--- /dev/null
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/mman.h>
+#include <sys/time.h>
+#include <assert.h>
+
+#include <errno.h>
+extern int errno;
+
+#include "file.h"
+
+#include "test3_aux.h"
+#include "memory.h"
+
+char *dstring="d\0";
+struct filedesc files[MAXFILES];
+struct InodeBitmap ib;
+struct BlockBitmap bb;
+
+int bbbptr; // pointer to the BlockBitmap block
+int ibbptr; // pointer to the InodeBlock block
+int itbptr; // pointer to the InodeTable block
+int rdiptr; // pointer to the RootDirectoryInode block
+
+struct InodeBitmap* sc_ib;
+struct BlockBitmap* sc_bb;
+struct InodeBlock* sc_it;
+int sc_bbbptr;
+int sc_ibbptr;
+int sc_itbptr;
+int sc_rdiptr;
+
+#include "SimpleHash.h"
+
+int testinode(int i) {
+ char temp;
+ assert(sc_ib);
+ temp = sc_ib->inode[i/8]&(1<<(i%8));
+ return temp == 0 ? 0 : 1;
+}
+
+int testblock(int i) {
+ char temp;
+ assert(sc_bb);
+ temp = sc_bb->blocks[i/8]&(1<<(i%8));
+ return temp == 0 ? 0 : 1;
+}
+
+unsigned long selfcheck2(struct block* d) {
+
+ struct timeval begin,end;
+ unsigned long t;
+ gettimeofday(&begin,NULL);
+
+#include "test3.cc"
+
+ gettimeofday(&end,NULL);
+ t=(end.tv_sec-begin.tv_sec)*1000000+end.tv_usec-begin.tv_usec;
+ return t;
+}
+
+void selfcheck(struct block* diskptr) {
+
+ /* get time information for statistics */
+ struct timeval begin,end;
+ unsigned long t;
+ gettimeofday(&begin,NULL);
+
+
+ /* hand written data structure consistency */
+
+ struct SuperBlock* sb = (struct SuperBlock*)&diskptr[0];
+ struct GroupBlock* gb = (struct GroupBlock*)&diskptr[1];
+
+ int numblocks = sb->NumberofBlocks;
+ int numinodes = sb->NumberofInodes;
+
+ SimpleHash* hash_inodeof = new SimpleHash(1000); // estimation of the number of files!
+ SimpleHash* hash_contents = new SimpleHash(1000); // contents
+ SimpleList* list_inodes = new SimpleList();
+ SimpleList* list_blocks = new SimpleList();
+
+ // simple test
+
+ // check bitmap consistency with superblock, groupblock, inotetableblock
+ // inodebitmapblock, blockbitmapblock, rootidrectoryinode
+
+ sc_bbbptr = gb->BlockBitmapBlock;
+ sc_ibbptr = gb->InodeBitmapBlock;
+ sc_itbptr = gb->InodeTableBlock;
+ sc_rdiptr = sb->RootDirectoryInode;
+
+ // constraint 8: automatic...
+ // constraint 9: automatic...
+
+ // constraint 10:
+ if (sc_itbptr < numblocks) {
+ sc_it = (InodeBlock*)&diskptr[sc_itbptr];
+ } else {
+ sc_it = NULL;
+ }
+
+ // constraint 11:
+ if (sc_ibbptr < numblocks) {
+ sc_ib = (InodeBitmap*)&diskptr[sc_ibbptr];
+ } else {
+ sc_ib = NULL;
+ }
+
+ // constraint 12:
+ if (sc_bbbptr < numblocks) {
+ sc_bb = (BlockBitmap*)&diskptr[sc_bbbptr];
+ } else {
+ sc_bb = NULL;
+ }
+
+ // rule 1
+ if (sc_bb) {
+ // constraint 3
+ assert(testblock(0)); // superblock
+
+ // building blocks
+ list_blocks->add(0);
+ }
+
+ // rule 2
+ if (sc_bb) {
+ // constraint 3
+ assert(testblock(1)); // groupblock
+
+ // building list_blocks
+ list_blocks->add(1);
+ }
+
+ // rule 3
+ if (sc_bb) {
+ // constraint 3
+ assert(testblock(sc_itbptr));
+
+ // building list_blocks
+ list_blocks->add(sc_itbptr);
+ }
+
+ // rule 4
+ if (sc_bb) {
+ // constraint 3
+ assert(testblock(sc_ibbptr));
+
+ // building list_blocks
+ list_blocks->add(sc_ibbptr);
+ }
+
+ // rule 5
+ if (sc_bb) {
+ // constraint 3
+ assert(testblock(sc_bbbptr));
+
+ // building list_blocks
+ list_blocks->add(sc_bbbptr);
+ }
+
+ // build inodeof and contents
+ if (sb->RootDirectoryInode < numinodes) {
+ int dinode = sb->RootDirectoryInode;
+
+ // building list_inodes
+ list_inodes->add(dinode);
+
+ for (int k = 0 ; k <= 11 ; k++) {
+
+ int block = sc_it->entries[dinode].Blockptr[k];
+
+ if (block != 0) {
+ hash_contents->add(dinode, block);
+ list_blocks->add(block);
+ }
+
+ if (block < numblocks) {
+
+ DirectoryBlock* db = (DirectoryBlock*)&diskptr[block];
+
+ for (int j = 0; j < sb->blocksize/128 ; j++) {
+
+ DirectoryEntry* de = (DirectoryEntry*)&db->entries[j];
+
+ if (de->inodenumber < numinodes) {
+ // add <de, de.inodenumber> to inodeof
+ hash_inodeof->add((int)de, de->inodenumber);
+ }
+
+ if (de->inodenumber < numinodes && de->inodenumber != 0) {
+
+ // build list_inodes
+ list_inodes->add(de->inodenumber);
+
+ for (int j2 = 0 ; j2 <= 11 ; j2++) {
+ int block2 = sc_it->entries[de->inodenumber].Blockptr[j2];
+ if (block2 != 0) {
+ hash_contents->add(de->inodenumber, block2);
+ if (block2 < numblocks) {
+ list_blocks->add(block2);
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+
+ //printf("\n");
+
+ // rule 6 and rule 11: rootdirectoryinode
+ if (sb->RootDirectoryInode < numinodes) {
+ int inode = sb->RootDirectoryInode;
+
+ // constraint 1
+ assert(testinode(inode));
+
+ int filesize = sc_it->entries[inode].filesize;
+ int contents = 0;
+ for (int j = 0; j <= 11; j++) {
+ int block2 = sc_it->entries[inode].Blockptr[j];
+ if (block2 != 0) {
+ // TBD: needs to actual store state because
+ // there could be duplicate numbers and they
+ // shouldn't be double counted
+ contents++;
+
+ // rule 11
+ if (block2 < numblocks) {
+ // constraint 3
+ assert(testblock(block2));
+
+ // constraint 7
+ //printf("%d - %d %d %d\n", inode, j, block2, hash_contents->countdata(block2));
+ assert(hash_contents->countdata(block2)==1);
+ }
+ }
+ }
+
+ // constraint 6
+ assert(filesize <= (contents*8192));
+
+ // constraint 5:
+ assert(sc_it->entries[inode].referencecount == hash_inodeof->countdata(inode));
+ }
+
+ // rule 14
+ if (sb->RootDirectoryInode < numinodes) {
+ int dinode = sb->RootDirectoryInode;
+
+ for (int j = 0; j < sb->blocksize/128 ; j++) {
+ for (int k = 0 ; k <= 11 ; k++) {
+ int block = sc_it->entries[dinode].Blockptr[k];
+ if (block < numblocks) {
+ DirectoryBlock* db = (DirectoryBlock*)&diskptr[block];
+ DirectoryEntry* de = (DirectoryEntry*)&db->entries[j];
+
+ int inode = de->inodenumber;
+ if (inode < numinodes && inode != 0) {
+
+ // constraint 1
+ assert(testinode(inode));
+
+ // constraint 6
+ int filesize = sc_it->entries[inode].filesize;
+ int contents = 0;
+ for (int j2 = 0; j2 <= 11; j2++) {
+ int block2 = sc_it->entries[inode].Blockptr[j2];
+ if (block2 != 0) {
+ // TBD
+ contents++;
+
+ // rule 11
+ if (block2 < numblocks) {
+ // constraint 3
+ assert(testblock(block2));
+
+ // constraint 7
+ assert(hash_contents->countdata(block2)==1);
+ }
+ }
+ }
+ assert(filesize <= (contents*8192));
+
+ // constraint 5:
+ assert(sc_it->entries[inode].referencecount == hash_inodeof->countdata(inode));
+ }
+ }
+ }
+ }
+ }
+
+ // to go, [7, 8 ]
+ // interesting question is going to be how to deal with 7 and 8
+ // actually it turns out that the constraints bound to rules 7 and 8 are
+ // easy... its just that creating the lists for 7 and 8 is a little tricky...
+ // 7 can easily piggyback on the creation of inodeof/contents... it fits quite
+ // nicely into that traversal... same goes for 8
+
+ // rule 7
+ for (int i = 0 ; i < numinodes ; i++) {
+ if (!list_inodes->contains(i)) {
+ // constraint 2
+ if (testinode(i)) {
+ printf("<bad inode,%d>", i);
+ assert(testinode(i)==0);
+ }
+ }
+ }
+
+ // rule 8
+ for (int i = 0 ; i < numblocks ; i++) {
+ if (!list_blocks->contains(i)) {
+ // constraint 4
+ if (testblock(i)) {
+ printf("<bad block,%d>", i);
+ assert(testblock(i)==0);
+ }
+
+ }
+ }
+
+
+ gettimeofday(&end,NULL);
+ t=(end.tv_sec-begin.tv_sec)*1000000+end.tv_usec-begin.tv_usec;
+
+ printf("\npassed tests in %ld u-seconds!\n", t);
+
+
+}
+
+
+int main(int argc, char **argv)
+{
+ initializemmap();
+
+ for(int i=0;i<MAXFILES;i++)
+ files[i].used=false;
+
+
+ if (argc <= 1) {
+ printf("Filesystem Repair:\n\tusage: main [0..9]\n\n");
+ printf("\t 0 : creates disk\n");
+ printf("\t 1 : mount disk, creates files and writes test data\n");
+ printf("\t 2 : \n");
+ printf("\t 3 : inserts errors to break specs\n");
+ printf("\t 4 : \n");
+ printf("\t 5 : \n");
+ printf("\t 6 : \n");
+ printf("\t 7 : \n");
+ printf("\t 8 : \n");
+ printf("\t 9 : \n");
+ exit(-1);
+ }
+
+ switch(argv[1][0]) {
+
+ case '0':
+ //creates a disk
+ createdisk();
+ return 1;
+
+
+ case '1': {
+ /* mounts the disk, creates NUMFILES files, and writes "buf" in each file
+ for 90 times */
+ struct block * ptr=mountdisk("disk");
+
+ for(int i=0; i<NUMFILES; i++) {
+ char filename[10];
+ sprintf(filename,"file_%d",i);
+ openfile(ptr,filename);
+ }
+
+ for(int j=0; j<90; j++) {
+ for(int i=0; i<NUMFILES; i++) {
+ char *buf="01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123";
+ writefile(ptr,i,buf,122);
+ }
+ }
+
+ for(int i=0; i<NUMFILES; i++) {
+ closefile(ptr,i);
+ }
+
+ printdirectory(ptr);
+ printinodeblock(ptr);
+
+ unmountdisk(ptr);
+ break;
+ }
+
+
+ case 'r': {
+ struct block * ptr=mountdisk("disk");
+
+ printdirectory(ptr);
+ printinodeblock(ptr);
+
+ // check the DSs
+ unsigned long time = 0;
+ for (int i = 0; i < 50; i++) {
+ // time += benchmark();
+ }
+
+ printf("\ninterpreted: %u us\n", (time/50));
+
+ break;
+ }
+
+ case 's': {
+ struct block * ptr=mountdisk("disk");
+
+ printdirectory(ptr);
+ printinodeblock(ptr);
+
+ // check the DSs
+ selfcheck(ptr);
+
+
+ break;
+ }
+
+ case 'x': {
+ struct block * ptr=mountdisk("disk");
+
+ printdirectory(ptr);
+ printinodeblock(ptr);
+
+ // check the DSs
+ // check the DSs
+ unsigned long time = 0;
+
+ time += selfcheck2(ptr);
+
+ printf("\ncompiled: %u us\n", (time/50));
+
+ break;
+ }
+
+
+ // insert errors that break the specs
+
+ case '5': {
+ // prints the directory structure, and prints the contents of each file
+ struct block * ptr=mountdisk("disk");
+ printdirectory(ptr);
+ for(int i=1; i<NUMFILES; i++) {
+ char filename[10];
+ sprintf(filename,"file_%d",i);
+ printfile(filename,ptr);
+ }
+ unmountdisk(ptr);
+ break;
+ }
+
+ case '6': {
+ // the same as "case '1'" only that the files are accessed in reversed order
+ struct block * ptr=mountdisk("disk");
+ for(int i=NUMFILES; i>1; i--) {
+ char filename[10];
+ sprintf(filename,"file_%d",i);
+ openfile(ptr,filename);
+ }
+ for(int j=0; j<90; j++) {
+ for(int i=NUMFILES; i>1; i--) {
+ char *buf="01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123";
+ writefile(ptr,i,buf,122);
+ }
+ }
+ for(int i=NUMFILES; i>1; i--) {
+ closefile(ptr,i);
+ }
+ unmountdisk(ptr);
+ break;
+ }
+
+ case '7': {
+ struct block * ptr=mountdisk("disk");
+ for(int i=NUMFILES; i>=0; i--) {
+ char filename[10];
+ sprintf(filename,"file_%d",i);
+ openfile(ptr,filename);
+ }
+
+ for(int j=0;j<6000;j++) {
+ for(int i=NUMFILES; i>=0; i--) {
+ char name[10];
+ int len=sprintf(name, "%d ",i);
+ writefile(ptr,i,name,len);
+ }
+ }
+ for(int i=NUMFILES; i>=0; i--) {
+ closefile(ptr,i);
+ }
+ for(int i=NUMFILES; i>=0; i--) {
+ char filename[10];
+ sprintf(filename,"file_%d",i);
+ openfile(ptr,filename);
+ }
+
+ for(int j=0;j<400;j++) {
+ for(int i=NUMFILES; i>=0; i--) {
+ int l=0;
+ char name[10];
+ int len=sprintf(name, "%d ",i);
+ readfile(ptr,i,name,len);
+ sscanf(name, "%d ", &l);
+ if (l!=i) {
+ printf("ERROR in benchmark\n");
+ }
+ }
+ }
+ for(int i=NUMFILES; i>=0; i--) {
+ closefile(ptr,i);
+ }
+ unmountdisk(ptr);
+ }
+ break;
+
+
+ case '8': {
+ {
+ struct block * ptr=chmountdisk("disk");
+ chunmountdisk(ptr);
+ }
+ struct block * ptr=mountdisk("disk");
+ for(int i=NUMFILES; i>=0; i--) {
+ char filename[10];
+ sprintf(filename,"file_%d",i);
+ openfile(ptr,filename);
+ }
+ for(int j=0; j<6000; j++) {
+ for(int i=NUMFILES; i>=0; i--) {
+ char name[10];
+ int len=sprintf(name, "%d ",i);
+ writefile(ptr,i,name,len);
+ }
+ }
+ for(int i=NUMFILES; i>=0; i--) {
+ closefile(ptr,i);
+ }
+ for(int i=NUMFILES; i>=0; i--) {
+ char filename[10];
+ sprintf(filename,"file_%d",i);
+ openfile(ptr,filename);
+ }
+ for(int j=0;j<400;j++) {
+ for(int i=NUMFILES; i>=0; i--) {
+ int l=0;
+ char name[10];
+ int len=sprintf(name, "%d ",i);
+ readfile(ptr,i,name,len);
+ sscanf(name, "%d ", &l);
+ if (l!=i) {
+ printf("ERROR in benchmark\n");
+ }
+ }
+ }
+ for(int i=NUMFILES; i>=0; i--) {
+ closefile(ptr,i);
+ }
+ unmountdisk(ptr);
+ }
+
+ case '9': {
+ for(int i=0;i<MAXFILES;i++)
+ files[i].used=false;
+
+
+ struct block * ptr=mountdisk("disk");
+
+ for(int i=0; i<NUMFILES; i++)
+ {
+ char filename[10];
+ sprintf(filename,"file_%d", i);
+ openfile(ptr,filename);
+ }
+
+ for(int i=0; i<NUMFILES; i++)
+ {
+ char buf[100];
+ sprintf(buf,"This is file_%d.", i);
+ writefile(ptr,i,buf,strlen(buf));
+ }
+
+
+ createlink(ptr, "file_1", "link_1");
+ createlink(ptr, "file_1", "link_2");
+
+ removefile("file_1", ptr);
+
+ int fd = openfile(ptr, "new");
+ writefile(ptr, fd, "new", 3);
+
+ printfile("file_1", ptr);
+ printfile("link_1", ptr);
+ printfile("link_2", ptr);
+
+ for(int i=0; i<NUMFILES; i++)
+ closefile(ptr,i);
+
+
+ unmountdisk(ptr);
+ }
+
+ }
+}
+
+
+
+struct block * chmountdisk(char *filename) {
+ int fd=open(filename,O_CREAT|O_RDWR);
+ struct block *ptr=(struct block *) mmap(NULL,LENGTH,PROT_READ|PROT_WRITE|PROT_EXEC,MAP_SHARED,fd,0);
+ alloc(ptr,LENGTH);
+ return ptr;
+}
+
+
+
+void chunmountdisk(struct block *vptr) {
+ int val=munmap(vptr,LENGTH);
+ dealloc(vptr);
+ if (val!=0)
+ printf("Error!\n");
+}
+
+
+
+// mounts the disk from the file "filename"
+struct block * mountdisk(char *filename) {
+ int fd=open(filename,O_CREAT|O_RDWR);
+ struct block *ptr=(struct block *) mmap(NULL,LENGTH,PROT_READ|PROT_WRITE|PROT_EXEC,MAP_SHARED,fd,0);
+ alloc(ptr,LENGTH);
+ // droy: debugging
+ if ((int)ptr == -1) {
+ perror("mountdisk\0");
+ exit(-1);
+ }
+
+
+ struct SuperBlock *sb=(struct SuperBlock *) &ptr[0];
+ struct GroupBlock *gb=(struct GroupBlock *) &ptr[1];
+ bbbptr=gb->BlockBitmapBlock;
+ ibbptr=gb->InodeBitmapBlock;
+ itbptr=gb->InodeTableBlock;
+ rdiptr=sb->RootDirectoryInode;
+
+ struct InodeBitmap *ibb=(struct InodeBitmap *) &ptr[ibbptr];
+ for(int i=0;i<(NUMINODES/8+1);i++)
+ ib.inode[i]=ibb->inode[i];
+
+ struct BlockBitmap *bbb=(struct BlockBitmap *) &ptr[bbbptr];
+ for(int i=0;i<(NUMBLOCK/8+1);i++)
+ bb.blocks[i]=bbb->blocks[i];
+
+ printf("Disk mounted successfully from the file %s\n", filename);
+ fflush(NULL);
+
+ return ptr;
+}
+
+
+
+void unmountdisk(struct block *vptr) {
+ struct InodeBitmap *ibb=(struct InodeBitmap *) &vptr[ibbptr];
+ for(int i=0;i<(NUMINODES/8+1);i++)
+ ibb->inode[i]=ib.inode[i];
+
+ struct BlockBitmap *bbb=(struct BlockBitmap *) &vptr[bbbptr];
+ for(int i=0;i<(NUMBLOCK/8+1);i++)
+ bbb->blocks[i]=bb.blocks[i];
+ int val=munmap(vptr,LENGTH);
+ dealloc(vptr);
+ if (val!=0)
+ printf("Error!\n");
+}
+
+
+void removefile(char *filename, struct block *ptr) {
+ struct InodeBlock * itb=(struct InodeBlock *) &ptr[itbptr];
+ for(int i=0;i<12;i++) {
+ struct DirectoryBlock *db=(struct DirectoryBlock *) &ptr[itb->entries[rdiptr].Blockptr[i]];
+ for(int j=0;j<BLOCKSIZE/128;j++) {
+ if (db->entries[j].name[0]!=0) {
+ if(strcmp(filename,db->entries[j].name)==0) {
+ /* Found file */
+ db->entries[j].name[0]=0; //Delete entry
+ int inode=db->entries[j].inodenumber;
+ db->entries[j].inodenumber=0;
+
+ struct InodeBlock * itb=(struct InodeBlock *) &ptr[itbptr];
+ itb->entries[inode].referencecount--;
+
+ if (itb->entries[inode].referencecount==0) {
+ for(int i=0;i<((itb->entries[inode].filesize+BLOCKSIZE-1)/BLOCKSIZE);i++) {
+ int blocknum=itb->entries[inode].Blockptr[i];
+ bb.blocks[blocknum/8]^=(1<<(blocknum%8));
+ }
+ ib.inode[inode/8]^=(1<<(inode%8));
+ }
+ }
+ }
+ }
+ }
+}
+
+
+void createlink(struct block *ptr,char *filename, char *linkname) {
+ struct InodeBlock * itb=(struct InodeBlock *) &ptr[itbptr];
+ for(int i=0;i<12;i++) {
+ struct DirectoryBlock *db=(struct DirectoryBlock *) &ptr[itb->entries[rdiptr].Blockptr[i]];
+ for(int j=0;j<BLOCKSIZE/DIRECTORYENTRYSIZE;j++) {
+ if (db->entries[j].name[0]!=0) {
+ if(strcmp(filename,db->entries[j].name)==0) {
+ /* Found file */
+ int inode=db->entries[j].inodenumber;
+ struct InodeBlock * itb=(struct InodeBlock *) &ptr[4];
+ itb->entries[inode].referencecount++;
+ addtode(ptr, inode, linkname);
+ }
+ }
+ }
+ }
+}
+
+
+void closefile(struct block *ptr, int fd) {
+ struct InodeBlock * itb=(struct InodeBlock *) &ptr[4];
+
+
+ msync(&itb->entries[fd],sizeof(DirectoryEntry),MS_SYNC);
+ files[fd].used=false;
+}
+
+
+bool writefile(struct block *ptr, int fd, char *s) {
+ return (writefile(ptr,fd,s,1)==1);
+}
+
+
+int writefile(struct block *ptr, int fd, char *s, int len) {
+ struct filedesc *tfd=&files[fd];
+ if (tfd->used==false)
+ return -1;
+ struct InodeBlock * itb=(struct InodeBlock *) &ptr[4];
+ int filelen=itb->entries[tfd->inode].filesize;
+ if ((12*BLOCKSIZE-tfd->offset)<len)
+ len=12*BLOCKSIZE-tfd->offset;
+ for(int i=0;i<len;i++) {
+ int nbuffer=tfd->offset/BLOCKSIZE;
+ int noffset=tfd->offset%BLOCKSIZE;
+ if (tfd->offset>=filelen) {
+ if (noffset==0) {
+ int bptr=getblock(ptr);
+ if (bptr==-1) {
+ if (itb->entries[files[fd].inode].filesize<files[fd].offset)
+ itb->entries[files[fd].inode].filesize=files[fd].offset;
+ return i;
+ }
+ itb->entries[tfd->inode].Blockptr[nbuffer]=bptr;
+ }
+ }
+ int block=itb->entries[tfd->inode].Blockptr[nbuffer];
+ char *fchar=(char *)&ptr[block];
+ int tocopy=len-i;
+ if (tocopy>(BLOCKSIZE-noffset))
+ tocopy=BLOCKSIZE-noffset;
+ memcpy(&fchar[noffset],&s[i],tocopy);
+ msync(&fchar[noffset],tocopy,MS_SYNC);
+ i+=tocopy;
+ tfd->offset+=tocopy;
+ }
+ if (itb->entries[files[fd].inode].filesize<files[fd].offset)
+ itb->entries[files[fd].inode].filesize=files[fd].offset;
+ return len;
+}
+
+
+// reads one char from the file fd and returns it
+char readfile(struct block *ptr, int fd) {
+ char array[1];
+ if (readfile(ptr,fd,array,1)==1)
+ return array[0];
+ else
+ return EOF;
+}
+
+// reads len chars from file fd (file system *ptr) and returns them in buf
+int readfile(struct block *ptr, int fd, char *buf, int len) {
+ struct filedesc *tfd=&files[fd];
+ if (tfd->used==false)
+ return -1;
+
+ struct InodeBlock * itb=(struct InodeBlock *) &ptr[itbptr];
+ int filelen=itb->entries[tfd->inode].filesize;
+
+ // if there are fewer than len chars left, read until the end
+ if ((filelen-tfd->offset)<len)
+ len=filelen-tfd->offset;
+
+ for(int i=0;i<len;) {
+ int nbuffer=tfd->offset/BLOCKSIZE;
+ int noffset=tfd->offset%BLOCKSIZE;
+ int block=itb->entries[tfd->inode].Blockptr[nbuffer];
+ char *fchar=(char *)&ptr[block];
+ int tocopy=len-i;
+ if (tocopy>(BLOCKSIZE-noffset))
+ tocopy=BLOCKSIZE-noffset;
+ memcpy(&buf[i],&fchar[noffset],tocopy);
+ i+=tocopy;
+ tfd->offset+=tocopy;
+ }
+ return len;
+}
+
+
+
+int openfile(struct block *ptr, char *filename) {
+ /* Locate fd */
+ int fd=-1;
+ for(int k=0;k<MAXFILES;k++) {
+ if(!files[k].used) {
+ /* Found file */
+ fd=k;
+ files[fd].used=true;
+ break;
+ }
+ }
+ if (fd==-1) return fd;
+
+ /* Check to see if file exists*/
+ struct InodeBlock * itb=(struct InodeBlock *) &ptr[itbptr];
+ for(int i=0;i<12;i++)
+ {
+ struct DirectoryBlock *db=(struct DirectoryBlock *) &ptr[itb->entries[rdiptr].Blockptr[i]];
+ for(int j=0;j<BLOCKSIZE/DIRECTORYENTRYSIZE;j++)
+ {
+ if (db->entries[j].name[0]!=0) {
+ if(strcmp(filename, db->entries[j].name)==0)
+ {
+ files[fd].inode=db->entries[j].inodenumber;
+ files[fd].offset=0;
+ return fd;
+ }
+ }
+ }
+ }
+
+ /* If file doesn't exist, create it */
+ int inode=getinode(ptr);
+ if (inode==-1) {
+ files[fd].used=false;
+ return -1;
+ }
+ itb->entries[inode].filesize=0;
+ itb->entries[inode].referencecount=1;
+ for (int i=0;i<12;i++)
+ itb->entries[inode].Blockptr[i]=0;
+
+ addtode(ptr, inode, filename);
+ files[fd].inode=inode;
+ files[fd].offset=0;
+ return fd;
+}
+
+
+void createfile(struct block *ptr,char *filename, char *buf,int buflen) {
+ int fd=openfile(ptr,filename);
+ writefile(ptr,fd,buf,buflen);
+ closefile(ptr,fd);
+}
+
+
+
+// adds a file to the directory entry
+void addtode(struct block *ptr, int inode, char *filename) {
+ struct InodeBlock * itb=(struct InodeBlock *) &ptr[itbptr];
+ for(int i=0;i<12;i++) {
+ struct DirectoryBlock *db=(struct DirectoryBlock *) &ptr[itb->entries[rdiptr].Blockptr[i]];
+ for(int j=0;j<BLOCKSIZE/DIRECTORYENTRYSIZE;j++) {
+ if (db->entries[j].name[0]==0) {
+ /* lets finish */
+ strncpy(db->entries[j].name,filename,124);
+ db->entries[j].inodenumber=inode;
+ msync(&db->entries[j],sizeof(DirectoryEntry),MS_SYNC);
+ return;
+ }
+ }
+ }
+}
+
+
+// return the first free node in the InodeTable. Marks that inode as used.
+int getinode(struct block *ptr) {
+ for(int i=0;i<NUMINODES;i++) {
+ if (!(ib.inode[i/8]&(1<<(i%8)))) {
+ ib.inode[i/8]=ib.inode[i/8]|(1<<(i%8));
+ return i;
+ }
+ }
+ return -1;
+}
+
+
+int getblock(struct block * ptr) {
+ for(int i=0;i<NUMBLOCK;i++) {
+ if (!(bb.blocks[i/8]&(1<<(i%8)))) {
+ bb.blocks[i/8]=bb.blocks[i/8]|(1<<(i%8));
+ return i;
+ }
+ }
+ return -1;
+}
+
+
+
+void createdisk()
+{
+ int blocksize=BLOCKSIZE;
+ int numblocks=NUMBLOCK;
+
+ int fd=open("disk",O_CREAT|O_RDWR|O_TRUNC, S_IREAD|S_IWRITE);
+
+ // creates numblocks and initializes them with 0
+ char *buf=(char *)calloc(1,blocksize);
+ for(int i=0;i<numblocks;i++) {
+ write(fd,buf,blocksize);
+ }
+ free(buf);
+
+ // maps the file 'disk' into memory
+ void *vptr=mmap(NULL,LENGTH,PROT_READ|PROT_WRITE|PROT_EXEC,MAP_SHARED,fd,0);
+ alloc(vptr,LENGTH);
+ // added by dan roy for debugging
+ if ((int)vptr == -1) {
+ perror("createdisk()\0");
+ exit(-1);
+ }
+ // end dan roy
+
+ struct block *ptr=(struct block *)vptr;
+ {
+ struct SuperBlock * sb=(struct SuperBlock*) &ptr[0];
+ sb->FreeBlockCount=NUMBLOCK-5;
+ sb->FreeInodeCount=NUMINODES-1;
+ sb->NumberofInodes=NUMINODES;
+ sb->NumberofBlocks=NUMBLOCK;
+ sb->RootDirectoryInode=0;
+ sb->blocksize=BLOCKSIZE;
+ }
+ {
+ struct GroupBlock * gb=(struct GroupBlock *) &ptr[1];
+ gb->BlockBitmapBlock=2;
+ gb->InodeBitmapBlock=3;
+ gb->InodeTableBlock=4;
+ gb->GroupFreeBlockCount=NUMBLOCK-5;
+ gb->GroupFreeInodeCount=NUMINODES-1;
+ }
+ {
+ struct BlockBitmap * bb=(struct BlockBitmap *) &ptr[2];
+ //memset(bb, 0, sizeof(BlockBitmap));
+ for(int i=0;i<(5+12);i++) {
+ bb->blocks[i/8]=bb->blocks[i/8]|(1<<(i%8));
+ }
+ }
+ {
+ struct InodeBitmap * ib=(struct InodeBitmap *) &ptr[3];
+ //memset(ib, 0, sizeof(InodeBitmap));
+ ib->inode[0]=1;
+ }
+ {
+ struct InodeBlock * itb=(struct InodeBlock *) &ptr[4];
+
+ itb->entries[0].filesize=12*BLOCKSIZE;
+ for(int i=0;i<12;i++)
+ itb->entries[0].Blockptr[i]=i+5; // blocks 5 to 16 are RootDirectory entries
+ itb->entries[0].referencecount=0;
+ }
+
+ int val=munmap(vptr,LENGTH);
+ dealloc(vptr);
+ if (val!=0)
+ printf("Error!\n");
+
+ printf("Disk created successfully!\n");
+}
+
+
+void printdirectory(struct block *ptr)
+{
+ struct InodeBlock *itb=(struct InodeBlock *) &ptr[itbptr];
+
+ for(int i=0;i<12;i++)
+ {
+ struct DirectoryBlock *db=(struct DirectoryBlock *) &ptr[itb->entries[rdiptr].Blockptr[i]];
+
+ for(int j=0;j<BLOCKSIZE/DIRECTORYENTRYSIZE;j++) {
+ if (db->entries[j].name[0]!=0)
+ {
+ /* lets finish */
+ //printf("%s %d\n",db->entries[j].name, db->entries[j].inodenumber);
+ printf("%s (inode %d) (%d bytes)\n",db->entries[j].name, db->entries[j].inodenumber, itb->entries[db->entries[j].inodenumber].filesize);
+ }
+ }
+ }
+
+ //printf("end of printdirectory\n");
+}
+
+// prints the contents of the file with filename "filename"
+void printfile(char *filename, struct block *ptr)
+{
+ printf("=== BEGIN of %s ===\n", filename);
+ struct InodeBlock * itb=(struct InodeBlock *) &ptr[itbptr];
+ for(int i=0;i<12;i++) {
+ struct DirectoryBlock *db=(struct DirectoryBlock *) &ptr[itb->entries[rdiptr].Blockptr[i]];
+ for(int j=0;j<BLOCKSIZE/DIRECTORYENTRYSIZE;j++) {
+ if (db->entries[j].name[0]!=0) {
+ if(strcmp(filename,db->entries[j].name)==0) {
+ /* Found file */
+ int inode=db->entries[j].inodenumber;
+
+ struct InodeBlock * itb=(struct InodeBlock *) &ptr[itbptr];
+ for(int i=0;i<((itb->entries[inode].filesize+BLOCKSIZE-1)/BLOCKSIZE);i++) {
+ struct block *b=&ptr[itb->entries[inode].Blockptr[i]];
+ write(0,b,BLOCKSIZE);
+ }
+ }
+ }
+ }
+ }
+ printf("\n=== END of %s ===\n", filename);
+}
+
+
+void printinodeblock(struct block *ptr)
+{
+ struct InodeBlock *itb=(struct InodeBlock *) &ptr[itbptr];
+
+ for (int i=0; i<NUMINODES; i++)
+ {
+ Inode inode = itb->entries[i];
+ printf("inode %d: (filesize %d), (referencecount %d)\n", i, inode.filesize, inode.referencecount);
+ }
+}
+
+
projects / repair.git / commitdiff