From: Theodore Ts'o <tytso@mit.edu>
To: Ext4 Developers List <linux-ext4@vger.kernel.org>
Cc: Yongqiang Yang <xiaoqiangnk@gmail.com>, "Theodore Ts'o" <tytso@mit.edu>
Subject: [PATCH V7 05/12] ext4: add a function which sets up a block group descriptors of a flex bg
Date: Wed, 4 Jan 2012 00:07:27 -0500 [thread overview]
Message-ID: <1325653654-10478-6-git-send-email-tytso@mit.edu> (raw)
In-Reply-To: <1325653654-10478-1-git-send-email-tytso@mit.edu>
From: Yongqiang Yang <xiaoqiangnk@gmail.com>
This patch adds a function named ext4_setup_new_descs which sets up the
block group descriptors of a flex bg.
Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---
fs/ext4/resize.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 56 insertions(+), 0 deletions(-)
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index e8ccb2f..098bdb8 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -1086,6 +1086,62 @@ static int ext4_add_new_descs(handle_t *handle, struct super_block *sb,
return err;
}
+/*
+ * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg
+ */
+static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb,
+ struct ext4_new_flex_group_data *flex_gd)
+{
+ struct ext4_new_group_data *group_data = flex_gd->groups;
+ struct ext4_group_desc *gdp;
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct buffer_head *gdb_bh;
+ ext4_group_t group;
+ __u16 *bg_flags = flex_gd->bg_flags;
+ int i, gdb_off, gdb_num, err = 0;
+
+
+ for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) {
+ group = group_data->group;
+
+ gdb_off = group % EXT4_DESC_PER_BLOCK(sb);
+ gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
+
+ /*
+ * get_write_access() has been called on gdb_bh by ext4_add_new_desc().
+ */
+ gdb_bh = sbi->s_group_desc[gdb_num];
+ /* Update group descriptor block for new group */
+ gdp = (struct ext4_group_desc *)((char *)gdb_bh->b_data +
+ gdb_off * EXT4_DESC_SIZE(sb));
+
+ memset(gdp, 0, EXT4_DESC_SIZE(sb));
+ ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap);
+ ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap);
+ ext4_inode_table_set(sb, gdp, group_data->inode_table);
+ ext4_free_group_clusters_set(sb, gdp,
+ EXT4_B2C(sbi, group_data->free_blocks_count));
+ ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb));
+ gdp->bg_flags = cpu_to_le16(*bg_flags);
+ gdp->bg_checksum = ext4_group_desc_csum(sbi, group, gdp);
+
+ err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh);
+ if (unlikely(err)) {
+ ext4_std_error(sb, err);
+ break;
+ }
+
+ /*
+ * We can allocate memory for mb_alloc based on the new group
+ * descriptor
+ */
+ err = ext4_mb_add_groupinfo(sb, group, gdp);
+ if (err)
+ break;
+ }
+ return err;
+}
+
/* Add group descriptor data to an existing or new group descriptor block.
* Ensure we handle all possible error conditions _before_ we start modifying
* the filesystem, because we cannot abort the transaction and not have it
--
1.7.8.11.gefc1f.dirty
next prev parent reply other threads:[~2012-01-04 5:07 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-04 5:07 [PATCH V7 00/12] Add new online resize (Ted's modified version) Theodore Ts'o
2012-01-04 5:07 ` [PATCH V7 01/12] ext4: add a function which extends a group without checking parameters Theodore Ts'o
2012-01-04 5:07 ` [PATCH V7 02/12] ext4: add a function which adds a new group descriptors to a fs Theodore Ts'o
2012-01-04 5:07 ` [PATCH V7 03/12] ext4: add a structure which will be used by 64bit-resize interface Theodore Ts'o
2012-01-04 5:07 ` [PATCH V7 04/12] ext4: add a function which sets up group blocks of a flex bg Theodore Ts'o
2012-01-04 5:07 ` Theodore Ts'o [this message]
2012-01-04 5:07 ` [PATCH V7 06/12] ext4: add a function which updates the super block during online resizing Theodore Ts'o
2012-01-04 5:07 ` [PATCH V7 07/12] ext4: pass verify_reserved_gdb() the number of group decriptors Theodore Ts'o
2012-01-04 5:07 ` [PATCH V7 08/12] ext4: add a new function which allocates bitmaps and inode tables Theodore Ts'o
2012-01-04 5:07 ` [PATCH V7 09/12] ext4: add a new function which adds a flex group to a fs Theodore Ts'o
2012-01-04 5:07 ` [PATCH V7 10/12] ext4: add new online resize interface Theodore Ts'o
2012-01-04 5:07 ` [PATCH V7 11/12] ext4: let ext4_group_extend() use common code Theodore Ts'o
2012-01-04 5:07 ` [PATCH V7 12/12] ext4: let ext4_group_add() " Theodore Ts'o
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