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Subject[PATCH v2 1/3] staging: erofs: introduce EFSCORRUPTED and more logs
Date
Previously, EROFS uses EIO to indicate that filesystem
is corrupted as well. However, as Pavel said [1], other
filesystems tend to use EUCLEAN(EFSCORRUPTED) instead,
let's follow what others do right now.

Also, add some more prints to the syslog.

[1] https://lore.kernel.org/lkml/20190813114821.GB11559@amd/

Suggested-by: Pavel Machek <pavel@denx.de>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
---
change log from v1:
- update the commit message;

This patchset has dependency on the previous patchset yesterday
https://lore.kernel.org/lkml/20190813023054.73126-1-gaoxiang25@huawei.com/

Thanks,
Gao Xiang

drivers/staging/erofs/data.c | 6 ++++--
drivers/staging/erofs/dir.c | 15 ++++++++-------
drivers/staging/erofs/inode.c | 17 ++++++++++++-----
drivers/staging/erofs/internal.h | 2 ++
drivers/staging/erofs/namei.c | 6 ++++--
drivers/staging/erofs/xattr.c | 5 +++--
drivers/staging/erofs/zmap.c | 5 +++--
7 files changed, 36 insertions(+), 20 deletions(-)

diff --git a/drivers/staging/erofs/data.c b/drivers/staging/erofs/data.c
index 4cdb743c8b8d..72c4b4c5296b 100644
--- a/drivers/staging/erofs/data.c
+++ b/drivers/staging/erofs/data.c
@@ -143,10 +143,12 @@ static int erofs_map_blocks_flatmode(struct inode *inode,
vi->xattr_isize + erofs_blkoff(map->m_la);
map->m_plen = inode->i_size - offset;

- /* inline data should locate in one meta block */
+ /* inline data should be located in one meta block */
if (erofs_blkoff(map->m_pa) + map->m_plen > PAGE_SIZE) {
+ errln("inline data cross block boundary @ nid %llu",
+ vi->nid);
DBG_BUGON(1);
- err = -EIO;
+ err = -EFSCORRUPTED;
goto err_out;
}

diff --git a/drivers/staging/erofs/dir.c b/drivers/staging/erofs/dir.c
index 2fbfc4935077..01efc96e1212 100644
--- a/drivers/staging/erofs/dir.c
+++ b/drivers/staging/erofs/dir.c
@@ -34,7 +34,7 @@ static void debug_one_dentry(unsigned char d_type, const char *de_name,
#endif
}

-static int erofs_fill_dentries(struct dir_context *ctx,
+static int erofs_fill_dentries(struct inode *dir, struct dir_context *ctx,
void *dentry_blk, unsigned int *ofs,
unsigned int nameoff, unsigned int maxsize)
{
@@ -63,8 +63,9 @@ static int erofs_fill_dentries(struct dir_context *ctx,
/* a corrupted entry is found */
if (unlikely(nameoff + de_namelen > maxsize ||
de_namelen > EROFS_NAME_LEN)) {
+ errln("bogus dirent @ nid %llu", EROFS_V(dir)->nid);
DBG_BUGON(1);
- return -EIO;
+ return -EFSCORRUPTED;
}

debug_one_dentry(d_type, de_name, de_namelen);
@@ -104,10 +105,9 @@ static int erofs_readdir(struct file *f, struct dir_context *ctx)

if (unlikely(nameoff < sizeof(struct erofs_dirent) ||
nameoff >= PAGE_SIZE)) {
- errln("%s, invalid de[0].nameoff %u",
- __func__, nameoff);
-
- err = -EIO;
+ errln("%s, invalid de[0].nameoff %u @ nid %llu",
+ __func__, nameoff, EROFS_V(dir)->nid);
+ err = -EFSCORRUPTED;
goto skip_this;
}

@@ -123,7 +123,8 @@ static int erofs_readdir(struct file *f, struct dir_context *ctx)
goto skip_this;
}

- err = erofs_fill_dentries(ctx, de, &ofs, nameoff, maxsize);
+ err = erofs_fill_dentries(dir, ctx, de, &ofs,
+ nameoff, maxsize);
skip_this:
kunmap(dentry_page);

diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
index 286729143365..461fd4213ce7 100644
--- a/drivers/staging/erofs/inode.c
+++ b/drivers/staging/erofs/inode.c
@@ -43,7 +43,7 @@ static int read_inode(struct inode *inode, void *data)
else if (S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode))
inode->i_rdev = 0;
else
- return -EIO;
+ goto bogusimode;

i_uid_write(inode, le32_to_cpu(v2->i_uid));
i_gid_write(inode, le32_to_cpu(v2->i_gid));
@@ -76,7 +76,7 @@ static int read_inode(struct inode *inode, void *data)
else if (S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode))
inode->i_rdev = 0;
else
- return -EIO;
+ goto bogusimode;

i_uid_write(inode, le16_to_cpu(v1->i_uid));
i_gid_write(inode, le16_to_cpu(v1->i_gid));
@@ -104,6 +104,11 @@ static int read_inode(struct inode *inode, void *data)
else
inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK;
return 0;
+
+bogusimode:
+ errln("bogus i_mode (%o) @ nid %llu", inode->i_mode, vi->nid);
+ DBG_BUGON(1);
+ return -EFSCORRUPTED;
}

/*
@@ -137,9 +142,11 @@ static int fill_inline_data(struct inode *inode, void *data,

/* inline symlink data shouldn't across page boundary as well */
if (unlikely(m_pofs + inode->i_size > PAGE_SIZE)) {
- DBG_BUGON(1);
kfree(lnk);
- return -EIO;
+ errln("inline data cross block boundary @ nid %llu",
+ vi->nid);
+ DBG_BUGON(1);
+ return -EFSCORRUPTED;
}

/* get in-page inline data */
@@ -200,7 +207,7 @@ static int fill_inode(struct inode *inode, int isdir)
init_special_inode(inode, inode->i_mode, inode->i_rdev);
goto out_unlock;
} else {
- err = -EIO;
+ err = -EFSCORRUPTED;
goto out_unlock;
}

diff --git a/drivers/staging/erofs/internal.h b/drivers/staging/erofs/internal.h
index 4ce5991c381f..12f737cbc0c0 100644
--- a/drivers/staging/erofs/internal.h
+++ b/drivers/staging/erofs/internal.h
@@ -548,5 +548,7 @@ static inline int z_erofs_init_zip_subsystem(void) { return 0; }
static inline void z_erofs_exit_zip_subsystem(void) {}
#endif /* !CONFIG_EROFS_FS_ZIP */

+#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
+
#endif /* __EROFS_INTERNAL_H */

diff --git a/drivers/staging/erofs/namei.c b/drivers/staging/erofs/namei.c
index 8e06526da023..c0963f5a2d22 100644
--- a/drivers/staging/erofs/namei.c
+++ b/drivers/staging/erofs/namei.c
@@ -116,10 +116,12 @@ static struct page *find_target_block_classic(struct inode *dir,
struct erofs_qstr dname;

if (unlikely(!ndirents)) {
- DBG_BUGON(1);
kunmap_atomic(de);
put_page(page);
- page = ERR_PTR(-EIO);
+ errln("corrupted dir block %d @ nid %llu",
+ mid, EROFS_V(dir)->nid);
+ DBG_BUGON(1);
+ page = ERR_PTR(-EFSCORRUPTED);
goto out;
}

diff --git a/drivers/staging/erofs/xattr.c b/drivers/staging/erofs/xattr.c
index 289c7850ec96..c5bfc9be412f 100644
--- a/drivers/staging/erofs/xattr.c
+++ b/drivers/staging/erofs/xattr.c
@@ -75,8 +75,9 @@ static int init_inode_xattrs(struct inode *inode)
goto out_unlock;
} else if (vi->xattr_isize < sizeof(struct erofs_xattr_ibody_header)) {
if (unlikely(vi->xattr_isize)) {
+ errln("bogus xattr ibody @ nid %llu", vi->nid);
DBG_BUGON(1);
- ret = -EIO;
+ ret = -EFSCORRUPTED;
goto out_unlock; /* xattr ondisk layout error */
}
ret = -ENOATTR;
@@ -237,7 +238,7 @@ static int xattr_foreach(struct xattr_iter *it,
/* xattr on-disk corruption: xattr entry beyond xattr_isize */
if (unlikely(*tlimit < entry_sz)) {
DBG_BUGON(1);
- return -EIO;
+ return -EFSCORRUPTED;
}
*tlimit -= entry_sz;
}
diff --git a/drivers/staging/erofs/zmap.c b/drivers/staging/erofs/zmap.c
index aeed5c674d9e..16b3625604f4 100644
--- a/drivers/staging/erofs/zmap.c
+++ b/drivers/staging/erofs/zmap.c
@@ -338,8 +338,9 @@ static int vle_extent_lookback(struct z_erofs_maprecorder *m,
int err;

if (lcn < lookback_distance) {
+ errln("bogus lookback distance @ nid %llu", vi->nid);
DBG_BUGON(1);
- return -EIO;
+ return -EFSCORRUPTED;
}

/* load extent head logical cluster if needed */
@@ -419,7 +420,7 @@ int z_erofs_map_blocks_iter(struct inode *inode,
if (unlikely(!m.lcn)) {
errln("invalid logical cluster 0 at nid %llu",
vi->nid);
- err = -EIO;
+ err = -EFSCORRUPTED;
goto unmap_out;
}
end = (m.lcn << lclusterbits) | m.clusterofs;
--
2.17.1
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