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vfs: Add general support to enforce project quota limits

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This patch adds support for a new quota type PRJQUOTA for project quota
enforcement. Also a new method get_projid() is added into dquot_operations
structure.

Signed-off-by: Li Xi <lixi@ddn.com>
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Li Xi 2015-03-19 04:04:53 +09:00 committed by Jan Kara
parent 5ce1aca814
commit 847aac644e
4 changed files with 27 additions and 7 deletions
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20
fs/quota/dquot.c
View File

@ -1163,8 +1163,8 @@ static int need_print_warning(struct dquot_warn *warn)
return uid_eq(current_fsuid(), warn->w_dq_id.uid);
case GRPQUOTA:
return in_group_p(warn->w_dq_id.gid);
case PRJQUOTA: /* Never taken... Just make gcc happy */
return 0;
case PRJQUOTA:
return 1;
}
return 0;
}
@ -1405,6 +1405,9 @@ static void __dquot_initialize(struct inode *inode, int type)
/* First get references to structures we might need. */
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
struct kqid qid;
kprojid_t projid;
int rc;
got[cnt] = NULL;
if (type != -1 && cnt != type)
continue;
@ -1415,6 +1418,10 @@ static void __dquot_initialize(struct inode *inode, int type)
*/
if (dquots[cnt])
continue;
if (!sb_has_quota_active(sb, cnt))
continue;
init_needed = 1;
switch (cnt) {
@ -1424,6 +1431,12 @@ static void __dquot_initialize(struct inode *inode, int type)
case GRPQUOTA:
qid = make_kqid_gid(inode->i_gid);
break;
case PRJQUOTA:
rc = inode->i_sb->dq_op->get_projid(inode, &projid);
if (rc)
continue;
qid = make_kqid_projid(projid);
break;
}
got[cnt] = dqget(sb, qid);
}
@ -2176,7 +2189,8 @@ static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
error = -EROFS;
goto out_fmt;
}
if (!sb->s_op->quota_write || !sb->s_op->quota_read) {
if (!sb->s_op->quota_write || !sb->s_op->quota_read ||
(type == PRJQUOTA && sb->dq_op->get_projid == NULL)) {
error = -EINVAL;
goto out_fmt;
}

6
fs/quota/quotaio_v2.h
View File

@ -13,12 +13,14 @@
*/
#define V2_INITQMAGICS {\
0xd9c01f11, /* USRQUOTA */\
0xd9c01927 /* GRPQUOTA */\
0xd9c01927, /* GRPQUOTA */\
0xd9c03f14, /* PRJQUOTA */\
}
#define V2_INITQVERSIONS {\
1, /* USRQUOTA */\
1 /* GRPQUOTA */\
1, /* GRPQUOTA */\
1, /* PRJQUOTA */\
}
/* First generic header */

2
include/linux/quota.h
View File

@ -50,6 +50,7 @@
#undef USRQUOTA
#undef GRPQUOTA
#undef PRJQUOTA
enum quota_type {
USRQUOTA = 0, /* element used for user quotas */
GRPQUOTA = 1, /* element used for group quotas */
@ -319,6 +320,7 @@ struct dquot_operations {
/* get reserved quota for delayed alloc, value returned is managed by
* quota code only */
qsize_t *(*get_reserved_space) (struct inode *);
int (*get_projid) (struct inode *, kprojid_t *);/* Get project ID */
};
struct path;

6
include/uapi/linux/quota.h
View File

@ -36,11 +36,12 @@
#include <linux/errno.h>
#include <linux/types.h>
#define __DQUOT_VERSION__ "dquot_6.5.2"
#define __DQUOT_VERSION__ "dquot_6.6.0"
#define MAXQUOTAS 2
#define MAXQUOTAS 3
#define USRQUOTA 0 /* element used for user quotas */
#define GRPQUOTA 1 /* element used for group quotas */
#define PRJQUOTA 2 /* element used for project quotas */
/*
* Definitions for the default names of the quotas files.
@ -48,6 +49,7 @@
#define INITQFNAMES { \
"user", /* USRQUOTA */ \
"group", /* GRPQUOTA */ \
"project", /* PRJQUOTA */ \
"undefined", \
};