mkfs.mfs: double indirect block support
. allows >4MB files for default 4k block size Change-Id: I09277fc3704fac1a44af82202c11435dc7ae8d55
This commit is contained in:
Ben Gras
parent
f497d9b9c4
commit
236a320240
@ -39,6 +39,8 @@
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#endif
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#include <dirent.h>
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#undef EXTERN
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#define EXTERN /* get rid of EXTERN by making it null */
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#include "super.h"
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@ -56,6 +58,9 @@
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#define INODE_MAX ((unsigned) 65535)
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#define SECTOR_SIZE 512
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/* inode block indexes pointing to single and double indirect block */
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#define S_INDIRECT_IDX (V2_NR_DZONES)
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#define D_INDIRECT_IDX (V2_NR_DZONES+1)
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#if !defined(__minix)
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#define mul64u(a,b) ((a) * (b))
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@ -289,11 +294,7 @@ char *argv[];
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if (blocks == 0) pexit("Can't open prototype file");
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}
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if (i == 0) {
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#if defined(__minix)
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uint32_t kb = div64u(mul64u(blocks, block_size), 1024);
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#else
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uint32_t kb = ((unsigned long long) blocks * block_size) / 1024;
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#endif
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i = kb / 2;
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if (kb >= 100000) i = kb / 4;
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@ -393,6 +394,7 @@ printf("testb = 0x%x 0x%x 0x%x\n", testb[0], testb[1], testb[block_size-1]);
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*===============================================================*/
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void detect_fs_size(struct fs_size * fssize)
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{
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int prev_lct = lct;
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uint32_t point = ftell(proto);
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fssize->inocount = 1; /* root directory node */
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@ -409,6 +411,7 @@ void detect_fs_size(struct fs_size * fssize)
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initb += (fssize->inocount + inodes_per_block - 1) / inodes_per_block;
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fssize->blockcount = initb+ fssize->zonecount;
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lct = prev_lct;
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fseek(proto, point, SEEK_SET);
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}
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@ -420,10 +423,17 @@ void sizeup_dir(struct fs_size * fssize)
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size_t size;
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int dir_entries = 2;
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zone_t dir_zones = 0;
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zone_t nr_dzones;
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zone_t nr_dzones, nr_indirzones;
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/* how many data blocks are addressed using a single indirect block? */
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int indir_addressed = V2_INDIRECTS(block_size);
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/* number of file zones we can address directly from the inode */
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nr_dzones = V2_NR_DZONES;
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/* number of file zones we can address directly and with a single indirect */
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nr_indirzones = V2_NR_DZONES + indir_addressed;
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while (1) {
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getline(line, token);
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p = token[0];
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@ -453,6 +463,7 @@ void sizeup_dir(struct fs_size * fssize)
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progname, token[4], strerror(errno));
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pexit("dynamic size detection failed");
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} else {
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int indirects = 0;
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if (fseek(f, 0, SEEK_END) < 0) {
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fprintf(stderr, "%s: Can't seek to end of %s\n",
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progname, token[4]);
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@ -460,12 +471,21 @@ void sizeup_dir(struct fs_size * fssize)
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}
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size = ftell(f);
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fclose(f);
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zone_t fzones= (size / block_size);
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if (size % block_size)
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fzones++;
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zone_t fzones= roundup(size, block_size) / block_size;
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if (fzones > nr_dzones)
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fzones++; /* Assumes files fit within single indirect */
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fssize->zonecount += fzones;
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indirects++; /* single indirect needed */
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if (fzones > nr_indirzones) {
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int dindirect = 0;
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int dindirzones = fzones - nr_indirzones;
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/* how many zones needed to point to data
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* blocks?
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*/
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dindirect = 1 + roundup(dindirzones,
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indir_addressed) / indir_addressed;
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indirects += dindirect;
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}
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fssize->zonecount += fzones + indirects;
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}
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}
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}
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@ -829,10 +849,10 @@ void enter_dir(ino_t parent, char const *name, ino_t child)
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}
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/* no space in directory using just direct blocks; try indirect */
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if (ino->d2_zone[V2_NR_DZONES] == 0)
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ino->d2_zone[V2_NR_DZONES] = alloc_zone();
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if (ino->d2_zone[S_INDIRECT_IDX] == 0)
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ino->d2_zone[S_INDIRECT_IDX] = alloc_zone();
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get_block(ino->d2_zone[V2_NR_DZONES], (char *) indirblock);
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get_block(ino->d2_zone[S_INDIRECT_IDX], (char *) indirblock);
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for(k = 0; k < V2_INDIRECTS(block_size); k++) {
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z = indirblock[k];
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@ -840,7 +860,7 @@ void enter_dir(ino_t parent, char const *name, ino_t child)
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if(dir_try_enter(z, child, __UNCONST(name))) {
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put_block(b, (char *) inoblock);
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put_block(ino->d2_zone[V2_NR_DZONES], (char *) indirblock);
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put_block(ino->d2_zone[S_INDIRECT_IDX], (char *) indirblock);
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free(inoblock);
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free(indirblock);
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return;
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@ -858,9 +878,9 @@ void add_zone(ino_t n, zone_t z, size_t bytes, uint32_t cur_time)
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/* Add zone z to inode n. The file has grown by 'bytes' bytes. */
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int off, i;
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block_t b;
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zone_t indir;
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zone_t *blk;
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block_t b, inodeblock;
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zone_t dindir, indir;
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zone_t *dinblk, *blk;
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d2_inode *p;
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d2_inode *inode;
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@ -870,7 +890,7 @@ void add_zone(ino_t n, zone_t z, size_t bytes, uint32_t cur_time)
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if(!(inode = malloc(V2_INODES_PER_BLOCK(block_size)*sizeof(*inode))))
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pexit("Couldn't allocate block of inodes");
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b = ((n - 1) / V2_INODES_PER_BLOCK(block_size)) + inode_offset;
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inodeblock = b = ((n - 1) / V2_INODES_PER_BLOCK(block_size)) + inode_offset;
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off = (n - 1) % V2_INODES_PER_BLOCK(block_size);
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get_block(b, (char *) inode);
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p = &inode[off];
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@ -879,17 +899,18 @@ void add_zone(ino_t n, zone_t z, size_t bytes, uint32_t cur_time)
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for (i = 0; i < V2_NR_DZONES; i++)
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if (p->d2_zone[i] == 0) {
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p->d2_zone[i] = z;
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put_block(b, (char *) inode);
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put_block(inodeblock, (char *) inode);
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free(blk);
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free(inode);
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return;
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}
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put_block(b, (char *) inode);
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put_block(inodeblock, (char *) inode);
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/* File has grown beyond a small file. */
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if (p->d2_zone[V2_NR_DZONES] == 0) p->d2_zone[V2_NR_DZONES] = alloc_zone();
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indir = p->d2_zone[V2_NR_DZONES];
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put_block(b, (char *) inode);
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if (p->d2_zone[S_INDIRECT_IDX] == 0)
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p->d2_zone[S_INDIRECT_IDX] = alloc_zone();
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indir = p->d2_zone[S_INDIRECT_IDX];
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put_block(inodeblock, (char *) inode);
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b = indir;
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get_block(b, (char *) blk);
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for (i = 0; i < V2_INDIRECTS(block_size); i++)
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@ -900,7 +921,38 @@ void add_zone(ino_t n, zone_t z, size_t bytes, uint32_t cur_time)
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free(inode);
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return;
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}
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pexit("File has grown beyond single indirect");
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put_block(b, (char *) blk);
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if(!(dinblk = malloc(block_size)))
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pexit("Couldn't allocate double indirect block");
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/* We need a double indirect. */
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if (!p->d2_zone[D_INDIRECT_IDX]) p->d2_zone[D_INDIRECT_IDX] = alloc_zone();
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dindir = p->d2_zone[D_INDIRECT_IDX];
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get_block(dindir, (char *) dinblk);
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put_block(inodeblock, (char *) inode);
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/* Iterate over pointers to the next indirect block */
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for (i = 0; i < V2_INDIRECTS(block_size); i++) {
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int j;
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if (dinblk[i] == 0) dinblk[i] = alloc_zone();
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indir = dinblk[i];
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get_block(indir, (char *) blk);
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for (j = 0; j < V2_INDIRECTS(block_size); j++) {
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if (blk[j] == 0) {
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blk[j] = z;
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put_block(indir, (char *) blk);
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put_block(dindir, (char *) dinblk);
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free(blk);
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free(dinblk);
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free(inode);
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return;
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}
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}
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put_block(indir, (char *) blk);
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}
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pexit("File has grown beyond double indirect");
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}
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