122 строки
2.8 KiB
C
122 строки
2.8 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/smp_lock.h>
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#include <linux/namei.h>
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static int return_EIO(void)
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{
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return -EIO;
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}
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#define EIO_ERROR ((void *) (return_EIO))
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static const struct file_operations bad_file_ops =
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{
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.llseek = EIO_ERROR,
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.aio_read = EIO_ERROR,
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.read = EIO_ERROR,
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.write = EIO_ERROR,
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.aio_write = EIO_ERROR,
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.readdir = EIO_ERROR,
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.poll = EIO_ERROR,
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.ioctl = EIO_ERROR,
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.mmap = EIO_ERROR,
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.open = EIO_ERROR,
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.flush = EIO_ERROR,
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.release = EIO_ERROR,
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.fsync = EIO_ERROR,
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.aio_fsync = EIO_ERROR,
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.fasync = EIO_ERROR,
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.lock = EIO_ERROR,
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.sendfile = EIO_ERROR,
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.sendpage = EIO_ERROR,
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.get_unmapped_area = EIO_ERROR,
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};
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static struct inode_operations bad_inode_ops =
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{
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.create = EIO_ERROR,
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.lookup = EIO_ERROR,
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.link = EIO_ERROR,
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.unlink = EIO_ERROR,
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.symlink = EIO_ERROR,
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.mkdir = EIO_ERROR,
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.rmdir = EIO_ERROR,
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.mknod = EIO_ERROR,
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.rename = EIO_ERROR,
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.readlink = EIO_ERROR,
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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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.truncate = EIO_ERROR,
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.permission = EIO_ERROR,
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.getattr = EIO_ERROR,
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.setattr = EIO_ERROR,
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.setxattr = EIO_ERROR,
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.getxattr = EIO_ERROR,
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.listxattr = EIO_ERROR,
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.removexattr = EIO_ERROR,
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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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