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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>
hifive-unleashed-5.1
Ryan Ding 2016-03-25 14:21:01 -07:00 committed by Linus Torvalds
parent 65c4db8c82
commit 46e6255659
1 changed files with 45 additions and 32 deletions
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77
fs/ocfs2/aops.c
View File

@ -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);
/* 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);
}
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);
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);