/* * icount.c --- an efficient inode count abstraction * * Copyright (C) 1997 Theodore Ts'o. * * %Begin-Header% * This file may be redistributed under the terms of the GNU Library * General Public License, version 2. * %End-Header% */ #include "config.h" #if HAVE_UNISTD_H #include <unistd.h> #endif #include <string.h> #include <stdio.h> #include <sys/stat.h> #include <fcntl.h> #include <errno.h> #include "ext2_fs.h" #include "ext2fs.h" #include "tdb.h" /* * The data storage strategy used by icount relies on the observation * that most inode counts are either zero (for non-allocated inodes), * one (for most files), and only a few that are two or more * (directories and files that are linked to more than one directory). * * Also, e2fsck tends to load the icount data sequentially. * * So, we use an inode bitmap to indicate which inodes have a count of * one, and then use a sorted list to store the counts for inodes * which are greater than one. * * We also use an optional bitmap to indicate which inodes are already * in the sorted list, to speed up the use of this abstraction by * e2fsck's pass 2. Pass 2 increments inode counts as it finds them, * so this extra bitmap avoids searching the sorted list to see if a * particular inode is on the sorted list already. */ struct ext2_icount_el { ext2_ino_t ino; __u32 count; }; struct ext2_icount { errcode_t magic; ext2fs_inode_bitmap single; ext2fs_inode_bitmap multiple; ext2_ino_t count; ext2_ino_t size; ext2_ino_t num_inodes; ext2_ino_t cursor; struct ext2_icount_el *list; struct ext2_icount_el *last_lookup; #ifdef CONFIG_TDB char *tdb_fn; TDB_CONTEXT *tdb; #endif }; /* * We now use a 32-bit counter field because it doesn't cost us * anything extra for the in-memory data structure, due to alignment * padding. But there's no point changing the interface if most of * the time we only care if the number is bigger than 65,000 or not. * So use the following translation function to return a 16-bit count. */ #define icount_16_xlate(x) (((x) > 65500) ? 65500 : (x)) void ext2fs_free_icount(ext2_icount_t icount) { if (!icount) return; icount->magic = 0; if (icount->list) ext2fs_free_mem(&icount->list); if (icount->single) ext2fs_free_inode_bitmap(icount->single); if (icount->multiple) ext2fs_free_inode_bitmap(icount->multiple); #ifdef CONFIG_TDB if (icount->tdb) tdb_close(icount->tdb); if (icount->tdb_fn) { unlink(icount->tdb_fn); free(icount->tdb_fn); } #endif ext2fs_free_mem(&icount); } static errcode_t alloc_icount(ext2_filsys fs, int flags, ext2_icount_t *ret) { ext2_icount_t icount; errcode_t retval; *ret = 0; retval = ext2fs_get_mem(sizeof(struct ext2_icount), &icount); if (retval) return retval; memset(icount, 0, sizeof(struct ext2_icount)); retval = ext2fs_allocate_inode_bitmap(fs, "icount", &icount->single); if (retval) goto errout; if (flags & EXT2_ICOUNT_OPT_INCREMENT) { retval = ext2fs_allocate_inode_bitmap(fs, "icount_inc", &icount->multiple); if (retval) goto errout; } else icount->multiple = 0; icount->magic = EXT2_ET_MAGIC_ICOUNT; icount->num_inodes = fs->super->s_inodes_count; *ret = icount; return 0; errout: ext2fs_free_icount(icount); return(retval); } #ifdef CONFIG_TDB struct uuid { __u32 time_low; __u16 time_mid; __u16 time_hi_and_version; __u16 clock_seq; __u8 node[6]; }; static void unpack_uuid(void *in, struct uuid *uu) { __u8 *ptr = in; __u32 tmp; tmp = *ptr++; tmp = (tmp << 8) | *ptr++; tmp = (tmp << 8) | *ptr++; tmp = (tmp << 8) | *ptr++; uu->time_low = tmp; tmp = *ptr++; tmp = (tmp << 8) | *ptr++; uu->time_mid = tmp; tmp = *ptr++; tmp = (tmp << 8) | *ptr++; uu->time_hi_and_version = tmp; tmp = *ptr++; tmp = (tmp << 8) | *ptr++; uu->clock_seq = tmp; memcpy(uu->node, ptr, 6); } static void uuid_unparse(void *uu, char *out) { struct uuid uuid; unpack_uuid(uu, &uuid); sprintf(out, "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x", uuid.time_low, uuid.time_mid, uuid.time_hi_and_version, uuid.clock_seq >> 8, uuid.clock_seq & 0xFF, uuid.node[0], uuid.node[1], uuid.node[2], uuid.node[3], uuid.node[4], uuid.node[5]); } #endif errcode_t ext2fs_create_icount_tdb(ext2_filsys fs EXT2FS_NO_TDB_UNUSED, char *tdb_dir EXT2FS_NO_TDB_UNUSED, int flags EXT2FS_NO_TDB_UNUSED, ext2_icount_t *ret EXT2FS_NO_TDB_UNUSED) { #ifdef CONFIG_TDB ext2_icount_t icount; errcode_t retval; char *fn, uuid[40]; ext2_ino_t num_inodes; mode_t save_umask; int fd; retval = alloc_icount(fs, flags, &icount); if (retval) return retval; retval = ext2fs_get_mem(strlen(tdb_dir) + 64, &fn); if (retval) goto errout; uuid_unparse(fs->super->s_uuid, uuid); sprintf(fn, "%s/%s-icount-XXXXXX", tdb_dir, uuid); save_umask = umask(077); fd = mkstemp(fn); if (fd < 0) { retval = errno; ext2fs_free_mem(&fn); goto errout; } icount->tdb_fn = fn; umask(save_umask); /* * This is an overestimate of the size that we will need; the * ideal value is the number of used inodes with a count * greater than 1. OTOH the times when we really need this is * with the backup programs that use lots of hard links, in * which case the number of inodes in use approaches the ideal * value. */ num_inodes = fs->super->s_inodes_count - fs->super->s_free_inodes_count; icount->tdb = tdb_open(fn, num_inodes, TDB_NOLOCK | TDB_NOSYNC, O_RDWR | O_CREAT | O_TRUNC, 0600); close(fd); if (icount->tdb == NULL) { retval = errno; goto errout; } *ret = icount; return 0; errout: ext2fs_free_icount(icount); return(retval); #else return EXT2_ET_UNIMPLEMENTED; #endif } errcode_t ext2fs_create_icount2(ext2_filsys fs, int flags, unsigned int size, ext2_icount_t hint, ext2_icount_t *ret) { ext2_icount_t icount; errcode_t retval; size_t bytes; ext2_ino_t i; if (hint) { EXT2_CHECK_MAGIC(hint, EXT2_ET_MAGIC_ICOUNT); if (hint->size > size) size = (size_t) hint->size; } retval = alloc_icount(fs, flags, &icount); if (retval) return retval; if (size) { icount->size = size; } else { /* * Figure out how many special case inode counts we will * have. We know we will need one for each directory; * we also need to reserve some extra room for file links */ retval = ext2fs_get_num_dirs(fs, &icount->size); if (retval) goto errout; icount->size += fs->super->s_inodes_count / 50; } bytes = (size_t) (icount->size * sizeof(struct ext2_icount_el)); #if 0 printf("Icount allocated %u entries, %d bytes.\n", icount->size, bytes); #endif retval = ext2fs_get_array(icount->size, sizeof(struct ext2_icount_el), &icount->list); if (retval) goto errout; memset(icount->list, 0, bytes); icount->count = 0; icount->cursor = 0; /* * Populate the sorted list with those entries which were * found in the hint icount (since those are ones which will * likely need to be in the sorted list this time around). */ if (hint) { for (i=0; i < hint->count; i++) icount->list[i].ino = hint->list[i].ino; icount->count = hint->count; } *ret = icount; return 0; errout: ext2fs_free_icount(icount); return(retval); } errcode_t ext2fs_create_icount(ext2_filsys fs, int flags, unsigned int size, ext2_icount_t *ret) { return ext2fs_create_icount2(fs, flags, size, 0, ret); } /* * insert_icount_el() --- Insert a new entry into the sorted list at a * specified position. */ static struct ext2_icount_el *insert_icount_el(ext2_icount_t icount, ext2_ino_t ino, int pos) { struct ext2_icount_el *el; errcode_t retval; ext2_ino_t new_size = 0; int num; if (icount->last_lookup && icount->last_lookup->ino == ino) return icount->last_lookup; if (icount->count >= icount->size) { if (icount->count) { new_size = icount->list[(unsigned)icount->count-1].ino; new_size = (ext2_ino_t) (icount->count * ((float) icount->num_inodes / new_size)); } if (new_size < (icount->size + 100)) new_size = icount->size + 100; #if 0 printf("Reallocating icount %u entries...\n", new_size); #endif retval = ext2fs_resize_mem((size_t) icount->size * sizeof(struct ext2_icount_el), (size_t) new_size * sizeof(struct ext2_icount_el), &icount->list); if (retval) return 0; icount->size = new_size; } num = (int) icount->count - pos; if (num < 0) return 0; /* should never happen */ if (num) { memmove(&icount->list[pos+1], &icount->list[pos], sizeof(struct ext2_icount_el) * num); } icount->count++; el = &icount->list[pos]; el->count = 0; el->ino = ino; icount->last_lookup = el; return el; } /* * get_icount_el() --- given an inode number, try to find icount * information in the sorted list. If the create flag is set, * and we can't find an entry, create one in the sorted list. */ static struct ext2_icount_el *get_icount_el(ext2_icount_t icount, ext2_ino_t ino, int create) { int low, high, mid; if (!icount || !icount->list) return 0; if (create && ((icount->count == 0) || (ino > icount->list[(unsigned)icount->count-1].ino))) { return insert_icount_el(icount, ino, (unsigned) icount->count); } if (icount->count == 0) return 0; if (icount->cursor >= icount->count) icount->cursor = 0; if (ino == icount->list[icount->cursor].ino) return &icount->list[icount->cursor++]; #if 0 printf("Non-cursor get_icount_el: %u\n", ino); #endif low = 0; high = (int) icount->count-1; while (low <= high) { mid = ((unsigned)low + (unsigned)high) >> 1; if (ino == icount->list[mid].ino) { icount->cursor = mid+1; return &icount->list[mid]; } if (ino < icount->list[mid].ino) high = mid-1; else low = mid+1; } /* * If we need to create a new entry, it should be right at * low (where high will be left at low-1). */ if (create) return insert_icount_el(icount, ino, low); return 0; } static errcode_t set_inode_count(ext2_icount_t icount, ext2_ino_t ino, __u32 count) { struct ext2_icount_el *el; #ifdef CONFIG_TDB TDB_DATA key, data; if (icount->tdb) { key.dptr = (unsigned char *) &ino; key.dsize = sizeof(ext2_ino_t); data.dptr = (unsigned char *) &count; data.dsize = sizeof(__u32); if (count) { if (tdb_store(icount->tdb, key, data, TDB_REPLACE)) return tdb_error(icount->tdb) + EXT2_ET_TDB_SUCCESS; } else { if (tdb_delete(icount->tdb, key)) return tdb_error(icount->tdb) + EXT2_ET_TDB_SUCCESS; } return 0; } #endif el = get_icount_el(icount, ino, 1); if (!el) return EXT2_ET_NO_MEMORY; el->count = count; return 0; } static errcode_t get_inode_count(ext2_icount_t icount, ext2_ino_t ino, __u32 *count) { struct ext2_icount_el *el; #ifdef CONFIG_TDB TDB_DATA key, data; if (icount->tdb) { key.dptr = (unsigned char *) &ino; key.dsize = sizeof(ext2_ino_t); data = tdb_fetch(icount->tdb, key); if (data.dptr == NULL) { *count = 0; return tdb_error(icount->tdb) + EXT2_ET_TDB_SUCCESS; } *count = *((__u32 *) data.dptr); free(data.dptr); return 0; } #endif el = get_icount_el(icount, ino, 0); if (!el) { *count = 0; return ENOENT; } *count = el->count; return 0; } errcode_t ext2fs_icount_validate(ext2_icount_t icount, FILE *out) { errcode_t ret = 0; unsigned int i; const char *bad = "bad icount"; EXT2_CHECK_MAGIC(icount, EXT2_ET_MAGIC_ICOUNT); if (icount->count > icount->size) { fprintf(out, "%s: count > size\n", bad); return EXT2_ET_INVALID_ARGUMENT; } for (i=1; i < icount->count; i++) { if (icount->list[i-1].ino >= icount->list[i].ino) { fprintf(out, "%s: list[%d].ino=%u, list[%d].ino=%u\n", bad, i-1, icount->list[i-1].ino, i, icount->list[i].ino); ret = EXT2_ET_INVALID_ARGUMENT; } } return ret; } errcode_t ext2fs_icount_fetch(ext2_icount_t icount, ext2_ino_t ino, __u16 *ret) { __u32 val; EXT2_CHECK_MAGIC(icount, EXT2_ET_MAGIC_ICOUNT); if (!ino || (ino > icount->num_inodes)) return EXT2_ET_INVALID_ARGUMENT; if (ext2fs_test_inode_bitmap2(icount->single, ino)) { *ret = 1; return 0; } if (icount->multiple && !ext2fs_test_inode_bitmap2(icount->multiple, ino)) { *ret = 0; return 0; } get_inode_count(icount, ino, &val); *ret = icount_16_xlate(val); return 0; } errcode_t ext2fs_icount_increment(ext2_icount_t icount, ext2_ino_t ino, __u16 *ret) { __u32 curr_value; EXT2_CHECK_MAGIC(icount, EXT2_ET_MAGIC_ICOUNT); if (!ino || (ino > icount->num_inodes)) return EXT2_ET_INVALID_ARGUMENT; if (ext2fs_test_inode_bitmap2(icount->single, ino)) { /* * If the existing count is 1, then we know there is * no entry in the list. */ if (set_inode_count(icount, ino, 2)) return EXT2_ET_NO_MEMORY; curr_value = 2; ext2fs_unmark_inode_bitmap2(icount->single, ino); } else if (icount->multiple) { /* * The count is either zero or greater than 1; if the * inode is set in icount->multiple, then there should * be an entry in the list, so we need to fix it. */ if (ext2fs_test_inode_bitmap2(icount->multiple, ino)) { get_inode_count(icount, ino, &curr_value); curr_value++; if (set_inode_count(icount, ino, curr_value)) return EXT2_ET_NO_MEMORY; } else { /* * The count was zero; mark the single bitmap * and return. */ ext2fs_mark_inode_bitmap2(icount->single, ino); if (ret) *ret = 1; return 0; } } else { /* * The count is either zero or greater than 1; try to * find an entry in the list to determine which. */ get_inode_count(icount, ino, &curr_value); curr_value++; if (set_inode_count(icount, ino, curr_value)) return EXT2_ET_NO_MEMORY; } if (icount->multiple) ext2fs_mark_inode_bitmap2(icount->multiple, ino); if (ret) *ret = icount_16_xlate(curr_value); return 0; } errcode_t ext2fs_icount_decrement(ext2_icount_t icount, ext2_ino_t ino, __u16 *ret) { __u32 curr_value; if (!ino || (ino > icount->num_inodes)) return EXT2_ET_INVALID_ARGUMENT; EXT2_CHECK_MAGIC(icount, EXT2_ET_MAGIC_ICOUNT); if (ext2fs_test_inode_bitmap2(icount->single, ino)) { ext2fs_unmark_inode_bitmap2(icount->single, ino); if (icount->multiple) ext2fs_unmark_inode_bitmap2(icount->multiple, ino); else { set_inode_count(icount, ino, 0); } if (ret) *ret = 0; return 0; } if (icount->multiple && !ext2fs_test_inode_bitmap2(icount->multiple, ino)) return EXT2_ET_INVALID_ARGUMENT; get_inode_count(icount, ino, &curr_value); if (!curr_value) return EXT2_ET_INVALID_ARGUMENT; curr_value--; if (set_inode_count(icount, ino, curr_value)) return EXT2_ET_NO_MEMORY; if (curr_value == 1) ext2fs_mark_inode_bitmap2(icount->single, ino); if ((curr_value == 0) && icount->multiple) ext2fs_unmark_inode_bitmap2(icount->multiple, ino); if (ret) *ret = icount_16_xlate(curr_value); return 0; } errcode_t ext2fs_icount_store(ext2_icount_t icount, ext2_ino_t ino, __u16 count) { if (!ino || (ino > icount->num_inodes)) return EXT2_ET_INVALID_ARGUMENT; EXT2_CHECK_MAGIC(icount, EXT2_ET_MAGIC_ICOUNT); if (count == 1) { ext2fs_mark_inode_bitmap2(icount->single, ino); if (icount->multiple) ext2fs_unmark_inode_bitmap2(icount->multiple, ino); return 0; } if (count == 0) { ext2fs_unmark_inode_bitmap2(icount->single, ino); if (icount->multiple) { /* * If the icount->multiple bitmap is enabled, * we can just clear both bitmaps and we're done */ ext2fs_unmark_inode_bitmap2(icount->multiple, ino); } else set_inode_count(icount, ino, 0); return 0; } if (set_inode_count(icount, ino, count)) return EXT2_ET_NO_MEMORY; ext2fs_unmark_inode_bitmap2(icount->single, ino); if (icount->multiple) ext2fs_mark_inode_bitmap2(icount->multiple, ino); return 0; } ext2_ino_t ext2fs_get_icount_size(ext2_icount_t icount) { if (!icount || icount->magic != EXT2_ET_MAGIC_ICOUNT) return 0; return icount->size; } #ifdef DEBUG ext2_filsys test_fs; ext2_icount_t icount; #define EXIT 0x00 #define FETCH 0x01 #define STORE 0x02 #define INCREMENT 0x03 #define DECREMENT 0x04 struct test_program { int cmd; ext2_ino_t ino; __u16 arg; __u16 expected; }; struct test_program prog[] = { { STORE, 42, 42, 42 }, { STORE, 1, 1, 1 }, { STORE, 2, 2, 2 }, { STORE, 3, 3, 3 }, { STORE, 10, 1, 1 }, { STORE, 42, 0, 0 }, { INCREMENT, 5, 0, 1 }, { INCREMENT, 5, 0, 2 }, { INCREMENT, 5, 0, 3 }, { INCREMENT, 5, 0, 4 }, { DECREMENT, 5, 0, 3 }, { DECREMENT, 5, 0, 2 }, { DECREMENT, 5, 0, 1 }, { DECREMENT, 5, 0, 0 }, { FETCH, 10, 0, 1 }, { FETCH, 1, 0, 1 }, { FETCH, 2, 0, 2 }, { FETCH, 3, 0, 3 }, { INCREMENT, 1, 0, 2 }, { DECREMENT, 2, 0, 1 }, { DECREMENT, 2, 0, 0 }, { FETCH, 12, 0, 0 }, { EXIT, 0, 0, 0 } }; struct test_program extended[] = { { STORE, 1, 1, 1 }, { STORE, 2, 2, 2 }, { STORE, 3, 3, 3 }, { STORE, 4, 4, 4 }, { STORE, 5, 5, 5 }, { STORE, 6, 1, 1 }, { STORE, 7, 2, 2 }, { STORE, 8, 3, 3 }, { STORE, 9, 4, 4 }, { STORE, 10, 5, 5 }, { STORE, 11, 1, 1 }, { STORE, 12, 2, 2 }, { STORE, 13, 3, 3 }, { STORE, 14, 4, 4 }, { STORE, 15, 5, 5 }, { STORE, 16, 1, 1 }, { STORE, 17, 2, 2 }, { STORE, 18, 3, 3 }, { STORE, 19, 4, 4 }, { STORE, 20, 5, 5 }, { STORE, 21, 1, 1 }, { STORE, 22, 2, 2 }, { STORE, 23, 3, 3 }, { STORE, 24, 4, 4 }, { STORE, 25, 5, 5 }, { STORE, 26, 1, 1 }, { STORE, 27, 2, 2 }, { STORE, 28, 3, 3 }, { STORE, 29, 4, 4 }, { STORE, 30, 5, 5 }, { EXIT, 0, 0, 0 } }; /* * Setup the variables for doing the inode scan test. */ static void setup(void) { errcode_t retval; struct ext2_super_block param; initialize_ext2_error_table(); memset(¶m, 0, sizeof(param)); ext2fs_blocks_count_set(¶m, 12000); retval = ext2fs_initialize("test fs", EXT2_FLAG_64BITS, ¶m, test_io_manager, &test_fs); if (retval) { com_err("setup", retval, "while initializing filesystem"); exit(1); } retval = ext2fs_allocate_tables(test_fs); if (retval) { com_err("setup", retval, "while allocating tables for test filesystem"); exit(1); } } int run_test(int flags, int size, char *dir, struct test_program *prog) { errcode_t retval; ext2_icount_t icount; struct test_program *pc; __u16 result; int problem = 0; if (dir) { #ifdef CONFIG_TDB retval = ext2fs_create_icount_tdb(test_fs, dir, flags, &icount); if (retval) { com_err("run_test", retval, "while creating icount using tdb"); exit(1); } #else printf("Skipped\n"); return 0; #endif } else { retval = ext2fs_create_icount2(test_fs, flags, size, 0, &icount); if (retval) { com_err("run_test", retval, "while creating icount"); exit(1); } } for (pc = prog; pc->cmd != EXIT; pc++) { switch (pc->cmd) { case FETCH: printf("icount_fetch(%u) = ", pc->ino); break; case STORE: retval = ext2fs_icount_store(icount, pc->ino, pc->arg); if (retval) { com_err("run_test", retval, "while calling icount_store"); exit(1); } printf("icount_store(%u, %u) = ", pc->ino, pc->arg); break; case INCREMENT: retval = ext2fs_icount_increment(icount, pc->ino, 0); if (retval) { com_err("run_test", retval, "while calling icount_increment"); exit(1); } printf("icount_increment(%u) = ", pc->ino); break; case DECREMENT: retval = ext2fs_icount_decrement(icount, pc->ino, 0); if (retval) { com_err("run_test", retval, "while calling icount_decrement"); exit(1); } printf("icount_decrement(%u) = ", pc->ino); break; } retval = ext2fs_icount_fetch(icount, pc->ino, &result); if (retval) { com_err("run_test", retval, "while calling icount_fetch"); exit(1); } printf("%u (%s)\n", result, (result == pc->expected) ? "OK" : "NOT OK"); if (result != pc->expected) problem++; } printf("icount size is %u\n", ext2fs_get_icount_size(icount)); retval = ext2fs_icount_validate(icount, stdout); if (retval) { com_err("run_test", retval, "while calling icount_validate"); exit(1); } ext2fs_free_icount(icount); return problem; } int main(int argc, char **argv) { int failed = 0; setup(); printf("Standard icount run:\n"); failed += run_test(0, 0, 0, prog); printf("\nMultiple bitmap test:\n"); failed += run_test(EXT2_ICOUNT_OPT_INCREMENT, 0, 0, prog); printf("\nResizing icount:\n"); failed += run_test(0, 3, 0, extended); printf("\nStandard icount run with tdb:\n"); failed += run_test(0, 0, ".", prog); printf("\nMultiple bitmap test with tdb:\n"); failed += run_test(EXT2_ICOUNT_OPT_INCREMENT, 0, ".", prog); if (failed) printf("FAILED!\n"); return failed; } #endif