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gfs2: Minor gfs2_page_add_databufs cleanup 

The to parameter of gfs2_page_add_databufs is passed inconsistently:
once as from + len, once as from + len - 1.  Just pass len instead.

In addition, once we're past the end, we can immediately break out of
the loop.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Andreas Gruenbacher 2017-11-06 19:58:36 +01:00 committed by Bob Peterson
parent 235628c5c7
commit 88b65ce5fd
1 changed files with 7 additions and 6 deletions
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13
fs/gfs2/aops.c
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@ -39,18 +39,21 @@
static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
unsigned int from, unsigned int to)
unsigned int from, unsigned int len)
{
struct buffer_head *head = page_buffers(page);
unsigned int bsize = head->b_size;
struct buffer_head *bh;
unsigned int to = from + len;
unsigned int start, end;
for (bh = head, start = 0; bh != head || !start;
bh = bh->b_this_page, start = end) {
end = start + bsize;
if (end <= from || start >= to)
if (end <= from)
continue;
if (start >= to)
break;
if (gfs2_is_jdata(ip))
set_buffer_uptodate(bh);
gfs2_trans_add_data(ip->i_gl, bh);
@ -189,7 +192,7 @@ static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *w
create_empty_buffers(page, inode->i_sb->s_blocksize,
BIT(BH_Dirty)|BIT(BH_Uptodate));
}
gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1);
gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize);
}
return gfs2_write_full_page(page, gfs2_get_block_noalloc, wbc);
}
@ -889,8 +892,6 @@ static int gfs2_write_end(struct file *file, struct address_space *mapping,
struct gfs2_sbd *sdp = GFS2_SB(inode);
struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
struct buffer_head *dibh;
unsigned int from = pos & (PAGE_SIZE - 1);
unsigned int to = from + len;
int ret;
struct gfs2_trans *tr = current->journal_info;
BUG_ON(!tr);
@ -908,7 +909,7 @@ static int gfs2_write_end(struct file *file, struct address_space *mapping,
return gfs2_stuffed_write_end(inode, dibh, pos, len, copied, page);
if (!gfs2_is_writeback(ip))
gfs2_page_add_databufs(ip, page, from, to);
gfs2_page_add_databufs(ip, page, pos & ~PAGE_MASK, len);
ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
if (tr->tr_num_buf_new)