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-rw-r--r--fs/quota.c377
1 files changed, 0 insertions, 377 deletions
diff --git a/fs/quota.c b/fs/quota.c
deleted file mode 100644
index 612e04db4b9..00000000000
--- a/fs/quota.c
+++ /dev/null
@@ -1,377 +0,0 @@
-/*
- * Quota code necessary even when VFS quota support is not compiled
- * into the kernel. The interesting stuff is over in dquot.c, here
- * we have symbols for initial quotactl(2) handling, the sysctl(2)
- * variables, etc - things needed even when quota support disabled.
- */
-
-#include <linux/fs.h>
-#include <linux/namei.h>
-#include <linux/slab.h>
-#include <asm/current.h>
-#include <asm/uaccess.h>
-#include <linux/kernel.h>
-#include <linux/smp_lock.h>
-#include <linux/security.h>
-#include <linux/syscalls.h>
-#include <linux/buffer_head.h>
-#include <linux/quotaops.h>
-
-/* Check validity of generic quotactl commands */
-static int generic_quotactl_valid(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;
-
- 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_QUOTAOFF:
- case Q_SETINFO:
- case Q_SETQUOTA:
- case Q_GETQUOTA:
- /* This is just informative test so we are satisfied without a lock */
- if (!sb_has_quota_enabled(sb, type))
- return -ESRCH;
- }
-
- /* 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;
-
- 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) ||
- (type == XQM_GRPQUOTA && !in_egroup_p(id))) &&
- !capable(CAP_SYS_ADMIN))
- return -EPERM;
- } else if (cmd != Q_XGETQSTAT && cmd != Q_XQUOTASYNC) {
- 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;
-}
-
-static void quota_sync_sb(struct super_block *sb, int type)
-{
- int cnt;
- struct inode *discard[MAXQUOTAS];
-
- sb->s_qcop->quota_sync(sb, type);
- /* This is not very clever (and fast) but currently I don't know about
- * any other simple way of getting quota data to disk and we must get
- * them there for userspace to be visible... */
- if (sb->s_op->sync_fs)
- sb->s_op->sync_fs(sb, 1);
- sync_blockdev(sb->s_bdev);
-
- /* Now when everything is written we can discard the pagecache so
- * that userspace sees the changes. We need i_sem and so we could
- * not do it inside dqonoff_sem. Moreover we need to be carefull
- * about races with quotaoff() (that is the reason why we have own
- * reference to inode). */
- down(&sb_dqopt(sb)->dqonoff_sem);
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- discard[cnt] = NULL;
- if (type != -1 && cnt != type)
- continue;
- if (!sb_has_quota_enabled(sb, cnt))
- continue;
- discard[cnt] = igrab(sb_dqopt(sb)->files[cnt]);
- }
- up(&sb_dqopt(sb)->dqonoff_sem);
- for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
- if (discard[cnt]) {
- down(&discard[cnt]->i_sem);
- truncate_inode_pages(&discard[cnt]->i_data, 0);
- up(&discard[cnt]->i_sem);
- iput(discard[cnt]);
- }
- }
-}
-
-void sync_dquots(struct super_block *sb, int type)
-{
- int cnt, dirty;
-
- if (sb) {
- if (sb->s_qcop->quota_sync)
- quota_sync_sb(sb, type);
- return;
- }
-
- spin_lock(&sb_lock);
-restart:
- list_for_each_entry(sb, &super_blocks, s_list) {
- /* This test just improves performance so it needn't be reliable... */
- for (cnt = 0, dirty = 0; cnt < MAXQUOTAS; cnt++)
- if ((type == cnt || type == -1) && sb_has_quota_enabled(sb, cnt)
- && info_any_dirty(&sb_dqopt(sb)->info[cnt]))
- dirty = 1;
- if (!dirty)
- continue;
- sb->s_count++;
- spin_unlock(&sb_lock);
- down_read(&sb->s_umount);
- if (sb->s_root && sb->s_qcop->quota_sync)
- quota_sync_sb(sb, type);
- up_read(&sb->s_umount);
- spin_lock(&sb_lock);
- if (__put_super_and_need_restart(sb))
- goto restart;
- }
- spin_unlock(&sb_lock);
-}
-
-/* Copy parameters and call proper function */
-static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id, void __user *addr)
-{
- int ret;
-
- switch (cmd) {
- case Q_QUOTAON: {
- char *pathname;
-
- if (IS_ERR(pathname = getname(addr)))
- return PTR_ERR(pathname);
- ret = sb->s_qcop->quota_on(sb, type, id, pathname);
- putname(pathname);
- return ret;
- }
- case Q_QUOTAOFF:
- return sb->s_qcop->quota_off(sb, type);
-
- case Q_GETFMT: {
- __u32 fmt;
-
- down_read(&sb_dqopt(sb)->dqptr_sem);
- if (!sb_has_quota_enabled(sb, type)) {
- up_read(&sb_dqopt(sb)->dqptr_sem);
- return -ESRCH;
- }
- fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id;
- up_read(&sb_dqopt(sb)->dqptr_sem);
- if (copy_to_user(addr, &fmt, sizeof(fmt)))
- return -EFAULT;
- return 0;
- }
- case Q_GETINFO: {
- struct if_dqinfo info;
-
- if ((ret = sb->s_qcop->get_info(sb, type, &info)))
- return ret;
- if (copy_to_user(addr, &info, sizeof(info)))
- return -EFAULT;
- return 0;
- }
- case Q_SETINFO: {
- struct if_dqinfo info;
-
- if (copy_from_user(&info, addr, sizeof(info)))
- return -EFAULT;
- return sb->s_qcop->set_info(sb, type, &info);
- }
- case Q_GETQUOTA: {
- struct if_dqblk idq;
-
- if ((ret = sb->s_qcop->get_dqblk(sb, type, id, &idq)))
- return ret;
- if (copy_to_user(addr, &idq, sizeof(idq)))
- return -EFAULT;
- return 0;
- }
- case Q_SETQUOTA: {
- struct if_dqblk idq;
-
- if (copy_from_user(&idq, addr, sizeof(idq)))
- return -EFAULT;
- return sb->s_qcop->set_dqblk(sb, type, id, &idq);
- }
- case Q_SYNC:
- sync_dquots(sb, type);
- return 0;
-
- case Q_XQUOTAON:
- case Q_XQUOTAOFF:
- case Q_XQUOTARM: {
- __u32 flags;
-
- if (copy_from_user(&flags, addr, sizeof(flags)))
- return -EFAULT;
- return sb->s_qcop->set_xstate(sb, flags, cmd);
- }
- case Q_XGETQSTAT: {
- struct fs_quota_stat fqs;
-
- if ((ret = sb->s_qcop->get_xstate(sb, &fqs)))
- return ret;
- if (copy_to_user(addr, &fqs, sizeof(fqs)))
- return -EFAULT;
- return 0;
- }
- case Q_XSETQLIM: {
- struct fs_disk_quota fdq;
-
- if (copy_from_user(&fdq, addr, sizeof(fdq)))
- return -EFAULT;
- return sb->s_qcop->set_xquota(sb, type, id, &fdq);
- }
- case Q_XGETQUOTA: {
- struct fs_disk_quota fdq;
-
- if ((ret = sb->s_qcop->get_xquota(sb, type, id, &fdq)))
- return ret;
- if (copy_to_user(addr, &fdq, sizeof(fdq)))
- return -EFAULT;
- return 0;
- }
- case Q_XQUOTASYNC:
- return sb->s_qcop->quota_sync(sb, type);
- /* We never reach here unless validity check is broken */
- default:
- BUG();
- }
- return 0;
-}
-
-/*
- * This is the system call interface. This communicates with
- * the user-level programs. Currently this only supports diskquota
- * calls. Maybe we need to add the process quotas etc. in the future,
- * but we probably should use rlimits for that.
- */
-asmlinkage long sys_quotactl(unsigned int cmd, const char __user *special, qid_t id, void __user *addr)
-{
- uint cmds, type;
- struct super_block *sb = NULL;
- struct block_device *bdev;
- char *tmp;
- int ret;
-
- cmds = cmd >> SUBCMDSHIFT;
- type = cmd & SUBCMDMASK;
-
- if (cmds != Q_SYNC || special) {
- tmp = getname(special);
- if (IS_ERR(tmp))
- return PTR_ERR(tmp);
- bdev = lookup_bdev(tmp);
- putname(tmp);
- if (IS_ERR(bdev))
- return PTR_ERR(bdev);
- sb = get_super(bdev);
- bdput(bdev);
- if (!sb)
- 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);
-
- return ret;
-}
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