linux-ext4 - [RFC][PATCH 6/12]ext4: Add the EXT4_IOC_GROUP

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Date:	Sat, 27 Sep 2008 16:26:55 +0900
From:	Akira Fujita <a-fujita@...jp.nec.com>
To:	linux-ext4@...r.kernel.org
CC:	linux-fsdevel@...r.kernel.org
Subject: [RFC][PATCH 6/12]ext4: Add the EXT4_IOC_GROUP_INFO ioctl

ext4: online defrag -- Add the EXT4_IOC_GROUP_INFO ioctl.

From: Akira Fujita <a-fujita@...jp.nec.com>

The EXT4_IOC_GROUP_INFO ioctl gets the block group information
of target inode is located in.  This ioctl is used only in the force defrag (-f).

The defragger will do the same thing in user space instead of
implement the ioctl, so this ioctl will go away in the next version.

Signed-off-by: Akira Fujita <a-fujita@...jp.nec.com>
Signed-off-by: Takashi Sato <t-sato@...jp.nec.com>
---
 fs/ext4/defrag.c |   11 +++++++++++
 fs/ext4/ext4.h   |    6 ++++++
 fs/ext4/ioctl.c  |    3 ++-
 3 files changed, 19 insertions(+), 1 deletions(-)

diff --git a/fs/ext4/defrag.c b/fs/ext4/defrag.c
index 49b8d49..cb7d237 100644
--- a/fs/ext4/defrag.c
+++ b/fs/ext4/defrag.c
@@ -114,6 +114,17 @@ int ext4_defrag_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
 		block = ext4_bmap(mapping, block);

 		return put_user(block, p);
+	} else if (cmd == EXT4_IOC_GROUP_INFO) {
+		struct ext4_group_data_info grp_data;
+
+		grp_data.s_blocks_per_group =
+			EXT4_BLOCKS_PER_GROUP(inode->i_sb);
+		grp_data.s_inodes_per_group =
+			EXT4_INODES_PER_GROUP(inode->i_sb);
+
+		if (copy_to_user((struct ext4_group_data_info __user *)arg,
+			&grp_data, sizeof(grp_data)))
+			return -EFAULT;
 	} else if (cmd == EXT4_IOC_DEFRAG) {
 		struct ext4_ext_defrag_data defrag;
 		struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index db4891c..a635a76 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -304,6 +304,7 @@ struct ext4_new_group_data {
  /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 #define EXT4_IOC_DEFRAG			_IOW('f', 15, struct ext4_ext_defrag_data)
 #define EXT4_IOC_FIBMAP			_IOW('f', 16, ext4_fsblk_t)
+#define EXT4_IOC_GROUP_INFO		_IOW('f', 17, struct ext4_group_data_info)

 /*
  * ioctl commands in 32 bit emulation
@@ -327,6 +328,11 @@ struct ext4_ext_defrag_data {
 	ext4_fsblk_t goal;		/* block offset for allocation */
 };

+struct ext4_group_data_info {
+	int s_blocks_per_group;		/* blocks per group */
+	int s_inodes_per_group;		/* inodes per group */
+};
+
 #define EXT4_TRANS_META_BLOCKS 4 /* bitmap + group desc + sb + inode */

 /*
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 5982f3e..c05502f 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -257,7 +257,8 @@ setversion_out:
 		return err;
 	}
 	case EXT4_IOC_FIBMAP:
-	case EXT4_IOC_DEFRAG: {
+	case EXT4_IOC_DEFRAG:
+	case EXT4_IOC_GROUP_INFO: {
 		return ext4_defrag_ioctl(inode, filp, cmd, arg);
 	}
 	case EXT4_IOC_GROUP_ADD: {

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