Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> 于2023年9月22日周五 17:27写道：
>
> On Fri, Sep 22, 2023 at 10:54:58AM +0800, zhangshida wrote:
> > From: Shida Zhang <zhangshida@xxxxxxxxxx>
> >
> > [ Upstream commit 7fda67e8c3ab6069f75888f67958a6d30454a9f6 ]
> >
> > With the configuration PAGE_SIZE 64k and filesystem blocksize 64k,
> > a problem occurred when more than 13 million files were directly created
> > under a directory:
> >
> > EXT4-fs error (device xx): ext4_dx_csum_set:492: inode #xxxx: comm xxxxx: dir seems corrupt? Run e2fsck -D.
> > EXT4-fs error (device xx): ext4_dx_csum_verify:463: inode #xxxx: comm xxxxx: dir seems corrupt? Run e2fsck -D.
> > EXT4-fs error (device xx): dx_probe:856: inode #xxxx: block 8188: comm xxxxx: Directory index failed checksum
> >
> > When enough files are created, the fake_dirent->reclen will be 0xffff.
> > it doesn't equal to the blocksize 65536, i.e. 0x10000.
> >
> > But it is not the same condition when blocksize equals to 4k.
> > when enough files are created, the fake_dirent->reclen will be 0x1000.
> > it equals to the blocksize 4k, i.e. 0x1000.
> >
> > The problem seems to be related to the limitation of the 16-bit field
> > when the blocksize is set to 64k.
> > To address this, helpers like ext4_rec_len_{from,to}_disk has already
> > been introduced to complete the conversion between the encoded and the
> > plain form of rec_len.
> >
> > So fix this one by using the helper, and all the other in this file too.
> >
> > Cc: stable@xxxxxxxxxx
> > Fixes: dbe89444042a ("ext4: Calculate and verify checksums for htree nodes")
> > Suggested-by: Andreas Dilger <adilger@xxxxxxxxx>
> > Suggested-by: Darrick J. Wong <djwong@xxxxxxxxxx>
> > Signed-off-by: Shida Zhang <zhangshida@xxxxxxxxxx>
> > Reviewed-by: Andreas Dilger <adilger@xxxxxxxxx>
> > Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx>
> > Link: https://lore.kernel.org/r/20230803060938.1929759-1-zhangshida@xxxxxxxxxx
> > Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
> > Signed-off-by: Shida Zhang <zhangshida@xxxxxxxxxx>
> > ---
> > fs/ext4/namei.c | 26 +++++++++++++++-----------
> > 1 file changed, 15 insertions(+), 11 deletions(-)
> >
>
> What stable kernel tree(s) are you asking for this to be applied to?
>
> thanks,
>
> greg k-h
This one is intended for 4.14.y.
And the other one from zhangshida@xxxxxxxxxx is for 4.19.y.
Apologies for this confusion. It appears that the '--subject-prefix' option
of the 'git send-email' command does not work with the local patch file.
BTW, I forgot to CC my Gmail address in another thread,
so I reply here only.
Best regards,
Shida
