mm: implement ->map_pages for page cache

filemap_map_pages() is generic implementation of ->map_pages() for
filesystems who uses page cache.

It should be safe to use filemap_map_pages() for ->map_pages() if
filesystem use filemap_fault() for ->fault().

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Ning Qu <quning@gmail.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index a16b0ff..d822320 100644 (file)
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -832,6 +832,7 @@ static void v9fs_mmap_vm_close(struct vm_area_struct *vma)
 
 static const struct vm_operations_struct v9fs_file_vm_ops = {
        .fault = filemap_fault,
+       .map_pages = filemap_map_pages,
        .page_mkwrite = v9fs_vm_page_mkwrite,
        .remap_pages = generic_file_remap_pages,
 };
@@ -839,6 +840,7 @@ static const struct vm_operations_struct v9fs_file_vm_ops = {
 static const struct vm_operations_struct v9fs_mmap_file_vm_ops = {
        .close = v9fs_mmap_vm_close,
        .fault = filemap_fault,
+       .map_pages = filemap_map_pages,
        .page_mkwrite = v9fs_vm_page_mkwrite,
        .remap_pages = generic_file_remap_pages,
 };

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index e1ffb1e..c660527 100644 (file)
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -2025,6 +2025,7 @@ out:
 
 static const struct vm_operations_struct btrfs_file_vm_ops = {
        .fault          = filemap_fault,
+       .map_pages      = filemap_map_pages,
        .page_mkwrite   = btrfs_page_mkwrite,
        .remap_pages    = generic_file_remap_pages,
 };

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 834fce7..216d7e9 100644 (file)
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -3113,6 +3113,7 @@ cifs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 
 static struct vm_operations_struct cifs_file_vm_ops = {
        .fault = filemap_fault,
+       .map_pages = filemap_map_pages,
        .page_mkwrite = cifs_page_mkwrite,
        .remap_pages = generic_file_remap_pages,
 };

diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 6db7f7d..4e508fc 100644 (file)
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -200,6 +200,7 @@ ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
 
 static const struct vm_operations_struct ext4_file_vm_ops = {
        .fault          = filemap_fault,
+       .map_pages      = filemap_map_pages,
        .page_mkwrite   = ext4_page_mkwrite,
        .remap_pages    = generic_file_remap_pages,
 };

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 0dfcef5..129a3bd 100644 (file)
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -84,6 +84,7 @@ out:
 
 static const struct vm_operations_struct f2fs_file_vm_ops = {
        .fault          = filemap_fault,
+       .map_pages      = filemap_map_pages,
        .page_mkwrite   = f2fs_vm_page_mkwrite,
        .remap_pages    = generic_file_remap_pages,
 };

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 65df7d8..48992ca 100644 (file)
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -2117,6 +2117,7 @@ static int fuse_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 static const struct vm_operations_struct fuse_file_vm_ops = {
        .close          = fuse_vma_close,
        .fault          = filemap_fault,
+       .map_pages      = filemap_map_pages,
        .page_mkwrite   = fuse_page_mkwrite,
        .remap_pages    = generic_file_remap_pages,
 };

diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 6c79408..80d6725 100644 (file)
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -494,6 +494,7 @@ out:
 
 static const struct vm_operations_struct gfs2_vm_ops = {
        .fault = filemap_fault,
+       .map_pages = filemap_map_pages,
        .page_mkwrite = gfs2_page_mkwrite,
        .remap_pages = generic_file_remap_pages,
 };

diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 5bb790a..284ca90 100644 (file)
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -617,6 +617,7 @@ out:
 
 static const struct vm_operations_struct nfs_file_vm_ops = {
        .fault = filemap_fault,
+       .map_pages = filemap_map_pages,
        .page_mkwrite = nfs_vm_page_mkwrite,
        .remap_pages = generic_file_remap_pages,
 };

diff --git a/fs/nilfs2/file.c b/fs/nilfs2/file.c
index 08fdb77..f3a82fb 100644 (file)
--- a/fs/nilfs2/file.c
+++ b/fs/nilfs2/file.c
@@ -134,6 +134,7 @@ static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 
 static const struct vm_operations_struct nilfs_file_vm_ops = {
        .fault          = filemap_fault,
+       .map_pages      = filemap_map_pages,
        .page_mkwrite   = nilfs_page_mkwrite,
        .remap_pages    = generic_file_remap_pages,
 };

diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index 123c79b..4f34dba 100644 (file)
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -1538,6 +1538,7 @@ out_unlock:
 
 static const struct vm_operations_struct ubifs_file_vm_ops = {
        .fault        = filemap_fault,
+       .map_pages = filemap_map_pages,
        .page_mkwrite = ubifs_vm_page_mkwrite,
        .remap_pages = generic_file_remap_pages,
 };

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index f7abff8..003c005 100644 (file)
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -1483,6 +1483,7 @@ const struct file_operations xfs_dir_file_operations = {
 
 static const struct vm_operations_struct xfs_file_vm_ops = {
        .fault          = filemap_fault,
+       .map_pages      = filemap_map_pages,
        .page_mkwrite   = xfs_vm_page_mkwrite,
        .remap_pages    = generic_file_remap_pages,
 };

diff --git a/include/linux/mm.h b/include/linux/mm.h
index f710d32..9132fae 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1847,6 +1847,7 @@ extern void truncate_inode_pages_final(struct address_space *);
 
 /* generic vm_area_ops exported for stackable file systems */
 extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
+extern void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf);
 extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
 
 /* mm/page-writeback.c */

diff --git a/mm/filemap.c b/mm/filemap.c
index 21781f1..3f9b5fb 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -33,6 +33,7 @@
 #include <linux/hardirq.h> /* for BUG_ON(!in_atomic()) only */
 #include <linux/memcontrol.h>
 #include <linux/cleancache.h>
+#include <linux/rmap.h>
 #include "internal.h"
 
 #define CREATE_TRACE_POINTS
@@ -2064,6 +2065,78 @@ page_not_uptodate:
 }
 EXPORT_SYMBOL(filemap_fault);
 
+void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+       struct radix_tree_iter iter;
+       void **slot;
+       struct file *file = vma->vm_file;
+       struct address_space *mapping = file->f_mapping;
+       loff_t size;
+       struct page *page;
+       unsigned long address = (unsigned long) vmf->virtual_address;
+       unsigned long addr;
+       pte_t *pte;
+
+       rcu_read_lock();
+       radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, vmf->pgoff) {
+               if (iter.index > vmf->max_pgoff)
+                       break;
+repeat:
+               page = radix_tree_deref_slot(slot);
+               if (unlikely(!page))
+                       goto next;
+               if (radix_tree_exception(page)) {
+                       if (radix_tree_deref_retry(page))
+                               break;
+                       else
+                               goto next;
+               }
+
+               if (!page_cache_get_speculative(page))
+                       goto repeat;
+
+               /* Has the page moved? */
+               if (unlikely(page != *slot)) {
+                       page_cache_release(page);
+                       goto repeat;
+               }
+
+               if (!PageUptodate(page) ||
+                               PageReadahead(page) ||
+                               PageHWPoison(page))
+                       goto skip;
+               if (!trylock_page(page))
+                       goto skip;
+
+               if (page->mapping != mapping || !PageUptodate(page))
+                       goto unlock;
+
+               size = i_size_read(mapping->host) + PAGE_CACHE_SIZE - 1;
+               if (page->index >= size >> PAGE_CACHE_SHIFT)
+                       goto unlock;
+
+               pte = vmf->pte + page->index - vmf->pgoff;
+               if (!pte_none(*pte))
+                       goto unlock;
+
+               if (file->f_ra.mmap_miss > 0)
+                       file->f_ra.mmap_miss--;
+               addr = address + (page->index - vmf->pgoff) * PAGE_SIZE;
+               do_set_pte(vma, addr, page, pte, false, false);
+               unlock_page(page);
+               goto next;
+unlock:
+               unlock_page(page);
+skip:
+               page_cache_release(page);
+next:
+               if (iter.index == vmf->max_pgoff)
+                       break;
+       }
+       rcu_read_unlock();
+}
+EXPORT_SYMBOL(filemap_map_pages);
+
 int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
        struct page *page = vmf->page;
@@ -2093,6 +2166,7 @@ EXPORT_SYMBOL(filemap_page_mkwrite);
 
 const struct vm_operations_struct generic_file_vm_ops = {
        .fault          = filemap_fault,
+       .map_pages      = filemap_map_pages,
        .page_mkwrite   = filemap_page_mkwrite,
        .remap_pages    = generic_file_remap_pages,
 };

diff --git a/mm/nommu.c b/mm/nommu.c
index a554e5a..e194825 100644 (file)
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1985,6 +1985,12 @@ int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 }
 EXPORT_SYMBOL(filemap_fault);
 
+void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+       BUG();
+}
+EXPORT_SYMBOL(filemap_map_pages);
+
 int generic_file_remap_pages(struct vm_area_struct *vma, unsigned long addr,
                             unsigned long size, pgoff_t pgoff)
 {