fs/umsdos/file.c

   1 /*
   2  *  linux/fs/umsdos/file.c
   3  *
   4  *  Written 1993 by Jacques Gelinas
   5  *      inspired from linux/fs/msdos/file.c Werner Almesberger
   6  *
   7  *  Extended MS-DOS regular file handling primitives
   8  */
   9
  10 #include <linux/sched.h>
  11 #include <linux/fs.h>
  12 #include <linux/msdos_fs.h>
  13 #include <linux/errno.h>
  14 #include <linux/fcntl.h>
  15 #include <linux/stat.h>
  16 #include <linux/msdos_fs.h>
  17 #include <linux/umsdos_fs.h>
  18
  19 #include <asm/uaccess.h>
  20 #include <asm/system.h>
  21
  22 #define PRINTK(x)
  23 #define Printk(x)       printk x
  24
  25
  26 /*
  27  * Read a file into user space memory
  28  */
  29 static ssize_t UMSDOS_file_read (
  30                                         struct file *filp,
  31                                         char *buf,
  32                                         size_t count,
  33                                         loff_t * ppos
  34 )
  35 {
  36         struct dentry *dentry = filp->f_dentry;
  37         struct inode *inode = dentry->d_inode;
  38
  39         /* We have to set the access time because msdos don't care */
  40         /* FIXME */
  41         int ret = fat_file_read (filp, buf, count, ppos);
  42
  43         if (!IS_RDONLY (inode)) {
  44                 inode->i_atime = CURRENT_TIME;
  45                 /* FIXME
  46                  * inode->i_dirt = 1;
  47                  */
  48         }
  49         return ret;
  50 }
  51
  52
  53 /*
  54  * Write a file from user space memory
  55  */
  56 static ssize_t UMSDOS_file_write (
  57                                          struct file *filp,
  58                                          const char *buf,
  59                                          size_t count,
  60                                          loff_t * ppos)
  61 {
  62         return fat_file_write (filp, buf, count, ppos);
  63 }
  64
  65
  66 /*
  67  * Truncate a file to 0 length.
  68  */
  69 static void UMSDOS_truncate (struct inode *inode)
  70 {
  71         Printk (("UMSDOS_truncate\n"));
  72         fat_truncate (inode);
  73         inode->i_ctime = inode->i_mtime = CURRENT_TIME;
  74
  75         /*FIXME inode->i_dirt = 1; */
  76 }
  77
  78 /* Function for normal file system (512 bytes hardware sector size) */
  79 struct file_operations umsdos_file_operations =
  80 {
  81         NULL,                   /* lseek - default */
  82         UMSDOS_file_read,       /* read */
  83         UMSDOS_file_write,      /* write */
  84         NULL,                   /* readdir - bad */
  85         NULL,                   /* poll - default */
  86         NULL,                   /* ioctl - default */
  87         generic_file_mmap,      /* mmap */
  88         NULL,                   /* no special open is needed */
  89         NULL,                   /* flush */
  90         NULL,                   /* release */
  91         file_fsync              /* fsync */
  92 };
  93
  94 struct inode_operations umsdos_file_inode_operations =
  95 {
  96         &umsdos_file_operations,        /* default file operations */
  97         NULL,                   /* create */
  98         NULL,                   /* lookup */
  99         NULL,                   /* link */
 100         NULL,                   /* unlink */
 101         NULL,                   /* symlink */
 102         NULL,                   /* mkdir */
 103         NULL,                   /* rmdir */
 104         NULL,                   /* mknod */
 105         NULL,                   /* rename */
 106         NULL,                   /* readlink */
 107         NULL,                   /* follow_link */
 108         generic_readpage,       /* readpage */
 109         NULL,                   /* writepage */
 110         fat_bmap,               /* bmap */
 111         UMSDOS_truncate,        /* truncate */
 112         NULL,                   /* permission */
 113         fat_smap                /* smap */
 114 };
 115
 116 /* For other with larger and unaligned file system */
 117 struct file_operations umsdos_file_operations_no_bmap =
 118 {
 119         NULL,                   /* lseek - default */
 120         UMSDOS_file_read,       /* read */
 121         UMSDOS_file_write,      /* write */
 122         NULL,                   /* readdir - bad */
 123         NULL,                   /* poll - default */
 124         NULL,                   /* ioctl - default */
 125         fat_mmap,               /* mmap */
 126         NULL,                   /* no special open is needed */
 127         NULL,                   /* flush */
 128         NULL,                   /* release */
 129         file_fsync              /* fsync */
 130 };
 131
 132 struct inode_operations umsdos_file_inode_operations_no_bmap =
 133 {
 134         &umsdos_file_operations_no_bmap,        /* default file operations */
 135         NULL,                   /* create */
 136         NULL,                   /* lookup */
 137         NULL,                   /* link */
 138         NULL,                   /* unlink */
 139         NULL,                   /* symlink */
 140         NULL,                   /* mkdir */
 141         NULL,                   /* rmdir */
 142         NULL,                   /* mknod */
 143         NULL,                   /* rename */
 144         NULL,                   /* readlink */
 145         NULL,                   /* follow link */
 146         NULL,                   /* readpage */
 147         NULL,                   /* writepage */
 148         NULL,                   /* bmap */
 149         UMSDOS_truncate,        /* truncate */
 150         NULL,                   /* permission */
 151         NULL,                   /* smap */
 152 };
 153
 154 /* For other with larger and unaligned file system with readpage */
 155 struct file_operations umsdos_file_operations_readpage =
 156 {
 157         NULL,                   /* lseek - default */
 158         UMSDOS_file_read,       /* read */
 159         UMSDOS_file_write,      /* write */
 160         NULL,                   /* readdir - bad */
 161         NULL,                   /* poll - default */
 162         NULL,                   /* ioctl - default */
 163         generic_file_mmap,      /* mmap */
 164         NULL,                   /* no special open is needed */
 165         NULL,                   /* flush */
 166         NULL,                   /* release */
 167         file_fsync              /* fsync */
 168 };
 169
 170 struct inode_operations umsdos_file_inode_operations_readpage =
 171 {
 172         &umsdos_file_operations_readpage,       /* default file operations */
 173         NULL,                   /* create */
 174         NULL,                   /* lookup */
 175         NULL,                   /* link */
 176         NULL,                   /* unlink */
 177         NULL,                   /* symlink */
 178         NULL,                   /* mkdir */
 179         NULL,                   /* rmdir */
 180         NULL,                   /* mknod */
 181         NULL,                   /* rename */
 182         NULL,                   /* readlink */
 183         NULL,                   /* follow link */
 184         fat_readpage,           /* readpage */
 185         NULL,                   /* writepage */
 186         NULL,                   /* bmap */
 187         UMSDOS_truncate,        /* truncate */
 188         NULL,                   /* permission */
 189         NULL,                   /* smap */
 190 };