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Message-ID: <20140501231347.31890.92245.stgit@birch.djwong.org> Date: Thu, 01 May 2014 16:13:47 -0700 From: "Darrick J. Wong" <darrick.wong@...cle.com> To: tytso@....edu, darrick.wong@...cle.com Cc: linux-ext4@...r.kernel.org Subject: [PATCH 13/37] e2fsck: write dir blocks after new inode when reconstructing root/lost+found If we trash the root directory block, e2fsck will find inode 11 (the old lost+found) and try to attach it to l+f. The lost+found checker also fails to find l+f and tries to add one to the root dir. The root dir is not found but is recreated with incorrect checksums, so linking in the l+f dir fails and the l+f '..' entry isn't set. Since both dirs now fail checksum verification, they're both referred to rehash to have that fixed, but because l+f doesn't have a '..' entry, rehash crashes because l+f has < 2 entries. On a checksumming filesystem, the routines in e2fsck that recreate /lost+found and / must write the new directory block *after* the inode has been written to disk because the checksum depends on i_generation. Add a regression test while we're at it. Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com> --- e2fsck/pass3.c | 85 +++++---- tests/f_rebuild_csum_rootdir/expect.1 | 311 +++++++++++++++++++++++++++++++++ tests/f_rebuild_csum_rootdir/expect.2 | 7 + tests/f_rebuild_csum_rootdir/image.gz | Bin tests/f_rebuild_csum_rootdir/name | 1 5 files changed, 364 insertions(+), 40 deletions(-) create mode 100644 tests/f_rebuild_csum_rootdir/expect.1 create mode 100644 tests/f_rebuild_csum_rootdir/expect.2 create mode 100644 tests/f_rebuild_csum_rootdir/image.gz create mode 100644 tests/f_rebuild_csum_rootdir/name diff --git a/e2fsck/pass3.c b/e2fsck/pass3.c index 6f7f855..efc0d49 100644 --- a/e2fsck/pass3.c +++ b/e2fsck/pass3.c @@ -188,28 +188,6 @@ static void check_root(e2fsck_t ctx) ext2fs_mark_bb_dirty(fs); /* - * Now let's create the actual data block for the inode - */ - pctx.errcode = ext2fs_new_dir_block(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, - &block); - if (pctx.errcode) { - pctx.str = "ext2fs_new_dir_block"; - fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx); - ctx->flags |= E2F_FLAG_ABORT; - return; - } - - pctx.errcode = ext2fs_write_dir_block4(fs, blk, block, 0, - EXT2_ROOT_INO); - if (pctx.errcode) { - pctx.str = "ext2fs_write_dir_block4"; - fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx); - ctx->flags |= E2F_FLAG_ABORT; - return; - } - ext2fs_free_mem(&block); - - /* * Set up the inode structure */ memset(&inode, 0, sizeof(inode)); @@ -232,6 +210,30 @@ static void check_root(e2fsck_t ctx) } /* + * Now let's create the actual data block for the inode. + * Due to metadata_csum, we must write the dir blocks AFTER + * the inode has been written to disk! + */ + pctx.errcode = ext2fs_new_dir_block(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, + &block); + if (pctx.errcode) { + pctx.str = "ext2fs_new_dir_block"; + fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx); + ctx->flags |= E2F_FLAG_ABORT; + return; + } + + pctx.errcode = ext2fs_write_dir_block4(fs, blk, block, 0, + EXT2_ROOT_INO); + ext2fs_free_mem(&block); + if (pctx.errcode) { + pctx.str = "ext2fs_write_dir_block4"; + fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx); + ctx->flags |= E2F_FLAG_ABORT; + return; + } + + /* * Miscellaneous bookkeeping... */ e2fsck_add_dir_info(ctx, EXT2_ROOT_INO, EXT2_ROOT_INO); @@ -449,24 +451,6 @@ unlink: ext2fs_inode_alloc_stats2(fs, ino, +1, 1); /* - * Now let's create the actual data block for the inode - */ - retval = ext2fs_new_dir_block(fs, ino, EXT2_ROOT_INO, &block); - if (retval) { - pctx.errcode = retval; - fix_problem(ctx, PR_3_ERR_LPF_NEW_DIR_BLOCK, &pctx); - return 0; - } - - retval = ext2fs_write_dir_block4(fs, blk, block, 0, ino); - ext2fs_free_mem(&block); - if (retval) { - pctx.errcode = retval; - fix_problem(ctx, PR_3_ERR_LPF_WRITE_BLOCK, &pctx); - return 0; - } - - /* * Set up the inode structure */ memset(&inode, 0, sizeof(inode)); @@ -486,6 +470,27 @@ unlink: fix_problem(ctx, PR_3_CREATE_LPF_ERROR, &pctx); return 0; } + + /* + * Now let's create the actual data block for the inode. + * Due to metadata_csum, the directory block MUST be written + * after the inode is written to disk! + */ + retval = ext2fs_new_dir_block(fs, ino, EXT2_ROOT_INO, &block); + if (retval) { + pctx.errcode = retval; + fix_problem(ctx, PR_3_ERR_LPF_NEW_DIR_BLOCK, &pctx); + return 0; + } + + retval = ext2fs_write_dir_block4(fs, blk, block, 0, ino); + ext2fs_free_mem(&block); + if (retval) { + pctx.errcode = retval; + fix_problem(ctx, PR_3_ERR_LPF_WRITE_BLOCK, &pctx); + return 0; + } + /* * Finally, create the directory link */ diff --git a/tests/f_rebuild_csum_rootdir/expect.1 b/tests/f_rebuild_csum_rootdir/expect.1 new file mode 100644 index 0000000..6b5c47b --- /dev/null +++ b/tests/f_rebuild_csum_rootdir/expect.1 @@ -0,0 +1,311 @@ +Pass 1: Checking inodes, blocks, and sizes +Pass 2: Checking directory structure +Directory inode 2, block #0, offset 0: directory has no checksum +Fix? yes + +Directory inode 2, block #0, offset 0: directory corrupted +Salvage? yes + +Missing '.' in directory inode 2. +Fix? yes + +Setting filetype for entry '.' in ??? (2) to 2. +Missing '..' in directory inode 2. +Fix? yes + +Setting filetype for entry '..' in ??? (2) to 2. +Pass 3: Checking directory connectivity +'..' in / (2) is <The NULL inode> (0), should be / (2). +Fix? yes + +Unconnected directory inode 11 (/???) +Connect to /lost+found? yes + +/lost+found not found. Create? yes + +Pass 3A: Optimizing directories +Pass 4: Checking reference counts +Inode 11 ref count is 3, should be 2. Fix? yes + +Unattached inode 12 +Connect to /lost+found? yes + +Inode 12 ref count is 2, should be 1. Fix? yes + +Unattached inode 13 +Connect to /lost+found? yes + +Inode 13 ref count is 2, should be 1. Fix? yes + +Unattached inode 14 +Connect to /lost+found? yes + +Inode 14 ref count is 2, should be 1. Fix? yes + +Unattached inode 15 +Connect to /lost+found? yes + +Inode 15 ref count is 2, should be 1. Fix? yes + +Unattached inode 16 +Connect to /lost+found? yes + +Inode 16 ref count is 2, should be 1. Fix? yes + +Unattached inode 17 +Connect to /lost+found? yes + +Inode 17 ref count is 2, should be 1. Fix? yes + +Unattached inode 18 +Connect to /lost+found? yes + +Inode 18 ref count is 2, should be 1. Fix? yes + +Unattached inode 19 +Connect to /lost+found? yes + +Inode 19 ref count is 2, should be 1. Fix? yes + +Unattached inode 20 +Connect to /lost+found? yes + +Inode 20 ref count is 2, should be 1. Fix? yes + +Unattached inode 21 +Connect to /lost+found? yes + +Inode 21 ref count is 2, should be 1. Fix? yes + +Unattached inode 22 +Connect to /lost+found? yes + +Inode 22 ref count is 2, should be 1. Fix? yes + +Unattached inode 23 +Connect to /lost+found? yes + +Inode 23 ref count is 2, should be 1. Fix? yes + +Unattached inode 24 +Connect to /lost+found? yes + +Inode 24 ref count is 2, should be 1. Fix? yes + +Unattached inode 25 +Connect to /lost+found? yes + +Inode 25 ref count is 2, should be 1. Fix? yes + +Unattached inode 26 +Connect to /lost+found? yes + +Inode 26 ref count is 2, should be 1. Fix? yes + +Unattached inode 27 +Connect to /lost+found? yes + +Inode 27 ref count is 2, should be 1. Fix? yes + +Unattached inode 28 +Connect to /lost+found? yes + +Inode 28 ref count is 2, should be 1. Fix? yes + +Unattached inode 29 +Connect to /lost+found? yes + +Inode 29 ref count is 2, should be 1. Fix? yes + +Unattached inode 30 +Connect to /lost+found? yes + +Inode 30 ref count is 2, should be 1. Fix? yes + +Unattached inode 31 +Connect to /lost+found? yes + +Inode 31 ref count is 2, should be 1. Fix? yes + +Unattached inode 32 +Connect to /lost+found? yes + +Inode 32 ref count is 2, should be 1. Fix? yes + +Unattached inode 33 +Connect to /lost+found? yes + +Inode 33 ref count is 2, should be 1. Fix? yes + +Unattached inode 34 +Connect to /lost+found? yes + +Inode 34 ref count is 2, should be 1. Fix? yes + +Unattached inode 35 +Connect to /lost+found? yes + +Inode 35 ref count is 2, should be 1. Fix? yes + +Unattached inode 36 +Connect to /lost+found? yes + +Inode 36 ref count is 2, should be 1. Fix? yes + +Unattached inode 37 +Connect to /lost+found? yes + +Inode 37 ref count is 2, should be 1. Fix? yes + +Unattached inode 38 +Connect to /lost+found? yes + +Inode 38 ref count is 2, should be 1. Fix? yes + +Unattached inode 39 +Connect to /lost+found? yes + +Inode 39 ref count is 2, should be 1. Fix? yes + +Unattached inode 40 +Connect to /lost+found? yes + +Inode 40 ref count is 2, should be 1. Fix? yes + +Unattached inode 41 +Connect to /lost+found? yes + +Inode 41 ref count is 2, should be 1. Fix? yes + +Unattached inode 42 +Connect to /lost+found? yes + +Inode 42 ref count is 2, should be 1. Fix? yes + +Unattached inode 43 +Connect to /lost+found? yes + +Inode 43 ref count is 2, should be 1. Fix? yes + +Unattached inode 44 +Connect to /lost+found? yes + +Inode 44 ref count is 2, should be 1. Fix? yes + +Unattached inode 45 +Connect to /lost+found? yes + +Inode 45 ref count is 2, should be 1. Fix? yes + +Unattached inode 46 +Connect to /lost+found? yes + +Inode 46 ref count is 2, should be 1. Fix? yes + +Unattached inode 47 +Connect to /lost+found? yes + +Inode 47 ref count is 2, should be 1. Fix? yes + +Unattached inode 48 +Connect to /lost+found? yes + +Inode 48 ref count is 2, should be 1. Fix? yes + +Unattached inode 49 +Connect to /lost+found? yes + +Inode 49 ref count is 2, should be 1. Fix? yes + +Unattached inode 50 +Connect to /lost+found? yes + +Inode 50 ref count is 2, should be 1. Fix? yes + +Unattached inode 51 +Connect to /lost+found? yes + +Inode 51 ref count is 2, should be 1. Fix? yes + +Unattached inode 52 +Connect to /lost+found? yes + +Inode 52 ref count is 2, should be 1. Fix? yes + +Unattached inode 53 +Connect to /lost+found? yes + +Inode 53 ref count is 2, should be 1. Fix? yes + +Unattached inode 54 +Connect to /lost+found? yes + +Inode 54 ref count is 2, should be 1. Fix? yes + +Unattached inode 55 +Connect to /lost+found? yes + +Inode 55 ref count is 2, should be 1. Fix? yes + +Unattached inode 56 +Connect to /lost+found? yes + +Inode 56 ref count is 2, should be 1. Fix? yes + +Unattached inode 57 +Connect to /lost+found? yes + +Inode 57 ref count is 2, should be 1. Fix? yes + +Unattached inode 58 +Connect to /lost+found? yes + +Inode 58 ref count is 2, should be 1. Fix? yes + +Unattached inode 59 +Connect to /lost+found? yes + +Inode 59 ref count is 2, should be 1. Fix? yes + +Unattached inode 60 +Connect to /lost+found? yes + +Inode 60 ref count is 2, should be 1. Fix? yes + +Unattached inode 61 +Connect to /lost+found? yes + +Inode 61 ref count is 2, should be 1. Fix? yes + +Unattached inode 62 +Connect to /lost+found? yes + +Inode 62 ref count is 2, should be 1. Fix? yes + +Unattached inode 63 +Connect to /lost+found? yes + +Inode 63 ref count is 2, should be 1. Fix? yes + +Unattached inode 64 +Connect to /lost+found? yes + +Inode 64 ref count is 2, should be 1. Fix? yes + +Unattached zero-length inode 65. Clear? yes + +Unattached inode 66 +Connect to /lost+found? yes + +Inode 66 ref count is 2, should be 1. Fix? yes + +Unattached inode 67 +Connect to /lost+found? yes + +Inode 67 ref count is 2, should be 1. Fix? yes + +Pass 5: Checking group summary information + +test_filesys: ***** FILE SYSTEM WAS MODIFIED ***** +test_filesys: 67/512 files (1.5% non-contiguous), 1127/2048 blocks +Exit status is 1 diff --git a/tests/f_rebuild_csum_rootdir/expect.2 b/tests/f_rebuild_csum_rootdir/expect.2 new file mode 100644 index 0000000..033f1bf --- /dev/null +++ b/tests/f_rebuild_csum_rootdir/expect.2 @@ -0,0 +1,7 @@ +Pass 1: Checking inodes, blocks, and sizes +Pass 2: Checking directory structure +Pass 3: Checking directory connectivity +Pass 4: Checking reference counts +Pass 5: Checking group summary information +test_filesys: 67/512 files (1.5% non-contiguous), 1127/2048 blocks +Exit status is 0 diff --git a/tests/f_rebuild_csum_rootdir/image.gz b/tests/f_rebuild_csum_rootdir/image.gz new file mode 100644 index 0000000000000000000000000000000000000000..a32fd4431a44560b20033d43836000ef22ce977f GIT binary patch literal 12476 zcmeI2c~leUyT@...MaFB>q3zwwrWuk5Ktr{q?HOkRKy~R2oeP}Dq@...Rc#;a6z#s zrpl69L{tz2#3&I4TtEa8ma;FSr9dEopd<uln0fBld(XM|o_o$czd!p&@...}yz|cc zeBS5%exEsK7#C;g9HESNemYIjJ@...!CU3;GrDISaQ)YkC7*op=Y<*7pKbba-qmkE z{p=r`FV7KVy-rRy3bf?&zWaXpYvZqH{p0*kI-Bftzdp6>+ba_$YR?N_+<)}zf`To5 z=hb$P-kkHF`HVWm`KluLK6~u-bcIqdR9ibDd9NH992~rn;rhk?^7~s8DqO8i9iH5G zbTwI3I@...+3X;vX#e`4%+zo0IIWB#)puBe<k4)1jR@...Elv_JmzO_wa#H8NfkT$ zv*p#67WPB&=KV$mH4)-VMq?elNFE}uYs-01N_4+AeAe?m#pQuxWM!6(s7&6qu=g8u zDwWuhHCTP6qz5~DIUa2>J>5bO@...d-aQQe^5?moSuer{AFys?L8)aG_kI{eJy^)P zyT8XU=k4shrP+9NwN81tFNv)(=H1H!mgoJP2cHO%ch#7zGPbpr$L9Nrqg?{@...rj z7=DQ5$~mJa>EDrpV>9Wm*tcinA`+HmmArRVmgyjicYCcr`AoB!{-=C;#g%1~!(FiP zSW-xA_nO{mbkOmx6f7yFD<_KjIAI2S3@...g0i>y-OR|18&;2&WoE5M#^Z<9AJmLF z^ehjUPY>zoJSv5)#RD3j(mLTd>GrTDx=P+^pOMRdcD%G#oX3w9sV^saD<@o<ZdEM! zL`UaGK;p1zPX_Hbvgpf4dzv-BA(7v~eLP`HM6rnc@ARU;tTnHvq2=RUB9X~~oXk`_ z{!&CbimW=RxoDF-RAmyYDsFHKIO?S24qdHieo;~V$so)@%!5aNnvr#zUzNc3?=wvf z^!(8Fa}e;J=dMXxAJCk9iAe>du06UR8_0+X*{@...d%)I-$zb$K3ucyba4~mO$m<H zpnuFgSu-d)xuf=Xo97?6Z~hQD&J9*kw}A@G?&(83_ED|ehg00U<Tpm~NmAqg+R4+; 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literal 0 HcmV?d00001 diff --git a/tests/f_rebuild_csum_rootdir/name b/tests/f_rebuild_csum_rootdir/name new file mode 100644 index 0000000..b246f48 --- /dev/null +++ b/tests/f_rebuild_csum_rootdir/name @@ -0,0 +1 @@ +force fsck to rebuild a corrupted rootdir w/ metadata_csum -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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