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