X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=lib%2Fext2fs%2Finitialize.c;h=2875f97ea9213598dba63890278bd9019b5e2bc2;hb=bfbeec0c89d44d456003770d25c70735e45c5622;hp=5c7fb324885a8ba479146447863797d654f2e090;hpb=7b4e4534f9361b21d3fafdd88a58f133decee38c;p=tools%2Fe2fsprogs.git diff --git a/lib/ext2fs/initialize.c b/lib/ext2fs/initialize.c index 5c7fb32..2875f97 100644 --- a/lib/ext2fs/initialize.c +++ b/lib/ext2fs/initialize.c @@ -1,21 +1,21 @@ /* * initialize.c --- initialize a filesystem handle given superblock * parameters. Used by mke2fs when initializing a filesystem. - * + * * Copyright (C) 1994, 1995, 1996 Theodore Ts'o. - * + * * %Begin-Header% - * This file may be redistributed under the terms of the GNU Public - * License. + * This file may be redistributed under the terms of the GNU Library + * General Public License, version 2. * %End-Header% */ +#include "config.h" #include #include #if HAVE_UNISTD_H #include #endif -#include #include #include #if HAVE_SYS_STAT_H @@ -25,34 +25,61 @@ #include #endif -#include - +#include "ext2_fs.h" #include "ext2fs.h" -#if defined(__linux__) && defined(EXT2_OS_LINUX) +#if defined(__linux__) && defined(EXT2_OS_LINUX) #define CREATOR_OS EXT2_OS_LINUX -#elif defined(__gnu__) && defined(EXT2_OS_HURD) +#else +#if defined(__GNU__) && defined(EXT2_OS_HURD) #define CREATOR_OS EXT2_OS_HURD -#elif defined(__FreeBSD__) && defined(EXT2_OS_FREEBSD) +#else +#if defined(__FreeBSD__) && defined(EXT2_OS_FREEBSD) #define CREATOR_OS EXT2_OS_FREEBSD -#elif defined(LITES) && defined(EXT2_OS_LITES) +#else +#if defined(LITES) && defined(EXT2_OS_LITES) #define CREATOR_OS EXT2_OS_LITES #else #define CREATOR_OS EXT2_OS_LINUX /* by default */ -#endif +#endif /* defined(LITES) && defined(EXT2_OS_LITES) */ +#endif /* defined(__FreeBSD__) && defined(EXT2_OS_FREEBSD) */ +#endif /* defined(__GNU__) && defined(EXT2_OS_HURD) */ +#endif /* defined(__linux__) && defined(EXT2_OS_LINUX) */ /* - * Note we override the kernel include file's idea of what the default - * check interval (never) should be. It's a good idea to check at - * least *occasionally*, specially since servers will never rarely get - * to reboot, since Linux is so robust these days. :-) - * - * 180 days (six months) seems like a good value. + * Calculate the number of GDT blocks to reserve for online filesystem growth. + * The absolute maximum number of GDT blocks we can reserve is determined by + * the number of block pointers that can fit into a single block. */ -#ifdef EXT2_DFL_CHECKINTERVAL -#undef EXT2_DFL_CHECKINTERVAL +static unsigned int calc_reserved_gdt_blocks(ext2_filsys fs) +{ + struct ext2_super_block *sb = fs->super; + unsigned long bpg = sb->s_blocks_per_group; + unsigned int gdpb = EXT2_DESC_PER_BLOCK(sb); + unsigned long max_blocks = 0xffffffff; + unsigned long rsv_groups; + unsigned int rsv_gdb; + + /* We set it at 1024x the current filesystem size, or + * the upper block count limit (2^32), whichever is lower. + */ + if (ext2fs_blocks_count(sb) < max_blocks / 1024) + max_blocks = ext2fs_blocks_count(sb) * 1024; + /* + * ext2fs_div64_ceil() is unnecessary because max_blocks is + * max _GDT_ blocks, which is limited to 32 bits. + */ + rsv_groups = ext2fs_div_ceil(max_blocks - sb->s_first_data_block, bpg); + rsv_gdb = ext2fs_div_ceil(rsv_groups, gdpb) - fs->desc_blocks; + if (rsv_gdb > EXT2_ADDR_PER_BLOCK(sb)) + rsv_gdb = EXT2_ADDR_PER_BLOCK(sb); +#ifdef RES_GDT_DEBUG + printf("max_blocks %lu, rsv_groups = %lu, rsv_gdb = %u\n", + max_blocks, rsv_groups, rsv_gdb); #endif -#define EXT2_DFL_CHECKINTERVAL (86400L * 180L) + + return rsv_gdb; +} errcode_t ext2fs_initialize(const char *name, int flags, struct ext2_super_block *param, @@ -61,35 +88,47 @@ errcode_t ext2fs_initialize(const char *name, int flags, ext2_filsys fs; errcode_t retval; struct ext2_super_block *super; - int frags_per_block; - int rem; - int overhead = 0; - blk_t group_block; - int i, j; + unsigned int rem; + unsigned int overhead = 0; + unsigned int ipg; + dgrp_t i; + blk64_t free_blocks; blk_t numblocks; - char *buf; + int rsv_gdt; + int csum_flag; + int bigalloc_flag; + int io_flags; + char *buf = 0; + char c; - if (!param || !param->s_blocks_count) - return EXT2_INVALID_ARGUMENT; - - retval = ext2fs_get_mem(sizeof(struct struct_ext2_filsys), - (void **) &fs); + if (!param || !ext2fs_blocks_count(param)) + return EXT2_ET_INVALID_ARGUMENT; + + retval = ext2fs_get_mem(sizeof(struct struct_ext2_filsys), &fs); if (retval) return retval; - + memset(fs, 0, sizeof(struct struct_ext2_filsys)); fs->magic = EXT2_ET_MAGIC_EXT2FS_FILSYS; - fs->flags = flags | EXT2_FLAG_RW | ext2fs_native_flag(); - retval = manager->open(name, IO_FLAG_RW, &fs->io); + fs->flags = flags | EXT2_FLAG_RW; + fs->umask = 022; +#ifdef WORDS_BIGENDIAN + fs->flags |= EXT2_FLAG_SWAP_BYTES; +#endif + io_flags = IO_FLAG_RW; + if (flags & EXT2_FLAG_EXCLUSIVE) + io_flags |= IO_FLAG_EXCLUSIVE; + retval = manager->open(name, io_flags, &fs->io); if (retval) goto cleanup; + fs->image_io = fs->io; fs->io->app_data = fs; - retval = ext2fs_get_mem(strlen(name)+1, (void **) &fs->device_name); + retval = ext2fs_get_mem(strlen(name)+1, &fs->device_name); if (retval) goto cleanup; strcpy(fs->device_name, name); - retval = ext2fs_get_mem(SUPERBLOCK_SIZE, (void **) &super); + retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &super); if (retval) goto cleanup; fs->super = super; @@ -98,76 +137,173 @@ errcode_t ext2fs_initialize(const char *name, int flags, #define set_field(field, default) (super->field = param->field ? \ param->field : (default)) +#define assign_field(field) (super->field = param->field) super->s_magic = EXT2_SUPER_MAGIC; super->s_state = EXT2_VALID_FS; - set_field(s_log_block_size, 0); /* default blocksize: 1024 bytes */ - set_field(s_log_frag_size, 0); /* default fragsize: 1024 bytes */ - set_field(s_first_data_block, super->s_log_block_size ? 0 : 1); - set_field(s_max_mnt_count, EXT2_DFL_MAX_MNT_COUNT); + bigalloc_flag = EXT2_HAS_RO_COMPAT_FEATURE(param, + EXT4_FEATURE_RO_COMPAT_BIGALLOC); + + assign_field(s_log_block_size); + + if (bigalloc_flag) { + set_field(s_log_cluster_size, super->s_log_block_size+4); + if (super->s_log_block_size > super->s_log_cluster_size) { + retval = EXT2_ET_INVALID_ARGUMENT; + goto cleanup; + } + } else + super->s_log_cluster_size = super->s_log_block_size; + + set_field(s_first_data_block, super->s_log_cluster_size ? 0 : 1); + set_field(s_max_mnt_count, 0); set_field(s_errors, EXT2_ERRORS_DEFAULT); -#ifdef EXT2_DYNAMIC_REV set_field(s_feature_compat, 0); set_field(s_feature_incompat, 0); set_field(s_feature_ro_compat, 0); - if (super->s_feature_incompat & ~EXT2_LIB_FEATURE_INCOMPAT_SUPP) - return EXT2_ET_UNSUPP_FEATURE; - if (super->s_feature_ro_compat & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP) - return EXT2_ET_RO_UNSUPP_FEATURE; + set_field(s_default_mount_opts, 0); + set_field(s_first_meta_bg, 0); + set_field(s_raid_stride, 0); /* default stride size: 0 */ + set_field(s_raid_stripe_width, 0); /* default stripe width: 0 */ + set_field(s_log_groups_per_flex, 0); + set_field(s_flags, 0); + if (super->s_feature_incompat & ~EXT2_LIB_FEATURE_INCOMPAT_SUPP) { + retval = EXT2_ET_UNSUPP_FEATURE; + goto cleanup; + } + if (super->s_feature_ro_compat & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP) { + retval = EXT2_ET_RO_UNSUPP_FEATURE; + goto cleanup; + } set_field(s_rev_level, EXT2_GOOD_OLD_REV); if (super->s_rev_level >= EXT2_DYNAMIC_REV) { set_field(s_first_ino, EXT2_GOOD_OLD_FIRST_INO); set_field(s_inode_size, EXT2_GOOD_OLD_INODE_SIZE); + if (super->s_inode_size >= sizeof(struct ext2_inode_large)) { + int extra_isize = sizeof(struct ext2_inode_large) - + EXT2_GOOD_OLD_INODE_SIZE; + set_field(s_min_extra_isize, extra_isize); + set_field(s_want_extra_isize, extra_isize); + } + } else { + super->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; + super->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; } -#endif - set_field(s_checkinterval, EXT2_DFL_CHECKINTERVAL); - super->s_lastcheck = time(NULL); + set_field(s_checkinterval, 0); + super->s_mkfs_time = super->s_lastcheck = fs->now ? fs->now : time(NULL); super->s_creator_os = CREATOR_OS; - fs->blocksize = EXT2_BLOCK_SIZE(super); - fs->fragsize = EXT2_FRAG_SIZE(super); - frags_per_block = fs->blocksize / fs->fragsize; - - /* default: (fs->blocksize*8) blocks/group */ - set_field(s_blocks_per_group, fs->blocksize*8); - super->s_frags_per_group = super->s_blocks_per_group * frags_per_block; - - super->s_blocks_count = param->s_blocks_count; - super->s_r_blocks_count = param->s_r_blocks_count; - if (super->s_r_blocks_count >= param->s_blocks_count) { - retval = EXT2_INVALID_ARGUMENT; + fs->fragsize = fs->blocksize = EXT2_BLOCK_SIZE(super); + fs->cluster_ratio_bits = super->s_log_cluster_size - + super->s_log_block_size; + + if (bigalloc_flag) { + if (param->s_blocks_per_group && + param->s_clusters_per_group && + ((param->s_clusters_per_group * EXT2FS_CLUSTER_RATIO(fs)) != + param->s_blocks_per_group)) { + retval = EXT2_ET_INVALID_ARGUMENT; + goto cleanup; + } + if (param->s_clusters_per_group) + assign_field(s_clusters_per_group); + else if (param->s_blocks_per_group) + super->s_clusters_per_group = + param->s_blocks_per_group / + EXT2FS_CLUSTER_RATIO(fs); + else + super->s_clusters_per_group = fs->blocksize * 8; + if (super->s_clusters_per_group > EXT2_MAX_CLUSTERS_PER_GROUP(super)) + super->s_clusters_per_group = EXT2_MAX_CLUSTERS_PER_GROUP(super); + super->s_blocks_per_group = EXT2FS_C2B(fs, + super->s_clusters_per_group); + } else { + set_field(s_blocks_per_group, fs->blocksize * 8); + if (super->s_blocks_per_group > EXT2_MAX_BLOCKS_PER_GROUP(super)) + super->s_blocks_per_group = EXT2_MAX_BLOCKS_PER_GROUP(super); + super->s_clusters_per_group = super->s_blocks_per_group; + } + + ext2fs_blocks_count_set(super, ext2fs_blocks_count(param) & + ~((blk64_t) EXT2FS_CLUSTER_MASK(fs))); + ext2fs_r_blocks_count_set(super, ext2fs_r_blocks_count(param)); + if (ext2fs_r_blocks_count(super) >= ext2fs_blocks_count(param)) { + retval = EXT2_ET_INVALID_ARGUMENT; goto cleanup; } + /* + * If we're creating an external journal device, we don't need + * to bother with the rest. + */ + if (super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) { + fs->group_desc_count = 0; + ext2fs_mark_super_dirty(fs); + *ret_fs = fs; + return 0; + } + retry: - fs->group_desc_count = (super->s_blocks_count - - super->s_first_data_block + - EXT2_BLOCKS_PER_GROUP(super) - 1) - / EXT2_BLOCKS_PER_GROUP(super); - if (fs->group_desc_count == 0) - return EXT2_ET_TOOSMALL; - fs->desc_blocks = (fs->group_desc_count + - EXT2_DESC_PER_BLOCK(super) - 1) - / EXT2_DESC_PER_BLOCK(super); - - set_field(s_inodes_count, (super->s_blocks_count*fs->blocksize)/4096); + fs->group_desc_count = (blk_t) ext2fs_div64_ceil( + ext2fs_blocks_count(super) - super->s_first_data_block, + EXT2_BLOCKS_PER_GROUP(super)); + if (fs->group_desc_count == 0) { + retval = EXT2_ET_TOOSMALL; + goto cleanup; + } + + if (super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) + super->s_desc_size = EXT2_MIN_DESC_SIZE_64BIT; + + fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count, + EXT2_DESC_PER_BLOCK(super)); + + i = fs->blocksize >= 4096 ? 1 : 4096 / fs->blocksize; + + if (super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT && + (ext2fs_blocks_count(super) / i) > (1ULL << 32)) + set_field(s_inodes_count, ~0U); + else + set_field(s_inodes_count, ext2fs_blocks_count(super) / i); + + /* + * Make sure we have at least EXT2_FIRST_INO + 1 inodes, so + * that we have enough inodes for the filesystem(!) + */ + if (super->s_inodes_count < EXT2_FIRST_INODE(super)+1) + super->s_inodes_count = EXT2_FIRST_INODE(super)+1; /* * There should be at least as many inodes as the user * requested. Figure out how many inodes per group that * should be. But make sure that we don't allocate more than - * one bitmap's worth of inodes + * one bitmap's worth of inodes each group. */ - super->s_inodes_per_group = (super->s_inodes_count + - fs->group_desc_count - 1) / - fs->group_desc_count; - if (super->s_inodes_per_group > fs->blocksize*8) - super->s_inodes_per_group = fs->blocksize*8; - + ipg = ext2fs_div_ceil(super->s_inodes_count, fs->group_desc_count); + if (ipg > fs->blocksize * 8) { + if (!bigalloc_flag && super->s_blocks_per_group >= 256) { + /* Try again with slightly different parameters */ + super->s_blocks_per_group -= 8; + ext2fs_blocks_count_set(super, + ext2fs_blocks_count(param)); + super->s_clusters_per_group = super->s_blocks_per_group; + goto retry; + } else { + retval = EXT2_ET_TOO_MANY_INODES; + goto cleanup; + } + } + + if (ipg > (unsigned) EXT2_MAX_INODES_PER_GROUP(super)) + ipg = EXT2_MAX_INODES_PER_GROUP(super); + +ipg_retry: + super->s_inodes_per_group = ipg; + /* * Make sure the number of inodes per group completely fills * the inode table blocks in the descriptor. If not, add some @@ -185,6 +321,8 @@ retry: * multiple of 8. This is needed to simplify the bitmap * splicing code. */ + if (super->s_inodes_per_group < 8) + super->s_inodes_per_group = 8; super->s_inodes_per_group &= ~7; fs->inode_blocks_per_group = (((super->s_inodes_per_group * EXT2_INODE_SIZE(super)) + @@ -194,32 +332,62 @@ retry: /* * adjust inode count to reflect the adjusted inodes_per_group */ + if ((__u64)super->s_inodes_per_group * fs->group_desc_count > ~0U) { + ipg--; + goto ipg_retry; + } super->s_inodes_count = super->s_inodes_per_group * fs->group_desc_count; super->s_free_inodes_count = super->s_inodes_count; /* - * Overhead is the number of bookkeeping blocks per group. It - * includes the superblock backup, the group descriptor - * backups, the inode bitmap, the block bitmap, and the inode - * table. - * - * XXX Not all block groups need the descriptor blocks, but - * being clever is tricky... + * check the number of reserved group descriptor table blocks */ - overhead = (int) (3 + fs->desc_blocks + fs->inode_blocks_per_group); - + if (super->s_feature_compat & EXT2_FEATURE_COMPAT_RESIZE_INODE) + rsv_gdt = calc_reserved_gdt_blocks(fs); + else + rsv_gdt = 0; + set_field(s_reserved_gdt_blocks, rsv_gdt); + if (super->s_reserved_gdt_blocks > EXT2_ADDR_PER_BLOCK(super)) { + retval = EXT2_ET_RES_GDT_BLOCKS; + goto cleanup; + } + + /* + * Calculate the maximum number of bookkeeping blocks per + * group. It includes the superblock, the block group + * descriptors, the block bitmap, the inode bitmap, the inode + * table, and the reserved gdt blocks. + */ + overhead = (int) (3 + fs->inode_blocks_per_group + + fs->desc_blocks + super->s_reserved_gdt_blocks); + + /* This can only happen if the user requested too many inodes */ + if (overhead > super->s_blocks_per_group) { + retval = EXT2_ET_TOO_MANY_INODES; + goto cleanup; + } + /* * See if the last group is big enough to support the * necessary data structures. If not, we need to get rid of - * it. + * it. We need to recalculate the overhead for the last block + * group, since it might or might not have a superblock + * backup. */ - rem = (int) ((super->s_blocks_count - super->s_first_data_block) % - super->s_blocks_per_group); - if ((fs->group_desc_count == 1) && rem && (rem < overhead)) - return EXT2_ET_TOOSMALL; + overhead = (int) (2 + fs->inode_blocks_per_group); + if (ext2fs_bg_has_super(fs, fs->group_desc_count - 1)) + overhead += 1 + fs->desc_blocks + super->s_reserved_gdt_blocks; + rem = ((ext2fs_blocks_count(super) - super->s_first_data_block) % + super->s_blocks_per_group); + if ((fs->group_desc_count == 1) && rem && (rem < overhead)) { + retval = EXT2_ET_TOOSMALL; + goto cleanup; + } if (rem && (rem < overhead+50)) { - super->s_blocks_count -= rem; + ext2fs_blocks_count_set(super, ext2fs_blocks_count(super) - + rem); + goto retry; } @@ -229,25 +397,26 @@ retry: * count. */ - retval = ext2fs_get_mem(strlen(fs->device_name) + 80, - (void **) &buf); + retval = ext2fs_get_mem(strlen(fs->device_name) + 80, &buf); if (retval) goto cleanup; - - sprintf(buf, "block bitmap for %s", fs->device_name); - retval = ext2fs_allocate_block_bitmap(fs, buf, &fs->block_map); + + strcpy(buf, "block bitmap for "); + strcat(buf, fs->device_name); + retval = ext2fs_allocate_subcluster_bitmap(fs, buf, &fs->block_map); if (retval) goto cleanup; - - sprintf(buf, "inode bitmap for %s", fs->device_name); + + strcpy(buf, "inode bitmap for "); + strcat(buf, fs->device_name); retval = ext2fs_allocate_inode_bitmap(fs, buf, &fs->inode_map); if (retval) goto cleanup; - ext2fs_free_mem((void **) &buf); + ext2fs_free_mem(&buf); - retval = ext2fs_get_mem((size_t) fs->desc_blocks * fs->blocksize, - (void **) &fs->group_desc); + retval = ext2fs_get_array(fs->desc_blocks, fs->blocksize, + &fs->group_desc); if (retval) goto cleanup; @@ -259,49 +428,59 @@ retry: * Note that although the block bitmap, inode bitmap, and * inode table have not been allocated (and in fact won't be * by this routine), they are accounted for nevertheless. + * + * If FLEX_BG meta-data grouping is used, only account for the + * superblock and group descriptors (the inode tables and + * bitmaps will be accounted for when allocated). */ - group_block = super->s_first_data_block; - super->s_free_blocks_count = 0; + free_blocks = 0; + csum_flag = EXT2_HAS_RO_COMPAT_FEATURE(fs->super, + EXT4_FEATURE_RO_COMPAT_GDT_CSUM); for (i = 0; i < fs->group_desc_count; i++) { - if (i == fs->group_desc_count-1) { - numblocks = (fs->super->s_blocks_count - - fs->super->s_first_data_block) % - fs->super->s_blocks_per_group; - if (!numblocks) - numblocks = fs->super->s_blocks_per_group; - } else - numblocks = fs->super->s_blocks_per_group; - - if (ext2fs_bg_has_super(fs, i)) { - for (j=0; j < fs->desc_blocks+1; j++) - ext2fs_mark_block_bitmap(fs->block_map, - group_block + j); - numblocks -= 1 + fs->desc_blocks; + /* + * Don't set the BLOCK_UNINIT group for the last group + * because the block bitmap needs to be padded. + */ + if (csum_flag) { + if (i != fs->group_desc_count - 1) + ext2fs_bg_flags_set(fs, i, + EXT2_BG_BLOCK_UNINIT); + ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT); + numblocks = super->s_inodes_per_group; + if (i == 0) + numblocks -= super->s_first_ino; + ext2fs_bg_itable_unused_set(fs, i, numblocks); } - - numblocks -= 2 + fs->inode_blocks_per_group; - - super->s_free_blocks_count += numblocks; - fs->group_desc[i].bg_free_blocks_count = numblocks; - fs->group_desc[i].bg_free_inodes_count = - fs->super->s_inodes_per_group; - fs->group_desc[i].bg_used_dirs_count = 0; - - group_block += super->s_blocks_per_group; + numblocks = ext2fs_reserve_super_and_bgd(fs, i, fs->block_map); + if (fs->super->s_log_groups_per_flex) + numblocks += 2 + fs->inode_blocks_per_group; + + free_blocks += numblocks; + ext2fs_bg_free_blocks_count_set(fs, i, numblocks); + ext2fs_bg_free_inodes_count_set(fs, i, fs->super->s_inodes_per_group); + ext2fs_bg_used_dirs_count_set(fs, i, 0); + ext2fs_group_desc_csum_set(fs, i); + } + free_blocks &= ~EXT2FS_CLUSTER_MASK(fs); + ext2fs_free_blocks_count_set(super, free_blocks); + + c = (char) 255; + if (((int) c) == -1) { + super->s_flags |= EXT2_FLAGS_SIGNED_HASH; + } else { + super->s_flags |= EXT2_FLAGS_UNSIGNED_HASH; } - + ext2fs_mark_super_dirty(fs); ext2fs_mark_bb_dirty(fs); ext2fs_mark_ib_dirty(fs); - + io_channel_set_blksize(fs->io, fs->blocksize); *ret_fs = fs; return 0; cleanup: + free(buf); ext2fs_free(fs); return retval; } - - -