X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=lib%2Fext2fs%2Fopenfs.c;h=0cefe3fdfff3d854dbf0ecdb7534efc0a61e46cd;hb=3fcd8fe8acb269598390b35bbf6e4247d10bc64e;hp=cc98311a3298f32e704bb2bd9c708576f7fbfdb8;hpb=c180ac86533bcbfb1560bd4aa01464785a760f70;p=tools%2Fe2fsprogs.git diff --git a/lib/ext2fs/openfs.c b/lib/ext2fs/openfs.c index cc98311..0cefe3f 100644 --- a/lib/ext2fs/openfs.c +++ b/lib/ext2fs/openfs.c @@ -1,14 +1,15 @@ /* * openfs.c --- open an ext2 filesystem - * + * * Copyright (C) 1993, 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 @@ -22,58 +23,143 @@ #if HAVE_SYS_TYPES_H #include #endif +#ifdef HAVE_ERRNO_H +#include +#endif -#if EXT2_FLAT_INCLUDES #include "ext2_fs.h" -#else -#include -#endif + #include "ext2fs.h" +#include "e2image.h" + +blk64_t ext2fs_descriptor_block_loc2(ext2_filsys fs, blk64_t group_block, + dgrp_t i) +{ + int bg; + int has_super = 0; + blk64_t ret_blk; + + if (!(fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) || + (i < fs->super->s_first_meta_bg)) + return (group_block + i + 1); + + bg = EXT2_DESC_PER_BLOCK(fs->super) * i; + if (ext2fs_bg_has_super(fs, bg)) + has_super = 1; + ret_blk = ext2fs_group_first_block2(fs, bg) + has_super; + /* + * If group_block is not the normal value, we're trying to use + * the backup group descriptors and superblock --- so use the + * alternate location of the second block group in the + * metablock group. Ideally we should be testing each bg + * descriptor block individually for correctness, but we don't + * have the infrastructure in place to do that. + */ + if (group_block != fs->super->s_first_data_block && + ((ret_blk + fs->super->s_blocks_per_group) < + ext2fs_blocks_count(fs->super))) + ret_blk += fs->super->s_blocks_per_group; + return ret_blk; +} + +blk_t ext2fs_descriptor_block_loc(ext2_filsys fs, blk_t group_block, dgrp_t i) +{ + return ext2fs_descriptor_block_loc2(fs, group_block, i); +} + +errcode_t ext2fs_open(const char *name, int flags, int superblock, + unsigned int block_size, io_manager manager, + ext2_filsys *ret_fs) +{ + return ext2fs_open2(name, 0, flags, superblock, block_size, + manager, ret_fs); +} /* * Note: if superblock is non-zero, block-size must also be non-zero. * Superblock and block_size can be zero to use the default size. * * Valid flags for ext2fs_open() - * + * * EXT2_FLAG_RW - Open the filesystem for read/write. * EXT2_FLAG_FORCE - Open the filesystem even if some of the - * features aren't supported. + * features aren't supported. + * EXT2_FLAG_JOURNAL_DEV_OK - Open an ext3 journal device + * EXT2_FLAG_SKIP_MMP - Open without multi-mount protection check. */ -errcode_t ext2fs_open(const char *name, int flags, int superblock, - int block_size, io_manager manager, ext2_filsys *ret_fs) +errcode_t ext2fs_open2(const char *name, const char *io_options, + int flags, int superblock, + unsigned int block_size, io_manager manager, + ext2_filsys *ret_fs) { ext2_filsys fs; errcode_t retval; - int i, j, groups_per_block; - blk_t group_block; - char *dest; + unsigned long i, first_meta_bg; + __u32 features; + unsigned int groups_per_block, blocks_per_group, io_flags; + blk64_t group_block, blk; + char *dest, *cp; +#ifdef WORDS_BIGENDIAN struct ext2_group_desc *gdp; - struct ext2fs_sb *s; - + int j; +#endif + EXT2_CHECK_MAGIC(manager, EXT2_ET_MAGIC_IO_MANAGER); - retval = ext2fs_get_mem(sizeof(struct struct_ext2_filsys), - (void **) &fs); + 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; - retval = manager->open(name, (flags & EXT2_FLAG_RW) ? IO_FLAG_RW : 0, - &fs->io); + /* don't overwrite sb backups unless flag is explicitly cleared */ + fs->flags |= EXT2_FLAG_MASTER_SB_ONLY; + fs->umask = 022; + retval = ext2fs_get_mem(strlen(name)+1, &fs->device_name); if (retval) goto cleanup; - fs->io->app_data = fs; - retval = ext2fs_get_mem(strlen(name)+1, (void **) &fs->device_name); + strcpy(fs->device_name, name); + cp = strchr(fs->device_name, '?'); + if (!io_options && cp) { + *cp++ = 0; + io_options = cp; + } + + io_flags = 0; + if (flags & EXT2_FLAG_RW) + io_flags |= IO_FLAG_RW; + if (flags & EXT2_FLAG_EXCLUSIVE) + io_flags |= IO_FLAG_EXCLUSIVE; + if (flags & EXT2_FLAG_DIRECT_IO) + io_flags |= IO_FLAG_DIRECT_IO; + retval = manager->open(fs->device_name, io_flags, &fs->io); if (retval) goto cleanup; - strcpy(fs->device_name, name); - retval = ext2fs_get_mem(SUPERBLOCK_SIZE, (void **) &fs->super); + if (io_options && + (retval = io_channel_set_options(fs->io, io_options))) + goto cleanup; + fs->image_io = fs->io; + fs->io->app_data = fs; + retval = ext2fs_get_memalign(SUPERBLOCK_SIZE, 512, &fs->super); if (retval) goto cleanup; + if (flags & EXT2_FLAG_IMAGE_FILE) { + retval = ext2fs_get_mem(sizeof(struct ext2_image_hdr), + &fs->image_header); + if (retval) + goto cleanup; + retval = io_channel_read_blk(fs->io, 0, + -(int)sizeof(struct ext2_image_hdr), + fs->image_header); + if (retval) + goto cleanup; + if (fs->image_header->magic_number != EXT2_ET_MAGIC_E2IMAGE) + return EXT2_ET_MAGIC_E2IMAGE; + superblock = 1; + block_size = fs->image_header->fs_blocksize; + } /* * If the user specifies a specific block # for the @@ -90,14 +176,13 @@ errcode_t ext2fs_open(const char *name, int flags, int superblock, goto cleanup; } io_channel_set_blksize(fs->io, block_size); - group_block = superblock + 1; + group_block = superblock; fs->orig_super = 0; } else { io_channel_set_blksize(fs->io, SUPERBLOCK_OFFSET); superblock = 1; group_block = 0; - retval = ext2fs_get_mem(SUPERBLOCK_SIZE, - (void **) &fs->orig_super); + retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &fs->orig_super); if (retval) goto cleanup; } @@ -108,54 +193,82 @@ errcode_t ext2fs_open(const char *name, int flags, int superblock, if (fs->orig_super) memcpy(fs->orig_super, fs->super, SUPERBLOCK_SIZE); - if ((fs->super->s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC)) || - (fs->flags & EXT2_FLAG_SWAP_BYTES)) { - fs->flags |= EXT2_FLAG_SWAP_BYTES; - - ext2fs_swap_super(fs->super); +#ifdef WORDS_BIGENDIAN + fs->flags |= EXT2_FLAG_SWAP_BYTES; + ext2fs_swap_super(fs->super); +#else + if (fs->flags & EXT2_FLAG_SWAP_BYTES) { + retval = EXT2_ET_UNIMPLEMENTED; + goto cleanup; } - +#endif + if (fs->super->s_magic != EXT2_SUPER_MAGIC) { retval = EXT2_ET_BAD_MAGIC; goto cleanup; } -#ifdef EXT2_DYNAMIC_REV - if (fs->super->s_rev_level > EXT2_DYNAMIC_REV) { - retval = EXT2_ET_REV_TOO_HIGH; - goto cleanup; - } -#else -#ifdef EXT2_CURRENT_REV if (fs->super->s_rev_level > EXT2_LIB_CURRENT_REV) { retval = EXT2_ET_REV_TOO_HIGH; goto cleanup; } -#endif -#endif + /* * Check for feature set incompatibility */ if (!(flags & EXT2_FLAG_FORCE)) { - s = (struct ext2fs_sb *) fs->super; - if (s->s_feature_incompat & ~EXT2_LIB_FEATURE_INCOMPAT_SUPP) { + features = fs->super->s_feature_incompat; +#ifdef EXT2_LIB_SOFTSUPP_INCOMPAT + if (flags & EXT2_FLAG_SOFTSUPP_FEATURES) + features &= ~EXT2_LIB_SOFTSUPP_INCOMPAT; +#endif + if (features & ~EXT2_LIB_FEATURE_INCOMPAT_SUPP) { retval = EXT2_ET_UNSUPP_FEATURE; goto cleanup; } + + features = fs->super->s_feature_ro_compat; +#ifdef EXT2_LIB_SOFTSUPP_RO_COMPAT + if (flags & EXT2_FLAG_SOFTSUPP_FEATURES) + features &= ~EXT2_LIB_SOFTSUPP_RO_COMPAT; +#endif if ((flags & EXT2_FLAG_RW) && - (s->s_feature_ro_compat & - ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP)) { + (features & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP)) { retval = EXT2_ET_RO_UNSUPP_FEATURE; goto cleanup; } + + if (!(flags & EXT2_FLAG_JOURNAL_DEV_OK) && + (fs->super->s_feature_incompat & + EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) { + retval = EXT2_ET_UNSUPP_FEATURE; + goto cleanup; + } + } + + if ((fs->super->s_log_block_size + EXT2_MIN_BLOCK_LOG_SIZE) > + EXT2_MAX_BLOCK_LOG_SIZE) { + retval = EXT2_ET_CORRUPT_SUPERBLOCK; + goto cleanup; + } + if (!EXT2_HAS_RO_COMPAT_FEATURE(fs->super, + EXT4_FEATURE_RO_COMPAT_BIGALLOC) && + (fs->super->s_log_block_size != fs->super->s_log_cluster_size)) { + retval = EXT2_ET_CORRUPT_SUPERBLOCK; + goto cleanup; + } + fs->fragsize = fs->blocksize = EXT2_BLOCK_SIZE(fs->super); + if (EXT2_INODE_SIZE(fs->super) < EXT2_GOOD_OLD_INODE_SIZE) { + retval = EXT2_ET_CORRUPT_SUPERBLOCK; + goto cleanup; } - - fs->blocksize = EXT2_BLOCK_SIZE(fs->super); - if (fs->blocksize == 0) { + fs->cluster_ratio_bits = fs->super->s_log_cluster_size - + fs->super->s_log_block_size; + if (EXT2_BLOCKS_PER_GROUP(fs->super) != + EXT2_CLUSTERS_PER_GROUP(fs->super) << fs->cluster_ratio_bits) { retval = EXT2_ET_CORRUPT_SUPERBLOCK; goto cleanup; } - fs->fragsize = EXT2_FRAG_SIZE(fs->super); - fs->inode_blocks_per_group = ((fs->super->s_inodes_per_group * + fs->inode_blocks_per_group = ((EXT2_INODES_PER_GROUP(fs->super) * EXT2_INODE_SIZE(fs->super) + EXT2_BLOCK_SIZE(fs->super) - 1) / EXT2_BLOCK_SIZE(fs->super)); @@ -169,47 +282,159 @@ errcode_t ext2fs_open(const char *name, int flags, int superblock, * Set the blocksize to the filesystem's blocksize. */ io_channel_set_blksize(fs->io, fs->blocksize); - + + /* + * If this is an external journal device, don't try to read + * the group descriptors, because they're not there. + */ + if (fs->super->s_feature_incompat & + EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) { + fs->group_desc_count = 0; + *ret_fs = fs; + return 0; + } + + if (EXT2_INODES_PER_GROUP(fs->super) == 0) { + retval = EXT2_ET_CORRUPT_SUPERBLOCK; + goto cleanup; + } + /* * Read group descriptors */ - if ((EXT2_BLOCKS_PER_GROUP(fs->super)) == 0) { + blocks_per_group = EXT2_BLOCKS_PER_GROUP(fs->super); + if (blocks_per_group == 0 || + blocks_per_group > EXT2_MAX_BLOCKS_PER_GROUP(fs->super) || + fs->inode_blocks_per_group > EXT2_MAX_INODES_PER_GROUP(fs->super) || + EXT2_DESC_PER_BLOCK(fs->super) == 0 || + fs->super->s_first_data_block >= ext2fs_blocks_count(fs->super)) { + retval = EXT2_ET_CORRUPT_SUPERBLOCK; + goto cleanup; + } + fs->group_desc_count = ext2fs_div64_ceil(ext2fs_blocks_count(fs->super) - + fs->super->s_first_data_block, + blocks_per_group); + if (fs->group_desc_count * EXT2_INODES_PER_GROUP(fs->super) != + fs->super->s_inodes_count) { retval = EXT2_ET_CORRUPT_SUPERBLOCK; goto cleanup; } - fs->group_desc_count = (fs->super->s_blocks_count - - fs->super->s_first_data_block + - EXT2_BLOCKS_PER_GROUP(fs->super) - 1) - / EXT2_BLOCKS_PER_GROUP(fs->super); - fs->desc_blocks = (fs->group_desc_count + - EXT2_DESC_PER_BLOCK(fs->super) - 1) - / EXT2_DESC_PER_BLOCK(fs->super); - retval = ext2fs_get_mem(fs->desc_blocks * fs->blocksize, - (void **) &fs->group_desc); + fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count, + EXT2_DESC_PER_BLOCK(fs->super)); + retval = ext2fs_get_array(fs->desc_blocks, fs->blocksize, + &fs->group_desc); if (retval) goto cleanup; if (!group_block) - group_block = fs->super->s_first_data_block + 1; + group_block = fs->super->s_first_data_block; + if (group_block == 0 && fs->blocksize == 1024) + group_block = 1; /* Deal with 1024 blocksize && bigalloc */ dest = (char *) fs->group_desc; - for (i=0 ; i < fs->desc_blocks; i++) { - retval = io_channel_read_blk(fs->io, group_block, 1, dest); + groups_per_block = EXT2_DESC_PER_BLOCK(fs->super); + if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) + first_meta_bg = fs->super->s_first_meta_bg; + else + first_meta_bg = fs->desc_blocks; + if (first_meta_bg) { + retval = io_channel_read_blk(fs->io, group_block+1, + first_meta_bg, dest); + if (retval) + goto cleanup; +#ifdef WORDS_BIGENDIAN + gdp = (struct ext2_group_desc *) dest; + for (j=0; j < groups_per_block*first_meta_bg; j++) { + gdp = ext2fs_group_desc(fs, fs->group_desc, j); + ext2fs_swap_group_desc2(fs, gdp); + } +#endif + dest += fs->blocksize*first_meta_bg; + } + for (i=first_meta_bg ; i < fs->desc_blocks; i++) { + blk = ext2fs_descriptor_block_loc2(fs, group_block, i); + retval = io_channel_read_blk64(fs->io, blk, 1, dest); if (retval) goto cleanup; - group_block++; - if (fs->flags & EXT2_FLAG_SWAP_BYTES) { - gdp = (struct ext2_group_desc *) dest; - groups_per_block = fs->blocksize / - sizeof(struct ext2_group_desc); - for (j=0; j < groups_per_block; j++) - ext2fs_swap_group_desc(gdp++); +#ifdef WORDS_BIGENDIAN + for (j=0; j < groups_per_block; j++) { + /* The below happens to work... be careful. */ + gdp = ext2fs_group_desc(fs, fs->group_desc, j); + ext2fs_swap_group_desc2(fs, gdp); } +#endif dest += fs->blocksize; } + fs->stride = fs->super->s_raid_stride; + + /* + * If recovery is from backup superblock, Clear _UNININT flags & + * reset bg_itable_unused to zero + */ + if (superblock > 1 && EXT2_HAS_RO_COMPAT_FEATURE(fs->super, + EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { + dgrp_t group; + + for (group = 0; group < fs->group_desc_count; group++) { + ext2fs_bg_flags_clear(fs, group, EXT2_BG_BLOCK_UNINIT); + ext2fs_bg_flags_clear(fs, group, EXT2_BG_INODE_UNINIT); + ext2fs_bg_itable_unused_set(fs, group, 0); + } + ext2fs_mark_super_dirty(fs); + } + + fs->flags &= ~EXT2_FLAG_NOFREE_ON_ERROR; *ret_fs = fs; + + if ((fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_MMP) && + !(flags & EXT2_FLAG_SKIP_MMP) && + (flags & (EXT2_FLAG_RW | EXT2_FLAG_EXCLUSIVE))) { + retval = ext2fs_mmp_start(fs); + if (retval) { + fs->flags |= EXT2_FLAG_SKIP_MMP; /* just do cleanup */ + ext2fs_mmp_stop(fs); + goto cleanup; + } + } + return 0; cleanup: - ext2fs_free(fs); + if (flags & EXT2_FLAG_NOFREE_ON_ERROR) + *ret_fs = fs; + else + ext2fs_free(fs); return retval; } +/* + * Set/get the filesystem data I/O channel. + * + * These functions are only valid if EXT2_FLAG_IMAGE_FILE is true. + */ +errcode_t ext2fs_get_data_io(ext2_filsys fs, io_channel *old_io) +{ + if ((fs->flags & EXT2_FLAG_IMAGE_FILE) == 0) + return EXT2_ET_NOT_IMAGE_FILE; + if (old_io) { + *old_io = (fs->image_io == fs->io) ? 0 : fs->io; + } + return 0; +} + +errcode_t ext2fs_set_data_io(ext2_filsys fs, io_channel new_io) +{ + if ((fs->flags & EXT2_FLAG_IMAGE_FILE) == 0) + return EXT2_ET_NOT_IMAGE_FILE; + fs->io = new_io ? new_io : fs->image_io; + return 0; +} + +errcode_t ext2fs_rewrite_to_io(ext2_filsys fs, io_channel new_io) +{ + if ((fs->flags & EXT2_FLAG_IMAGE_FILE) == 0) + return EXT2_ET_NOT_IMAGE_FILE; + fs->io = fs->image_io = new_io; + fs->flags |= EXT2_FLAG_DIRTY | EXT2_FLAG_RW | + EXT2_FLAG_BB_DIRTY | EXT2_FLAG_IB_DIRTY; + fs->flags &= ~EXT2_FLAG_IMAGE_FILE; + return 0; +}