592 lines
15 KiB
C
592 lines
15 KiB
C
/*
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* linux/fs/msdos/namei.c
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*
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* Written 1992,1993 by Werner Almesberger
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*/
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#include <asm/segment.h>
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#include <linux/sched.h>
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#include <linux/msdos_fs.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/stat.h>
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/* MS-DOS "device special files" */
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static char *reserved_names[] = {
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"CON ","PRN ","NUL ","AUX ",
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"LPT1 ","LPT2 ","LPT3 ","LPT4 ",
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"COM1 ","COM2 ","COM3 ","COM4 ",
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NULL };
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/* Characters that are undesirable in an MS-DOS file name */
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static char bad_chars[] = "*?<>|\"";
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static char bad_if_strict[] = "+=,; ";
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/* Formats an MS-DOS file name. Rejects invalid names. */
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static int msdos_format_name(char conv,const char *name,int len,char *res,
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int dot_dirs)
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{
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char *walk,**reserved;
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unsigned char c;
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int space;
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if (IS_FREE(name)) return -EINVAL;
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if (name[0] == '.' && (len == 1 || (len == 2 && name[1] == '.'))) {
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if (!dot_dirs) return -EEXIST;
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memset(res+1,' ',10);
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while (len--) *res++ = '.';
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return 0;
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}
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space = 1; /* disallow names starting with a dot */
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c = 0;
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for (walk = res; len && walk-res < 8; walk++) {
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c = *name++;
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len--;
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if (conv != 'r' && strchr(bad_chars,c)) return -EINVAL;
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if (conv == 's' && strchr(bad_if_strict,c)) return -EINVAL;
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if (c >= 'A' && c <= 'Z' && conv == 's') return -EINVAL;
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if (c < ' ' || c == ':' || c == '\\') return -EINVAL;
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if (c == '.') break;
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space = c == ' ';
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*walk = c >= 'a' && c <= 'z' ? c-32 : c;
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}
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if (space) return -EINVAL;
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if (conv == 's' && len && c != '.') {
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c = *name++;
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len--;
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if (c != '.') return -EINVAL;
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}
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while (c != '.' && len--) c = *name++;
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if (c == '.') {
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while (walk-res < 8) *walk++ = ' ';
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while (len > 0 && walk-res < MSDOS_NAME) {
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c = *name++;
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len--;
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if (conv != 'r' && strchr(bad_chars,c)) return -EINVAL;
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if (conv == 's' && strchr(bad_if_strict,c))
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return -EINVAL;
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if (c < ' ' || c == ':' || c == '\\' || c == '.')
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return -EINVAL;
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if (c >= 'A' && c <= 'Z' && conv == 's') return -EINVAL;
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space = c == ' ';
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*walk++ = c >= 'a' && c <= 'z' ? c-32 : c;
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}
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if (space) return -EINVAL;
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if (conv == 's' && len) return -EINVAL;
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}
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while (walk-res < MSDOS_NAME) *walk++ = ' ';
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for (reserved = reserved_names; *reserved; reserved++)
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if (!strncmp(res,*reserved,8)) return -EINVAL;
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return 0;
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}
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/* Locates a directory entry. */
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static int msdos_find(struct inode *dir,const char *name,int len,
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struct buffer_head **bh,struct msdos_dir_entry **de,int *ino)
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{
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char msdos_name[MSDOS_NAME];
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int res;
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if ((res = msdos_format_name(MSDOS_SB(dir->i_sb)->name_check,name,len,
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msdos_name,1)) < 0) return res;
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return msdos_scan(dir,msdos_name,bh,de,ino);
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}
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int msdos_lookup(struct inode *dir,const char *name,int len,
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struct inode **result)
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{
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int ino,res;
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struct msdos_dir_entry *de;
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struct buffer_head *bh;
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struct inode *next;
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*result = NULL;
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if (!dir) return -ENOENT;
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if (!S_ISDIR(dir->i_mode)) {
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iput(dir);
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return -ENOENT;
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}
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if (len == 1 && name[0] == '.') {
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*result = dir;
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return 0;
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}
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if (len == 2 && name[0] == '.' && name[1] == '.') {
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ino = msdos_parent_ino(dir,0);
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iput(dir);
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if (ino < 0) return ino;
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if (!(*result = iget(dir->i_sb,ino))) return -EACCES;
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return 0;
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}
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if ((res = msdos_find(dir,name,len,&bh,&de,&ino)) < 0) {
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iput(dir);
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return res;
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}
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if (bh) brelse(bh);
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/* printk("lookup: ino=%d\n",ino); */
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if (!(*result = iget(dir->i_sb,ino))) {
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iput(dir);
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return -EACCES;
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}
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if (MSDOS_I(*result)->i_busy) { /* mkdir in progress */
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iput(*result);
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iput(dir);
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return -ENOENT;
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}
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while (MSDOS_I(*result)->i_old) {
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next = MSDOS_I(*result)->i_old;
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iput(*result);
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if (!(*result = iget(next->i_sb,next->i_ino))) {
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fs_panic(dir->i_sb,"msdos_lookup: Can't happen");
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iput(dir);
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return -ENOENT;
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}
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}
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iput(dir);
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return 0;
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}
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/* Creates a directory entry (name is already formatted). */
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static int msdos_create_entry(struct inode *dir,char *name,int is_dir,
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struct inode **result)
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{
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struct buffer_head *bh;
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struct msdos_dir_entry *de;
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int res,ino;
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if ((res = msdos_scan(dir,NULL,&bh,&de,&ino)) < 0) {
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if (res != -ENOENT) return res;
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if (dir->i_ino == MSDOS_ROOT_INO) return -ENOSPC;
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if ((res = msdos_add_cluster(dir)) < 0) return res;
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if ((res = msdos_scan(dir,NULL,&bh,&de,&ino)) < 0) return res;
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}
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/*
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* XXX all times should be set by caller upon successful completion.
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*/
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dir->i_ctime = dir->i_mtime = CURRENT_TIME;
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dir->i_dirt = 1;
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memcpy(de->name,name,MSDOS_NAME);
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de->attr = is_dir ? ATTR_DIR : ATTR_ARCH;
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de->start = 0;
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date_unix2dos(dir->i_mtime,&de->time,&de->date);
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de->size = 0;
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bh->b_dirt = 1;
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if ((*result = iget(dir->i_sb,ino)) != NULL)
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msdos_read_inode(*result);
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brelse(bh);
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if (!*result) return -EIO;
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(*result)->i_mtime = (*result)->i_atime = (*result)->i_ctime =
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CURRENT_TIME;
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(*result)->i_dirt = 1;
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return 0;
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}
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int msdos_create(struct inode *dir,const char *name,int len,int mode,
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struct inode **result)
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{
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struct buffer_head *bh;
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struct msdos_dir_entry *de;
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char msdos_name[MSDOS_NAME];
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int ino,res;
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if (!dir) return -ENOENT;
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if ((res = msdos_format_name(MSDOS_SB(dir->i_sb)->name_check,name,len,
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msdos_name,0)) < 0) {
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iput(dir);
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return res;
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}
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lock_creation();
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if (msdos_scan(dir,msdos_name,&bh,&de,&ino) >= 0) {
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unlock_creation();
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brelse(bh);
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iput(dir);
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return -EEXIST;
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}
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res = msdos_create_entry(dir,msdos_name,S_ISDIR(mode),result);
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unlock_creation();
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iput(dir);
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return res;
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}
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#ifdef DEBUG
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static void dump_fat(struct super_block *sb,int start)
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{
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printk("[");
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while (start) {
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printk("%d ",start);
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start = fat_access(sb,start,-1);
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if (!start) {
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printk("ERROR");
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break;
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}
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if (start == -1) break;
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}
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printk("]\n");
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}
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#endif
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int msdos_mkdir(struct inode *dir,const char *name,int len,int mode)
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{
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struct buffer_head *bh;
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struct msdos_dir_entry *de;
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struct inode *inode,*dot;
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char msdos_name[MSDOS_NAME];
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int ino,res;
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if ((res = msdos_format_name(MSDOS_SB(dir->i_sb)->name_check,name,len,
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msdos_name,0)) < 0) {
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iput(dir);
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return res;
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}
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lock_creation();
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if (msdos_scan(dir,msdos_name,&bh,&de,&ino) >= 0) {
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unlock_creation();
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brelse(bh);
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iput(dir);
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return -EEXIST;
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}
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if ((res = msdos_create_entry(dir,msdos_name,1,&inode)) < 0) {
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unlock_creation();
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iput(dir);
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return res;
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}
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dir->i_nlink++;
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inode->i_nlink = 2; /* no need to mark them dirty */
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MSDOS_I(inode)->i_busy = 1; /* prevent lookups */
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if ((res = msdos_add_cluster(inode)) < 0) goto mkdir_error;
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if ((res = msdos_create_entry(inode,MSDOS_DOT,1,&dot)) < 0)
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goto mkdir_error;
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dot->i_size = inode->i_size; /* doesn't grow in the 2nd create_entry */
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MSDOS_I(dot)->i_start = MSDOS_I(inode)->i_start;
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dot->i_nlink = inode->i_nlink;
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dot->i_dirt = 1;
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iput(dot);
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if ((res = msdos_create_entry(inode,MSDOS_DOTDOT,1,&dot)) < 0)
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goto mkdir_error;
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unlock_creation();
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dot->i_size = dir->i_size;
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MSDOS_I(dot)->i_start = MSDOS_I(dir)->i_start;
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dot->i_nlink = dir->i_nlink;
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dot->i_dirt = 1;
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MSDOS_I(inode)->i_busy = 0;
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iput(dot);
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iput(inode);
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iput(dir);
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return 0;
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mkdir_error:
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iput(inode);
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if (msdos_rmdir(dir,name,len) < 0)
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fs_panic(dir->i_sb,"rmdir in mkdir failed");
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unlock_creation();
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return res;
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}
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static int msdos_empty(struct inode *dir)
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{
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off_t pos;
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struct buffer_head *bh;
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struct msdos_dir_entry *de;
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if (dir->i_count > 1)
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return -EBUSY;
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if (MSDOS_I(dir)->i_start) { /* may be zero in mkdir */
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pos = 0;
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bh = NULL;
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while (msdos_get_entry(dir,&pos,&bh,&de) > -1)
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if (!IS_FREE(de->name) && strncmp(de->name,MSDOS_DOT,
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MSDOS_NAME) && strncmp(de->name,MSDOS_DOTDOT,
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MSDOS_NAME)) {
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brelse(bh);
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return -ENOTEMPTY;
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}
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if (bh)
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brelse(bh);
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}
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return 0;
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}
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int msdos_rmdir(struct inode *dir,const char *name,int len)
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{
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int res,ino;
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struct buffer_head *bh;
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struct msdos_dir_entry *de;
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struct inode *inode;
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bh = NULL;
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inode = NULL;
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res = -EPERM;
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if (name[0] == '.' && (len == 1 || (len == 2 && name[1] == '.')))
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goto rmdir_done;
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if ((res = msdos_find(dir,name,len,&bh,&de,&ino)) < 0) goto rmdir_done;
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res = -ENOENT;
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if (!(inode = iget(dir->i_sb,ino))) goto rmdir_done;
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res = -ENOTDIR;
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if (!S_ISDIR(inode->i_mode)) goto rmdir_done;
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res = -EBUSY;
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if (dir->i_dev != inode->i_dev || dir == inode) goto rmdir_done;
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res = msdos_empty(inode);
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if (res)
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goto rmdir_done;
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inode->i_nlink = 0;
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inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
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dir->i_nlink--;
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inode->i_dirt = dir->i_dirt = 1;
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de->name[0] = DELETED_FLAG;
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bh->b_dirt = 1;
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res = 0;
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rmdir_done:
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brelse(bh);
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iput(dir);
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iput(inode);
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return res;
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}
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int msdos_unlink(struct inode *dir,const char *name,int len)
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{
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int res,ino;
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struct buffer_head *bh;
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struct msdos_dir_entry *de;
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struct inode *inode;
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bh = NULL;
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inode = NULL;
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if ((res = msdos_find(dir,name,len,&bh,&de,&ino)) < 0)
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goto unlink_done;
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if (!(inode = iget(dir->i_sb,ino))) {
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res = -ENOENT;
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goto unlink_done;
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}
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if (!S_ISREG(inode->i_mode)) {
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res = -EPERM;
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goto unlink_done;
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}
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inode->i_nlink = 0;
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inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
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MSDOS_I(inode)->i_busy = 1;
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inode->i_dirt = dir->i_dirt = 1;
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de->name[0] = DELETED_FLAG;
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bh->b_dirt = 1;
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unlink_done:
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brelse(bh);
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iput(inode);
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iput(dir);
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return res;
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}
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static int rename_same_dir(struct inode *old_dir,char *old_name,
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struct inode *new_dir,char *new_name,struct buffer_head *old_bh,
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struct msdos_dir_entry *old_de,int old_ino)
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{
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struct buffer_head *new_bh;
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struct msdos_dir_entry *new_de;
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struct inode *new_inode,*old_inode;
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int new_ino,exists,error;
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if (!strncmp(old_name,new_name,MSDOS_NAME)) return 0;
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exists = msdos_scan(new_dir,new_name,&new_bh,&new_de,&new_ino) >= 0;
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if (*(unsigned char *) old_de->name == DELETED_FLAG) {
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if (exists) brelse(new_bh);
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return -ENOENT;
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}
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if (exists) {
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if (!(new_inode = iget(new_dir->i_sb,new_ino))) {
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brelse(new_bh);
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return -EIO;
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}
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error = S_ISDIR(new_inode->i_mode) ? (old_de->attr & ATTR_DIR) ?
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msdos_empty(new_inode) : -EPERM : (old_de->attr & ATTR_DIR)
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? -EPERM : 0;
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if (error) {
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iput(new_inode);
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brelse(new_bh);
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return error;
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}
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if (S_ISDIR(new_inode->i_mode)) {
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new_dir->i_nlink--;
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new_dir->i_dirt = 1;
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}
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new_inode->i_nlink = 0;
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MSDOS_I(new_inode)->i_busy = 1;
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new_inode->i_dirt = 1;
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new_de->name[0] = DELETED_FLAG;
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new_bh->b_dirt = 1;
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iput(new_inode);
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brelse(new_bh);
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}
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memcpy(old_de->name,new_name,MSDOS_NAME);
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old_bh->b_dirt = 1;
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if (MSDOS_SB(old_dir->i_sb)->conversion == 'a') /* update binary info */
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if ((old_inode = iget(old_dir->i_sb,old_ino)) != NULL) {
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msdos_read_inode(old_inode);
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iput(old_inode);
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}
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return 0;
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}
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static int rename_diff_dir(struct inode *old_dir,char *old_name,
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struct inode *new_dir,char *new_name,struct buffer_head *old_bh,
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struct msdos_dir_entry *old_de,int old_ino)
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{
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struct buffer_head *new_bh,*free_bh,*dotdot_bh;
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struct msdos_dir_entry *new_de,*free_de,*dotdot_de;
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struct inode *old_inode,*new_inode,*free_inode,*dotdot_inode,*walk;
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int new_ino,free_ino,dotdot_ino;
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int error,exists,ino;
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if (old_dir->i_dev != new_dir->i_dev) return -EINVAL;
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if (old_ino == new_dir->i_ino) return -EINVAL;
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if (!(walk = iget(new_dir->i_sb,new_dir->i_ino))) return -EIO;
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while (walk->i_ino != MSDOS_ROOT_INO) {
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ino = msdos_parent_ino(walk,1);
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iput(walk);
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if (ino < 0) return ino;
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if (ino == old_ino) return -EINVAL;
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if (!(walk = iget(new_dir->i_sb,ino))) return -EIO;
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}
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iput(walk);
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while ((error = msdos_scan(new_dir,NULL,&free_bh,&free_de,&free_ino)) <
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0) {
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if (error != -ENOENT) return error;
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error = msdos_add_cluster(new_dir);
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if (error) return error;
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}
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exists = msdos_scan(new_dir,new_name,&new_bh,&new_de,&new_ino) >= 0;
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if (!(old_inode = iget(old_dir->i_sb,old_ino))) {
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brelse(free_bh);
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if (exists) brelse(new_bh);
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return -EIO;
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}
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if (*(unsigned char *) old_de->name == DELETED_FLAG) {
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iput(old_inode);
|
|
brelse(free_bh);
|
|
if (exists) brelse(new_bh);
|
|
return -ENOENT;
|
|
}
|
|
new_inode = NULL; /* to make GCC happy */
|
|
if (exists) {
|
|
if (!(new_inode = iget(new_dir->i_sb,new_ino))) {
|
|
iput(old_inode);
|
|
brelse(new_bh);
|
|
return -EIO;
|
|
}
|
|
error = S_ISDIR(new_inode->i_mode) ? (old_de->attr & ATTR_DIR) ?
|
|
msdos_empty(new_inode) : -EPERM : (old_de->attr & ATTR_DIR)
|
|
? -EPERM : 0;
|
|
if (error) {
|
|
iput(new_inode);
|
|
iput(old_inode);
|
|
brelse(new_bh);
|
|
return error;
|
|
}
|
|
new_inode->i_nlink = 0;
|
|
MSDOS_I(new_inode)->i_busy = 1;
|
|
new_inode->i_dirt = 1;
|
|
new_de->name[0] = DELETED_FLAG;
|
|
new_bh->b_dirt = 1;
|
|
}
|
|
memcpy(free_de,old_de,sizeof(struct msdos_dir_entry));
|
|
memcpy(free_de->name,new_name,MSDOS_NAME);
|
|
if (!(free_inode = iget(new_dir->i_sb,free_ino))) {
|
|
free_de->name[0] = DELETED_FLAG;
|
|
/* Don't mark free_bh as dirty. Both states are supposed to be equivalent. */
|
|
brelse(free_bh);
|
|
if (exists) {
|
|
iput(new_inode);
|
|
brelse(new_bh);
|
|
}
|
|
return -EIO;
|
|
}
|
|
if (exists && S_ISDIR(new_inode->i_mode)) {
|
|
new_dir->i_nlink--;
|
|
new_dir->i_dirt = 1;
|
|
}
|
|
msdos_read_inode(free_inode);
|
|
MSDOS_I(old_inode)->i_busy = 1;
|
|
cache_inval_inode(old_inode);
|
|
old_inode->i_dirt = 1;
|
|
old_de->name[0] = DELETED_FLAG;
|
|
old_bh->b_dirt = 1;
|
|
free_bh->b_dirt = 1;
|
|
if (!exists) iput(free_inode);
|
|
else {
|
|
MSDOS_I(new_inode)->i_depend = free_inode;
|
|
MSDOS_I(free_inode)->i_old = new_inode;
|
|
/* free_inode is put when putting new_inode */
|
|
iput(new_inode);
|
|
brelse(new_bh);
|
|
}
|
|
if (S_ISDIR(old_inode->i_mode)) {
|
|
if ((error = msdos_scan(old_inode,MSDOS_DOTDOT,&dotdot_bh,
|
|
&dotdot_de,&dotdot_ino)) < 0) goto rename_done;
|
|
if (!(dotdot_inode = iget(old_inode->i_sb,dotdot_ino))) {
|
|
brelse(dotdot_bh);
|
|
error = -EIO;
|
|
goto rename_done;
|
|
}
|
|
dotdot_de->start = MSDOS_I(dotdot_inode)->i_start =
|
|
MSDOS_I(new_dir)->i_start;
|
|
dotdot_inode->i_dirt = 1;
|
|
dotdot_bh->b_dirt = 1;
|
|
old_dir->i_nlink--;
|
|
new_dir->i_nlink++;
|
|
/* no need to mark them dirty */
|
|
dotdot_inode->i_nlink = new_dir->i_nlink;
|
|
iput(dotdot_inode);
|
|
brelse(dotdot_bh);
|
|
}
|
|
error = 0;
|
|
rename_done:
|
|
brelse(free_bh);
|
|
iput(old_inode);
|
|
return error;
|
|
}
|
|
|
|
|
|
int msdos_rename(struct inode *old_dir,const char *old_name,int old_len,
|
|
struct inode *new_dir,const char *new_name,int new_len)
|
|
{
|
|
char old_msdos_name[MSDOS_NAME],new_msdos_name[MSDOS_NAME];
|
|
struct buffer_head *old_bh;
|
|
struct msdos_dir_entry *old_de;
|
|
int old_ino,error;
|
|
|
|
if ((error = msdos_format_name(MSDOS_SB(old_dir->i_sb)->name_check,
|
|
old_name,old_len,old_msdos_name,1)) < 0) goto rename_done;
|
|
if ((error = msdos_format_name(MSDOS_SB(new_dir->i_sb)->name_check,
|
|
new_name,new_len,new_msdos_name,0)) < 0) goto rename_done;
|
|
if ((error = msdos_scan(old_dir,old_msdos_name,&old_bh,&old_de,
|
|
&old_ino)) < 0) goto rename_done;
|
|
lock_creation();
|
|
if (old_dir == new_dir)
|
|
error = rename_same_dir(old_dir,old_msdos_name,new_dir,
|
|
new_msdos_name,old_bh,old_de,old_ino);
|
|
else error = rename_diff_dir(old_dir,old_msdos_name,new_dir,
|
|
new_msdos_name,old_bh,old_de,old_ino);
|
|
unlock_creation();
|
|
brelse(old_bh);
|
|
rename_done:
|
|
iput(old_dir);
|
|
iput(new_dir);
|
|
return error;
|
|
}
|