236 lines
6.4 KiB
C
236 lines
6.4 KiB
C
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/quota.h>
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#include <linux/quotaops.h>
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#include <linux/dqblk_v1.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <asm/byteorder.h>
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#include "quotaio_v1.h"
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MODULE_AUTHOR("Jan Kara");
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MODULE_DESCRIPTION("Old quota format support");
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MODULE_LICENSE("GPL");
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#define QUOTABLOCK_BITS 10
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#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS)
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static inline qsize_t v1_stoqb(qsize_t space)
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{
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return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS;
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}
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static inline qsize_t v1_qbtos(qsize_t blocks)
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{
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return blocks << QUOTABLOCK_BITS;
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}
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static void v1_disk2mem_dqblk(struct mem_dqblk *m, struct v1_disk_dqblk *d)
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{
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m->dqb_ihardlimit = d->dqb_ihardlimit;
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m->dqb_isoftlimit = d->dqb_isoftlimit;
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m->dqb_curinodes = d->dqb_curinodes;
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m->dqb_bhardlimit = v1_qbtos(d->dqb_bhardlimit);
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m->dqb_bsoftlimit = v1_qbtos(d->dqb_bsoftlimit);
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m->dqb_curspace = v1_qbtos(d->dqb_curblocks);
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m->dqb_itime = d->dqb_itime;
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m->dqb_btime = d->dqb_btime;
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}
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static void v1_mem2disk_dqblk(struct v1_disk_dqblk *d, struct mem_dqblk *m)
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{
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d->dqb_ihardlimit = m->dqb_ihardlimit;
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d->dqb_isoftlimit = m->dqb_isoftlimit;
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d->dqb_curinodes = m->dqb_curinodes;
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d->dqb_bhardlimit = v1_stoqb(m->dqb_bhardlimit);
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d->dqb_bsoftlimit = v1_stoqb(m->dqb_bsoftlimit);
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d->dqb_curblocks = v1_stoqb(m->dqb_curspace);
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d->dqb_itime = m->dqb_itime;
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d->dqb_btime = m->dqb_btime;
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}
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static int v1_read_dqblk(struct dquot *dquot)
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{
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int type = dquot->dq_id.type;
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struct v1_disk_dqblk dqblk;
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if (!sb_dqopt(dquot->dq_sb)->files[type])
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return -EINVAL;
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/* Set structure to 0s in case read fails/is after end of file */
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memset(&dqblk, 0, sizeof(struct v1_disk_dqblk));
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dquot->dq_sb->s_op->quota_read(dquot->dq_sb, type, (char *)&dqblk,
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sizeof(struct v1_disk_dqblk),
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v1_dqoff(from_kqid(&init_user_ns, dquot->dq_id)));
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v1_disk2mem_dqblk(&dquot->dq_dqb, &dqblk);
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if (dquot->dq_dqb.dqb_bhardlimit == 0 &&
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dquot->dq_dqb.dqb_bsoftlimit == 0 &&
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dquot->dq_dqb.dqb_ihardlimit == 0 &&
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dquot->dq_dqb.dqb_isoftlimit == 0)
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set_bit(DQ_FAKE_B, &dquot->dq_flags);
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dqstats_inc(DQST_READS);
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return 0;
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}
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static int v1_commit_dqblk(struct dquot *dquot)
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{
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short type = dquot->dq_id.type;
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ssize_t ret;
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struct v1_disk_dqblk dqblk;
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v1_mem2disk_dqblk(&dqblk, &dquot->dq_dqb);
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if (((type == USRQUOTA) && uid_eq(dquot->dq_id.uid, GLOBAL_ROOT_UID)) ||
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((type == GRPQUOTA) && gid_eq(dquot->dq_id.gid, GLOBAL_ROOT_GID))) {
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dqblk.dqb_btime =
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sb_dqopt(dquot->dq_sb)->info[type].dqi_bgrace;
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dqblk.dqb_itime =
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sb_dqopt(dquot->dq_sb)->info[type].dqi_igrace;
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}
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ret = 0;
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if (sb_dqopt(dquot->dq_sb)->files[type])
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ret = dquot->dq_sb->s_op->quota_write(dquot->dq_sb, type,
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(char *)&dqblk, sizeof(struct v1_disk_dqblk),
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v1_dqoff(from_kqid(&init_user_ns, dquot->dq_id)));
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if (ret != sizeof(struct v1_disk_dqblk)) {
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quota_error(dquot->dq_sb, "dquota write failed");
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if (ret >= 0)
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ret = -EIO;
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goto out;
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}
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ret = 0;
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out:
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dqstats_inc(DQST_WRITES);
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return ret;
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}
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/* Magics of new quota format */
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#define V2_INITQMAGICS {\
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0xd9c01f11, /* USRQUOTA */\
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0xd9c01927 /* GRPQUOTA */\
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}
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/* Header of new quota format */
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struct v2_disk_dqheader {
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__le32 dqh_magic; /* Magic number identifying file */
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__le32 dqh_version; /* File version */
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};
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static int v1_check_quota_file(struct super_block *sb, int type)
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{
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struct inode *inode = sb_dqopt(sb)->files[type];
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ulong blocks;
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size_t off;
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struct v2_disk_dqheader dqhead;
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ssize_t size;
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loff_t isize;
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static const uint quota_magics[] = V2_INITQMAGICS;
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isize = i_size_read(inode);
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if (!isize)
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return 0;
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blocks = isize >> BLOCK_SIZE_BITS;
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off = isize & (BLOCK_SIZE - 1);
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if ((blocks % sizeof(struct v1_disk_dqblk) * BLOCK_SIZE + off) %
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sizeof(struct v1_disk_dqblk))
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return 0;
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/* Doublecheck whether we didn't get file with new format - with old
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* quotactl() this could happen */
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size = sb->s_op->quota_read(sb, type, (char *)&dqhead,
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sizeof(struct v2_disk_dqheader), 0);
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if (size != sizeof(struct v2_disk_dqheader))
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return 1; /* Probably not new format */
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if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type])
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return 1; /* Definitely not new format */
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printk(KERN_INFO
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"VFS: %s: Refusing to turn on old quota format on given file."
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" It probably contains newer quota format.\n", sb->s_id);
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return 0; /* Seems like a new format file -> refuse it */
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}
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static int v1_read_file_info(struct super_block *sb, int type)
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{
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struct quota_info *dqopt = sb_dqopt(sb);
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struct v1_disk_dqblk dqblk;
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int ret;
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ret = sb->s_op->quota_read(sb, type, (char *)&dqblk,
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sizeof(struct v1_disk_dqblk), v1_dqoff(0));
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if (ret != sizeof(struct v1_disk_dqblk)) {
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if (ret >= 0)
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ret = -EIO;
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goto out;
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}
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ret = 0;
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/* limits are stored as unsigned 32-bit data */
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dqopt->info[type].dqi_max_spc_limit = 0xffffffffULL << QUOTABLOCK_BITS;
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dqopt->info[type].dqi_max_ino_limit = 0xffffffff;
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dqopt->info[type].dqi_igrace =
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dqblk.dqb_itime ? dqblk.dqb_itime : MAX_IQ_TIME;
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dqopt->info[type].dqi_bgrace =
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dqblk.dqb_btime ? dqblk.dqb_btime : MAX_DQ_TIME;
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out:
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return ret;
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}
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static int v1_write_file_info(struct super_block *sb, int type)
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{
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struct quota_info *dqopt = sb_dqopt(sb);
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struct v1_disk_dqblk dqblk;
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int ret;
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dqopt->info[type].dqi_flags &= ~DQF_INFO_DIRTY;
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ret = sb->s_op->quota_read(sb, type, (char *)&dqblk,
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sizeof(struct v1_disk_dqblk), v1_dqoff(0));
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if (ret != sizeof(struct v1_disk_dqblk)) {
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if (ret >= 0)
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ret = -EIO;
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goto out;
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}
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dqblk.dqb_itime = dqopt->info[type].dqi_igrace;
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dqblk.dqb_btime = dqopt->info[type].dqi_bgrace;
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ret = sb->s_op->quota_write(sb, type, (char *)&dqblk,
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sizeof(struct v1_disk_dqblk), v1_dqoff(0));
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if (ret == sizeof(struct v1_disk_dqblk))
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ret = 0;
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else if (ret > 0)
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ret = -EIO;
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out:
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return ret;
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}
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static const struct quota_format_ops v1_format_ops = {
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.check_quota_file = v1_check_quota_file,
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.read_file_info = v1_read_file_info,
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.write_file_info = v1_write_file_info,
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.free_file_info = NULL,
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.read_dqblk = v1_read_dqblk,
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.commit_dqblk = v1_commit_dqblk,
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};
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static struct quota_format_type v1_quota_format = {
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.qf_fmt_id = QFMT_VFS_OLD,
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.qf_ops = &v1_format_ops,
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.qf_owner = THIS_MODULE
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};
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static int __init init_v1_quota_format(void)
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{
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return register_quota_format(&v1_quota_format);
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}
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static void __exit exit_v1_quota_format(void)
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{
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unregister_quota_format(&v1_quota_format);
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}
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module_init(init_v1_quota_format);
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module_exit(exit_v1_quota_format);
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