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quota: clean up checks for supported quota methods

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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>
This commit is contained in:
Christoph Hellwig 2010-02-16 03:44:48 -05:00 committed by Jan Kara
parent c411e5f66a
commit f450d4fee4
1 changed files with 37 additions and 84 deletions
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121
fs/quota/quota.c
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@ -33,54 +33,6 @@ static int generic_quotactl_valid(struct super_block *sb, int type, int cmd,
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 @@ static int xqm_quotactl_valid(struct super_block *sb, int type, int cmd,
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 @@ static int quota_quotaon(struct super_block *sb, int type, int cmd, qid_t id,
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 @@ static int quota_getinfo(struct super_block *sb, int type, void __user *addr)
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 @@ static int quota_setinfo(struct super_block *sb, int type, void __user *addr)
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 @@ static int quota_getquota(struct super_block *sb, int type, qid_t id,
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 @@ static int quota_setquota(struct super_block *sb, int type, qid_t id,
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 @@ static int quota_setxstate(struct super_block *sb, int cmd, void __user *addr)
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 @@ static int quota_getxstate(struct super_block *sb, void __user *addr)
{
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 @@ static int quota_setxquota(struct super_block *sb, int type, qid_t id,
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 @@ static int quota_getxquota(struct super_block *sb, int type, qid_t id,
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 @@ static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id,
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 @@ static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id,
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 @@ static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id,
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;
}
/*