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Release 4.11 fs/quota/compat.c

Directory: fs/quota
#include <linux/syscalls.h>
#include <linux/compat.h>
#include <linux/quotaops.h>

/*
 * This code works only for 32 bit quota tools over 64 bit OS (x86_64, ia64)
 * and is necessary due to alignment problems.
 */

struct compat_if_dqblk {
	
compat_u64 dqb_bhardlimit;
	
compat_u64 dqb_bsoftlimit;
	
compat_u64 dqb_curspace;
	
compat_u64 dqb_ihardlimit;
	
compat_u64 dqb_isoftlimit;
	
compat_u64 dqb_curinodes;
	
compat_u64 dqb_btime;
	
compat_u64 dqb_itime;
	
compat_uint_t dqb_valid;
};

/* XFS structures */

struct compat_fs_qfilestat {
	
compat_u64 dqb_bhardlimit;
	
compat_u64 qfs_nblks;
	
compat_uint_t qfs_nextents;
};


struct compat_fs_quota_stat {
	
__s8		qs_version;
	
__u16		qs_flags;
	
__s8		qs_pad;
	
struct compat_fs_qfilestat	qs_uquota;
	
struct compat_fs_qfilestat	qs_gquota;
	
compat_uint_t	qs_incoredqs;
	
compat_int_t	qs_btimelimit;
	
compat_int_t	qs_itimelimit;
	
compat_int_t	qs_rtbtimelimit;
	
__u16		qs_bwarnlimit;
	
__u16		qs_iwarnlimit;
};


asmlinkage long sys32_quotactl(unsigned int cmd, const char __user *special, qid_t id, void __user *addr) { unsigned int cmds; struct if_dqblk __user *dqblk; struct compat_if_dqblk __user *compat_dqblk; struct fs_quota_stat __user *fsqstat; struct compat_fs_quota_stat __user *compat_fsqstat; compat_uint_t data; u16 xdata; long ret; cmds = cmd >> SUBCMDSHIFT; switch (cmds) { case Q_GETQUOTA: dqblk = compat_alloc_user_space(sizeof(struct if_dqblk)); compat_dqblk = addr; ret = sys_quotactl(cmd, special, id, dqblk); if (ret) break; if (copy_in_user(compat_dqblk, dqblk, sizeof(*compat_dqblk)) || get_user(data, &dqblk->dqb_valid) || put_user(data, &compat_dqblk->dqb_valid)) ret = -EFAULT; break; case Q_SETQUOTA: dqblk = compat_alloc_user_space(sizeof(struct if_dqblk)); compat_dqblk = addr; ret = -EFAULT; if (copy_in_user(dqblk, compat_dqblk, sizeof(*compat_dqblk)) || get_user(data, &compat_dqblk->dqb_valid) || put_user(data, &dqblk->dqb_valid)) break; ret = sys_quotactl(cmd, special, id, dqblk); break; case Q_XGETQSTAT: fsqstat = compat_alloc_user_space(sizeof(struct fs_quota_stat)); compat_fsqstat = addr; ret = sys_quotactl(cmd, special, id, fsqstat); if (ret) break; ret = -EFAULT; /* Copying qs_version, qs_flags, qs_pad */ if (copy_in_user(compat_fsqstat, fsqstat, offsetof(struct compat_fs_quota_stat, qs_uquota))) break; /* Copying qs_uquota */ if (copy_in_user(&compat_fsqstat->qs_uquota, &fsqstat->qs_uquota, sizeof(compat_fsqstat->qs_uquota)) || get_user(data, &fsqstat->qs_uquota.qfs_nextents) || put_user(data, &compat_fsqstat->qs_uquota.qfs_nextents)) break; /* Copying qs_gquota */ if (copy_in_user(&compat_fsqstat->qs_gquota, &fsqstat->qs_gquota, sizeof(compat_fsqstat->qs_gquota)) || get_user(data, &fsqstat->qs_gquota.qfs_nextents) || put_user(data, &compat_fsqstat->qs_gquota.qfs_nextents)) break; /* Copying the rest */ if (copy_in_user(&compat_fsqstat->qs_incoredqs, &fsqstat->qs_incoredqs, sizeof(struct compat_fs_quota_stat) - offsetof(struct compat_fs_quota_stat, qs_incoredqs)) || get_user(xdata, &fsqstat->qs_iwarnlimit) || put_user(xdata, &compat_fsqstat->qs_iwarnlimit)) break; ret = 0; break; default: ret = sys_quotactl(cmd, special, id, addr); } return ret; }

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Directory: fs/quota
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