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Message-ID: <alpine.LFD.2.00.1405051911090.2223@localhost.localdomain> Date: Mon, 5 May 2014 19:13:55 +0200 (CEST) From: Lukáš Czerner <lczerner@...hat.com> To: "Darrick J. Wong" <darrick.wong@...cle.com> cc: tytso@....edu, linux-ext4@...r.kernel.org Subject: Re: [PATCH 13/37] e2fsck: write dir blocks after new inode when reconstructing root/lost+found On Thu, 1 May 2014, Darrick J. Wong wrote: > 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. Looks good, but might be worth noting in description that it also fixes possible memory leak in check_root() Reviewed-by: Lukas Czerner <lczerner@...hat.com> > > 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 > -- 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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