From: Ben Gras Date: Fri, 26 Apr 2013 15:35:31 +0000 (+0000) Subject: mkfs.mfs: double indirect block support X-Git-Tag: v3.3.0~999 X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/zlib_tech.html?a=commitdiff_plain;h=refs%2Fchanges%2F31%2F531%2F2;p=minix.git mkfs.mfs: double indirect block support . allows >4MB files for default 4k block size Change-Id: I09277fc3704fac1a44af82202c11435dc7ae8d55 --- diff --git a/usr.sbin/mkfs.mfs/mkfs.c b/usr.sbin/mkfs.mfs/mkfs.c index 88c35eb6a..f0e8e9924 100644 --- a/usr.sbin/mkfs.mfs/mkfs.c +++ b/usr.sbin/mkfs.mfs/mkfs.c @@ -39,6 +39,8 @@ #endif #include + + #undef EXTERN #define EXTERN /* get rid of EXTERN by making it null */ #include "super.h" @@ -56,6 +58,9 @@ #define INODE_MAX ((unsigned) 65535) #define SECTOR_SIZE 512 +/* inode block indexes pointing to single and double indirect block */ +#define S_INDIRECT_IDX (V2_NR_DZONES) +#define D_INDIRECT_IDX (V2_NR_DZONES+1) #if !defined(__minix) #define mul64u(a,b) ((a) * (b)) @@ -289,11 +294,7 @@ char *argv[]; if (blocks == 0) pexit("Can't open prototype file"); } if (i == 0) { -#if defined(__minix) - uint32_t kb = div64u(mul64u(blocks, block_size), 1024); -#else uint32_t kb = ((unsigned long long) blocks * block_size) / 1024; -#endif i = kb / 2; if (kb >= 100000) i = kb / 4; @@ -393,6 +394,7 @@ printf("testb = 0x%x 0x%x 0x%x\n", testb[0], testb[1], testb[block_size-1]); *===============================================================*/ void detect_fs_size(struct fs_size * fssize) { + int prev_lct = lct; uint32_t point = ftell(proto); fssize->inocount = 1; /* root directory node */ @@ -409,6 +411,7 @@ void detect_fs_size(struct fs_size * fssize) initb += (fssize->inocount + inodes_per_block - 1) / inodes_per_block; fssize->blockcount = initb+ fssize->zonecount; + lct = prev_lct; fseek(proto, point, SEEK_SET); } @@ -420,10 +423,17 @@ void sizeup_dir(struct fs_size * fssize) size_t size; int dir_entries = 2; zone_t dir_zones = 0; - zone_t nr_dzones; + zone_t nr_dzones, nr_indirzones; + + /* how many data blocks are addressed using a single indirect block? */ + int indir_addressed = V2_INDIRECTS(block_size); + /* number of file zones we can address directly from the inode */ nr_dzones = V2_NR_DZONES; + /* number of file zones we can address directly and with a single indirect */ + nr_indirzones = V2_NR_DZONES + indir_addressed; + while (1) { getline(line, token); p = token[0]; @@ -453,6 +463,7 @@ void sizeup_dir(struct fs_size * fssize) progname, token[4], strerror(errno)); pexit("dynamic size detection failed"); } else { + int indirects = 0; if (fseek(f, 0, SEEK_END) < 0) { fprintf(stderr, "%s: Can't seek to end of %s\n", progname, token[4]); @@ -460,12 +471,21 @@ void sizeup_dir(struct fs_size * fssize) } size = ftell(f); fclose(f); - zone_t fzones= (size / block_size); - if (size % block_size) - fzones++; + zone_t fzones= roundup(size, block_size) / block_size; if (fzones > nr_dzones) - fzones++; /* Assumes files fit within single indirect */ - fssize->zonecount += fzones; + indirects++; /* single indirect needed */ + if (fzones > nr_indirzones) { + int dindirect = 0; + int dindirzones = fzones - nr_indirzones; + + /* how many zones needed to point to data + * blocks? + */ + dindirect = 1 + roundup(dindirzones, + indir_addressed) / indir_addressed; + indirects += dindirect; + } + fssize->zonecount += fzones + indirects; } } } @@ -829,10 +849,10 @@ void enter_dir(ino_t parent, char const *name, ino_t child) } /* no space in directory using just direct blocks; try indirect */ - if (ino->d2_zone[V2_NR_DZONES] == 0) - ino->d2_zone[V2_NR_DZONES] = alloc_zone(); + if (ino->d2_zone[S_INDIRECT_IDX] == 0) + ino->d2_zone[S_INDIRECT_IDX] = alloc_zone(); - get_block(ino->d2_zone[V2_NR_DZONES], (char *) indirblock); + get_block(ino->d2_zone[S_INDIRECT_IDX], (char *) indirblock); for(k = 0; k < V2_INDIRECTS(block_size); k++) { z = indirblock[k]; @@ -840,7 +860,7 @@ void enter_dir(ino_t parent, char const *name, ino_t child) if(dir_try_enter(z, child, __UNCONST(name))) { put_block(b, (char *) inoblock); - put_block(ino->d2_zone[V2_NR_DZONES], (char *) indirblock); + put_block(ino->d2_zone[S_INDIRECT_IDX], (char *) indirblock); free(inoblock); free(indirblock); return; @@ -858,9 +878,9 @@ void add_zone(ino_t n, zone_t z, size_t bytes, uint32_t cur_time) /* Add zone z to inode n. The file has grown by 'bytes' bytes. */ int off, i; - block_t b; - zone_t indir; - zone_t *blk; + block_t b, inodeblock; + zone_t dindir, indir; + zone_t *dinblk, *blk; d2_inode *p; d2_inode *inode; @@ -870,7 +890,7 @@ void add_zone(ino_t n, zone_t z, size_t bytes, uint32_t cur_time) if(!(inode = malloc(V2_INODES_PER_BLOCK(block_size)*sizeof(*inode)))) pexit("Couldn't allocate block of inodes"); - b = ((n - 1) / V2_INODES_PER_BLOCK(block_size)) + inode_offset; + inodeblock = b = ((n - 1) / V2_INODES_PER_BLOCK(block_size)) + inode_offset; off = (n - 1) % V2_INODES_PER_BLOCK(block_size); get_block(b, (char *) inode); p = &inode[off]; @@ -879,17 +899,18 @@ void add_zone(ino_t n, zone_t z, size_t bytes, uint32_t cur_time) for (i = 0; i < V2_NR_DZONES; i++) if (p->d2_zone[i] == 0) { p->d2_zone[i] = z; - put_block(b, (char *) inode); + put_block(inodeblock, (char *) inode); free(blk); free(inode); return; } - put_block(b, (char *) inode); + put_block(inodeblock, (char *) inode); /* File has grown beyond a small file. */ - if (p->d2_zone[V2_NR_DZONES] == 0) p->d2_zone[V2_NR_DZONES] = alloc_zone(); - indir = p->d2_zone[V2_NR_DZONES]; - put_block(b, (char *) inode); + if (p->d2_zone[S_INDIRECT_IDX] == 0) + p->d2_zone[S_INDIRECT_IDX] = alloc_zone(); + indir = p->d2_zone[S_INDIRECT_IDX]; + put_block(inodeblock, (char *) inode); b = indir; get_block(b, (char *) blk); for (i = 0; i < V2_INDIRECTS(block_size); i++) @@ -900,7 +921,38 @@ void add_zone(ino_t n, zone_t z, size_t bytes, uint32_t cur_time) free(inode); return; } - pexit("File has grown beyond single indirect"); + put_block(b, (char *) blk); + + if(!(dinblk = malloc(block_size))) + pexit("Couldn't allocate double indirect block"); + + /* We need a double indirect. */ + if (!p->d2_zone[D_INDIRECT_IDX]) p->d2_zone[D_INDIRECT_IDX] = alloc_zone(); + dindir = p->d2_zone[D_INDIRECT_IDX]; + get_block(dindir, (char *) dinblk); + put_block(inodeblock, (char *) inode); + + /* Iterate over pointers to the next indirect block */ + for (i = 0; i < V2_INDIRECTS(block_size); i++) { + int j; + if (dinblk[i] == 0) dinblk[i] = alloc_zone(); + indir = dinblk[i]; + get_block(indir, (char *) blk); + for (j = 0; j < V2_INDIRECTS(block_size); j++) { + if (blk[j] == 0) { + blk[j] = z; + put_block(indir, (char *) blk); + put_block(dindir, (char *) dinblk); + free(blk); + free(dinblk); + free(inode); + return; + } + } + put_block(indir, (char *) blk); + } + + pexit("File has grown beyond double indirect"); }