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Date: Tue, 15 Feb 2011 06:39:02 +0200
From: Amir Goldstein <amir73il@...il.com>
To: Aditya Kali <adityakali@...gle.com>
Cc: linux-ext4@...r.kernel.org, tytso@....edu
Subject: Re: [PATCH] e2fsprogs: reserving code points for new ext4 quota feature
On Tue, Feb 15, 2011 at 3:07 AM, Aditya Kali <adityakali@...gle.com> wrote:
> This patch adds support for detecting the new 'quota' feature in ext4.
> The patch reserves code points for usr and group quota inodes and also
> for the feature flag EXT4_FEATURE_RO_COMPAT_QUOTA.
>
> Signed-off-by: Aditya Kali <adityakali@...gle.com>
> ---
> debugfs/set_fields.c | 2 ++
> lib/blkid/probe.h | 1 +
> lib/e2p/feature.c | 2 ++
> lib/e2p/ls.c | 4 ++++
> lib/ext2fs/ext2_fs.h | 8 +++++++-
> lib/ext2fs/tst_super_size.c | 2 ++
> 6 files changed, 18 insertions(+), 1 deletions(-)
>
> diff --git a/debugfs/set_fields.c b/debugfs/set_fields.c
> index 1f4c501..a54f3e1 100644
> --- a/debugfs/set_fields.c
> +++ b/debugfs/set_fields.c
> @@ -141,6 +141,8 @@ static struct field_set_info super_fields[] = {
> parse_uint },
> { "snapshot_list", &set_sb.s_snapshot_list, 4, parse_uint },
> { "mount_opts", &set_sb.s_mount_opts, 64, parse_string },
> + { "usr_quota_inum", &set_sb.s_usr_quota_inum, 4, parse_uint },
> + { "grp_quota_inum", &set_sb.s_grp_quota_inum, 4, parse_uint },
> { 0, 0, 0, 0 }
> };
>
> diff --git a/lib/blkid/probe.h b/lib/blkid/probe.h
> index 37fc9c0..37e80ef 100644
> --- a/lib/blkid/probe.h
> +++ b/lib/blkid/probe.h
> @@ -109,6 +109,7 @@ struct ext2_super_block {
> #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
> #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
> #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
> +#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
>
> /* for s_feature_incompat */
> #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
> diff --git a/lib/e2p/feature.c b/lib/e2p/feature.c
> index c7f8a35..9324199 100644
> --- a/lib/e2p/feature.c
> +++ b/lib/e2p/feature.c
> @@ -55,6 +55,8 @@ static struct feature feature_list[] = {
> "dir_nlink" },
> { E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE,
> "extra_isize" },
> + { E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_QUOTA,
> + "quota" },
>
> { E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_COMPRESSION,
> "compression" },
> diff --git a/lib/e2p/ls.c b/lib/e2p/ls.c
> index d76902b..235832f 100644
> --- a/lib/e2p/ls.c
> +++ b/lib/e2p/ls.c
> @@ -394,6 +394,10 @@ void list_super2(struct ext2_super_block * sb, FILE *f)
> fprintf(f, "Last error block #: %llu\n",
> sb->s_last_error_block);
> }
> + fprintf(f, "User quota inode: %u\n",
> + sb->s_usr_quota_inum);
> + fprintf(f, "Group quota inode: %u\n",
> + sb->s_grp_quota_inum);
> }
>
> void list_super (struct ext2_super_block * s)
> diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
> index fee3919..74f5a2f 100644
> --- a/lib/ext2fs/ext2_fs.h
> +++ b/lib/ext2fs/ext2_fs.h
> @@ -52,6 +52,9 @@
> #define EXT2_JOURNAL_INO 8 /* Journal inode */
> #define EXT2_EXCLUDE_INO 9 /* The "exclude" inode, for snapshots */
>
> +#define EXT4_USR_QUOTA_INO 3 /* User quota inode */
> +#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
> +
> /* First non-reserved inode for old ext2 filesystems */
> #define EXT2_GOOD_OLD_FIRST_INO 11
>
> @@ -617,7 +620,9 @@ struct ext2_super_block {
> __u8 s_last_error_func[32]; /* function where the error happened */
> #define EXT4_S_ERR_END ext4_offsetof(struct ext2_super_block, s_mount_opts)
> __u8 s_mount_opts[64];
> - __u32 s_reserved[112]; /* Padding to the end of the block */
> + __u32 s_usr_quota_inum;
> + __u32 s_grp_quota_inum;
> + __u32 s_reserved[110]; /* Padding to the end of the block */
> };
>
> #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
> @@ -675,6 +680,7 @@ struct ext2_super_block {
> #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
> #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
> #define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080
> +#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
>
> #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
> #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
> diff --git a/lib/ext2fs/tst_super_size.c b/lib/ext2fs/tst_super_size.c
> index eb9114f..a3a5b44 100644
> --- a/lib/ext2fs/tst_super_size.c
> +++ b/lib/ext2fs/tst_super_size.c
> @@ -123,6 +123,8 @@ void check_superblock_fields()
> check_field(s_last_error_block);
> check_field(s_last_error_func);
> check_field(s_mount_opts);
> + check_field(s_usr_quota_inum);
> + check_field(s_grp_quota_inum);
> check_field(s_reserved);
> printf("Ending offset is %d\n\n", cur_offset);
> #endif
> --
> 1.7.3.1
> --
Your fields should probably be added to swap_super() as well.
Other then that, looks fine to me.
Amir.
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