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Message-Id: <1325653654-10478-9-git-send-email-tytso@mit.edu>
Date: Wed, 4 Jan 2012 00:07:30 -0500
From: Theodore Ts'o <tytso@....edu>
To: Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc: Yongqiang Yang <xiaoqiangnk@...il.com>,
"Theodore Ts'o" <tytso@....edu>
Subject: [PATCH V7 08/12] ext4: add a new function which allocates bitmaps and inode tables
From: Yongqiang Yang <xiaoqiangnk@...il.com>
This patch adds a new function named ext4_allocates_group_table()
which allocates block bitmaps, inode bitmaps and inode tables for a
flex groups and is used by resize code.
Signed-off-by: Yongqiang Yang <xiaoqiangnk@...il.com>
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
---
fs/ext4/resize.c | 111 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 111 insertions(+), 0 deletions(-)
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 12eace0..a4075de 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -189,6 +189,117 @@ static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd)
kfree(flex_gd);
}
+/*
+ * ext4_alloc_group_tables() allocates block bitmaps, inode bitmaps
+ * and inode tables for a flex group.
+ *
+ * This function is used by 64bit-resize. Note that this function allocates
+ * group tables from the 1st group of groups contained by @flexgd, which may
+ * be a partial of a flex group.
+ *
+ * @sb: super block of fs to which the groups belongs
+ */
+static void ext4_alloc_group_tables(struct super_block *sb,
+ struct ext4_new_flex_group_data *flex_gd,
+ int flexbg_size)
+{
+ struct ext4_new_group_data *group_data = flex_gd->groups;
+ struct ext4_super_block *es = EXT4_SB(sb)->s_es;
+ ext4_fsblk_t start_blk;
+ ext4_fsblk_t last_blk;
+ ext4_group_t src_group;
+ ext4_group_t bb_index = 0;
+ ext4_group_t ib_index = 0;
+ ext4_group_t it_index = 0;
+ ext4_group_t group;
+ ext4_group_t last_group;
+ unsigned overhead;
+
+ BUG_ON(flex_gd->count == 0 || group_data == NULL);
+
+ src_group = group_data[0].group;
+ last_group = src_group + flex_gd->count - 1;
+
+ BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) !=
+ (last_group & ~(flexbg_size - 1))));
+next_group:
+ group = group_data[0].group;
+ start_blk = ext4_group_first_block_no(sb, src_group);
+ last_blk = start_blk + group_data[src_group - group].blocks_count;
+
+ overhead = ext4_bg_has_super(sb, src_group) ?
+ (1 + ext4_bg_num_gdb(sb, src_group) +
+ le16_to_cpu(es->s_reserved_gdt_blocks)) : 0;
+
+ start_blk += overhead;
+
+ BUG_ON(src_group >= group_data[0].group + flex_gd->count);
+ /* We collect contiguous blocks as much as possible. */
+ src_group++;
+ for (; src_group <= last_group; src_group++)
+ if (!ext4_bg_has_super(sb, src_group))
+ last_blk += group_data[src_group - group].blocks_count;
+ else
+ break;
+
+ /* Allocate block bitmaps */
+ for (; bb_index < flex_gd->count; bb_index++) {
+ if (start_blk >= last_blk)
+ goto next_group;
+ group_data[bb_index].block_bitmap = start_blk++;
+ ext4_get_group_no_and_offset(sb, start_blk - 1, &group, NULL);
+ group -= group_data[0].group;
+ group_data[group].free_blocks_count--;
+ if (flexbg_size > 1)
+ flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT;
+ }
+
+ /* Allocate inode bitmaps */
+ for (; ib_index < flex_gd->count; ib_index++) {
+ if (start_blk >= last_blk)
+ goto next_group;
+ group_data[ib_index].inode_bitmap = start_blk++;
+ ext4_get_group_no_and_offset(sb, start_blk - 1, &group, NULL);
+ group -= group_data[0].group;
+ group_data[group].free_blocks_count--;
+ if (flexbg_size > 1)
+ flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT;
+ }
+
+ /* Allocate inode tables */
+ for (; it_index < flex_gd->count; it_index++) {
+ if (start_blk + EXT4_SB(sb)->s_itb_per_group > last_blk)
+ goto next_group;
+ group_data[it_index].inode_table = start_blk;
+ ext4_get_group_no_and_offset(sb, start_blk, &group, NULL);
+ group -= group_data[0].group;
+ group_data[group].free_blocks_count -=
+ EXT4_SB(sb)->s_itb_per_group;
+ if (flexbg_size > 1)
+ flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT;
+
+ start_blk += EXT4_SB(sb)->s_itb_per_group;
+ }
+
+ if (test_opt(sb, DEBUG)) {
+ int i;
+ group = group_data[0].group;
+
+ printk(KERN_DEBUG "EXT4-fs: adding a flex group with "
+ "%d groups, flexbg size is %d:\n", flex_gd->count,
+ flexbg_size);
+
+ for (i = 0; i < flex_gd->count; i++) {
+ printk(KERN_DEBUG "adding %s group %u: %u "
+ "blocks (%d free)\n",
+ ext4_bg_has_super(sb, group + i) ? "normal" :
+ "no-super", group + i,
+ group_data[i].blocks_count,
+ group_data[i].free_blocks_count);
+ }
+ }
+}
+
static struct buffer_head *bclean(handle_t *handle, struct super_block *sb,
ext4_fsblk_t blk)
{
--
1.7.8.11.gefc1f.dirty
--
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