On Thu, 1 May 2014, Darrick J. Wong wrote:
> Date: Thu, 01 May 2014 16:13:47 -0700
> From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> To: tytso@xxxxxxx, darrick.wong@xxxxxxxxxx
> Cc: linux-ext4@xxxxxxxxxxxxxxx
> 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@xxxxxxxxxx>
>
> Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> ---
> 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
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> z;9EQ)0}e^392;EZJr9@0t>wW^-Bv`et{ri6h6@)rfvf4O5!hOxMqh-ETS{fzz4P%T
> z^cx-+oW7t&tT|9@K+fmSAVrBu-Ozh#4BpXM)X4N0qgJb!C-y3+fLYsNY3Mjx*Z|Mp
> z)FUUH6x0A6a_>{Xac7Wg&QSZ11!Aa3CzOmyTT*=lvctx)D-G=EjjH?}dmeP1N&*);
> zXRAzTaoYrsr@tBzdW=qD4NSr-P^FiDlIpGL_19nykM@8Sli<GD3qHnps>%6o#IIry
> zIVPb}ZE$|6jS3+ZZKUO*XRw~0ZMj^HvJ<FkqEexZVU*udj!x0uTpmM^;NV&?%qR*y
> z4o}tv5H8ZO14PwxB7h6b+_&TTy`kgS^#(MUBSX~VZDgl@EZIAeMv6EpESxJtN0Qq}
> z;mQe0Fh6u0vCKq^I#5|g8|l6%mQ=n>Bl&?UW!QchYx1%TgPkF`@LCZ_5-BsO9w`+v
> z#K`v*N_3K5vAFOt!ulMC@b55<F#aoF#IEaZC(JH`-Y`1rLn_F@scbVBx^Q-nQZPvu
> ziByK(DVeh8p!Cfa!~#~$B$RaFsE39K#3w+*W`~di*V0JVYZ<Gc1bV#|`)e%CCUAC`
> zgo?4og;SelDE_F8447>J?)2t!ouRu~$;z3s=D|&R1I(EO@=F8y!s|Yn<F65Vgg`>5
> zgdz%iAk0aIh96Z>O|u*+X>~hYn#kUWNu;*4fVi4C0M(z7uTW(~gfskMd4@{Lz1Ypl
> zdP_0F!Y*GSY;ZKzM~10nZRFKi7SP|PK$c`8IrO1>alJ}0T}S836)oFuJX`Cnl$U)t
> zyqN503pOF@+$v4zoqCp^0SSW07yQs9SKFyK$LP@8Y2_4*g9uO(hJgzR0iA$-3`y<D
> zVGt@eC;)meKzz@Tkko0eVv)XV;<crT)$bn%VZV^_Qa~M*Q8%4Y+XJapdBE^-r|125
> zK9TwVr>Sd%c++YZwqf_$JGLt7j-!FEgHf8%6$%?|^{_r%I+k)Dc`wPG`aU^vi-~>c
> zFt+`dh4EvDa`zTmRUyZ&I?quMT{e1i6_lC8ppCRKNkR-4#UFXdi)Ph;NARRqR|S{3
> zFS=&%9_LIScI_26&Zt91x&m3fy|e~ymrUhj`zNs-gqxkw^|?zM4~WAfE#h|AEgOhn
> zhaQlzA04cve#tnwe?JE6ee}ULH~oinlDGl#Xb!CJhdHgtXU*|^|9rvoDddff)c`CU
> zB%yNciCXjlr1b0oGqs2kt#KW%WqvA&i+p{7I$746Ru4G=!pH-JcbwA`D&&b3Ay~UW
> z&PXkSXNi<>t{z>00UGy-9R<`0CLxu|*x@H+$nB*(<Z0O+BtSyVw#L^_2FQfA8+cG+
> zPRjvhOGX?4`gG|ZQdxR0z`Yz6i=qEi4O$vD&c4=wyz_Db+9@=QLe~OnCX=v~$WYW#
> zg++%bs61N6<7mZtBSY}AdPwN>*9d6YIZuzOmSLp}aKjRR4dlM<g)%0g&rvB)9F`$(
> zRk9=`b&(viq$ybAT;E0b^k984^8U~(Ttf>xt+9>4PH+p(b)!BN1l*<%Uabs``d&Q=
> zFA9jx^_DHjx3t9^RI%(=s*s6$ZKRae8+S=N;_VE&Rc9%C9&G@-=}W8V6fzo+uEu)S
> z*dtjDoJvA=(kl6L0~FUdK}o8=hEcY;fV#&d1c55Xd(99owJ0DG7R6F5a}J~!kU=L+
> za7K>}4}R7af-&6=cN&nErAD~@Z}||H`}TwK*EG`Wpb8!v;hgk^Vo;R$lTBgcmUS|4
> zRjY+wyDLYad(^)Z`Cm5C$!a~eD;KV$ku}!1va7U&5^v;zL|25=*0v+`DYl)x37$5H
> zz+qPisi{vRTLV@3Pgbae;T{SKUEmA$t2yu?k-D?)7EA=uN?~<(517)qrZ%unB-A4{
> z6Ky2R!VVZ2MNpDRMeTHg^G$TFv=%acE&@D}(%&6VT{NT()++=@R&juDgR@anl@iZv
> zBlSkQ5O^&b%y%bP=|vEqNHzA}LexD4#K5B1DHc8Yk^w0?{sk^_Siys9r=)OM(vE(e
> ziA1VNhGo*lZbVb>Pgc<_#mXR(8zJLHFXKU!ZZ;Iqz9EreYDqn)ivl$0o>2;;rTKbp
> zE1WdOO_hdX)O2MF%ZvjL3`hrQ0(DkXHNwh$JN5C=q|+J~4gZtO?=cZ0#3?zeYCwTH
> zWWt>oCx{Td9D!{W!)&^Z0Y7JiQ;ak?6cEDIPbkD+LfKp68s-|6FxEw-frV+5DQ!$P
> zneb-J3C0GhMi@Vgl3XFJ#$GMG*!)}IuCE$~1@R%|yO2yrO23O5dzwa?+2F9Nn~Lf?
> z*G9gW)dMWLpCJs$R!;#kpwJh?`BR;L6(HXka=g6Q5Ok><iK|cx>1u-|necLmV4#ij
> z#E5r=8v4^nO`wW3d9fZ*A1NTJ7Wq=bn?=x*NQrZlNZwy&pn8w^{xpas7eRuz5^4V*
> zD!SGgR_bD~gRXXV%Q$Md39@zuxWoTr3>wYe^agZd_AOW{_t&`7zM1rt>GGO1AlYT+
> zDsFVRf^wy+ySAnszIBG(%^J}2F)3pFJA$koqa~mvpe3Lspe3Lspe3Lspe3Lspe3Ls
> zpe3Lspe3Lspe3Lspe3Lspe3Lspe3Lspe3Lspe67(B|wQB?3U1P9P7+eL4^IM3;(9e
> W)Gq69OyI|Sozg9bf2Chr*ZB{=uW}{;
>
> 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
>
> --
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