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Date: Mon, 9 Jul 2012 19:28:43 +0400
From: Dmitry Monakhov <dmonakhov@...nvz.org>
To: linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc: jack@...e.cz, Dmitry Monakhov <dmonakhov@...nvz.org>
Subject: [PATCH 1/3] Add additional owner identifier
This patch add subtree inode identifier. Subtree ID may be used as
auxiliary owner specifier in addition to standard uid/gid.
Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
---
fs/Kconfig | 7 +++++++
fs/quota/dquot.c | 10 ++++++++++
fs/quota/quotaio_v2.h | 6 ++++--
include/linux/fs.h | 1 +
include/linux/quota.h | 9 ++++++++-
include/linux/xattr.h | 3 +++
6 files changed, 33 insertions(+), 3 deletions(-)
diff --git a/fs/Kconfig b/fs/Kconfig
index c8554b5..54fc23a 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -60,6 +60,13 @@ config FILE_LOCKING
This option enables standard file locking support, required
for filesystems like NFS and for the flock() system
call. Disabling this option saves about 11k.
+config SUBTREE
+ bool "Enable subtree inode identifier"
+ default y
+ help
+ This option enables subtree inode identifier. Subtree id
+ may be used as auxiliary owner specifier in addition to
+ standard uid/gid.
source "fs/notify/Kconfig"
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 10cbe84..ebc96c9 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -1141,6 +1141,11 @@ static int need_print_warning(struct dquot_warn *warn)
return current_fsuid() == warn->w_dq_id;
case GRPQUOTA:
return in_group_p(warn->w_dq_id);
+ case SBTRQUOTA:
+ /* XXX: Currently there is no way to understand
+ which subtree this task belonges to, So print
+ a warn message unconditionally. -dmon */
+ return 1;
}
return 0;
}
@@ -1395,6 +1400,11 @@ static void __dquot_initialize(struct inode *inode, int type)
case GRPQUOTA:
id = inode->i_gid;
break;
+ case SBTRQUOTA:
+ if (!inode->i_sb->s_op->get_subtree)
+ continue;
+ id = inode->i_sb->s_op->get_subtree(inode);
+ break;
}
got[cnt] = dqget(sb, id, cnt);
}
diff --git a/fs/quota/quotaio_v2.h b/fs/quota/quotaio_v2.h
index f1966b4..a90bd18 100644
--- a/fs/quota/quotaio_v2.h
+++ b/fs/quota/quotaio_v2.h
@@ -13,12 +13,14 @@
*/
#define V2_INITQMAGICS {\
0xd9c01f11, /* USRQUOTA */\
- 0xd9c01927 /* GRPQUOTA */\
+ 0xd9c01927, /* GRPQUOTA */\
+ 0xd9c03f14 /* SBTRQUOTA */\
}
#define V2_INITQVERSIONS {\
1, /* USRQUOTA */\
- 1 /* GRPQUOTA */\
+ 1, /* GRPQUOTA */ \
+ 1 /* SBTRQUOTA */\
}
/* First generic header */
diff --git a/include/linux/fs.h b/include/linux/fs.h
index b0a6d44..2eececc 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1739,6 +1739,7 @@ struct super_operations {
int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
int (*nr_cached_objects)(struct super_block *);
void (*free_cached_objects)(struct super_block *, int);
+ u32 (*get_subtree)(const struct inode *inode);
};
/*
diff --git a/include/linux/quota.h b/include/linux/quota.h
index c09fa04..042f45a 100644
--- a/include/linux/quota.h
+++ b/include/linux/quota.h
@@ -36,11 +36,17 @@
#include <linux/errno.h>
#include <linux/types.h>
-#define __DQUOT_VERSION__ "dquot_6.5.2"
+#define __DQUOT_VERSION__ "dquot_6.6.0"
+#ifdef CONFIG_SUBTREE
+#define MAXQUOTAS 3
+#else
#define MAXQUOTAS 2
+#endif
+
#define USRQUOTA 0 /* element used for user quotas */
#define GRPQUOTA 1 /* element used for group quotas */
+#define SBTRQUOTA 2 /* element used for subtree quotas */
/*
* Definitions for the default names of the quotas files.
@@ -48,6 +54,7 @@
#define INITQFNAMES { \
"user", /* USRQUOTA */ \
"group", /* GRPQUOTA */ \
+ "subtree", /* SBTRQUOTA */ \
"undefined", \
};
diff --git a/include/linux/xattr.h b/include/linux/xattr.h
index e5d1220..b0a4d78 100644
--- a/include/linux/xattr.h
+++ b/include/linux/xattr.h
@@ -61,6 +61,9 @@
#include <linux/types.h>
+#define XATTR_SUBTREE "system.subtree"
+#define XATTR_SUBTREE_LEN (sizeof(XATTR_SUBTREE))
+
struct inode;
struct dentry;
--
1.7.1
--
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