{
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return -EIO;
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}
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static unsigned long bad_file_get_unmapped_area(struct file *file,
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unsigned long addr, unsigned long len,
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unsigned long pgoff, unsigned long flags)
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{
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return -EIO;
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}
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static int bad_file_check_flags(int flags)
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{
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return -EIO;
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}
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static int bad_file_flock(struct file *filp, int cmd, struct file_lock *fl)
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{
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return -EIO;
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}
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static ssize_t bad_file_splice_write(struct pipe_inode_info *pipe,
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struct file *out, loff_t *ppos, size_t len,
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unsigned int flags)
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{
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return -EIO;
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}
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static ssize_t bad_file_splice_read(struct file *in, loff_t *ppos,
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struct pipe_inode_info *pipe, size_t len,
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unsigned int flags)
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{
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return -EIO;
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}
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static const struct file_operations bad_file_ops =
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{
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.llseek = bad_file_llseek,
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.read = bad_file_read,
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.write = bad_file_write,
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.aio_read = bad_file_aio_read,
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.aio_write = bad_file_aio_write,
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.readdir = bad_file_readdir,
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.poll = bad_file_poll,
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.ioctl = bad_file_ioctl,
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.unlocked_ioctl = bad_file_unlocked_ioctl,
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.compat_ioctl = bad_file_compat_ioctl,
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.mmap = bad_file_mmap,
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.open = bad_file_open,
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.flush = bad_file_flush,
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.release = bad_file_release,
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.fsync = bad_file_fsync,
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.aio_fsync = bad_file_aio_fsync,
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.fasync = bad_file_fasync,
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.lock = bad_file_lock,
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.sendpage = bad_file_sendpage,
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.get_unmapped_area = bad_file_get_unmapped_area,
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.check_flags = bad_file_check_flags,
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.flock = bad_file_flock,
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.splice_write = bad_file_splice_write,
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.splice_read = bad_file_splice_read,
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};
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static int bad_inode_create (struct inode *dir, struct dentry *dentry,
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int mode, struct nameidata *nd)
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{
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return -EIO;
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}
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static struct dentry *bad_inode_lookup(struct inode *dir,
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struct dentry *dentry, struct nameidata *nd)
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{
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return ERR_PTR(-EIO);
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}
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static int bad_inode_link (struct dentry *old_dentry, struct inode *dir,
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struct dentry *dentry)
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{
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return -EIO;
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}
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static int bad_inode_unlink(struct inode *dir, struct dentry *dentry)
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{
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return -EIO;
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}
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static int bad_inode_symlink (struct inode *dir, struct dentry *dentry,
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const char *symname)
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{
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return -EIO;
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}
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static int bad_inode_mkdir(struct inode *dir, struct dentry *dentry,
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int mode)
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{
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return -EIO;
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}
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static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry)
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{
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return -EIO;
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}
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static int bad_inode_mknod (struct inode *dir, struct dentry *dentry,
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int mode, dev_t rdev)
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{
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return -EIO;
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}
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static int bad_inode_rename (struct inode *old_dir, struct dentry *old_dentry,
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struct inode *new_dir, struct dentry *new_dentry)
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{
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return -EIO;
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}
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static int bad_inode_readlink(struct dentry *dentry, char __user *buffer,
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int buflen)
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{
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return -EIO;
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}
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static int bad_inode_permission(struct inode *inode, int mask)
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{
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return -EIO;
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}
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static int bad_inode_getattr(struct vfsmount *mnt, struct dentry *dentry,
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struct kstat *stat)
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{
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return -EIO;
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}
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static int bad_inode_setattr(struct dentry *direntry, struct iattr *attrs)
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{
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return -EIO;
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}
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static int bad_inode_setxattr(struct dentry *dentry, const char *name,
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const void *value, size_t size, int flags)
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{
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return -EIO;
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}
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static ssize_t bad_inode_getxattr(struct dentry *dentry, const char *name,
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void *buffer, size_t size)
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{
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return -EIO;
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}
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static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer,
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size_t buffer_size)
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{
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return -EIO;
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}
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static int bad_inode_removexattr(struct dentry *dentry, const char *name)
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{
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return -EIO;
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}
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static const struct inode_operations bad_inode_ops =
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{
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.create = bad_inode_create,
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.lookup = bad_inode_lookup,
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.link = bad_inode_link,
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.unlink = bad_inode_unlink,
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.symlink = bad_inode_symlink,
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.mkdir = bad_inode_mkdir,
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.rmdir = bad_inode_rmdir,
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.mknod = bad_inode_mknod,
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.rename = bad_inode_rename,
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.readlink = bad_inode_readlink,
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/* follow_link must be no-op, otherwise unmounting this inode
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won't work */
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/* put_link returns void */
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/* truncate returns void */
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.permission = bad_inode_permission,
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.getattr = bad_inode_getattr,
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.setattr = bad_inode_setattr,
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.setxattr = bad_inode_setxattr,
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.getxattr = bad_inode_getxattr,
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.listxattr = bad_inode_listxattr,
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.removexattr = bad_inode_removexattr,
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/* truncate_range returns void */
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};
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/*
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* When a filesystem is unable to read an inode due to an I/O error in
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* its read_inode() function, it can call make_bad_inode() to return a
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* set of stubs which will return EIO errors as required.
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*
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* We only need to do limited initialisation: all other fields are
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* preinitialised to zero automatically.
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*/
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/**
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* make_bad_inode - mark an inode bad due to an I/O error
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* @inode: Inode to mark bad
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*
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* When an inode cannot be read due to a media or remote network
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* failure this function makes the inode "bad" and causes I/O operations
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* on it to fail from this point on.
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*/
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void make_bad_inode(struct inode *inode)
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{
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remove_inode_hash(inode);
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inode->i_mode = S_IFREG;
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inode->i_atime = inode->i_mtime = inode->i_ctime =
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current_fs_time(inode->i_sb);
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inode->i_op = &bad_inode_ops;
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inode->i_fop = &bad_file_ops;
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}
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EXPORT_SYMBOL(make_bad_inode);
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/*
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* This tests whether an inode has been flagged as bad. The test uses
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* &bad_inode_ops to cover the case of invalidated inodes as well as
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* those created by make_bad_inode() above.
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*/
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/**
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* is_bad_inode - is an inode errored
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* @inode: inode to test
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*
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* Returns true if the inode in question has been marked as bad.
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*/
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int is_bad_inode(struct inode *inode)
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{
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return (inode->i_op == &bad_inode_ops);
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}
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EXPORT_SYMBOL(is_bad_inode);
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/**
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* iget_failed - Mark an under-construction inode as dead and release it
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* @inode: The inode to discard
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*
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* Mark an under-construction inode as dead and release it.
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*/
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void iget_failed(struct inode *inode)
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{
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make_bad_inode(inode);
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unlock_new_inode(inode);
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iput(inode);
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}
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EXPORT_SYMBOL(iget_failed);
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