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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 */