#include <linux/capability.h>
#include <linux/quotaops.h>
#include <linux/types.h>
+#include <linux/writeback.h>
#include <net/netlink.h>
#include <net/genetlink.h>
-/* Check validity of generic quotactl commands */
-static int generic_quotactl_valid(struct super_block *sb, int type, int cmd,
- qid_t id)
+static int check_quotactl_permission(struct super_block *sb, int type, int cmd,
+ qid_t id)
{
- if (type >= MAXQUOTAS)
- return -EINVAL;
- if (!sb && cmd != Q_SYNC)
- return -ENODEV;
- /* Is operation supported? */
- if (sb && !sb->s_qcop)
- return -ENOSYS;
-
- /* Check privileges */
- if (cmd == Q_GETQUOTA) {
- if (((type == USRQUOTA && current_euid() != id) ||
- (type == GRPQUOTA && !in_egroup_p(id))) &&
- !capable(CAP_SYS_ADMIN))
- return -EPERM;
- }
- else if (cmd != Q_GETFMT && cmd != Q_SYNC && cmd != Q_GETINFO)
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- return 0;
-}
-
-/* Check validity of XFS Quota Manager commands */
-static int xqm_quotactl_valid(struct super_block *sb, int type, int cmd,
- qid_t id)
-{
- if (type >= XQM_MAXQUOTAS)
- return -EINVAL;
- if (!sb)
- return -ENODEV;
- if (!sb->s_qcop)
- return -ENOSYS;
-
- /* Check privileges */
- if (cmd == Q_XGETQUOTA) {
- if (((type == XQM_USRQUOTA && current_euid() != id) ||
- (type == XQM_GRPQUOTA && !in_egroup_p(id))) &&
- !capable(CAP_SYS_ADMIN))
- return -EPERM;
- } else if (cmd != Q_XGETQSTAT && cmd != Q_XQUOTASYNC) {
+ switch (cmd) {
+ /* these commands do not require any special privilegues */
+ case Q_GETFMT:
+ case Q_SYNC:
+ case Q_GETINFO:
+ case Q_XGETQSTAT:
+ case Q_XQUOTASYNC:
+ break;
+ /* allow to query information for dquots we "own" */
+ case Q_GETQUOTA:
+ case Q_XGETQUOTA:
+ if ((type == USRQUOTA && current_euid() == id) ||
+ (type == GRPQUOTA && in_egroup_p(id)))
+ break;
+ /*FALLTHROUGH*/
+ default:
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
}
- return 0;
-}
-
-static int check_quotactl_valid(struct super_block *sb, int type, int cmd,
- qid_t id)
-{
- int error;
-
- if (XQM_COMMAND(cmd))
- error = xqm_quotactl_valid(sb, type, cmd, id);
- else
- error = generic_quotactl_valid(sb, type, cmd, id);
- if (!error)
- error = security_quotactl(cmd, type, id, sb);
- return error;
+ return security_quotactl(cmd, type, id, sb);
}
#ifdef CONFIG_QUOTA
{
int cnt;
- if (!sb->s_qcop->quota_sync)
+ if (!sb->s_qcop || !sb->s_qcop->quota_sync)
return;
sb->s_qcop->quota_sync(sb, type);
}
#endif
-static void sync_dquots(int type)
+static int quota_sync_all(int type)
{
struct super_block *sb;
int cnt;
+ int ret;
+
+ if (type >= MAXQUOTAS)
+ return -EINVAL;
+ ret = security_quotactl(Q_SYNC, type, 0, NULL);
+ if (ret)
+ return ret;
spin_lock(&sb_lock);
restart:
goto restart;
}
spin_unlock(&sb_lock);
+
+ return 0;
}
static int quota_quotaon(struct super_block *sb, int type, int cmd, qid_t id,
static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id,
void __user *addr)
{
+ int ret;
+
+ if (type >= (XQM_COMMAND(cmd) ? XQM_MAXQUOTAS : MAXQUOTAS))
+ return -EINVAL;
+ if (!sb->s_qcop)
+ return -ENOSYS;
+
+ ret = check_quotactl_permission(sb, type, cmd, id);
+ if (ret < 0)
+ return ret;
+
switch (cmd) {
case Q_QUOTAON:
return quota_quotaon(sb, type, cmd, id, addr);
case Q_SETQUOTA:
return quota_setquota(sb, type, id, addr);
case Q_SYNC:
- if (sb) {
- if (!sb->s_qcop->quota_sync)
- return -ENOSYS;
- sync_quota_sb(sb, type);
- } else
- sync_dquots(type);
+ if (!sb->s_qcop->quota_sync)
+ return -ENOSYS;
+ sync_quota_sb(sb, type);
return 0;
case Q_XQUOTAON:
case Q_XQUOTAOFF:
case Q_XGETQUOTA:
return quota_getxquota(sb, type, id, addr);
case Q_XQUOTASYNC:
- if (!sb->s_qcop->quota_sync)
- return -ENOSYS;
- return sb->s_qcop->quota_sync(sb, type);
+ /* caller already holds s_umount */
+ if (sb->s_flags & MS_RDONLY)
+ return -EROFS;
+ writeback_inodes_sb(sb);
+ return 0;
default:
return -EINVAL;
}
cmds = cmd >> SUBCMDSHIFT;
type = cmd & SUBCMDMASK;
- if (cmds != Q_SYNC || special) {
- sb = quotactl_block(special);
- if (IS_ERR(sb))
- return PTR_ERR(sb);
+ /*
+ * As a special case Q_SYNC can be called without a specific device.
+ * It will iterate all superblocks that have quota enabled and call
+ * the sync action on each of them.
+ */
+ if (!special) {
+ if (cmds == Q_SYNC)
+ return quota_sync_all(type);
+ return -ENODEV;
}
- ret = check_quotactl_valid(sb, type, cmds, id);
- if (ret >= 0)
- ret = do_quotactl(sb, type, cmds, id, addr);
- if (sb)
- drop_super(sb);
+ sb = quotactl_block(special);
+ if (IS_ERR(sb))
+ return PTR_ERR(sb);
+
+ ret = do_quotactl(sb, type, cmds, id, addr);
+ drop_super(sb);
return ret;
}
projects / linux-2.6.git / blobdiff