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1628 |
jcastillo |
/*
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* linux/fs/umsdos/emd.c
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*
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* Written 1993 by Jacques Gelinas
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*
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* Extended MS-DOS directory handling functions
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*/
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#include <linux/types.h>
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#include <linux/fcntl.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/msdos_fs.h>
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#include <linux/umsdos_fs.h>
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#include <asm/segment.h>
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#define PRINTK(x)
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#define Printk(x) printk x
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/*
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Read a file into kernel space memory
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*/
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int umsdos_file_read_kmem(
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struct inode *inode,
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struct file *filp,
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char *buf,
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int count)
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{
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int ret;
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int old_fs = get_fs();
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set_fs (KERNEL_DS);
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ret = fat_file_read(inode,filp,buf,count);
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set_fs (old_fs);
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return ret;
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}
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/*
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Write to a file from kernel space
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*/
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int umsdos_file_write_kmem(
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struct inode *inode,
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struct file *filp,
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const char *buf,
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int count)
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{
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int ret;
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int old_fs = get_fs();
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set_fs (KERNEL_DS);
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ret = fat_file_write(inode,filp,buf,count);
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set_fs (old_fs);
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return ret;
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}
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/*
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Write a block of bytes into one EMD file.
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The block of data is NOT in user space.
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Return 0 if ok, a negative error code if not.
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*/
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int umsdos_emd_dir_write (
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struct inode *emd_dir,
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struct file *filp,
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char *buf, /* buffer in kernel memory, not in user space */
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int count)
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{
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int written;
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filp->f_flags = 0;
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written = umsdos_file_write_kmem (emd_dir,filp,buf,count);
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return written != count ? -EIO : 0;
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}
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/*
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Read a block of bytes from one EMD file.
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The block of data is NOT in user space.
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Return 0 if ok, -EIO if any error.
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*/
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int umsdos_emd_dir_read (
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struct inode *emd_dir,
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struct file *filp,
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char *buf, /* buffer in kernel memory, not in user space */
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int count)
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{
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int ret = 0;
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int sizeread;
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filp->f_flags = 0;
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sizeread = umsdos_file_read_kmem (emd_dir,filp,buf,count);
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if (sizeread != count){
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printk ("UMSDOS: problem with EMD file. Can't read pos = %Ld (%d != %d)\n"
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,filp->f_pos,sizeread,count);
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ret = -EIO;
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}
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return ret;
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}
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/*
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Locate the EMD file in a directory and optionally, creates it.
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Return NULL if error. If ok, dir->u.umsdos_i.emd_inode
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*/
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struct inode *umsdos_emd_dir_lookup(struct inode *dir, int creat)
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{
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struct inode *ret = NULL;
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if (dir->u.umsdos_i.i_emd_dir != 0){
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ret = iget (dir->i_sb,dir->u.umsdos_i.i_emd_dir);
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PRINTK (("deja trouve %d %x [%ld] "
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,dir->u.umsdos_i.i_emd_dir,ret,ret->i_count));
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}else{
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umsdos_real_lookup (dir,UMSDOS_EMD_FILE,UMSDOS_EMD_NAMELEN,&ret);
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PRINTK (("emd_dir_lookup "));
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if (ret != NULL){
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PRINTK (("Find --linux "));
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dir->u.umsdos_i.i_emd_dir = ret->i_ino;
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}else if (creat){
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int code;
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PRINTK (("avant create "));
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dir->i_count++;
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code = msdos_create (dir,UMSDOS_EMD_FILE,UMSDOS_EMD_NAMELEN
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,S_IFREG|0777,&ret);
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PRINTK (("Creat EMD code %d ret %x ",code,ret));
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if (ret != NULL){
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dir->u.umsdos_i.i_emd_dir = ret->i_ino;
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}else{
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printk ("UMSDOS: Can't create EMD file\n");
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}
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}
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}
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if (ret != NULL){
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/* Disable UMSDOS_notify_change() for EMD file */
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ret->u.umsdos_i.i_emd_owner = 0xffffffff;
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}
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return ret;
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}
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/*
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Read an entry from the EMD file.
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Support variable length record.
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Return -EIO if error, 0 if ok.
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*/
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int umsdos_emd_dir_readentry (
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struct inode *emd_dir,
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struct file *filp,
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struct umsdos_dirent *entry)
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{
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int ret = umsdos_emd_dir_read(emd_dir,filp,(char*)entry,UMSDOS_REC_SIZE);
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if (ret == 0){
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/* Variable size record. Maybe, we have to read some more */
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int recsize = umsdos_evalrecsize (entry->name_len);
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if (recsize > UMSDOS_REC_SIZE){
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ret = umsdos_emd_dir_read(emd_dir,filp
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,((char*)entry)+UMSDOS_REC_SIZE,recsize - UMSDOS_REC_SIZE);
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}
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}
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return ret;
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}
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/*
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Write an entry in the EMD file.
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Return 0 if ok, -EIO if some error.
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*/
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int umsdos_writeentry (
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struct inode *dir,
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struct inode *emd_dir,
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struct umsdos_info *info,
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int free_entry) /* This entry is deleted, so Write all 0's */
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{
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int ret = 0;
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struct file filp;
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struct umsdos_dirent *entry = &info->entry;
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struct umsdos_dirent entry0;
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if (free_entry){
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/* #Specification: EMD file / empty entries
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Unused entry in the EMD file are identify
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by the name_len field equal to 0. However to
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help future extension (or bug correction :-( ),
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empty entries are filled with 0.
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*/
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memset (&entry0,0,sizeof(entry0));
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entry = &entry0;
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}else if (entry->name_len > 0){
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memset (entry->name+entry->name_len,'\0'
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,sizeof(entry->name)-entry->name_len);
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/* #Specification: EMD file / spare bytes
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10 bytes are unused in each record of the EMD. They
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are set to 0 all the time. So it will be possible
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to do new stuff and rely on the state of those
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bytes in old EMD file around.
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*/
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memset (entry->spare,0,sizeof(entry->spare));
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}
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filp.f_pos = info->f_pos;
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filp.f_reada = 0;
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ret = umsdos_emd_dir_write(emd_dir,&filp,(char*)entry,info->recsize);
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if (ret != 0){
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printk ("UMSDOS: problem with EMD file. Can't write\n");
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}else{
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| 198 |
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dir->i_ctime = dir->i_mtime = CURRENT_TIME;
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dir->i_dirt = 1;
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| 200 |
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}
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return ret;
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| 202 |
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}
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| 204 |
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#define CHUNK_SIZE (8*UMSDOS_REC_SIZE)
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struct find_buffer{
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| 206 |
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char buffer[CHUNK_SIZE];
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| 207 |
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int pos; /* read offset in buffer */
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| 208 |
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int size; /* Current size of buffer */
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| 209 |
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struct file filp;
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| 210 |
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};
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| 211 |
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| 212 |
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/*
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| 213 |
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Fill the read buffer and take care of the byte remaining inside.
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| 214 |
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Unread bytes are simply move to the beginning.
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| 215 |
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| 216 |
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Return -ENOENT if EOF, 0 if ok, a negative error code if any problem.
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| 217 |
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*/
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| 218 |
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static int umsdos_fillbuf (
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| 219 |
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struct inode *inode,
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| 220 |
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struct find_buffer *buf)
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| 221 |
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{
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| 222 |
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int ret = -ENOENT;
|
| 223 |
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int mustmove = buf->size - buf->pos;
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| 224 |
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int mustread;
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| 225 |
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int remain;
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| 226 |
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if (mustmove > 0){
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| 227 |
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memcpy (buf->buffer,buf->buffer+buf->pos,mustmove);
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| 228 |
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}
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| 229 |
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buf->pos = 0;
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| 230 |
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mustread = CHUNK_SIZE - mustmove;
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| 231 |
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remain = inode->i_size - buf->filp.f_pos;
|
| 232 |
|
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if (remain < mustread) mustread = remain;
|
| 233 |
|
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if (mustread > 0){
|
| 234 |
|
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ret = umsdos_emd_dir_read (inode,&buf->filp,buf->buffer+mustmove
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| 235 |
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,mustread);
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| 236 |
|
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if (ret == 0) buf->size = mustmove + mustread;
|
| 237 |
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}else if (mustmove){
|
| 238 |
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buf->size = mustmove;
|
| 239 |
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ret = 0;
|
| 240 |
|
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}
|
| 241 |
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return ret;
|
| 242 |
|
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}
|
| 243 |
|
|
|
| 244 |
|
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/*
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| 245 |
|
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General search, locate a name in the EMD file or an empty slot to
|
| 246 |
|
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store it. if info->entry.name_len == 0, search the first empty
|
| 247 |
|
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slot (of the proper size).
|
| 248 |
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|
| 249 |
|
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Caller must do iput on *pt_emd_dir.
|
| 250 |
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|
| 251 |
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Return 0 if found, -ENOENT if not found, another error code if
|
| 252 |
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other problem.
|
| 253 |
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|
| 254 |
|
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So this routine is used to either find an existing entry or to
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| 255 |
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create a new one, while making sure it is a new one. After you
|
| 256 |
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get -ENOENT, you make sure the entry is stuffed correctly and
|
| 257 |
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call umsdos_writeentry().
|
| 258 |
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|
| 259 |
|
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To delete an entry, you find it, zero out the entry (memset)
|
| 260 |
|
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and call umsdos_writeentry().
|
| 261 |
|
|
|
| 262 |
|
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All this to say that umsdos_writeentry must be call after this
|
| 263 |
|
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function since it rely on the f_pos field of info.
|
| 264 |
|
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*/
|
| 265 |
|
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static int umsdos_find (
|
| 266 |
|
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struct inode *dir,
|
| 267 |
|
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struct umsdos_info *info, /* Hold name and name_len */
|
| 268 |
|
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/* Will hold the entry found */
|
| 269 |
|
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struct inode **pt_emd_dir) /* Will hold the emd_dir inode */
|
| 270 |
|
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/* or NULL if not found */
|
| 271 |
|
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{
|
| 272 |
|
|
/* #Specification: EMD file structure
|
| 273 |
|
|
The EMD file uses a fairly simple layout. It is made of records
|
| 274 |
|
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(UMSDOS_REC_SIZE == 64). When a name can't be written is a single
|
| 275 |
|
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record, multiple contiguous record are allocated.
|
| 276 |
|
|
*/
|
| 277 |
|
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int ret = -ENOENT;
|
| 278 |
|
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struct inode *emd_dir = umsdos_emd_dir_lookup(dir,1);
|
| 279 |
|
|
if (emd_dir != NULL){
|
| 280 |
|
|
struct umsdos_dirent *entry = &info->entry;
|
| 281 |
|
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int recsize = info->recsize;
|
| 282 |
|
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struct {
|
| 283 |
|
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off_t posok; /* Position available to store the entry */
|
| 284 |
|
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int found; /* A valid empty position has been found */
|
| 285 |
|
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off_t one; /* One empty position -> maybe <- large enough */
|
| 286 |
|
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int onesize; /* size of empty region starting at one */
|
| 287 |
|
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}empty;
|
| 288 |
|
|
/* Read several entries at a time to speed up the search */
|
| 289 |
|
|
struct find_buffer buf;
|
| 290 |
|
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buf.pos = 0;
|
| 291 |
|
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buf.size = 0;
|
| 292 |
|
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buf.filp.f_pos = 0;
|
| 293 |
|
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buf.filp.f_reada = 1;
|
| 294 |
|
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empty.found = 0;
|
| 295 |
|
|
empty.posok = emd_dir->i_size;
|
| 296 |
|
|
empty.onesize = 0;
|
| 297 |
|
|
while (1){
|
| 298 |
|
|
struct umsdos_dirent *rentry = (struct umsdos_dirent*)
|
| 299 |
|
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(buf.buffer + buf.pos);
|
| 300 |
|
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int file_pos = buf.filp.f_pos - buf.size + buf.pos;
|
| 301 |
|
|
if (buf.pos == buf.size){
|
| 302 |
|
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ret = umsdos_fillbuf (emd_dir,&buf);
|
| 303 |
|
|
if (ret < 0){
|
| 304 |
|
|
/* Not found, so note where it can be added */
|
| 305 |
|
|
info->f_pos = empty.posok;
|
| 306 |
|
|
break;
|
| 307 |
|
|
}
|
| 308 |
|
|
}else if (rentry->name_len == 0){
|
| 309 |
|
|
/* We are looking for an empty section at least */
|
| 310 |
|
|
/* recsize large */
|
| 311 |
|
|
if (entry->name_len == 0){
|
| 312 |
|
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info->f_pos = file_pos;
|
| 313 |
|
|
ret = 0;
|
| 314 |
|
|
break;
|
| 315 |
|
|
}else if (!empty.found){
|
| 316 |
|
|
if (empty.onesize == 0){
|
| 317 |
|
|
/* This is the first empty record of a section */
|
| 318 |
|
|
empty.one = file_pos;
|
| 319 |
|
|
}
|
| 320 |
|
|
/* grow the empty section */
|
| 321 |
|
|
empty.onesize += UMSDOS_REC_SIZE;
|
| 322 |
|
|
if (empty.onesize == recsize){
|
| 323 |
|
|
/* here is a large enough section */
|
| 324 |
|
|
empty.posok = empty.one;
|
| 325 |
|
|
empty.found = 1;
|
| 326 |
|
|
}
|
| 327 |
|
|
}
|
| 328 |
|
|
buf.pos += UMSDOS_REC_SIZE;
|
| 329 |
|
|
}else{
|
| 330 |
|
|
int entry_size = umsdos_evalrecsize(rentry->name_len);
|
| 331 |
|
|
if (buf.pos+entry_size > buf.size){
|
| 332 |
|
|
ret = umsdos_fillbuf (emd_dir,&buf);
|
| 333 |
|
|
if (ret < 0){
|
| 334 |
|
|
/* Not found, so note where it can be added */
|
| 335 |
|
|
info->f_pos = empty.posok;
|
| 336 |
|
|
break;
|
| 337 |
|
|
}
|
| 338 |
|
|
}else{
|
| 339 |
|
|
empty.onesize = 0; /* Reset the free slot search */
|
| 340 |
|
|
if (entry->name_len == rentry->name_len
|
| 341 |
|
|
&& memcmp(entry->name,rentry->name,rentry->name_len)
|
| 342 |
|
|
==0){
|
| 343 |
|
|
info->f_pos = file_pos;
|
| 344 |
|
|
*entry = *rentry;
|
| 345 |
|
|
ret = 0;
|
| 346 |
|
|
break;
|
| 347 |
|
|
}else{
|
| 348 |
|
|
buf.pos += entry_size;
|
| 349 |
|
|
}
|
| 350 |
|
|
}
|
| 351 |
|
|
}
|
| 352 |
|
|
}
|
| 353 |
|
|
umsdos_manglename(info);
|
| 354 |
|
|
}
|
| 355 |
|
|
*pt_emd_dir = emd_dir;
|
| 356 |
|
|
return ret;
|
| 357 |
|
|
}
|
| 358 |
|
|
/*
|
| 359 |
|
|
Add a new entry in the emd file
|
| 360 |
|
|
Return 0 if ok or a negative error code.
|
| 361 |
|
|
Return -EEXIST if the entry already exist.
|
| 362 |
|
|
|
| 363 |
|
|
Complete the information missing in info.
|
| 364 |
|
|
*/
|
| 365 |
|
|
int umsdos_newentry (
|
| 366 |
|
|
struct inode *dir,
|
| 367 |
|
|
struct umsdos_info *info)
|
| 368 |
|
|
{
|
| 369 |
|
|
struct inode *emd_dir;
|
| 370 |
|
|
int ret = umsdos_find (dir,info,&emd_dir);
|
| 371 |
|
|
if (ret == 0){
|
| 372 |
|
|
ret = -EEXIST;
|
| 373 |
|
|
}else if (ret == -ENOENT){
|
| 374 |
|
|
ret = umsdos_writeentry(dir,emd_dir,info,0);
|
| 375 |
|
|
PRINTK (("umsdos_newentry EDM ret = %d\n",ret));
|
| 376 |
|
|
}
|
| 377 |
|
|
iput (emd_dir);
|
| 378 |
|
|
return ret;
|
| 379 |
|
|
}
|
| 380 |
|
|
/*
|
| 381 |
|
|
Create a new hidden link.
|
| 382 |
|
|
Return 0 if ok, an error code if not.
|
| 383 |
|
|
*/
|
| 384 |
|
|
int umsdos_newhidden (
|
| 385 |
|
|
struct inode *dir,
|
| 386 |
|
|
struct umsdos_info *info)
|
| 387 |
|
|
{
|
| 388 |
|
|
struct inode *emd_dir;
|
| 389 |
|
|
int ret;
|
| 390 |
|
|
umsdos_parse ("..LINK",6,info);
|
| 391 |
|
|
info->entry.name_len = 0;
|
| 392 |
|
|
ret = umsdos_find (dir,info,&emd_dir);
|
| 393 |
|
|
iput (emd_dir);
|
| 394 |
|
|
if (ret == -ENOENT || ret == 0){
|
| 395 |
|
|
/* #Specification: hard link / hidden name
|
| 396 |
|
|
When a hard link is created, the original file is renamed
|
| 397 |
|
|
to a hidden name. The name is "..LINKNNN" where NNN is a
|
| 398 |
|
|
number define from the entry offset in the EMD file.
|
| 399 |
|
|
*/
|
| 400 |
|
|
info->entry.name_len = sprintf (info->entry.name,"..LINK%ld"
|
| 401 |
|
|
,info->f_pos);
|
| 402 |
|
|
ret = 0;
|
| 403 |
|
|
}
|
| 404 |
|
|
return ret;
|
| 405 |
|
|
}
|
| 406 |
|
|
/*
|
| 407 |
|
|
Remove an entry from the emd file
|
| 408 |
|
|
Return 0 if ok, a negative error code otherwise.
|
| 409 |
|
|
|
| 410 |
|
|
Complete the information missing in info.
|
| 411 |
|
|
*/
|
| 412 |
|
|
int umsdos_delentry (
|
| 413 |
|
|
struct inode *dir,
|
| 414 |
|
|
struct umsdos_info *info,
|
| 415 |
|
|
int isdir)
|
| 416 |
|
|
{
|
| 417 |
|
|
struct inode *emd_dir;
|
| 418 |
|
|
int ret = umsdos_find (dir,info,&emd_dir);
|
| 419 |
|
|
if (ret == 0){
|
| 420 |
|
|
if (info->entry.name_len != 0){
|
| 421 |
|
|
if ((isdir != 0) != (S_ISDIR(info->entry.mode) != 0)){
|
| 422 |
|
|
if (S_ISDIR(info->entry.mode)){
|
| 423 |
|
|
ret = -EISDIR;
|
| 424 |
|
|
}else{
|
| 425 |
|
|
ret = -ENOTDIR;
|
| 426 |
|
|
}
|
| 427 |
|
|
}else{
|
| 428 |
|
|
ret = umsdos_writeentry(dir,emd_dir,info,1);
|
| 429 |
|
|
}
|
| 430 |
|
|
}
|
| 431 |
|
|
}
|
| 432 |
|
|
iput(emd_dir);
|
| 433 |
|
|
return ret;
|
| 434 |
|
|
}
|
| 435 |
|
|
|
| 436 |
|
|
|
| 437 |
|
|
/*
|
| 438 |
|
|
Verify is a EMD directory is empty.
|
| 439 |
|
|
Return 0 if not empty
|
| 440 |
|
|
1 if empty
|
| 441 |
|
|
2 if empty, no EMD file.
|
| 442 |
|
|
*/
|
| 443 |
|
|
int umsdos_isempty (struct inode *dir)
|
| 444 |
|
|
{
|
| 445 |
|
|
int ret = 2;
|
| 446 |
|
|
struct inode *emd_dir = umsdos_emd_dir_lookup(dir,0);
|
| 447 |
|
|
/* If the EMD file does not exist, it is certainly empty :-) */
|
| 448 |
|
|
if (emd_dir != NULL){
|
| 449 |
|
|
struct file filp;
|
| 450 |
|
|
/* Find an empty slot */
|
| 451 |
|
|
filp.f_pos = 0;
|
| 452 |
|
|
filp.f_reada = 1;
|
| 453 |
|
|
filp.f_flags = O_RDONLY;
|
| 454 |
|
|
ret = 1;
|
| 455 |
|
|
while (filp.f_pos < emd_dir->i_size){
|
| 456 |
|
|
struct umsdos_dirent entry;
|
| 457 |
|
|
if (umsdos_emd_dir_readentry(emd_dir,&filp,&entry)!=0){
|
| 458 |
|
|
ret = 0;
|
| 459 |
|
|
break;
|
| 460 |
|
|
}else if (entry.name_len != 0){
|
| 461 |
|
|
ret = 0;
|
| 462 |
|
|
break;
|
| 463 |
|
|
}
|
| 464 |
|
|
}
|
| 465 |
|
|
iput (emd_dir);
|
| 466 |
|
|
}
|
| 467 |
|
|
return ret;
|
| 468 |
|
|
}
|
| 469 |
|
|
|
| 470 |
|
|
/*
|
| 471 |
|
|
Locate an entry in a EMD directory.
|
| 472 |
|
|
Return 0 if ok, errcod if not, generally -ENOENT.
|
| 473 |
|
|
*/
|
| 474 |
|
|
int umsdos_findentry (
|
| 475 |
|
|
struct inode *dir,
|
| 476 |
|
|
struct umsdos_info *info,
|
| 477 |
|
|
int expect) /* 0: anything */
|
| 478 |
|
|
/* 1: file */
|
| 479 |
|
|
/* 2: directory */
|
| 480 |
|
|
{
|
| 481 |
|
|
struct inode *emd_dir;
|
| 482 |
|
|
int ret = umsdos_find (dir,info,&emd_dir);
|
| 483 |
|
|
if (ret == 0){
|
| 484 |
|
|
if (expect != 0){
|
| 485 |
|
|
if (S_ISDIR(info->entry.mode)){
|
| 486 |
|
|
if (expect != 2) ret = -EISDIR;
|
| 487 |
|
|
}else if (expect == 2){
|
| 488 |
|
|
ret = -ENOTDIR;
|
| 489 |
|
|
}
|
| 490 |
|
|
}
|
| 491 |
|
|
}
|
| 492 |
|
|
iput (emd_dir);
|
| 493 |
|
|
return ret;
|
| 494 |
|
|
}
|
| 495 |
|
|
|
