lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

ocfs2: teach extend/truncate about sparse files

Browse Source 
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>
This commit is contained in:
Mark Fasheh
2007-01-17 12:53:31 -08:00
parent 363041a5f7
commit 3a0782d09c
3 changed files with 320 additions and 237 deletions
Download Patch File Download Diff File Expand all files Collapse all files

46
fs/ocfs2/inode.c
View File

@ -487,7 +487,6 @@ static int ocfs2_truncate_for_delete(struct ocfs2_super *osb,
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 @@ static int ocfs2_truncate_for_delete(struct ocfs2_super *osb,
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;