The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/quota_v1.c

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
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    1 #include <linux/errno.h>
    2 #include <linux/fs.h>
    3 #include <linux/quota.h>
    4 #include <linux/quotaops.h>
    5 #include <linux/dqblk_v1.h>
    6 #include <linux/quotaio_v1.h>
    7 #include <linux/kernel.h>
    8 #include <linux/init.h>
    9 #include <linux/module.h>
   10 
   11 #include <asm/byteorder.h>
   12 
   13 MODULE_AUTHOR("Jan Kara");
   14 MODULE_DESCRIPTION("Old quota format support");
   15 MODULE_LICENSE("GPL");
   16 
   17 static void v1_disk2mem_dqblk(struct mem_dqblk *m, struct v1_disk_dqblk *d)
   18 {
   19         m->dqb_ihardlimit = d->dqb_ihardlimit;
   20         m->dqb_isoftlimit = d->dqb_isoftlimit;
   21         m->dqb_curinodes = d->dqb_curinodes;
   22         m->dqb_bhardlimit = d->dqb_bhardlimit;
   23         m->dqb_bsoftlimit = d->dqb_bsoftlimit;
   24         m->dqb_curspace = ((qsize_t)d->dqb_curblocks) << QUOTABLOCK_BITS;
   25         m->dqb_itime = d->dqb_itime;
   26         m->dqb_btime = d->dqb_btime;
   27 }
   28 
   29 static void v1_mem2disk_dqblk(struct v1_disk_dqblk *d, struct mem_dqblk *m)
   30 {
   31         d->dqb_ihardlimit = m->dqb_ihardlimit;
   32         d->dqb_isoftlimit = m->dqb_isoftlimit;
   33         d->dqb_curinodes = m->dqb_curinodes;
   34         d->dqb_bhardlimit = m->dqb_bhardlimit;
   35         d->dqb_bsoftlimit = m->dqb_bsoftlimit;
   36         d->dqb_curblocks = toqb(m->dqb_curspace);
   37         d->dqb_itime = m->dqb_itime;
   38         d->dqb_btime = m->dqb_btime;
   39 }
   40 
   41 static int v1_read_dqblk(struct dquot *dquot)
   42 {
   43         int type = dquot->dq_type;
   44         struct v1_disk_dqblk dqblk;
   45 
   46         if (!sb_dqopt(dquot->dq_sb)->files[type])
   47                 return -EINVAL;
   48 
   49         /* Set structure to 0s in case read fails/is after end of file */
   50         memset(&dqblk, 0, sizeof(struct v1_disk_dqblk));
   51         dquot->dq_sb->s_op->quota_read(dquot->dq_sb, type, (char *)&dqblk, sizeof(struct v1_disk_dqblk), v1_dqoff(dquot->dq_id));
   52 
   53         v1_disk2mem_dqblk(&dquot->dq_dqb, &dqblk);
   54         if (dquot->dq_dqb.dqb_bhardlimit == 0 && dquot->dq_dqb.dqb_bsoftlimit == 0 &&
   55             dquot->dq_dqb.dqb_ihardlimit == 0 && dquot->dq_dqb.dqb_isoftlimit == 0)
   56                 set_bit(DQ_FAKE_B, &dquot->dq_flags);
   57         dqstats.reads++;
   58 
   59         return 0;
   60 }
   61 
   62 static int v1_commit_dqblk(struct dquot *dquot)
   63 {
   64         short type = dquot->dq_type;
   65         ssize_t ret;
   66         struct v1_disk_dqblk dqblk;
   67 
   68         v1_mem2disk_dqblk(&dqblk, &dquot->dq_dqb);
   69         if (dquot->dq_id == 0) {
   70                 dqblk.dqb_btime = sb_dqopt(dquot->dq_sb)->info[type].dqi_bgrace;
   71                 dqblk.dqb_itime = sb_dqopt(dquot->dq_sb)->info[type].dqi_igrace;
   72         }
   73         ret = 0;
   74         if (sb_dqopt(dquot->dq_sb)->files[type])
   75                 ret = dquot->dq_sb->s_op->quota_write(dquot->dq_sb, type, (char *)&dqblk,
   76                                         sizeof(struct v1_disk_dqblk), v1_dqoff(dquot->dq_id));
   77         if (ret != sizeof(struct v1_disk_dqblk)) {
   78                 printk(KERN_WARNING "VFS: dquota write failed on dev %s\n",
   79                         dquot->dq_sb->s_id);
   80                 if (ret >= 0)
   81                         ret = -EIO;
   82                 goto out;
   83         }
   84         ret = 0;
   85 
   86 out:
   87         dqstats.writes++;
   88 
   89         return ret;
   90 }
   91 
   92 /* Magics of new quota format */
   93 #define V2_INITQMAGICS {\
   94         0xd9c01f11,     /* USRQUOTA */\
   95         0xd9c01927      /* GRPQUOTA */\
   96 }
   97 
   98 /* Header of new quota format */
   99 struct v2_disk_dqheader {
  100         __le32 dqh_magic;        /* Magic number identifying file */
  101         __le32 dqh_version;      /* File version */
  102 };
  103 
  104 static int v1_check_quota_file(struct super_block *sb, int type)
  105 {
  106         struct inode *inode = sb_dqopt(sb)->files[type];
  107         ulong blocks;
  108         size_t off; 
  109         struct v2_disk_dqheader dqhead;
  110         ssize_t size;
  111         loff_t isize;
  112         static const uint quota_magics[] = V2_INITQMAGICS;
  113 
  114         isize = i_size_read(inode);
  115         if (!isize)
  116                 return 0;
  117         blocks = isize >> BLOCK_SIZE_BITS;
  118         off = isize & (BLOCK_SIZE - 1);
  119         if ((blocks % sizeof(struct v1_disk_dqblk) * BLOCK_SIZE + off) % sizeof(struct v1_disk_dqblk))
  120                 return 0;
  121         /* Doublecheck whether we didn't get file with new format - with old quotactl() this could happen */
  122         size = sb->s_op->quota_read(sb, type, (char *)&dqhead, sizeof(struct v2_disk_dqheader), 0);
  123         if (size != sizeof(struct v2_disk_dqheader))
  124                 return 1;       /* Probably not new format */
  125         if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type])
  126                 return 1;       /* Definitely not new format */
  127         printk(KERN_INFO "VFS: %s: Refusing to turn on old quota format on given file. It probably contains newer quota format.\n", sb->s_id);
  128         return 0;               /* Seems like a new format file -> refuse it */
  129 }
  130 
  131 static int v1_read_file_info(struct super_block *sb, int type)
  132 {
  133         struct quota_info *dqopt = sb_dqopt(sb);
  134         struct v1_disk_dqblk dqblk;
  135         int ret;
  136 
  137         if ((ret = sb->s_op->quota_read(sb, type, (char *)&dqblk, sizeof(struct v1_disk_dqblk), v1_dqoff(0))) != sizeof(struct v1_disk_dqblk)) {
  138                 if (ret >= 0)
  139                         ret = -EIO;
  140                 goto out;
  141         }
  142         ret = 0;
  143         /* limits are stored as unsigned 32-bit data */
  144         dqopt->info[type].dqi_maxblimit = 0xffffffff;
  145         dqopt->info[type].dqi_maxilimit = 0xffffffff;
  146         dqopt->info[type].dqi_igrace = dqblk.dqb_itime ? dqblk.dqb_itime : MAX_IQ_TIME;
  147         dqopt->info[type].dqi_bgrace = dqblk.dqb_btime ? dqblk.dqb_btime : MAX_DQ_TIME;
  148 out:
  149         return ret;
  150 }
  151 
  152 static int v1_write_file_info(struct super_block *sb, int type)
  153 {
  154         struct quota_info *dqopt = sb_dqopt(sb);
  155         struct v1_disk_dqblk dqblk;
  156         int ret;
  157 
  158         dqopt->info[type].dqi_flags &= ~DQF_INFO_DIRTY;
  159         if ((ret = sb->s_op->quota_read(sb, type, (char *)&dqblk,
  160             sizeof(struct v1_disk_dqblk), v1_dqoff(0))) != sizeof(struct v1_disk_dqblk)) {
  161                 if (ret >= 0)
  162                         ret = -EIO;
  163                 goto out;
  164         }
  165         dqblk.dqb_itime = dqopt->info[type].dqi_igrace;
  166         dqblk.dqb_btime = dqopt->info[type].dqi_bgrace;
  167         ret = sb->s_op->quota_write(sb, type, (char *)&dqblk,
  168               sizeof(struct v1_disk_dqblk), v1_dqoff(0));
  169         if (ret == sizeof(struct v1_disk_dqblk))
  170                 ret = 0;
  171         else if (ret > 0)
  172                 ret = -EIO;
  173 out:
  174         return ret;
  175 }
  176 
  177 static struct quota_format_ops v1_format_ops = {
  178         .check_quota_file       = v1_check_quota_file,
  179         .read_file_info         = v1_read_file_info,
  180         .write_file_info        = v1_write_file_info,
  181         .free_file_info         = NULL,
  182         .read_dqblk             = v1_read_dqblk,
  183         .commit_dqblk           = v1_commit_dqblk,
  184 };
  185 
  186 static struct quota_format_type v1_quota_format = {
  187         .qf_fmt_id      = QFMT_VFS_OLD,
  188         .qf_ops         = &v1_format_ops,
  189         .qf_owner       = THIS_MODULE
  190 };
  191 
  192 static int __init init_v1_quota_format(void)
  193 {
  194         return register_quota_format(&v1_quota_format);
  195 }
  196 
  197 static void __exit exit_v1_quota_format(void)
  198 {
  199         unregister_quota_format(&v1_quota_format);
  200 }
  201 
  202 module_init(init_v1_quota_format);
  203 module_exit(exit_v1_quota_format);
  204 

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