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/*
* linux/fs/bad_inode.c
*
* Copyright (C) 1997, Stephen Tweedie
*
* Provide stub functions for unreadable inodes
*
* Fabian Frederick : August 2003 - All file operations assigned to EIO
*/
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/stat.h>
#include <linux/time.h>
#include <linux/namei.h>
#include <linux/poll.h>
static loff_t bad_file_llseek(struct file *file, loff_t offset, int origin)
{
return -EIO;
}
static ssize_t bad_file_read(struct file *filp, char __user *buf,
size_t size, loff_t *ppos)
{
return -EIO;
}
static ssize_t bad_file_write(struct file *filp, const char __user *buf,
size_t siz, loff_t *ppos)
{
return -EIO;
}
static ssize_t bad_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
return -EIO;
}
static ssize_t bad_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
return -EIO;
}
static int bad_file_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
return -EIO;
}
static unsigned int bad_file_poll(struct file *filp, poll_table *wait)
{
return POLLERR;
}
static long bad_file_unlocked_ioctl(struct file *file, unsigned cmd,
unsigned long arg)
{
return -EIO;
}
static long bad_file_compat_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
return -EIO;
}
static int bad_file_mmap(struct file *file, struct vm_area_struct *vma)
{
return -EIO;
}
static int bad_file_open(struct inode *inode, struct file *filp)
{
return -EIO;
}
static int bad_file_flush(struct file *file, fl_owner_t id)
{
return -EIO;
}
static int bad_file_release(struct inode *inode, struct file *filp)
{
return -EIO;
}
static int bad_file_fsync(struct file *file, int datasync)
{
return -EIO;
}
static int bad_file_aio_fsync(struct kiocb *iocb, int datasync)
{
return -EIO;
}
static int bad_file_fasync(int fd, struct file *filp, int on)
{
return -EIO;
}
static int bad_file_lock(struct file *file, int cmd, struct file_lock *fl)
{
return -EIO;
}
static ssize_t bad_file_sendpage(struct file *file, struct page *page,
int off, size_t len, loff_t *pos, int more)
{
return -EIO;
}
static unsigned long bad_file_get_unmapped_area(struct file *file,
unsigned long addr, unsigned long len,
unsigned long pgoff, unsigned long flags)
{
return -EIO;
}
static int bad_file_check_flags(int flags)
{
return -EIO;
}
static int bad_file_flock(struct file *filp, int cmd, struct file_lock *fl)
{
return -EIO;
}
static ssize_t bad_file_splice_write(struct pipe_inode_info *pipe,
struct file *out, loff_t *ppos, size_t len,
unsigned int flags)
{
return -EIO;
}
static ssize_t bad_file_splice_read(struct file *in, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len,
unsigned int flags)
{
return -EIO;
}
static const struct file_operations bad_file_ops =
{
.llseek = bad_file_llseek,
.read = bad_file_read,
.write = bad_file_write,
.aio_read = bad_file_aio_read,
.aio_write = bad_file_aio_write,
.readdir = bad_file_readdir,
.poll = bad_file_poll,
.unlocked_ioctl = bad_file_unlocked_ioctl,
.compat_ioctl = bad_file_compat_ioctl,
.mmap = bad_file_mmap,
.open = bad_file_open,
.flush = bad_file_flush,
.release = bad_file_release,
.fsync = bad_file_fsync,
.aio_fsync = bad_file_aio_fsync,
.fasync = bad_file_fasync,
.lock = bad_file_lock,
.sendpage = bad_file_sendpage,
.get_unmapped_area = bad_file_get_unmapped_area,
.check_flags = bad_file_check_flags,
.flock = bad_file_flock,
.splice_write = bad_file_splice_write,
.splice_read = bad_file_splice_read,
};
static int bad_inode_create (struct inode *dir, struct dentry *dentry,
int mode, struct nameidata *nd)
{
return -EIO;
}
static struct dentry *bad_inode_lookup(struct inode *dir,
struct dentry *dentry, struct nameidata *nd)
{
return ERR_PTR(-EIO);
}
static int bad_inode_link (struct dentry *old_dentry, struct inode *dir,
struct dentry *dentry)
{
return -EIO;
}
static int bad_inode_unlink(struct inode *dir, struct dentry *dentry)
{
return -EIO;
}
static int bad_inode_symlink (struct inode *dir, struct dentry *dentry,
const char *symname)
{
return -EIO;
}
static int bad_inode_mkdir(struct inode *dir, struct dentry *dentry,
int mode)
{
return -EIO;
}
static int bad_inode_rmdir (struct inode *dir, struct dentry *dentry)
{
return -EIO;
}
static int bad_inode_mknod (struct inode *dir, struct dentry *dentry,
int mode, dev_t rdev)
{
return -EIO;
}
static int bad_inode_rename (struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
return -EIO;
}
static int bad_inode_readlink(struct dentry *dentry, char __user *buffer,
int buflen)
{
return -EIO;
}
static int bad_inode_permission(struct inode *inode, int mask, unsigned int flags)
{
return -EIO;
}
static int bad_inode_getattr(struct vfsmount *mnt, struct dentry *dentry,
struct kstat *stat)
{
return -EIO;
}
static int bad_inode_setattr(struct dentry *direntry, struct iattr *attrs)
{
return -EIO;
}
static int bad_inode_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
return -EIO;
}
static ssize_t bad_inode_getxattr(struct dentry *dentry, const char *name,
void *buffer, size_t size)
{
return -EIO;
}
static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer,
size_t buffer_size)
{
return -EIO;
}
static int bad_inode_removexattr(struct dentry *dentry, const char *name)
{
return -EIO;
}
static const struct inode_operations bad_inode_ops =
{
.create = bad_inode_create,
.lookup = bad_inode_lookup,
.link = bad_inode_link,
.unlink = bad_inode_unlink,
.symlink = bad_inode_symlink,
.mkdir = bad_inode_mkdir,
.rmdir = bad_inode_rmdir,
.mknod = bad_inode_mknod,
.rename = bad_inode_rename,
.readlink = bad_inode_readlink,
/* follow_link must be no-op, otherwise unmounting this inode
won't work */
/* put_link returns void */
/* truncate returns void */
.permission = bad_inode_permission,
.getattr = bad_inode_getattr,
.setattr = bad_inode_setattr,
.setxattr = bad_inode_setxattr,
.getxattr = bad_inode_getxattr,
.listxattr = bad_inode_listxattr,
.removexattr = bad_inode_removexattr,
/* truncate_range returns void */
};
/*
* When a filesystem is unable to read an inode due to an I/O error in
* its read_inode() function, it can call make_bad_inode() to return a
* set of stubs which will return EIO errors as required.
*
* We only need to do limited initialisation: all other fields are
* preinitialised to zero automatically.
*/
/**
* make_bad_inode - mark an inode bad due to an I/O error
* @inode: Inode to mark bad
*
* When an inode cannot be read due to a media or remote network
* failure this function makes the inode "bad" and causes I/O operations
* on it to fail from this point on.
*/
void make_bad_inode(struct inode *inode)
{
remove_inode_hash(inode);
inode->i_mode = S_IFREG;
inode->i_atime = inode->i_mtime = inode->i_ctime =
current_fs_time(inode->i_sb);
inode->i_op = &bad_inode_ops;
inode->i_fop = &bad_file_ops;
}
EXPORT_SYMBOL(make_bad_inode);
/*
* This tests whether an inode has been flagged as bad. The test uses
* &bad_inode_ops to cover the case of invalidated inodes as well as
* those created by make_bad_inode() above.
*/
/**
* is_bad_inode - is an inode errored
* @inode: inode to test
*
* Returns true if the inode in question has been marked as bad.
*/
int is_bad_inode(struct inode *inode)
{
return (inode->i_op == &bad_inode_ops);
}
EXPORT_SYMBOL(is_bad_inode);
/**
* iget_failed - Mark an under-construction inode as dead and release it
* @inode: The inode to discard
*
* Mark an under-construction inode as dead and release it.
*/
void iget_failed(struct inode *inode)
{
make_bad_inode(inode);
unlock_new_inode(inode);
iput(inode);
}
EXPORT_SYMBOL(iget_failed);
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