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 03/12] ext4: add a structure which will be used by 64bit-resize interface
Date: Wed, 4 Jan 2012 00:07:25 -0500 [thread overview]
Message-ID: <1325653654-10478-4-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 structure which will be used by 64bit-resize interface.
Two functions which allocate and destroy the structure respectively are
added.
Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---
fs/ext4/resize.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 55 insertions(+), 0 deletions(-)
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 3bb4e7b..6076d5e 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -134,6 +134,61 @@ static int verify_group_input(struct super_block *sb,
return err;
}
+/*
+ * ext4_new_flex_group_data is used by 64bit-resize interface to add a flex
+ * group each time.
+ */
+struct ext4_new_flex_group_data {
+ struct ext4_new_group_data *groups; /* new_group_data for groups
+ in the flex group */
+ __u16 *bg_flags; /* block group flags of groups
+ in @groups */
+ ext4_group_t count; /* number of groups in @groups
+ */
+};
+
+/*
+ * alloc_flex_gd() allocates a ext4_new_flex_group_data with size of
+ * @flexbg_size.
+ *
+ * Returns NULL on failure otherwise address of the allocated structure.
+ */
+static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size)
+{
+ struct ext4_new_flex_group_data *flex_gd;
+
+ flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS);
+ if (flex_gd == NULL)
+ goto out3;
+
+ flex_gd->count = flexbg_size;
+
+ flex_gd->groups = kmalloc(sizeof(struct ext4_new_group_data) *
+ flexbg_size, GFP_NOFS);
+ if (flex_gd->groups == NULL)
+ goto out2;
+
+ flex_gd->bg_flags = kmalloc(flexbg_size * sizeof(__u16), GFP_NOFS);
+ if (flex_gd->bg_flags == NULL)
+ goto out1;
+
+ return flex_gd;
+
+out1:
+ kfree(flex_gd->groups);
+out2:
+ kfree(flex_gd);
+out3:
+ return NULL;
+}
+
+static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd)
+{
+ kfree(flex_gd->bg_flags);
+ kfree(flex_gd->groups);
+ kfree(flex_gd);
+}
+
static struct buffer_head *bclean(handle_t *handle, struct super_block *sb,
ext4_fsblk_t blk)
{
--
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 ` Theodore Ts'o [this message]
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 ` [PATCH V7 05/12] ext4: add a function which sets up a block group descriptors " Theodore Ts'o
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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