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ext4: let ext4 maintain extent status tree

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This patch lets ext4 maintain extent status tree.

Currently it only tracks delay extent status in extent status tree.  When a
delay allocation is issued, the related delay extent will be inserted into
extent status tree.  When a delay extent is written out or invalidated, it will
be removed from this tree.

Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: Allison Henderson <achender@linux.vnet.ibm.com>
Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Zheng Liu
2012-11-08 21:57:32 -05:00
committed by Theodore Ts'o
parent 9a26b66175
commit 51865fda28
4 changed files with 51 additions and 4 deletions
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38
fs/ext4/inode.c
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@@ -574,7 +574,16 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
up_read((&EXT4_I(inode)->i_data_sem));
if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) {
int ret = check_block_validity(inode, map);
int ret;
if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) {
/* delayed alloc may be allocated by fallocate and
* coverted to initialized by directIO.
* we need to handle delayed extent here.
*/
down_write((&EXT4_I(inode)->i_data_sem));
goto delayed_mapped;
}
ret = check_block_validity(inode, map);
if (ret != 0)
return ret;
}
@@ -656,8 +665,16 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
* set the BH_Da_Mapped bit on them. Its important to do this
* under the protection of i_data_sem.
*/
if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED)
if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) {
int ret;
set_buffers_da_mapped(inode, map);
delayed_mapped:
/* delayed allocation blocks has been allocated */
ret = ext4_es_remove_extent(inode, map->m_lblk,
map->m_len);
if (ret < 0)
retval = ret;
}
}
up_write((&EXT4_I(inode)->i_data_sem));
@@ -1303,6 +1320,7 @@ static void ext4_da_page_release_reservation(struct page *page,
struct inode *inode = page->mapping->host;
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
int num_clusters;
ext4_fsblk_t lblk;
head = page_buffers(page);
bh = head;
@@ -1317,11 +1335,15 @@ static void ext4_da_page_release_reservation(struct page *page,
curr_off = next_off;
} while ((bh = bh->b_this_page) != head);
if (to_release) {
lblk = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
ext4_es_remove_extent(inode, lblk, to_release);
}
/* If we have released all the blocks belonging to a cluster, then we
* need to release the reserved space for that cluster. */
num_clusters = EXT4_NUM_B2C(sbi, to_release);
while (num_clusters > 0) {
ext4_fsblk_t lblk;
lblk = (page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits)) +
((num_clusters - 1) << sbi->s_cluster_bits);
if (sbi->s_cluster_ratio == 1 ||
@@ -1502,9 +1524,15 @@ static void ext4_da_block_invalidatepages(struct mpage_da_data *mpd)
struct pagevec pvec;
struct inode *inode = mpd->inode;
struct address_space *mapping = inode->i_mapping;
ext4_lblk_t start, last;
index = mpd->first_page;
end = mpd->next_page - 1;
start = index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
last = end << (PAGE_CACHE_SHIFT - inode->i_blkbits);
ext4_es_remove_extent(inode, start, last - start + 1);
while (index <= end) {
nr_pages = pagevec_lookup(&pvec, mapping, index, PAGEVEC_SIZE);
if (nr_pages == 0)
@@ -1816,6 +1844,10 @@ static int ext4_da_map_blocks(struct inode *inode, sector_t iblock,
goto out_unlock;
}
retval = ext4_es_insert_extent(inode, map->m_lblk, map->m_len);
if (retval)
goto out_unlock;
/* Clear EXT4_MAP_FROM_CLUSTER flag since its purpose is served
* and it should not appear on the bh->b_state.
*/