Subject: + hfsplus-implement-functionality-of-transactions-block-check.patch added to -mm tree To: slava@xxxxxxxxxxx,hch@xxxxxxxxxxxxx,htl10@xxxxxxxxxxxxxxxxxxxxx,viro@xxxxxxxxxxxxxxxxxx From: akpm@xxxxxxxxxxxxxxxxxxxx Date: Tue, 04 Feb 2014 14:33:42 -0800 The patch titled Subject: hfsplus: implement functionality of transaction's block check has been added to the -mm tree. Its filename is hfsplus-implement-functionality-of-transactions-block-check.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/hfsplus-implement-functionality-of-transactions-block-check.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/hfsplus-implement-functionality-of-transactions-block-check.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Vyacheslav Dubeyko <slava@xxxxxxxxxxx> Subject: hfsplus: implement functionality of transaction's block check A group of related changes is called a transaction. When all of the changes of a transaction have been written to their normal locations on disk, that transaction has been committed, and is removed from the journal. The journal may contain several transactions. Copying changes from all transactions to their normal locations on disk is called replaying the journal. A single transaction consists of several blocks, including both the data to be written, and the location where that data is to be written. This is represented on disk by a block list header, which describes the number and sizes of the blocks, immediately followed by the contents of those blocks. This patch implements method of checking description of transaction's block before replaying of it. Signed-off-by: Vyacheslav Dubeyko <slava@xxxxxxxxxxx> Tested-by: Hin-Tak Leung <htl10@xxxxxxxxxxxxxxxxxxxxx> Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx> Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/hfsplus/journal.c | 100 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 100 insertions(+) diff -puN fs/hfsplus/journal.c~hfsplus-implement-functionality-of-transactions-block-check fs/hfsplus/journal.c --- a/fs/hfsplus/journal.c~hfsplus-implement-functionality-of-transactions-block-check +++ a/fs/hfsplus/journal.c @@ -38,6 +38,11 @@ (be64_to_cpu(((struct hfsplus_journal *)(jnl))->jib->offset) >> \ HFSPLUS_SB(sb)->alloc_blksz_shift) +#define JOURNAL_OFF_TO_SEC(sb) \ + (HFSPLUS_SB(sb)->blockoffset + \ + ((be64_to_cpu(HFSPLUS_SB(sb)->jnl->jib->offset) + \ + le64_to_cpu(HFSPLUS_SB(sb)->jnl->jh->start)) >> \ + HFSPLUS_SECTOR_SHIFT)) #define BLOCK_TO_SEC(sb, blk) \ ((sector_t)(blk) << \ (HFSPLUS_SB(sb)->alloc_blksz_shift - HFSPLUS_SECTOR_SHIFT)) @@ -490,6 +495,101 @@ struct hfsplus_block_info *hfsplus_get_b return &desc->binfo[diff]; } +static int hfsplus_check_transaction_block(struct super_block *sb, int i, + struct hfsplus_blist_desc *desc) +{ + struct hfsplus_journal *jnl = HFSPLUS_SB(sb)->jnl; + struct hfsplus_journal_header *jh = jnl->jh; + struct hfsplus_blhdr *blhdr = &desc->blhdr; + struct hfsplus_block_info *binfo; + sector_t sec; + u32 size; + u32 checksum = 0; + + hfs_dbg(JREPLAY, "check binfo[%u]\n", i); + + binfo = hfsplus_get_binfo(sb, i, desc); + if (!binfo) { + pr_err("unable to get binfo[%u]\n", i); + return -EIO; + } + + if (BNUM(binfo) == ~(u64)0) { + hfs_dbg(JREPLAY, "don't add *killed* block %llu\n", + BNUM(binfo)); + return 0; /* don't add "killed" blocks */ + } + + BUG_ON(BSIZE(binfo) % HFSPLUS_SECTOR_SIZE); + + if ((BSIZE(binfo) / HFSPLUS_SECTOR_SIZE) == 0) { + pr_warn("transaction block size is not aligned\n"); + return -EINVAL; + } + + sec = JOURNAL_OFF_TO_SEC(sb); + size = BSIZE(binfo); + while (size > 0) { + void *block_ptr; + size_t check_size = HFSPLUS_SECTOR_SIZE; + size_t rest_bytes; + int err; + + if (need_to_wrap_journal(jh, TR_START(jh), check_size)) { + hfsplus_wrap_journal(sb, TR_START(jh), check_size); + sec = JOURNAL_OFF_TO_SEC(sb); + } + + err = hfsplus_submit_bio(sb, sec, desc->src_buf, + (void **)&block_ptr, + READA, &rest_bytes); + if (err) { + pr_err("unable to read sector %lu of blist\n", sec); + return err; + } + + BUG_ON(rest_bytes < HFSPLUS_SECTOR_SIZE); + + if (TR_START(jh) > LAST_TR_END(jh)) { + if ((TR_START(jh) + check_size) > JOURNAL_SIZE(jh)) + err = -EIO; + } else if (TR_START(jh) < LAST_TR_END(jh)) { + if ((TR_START(jh) + check_size) > LAST_TR_END(jh)) + err = -EIO; + } else /* start == end */ + err = -EIO; + + if (err) { + pr_err("invalid transaction: start %llu, end %llu, journal size %llu, bsize %zu\n", + TR_START(jh), LAST_TR_END(jh), + JOURNAL_SIZE(jh), check_size); + return err; + } + + if (NEED_CHECK_CSUM(blhdr)) { + checksum = calc_internal_checksum(checksum, + block_ptr, + check_size); + } + + size -= check_size; + le64_add_cpu(&jh->start, check_size); + sec = JOURNAL_OFF_TO_SEC(sb); + } + + if (NEED_CHECK_CSUM(blhdr)) { + if (HFSPLUS_CHECKSUM(checksum) != binfo->block.checksum) { + pr_err("invalid transaction's checksum\n"); + hfs_dbg(JREPLAY, "calc checksum: %#x, checksum: %#x\n", + le32_to_cpu(HFSPLUS_CHECKSUM(checksum)), + le32_to_cpu(binfo->block.checksum)); + return -EIO; + } + } + + return 0; +} + static inline bool hfsplus_journal_empty(struct hfsplus_journal_header *jh) { _ Patches currently in -mm which might be from slava@xxxxxxxxxxx are hfsplus-add-necessary-declarations-for-journal-replay.patch hfsplus-rework-hfsplus_submit_bio-method.patch hfsplus-implement-init-destroy-journal-object-functionality.patch hfsplus-implement-functionality-for-hfsplus_journal_need_init-flag.patch hfsplus-implement-norecovery-mount-option-support.patch hfsplus-fix-remount-issue.patch hfsplus-implement-check-consistency-of-journal-log-file.patch hfsplus-introduce-descriptor-of-block-list-buffer.patch hfsplus-implement-get-and-verify-block-list-header-functionality.patch hfsplus-implement-functionality-of-getting-transactions-block-info.patch hfsplus-implement-functionality-of-journal-log-wrapping.patch hfsplus-implement-functionality-of-transactions-block-check.patch hfsplus-implement-replay-transactions-block-functionality.patch hfsplus-implement-replay-journal-functionality.patch hfsplus-integrate-journal-replay-support-into-driver.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html