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-rw-r--r--fs/buffer.c2
-rw-r--r--fs/ext4/inode.c2
-rw-r--r--fs/gfs2/file.c2
-rw-r--r--fs/nilfs2/file.c2
-rw-r--r--include/linux/pagemap.h1
-rw-r--r--mm/filemap.c3
-rw-r--r--mm/page-writeback.c20
7 files changed, 27 insertions, 5 deletions
diff --git a/fs/buffer.c b/fs/buffer.c
index 7a75c3e..2ea9cd44 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2359,7 +2359,7 @@ int __block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
if (unlikely(ret < 0))
goto out_unlock;
set_page_dirty(page);
- wait_on_page_writeback(page);
+ wait_for_stable_page(page);
return 0;
out_unlock:
unlock_page(page);
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index cbfe13b..cd818d8b 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4968,7 +4968,7 @@ int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
0, len, NULL,
ext4_bh_unmapped)) {
/* Wait so that we don't change page under IO */
- wait_on_page_writeback(page);
+ wait_for_stable_page(page);
ret = VM_FAULT_LOCKED;
goto out;
}
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 06b7092..2687f50d 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -483,7 +483,7 @@ out:
gfs2_holder_uninit(&gh);
if (ret == 0) {
set_page_dirty(page);
- wait_on_page_writeback(page);
+ wait_for_stable_page(page);
}
sb_end_pagefault(inode->i_sb);
return block_page_mkwrite_return(ret);
diff --git a/fs/nilfs2/file.c b/fs/nilfs2/file.c
index 6194688..bec4af6 100644
--- a/fs/nilfs2/file.c
+++ b/fs/nilfs2/file.c
@@ -126,7 +126,7 @@ static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
nilfs_transaction_commit(inode->i_sb);
mapped:
- wait_on_page_writeback(page);
+ wait_for_stable_page(page);
out:
sb_end_pagefault(inode->i_sb);
return block_page_mkwrite_return(ret);
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 6da609d..0e38e13 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -414,6 +414,7 @@ static inline void wait_on_page_writeback(struct page *page)
}
extern void end_page_writeback(struct page *page);
+void wait_for_stable_page(struct page *page);
/*
* Add an arbitrary waiter to a page's wait queue
diff --git a/mm/filemap.c b/mm/filemap.c
index 24a7ea5..c610076 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1728,6 +1728,7 @@ int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
* see the dirty page and writeprotect it again.
*/
set_page_dirty(page);
+ wait_for_stable_page(page);
out:
sb_end_pagefault(inode->i_sb);
return ret;
@@ -2274,7 +2275,7 @@ repeat:
return NULL;
}
found:
- wait_on_page_writeback(page);
+ wait_for_stable_page(page);
return page;
}
EXPORT_SYMBOL(grab_cache_page_write_begin);
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 66a0024..355d5ee 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2290,3 +2290,23 @@ int mapping_tagged(struct address_space *mapping, int tag)
return radix_tree_tagged(&mapping->page_tree, tag);
}
EXPORT_SYMBOL(mapping_tagged);
+
+/**
+ * wait_for_stable_page() - wait for writeback to finish, if necessary.
+ * @page: The page to wait on.
+ *
+ * This function determines if the given page is related to a backing device
+ * that requires page contents to be held stable during writeback. If so, then
+ * it will wait for any pending writeback to complete.
+ */
+void wait_for_stable_page(struct page *page)
+{
+ struct address_space *mapping = page_mapping(page);
+ struct backing_dev_info *bdi = mapping->backing_dev_info;
+
+ if (!bdi_cap_stable_pages_required(bdi))
+ return;
+
+ wait_on_page_writeback(page);
+}
+EXPORT_SYMBOL_GPL(wait_for_stable_page);
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