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ext4: move test whether extent to map can be extended to one place

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Currently the logic whether the current buffer can be added to an extent
of buffers to map is split between mpage_add_bh_to_extent() and
add_page_bufs_to_extent(). Move the whole logic to
mpage_add_bh_to_extent() which makes things a bit more straightforward
and make following i_size fixes easier.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@vger.kernel.org
This commit is contained in:
Jan Kara 2013-08-17 09:57:56 -04:00 committed by Theodore Ts'o
parent 7d7345322d
commit 09930042a2
1 changed files with 29 additions and 20 deletions
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49
fs/ext4/inode.c
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@ -1904,34 +1904,48 @@ static int ext4_writepage(struct page *page,
*
* @mpd - extent of blocks
* @lblk - logical number of the block in the file
* @b_state - b_state of the buffer head added
* @bh - buffer head we want to add to the extent
*
* the function is used to collect contig. blocks in same state
* The function is used to collect contig. blocks in the same state. If the
* buffer doesn't require mapping for writeback and we haven't started the
* extent of buffers to map yet, the function returns 'true' immediately - the
* caller can write the buffer right away. Otherwise the function returns true
* if the block has been added to the extent, false if the block couldn't be
* added.
*/
static int mpage_add_bh_to_extent(struct mpage_da_data *mpd, ext4_lblk_t lblk,
unsigned long b_state)
static bool mpage_add_bh_to_extent(struct mpage_da_data *mpd, ext4_lblk_t lblk,
struct buffer_head *bh)
{
struct ext4_map_blocks *map = &mpd->map;
/* Don't go larger than mballoc is willing to allocate */
if (map->m_len >= MAX_WRITEPAGES_EXTENT_LEN)
return 0;
/* Buffer that doesn't need mapping for writeback? */
if (!buffer_dirty(bh) || !buffer_mapped(bh) ||
(!buffer_delay(bh) && !buffer_unwritten(bh))) {
/* So far no extent to map => we write the buffer right away */
if (map->m_len == 0)
return true;
return false;
}
/* First block in the extent? */
if (map->m_len == 0) {
map->m_lblk = lblk;
map->m_len = 1;
map->m_flags = b_state & BH_FLAGS;
return 1;
map->m_flags = bh->b_state & BH_FLAGS;
return true;
}
/* Don't go larger than mballoc is willing to allocate */
if (map->m_len >= MAX_WRITEPAGES_EXTENT_LEN)
return false;
/* Can we merge the block to our big extent? */
if (lblk == map->m_lblk + map->m_len &&
(b_state & BH_FLAGS) == map->m_flags) {
(bh->b_state & BH_FLAGS) == map->m_flags) {
map->m_len++;
return 1;
return true;
}
return 0;
return false;
}
static bool add_page_bufs_to_extent(struct mpage_da_data *mpd,
@ -1946,18 +1960,13 @@ static bool add_page_bufs_to_extent(struct mpage_da_data *mpd,
do {
BUG_ON(buffer_locked(bh));
if (!buffer_dirty(bh) || !buffer_mapped(bh) ||
(!buffer_delay(bh) && !buffer_unwritten(bh)) ||
lblk >= blocks) {
if (lblk >= blocks || !mpage_add_bh_to_extent(mpd, lblk, bh)) {
/* Found extent to map? */
if (mpd->map.m_len)
return false;
if (lblk >= blocks)
return true;
continue;
/* Everything mapped so far and we hit EOF */
return true;
}
if (!mpage_add_bh_to_extent(mpd, lblk, bh->b_state))
return false;
} while (lblk++, (bh = bh->b_this_page) != head);
return true;
}