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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [fs/] [bad_inode.c] - Rev 1774
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/* * linux/fs/bad_inode.c * * Copyright (C) 1997, Stephen Tweedie * * Provide stub functions for unreadable inodes */ #include <linux/fs.h> #include <linux/stat.h> #include <linux/sched.h> /* * The follow_link operation is special: it must behave as a no-op * so that a bad root inode can at least be unmounted. To do this * we must dput() the base and return the dentry with a dget(). */ static int bad_follow_link(struct dentry *dent, struct nameidata *nd) { return vfs_follow_link(nd, ERR_PTR(-EIO)); } static int return_EIO(void) { return -EIO; } #define EIO_ERROR ((void *) (return_EIO)) static struct file_operations bad_file_ops = { llseek: EIO_ERROR, read: EIO_ERROR, write: EIO_ERROR, readdir: EIO_ERROR, poll: EIO_ERROR, ioctl: EIO_ERROR, mmap: EIO_ERROR, open: EIO_ERROR, flush: EIO_ERROR, release: EIO_ERROR, fsync: EIO_ERROR, fasync: EIO_ERROR, lock: EIO_ERROR, }; struct inode_operations bad_inode_ops = { create: EIO_ERROR, lookup: EIO_ERROR, link: EIO_ERROR, unlink: EIO_ERROR, symlink: EIO_ERROR, mkdir: EIO_ERROR, rmdir: EIO_ERROR, mknod: EIO_ERROR, rename: EIO_ERROR, readlink: EIO_ERROR, follow_link: bad_follow_link, truncate: EIO_ERROR, permission: EIO_ERROR, revalidate: EIO_ERROR, }; /* * 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) { inode->i_mode = S_IFREG; inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; inode->i_op = &bad_inode_ops; inode->i_fop = &bad_file_ops; } /* * 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); }
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