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Message-Id: <1320144817-16397-4-git-send-email-hao.bigrat@gmail.com>
Date: Tue, 1 Nov 2011 18:53:32 +0800
From: Robin Dong <hao.bigrat@...il.com>
To: linux-ext4@...r.kernel.org
Cc: Robin Dong <sanbai@...bao.com>
Subject: [PATCH 3/8 bigalloc] ext4: remove unused functions and tags
From: Robin Dong <sanbai@...bao.com>
remove unused functions and tags.
Signed-off-by: Robin Dong <sanbai@...bao.com>
---
fs/ext4/extents.c | 108 -----------------------------------------------------
1 files changed, 0 insertions(+), 108 deletions(-)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index c96f64f..d3866d1 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3619,111 +3619,6 @@ out2:
}
/*
- * get_implied_cluster_alloc - check to see if the requested
- * allocation (in the map structure) overlaps with a cluster already
- * allocated in an extent.
- * @sb The filesystem superblock structure
- * @map The requested lblk->pblk mapping
- * @ex The extent structure which might contain an implied
- * cluster allocation
- *
- * This function is called by ext4_ext_map_blocks() after we failed to
- * find blocks that were already in the inode's extent tree. Hence,
- * we know that the beginning of the requested region cannot overlap
- * the extent from the inode's extent tree. There are three cases we
- * want to catch. The first is this case:
- *
- * |--- cluster # N--|
- * |--- extent ---| |---- requested region ---|
- * |==========|
- *
- * The second case that we need to test for is this one:
- *
- * |--------- cluster # N ----------------|
- * |--- requested region --| |------- extent ----|
- * |=======================|
- *
- * The third case is when the requested region lies between two extents
- * within the same cluster:
- * |------------- cluster # N-------------|
- * |----- ex -----| |---- ex_right ----|
- * |------ requested region ------|
- * |================|
- *
- * In each of the above cases, we need to set the map->m_pblk and
- * map->m_len so it corresponds to the return the extent labelled as
- * "|====|" from cluster #N, since it is already in use for data in
- * cluster EXT4_B2C(sbi, map->m_lblk). We will then return 1 to
- * signal to ext4_ext_map_blocks() that map->m_pblk should be treated
- * as a new "allocated" block region. Otherwise, we will return 0 and
- * ext4_ext_map_blocks() will then allocate one or more new clusters
- * by calling ext4_mb_new_blocks().
- */
-static int get_implied_cluster_alloc(struct super_block *sb,
- struct ext4_map_blocks *map,
- struct ext4_extent *ex,
- struct ext4_ext_path *path)
-{
- struct ext4_sb_info *sbi = EXT4_SB(sb);
- ext4_lblk_t c_offset = map->m_lblk & (sbi->s_cluster_ratio-1);
- ext4_lblk_t ex_cluster_start, ex_cluster_end;
- ext4_lblk_t rr_cluster_start, rr_cluster_end;
- ext4_lblk_t ee_block = le32_to_cpu(ex->ee_block);
- ext4_fsblk_t ee_start = ext4_ext_pblock(ex);
- unsigned int ee_len = EXT4_C2B(sbi, ext4_ext_get_actual_len(ex));
-
- /* The extent passed in that we are trying to match */
- ex_cluster_start = EXT4_B2C(sbi, ee_block);
- ex_cluster_end = EXT4_B2C(sbi, ee_block + ee_len - 1);
-
- /* The requested region passed into ext4_map_blocks() */
- rr_cluster_start = EXT4_B2C(sbi, map->m_lblk);
- rr_cluster_end = EXT4_B2C(sbi, map->m_lblk + map->m_len - 1);
-
- if ((rr_cluster_start == ex_cluster_end) ||
- (rr_cluster_start == ex_cluster_start)) {
- if (rr_cluster_start == ex_cluster_end)
- ee_start += ee_len - 1;
- map->m_pblk = (ee_start & ~(sbi->s_cluster_ratio - 1)) +
- c_offset;
- map->m_len = min(map->m_len,
- (unsigned) sbi->s_cluster_ratio - c_offset);
- /*
- * Check for and handle this case:
- *
- * |--------- cluster # N-------------|
- * |------- extent ----|
- * |--- requested region ---|
- * |===========|
- */
-
- if (map->m_lblk < ee_block)
- map->m_len = min(map->m_len, ee_block - map->m_lblk);
-
- /*
- * Check for the case where there is already another allocated
- * block to the right of 'ex' but before the end of the cluster.
- *
- * |------------- cluster # N-------------|
- * |----- ex -----| |---- ex_right ----|
- * |------ requested region ------|
- * |================|
- */
- if (map->m_lblk > ee_block) {
- ext4_lblk_t next = ext4_ext_next_allocated_block(path);
- map->m_len = min(map->m_len, next - map->m_lblk);
- }
-
- trace_ext4_get_implied_cluster_alloc_exit(sb, map, 1);
- return 1;
- }
-
- trace_ext4_get_implied_cluster_alloc_exit(sb, map, 0);
- return 0;
-}
-
-
-/*
* Block allocation/map/preallocation routine for extents based files
*
*
@@ -3755,7 +3650,6 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
unsigned int result = 0;
struct ext4_allocation_request ar;
ext4_io_end_t *io = EXT4_I(inode)->cur_aio_dio;
- ext4_lblk_t cluster_offset;
struct ext4_map_blocks punch_map;
ext_debug("blocks %u/%u requested for inode %lu\n",
@@ -3963,7 +3857,6 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
*/
map->m_flags &= ~EXT4_MAP_FROM_CLUSTER;
newex.ee_block = cpu_to_le32(map->m_lblk & ~(sbi->s_cluster_ratio-1));
- cluster_offset = map->m_lblk & (sbi->s_cluster_ratio-1);
if (ex)
BUG_ON((le32_to_cpu(ex->ee_block) +
@@ -4033,7 +3926,6 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
free_on_err = 1;
allocated_clusters = ar.len;
-got_allocated_blocks:
/* try to insert new extent into found leaf and return */
ext4_ext_store_pblock(&newex, newblock);
newex.ee_len = cpu_to_le16(allocated_clusters);
--
1.7.3.2
--
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