ocfs2: teach extend/truncate about sparse files
For ocfs2_truncate_file(), we eliminate the "simple" truncate case which no
longer exists since i_size is not tied to i_clusters. In
ocfs2_extend_file(), we skip the allocation / page zeroing code for file
systems which understand sparse files.
The core truncate code is changed to do a bottom up tree traversal. This
gets abstracted out into it's own function. To make things more readable,
most of the special case handling for in-inode extents from
ocfs2_do_truncate() is also removed.
Though write support for sparse files comes in a later patch, we at least
update ocfs2_prepare_inode_for_write() to skip allocation for sparse files.
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index 5ff8549..0bd86a1 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -487,7 +487,6 @@
struct buffer_head *fe_bh)
{
int status = 0;
- handle_t *handle = NULL;
struct ocfs2_truncate_context *tc = NULL;
struct ocfs2_dinode *fe;
@@ -495,41 +494,20 @@
fe = (struct ocfs2_dinode *) fe_bh->b_data;
- /* zero allocation, zero truncate :) */
- if (!fe->i_clusters)
- goto bail;
+ if (fe->i_clusters) {
+ status = ocfs2_prepare_truncate(osb, inode, fe_bh, &tc);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out;
+ }
- handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
- if (IS_ERR(handle)) {
- status = PTR_ERR(handle);
- handle = NULL;
- mlog_errno(status);
- goto bail;
+ status = ocfs2_commit_truncate(osb, inode, fe_bh, tc);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out;
+ }
}
-
- status = ocfs2_set_inode_size(handle, inode, fe_bh, 0ULL);
- if (status < 0) {
- mlog_errno(status);
- goto bail;
- }
-
- ocfs2_commit_trans(osb, handle);
- handle = NULL;
-
- status = ocfs2_prepare_truncate(osb, inode, fe_bh, &tc);
- if (status < 0) {
- mlog_errno(status);
- goto bail;
- }
-
- status = ocfs2_commit_truncate(osb, inode, fe_bh, tc);
- if (status < 0) {
- mlog_errno(status);
- goto bail;
- }
-bail:
- if (handle)
- ocfs2_commit_trans(osb, handle);
+out:
mlog_exit(status);
return status;