From: Yongqiang Yang <xiaoqiangnk@gmail.com>
To: tytso@mit.edu
Cc: adilger@dilger.ca, linux-ext4@vger.kernel.org,
Yongqiang Yang <xiaoqiangnk@gmail.com>
Subject: [PATCH v2 02/15] ext4: add a function which adds a new desc to a fs
Date: Tue, 30 Aug 2011 16:10:12 +0800 [thread overview]
Message-ID: <1314691825-12295-3-git-send-email-xiaoqiangnk@gmail.com> (raw)
In-Reply-To: <1314691825-12295-1-git-send-email-xiaoqiangnk@gmail.com>
This patch adds a function named ext4_add_new_desc() which adds
a new desc to a fs and whose code is copied from ext4_group_add().
The function will be used by new resize implementation.
Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
---
fs/ext4/resize.c | 42 ++++++++++++++++++++++++++++++++++++++++++
1 files changed, 42 insertions(+), 0 deletions(-)
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 5126aac..b577647 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -735,6 +735,48 @@ exit_err:
}
}
+/*
+ * ext4_add_new_desc() adds group descriptor of group @group
+ *
+ * @handle: journal handle
+ * @sb; super block
+ * @group: the group no. of the first group desc to be added
+ * @resize_inode: the resize inode
+ */
+static int ext4_add_new_desc(handle_t *handle, struct super_block *sb,
+ ext4_group_t group, struct inode *resize_inode)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct ext4_super_block *es = sbi->s_es;
+ struct buffer_head *gdb_bh;
+ int gdb_off, gdb_num, err = 0;
+ int reserved_gdb = ext4_bg_has_super(sb, group) ?
+ le16_to_cpu(es->s_reserved_gdt_blocks) : 0;
+
+ gdb_off = group % EXT4_DESC_PER_BLOCK(sb);
+ gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
+
+ /*
+ * We will only either add reserved group blocks to a backup group
+ * or remove reserved blocks for the first group in a new group block.
+ * Doing both would be mean more complex code, and sane people don't
+ * use non-sparse filesystems anymore. This is already checked above.
+ */
+ if (gdb_off) {
+ gdb_bh = sbi->s_group_desc[gdb_num];
+ err = ext4_journal_get_write_access(handle, gdb_bh);
+ if (err)
+ goto out;
+
+ if (reserved_gdb && ext4_bg_num_gdb(sb, group))
+ err = reserve_backup_gdb(handle, resize_inode, group);
+ } else
+ err = add_new_gdb(handle, resize_inode, group);
+
+out:
+ 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
--
1.7.5.1
next prev parent reply other threads:[~2011-08-30 8:53 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-30 8:10 (unknown), Yongqiang Yang
2011-08-30 8:10 ` [PATCH v2 01/15] ext4: add a function which extends a group without checking parameters Yongqiang Yang
2011-10-30 13:48 ` Yongqiang Yang
2011-11-01 22:24 ` Ted Ts'o
2011-11-08 1:36 ` Yongqiang Yang
2011-08-30 8:10 ` Yongqiang Yang [this message]
2011-08-30 8:10 ` [PATCH v2 03/15] ext4: add a function which sets up a new group desc Yongqiang Yang
2011-08-30 8:10 ` [PATCH v2 04/15] ext4: add a function which updates super block Yongqiang Yang
2011-08-30 8:10 ` [PATCH v2 05/15] ext4: add a structure which will be used by 64bit-resize interface Yongqiang Yang
2011-08-30 8:10 ` [PATCH v2 06/15] ext4: add a function which sets up group blocks of a flex groups Yongqiang Yang
2011-08-30 8:10 ` [PATCH v2 07/15] ext4: add a function which adds several group descriptors Yongqiang Yang
2011-08-30 8:10 ` [PATCH v2 08/15] ext4: add a function which sets up a flex groups each time Yongqiang Yang
2011-08-30 8:10 ` [PATCH v2 09/15] ext4: enable ext4_update_super() to handle a flex groups Yongqiang Yang
2011-08-30 8:10 ` [PATCH v2 10/15] ext4: pass verify_reserved_gdb() the number of group decriptors Yongqiang Yang
2011-08-30 8:10 ` [PATCH v2 11/15] ext4: add a new function which allocates bitmaps and inode tables Yongqiang Yang
2011-08-30 8:10 ` [PATCH v2 12/15] ext4: add a new function which adds a flex group to a fs Yongqiang Yang
2011-08-30 8:10 ` [PATCH v2 13/15] ext4: add new online resize interface Yongqiang Yang
2011-08-30 8:10 ` [PATCH v2 14/15] ext4: let ext4_group_extend() use common code Yongqiang Yang
2011-08-30 8:10 ` [PATCH v2 15/15] ext4: let ext4_group_add() " Yongqiang Yang
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