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Diffstat (limited to 'mm/filemap.c')
-rw-r--r--mm/filemap.c31
1 files changed, 29 insertions, 2 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index a4a5260b0279..fa5ca304148e 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1712,8 +1712,35 @@ page_not_uptodate:
}
EXPORT_SYMBOL(filemap_fault);
+int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+ struct page *page = vmf->page;
+ struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
+ int ret = VM_FAULT_LOCKED;
+
+ sb_start_pagefault(inode->i_sb);
+ file_update_time(vma->vm_file);
+ lock_page(page);
+ if (page->mapping != inode->i_mapping) {
+ unlock_page(page);
+ ret = VM_FAULT_NOPAGE;
+ goto out;
+ }
+ /*
+ * We mark the page dirty already here so that when freeze is in
+ * progress, we are guaranteed that writeback during freezing will
+ * see the dirty page and writeprotect it again.
+ */
+ set_page_dirty(page);
+out:
+ sb_end_pagefault(inode->i_sb);
+ return ret;
+}
+EXPORT_SYMBOL(filemap_page_mkwrite);
+
const struct vm_operations_struct generic_file_vm_ops = {
.fault = filemap_fault,
+ .page_mkwrite = filemap_page_mkwrite,
};
/* This is used for a general mmap of a disk file */
@@ -2407,8 +2434,6 @@ ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
count = ocount;
pos = *ppos;
- vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
-
/* We can write back this queue in page reclaim */
current->backing_dev_info = mapping->backing_dev_info;
written = 0;
@@ -2507,6 +2532,7 @@ ssize_t generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
BUG_ON(iocb->ki_pos != pos);
+ sb_start_write(inode->i_sb);
mutex_lock(&inode->i_mutex);
blk_start_plug(&plug);
ret = __generic_file_aio_write(iocb, iov, nr_segs, &iocb->ki_pos);
@@ -2520,6 +2546,7 @@ ssize_t generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
ret = err;
}
blk_finish_plug(&plug);
+ sb_end_write(inode->i_sb);
return ret;
}
EXPORT_SYMBOL(generic_file_aio_write);