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/dqblk_v1.h>
    5 #include <linux/quotaio_v1.h>
    6 #include <linux/kernel.h>
    7 #include <linux/init.h>
    8 #include <linux/module.h>
    9 
   10 #include <asm/uaccess.h>
   11 #include <asm/byteorder.h>
   12 
   13 static void v1_disk2mem_dqblk(struct mem_dqblk *m, struct v1_disk_dqblk *d)
   14 {
   15         m->dqb_ihardlimit = d->dqb_ihardlimit;
   16         m->dqb_isoftlimit = d->dqb_isoftlimit;
   17         m->dqb_curinodes = d->dqb_curinodes;
   18         m->dqb_bhardlimit = d->dqb_bhardlimit;
   19         m->dqb_bsoftlimit = d->dqb_bsoftlimit;
   20         m->dqb_curspace = d->dqb_curblocks << QUOTABLOCK_BITS;
   21         m->dqb_itime = d->dqb_itime;
   22         m->dqb_btime = d->dqb_btime;
   23 }
   24 
   25 static void v1_mem2disk_dqblk(struct v1_disk_dqblk *d, struct mem_dqblk *m)
   26 {
   27         d->dqb_ihardlimit = m->dqb_ihardlimit;
   28         d->dqb_isoftlimit = m->dqb_isoftlimit;
   29         d->dqb_curinodes = m->dqb_curinodes;
   30         d->dqb_bhardlimit = m->dqb_bhardlimit;
   31         d->dqb_bsoftlimit = m->dqb_bsoftlimit;
   32         d->dqb_curblocks = toqb(m->dqb_curspace);
   33         d->dqb_itime = m->dqb_itime;
   34         d->dqb_btime = m->dqb_btime;
   35 }
   36 
   37 static int v1_read_dqblk(struct dquot *dquot)
   38 {
   39         int type = dquot->dq_type;
   40         struct file *filp;
   41         mm_segment_t fs;
   42         loff_t offset;
   43         struct v1_disk_dqblk dqblk;
   44 
   45         filp = sb_dqopt(dquot->dq_sb)->files[type];
   46         if (filp == (struct file *)NULL)
   47                 return -EINVAL;
   48 
   49         memset(&dqblk, 0, sizeof(dqblk));       /* Initialize buffer in case file is too short */
   50         /* Now we are sure filp is valid */
   51         offset = v1_dqoff(dquot->dq_id);
   52         fs = get_fs();
   53         set_fs(KERNEL_DS);
   54         filp->f_op->read(filp, (char *)&dqblk, sizeof(struct v1_disk_dqblk), &offset);
   55         set_fs(fs);
   56 
   57         v1_disk2mem_dqblk(&dquot->dq_dqb, &dqblk);
   58         if (dquot->dq_dqb.dqb_bhardlimit == 0 && dquot->dq_dqb.dqb_bsoftlimit == 0 &&
   59             dquot->dq_dqb.dqb_ihardlimit == 0 && dquot->dq_dqb.dqb_isoftlimit == 0)
   60                 dquot->dq_flags |= DQ_FAKE;
   61         dqstats.reads++;
   62         return 0;
   63 }
   64 
   65 static int v1_commit_dqblk(struct dquot *dquot)
   66 {
   67         short type = dquot->dq_type;
   68         struct file *filp;
   69         mm_segment_t fs;
   70         loff_t offset;
   71         ssize_t ret;
   72         struct v1_disk_dqblk dqblk;
   73 
   74         filp = sb_dqopt(dquot->dq_sb)->files[type];
   75         offset = v1_dqoff(dquot->dq_id);
   76         fs = get_fs();
   77         set_fs(KERNEL_DS);
   78 
   79         /*
   80          * Note: clear the DQ_MOD flag unconditionally,
   81          * so we don't loop forever on failure.
   82          */
   83         v1_mem2disk_dqblk(&dqblk, &dquot->dq_dqb);
   84         dquot->dq_flags &= ~DQ_MOD;
   85         if (dquot->dq_id == 0) {
   86                 dqblk.dqb_btime = sb_dqopt(dquot->dq_sb)->info[type].dqi_bgrace;
   87                 dqblk.dqb_itime = sb_dqopt(dquot->dq_sb)->info[type].dqi_igrace;
   88         }
   89         ret = 0;
   90         if (filp)
   91                 ret = filp->f_op->write(filp, (char *)&dqblk,
   92                                         sizeof(struct v1_disk_dqblk), &offset);
   93         if (ret != sizeof(struct v1_disk_dqblk)) {
   94                 printk(KERN_WARNING "VFS: dquota write failed on dev %s\n",
   95                         kdevname(dquot->dq_dev));
   96                 if (ret >= 0)
   97                         ret = -EIO;
   98                 goto out;
   99         }
  100         ret = 0;
  101 
  102 out:
  103         set_fs(fs);
  104         dqstats.writes++;
  105         return ret;
  106 }
  107 
  108 /* Magics of new quota format */
  109 #define V2_INITQMAGICS {\
  110         0xd9c01f11,     /* USRQUOTA */\
  111         0xd9c01927      /* GRPQUOTA */\
  112 }
  113 
  114 /* Header of new quota format */
  115 struct v2_disk_dqheader {
  116         __u32 dqh_magic;        /* Magic number identifying file */
  117         __u32 dqh_version;      /* File version */
  118 };
  119 
  120 static int v1_check_quota_file(struct super_block *sb, int type)
  121 {
  122         struct file *f = sb_dqopt(sb)->files[type];
  123         struct inode *inode = f->f_dentry->d_inode;
  124         ulong blocks;
  125         size_t off; 
  126         struct v2_disk_dqheader dqhead;
  127         mm_segment_t fs;
  128         ssize_t size;
  129         loff_t offset = 0;
  130         static const uint quota_magics[] = V2_INITQMAGICS;
  131 
  132         if (!inode->i_size)
  133                 return 0;
  134         blocks = inode->i_size >> BLOCK_SIZE_BITS;
  135         off = inode->i_size & (BLOCK_SIZE - 1);
  136         if ((blocks % sizeof(struct v1_disk_dqblk) * BLOCK_SIZE + off) % sizeof(struct v1_disk_dqblk))
  137                 return 0;
  138         /* Doublecheck whether we didn't get file with new format - with old quotactl() this could happen */
  139         fs = get_fs();
  140         set_fs(KERNEL_DS);
  141         size = f->f_op->read(f, (char *)&dqhead, sizeof(struct v2_disk_dqheader), &offset);
  142         set_fs(fs);
  143         if (size != sizeof(struct v2_disk_dqheader))
  144                 return 1;       /* Probably not new format */
  145         if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type])
  146                 return 1;       /* Definitely not new format */
  147         printk(KERN_INFO "VFS: %s: Refusing to turn on old quota format on given file. It probably contains newer quota format.\n", kdevname(sb->s_dev));
  148         return 0;               /* Seems like a new format file -> refuse it */
  149 }
  150 
  151 static int v1_read_file_info(struct super_block *sb, int type)
  152 {
  153         struct quota_info *dqopt = sb_dqopt(sb);
  154         mm_segment_t fs;
  155         loff_t offset;
  156         struct file *filp = dqopt->files[type];
  157         struct v1_disk_dqblk dqblk;
  158         int ret;
  159 
  160         down(&dqopt->dqio_sem);
  161         offset = v1_dqoff(0);
  162         fs = get_fs();
  163         set_fs(KERNEL_DS);
  164         if ((ret = filp->f_op->read(filp, (char *)&dqblk, sizeof(struct v1_disk_dqblk), &offset)) != sizeof(struct v1_disk_dqblk)) {
  165                 if (ret >= 0)
  166                         ret = -EIO;
  167                 goto out;
  168         }
  169         ret = 0;
  170         dqopt->info[type].dqi_igrace = dqblk.dqb_itime ? dqblk.dqb_itime : MAX_IQ_TIME;
  171         dqopt->info[type].dqi_bgrace = dqblk.dqb_btime ? dqblk.dqb_btime : MAX_DQ_TIME;
  172 out:
  173         up(&dqopt->dqio_sem);
  174         set_fs(fs);
  175         return ret;
  176 }
  177 
  178 static int v1_write_file_info(struct super_block *sb, int type)
  179 {
  180         struct quota_info *dqopt = sb_dqopt(sb);
  181         mm_segment_t fs;
  182         struct file *filp = dqopt->files[type];
  183         struct v1_disk_dqblk dqblk;
  184         loff_t offset;
  185         int ret;
  186 
  187         down(&dqopt->dqio_sem);
  188         dqopt->info[type].dqi_flags &= ~DQF_INFO_DIRTY;
  189         offset = v1_dqoff(0);
  190         fs = get_fs();
  191         set_fs(KERNEL_DS);
  192         if ((ret = filp->f_op->read(filp, (char *)&dqblk, sizeof(struct v1_disk_dqblk), &offset)) != sizeof(struct v1_disk_dqblk)) {
  193                 if (ret >= 0)
  194                         ret = -EIO;
  195                 goto out;
  196         }
  197         dqblk.dqb_itime = dqopt->info[type].dqi_igrace;
  198         dqblk.dqb_btime = dqopt->info[type].dqi_bgrace;
  199         offset = v1_dqoff(0);
  200         ret = filp->f_op->write(filp, (char *)&dqblk, sizeof(struct v1_disk_dqblk), &offset);
  201         if (ret == sizeof(struct v1_disk_dqblk))
  202                 ret = 0;
  203         else if (ret > 0)
  204                 ret = -EIO;
  205 out:
  206         up(&dqopt->dqio_sem);
  207         set_fs(fs);
  208         return ret;
  209 }
  210 
  211 static struct quota_format_ops v1_format_ops = {
  212         check_quota_file:       v1_check_quota_file,
  213         read_file_info:         v1_read_file_info,
  214         write_file_info:        v1_write_file_info,
  215         free_file_info:         NULL,
  216         read_dqblk:             v1_read_dqblk,
  217         commit_dqblk:           v1_commit_dqblk,
  218 };
  219 
  220 static struct quota_format_type v1_quota_format = {
  221         qf_fmt_id:      QFMT_VFS_OLD,
  222         qf_ops:         &v1_format_ops,
  223         qf_owner:       THIS_MODULE
  224 };
  225 
  226 static int __init init_v1_quota_format(void)
  227 {
  228         return register_quota_format(&v1_quota_format);
  229 }
  230 
  231 static void __exit exit_v1_quota_format(void)
  232 {
  233         unregister_quota_format(&v1_quota_format);
  234 }
  235 
  236 EXPORT_NO_SYMBOLS;
  237 
  238 module_init(init_v1_quota_format);
  239 module_exit(exit_v1_quota_format);
  240 

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