diff options
Diffstat (limited to 'lib/ext2fs/blknum.c')
| -rw-r--r-- | lib/ext2fs/blknum.c | 606 |
1 files changed, 606 insertions, 0 deletions
diff --git a/lib/ext2fs/blknum.c b/lib/ext2fs/blknum.c new file mode 100644 index 0000000..04839d8 --- /dev/null +++ b/lib/ext2fs/blknum.c @@ -0,0 +1,606 @@ +/* + * blknum.c --- Functions to handle blk64_t and high/low 64-bit block + * number. + * + * Copyright IBM Corporation, 2007 + * Author Jose R. Santos <jrs@us.ibm.com> + * + * %Begin-Header% + * This file may be redistributed under the terms of the GNU Public + * License. + * %End-Header% + */ + +#include "config.h" +#include "ext2fs.h" + +/* + * Return the group # of a block + */ +dgrp_t ext2fs_group_of_blk2(ext2_filsys fs, blk64_t blk) +{ + return (blk - fs->super->s_first_data_block) / + fs->super->s_blocks_per_group; +} + +/* + * Return the first block (inclusive) in a group + */ +blk64_t ext2fs_group_first_block2(ext2_filsys fs, dgrp_t group) +{ + return fs->super->s_first_data_block + + EXT2_GROUPS_TO_BLOCKS(fs->super, group); +} + +/* + * Return the last block (inclusive) in a group + */ +blk64_t ext2fs_group_last_block2(ext2_filsys fs, dgrp_t group) +{ + return (group == fs->group_desc_count - 1 ? + ext2fs_blocks_count(fs->super) - 1 : + ext2fs_group_first_block2(fs, group) + + (fs->super->s_blocks_per_group - 1)); +} + +/* + * Return the number of blocks in a group + */ +int ext2fs_group_blocks_count(ext2_filsys fs, dgrp_t group) +{ + int num_blocks; + + if (group == fs->group_desc_count - 1) { + num_blocks = (ext2fs_blocks_count(fs->super) - + fs->super->s_first_data_block) % + fs->super->s_blocks_per_group; + if (!num_blocks) + num_blocks = fs->super->s_blocks_per_group; + } else + num_blocks = fs->super->s_blocks_per_group; + + return num_blocks; +} + +/* + * Return the inode data block count + */ +blk64_t ext2fs_inode_data_blocks2(ext2_filsys fs, + struct ext2_inode *inode) +{ + return (inode->i_blocks | + (ext2fs_has_feature_huge_file(fs->super) ? + (__u64) inode->osd2.linux2.l_i_blocks_hi << 32 : 0)) - + (inode->i_file_acl ? EXT2_CLUSTER_SIZE(fs->super) >> 9 : 0); +} + +/* + * Return the inode i_blocks count + */ +blk64_t ext2fs_inode_i_blocks(ext2_filsys fs, + struct ext2_inode *inode) +{ + return (inode->i_blocks | + (ext2fs_has_feature_huge_file(fs->super) ? + (__u64)inode->osd2.linux2.l_i_blocks_hi << 32 : 0)); +} + +/* + * Return the inode i_blocks in stat (512 byte) units + */ +blk64_t ext2fs_get_stat_i_blocks(ext2_filsys fs, + struct ext2_inode *inode) +{ + blk64_t ret = inode->i_blocks; + + if (ext2fs_has_feature_huge_file(fs->super)) { + ret += ((long long) inode->osd2.linux2.l_i_blocks_hi) << 32; + if (inode->i_flags & EXT4_HUGE_FILE_FL) + ret *= (fs->blocksize / 512); + } + return ret; +} + +/* + * Return the fs block count + */ +blk64_t ext2fs_blocks_count(struct ext2_super_block *super) +{ + return super->s_blocks_count | + (ext2fs_has_feature_64bit(super) ? + (__u64) super->s_blocks_count_hi << 32 : 0); +} + +/* + * Set the fs block count + */ +void ext2fs_blocks_count_set(struct ext2_super_block *super, blk64_t blk) +{ + super->s_blocks_count = blk; + if (ext2fs_has_feature_64bit(super)) + super->s_blocks_count_hi = (__u64) blk >> 32; +} + +/* + * Add to the current fs block count + */ +void ext2fs_blocks_count_add(struct ext2_super_block *super, blk64_t blk) +{ + blk64_t tmp; + tmp = ext2fs_blocks_count(super) + blk; + ext2fs_blocks_count_set(super, tmp); +} + +/* + * Return the fs reserved block count + */ +blk64_t ext2fs_r_blocks_count(struct ext2_super_block *super) +{ + return super->s_r_blocks_count | + (ext2fs_has_feature_64bit(super) ? + (__u64) super->s_r_blocks_count_hi << 32 : 0); +} + +/* + * Set the fs reserved block count + */ +void ext2fs_r_blocks_count_set(struct ext2_super_block *super, blk64_t blk) +{ + super->s_r_blocks_count = blk; + if (ext2fs_has_feature_64bit(super)) + super->s_r_blocks_count_hi = (__u64) blk >> 32; +} + +/* + * Add to the current reserved fs block count + */ +void ext2fs_r_blocks_count_add(struct ext2_super_block *super, blk64_t blk) +{ + blk64_t tmp; + tmp = ext2fs_r_blocks_count(super) + blk; + ext2fs_r_blocks_count_set(super, tmp); +} + +/* + * Return the fs free block count + */ +blk64_t ext2fs_free_blocks_count(struct ext2_super_block *super) +{ + return super->s_free_blocks_count | + (ext2fs_has_feature_64bit(super) ? + (__u64) super->s_free_blocks_hi << 32 : 0); +} + +/* + * Set the fs free block count + */ +void ext2fs_free_blocks_count_set(struct ext2_super_block *super, blk64_t blk) +{ + super->s_free_blocks_count = blk; + if (ext2fs_has_feature_64bit(super)) + super->s_free_blocks_hi = (__u64) blk >> 32; +} + +/* + * Add to the current free fs block count + */ +void ext2fs_free_blocks_count_add(struct ext2_super_block *super, blk64_t blk) +{ + blk64_t tmp; + tmp = ext2fs_free_blocks_count(super) + blk; + ext2fs_free_blocks_count_set(super, tmp); +} + +/* + * Get a pointer to a block group descriptor. We need the explicit + * pointer to the group desc for code that swaps block group + * descriptors before writing them out, as it wants to make a copy and + * do the swap there. + */ +struct ext2_group_desc *ext2fs_group_desc(ext2_filsys fs, + struct opaque_ext2_group_desc *gdp, + dgrp_t group) +{ + struct ext2_group_desc *ret_gdp; + errcode_t retval; + static char *buf = 0; + static unsigned bufsize = 0; + blk64_t blk; + int desc_size = EXT2_DESC_SIZE(fs->super) & ~7; + int desc_per_blk = EXT2_DESC_PER_BLOCK(fs->super); + + if (group > fs->group_desc_count) + return NULL; + if (gdp) + return (struct ext2_group_desc *)((char *)gdp + + group * desc_size); + /* + * If fs->group_desc wasn't read in when the file system was + * opened, then read it on demand here. + */ + if (bufsize < fs->blocksize) + ext2fs_free_mem(&buf); + if (!buf) { + retval = ext2fs_get_mem(fs->blocksize, &buf); + if (retval) + return NULL; + bufsize = fs->blocksize; + } + blk = ext2fs_descriptor_block_loc2(fs, fs->super->s_first_data_block, + group / desc_per_blk); + retval = io_channel_read_blk(fs->io, blk, 1, buf); + if (retval) + return NULL; + ret_gdp = (struct ext2_group_desc *) + (buf + ((group % desc_per_blk) * desc_size)); +#ifdef WORDS_BIGENDIAN + ext2fs_swap_group_desc2(fs, ret_gdp); +#endif + return ret_gdp; +} + +/* Do the same but as an ext4 group desc for internal use here */ +static struct ext4_group_desc *ext4fs_group_desc(ext2_filsys fs, + struct opaque_ext2_group_desc *gdp, + dgrp_t group) +{ + return (struct ext4_group_desc *)ext2fs_group_desc(fs, gdp, group); +} + +/* + * Return the block bitmap checksum of a group + */ +__u32 ext2fs_block_bitmap_checksum(ext2_filsys fs, dgrp_t group) +{ + struct ext4_group_desc *gdp; + __u32 csum; + + gdp = ext4fs_group_desc(fs, fs->group_desc, group); + csum = gdp->bg_block_bitmap_csum_lo; + if (EXT2_DESC_SIZE(fs->super) >= EXT4_BG_BLOCK_BITMAP_CSUM_HI_LOCATION) + csum |= ((__u32)gdp->bg_block_bitmap_csum_hi << 16); + return csum; +} + +/* + * Return the block bitmap block of a group + */ +blk64_t ext2fs_block_bitmap_loc(ext2_filsys fs, dgrp_t group) +{ + struct ext4_group_desc *gdp; + + gdp = ext4fs_group_desc(fs, fs->group_desc, group); + return gdp->bg_block_bitmap | + (ext2fs_has_feature_64bit(fs->super) ? + (__u64)gdp->bg_block_bitmap_hi << 32 : 0); +} + +/* + * Set the block bitmap block of a group + */ +void ext2fs_block_bitmap_loc_set(ext2_filsys fs, dgrp_t group, blk64_t blk) +{ + struct ext4_group_desc *gdp; + + gdp = ext4fs_group_desc(fs, fs->group_desc, group); + gdp->bg_block_bitmap = blk; + if (ext2fs_has_feature_64bit(fs->super)) + gdp->bg_block_bitmap_hi = (__u64) blk >> 32; +} + +/* + * Return the inode bitmap checksum of a group + */ +__u32 ext2fs_inode_bitmap_checksum(ext2_filsys fs, dgrp_t group) +{ + struct ext4_group_desc *gdp; + __u32 csum; + + gdp = ext4fs_group_desc(fs, fs->group_desc, group); + csum = gdp->bg_inode_bitmap_csum_lo; + if (EXT2_DESC_SIZE(fs->super) >= EXT4_BG_INODE_BITMAP_CSUM_HI_END) + csum |= ((__u32)gdp->bg_inode_bitmap_csum_hi << 16); + return csum; +} + +/* + * Return the inode bitmap block of a group + */ +blk64_t ext2fs_inode_bitmap_loc(ext2_filsys fs, dgrp_t group) +{ + struct ext4_group_desc *gdp; + + gdp = ext4fs_group_desc(fs, fs->group_desc, group); + return gdp->bg_inode_bitmap | + (ext2fs_has_feature_64bit(fs->super) ? + (__u64) gdp->bg_inode_bitmap_hi << 32 : 0); +} + +/* + * Set the inode bitmap block of a group + */ +void ext2fs_inode_bitmap_loc_set(ext2_filsys fs, dgrp_t group, blk64_t blk) +{ + struct ext4_group_desc *gdp; + + gdp = ext4fs_group_desc(fs, fs->group_desc, group); + gdp->bg_inode_bitmap = blk; + if (ext2fs_has_feature_64bit(fs->super)) + gdp->bg_inode_bitmap_hi = (__u64) blk >> 32; +} + +/* + * Return the inode table block of a group + */ +blk64_t ext2fs_inode_table_loc(ext2_filsys fs, dgrp_t group) +{ + struct ext4_group_desc *gdp; + + gdp = ext4fs_group_desc(fs, fs->group_desc, group); + return gdp->bg_inode_table | + (ext2fs_has_feature_64bit(fs->super) ? + (__u64) gdp->bg_inode_table_hi << 32 : 0); +} + +/* + * Set the inode table block of a group + */ +void ext2fs_inode_table_loc_set(ext2_filsys fs, dgrp_t group, blk64_t blk) +{ + struct ext4_group_desc *gdp; + + gdp = ext4fs_group_desc(fs, fs->group_desc, group); + gdp->bg_inode_table = blk; + if (ext2fs_has_feature_64bit(fs->super)) + gdp->bg_inode_table_hi = (__u64) blk >> 32; +} + +/* + * Return the free blocks count of a group + */ +__u32 ext2fs_bg_free_blocks_count(ext2_filsys fs, dgrp_t group) +{ + struct ext4_group_desc *gdp; + + gdp = ext4fs_group_desc(fs, fs->group_desc, group); + return gdp->bg_free_blocks_count | + (ext2fs_has_feature_64bit(fs->super) ? + (__u32) gdp->bg_free_blocks_count_hi << 16 : 0); +} + +/* + * Set the free blocks count of a group + */ +void ext2fs_bg_free_blocks_count_set(ext2_filsys fs, dgrp_t group, __u32 n) +{ + struct ext4_group_desc *gdp; + + gdp = ext4fs_group_desc(fs, fs->group_desc, group); + gdp->bg_free_blocks_count = n; + + if (ext2fs_has_feature_64bit(fs->super)) + gdp->bg_free_blocks_count_hi = (__u32) n >> 16; +} + +/* + * Return the free inodes count of a group + */ +__u32 ext2fs_bg_free_inodes_count(ext2_filsys fs, dgrp_t group) +{ + struct ext4_group_desc *gdp; + + gdp = ext4fs_group_desc(fs, fs->group_desc, group); + return gdp->bg_free_inodes_count | + (ext2fs_has_feature_64bit(fs->super) ? + (__u32) gdp->bg_free_inodes_count_hi << 16 : 0); +} + +/* + * Set the free inodes count of a group + */ +void ext2fs_bg_free_inodes_count_set(ext2_filsys fs, dgrp_t group, __u32 n) +{ + struct ext4_group_desc *gdp; + + gdp = ext4fs_group_desc(fs, fs->group_desc, group); + gdp->bg_free_inodes_count = n; + if (ext2fs_has_feature_64bit(fs->super)) + gdp->bg_free_inodes_count_hi = (__u32) n >> 16; +} + +/* + * Return the used dirs count of a group + */ +__u32 ext2fs_bg_used_dirs_count(ext2_filsys fs, dgrp_t group) +{ + struct ext4_group_desc *gdp; + + gdp = ext4fs_group_desc(fs, fs->group_desc, group); + return gdp->bg_used_dirs_count | + (ext2fs_has_feature_64bit(fs->super) ? + (__u32) gdp->bg_used_dirs_count_hi << 16 : 0); +} + +/* + * Set the used dirs count of a group + */ +void ext2fs_bg_used_dirs_count_set(ext2_filsys fs, dgrp_t group, __u32 n) +{ + struct ext4_group_desc *gdp; + + gdp = ext4fs_group_desc(fs, fs->group_desc, group); + gdp->bg_used_dirs_count = n; + if (ext2fs_has_feature_64bit(fs->super)) + gdp->bg_used_dirs_count_hi = (__u32) n >> 16; +} + +/* + * Return the unused inodes count of a group + */ +__u32 ext2fs_bg_itable_unused(ext2_filsys fs, dgrp_t group) +{ + struct ext4_group_desc *gdp; + + gdp = ext4fs_group_desc(fs, fs->group_desc, group); + return gdp->bg_itable_unused | + (ext2fs_has_feature_64bit(fs->super) ? + (__u32) gdp->bg_itable_unused_hi << 16 : 0); +} + +/* + * Set the unused inodes count of a group + */ +void ext2fs_bg_itable_unused_set(ext2_filsys fs, dgrp_t group, __u32 n) +{ + struct ext4_group_desc *gdp; + + gdp = ext4fs_group_desc(fs, fs->group_desc, group); + gdp->bg_itable_unused = n; + if (ext2fs_has_feature_64bit(fs->super)) + gdp->bg_itable_unused_hi = (__u32) n >> 16; +} + +/* + * Get the flags for this block group + */ +__u16 ext2fs_bg_flags(ext2_filsys fs, dgrp_t group) +{ + struct ext4_group_desc *gdp; + + gdp = ext4fs_group_desc(fs, fs->group_desc, group); + return gdp->bg_flags; +} + +/* + * Zero out the flags for this block group + */ +void ext2fs_bg_flags_zap(ext2_filsys fs, dgrp_t group) +{ + struct ext4_group_desc *gdp; + + gdp = ext4fs_group_desc(fs, fs->group_desc, group); + gdp->bg_flags = 0; + return; +} + +/* + * Get the value of a particular flag for this block group + */ +int ext2fs_bg_flags_test(ext2_filsys fs, dgrp_t group, __u16 bg_flag) +{ + struct ext4_group_desc *gdp; + + gdp = ext4fs_group_desc(fs, fs->group_desc, group); + return gdp->bg_flags & bg_flag; +} + +/* + * Set a flag or set of flags for this block group + */ +void ext2fs_bg_flags_set(ext2_filsys fs, dgrp_t group, __u16 bg_flags) +{ + struct ext4_group_desc *gdp; + + gdp = ext4fs_group_desc(fs, fs->group_desc, group); + gdp->bg_flags |= bg_flags; + return; +} + +/* + * Clear a flag or set of flags for this block group + */ +void ext2fs_bg_flags_clear(ext2_filsys fs, dgrp_t group, __u16 bg_flags) +{ + struct ext4_group_desc *gdp; + + gdp = ext4fs_group_desc(fs, fs->group_desc, group); + gdp->bg_flags &= ~bg_flags; + return; +} + +/* + * Get the checksum for this block group + */ +__u16 ext2fs_bg_checksum(ext2_filsys fs, dgrp_t group) +{ + struct ext4_group_desc *gdp; + + gdp = ext4fs_group_desc(fs, fs->group_desc, group); + return gdp->bg_checksum; +} + +/* + * Set the checksum for this block group to a previously calculated value + */ +void ext2fs_bg_checksum_set(ext2_filsys fs, dgrp_t group, __u16 checksum) +{ + struct ext4_group_desc *gdp; + + gdp = ext4fs_group_desc(fs, fs->group_desc, group); + gdp->bg_checksum = checksum; + return; +} + +/* + * Get the acl block of a file + */ +blk64_t ext2fs_file_acl_block(ext2_filsys fs, const struct ext2_inode *inode) +{ + blk64_t blk = inode->i_file_acl; + + if (fs && ext2fs_has_feature_64bit(fs->super)) + blk |= ((__u64) inode->osd2.linux2.l_i_file_acl_high) << 32; + return blk; +} + +/* + * Set the acl block of a file + */ +void ext2fs_file_acl_block_set(ext2_filsys fs, struct ext2_inode *inode, + blk64_t blk) +{ + inode->i_file_acl = blk; + if (fs && ext2fs_has_feature_64bit(fs->super)) + inode->osd2.linux2.l_i_file_acl_high = (__u64) blk >> 32; +} + +/* + * Set the size of the inode + */ +errcode_t ext2fs_inode_size_set(ext2_filsys fs, struct ext2_inode *inode, + ext2_off64_t size) +{ + if (size < 0) + return EINVAL; + + /* If writing a large inode, set the large_file or large_dir flag */ + if (ext2fs_needs_large_file_feature(size)) { + int dirty_sb = 0; + + if (LINUX_S_ISREG(inode->i_mode)) { + if (!ext2fs_has_feature_large_file(fs->super)) { + ext2fs_set_feature_large_file(fs->super); + dirty_sb = 1; + } + } else if (LINUX_S_ISDIR(inode->i_mode)) { + if (!ext2fs_has_feature_largedir(fs->super)) { + ext2fs_set_feature_largedir(fs->super); + dirty_sb = 1; + } + } else { + /* Only regular files get to be larger than 4GB */ + return EXT2_ET_FILE_TOO_BIG; + } + if (dirty_sb) { + if (fs->super->s_rev_level == EXT2_GOOD_OLD_REV) + ext2fs_update_dynamic_rev(fs); + ext2fs_mark_super_dirty(fs); + } + } + + inode->i_size = size & 0xffffffff; + inode->i_size_high = (size >> 32); + + return 0; +} + |