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Message-Id: <1358942640-2262-6-git-send-email-wenqing.lz@taobao.com>
Date: Wed, 23 Jan 2013 20:03:55 +0800
From: Zheng Liu <gnehzuil.liu@...il.com>
To: linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc: Zheng Liu <wenqing.lz@...bao.com>, "Theodore Ts'o" <tytso@....edu>
Subject: [PATCH 05/10 v3] ext4: track all extent status in extent status tree
From: Zheng Liu <wenqing.lz@...bao.com>
By recording the phycisal block and status, extent status tree is able
to track the status of every extents. When we call _map_blocks
functions to lookup an extent or create a new written/unwritten/delayed
extent, this extent will be inserted into extent status tree.
We don't load all extents from disk in alloc_inode() because it costs
too much memory, and if a file is opened and closed frequently it will
takes too much time to load all extent information. So currently when
we create/lookup an extent, this extent will be inserted into extent
status tree. Hence, the extent status tree may not comprehensively
contain all of the extents found in the file.
Signed-off-by: Zheng Liu <wenqing.lz@...bao.com>
Cc: "Theodore Ts'o" <tytso@....edu>
---
fs/ext4/extents.c | 5 +++-
fs/ext4/file.c | 6 +++--
fs/ext4/inode.c | 73 ++++++++++++++++++++++++++++++++++++-------------------
3 files changed, 56 insertions(+), 28 deletions(-)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index aa9a6d2..d23a654 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -2074,7 +2074,7 @@ static int ext4_fill_fiemap_extents(struct inode *inode,
}
/* This is possible iff next == next_del == EXT_MAX_BLOCKS */
- if (next == next_del) {
+ if (next == next_del && next_del == EXT_MAX_BLOCKS) {
flags |= FIEMAP_EXTENT_LAST;
if (unlikely(next_del != EXT_MAX_BLOCKS ||
next != EXT_MAX_BLOCKS)) {
@@ -4570,6 +4570,9 @@ static int ext4_find_delayed_extent(struct inode *inode,
/* A hole found. */
return 0;
+ if (!ext4_es_is_delayed(&es))
+ return 0;
+
if (es.es_lblk > newex->ec_block) {
/* A hole found. */
newex->ec_len = min(es.es_lblk - newex->ec_block,
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 718c49f..afaf9f15 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -466,7 +466,8 @@ static loff_t ext4_seek_data(struct file *file, loff_t offset, loff_t maxsize)
*/
es.es_lblk = last;
(void)ext4_es_find_extent(inode, &es);
- if (last >= es.es_lblk && last < es.es_lblk + es.es_len) {
+ if (ext4_es_is_delayed(&es) &&
+ last >= es.es_lblk && last < es.es_lblk + es.es_len) {
if (last != start)
dataoff = last << blkbits;
break;
@@ -550,7 +551,8 @@ static loff_t ext4_seek_hole(struct file *file, loff_t offset, loff_t maxsize)
*/
es.es_lblk = last;
(void)ext4_es_find_extent(inode, &es);
- if (last >= es.es_lblk && last < es.es_lblk + es.es_len) {
+ if (ext4_es_is_delayed(&es) &&
+ last >= es.es_lblk && last < es.es_lblk + es.es_len) {
last = es.es_lblk + es.es_len;
holeoff = last << blkbits;
continue;
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index e09c7cf..f0dda2a 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -527,20 +527,20 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
retval = ext4_ind_map_blocks(handle, inode, map, flags &
EXT4_GET_BLOCKS_KEEP_SIZE);
}
+ if (retval > 0) {
+ int ret, status;
+ status = map->m_flags & EXT4_MAP_UNWRITTEN ?
+ EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN;
+ ret = ext4_es_insert_extent(inode, map->m_lblk,
+ map->m_len, map->m_pblk, status);
+ if (ret < 0)
+ retval = ret;
+ }
if (!(flags & EXT4_GET_BLOCKS_NO_LOCK))
up_read((&EXT4_I(inode)->i_data_sem));
if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) {
- 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);
+ int ret = check_block_validity(inode, map);
if (ret != 0)
return ret;
}
@@ -615,18 +615,27 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
(flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE))
ext4_da_update_reserve_space(inode, retval, 1);
}
- if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) {
+ if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
ext4_clear_inode_state(inode, EXT4_STATE_DELALLOC_RESERVED);
- if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) {
- int ret;
-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;
- }
+ if (retval > 0) {
+ int ret, status;
+
+ if (flags & EXT4_GET_BLOCKS_PRE_IO)
+ status = EXTENT_STATUS_UNWRITTEN;
+ else if (flags & EXT4_GET_BLOCKS_CONVERT)
+ status = EXTENT_STATUS_WRITTEN;
+ else if (flags & EXT4_GET_BLOCKS_UNINIT_EXT)
+ status = EXTENT_STATUS_UNWRITTEN;
+ else if (flags & EXT4_GET_BLOCKS_CREATE)
+ status = EXTENT_STATUS_WRITTEN;
+ else
+ BUG_ON(1);
+
+ ret = ext4_es_insert_extent(inode, map->m_lblk, map->m_len,
+ map->m_pblk, status);
+ if (ret < 0)
+ retval = ret;
}
up_write((&EXT4_I(inode)->i_data_sem));
@@ -1805,6 +1814,7 @@ static int ext4_da_map_blocks(struct inode *inode, sector_t iblock,
retval = ext4_ind_map_blocks(NULL, inode, map, 0);
if (retval == 0) {
+ int ret;
/*
* XXX: __block_prepare_write() unmaps passed block,
* is it OK?
@@ -1813,20 +1823,33 @@ static int ext4_da_map_blocks(struct inode *inode, sector_t iblock,
* then we dont need to reserve it again. */
if ((EXT4_SB(inode->i_sb)->s_cluster_ratio == 1) ||
!ext4_find_delalloc_cluster(inode, map->m_lblk)) {
- retval = ext4_da_reserve_space(inode, iblock);
- if (retval)
+ ret = ext4_da_reserve_space(inode, iblock);
+ if (ret) {
/* not enough space to reserve */
+ retval = ret;
goto out_unlock;
+ }
}
- retval = ext4_es_insert_extent(inode, map->m_lblk, map->m_len,
- ~0, EXTENT_STATUS_DELAYED);
- if (retval)
+ ret = ext4_es_insert_extent(inode, map->m_lblk, map->m_len,
+ ~0, EXTENT_STATUS_DELAYED);
+ if (ret) {
+ retval = ret;
goto out_unlock;
+ }
map_bh(bh, inode->i_sb, invalid_block);
set_buffer_new(bh);
set_buffer_delay(bh);
+ } else if (retval > 0) {
+ int ret, status;
+
+ status = map->m_flags & EXT4_MAP_UNWRITTEN ?
+ EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN;
+ ret = ext4_es_insert_extent(inode, map->m_lblk, map->m_len,
+ map->m_pblk, status);
+ if (ret != 0)
+ retval = ret;
}
out_unlock:
--
1.7.12.rc2.18.g61b472e
--
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