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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/export.h>
#include <linux/stat.h>
#include <linux/time.h>
#include <linux/namei.h>
#include <linux/poll.h>
static int bad_file_open(struct inode *inode, struct file *filp)
{
return -EIO;
}
static const struct file_operations bad_file_ops =
{
.open = bad_file_open,
};
static int bad_inode_create (struct inode *dir, struct dentry *dentry,
umode_t mode, bool excl)
{
return -EIO;
}
static struct dentry *bad_inode_lookup(struct inode *dir,
struct dentry *dentry, unsigned int flags)
{
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,
umode_t 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,
umode_t mode, dev_t rdev)
{
return -EIO;
}
static int bad_inode_rename2(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry,
unsigned int flags)
{
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)
{
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,
.rename2 = bad_inode_rename2,
.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,
};
/*
* 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.
*/
bool 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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