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authorRyan Ding <ryan.ding@oracle.com>2016-03-25 14:21:01 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-03-25 16:37:42 -0700
commit46e625565950c5f31a193c4bbcfdef3fdc7235bf (patch)
tree6c3c4004327a03b0df445a602d2ca55c86c00568
parent65c4db8c8282cd239f0ba3226cfe59cc9768193c (diff)
downloadlinux-sh-46e625565950c5f31a193c4bbcfdef3fdc7235bf.tar.gz
ocfs2: do not change i_size in write_end for direct io
To support direct io in ocfs2_write_begin_nolock & ocfs2_write_end_nolock. Append direct io do not change i_size in get block phase. It only move to orphan when starting write. After data is written to disk, it will delete itself from orphan and update i_size. So skip i_size change section in write_begin for direct io. And when there is no extents alloc, no meta data changes needed for direct io (since write_begin start trans for 2 reason: alloc extents & change i_size. Now none of them needed). So we can skip start trans procedure. Signed-off-by: Ryan Ding <ryan.ding@oracle.com> Reviewed-by: Junxiao Bi <junxiao.bi@oracle.com> Cc: Joseph Qi <joseph.qi@huawei.com> Cc: Mark Fasheh <mfasheh@suse.de> Cc: Joel Becker <jlbec@evilplan.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/ocfs2/aops.c79
1 files changed, 46 insertions, 33 deletions
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 100f7a8a0de1..4ad77453438a 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -2043,8 +2043,10 @@ static int ocfs2_expand_nonsparse_inode(struct inode *inode,
if (ret)
mlog_errno(ret);
- wc->w_first_new_cpos =
- ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode));
+ /* There is no wc if this is call from direct. */
+ if (wc)
+ wc->w_first_new_cpos =
+ ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode));
return ret;
}
@@ -2135,14 +2137,17 @@ try_again:
}
}
- if (ocfs2_sparse_alloc(osb))
- ret = ocfs2_zero_tail(inode, di_bh, pos);
- else
- ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos, len,
- wc);
- if (ret) {
- mlog_errno(ret);
- goto out;
+ /* Direct io change i_size late, should not zero tail here. */
+ if (type != OCFS2_WRITE_DIRECT) {
+ if (ocfs2_sparse_alloc(osb))
+ ret = ocfs2_zero_tail(inode, di_bh, pos);
+ else
+ ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos,
+ len, wc);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
}
ret = ocfs2_check_range_for_refcount(inode, pos, len);
@@ -2203,8 +2208,9 @@ try_again:
credits = ocfs2_calc_extend_credits(inode->i_sb,
&di->id2.i_list);
-
- }
+ } else if (type == OCFS2_WRITE_DIRECT)
+ /* direct write needs not to start trans if no extents alloc. */
+ goto success;
/*
* We have to zero sparse allocated clusters, unwritten extent clusters,
@@ -2402,12 +2408,14 @@ int ocfs2_write_end_nolock(struct address_space *mapping,
handle_t *handle = wc->w_handle;
struct page *tmppage;
- ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh,
- OCFS2_JOURNAL_ACCESS_WRITE);
- if (ret) {
- copied = ret;
- mlog_errno(ret);
- goto out;
+ if (handle) {
+ ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
+ wc->w_di_bh, OCFS2_JOURNAL_ACCESS_WRITE);
+ if (ret) {
+ copied = ret;
+ mlog_errno(ret);
+ goto out;
+ }
}
if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
@@ -2450,25 +2458,29 @@ int ocfs2_write_end_nolock(struct address_space *mapping,
}
if (page_has_buffers(tmppage)) {
- if (ocfs2_should_order_data(inode))
- ocfs2_jbd2_file_inode(wc->w_handle, inode);
+ if (handle && ocfs2_should_order_data(inode))
+ ocfs2_jbd2_file_inode(handle, inode);
block_commit_write(tmppage, from, to);
}
}
out_write_size:
- pos += copied;
- if (pos > i_size_read(inode)) {
- i_size_write(inode, pos);
- mark_inode_dirty(inode);
- }
- inode->i_blocks = ocfs2_inode_sector_count(inode);
- di->i_size = cpu_to_le64((u64)i_size_read(inode));
- inode->i_mtime = inode->i_ctime = CURRENT_TIME;
- di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
- di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
- ocfs2_update_inode_fsync_trans(handle, inode, 1);
- ocfs2_journal_dirty(handle, wc->w_di_bh);
+ /* Direct io do not update i_size here. */
+ if (wc->w_type != OCFS2_WRITE_DIRECT) {
+ pos += copied;
+ if (pos > i_size_read(inode)) {
+ i_size_write(inode, pos);
+ mark_inode_dirty(inode);
+ }
+ inode->i_blocks = ocfs2_inode_sector_count(inode);
+ di->i_size = cpu_to_le64((u64)i_size_read(inode));
+ inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+ di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
+ di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
+ ocfs2_update_inode_fsync_trans(handle, inode, 1);
+ }
+ if (handle)
+ ocfs2_journal_dirty(handle, wc->w_di_bh);
out:
/* unlock pages before dealloc since it needs acquiring j_trans_barrier
@@ -2478,7 +2490,8 @@ out:
*/
ocfs2_unlock_pages(wc);
- ocfs2_commit_trans(osb, handle);
+ if (handle)
+ ocfs2_commit_trans(osb, handle);
ocfs2_run_deallocs(osb, &wc->w_dealloc);