Use the "page has been truncated" logic in page_mkwrite_check_truncate
instead of reimplementing it here.
Signed-off-by: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
Acked-by: David Sterba <dsterba@xxxxxxxx>
---
fs/btrfs/inode.c | 16 +++++-----------
1 file changed, 5 insertions(+), 11 deletions(-)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 5b3ec93ff911..532cc4aa9222 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -8441,16 +8441,15 @@ vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf)
goto out_noreserve;
}
- ret = VM_FAULT_NOPAGE; /* make the VM retry the fault */
again:
lock_page(page);
- size = i_size_read(inode);
- if ((page->mapping != inode->i_mapping) ||
- (page_start >= size)) {
- /* page got truncated out from underneath us */
+ ret2 = page_mkwrite_check_truncate(page, inode);
+ if (ret2 < 0) {
+ ret = block_page_mkwrite_return(ret2);
goto out_unlock;
}
+ zero_start = ret2;
wait_on_page_writeback(page);
lock_extent_bits(io_tree, page_start, page_end, &cached_state);
@@ -8471,6 +8470,7 @@ vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf)
goto again;
}
+ size = i_size_read(inode);
if (page->index == ((size - 1) >> PAGE_SHIFT)) {
reserved_space = round_up(size - page_start,
fs_info->sectorsize);
@@ -8502,12 +8502,6 @@ vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf)
goto out_unlock;
}
- /* page is wholly or partially inside EOF */
- if (page_start + PAGE_SIZE > size)
- zero_start = offset_in_page(size);
- else
- zero_start = PAGE_SIZE;
-
if (zero_start != PAGE_SIZE) {
kaddr = kmap(page);
memset(kaddr + zero_start, 0, PAGE_SIZE - zero_start);
--
2.24.1
