initial_commit

1 files changed, 360 insertions, 0 deletions

diff --git a/fs/bad_inode.c b/fs/bad_inode.c
new file mode 100644
index 00000000..bfcb18fe
--- /dev/null
+++ b/fs/bad_inode.c
@@ -0,0 +1,360 @@
+/*
+ *  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);