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