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Date: Fri, 30 Dec 2011 18:53:51 +0800
From: Yongqiang Yang <xiaoqiangnk@...il.com>
To: tytso@....edu
Cc: linux-ext4@...r.kernel.org, Yongqiang Yang <xiaoqiangnk@...il.com>
Subject: [PATCH V6 09/15] ext4: enable ext4_update_super() to handle a flex groups
From: Yongqiang Yang <xiaoqiangnk@...il.com>
This patch enables ext4_update_super() to handle a flex groups.
Signed-off-by: Yongqiang Yang <xiaoqiangnk@...il.com>
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
---
fs/ext4/resize.c | 58 +++++++++++++++++++++++++++++++++++++----------------
1 files changed, 40 insertions(+), 18 deletions(-)
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index f82cbee..bcc236f 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -1184,17 +1184,24 @@ static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb,
}
/*
- * ext4_update_super() updates super so that new the added group can be seen
- * by the filesystem.
+ * ext4_update_super() updates super block so that new added groups can be seen
+ * by the filesystem.
*
* @sb: super block
+ * @flex_gd: new added groups
*/
static void ext4_update_super(struct super_block *sb,
- struct ext4_new_group_data *input)
+ struct ext4_new_flex_group_data *flex_gd)
{
+ ext4_fsblk_t blocks_count = 0;
+ ext4_fsblk_t free_blocks = 0;
+ ext4_fsblk_t reserved_blocks = 0;
+ struct ext4_new_group_data *group_data = flex_gd->groups;
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct ext4_super_block *es = sbi->s_es;
+ int i;
+ BUG_ON(flex_gd->count == 0 || group_data == NULL);
/*
* Make the new blocks and inodes valid next. We do this before
* increasing the group count so that once the group is enabled,
@@ -1205,9 +1212,19 @@ static void ext4_update_super(struct super_block *sb,
* blocks/inodes before the group is live won't actually let us
* allocate the new space yet.
*/
- ext4_blocks_count_set(es, ext4_blocks_count(es) +
- input->blocks_count);
- le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb));
+ for (i = 0; i < flex_gd->count; i++) {
+ blocks_count += group_data[i].blocks_count;
+ free_blocks += group_data[i].free_blocks_count;
+ }
+
+ reserved_blocks = ext4_r_blocks_count(es) * 100;
+ do_div(reserved_blocks, ext4_blocks_count(es));
+ reserved_blocks *= blocks_count;
+ do_div(reserved_blocks, 100);
+
+ ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count);
+ le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) *
+ flex_gd->count);
/*
* We need to protect s_groups_count against other CPUs seeing
@@ -1215,11 +1232,11 @@ static void ext4_update_super(struct super_block *sb,
*
* The precise rules we use are:
*
- * * Writers must perform a smp_wmb() after updating all dependent
- * data and before modifying the groups count
+ * * Writers must perform a smp_wmb() after updating all
+ * dependent data and before modifying the groups count
*
- * * Readers must perform an smp_rmb() after reading the groups count
- * and before reading any dependent data.
+ * * Readers must perform an smp_rmb() after reading the groups
+ * count and before reading any dependent data.
*
* NB. These rules can be relaxed when checking the group count
* while freeing data, as we can only allocate from a block
@@ -1230,29 +1247,34 @@ static void ext4_update_super(struct super_block *sb,
smp_wmb();
/* Update the global fs size fields */
- sbi->s_groups_count++;
+ sbi->s_groups_count += flex_gd->count;
/* Update the reserved block counts only once the new group is
* active. */
ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) +
- input->reserved_blocks);
+ reserved_blocks);
/* Update the free space counts */
percpu_counter_add(&sbi->s_freeclusters_counter,
- EXT4_B2C(sbi, input->free_blocks_count));
+ EXT4_B2C(sbi, free_blocks));
percpu_counter_add(&sbi->s_freeinodes_counter,
- EXT4_INODES_PER_GROUP(sb));
+ EXT4_INODES_PER_GROUP(sb) * flex_gd->count);
- if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG) &&
+ if (EXT4_HAS_INCOMPAT_FEATURE(sb,
+ EXT4_FEATURE_INCOMPAT_FLEX_BG) &&
sbi->s_log_groups_per_flex) {
ext4_group_t flex_group;
- flex_group = ext4_flex_group(sbi, input->group);
- atomic_add(EXT4_B2C(sbi, input->free_blocks_count),
+ flex_group = ext4_flex_group(sbi, group_data[0].group);
+ atomic_add(EXT4_B2C(sbi, free_blocks),
&sbi->s_flex_groups[flex_group].free_clusters);
- atomic_add(EXT4_INODES_PER_GROUP(sb),
+ atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count,
&sbi->s_flex_groups[flex_group].free_inodes);
}
+ if (test_opt(sb, DEBUG))
+ printk(KERN_DEBUG "EXT4-fs: added group %u:"
+ "%llu blocks(%llu free %llu reserved)\n", flex_gd->count,
+ blocks_count, free_blocks, reserved_blocks);
}
/* Add group descriptor data to an existing or new group descriptor block.
--
1.7.5.1
--
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