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 03/15] ext4: add a function which sets up a new group desc
Date: Tue, 30 Aug 2011 16:10:13 +0800 [thread overview]
Message-ID: <1314691825-12295-4-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_setup_new_desc() which sets
up a new group descriptor and whose code is sopied 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 | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 54 insertions(+), 0 deletions(-)
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index b577647..66ca671 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -777,6 +777,60 @@ out:
return err;
}
+/*
+ * ext4_setup_new_desc() sets up group descriptors specified by @input.
+ *
+ * @handle: journal handle
+ * @sb: super block
+ */
+static int ext4_setup_new_desc(handle_t *handle, struct super_block *sb,
+ struct ext4_new_group_data *input)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ ext4_group_t group;
+ struct ext4_group_desc *gdp;
+ struct buffer_head *gdb_bh;
+ int gdb_off, gdb_num, err = 0;
+
+ group = input->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));
+ /* LV FIXME */
+ memset(gdp, 0, EXT4_DESC_SIZE(sb));
+ ext4_block_bitmap_set(sb, gdp, input->block_bitmap); /* LV FIXME */
+ ext4_inode_bitmap_set(sb, gdp, input->inode_bitmap); /* LV FIXME */
+ ext4_inode_table_set(sb, gdp, input->inode_table); /* LV FIXME */
+ ext4_free_blks_set(sb, gdp, input->free_blocks_count);
+ ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb));
+ gdp->bg_flags = cpu_to_le16(EXT4_BG_INODE_ZEROED);
+ gdp->bg_checksum = ext4_group_desc_csum(sbi, input->group, gdp);
+
+ err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh);
+ if (unlikely(err)) {
+ ext4_std_error(sb, err);
+ return err;
+ }
+
+ /*
+ * We can allocate memory for mb_alloc based on the new group
+ * descriptor
+ */
+ err = ext4_mb_add_groupinfo(sb, group, gdp);
+
+ 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 ` [PATCH v2 02/15] ext4: add a function which adds a new desc to a fs Yongqiang Yang
2011-08-30 8:10 ` Yongqiang Yang [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1314691825-12295-4-git-send-email-xiaoqiangnk@gmail.com \
--to=xiaoqiangnk@gmail.com \
--cc=adilger@dilger.ca \
--cc=linux-ext4@vger.kernel.org \
--cc=tytso@mit.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).