dax,ext2: replace the XIP page fault handler with the DAX page fault handler

Instead of calling aops->get_xip_mem from the fault handler, the
filesystem passes a get_block_t that is used to find the appropriate
blocks.

This requires that all architectures implement copy_user_page().  At the
time of writing, mips and arm do not.  Patches exist and are in progress.

[akpm@linux-foundation.org: remap_file_pages went away]
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Andreas Dilger <andreas.dilger@intel.com>
Cc: Boaz Harrosh <boaz@plexistor.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 241 insertions, 0 deletions

diff --git a/fs/dax.c b/fs/dax.c
index 69c3126a05b4..553e55b93495 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -19,9 +19,13 @@
 #include <linux/buffer_head.h>
 #include <linux/fs.h>
 #include <linux/genhd.h>
+#include <linux/highmem.h>
+#include <linux/memcontrol.h>
+#include <linux/mm.h>
 #include <linux/mutex.h>
 #include <linux/sched.h>
 #include <linux/uio.h>
+#include <linux/vmstat.h>
 
 int dax_clear_blocks(struct inode *inode, sector_t block, long size)
 {
@@ -221,3 +225,240 @@ ssize_t dax_do_io(int rw, struct kiocb *iocb, struct inode *inode,
         return retval;
 }
 EXPORT_SYMBOL_GPL(dax_do_io);
+
+/*
+ * The user has performed a load from a hole in the file.  Allocating
+ * a new page in the file would cause excessive storage usage for
+ * workloads with sparse files.  We allocate a page cache page instead.
+ * We'll kick it out of the page cache if it's ever written to,
+ * otherwise it will simply fall out of the page cache under memory
+ * pressure without ever having been dirtied.
+ */
+static int dax_load_hole(struct address_space *mapping, struct page *page,
+                                                        struct vm_fault *vmf)
+{
+        unsigned long size;
+        struct inode *inode = mapping->host;
+        if (!page)
+                page = find_or_create_page(mapping, vmf->pgoff,
+                                                GFP_KERNEL | __GFP_ZERO);
+        if (!page)
+                return VM_FAULT_OOM;
+        /* Recheck i_size under page lock to avoid truncate race */
+        size = (i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT;
+        if (vmf->pgoff >= size) {
+                unlock_page(page);
+                page_cache_release(page);
+                return VM_FAULT_SIGBUS;
+        }
+
+        vmf->page = page;
+        return VM_FAULT_LOCKED;
+}
+
+static int copy_user_bh(struct page *to, struct buffer_head *bh,
+                        unsigned blkbits, unsigned long vaddr)
+{
+        void *vfrom, *vto;
+        if (dax_get_addr(bh, &vfrom, blkbits) < 0)
+                return -EIO;
+        vto = kmap_atomic(to);
+        copy_user_page(vto, vfrom, vaddr, to);
+        kunmap_atomic(vto);
+        return 0;
+}
+
+static int dax_insert_mapping(struct inode *inode, struct buffer_head *bh,
+                        struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+        struct address_space *mapping = inode->i_mapping;
+        sector_t sector = bh->b_blocknr << (inode->i_blkbits - 9);
+        unsigned long vaddr = (unsigned long)vmf->virtual_address;
+        void *addr;
+        unsigned long pfn;
+        pgoff_t size;
+        int error;
+
+        i_mmap_lock_read(mapping);
+
+        /*
+         * Check truncate didn't happen while we were allocating a block.
+         * If it did, this block may or may not be still allocated to the
+         * file.  We can't tell the filesystem to free it because we can't
+         * take i_mutex here.  In the worst case, the file still has blocks
+         * allocated past the end of the file.
+         */
+        size = (i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT;
+        if (unlikely(vmf->pgoff >= size)) {
+                error = -EIO;
+                goto out;
+        }
+
+        error = bdev_direct_access(bh->b_bdev, sector, &addr, &pfn, bh->b_size);
+        if (error < 0)
+                goto out;
+        if (error < PAGE_SIZE) {
+                error = -EIO;
+                goto out;
+        }
+
+        if (buffer_unwritten(bh) || buffer_new(bh))
+                clear_page(addr);
+
+        error = vm_insert_mixed(vma, vaddr, pfn);
+
+ out:
+        i_mmap_unlock_read(mapping);
+
+        if (bh->b_end_io)
+                bh->b_end_io(bh, 1);
+
+        return error;
+}
+
+static int do_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf,
+                        get_block_t get_block)
+{
+        struct file *file = vma->vm_file;
+        struct address_space *mapping = file->f_mapping;
+        struct inode *inode = mapping->host;
+        struct page *page;
+        struct buffer_head bh;
+        unsigned long vaddr = (unsigned long)vmf->virtual_address;
+        unsigned blkbits = inode->i_blkbits;
+        sector_t block;
+        pgoff_t size;
+        int error;
+        int major = 0;
+
+        size = (i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT;
+        if (vmf->pgoff >= size)
+                return VM_FAULT_SIGBUS;
+
+        memset(&bh, 0, sizeof(bh));
+        block = (sector_t)vmf->pgoff << (PAGE_SHIFT - blkbits);
+        bh.b_size = PAGE_SIZE;
+
+ repeat:
+        page = find_get_page(mapping, vmf->pgoff);
+        if (page) {
+                if (!lock_page_or_retry(page, vma->vm_mm, vmf->flags)) {
+                        page_cache_release(page);
+                        return VM_FAULT_RETRY;
+                }
+                if (unlikely(page->mapping != mapping)) {
+                        unlock_page(page);
+                        page_cache_release(page);
+                        goto repeat;
+                }
+                size = (i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT;
+                if (unlikely(vmf->pgoff >= size)) {
+                        /*
+                         * We have a struct page covering a hole in the file
+                         * from a read fault and we've raced with a truncate
+                         */
+                        error = -EIO;
+                        goto unlock_page;
+                }
+        }
+
+        error = get_block(inode, block, &bh, 0);
+        if (!error && (bh.b_size < PAGE_SIZE))
+                error = -EIO;           /* fs corruption? */
+        if (error)
+                goto unlock_page;
+
+        if (!buffer_mapped(&bh) && !buffer_unwritten(&bh) && !vmf->cow_page) {
+                if (vmf->flags & FAULT_FLAG_WRITE) {
+                        error = get_block(inode, block, &bh, 1);
+                        count_vm_event(PGMAJFAULT);
+                        mem_cgroup_count_vm_event(vma->vm_mm, PGMAJFAULT);
+                        major = VM_FAULT_MAJOR;
+                        if (!error && (bh.b_size < PAGE_SIZE))
+                                error = -EIO;
+                        if (error)
+                                goto unlock_page;
+                } else {
+                        return dax_load_hole(mapping, page, vmf);
+                }
+        }
+
+        if (vmf->cow_page) {
+                struct page *new_page = vmf->cow_page;
+                if (buffer_written(&bh))
+                        error = copy_user_bh(new_page, &bh, blkbits, vaddr);
+                else
+                        clear_user_highpage(new_page, vaddr);
+                if (error)
+                        goto unlock_page;
+                vmf->page = page;
+                if (!page) {
+                        i_mmap_lock_read(mapping);
+                        /* Check we didn't race with truncate */
+                        size = (i_size_read(inode) + PAGE_SIZE - 1) >>
+                                                                PAGE_SHIFT;
+                        if (vmf->pgoff >= size) {
+                                i_mmap_unlock_read(mapping);
+                                error = -EIO;
+                                goto out;
+                        }
+                }
+                return VM_FAULT_LOCKED;
+        }
+
+        /* Check we didn't race with a read fault installing a new page */
+        if (!page && major)
+                page = find_lock_page(mapping, vmf->pgoff);
+
+        if (page) {
+                unmap_mapping_range(mapping, vmf->pgoff << PAGE_SHIFT,
+                                                        PAGE_CACHE_SIZE, 0);
+                delete_from_page_cache(page);
+                unlock_page(page);
+                page_cache_release(page);
+        }
+
+        error = dax_insert_mapping(inode, &bh, vma, vmf);
+
+ out:
+        if (error == -ENOMEM)
+                return VM_FAULT_OOM | major;
+        /* -EBUSY is fine, somebody else faulted on the same PTE */
+        if ((error < 0) && (error != -EBUSY))
+                return VM_FAULT_SIGBUS | major;
+        return VM_FAULT_NOPAGE | major;
+
+ unlock_page:
+        if (page) {
+                unlock_page(page);
+                page_cache_release(page);
+        }
+        goto out;
+}
+
+/**
+ * dax_fault - handle a page fault on a DAX file
+ * @vma: The virtual memory area where the fault occurred
+ * @vmf: The description of the fault
+ * @get_block: The filesystem method used to translate file offsets to blocks
+ *
+ * When a page fault occurs, filesystems may call this helper in their
+ * fault handler for DAX files.
+ */
+int dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf,
+                        get_block_t get_block)
+{
+        int result;
+        struct super_block *sb = file_inode(vma->vm_file)->i_sb;
+
+        if (vmf->flags & FAULT_FLAG_WRITE) {
+                sb_start_pagefault(sb);
+                file_update_time(vma->vm_file);
+        }
+        result = do_dax_fault(vma, vmf, get_block);
+        if (vmf->flags & FAULT_FLAG_WRITE)
+                sb_end_pagefault(sb);
+
+        return result;
+}
+EXPORT_SYMBOL_GPL(dax_fault);