quota: clean up checks for supported quota methods
Move the checks for sb->s_qcop->foo next to the actual calls for them, same
for sb_has_quota_active checks where applicable.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/quota/quota.c b/fs/quota/quota.c
index 4d7fdc4..dcf7db9 100644
--- a/fs/quota/quota.c
+++ b/fs/quota/quota.c
@@ -33,54 +33,6 @@
if (sb && !sb->s_qcop)
return -ENOSYS;
- switch (cmd) {
- case Q_GETFMT:
- break;
- case Q_QUOTAON:
- if (!sb->s_qcop->quota_on)
- return -ENOSYS;
- break;
- case Q_QUOTAOFF:
- if (!sb->s_qcop->quota_off)
- return -ENOSYS;
- break;
- case Q_SETINFO:
- if (!sb->s_qcop->set_info)
- return -ENOSYS;
- break;
- case Q_GETINFO:
- if (!sb->s_qcop->get_info)
- return -ENOSYS;
- break;
- case Q_SETQUOTA:
- if (!sb->s_qcop->set_dqblk)
- return -ENOSYS;
- break;
- case Q_GETQUOTA:
- if (!sb->s_qcop->get_dqblk)
- return -ENOSYS;
- break;
- case Q_SYNC:
- if (sb && !sb->s_qcop->quota_sync)
- return -ENOSYS;
- break;
- default:
- return -EINVAL;
- }
-
- /* Is quota turned on for commands which need it? */
- switch (cmd) {
- case Q_GETFMT:
- case Q_GETINFO:
- case Q_SETINFO:
- case Q_SETQUOTA:
- case Q_GETQUOTA:
- /* This is just an informative test so we are satisfied
- * without the lock */
- if (!sb_has_quota_active(sb, type))
- return -ESRCH;
- }
-
/* Check privileges */
if (cmd == Q_GETQUOTA) {
if (((type == USRQUOTA && current_euid() != id) ||
@@ -106,33 +58,6 @@
if (!sb->s_qcop)
return -ENOSYS;
- switch (cmd) {
- case Q_XQUOTAON:
- case Q_XQUOTAOFF:
- case Q_XQUOTARM:
- if (!sb->s_qcop->set_xstate)
- return -ENOSYS;
- break;
- case Q_XGETQSTAT:
- if (!sb->s_qcop->get_xstate)
- return -ENOSYS;
- break;
- case Q_XSETQLIM:
- if (!sb->s_qcop->set_xquota)
- return -ENOSYS;
- break;
- case Q_XGETQUOTA:
- if (!sb->s_qcop->get_xquota)
- return -ENOSYS;
- break;
- case Q_XQUOTASYNC:
- if (!sb->s_qcop->quota_sync)
- return -ENOSYS;
- break;
- default:
- return -EINVAL;
- }
-
/* Check privileges */
if (cmd == Q_XGETQUOTA) {
if (((type == XQM_USRQUOTA && current_euid() != id) ||
@@ -238,12 +163,13 @@
void __user *addr)
{
char *pathname;
- int ret;
+ int ret = -ENOSYS;
pathname = getname(addr);
if (IS_ERR(pathname))
return PTR_ERR(pathname);
- ret = sb->s_qcop->quota_on(sb, type, id, pathname, 0);
+ if (sb->s_qcop->quota_on)
+ ret = sb->s_qcop->quota_on(sb, type, id, pathname, 0);
putname(pathname);
return ret;
}
@@ -269,6 +195,10 @@
struct if_dqinfo info;
int ret;
+ if (!sb_has_quota_active(sb, type))
+ return -ESRCH;
+ if (!sb->s_qcop->get_info)
+ return -ENOSYS;
ret = sb->s_qcop->get_info(sb, type, &info);
if (!ret && copy_to_user(addr, &info, sizeof(info)))
return -EFAULT;
@@ -281,6 +211,10 @@
if (copy_from_user(&info, addr, sizeof(info)))
return -EFAULT;
+ if (!sb_has_quota_active(sb, type))
+ return -ESRCH;
+ if (!sb->s_qcop->set_info)
+ return -ENOSYS;
return sb->s_qcop->set_info(sb, type, &info);
}
@@ -290,6 +224,10 @@
struct if_dqblk idq;
int ret;
+ if (!sb_has_quota_active(sb, type))
+ return -ESRCH;
+ if (!sb->s_qcop->get_dqblk)
+ return -ENOSYS;
ret = sb->s_qcop->get_dqblk(sb, type, id, &idq);
if (ret)
return ret;
@@ -305,6 +243,10 @@
if (copy_from_user(&idq, addr, sizeof(idq)))
return -EFAULT;
+ if (!sb_has_quota_active(sb, type))
+ return -ESRCH;
+ if (!sb->s_qcop->set_dqblk)
+ return -ENOSYS;
return sb->s_qcop->set_dqblk(sb, type, id, &idq);
}
@@ -314,6 +256,8 @@
if (copy_from_user(&flags, addr, sizeof(flags)))
return -EFAULT;
+ if (!sb->s_qcop->set_xstate)
+ return -ENOSYS;
return sb->s_qcop->set_xstate(sb, flags, cmd);
}
@@ -321,7 +265,9 @@
{
struct fs_quota_stat fqs;
int ret;
-
+
+ if (!sb->s_qcop->get_xstate)
+ return -ENOSYS;
ret = sb->s_qcop->get_xstate(sb, &fqs);
if (!ret && copy_to_user(addr, &fqs, sizeof(fqs)))
return -EFAULT;
@@ -335,6 +281,8 @@
if (copy_from_user(&fdq, addr, sizeof(fdq)))
return -EFAULT;
+ if (!sb->s_qcop->set_xquota)
+ return -ENOSYS;
return sb->s_qcop->set_xquota(sb, type, id, &fdq);
}
@@ -344,6 +292,8 @@
struct fs_disk_quota fdq;
int ret;
+ if (!sb->s_qcop->get_xquota)
+ return -ENOSYS;
ret = sb->s_qcop->get_xquota(sb, type, id, &fdq);
if (!ret && copy_to_user(addr, &fdq, sizeof(fdq)))
return -EFAULT;
@@ -358,6 +308,8 @@
case Q_QUOTAON:
return quota_quotaon(sb, type, cmd, id, addr);
case Q_QUOTAOFF:
+ if (!sb->s_qcop->quota_off)
+ return -ENOSYS;
return sb->s_qcop->quota_off(sb, type, 0);
case Q_GETFMT:
return quota_getfmt(sb, type, addr);
@@ -370,9 +322,11 @@
case Q_SETQUOTA:
return quota_setquota(sb, type, id, addr);
case Q_SYNC:
- if (sb)
+ if (sb) {
+ if (!sb->s_qcop->quota_sync)
+ return -ENOSYS;
sync_quota_sb(sb, type);
- else
+ } else
sync_dquots(type);
return 0;
case Q_XQUOTAON:
@@ -386,13 +340,12 @@
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);
- /* We never reach here unless validity check is broken */
default:
- BUG();
+ return -EINVAL;
}
-
- return 0;
}
/*