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Message-ID: <20190820071645.GH159846@architecture4>
Date: Tue, 20 Aug 2019 15:16:45 +0800
From: Gao Xiang <gaoxiang25@...wei.com>
To: "Li, Philip" <philip.li@...el.com>
CC: Gao Xiang <hsiangkao@....com>, lkp <lkp@...el.com>,
"kbuild-all@...org" <kbuild-all@...org>,
"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
"linux-erofs@...ts.ozlabs.org" <linux-erofs@...ts.ozlabs.org>,
LKML <linux-kernel@...r.kernel.org>,
"stable@...r.kernel.org" <stable@...r.kernel.org>,
Fang Wei <fangwei1@...wei.com>, Miao Xie <miaoxie@...wei.com>
Subject: Re: [PATCH] staging: erofs: fix an error handling in erofs_readdir()
On Tue, Aug 20, 2019 at 06:58:00AM +0000, Li, Philip wrote:
> > Subject: Re: [PATCH] staging: erofs: fix an error handling in erofs_readdir()
> >
> > Hi Philip,
> >
> > On Tue, Aug 20, 2019 at 02:50:38PM +0800, Philip Li wrote:
> > > On Sun, Aug 18, 2019 at 09:25:04PM +0800, Gao Xiang wrote:
> > > > On Sun, Aug 18, 2019 at 09:17:52PM +0800, kbuild test robot wrote:
> > > > > Hi Gao,
> > > > >
> > > > > I love your patch! Yet something to improve:
> > > > >
> > > > > [auto build test ERROR on linus/master]
> > > > > [cannot apply to v5.3-rc4 next-20190816]
> > > > > [if your patch is applied to the wrong git tree, please drop us a note to help
> > improve the system]
> > > >
> > > > ... those patches should be applied to staging tree
> > > > since linux-next has not been updated yet...
> > > thanks for the feedback, we will consider this to our todo list.
> >
> > Yes, many confusing reports anyway...
> > (Just my personal suggestion, maybe we can add some hints on the patch email
> > to indicate which tree can be applied successfully for ci in the future...)
> thanks, this is good idea. On the other side, we support to add --base option to git format-patch
> to automatically suggest the base, refer to https://stackoverflow.com/a/37406982 for detail.
Thanks for your information :) It seems a new patch format,
I will take a try later.
Thanks,
Gao Xiang
> Meanwhile, we will enhance the internal logic to find suitable base if possible.
>
> >
> > Thanks,
> > Gao Xiang
> >
> > >
> > > >
> > > > Thanks,
> > > > Gao Xiang
> > > >
> > > > >
> > > > > url: https://github.com/0day-ci/linux/commits/Gao-Xiang/staging-erofs-fix-
> > an-error-handling-in-erofs_readdir/20190818-191344
> > > > > config: arm64-allyesconfig (attached as .config)
> > > > > compiler: aarch64-linux-gcc (GCC) 7.4.0
> > > > > reproduce:
> > > > > wget https://raw.githubusercontent.com/intel/lkp-
> > tests/master/sbin/make.cross -O ~/bin/make.cross
> > > > > chmod +x ~/bin/make.cross
> > > > > # save the attached .config to linux build tree
> > > > > GCC_VERSION=7.4.0 make.cross ARCH=arm64
> > > > >
> > > > > If you fix the issue, kindly add following tag
> > > > > Reported-by: kbuild test robot <lkp@...el.com>
> > > > >
> > > > > All errors (new ones prefixed by >>):
> > > > >
> > > > > drivers/staging/erofs/dir.c: In function 'erofs_readdir':
> > > > > >> drivers/staging/erofs/dir.c:110:11: error: 'EFSCORRUPTED' undeclared
> > (first use in this function); did you mean 'FS_NRSUPER'?
> > > > > err = -EFSCORRUPTED;
> > > > > ^~~~~~~~~~~~
> > > > > FS_NRSUPER
> > > > > drivers/staging/erofs/dir.c:110:11: note: each undeclared identifier is
> > reported only once for each function it appears in
> > > > >
> > > > > vim +110 drivers/staging/erofs/dir.c
> > > > >
> > > > > 85
> > > > > 86 static int erofs_readdir(struct file *f, struct dir_context *ctx)
> > > > > 87 {
> > > > > 88 struct inode *dir = file_inode(f);
> > > > > 89 struct address_space *mapping = dir->i_mapping;
> > > > > 90 const size_t dirsize = i_size_read(dir);
> > > > > 91 unsigned int i = ctx->pos / EROFS_BLKSIZ;
> > > > > 92 unsigned int ofs = ctx->pos % EROFS_BLKSIZ;
> > > > > 93 int err = 0;
> > > > > 94 bool initial = true;
> > > > > 95
> > > > > 96 while (ctx->pos < dirsize) {
> > > > > 97 struct page *dentry_page;
> > > > > 98 struct erofs_dirent *de;
> > > > > 99 unsigned int nameoff, maxsize;
> > > > > 100
> > > > > 101 dentry_page = read_mapping_page(mapping, i,
> > NULL);
> > > > > 102 if (dentry_page == ERR_PTR(-ENOMEM)) {
> > > > > 103 errln("no memory to readdir of logical
> > block %u of nid %llu",
> > > > > 104 i, EROFS_V(dir)->nid);
> > > > > 105 err = -ENOMEM;
> > > > > 106 break;
> > > > > 107 } else if (IS_ERR(dentry_page)) {
> > > > > 108 errln("fail to readdir of logical block %u of
> > nid %llu",
> > > > > 109 i, EROFS_V(dir)->nid);
> > > > > > 110 err = -EFSCORRUPTED;
> > > > > 111 break;
> > > > > 112 }
> > > > > 113
> > > > > 114 de = (struct erofs_dirent *)kmap(dentry_page);
> > > > > 115
> > > > > 116 nameoff = le16_to_cpu(de->nameoff);
> > > > > 117
> > > > > 118 if (unlikely(nameoff < sizeof(struct erofs_dirent) ||
> > > > > 119 nameoff >= PAGE_SIZE)) {
> > > > > 120 errln("%s, invalid de[0].nameoff %u",
> > > > > 121 __func__, nameoff);
> > > > > 122
> > > > > 123 err = -EIO;
> > > > > 124 goto skip_this;
> > > > > 125 }
> > > > > 126
> > > > > 127 maxsize = min_t(unsigned int,
> > > > > 128 dirsize - ctx->pos + ofs,
> > PAGE_SIZE);
> > > > > 129
> > > > > 130 /* search dirents at the arbitrary position */
> > > > > 131 if (unlikely(initial)) {
> > > > > 132 initial = false;
> > > > > 133
> > > > > 134 ofs = roundup(ofs, sizeof(struct
> > erofs_dirent));
> > > > > 135 if (unlikely(ofs >= nameoff))
> > > > > 136 goto skip_this;
> > > > > 137 }
> > > > > 138
> > > > > 139 err = erofs_fill_dentries(ctx, de, &ofs, nameoff,
> > maxsize);
> > > > > 140 skip_this:
> > > > > 141 kunmap(dentry_page);
> > > > > 142
> > > > > 143 put_page(dentry_page);
> > > > > 144
> > > > > 145 ctx->pos = blknr_to_addr(i) + ofs;
> > > > > 146
> > > > > 147 if (unlikely(err))
> > > > > 148 break;
> > > > > 149 ++i;
> > > > > 150 ofs = 0;
> > > > > 151 }
> > > > > 152 return err < 0 ? err : 0;
> > > > > 153 }
> > > > > 154
> > > > >
> > > > > ---
> > > > > 0-DAY kernel test infrastructure Open Source Technology Center
> > > > > https://lists.01.org/pipermail/kbuild-all Intel Corporation
> > > >
> > > >
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