1 files changed, 0 insertions, 478 deletions

diff --git a/mm/filemap_xip.c b/mm/filemap_xip.c
deleted file mode 100644
index 0d105aeff82f..000000000000
--- a/mm/filemap_xip.c
+++ /dev/null
@@ -1,478 +0,0 @@
-/*
- *	linux/mm/filemap_xip.c
- *
- * Copyright (C) 2005 IBM Corporation
- * Author: Carsten Otte <cotte@de.ibm.com>
- *
- * derived from linux/mm/filemap.c - Copyright (C) Linus Torvalds
- *
- */
-
-#include <linux/fs.h>
-#include <linux/pagemap.h>
-#include <linux/export.h>
-#include <linux/uio.h>
-#include <linux/rmap.h>
-#include <linux/mmu_notifier.h>
-#include <linux/sched.h>
-#include <linux/seqlock.h>
-#include <linux/mutex.h>
-#include <linux/gfp.h>
-#include <asm/tlbflush.h>
-#include <asm/io.h>
-
-/*
- * We do use our own empty page to avoid interference with other users
- * of ZERO_PAGE(), such as /dev/zero
- */
-static DEFINE_MUTEX(xip_sparse_mutex);
-static seqcount_t xip_sparse_seq = SEQCNT_ZERO(xip_sparse_seq);
-static struct page *__xip_sparse_page;
-
-/* called under xip_sparse_mutex */
-static struct page *xip_sparse_page(void)
-{
-	if (!__xip_sparse_page) {
-		struct page *page = alloc_page(GFP_HIGHUSER | __GFP_ZERO);
-
-		if (page)
-			__xip_sparse_page = page;
-	}
-	return __xip_sparse_page;
-}
-
-/*
- * This is a file read routine for execute in place files, and uses
- * the mapping->a_ops->get_xip_mem() function for the actual low-level
- * stuff.
- *
- * Note the struct file* is not used at all.  It may be NULL.
- */
-static ssize_t
-do_xip_mapping_read(struct address_space *mapping,
-		    struct file_ra_state *_ra,
-		    struct file *filp,
-		    char __user *buf,
-		    size_t len,
-		    loff_t *ppos)
-{
-	struct inode *inode = mapping->host;
-	pgoff_t index, end_index;
-	unsigned long offset;
-	loff_t isize, pos;
-	size_t copied = 0, error = 0;
-
-	BUG_ON(!mapping->a_ops->get_xip_mem);
-
-	pos = *ppos;
-	index = pos >> PAGE_CACHE_SHIFT;
-	offset = pos & ~PAGE_CACHE_MASK;
-
-	isize = i_size_read(inode);
-	if (!isize)
-		goto out;
-
-	end_index = (isize - 1) >> PAGE_CACHE_SHIFT;
-	do {
-		unsigned long nr, left;
-		void *xip_mem;
-		unsigned long xip_pfn;
-		int zero = 0;
-
-		/* nr is the maximum number of bytes to copy from this page */
-		nr = PAGE_CACHE_SIZE;
-		if (index >= end_index) {
-			if (index > end_index)
-				goto out;
-			nr = ((isize - 1) & ~PAGE_CACHE_MASK) + 1;
-			if (nr <= offset) {
-				goto out;
-			}
-		}
-		nr = nr - offset;
-		if (nr > len - copied)
-			nr = len - copied;
-
-		error = mapping->a_ops->get_xip_mem(mapping, index, 0,
-							&xip_mem, &xip_pfn);
-		if (unlikely(error)) {
-			if (error == -ENODATA) {
-				/* sparse */
-				zero = 1;
-			} else
-				goto out;
-		}
-
-		/* If users can be writing to this page using arbitrary
-		 * virtual addresses, take care about potential aliasing
-		 * before reading the page on the kernel side.
-		 */
-		if (mapping_writably_mapped(mapping))
-			/* address based flush */ ;
-
-		/*
-		 * Ok, we have the mem, so now we can copy it to user space...
-		 *
-		 * The actor routine returns how many bytes were actually used..
-		 * NOTE! This may not be the same as how much of a user buffer
-		 * we filled up (we may be padding etc), so we can only update
-		 * "pos" here (the actor routine has to update the user buffer
-		 * pointers and the remaining count).
-		 */
-		if (!zero)
-			left = __copy_to_user(buf+copied, xip_mem+offset, nr);
-		else
-			left = __clear_user(buf + copied, nr);
-
-		if (left) {
-			error = -EFAULT;
-			goto out;
-		}
-
-		copied += (nr - left);
-		offset += (nr - left);
-		index += offset >> PAGE_CACHE_SHIFT;
-		offset &= ~PAGE_CACHE_MASK;
-	} while (copied < len);
-
-out:
-	*ppos = pos + copied;
-	if (filp)
-		file_accessed(filp);
-
-	return (copied ? copied : error);
-}
-
-ssize_t
-xip_file_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos)
-{
-	if (!access_ok(VERIFY_WRITE, buf, len))
-		return -EFAULT;
-
-	return do_xip_mapping_read(filp->f_mapping, &filp->f_ra, filp,
-			    buf, len, ppos);
-}
-EXPORT_SYMBOL_GPL(xip_file_read);
-
-/*
- * __xip_unmap is invoked from xip_unmap and xip_write
- *
- * This function walks all vmas of the address_space and unmaps the
- * __xip_sparse_page when found at pgoff.
- */
-static void __xip_unmap(struct address_space * mapping, unsigned long pgoff)
-{
-	struct vm_area_struct *vma;
-	struct page *page;
-	unsigned count;
-	int locked = 0;
-
-	count = read_seqcount_begin(&xip_sparse_seq);
-
-	page = __xip_sparse_page;
-	if (!page)
-		return;
-
-retry:
-	i_mmap_lock_read(mapping);
-	vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) {
-		pte_t *pte, pteval;
-		spinlock_t *ptl;
-		struct mm_struct *mm = vma->vm_mm;
-		unsigned long address = vma->vm_start +
-			((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
-
-		BUG_ON(address < vma->vm_start || address >= vma->vm_end);
-		pte = page_check_address(page, mm, address, &ptl, 1);
-		if (pte) {
-			/* Nuke the page table entry. */
-			flush_cache_page(vma, address, pte_pfn(*pte));
-			pteval = ptep_clear_flush(vma, address, pte);
-			page_remove_rmap(page);
-			dec_mm_counter(mm, MM_FILEPAGES);
-			BUG_ON(pte_dirty(pteval));
-			pte_unmap_unlock(pte, ptl);
-			/* must invalidate_page _before_ freeing the page */
-			mmu_notifier_invalidate_page(mm, address);
-			page_cache_release(page);
-		}
-	}
-	i_mmap_unlock_read(mapping);
-
-	if (locked) {
-		mutex_unlock(&xip_sparse_mutex);
-	} else if (read_seqcount_retry(&xip_sparse_seq, count)) {
-		mutex_lock(&xip_sparse_mutex);
-		locked = 1;
-		goto retry;
-	}
-}
-
-/*
- * xip_fault() is invoked via the vma operations vector for a
- * mapped memory region to read in file data during a page fault.
- *
- * This function is derived from filemap_fault, but used for execute in place
- */
-static int xip_file_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
-{
-	struct file *file = vma->vm_file;
-	struct address_space *mapping = file->f_mapping;
-	struct inode *inode = mapping->host;
-	pgoff_t size;
-	void *xip_mem;
-	unsigned long xip_pfn;
-	struct page *page;
-	int error;
-
-	/* XXX: are VM_FAULT_ codes OK? */
-again:
-	size = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
-	if (vmf->pgoff >= size)
-		return VM_FAULT_SIGBUS;
-
-	error = mapping->a_ops->get_xip_mem(mapping, vmf->pgoff, 0,
-						&xip_mem, &xip_pfn);
-	if (likely(!error))
-		goto found;
-	if (error != -ENODATA)
-		return VM_FAULT_OOM;
-
-	/* sparse block */
-	if ((vma->vm_flags & (VM_WRITE | VM_MAYWRITE)) &&
-	    (vma->vm_flags & (VM_SHARED | VM_MAYSHARE)) &&
-	    (!(mapping->host->i_sb->s_flags & MS_RDONLY))) {
-		int err;
-
-		/* maybe shared writable, allocate new block */
-		mutex_lock(&xip_sparse_mutex);
-		error = mapping->a_ops->get_xip_mem(mapping, vmf->pgoff, 1,
-							&xip_mem, &xip_pfn);
-		mutex_unlock(&xip_sparse_mutex);
-		if (error)
-			return VM_FAULT_SIGBUS;
-		/* unmap sparse mappings at pgoff from all other vmas */
-		__xip_unmap(mapping, vmf->pgoff);
-
-found:
-		err = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address,
-							xip_pfn);
-		if (err == -ENOMEM)
-			return VM_FAULT_OOM;
-		/*
-		 * err == -EBUSY is fine, we've raced against another thread
-		 * that faulted-in the same page
-		 */
-		if (err != -EBUSY)
-			BUG_ON(err);
-		return VM_FAULT_NOPAGE;
-	} else {
-		int err, ret = VM_FAULT_OOM;
-
-		mutex_lock(&xip_sparse_mutex);
-		write_seqcount_begin(&xip_sparse_seq);
-		error = mapping->a_ops->get_xip_mem(mapping, vmf->pgoff, 0,
-							&xip_mem, &xip_pfn);
-		if (unlikely(!error)) {
-			write_seqcount_end(&xip_sparse_seq);
-			mutex_unlock(&xip_sparse_mutex);
-			goto again;
-		}
-		if (error != -ENODATA)
-			goto out;
-		/* not shared and writable, use xip_sparse_page() */
-		page = xip_sparse_page();
-		if (!page)
-			goto out;
-		err = vm_insert_page(vma, (unsigned long)vmf->virtual_address,
-							page);
-		if (err == -ENOMEM)
-			goto out;
-
-		ret = VM_FAULT_NOPAGE;
-out:
-		write_seqcount_end(&xip_sparse_seq);
-		mutex_unlock(&xip_sparse_mutex);
-
-		return ret;
-	}
-}
-
-static const struct vm_operations_struct xip_file_vm_ops = {
-	.fault	= xip_file_fault,
-	.page_mkwrite	= filemap_page_mkwrite,
-	.remap_pages = generic_file_remap_pages,
-};
-
-int xip_file_mmap(struct file * file, struct vm_area_struct * vma)
-{
-	BUG_ON(!file->f_mapping->a_ops->get_xip_mem);
-
-	file_accessed(file);
-	vma->vm_ops = &xip_file_vm_ops;
-	vma->vm_flags |= VM_MIXEDMAP;
-	return 0;
-}
-EXPORT_SYMBOL_GPL(xip_file_mmap);
-
-static ssize_t
-__xip_file_write(struct file *filp, const char __user *buf,
-		  size_t count, loff_t pos, loff_t *ppos)
-{
-	struct address_space * mapping = filp->f_mapping;
-	const struct address_space_operations *a_ops = mapping->a_ops;
-	struct inode 	*inode = mapping->host;
-	long		status = 0;
-	size_t		bytes;
-	ssize_t		written = 0;
-
-	BUG_ON(!mapping->a_ops->get_xip_mem);
-
-	do {
-		unsigned long index;
-		unsigned long offset;
-		size_t copied;
-		void *xip_mem;
-		unsigned long xip_pfn;
-
-		offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */
-		index = pos >> PAGE_CACHE_SHIFT;
-		bytes = PAGE_CACHE_SIZE - offset;
-		if (bytes > count)
-			bytes = count;
-
-		status = a_ops->get_xip_mem(mapping, index, 0,
-						&xip_mem, &xip_pfn);
-		if (status == -ENODATA) {
-			/* we allocate a new page unmap it */
-			mutex_lock(&xip_sparse_mutex);
-			status = a_ops->get_xip_mem(mapping, index, 1,
-							&xip_mem, &xip_pfn);
-			mutex_unlock(&xip_sparse_mutex);
-			if (!status)
-				/* unmap page at pgoff from all other vmas */
-				__xip_unmap(mapping, index);
-		}
-
-		if (status)
-			break;
-
-		copied = bytes -
-			__copy_from_user_nocache(xip_mem + offset, buf, bytes);
-
-		if (likely(copied > 0)) {
-			status = copied;
-
-			if (status >= 0) {
-				written += status;
-				count -= status;
-				pos += status;
-				buf += status;
-			}
-		}
-		if (unlikely(copied != bytes))
-			if (status >= 0)
-				status = -EFAULT;
-		if (status < 0)
-			break;
-	} while (count);
-	*ppos = pos;
-	/*
-	 * No need to use i_size_read() here, the i_size
-	 * cannot change under us because we hold i_mutex.
-	 */
-	if (pos > inode->i_size) {
-		i_size_write(inode, pos);
-		mark_inode_dirty(inode);
-	}
-
-	return written ? written : status;
-}
-
-ssize_t
-xip_file_write(struct file *filp, const char __user *buf, size_t len,
-	       loff_t *ppos)
-{
-	struct address_space *mapping = filp->f_mapping;
-	struct inode *inode = mapping->host;
-	size_t count;
-	loff_t pos;
-	ssize_t ret;
-
-	mutex_lock(&inode->i_mutex);
-
-	if (!access_ok(VERIFY_READ, buf, len)) {
-		ret=-EFAULT;
-		goto out_up;
-	}
-
-	pos = *ppos;
-	count = len;
-
-	/* We can write back this queue in page reclaim */
-	current->backing_dev_info = mapping->backing_dev_info;
-
-	ret = generic_write_checks(filp, &pos, &count, S_ISBLK(inode->i_mode));
-	if (ret)
-		goto out_backing;
-	if (count == 0)
-		goto out_backing;
-
-	ret = file_remove_suid(filp);
-	if (ret)
-		goto out_backing;
-
-	ret = file_update_time(filp);
-	if (ret)
-		goto out_backing;
-
-	ret = __xip_file_write (filp, buf, count, pos, ppos);
-
- out_backing:
-	current->backing_dev_info = NULL;
- out_up:
-	mutex_unlock(&inode->i_mutex);
-	return ret;
-}
-EXPORT_SYMBOL_GPL(xip_file_write);
-
-/*
- * truncate a page used for execute in place
- * functionality is analog to block_truncate_page but does use get_xip_mem
- * to get the page instead of page cache
- */
-int
-xip_truncate_page(struct address_space *mapping, loff_t from)
-{
-	pgoff_t index = from >> PAGE_CACHE_SHIFT;
-	unsigned offset = from & (PAGE_CACHE_SIZE-1);
-	unsigned blocksize;
-	unsigned length;
-	void *xip_mem;
-	unsigned long xip_pfn;
-	int err;
-
-	BUG_ON(!mapping->a_ops->get_xip_mem);
-
-	blocksize = 1 << mapping->host->i_blkbits;
-	length = offset & (blocksize - 1);
-
-	/* Block boundary? Nothing to do */
-	if (!length)
-		return 0;
-
-	length = blocksize - length;
-
-	err = mapping->a_ops->get_xip_mem(mapping, index, 0,
-						&xip_mem, &xip_pfn);
-	if (unlikely(err)) {
-		if (err == -ENODATA)
-			/* Hole? No need to truncate */
-			return 0;
-		else
-			return err;
-	}
-	memset(xip_mem + offset, 0, length);
-	return 0;
-}
-EXPORT_SYMBOL_GPL(xip_truncate_page);