[PATCH 0/3] btrfs-progs: check: verify symlinks with append/immutable flags

[PATCH 0/3] btrfs-progs: check: verify symlinks with append/immutable flags

[Su Yue]

This patchset can be fetch from my github:
https://github.com/Damenly/btrfs-progs/commits/odd_inode_flags

symlinks should never have append/immutable attributes.
This patchset enables btrfs check to verify such corruption.

PATCH[1] is for original mode.
PATCH[2] is for original mode.

PATCH[3] adds a test image.
For further use, the directory is called odd-inode-flags.

#issue 133

Su Yue (3):
  btrfs-progs: check: check symlinks with append/immutable flags
  btrfs-progs: lowmem: check symlinks with append/immutable flags
  btrfs-progs: fsck-tests: add test case to check symlinks with odd
    flags

 check/main.c                                     |   7 +++++++
 check/mode-lowmem.c                              |  10 ++++++++++
 check/mode-original.h                            |   1 +
 .../034-odd-inode-flags/default_case.img         | Bin 0 -> 4096 bytes
 tests/fsck-tests/034-odd-inode-flags/test.sh     |  15 +++++++++++++++
 5 files changed, 33 insertions(+)
 create mode 100644 tests/fsck-tests/034-odd-inode-flags/default_case.img
 create mode 100755 tests/fsck-tests/034-odd-inode-flags/test.sh

-- 
2.17.0

[PATCH 1/3] btrfs-progs: check: check symlinks with append/immutable flags

[Su Yue]

Define new macro I_ERR_ODD_INODE_FLAGS to represents odd inode flags.

Symlinks should never have append/immutable flags.
While processing inodes, if found a symlink with append/immutable
flags, mark the inode record with I_ERR_ODD_INODE_FLAGS.

This is for original mode.

Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
---
 check/main.c          | 7 +++++++
 check/mode-original.h | 1 +
 2 files changed, 8 insertions(+)

diff --git a/check/main.c b/check/main.c
index 68da994f7ae0..f5f52c406046 100644
--- a/check/main.c
+++ b/check/main.c
@@ -576,6 +576,8 @@ static void print_inode_error(struct btrfs_root *root, struct inode_record *rec)
 		fprintf(stderr, ", link count wrong");
 	if (errors & I_ERR_FILE_EXTENT_ORPHAN)
 		fprintf(stderr, ", orphan file extent");
+	if (errors & I_ERR_ODD_INODE_FLAGS)
+		fprintf(stderr, ", odd inode flags");
 	fprintf(stderr, "\n");
 	/* Print the orphan extents if needed */
 	if (errors & I_ERR_FILE_EXTENT_ORPHAN)
@@ -805,6 +807,7 @@ static int process_inode_item(struct extent_buffer *eb,
 {
 	struct inode_record *rec;
 	struct btrfs_inode_item *item;
+	u64 flags;
 
 	rec = active_node->current;
 	BUG_ON(rec->ino != key->objectid || rec->refs > 1);
@@ -822,6 +825,10 @@ static int process_inode_item(struct extent_buffer *eb,
 	rec->found_inode_item = 1;
 	if (rec->nlink == 0)
 		rec->errors |= I_ERR_NO_ORPHAN_ITEM;
+	flags = btrfs_inode_flags(eb, item);
+	if (rec->imode & BTRFS_FT_SYMLINK &&
+	    flags & (BTRFS_INODE_IMMUTABLE | BTRFS_INODE_APPEND))
+		rec->errors = I_ERR_ODD_INODE_FLAGS;
 	maybe_free_inode_rec(&active_node->inode_cache, rec);
 	return 0;
 }
diff --git a/check/mode-original.h b/check/mode-original.h
index 368de692fdd1..13cfa5b9e1b3 100644
--- a/check/mode-original.h
+++ b/check/mode-original.h
@@ -186,6 +186,7 @@ struct file_extent_hole {
 #define I_ERR_LINK_COUNT_WRONG		(1 << 13)
 #define I_ERR_FILE_EXTENT_ORPHAN	(1 << 14)
 #define I_ERR_FILE_EXTENT_TOO_LARGE	(1 << 15)
+#define I_ERR_ODD_INODE_FLAGS		(1 << 16)
 
 struct inode_record {
 	struct list_head backrefs;
-- 
2.17.0

Re: [PATCH 1/3] btrfs-progs: check: check symlinks with append/immutable flags

[Nikolay Borisov]

On 14.05.2018 13:29, Su Yue wrote:
> Define new macro I_ERR_ODD_INODE_FLAGS to represents odd inode flags.
> 
> Symlinks should never have append/immutable flags.
> While processing inodes, if found a symlink with append/immutable
> flags, mark the inode record with I_ERR_ODD_INODE_FLAGS.
> 
> This is for original mode.
> 
> Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
> ---
>  check/main.c          | 7 +++++++
>  check/mode-original.h | 1 +
>  2 files changed, 8 insertions(+)
> 
> diff --git a/check/main.c b/check/main.c
> index 68da994f7ae0..f5f52c406046 100644
> --- a/check/main.c
> +++ b/check/main.c
> @@ -576,6 +576,8 @@ static void print_inode_error(struct btrfs_root *root, struct inode_record *rec)
>  		fprintf(stderr, ", link count wrong");
>  	if (errors & I_ERR_FILE_EXTENT_ORPHAN)
>  		fprintf(stderr, ", orphan file extent");
> +	if (errors & I_ERR_ODD_INODE_FLAGS)
> +		fprintf(stderr, ", odd inode flags");
>  	fprintf(stderr, "\n");
>  	/* Print the orphan extents if needed */
>  	if (errors & I_ERR_FILE_EXTENT_ORPHAN)
> @@ -805,6 +807,7 @@ static int process_inode_item(struct extent_buffer *eb,
>  {
>  	struct inode_record *rec;
>  	struct btrfs_inode_item *item;
> +	u64 flags;
>  
>  	rec = active_node->current;
>  	BUG_ON(rec->ino != key->objectid || rec->refs > 1);
> @@ -822,6 +825,10 @@ static int process_inode_item(struct extent_buffer *eb,
>  	rec->found_inode_item = 1;
>  	if (rec->nlink == 0)
>  		rec->errors |= I_ERR_NO_ORPHAN_ITEM;
> +	flags = btrfs_inode_flags(eb, item);
> +	if (rec->imode & BTRFS_FT_SYMLINK &&
> +	    flags & (BTRFS_INODE_IMMUTABLE | BTRFS_INODE_APPEND))
> +		rec->errors = I_ERR_ODD_INODE_FLAGS;
>  	maybe_free_inode_rec(&active_node->inode_cache, rec);
>  	return 0;
>  }
> diff --git a/check/mode-original.h b/check/mode-original.h
> index 368de692fdd1..13cfa5b9e1b3 100644
> --- a/check/mode-original.h
> +++ b/check/mode-original.h
> @@ -186,6 +186,7 @@ struct file_extent_hole {
>  #define I_ERR_LINK_COUNT_WRONG		(1 << 13)
>  #define I_ERR_FILE_EXTENT_ORPHAN	(1 << 14)
>  #define I_ERR_FILE_EXTENT_TOO_LARGE	(1 << 15)
> +#define I_ERR_ODD_INODE_FLAGS		(1 << 16)

I don't like the name of the flag. How about:

I_ERR_INVALID_SYMLINK_FLAGS

>  
>  struct inode_record {
>  	struct list_head backrefs;
> 

Re: [PATCH 1/3] btrfs-progs: check: check symlinks with append/immutable flags

[Su Yue]

[-- Attachment #1: Type: text/plain, Size: 2914 bytes --]

On 2018/5/14 7:18 PM, Nikolay Borisov wrote:
> 
> 
> On 14.05.2018 13:29, Su Yue wrote:
>> Define new macro I_ERR_ODD_INODE_FLAGS to represents odd inode flags.
>>
>> Symlinks should never have append/immutable flags.
>> While processing inodes, if found a symlink with append/immutable
>> flags, mark the inode record with I_ERR_ODD_INODE_FLAGS.
>>
>> This is for original mode.
>>
>> Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
>> ---
>>  check/main.c          | 7 +++++++
>>  check/mode-original.h | 1 +
>>  2 files changed, 8 insertions(+)
>>
>> diff --git a/check/main.c b/check/main.c
>> index 68da994f7ae0..f5f52c406046 100644
>> --- a/check/main.c
>> +++ b/check/main.c
>> @@ -576,6 +576,8 @@ static void print_inode_error(struct btrfs_root *root, struct inode_record *rec)
>>  		fprintf(stderr, ", link count wrong");
>>  	if (errors & I_ERR_FILE_EXTENT_ORPHAN)
>>  		fprintf(stderr, ", orphan file extent");
>> +	if (errors & I_ERR_ODD_INODE_FLAGS)
>> +		fprintf(stderr, ", odd inode flags");
>>  	fprintf(stderr, "\n");
>>  	/* Print the orphan extents if needed */
>>  	if (errors & I_ERR_FILE_EXTENT_ORPHAN)
>> @@ -805,6 +807,7 @@ static int process_inode_item(struct extent_buffer *eb,
>>  {
>>  	struct inode_record *rec;
>>  	struct btrfs_inode_item *item;
>> +	u64 flags;
>>  
>>  	rec = active_node->current;
>>  	BUG_ON(rec->ino != key->objectid || rec->refs > 1);
>> @@ -822,6 +825,10 @@ static int process_inode_item(struct extent_buffer *eb,
>>  	rec->found_inode_item = 1;
>>  	if (rec->nlink == 0)
>>  		rec->errors |= I_ERR_NO_ORPHAN_ITEM;
>> +	flags = btrfs_inode_flags(eb, item);
>> +	if (rec->imode & BTRFS_FT_SYMLINK &&
>> +	    flags & (BTRFS_INODE_IMMUTABLE | BTRFS_INODE_APPEND))
>> +		rec->errors = I_ERR_ODD_INODE_FLAGS;
>>  	maybe_free_inode_rec(&active_node->inode_cache, rec);
>>  	return 0;
>>  }
>> diff --git a/check/mode-original.h b/check/mode-original.h
>> index 368de692fdd1..13cfa5b9e1b3 100644
>> --- a/check/mode-original.h
>> +++ b/check/mode-original.h
>> @@ -186,6 +186,7 @@ struct file_extent_hole {
>>  #define I_ERR_LINK_COUNT_WRONG		(1 << 13)
>>  #define I_ERR_FILE_EXTENT_ORPHAN	(1 << 14)
>>  #define I_ERR_FILE_EXTENT_TOO_LARGE	(1 << 15)
>> +#define I_ERR_ODD_INODE_FLAGS		(1 << 16)
> 
> I don't like the name of the flag. How about:
> 
> I_ERR_INVALID_SYMLINK_FLAGS
> 
Before, original mode doesn't check inode flags.
So I'd rather to keep INODE_FLAGS for further use.

As for "ODD" part, it is just inherited from name style of above lines.
I don't like "ODD" too much either.
Anyway, thanks.

Su
>>  
>>  struct inode_record {
>>  	struct list_head backrefs;
>>
> --
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> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 


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Re: [PATCH 1/3] btrfs-progs: check: check symlinks with append/immutable flags

[Qu Wenruo]

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On 2018年05月14日 18:29, Su Yue wrote:
> Define new macro I_ERR_ODD_INODE_FLAGS to represents odd inode flags.
> 
> Symlinks should never have append/immutable flags.
> While processing inodes, if found a symlink with append/immutable
> flags, mark the inode record with I_ERR_ODD_INODE_FLAGS.
> 
> This is for original mode.
> 
> Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
> ---
>  check/main.c          | 7 +++++++
>  check/mode-original.h | 1 +
>  2 files changed, 8 insertions(+)
> 
> diff --git a/check/main.c b/check/main.c
> index 68da994f7ae0..f5f52c406046 100644
> --- a/check/main.c
> +++ b/check/main.c
> @@ -576,6 +576,8 @@ static void print_inode_error(struct btrfs_root *root, struct inode_record *rec)
>  		fprintf(stderr, ", link count wrong");
>  	if (errors & I_ERR_FILE_EXTENT_ORPHAN)
>  		fprintf(stderr, ", orphan file extent");
> +	if (errors & I_ERR_ODD_INODE_FLAGS)
> +		fprintf(stderr, ", odd inode flags");
>  	fprintf(stderr, "\n");
>  	/* Print the orphan extents if needed */
>  	if (errors & I_ERR_FILE_EXTENT_ORPHAN)
> @@ -805,6 +807,7 @@ static int process_inode_item(struct extent_buffer *eb,
>  {
>  	struct inode_record *rec;
>  	struct btrfs_inode_item *item;
> +	u64 flags;
>  
>  	rec = active_node->current;
>  	BUG_ON(rec->ino != key->objectid || rec->refs > 1);
> @@ -822,6 +825,10 @@ static int process_inode_item(struct extent_buffer *eb,
>  	rec->found_inode_item = 1;
>  	if (rec->nlink == 0)
>  		rec->errors |= I_ERR_NO_ORPHAN_ITEM;
> +	flags = btrfs_inode_flags(eb, item);
> +	if (rec->imode & BTRFS_FT_SYMLINK &&
> +	    flags & (BTRFS_INODE_IMMUTABLE | BTRFS_INODE_APPEND))
> +		rec->errors = I_ERR_ODD_INODE_FLAGS;

Shouldn't it be "|=" instead of "=" ?

Thanks,
Qu

>  	maybe_free_inode_rec(&active_node->inode_cache, rec);
>  	return 0;
>  }
> diff --git a/check/mode-original.h b/check/mode-original.h
> index 368de692fdd1..13cfa5b9e1b3 100644
> --- a/check/mode-original.h
> +++ b/check/mode-original.h
> @@ -186,6 +186,7 @@ struct file_extent_hole {
>  #define I_ERR_LINK_COUNT_WRONG		(1 << 13)
>  #define I_ERR_FILE_EXTENT_ORPHAN	(1 << 14)
>  #define I_ERR_FILE_EXTENT_TOO_LARGE	(1 << 15)
> +#define I_ERR_ODD_INODE_FLAGS		(1 << 16)
>  
>  struct inode_record {
>  	struct list_head backrefs;
> 


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Re: [PATCH 1/3] btrfs-progs: check: check symlinks with append/immutable flags

[Su Yue]

[-- Attachment #1: Type: text/plain, Size: 2491 bytes --]

On 2018/5/14 7:22 PM, Qu Wenruo wrote:
> 
> 
> On 2018年05月14日 18:29, Su Yue wrote:
>> Define new macro I_ERR_ODD_INODE_FLAGS to represents odd inode flags.
>>
>> Symlinks should never have append/immutable flags.
>> While processing inodes, if found a symlink with append/immutable
>> flags, mark the inode record with I_ERR_ODD_INODE_FLAGS.
>>
>> This is for original mode.
>>
>> Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
>> ---
>>  check/main.c          | 7 +++++++
>>  check/mode-original.h | 1 +
>>  2 files changed, 8 insertions(+)
>>
>> diff --git a/check/main.c b/check/main.c
>> index 68da994f7ae0..f5f52c406046 100644
>> --- a/check/main.c
>> +++ b/check/main.c
>> @@ -576,6 +576,8 @@ static void print_inode_error(struct btrfs_root *root, struct inode_record *rec)
>>  		fprintf(stderr, ", link count wrong");
>>  	if (errors & I_ERR_FILE_EXTENT_ORPHAN)
>>  		fprintf(stderr, ", orphan file extent");
>> +	if (errors & I_ERR_ODD_INODE_FLAGS)
>> +		fprintf(stderr, ", odd inode flags");
>>  	fprintf(stderr, "\n");
>>  	/* Print the orphan extents if needed */
>>  	if (errors & I_ERR_FILE_EXTENT_ORPHAN)
>> @@ -805,6 +807,7 @@ static int process_inode_item(struct extent_buffer *eb,
>>  {
>>  	struct inode_record *rec;
>>  	struct btrfs_inode_item *item;
>> +	u64 flags;
>>  
>>  	rec = active_node->current;
>>  	BUG_ON(rec->ino != key->objectid || rec->refs > 1);
>> @@ -822,6 +825,10 @@ static int process_inode_item(struct extent_buffer *eb,
>>  	rec->found_inode_item = 1;
>>  	if (rec->nlink == 0)
>>  		rec->errors |= I_ERR_NO_ORPHAN_ITEM;
>> +	flags = btrfs_inode_flags(eb, item);
>> +	if (rec->imode & BTRFS_FT_SYMLINK &&
>> +	    flags & (BTRFS_INODE_IMMUTABLE | BTRFS_INODE_APPEND))
>> +		rec->errors = I_ERR_ODD_INODE_FLAGS;
> 
> Shouldn't it be "|=" instead of "=" ?
> 
> Thanks,
> Qu

Oh... Should be "|=".

Thanks,
Su

> 
>>  	maybe_free_inode_rec(&active_node->inode_cache, rec);
>>  	return 0;
>>  }
>> diff --git a/check/mode-original.h b/check/mode-original.h
>> index 368de692fdd1..13cfa5b9e1b3 100644
>> --- a/check/mode-original.h
>> +++ b/check/mode-original.h
>> @@ -186,6 +186,7 @@ struct file_extent_hole {
>>  #define I_ERR_LINK_COUNT_WRONG		(1 << 13)
>>  #define I_ERR_FILE_EXTENT_ORPHAN	(1 << 14)
>>  #define I_ERR_FILE_EXTENT_TOO_LARGE	(1 << 15)
>> +#define I_ERR_ODD_INODE_FLAGS		(1 << 16)
>>  
>>  struct inode_record {
>>  	struct list_head backrefs;
>>
> 


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[PATCH 2/3] btrfs-progs: lowmem: check symlinks with append/immutable flags

[Su Yue]

Symlinks should never have append/immutable flags.
While checking inodes, if found a symlink with append/immutable
flags, report and record the fatal error.

This is for lowmem mode.

Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
---
 check/mode-lowmem.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/check/mode-lowmem.c b/check/mode-lowmem.c
index 9890180d1d3c..61c4e7f23d47 100644
--- a/check/mode-lowmem.c
+++ b/check/mode-lowmem.c
@@ -2274,6 +2274,7 @@ static int check_inode_item(struct btrfs_root *root, struct btrfs_path *path)
 	struct btrfs_key last_key;
 	u64 inode_id;
 	u32 mode;
+	u64 flags;
 	u64 nlink;
 	u64 nbytes;
 	u64 isize;
@@ -2307,10 +2308,19 @@ static int check_inode_item(struct btrfs_root *root, struct btrfs_path *path)
 	isize = btrfs_inode_size(node, ii);
 	nbytes = btrfs_inode_nbytes(node, ii);
 	mode = btrfs_inode_mode(node, ii);
+	flags = btrfs_inode_flags(node, ii);
 	dir = imode_to_type(mode) == BTRFS_FT_DIR;
 	nlink = btrfs_inode_nlink(node, ii);
 	nodatasum = btrfs_inode_flags(node, ii) & BTRFS_INODE_NODATASUM;
 
+	if (mode & BTRFS_FT_SYMLINK &&
+	    (flags & (BTRFS_INODE_IMMUTABLE | BTRFS_INODE_APPEND))) {
+		err = FATAL_ERROR;
+		error(
+"symlinks shall never be with immutable/append, root %llu inode item [%llu] flags %llu may be corrupted",
+		      root->objectid, inode_id, flags);
+	}
+
 	while (1) {
 		btrfs_item_key_to_cpu(path->nodes[0], &last_key, path->slots[0]);
 		ret = btrfs_next_item(root, path);
-- 
2.17.0

Re: [PATCH 2/3] btrfs-progs: lowmem: check symlinks with append/immutable flags

[Nikolay Borisov]

On 14.05.2018 13:29, Su Yue wrote:
> Symlinks should never have append/immutable flags.
> While checking inodes, if found a symlink with append/immutable
> flags, report and record the fatal error.
> 
> This is for lowmem mode.
> 
> Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
> ---
>  check/mode-lowmem.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/check/mode-lowmem.c b/check/mode-lowmem.c
> index 9890180d1d3c..61c4e7f23d47 100644
> --- a/check/mode-lowmem.c
> +++ b/check/mode-lowmem.c
> @@ -2274,6 +2274,7 @@ static int check_inode_item(struct btrfs_root *root, struct btrfs_path *path)
>  	struct btrfs_key last_key;
>  	u64 inode_id;
>  	u32 mode;
> +	u64 flags;
>  	u64 nlink;
>  	u64 nbytes;
>  	u64 isize;
> @@ -2307,10 +2308,19 @@ static int check_inode_item(struct btrfs_root *root, struct btrfs_path *path)
>  	isize = btrfs_inode_size(node, ii);
>  	nbytes = btrfs_inode_nbytes(node, ii);
>  	mode = btrfs_inode_mode(node, ii);
> +	flags = btrfs_inode_flags(node, ii);
>  	dir = imode_to_type(mode) == BTRFS_FT_DIR;
>  	nlink = btrfs_inode_nlink(node, ii);
>  	nodatasum = btrfs_inode_flags(node, ii) & BTRFS_INODE_NODATASUM;
>  
> +	if (mode & BTRFS_FT_SYMLINK &&
> +	    (flags & (BTRFS_INODE_IMMUTABLE | BTRFS_INODE_APPEND))) {
> +		err = FATAL_ERROR;
> +		error(
> +"symlinks shall never be with immutable/append, root %llu inode item [%llu] flags %llu may be corrupted",

How about: 

"symlinks must never have immutable/append flags set, root %llu ino %llu flag %llu may be corrupted". 

I think printing the ino number should suffice, no need for the "fancy" [] around the inode number. 
> +		      root->objectid, inode_id, flags);
> +	}
> +
>  	while (1) {
>  		btrfs_item_key_to_cpu(path->nodes[0], &last_key, path->slots[0]);
>  		ret = btrfs_next_item(root, path);
> 

Re: [PATCH 2/3] btrfs-progs: lowmem: check symlinks with append/immutable flags

[Su Yue]

Indeed better. Will do it in V2.

Thanks,
Su

On Mon, May 14, 2018 at 7:19 PM Nikolay Borisov <nborisov@suse.com> wrote:



> On 14.05.2018 13:29, Su Yue wrote:
> > Symlinks should never have append/immutable flags.
> > While checking inodes, if found a symlink with append/immutable
> > flags, report and record the fatal error.
> >
> > This is for lowmem mode.
> >
> > Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
> > ---
> >  check/mode-lowmem.c | 10 ++++++++++
> >  1 file changed, 10 insertions(+)
> >
> > diff --git a/check/mode-lowmem.c b/check/mode-lowmem.c
> > index 9890180d1d3c..61c4e7f23d47 100644
> > --- a/check/mode-lowmem.c
> > +++ b/check/mode-lowmem.c
> > @@ -2274,6 +2274,7 @@ static int check_inode_item(struct btrfs_root
*root, struct btrfs_path *path)
> >       struct btrfs_key last_key;
> >       u64 inode_id;
> >       u32 mode;
> > +     u64 flags;
> >       u64 nlink;
> >       u64 nbytes;
> >       u64 isize;
> > @@ -2307,10 +2308,19 @@ static int check_inode_item(struct btrfs_root
*root, struct btrfs_path *path)
> >       isize = btrfs_inode_size(node, ii);
> >       nbytes = btrfs_inode_nbytes(node, ii);
> >       mode = btrfs_inode_mode(node, ii);
> > +     flags = btrfs_inode_flags(node, ii);
> >       dir = imode_to_type(mode) == BTRFS_FT_DIR;
> >       nlink = btrfs_inode_nlink(node, ii);
> >       nodatasum = btrfs_inode_flags(node, ii) & BTRFS_INODE_NODATASUM;
> >
> > +     if (mode & BTRFS_FT_SYMLINK &&
> > +         (flags & (BTRFS_INODE_IMMUTABLE | BTRFS_INODE_APPEND))) {
> > +             err = FATAL_ERROR;
> > +             error(
> > +"symlinks shall never be with immutable/append, root %llu inode item
[%llu] flags %llu may be corrupted",

> How about:

> "symlinks must never have immutable/append flags set, root %llu ino %llu
flag %llu may be corrupted".

> I think printing the ino number should suffice, no need for the "fancy"
[] around the inode number.
> > +                   root->objectid, inode_id, flags);
> > +     }
> > +
> >       while (1) {
> >               btrfs_item_key_to_cpu(path->nodes[0], &last_key,
path->slots[0]);
> >               ret = btrfs_next_item(root, path);
> >
> --
> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [PATCH 2/3] btrfs-progs: lowmem: check symlinks with append/immutable flags

[Qu Wenruo]

[-- Attachment #1.1: Type: text/plain, Size: 1963 bytes --]



On 2018年05月14日 18:29, Su Yue wrote:
> Symlinks should never have append/immutable flags.
> While checking inodes, if found a symlink with append/immutable
> flags, report and record the fatal error.
> 
> This is for lowmem mode.
> 
> Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
> ---
>  check/mode-lowmem.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/check/mode-lowmem.c b/check/mode-lowmem.c
> index 9890180d1d3c..61c4e7f23d47 100644
> --- a/check/mode-lowmem.c
> +++ b/check/mode-lowmem.c
> @@ -2274,6 +2274,7 @@ static int check_inode_item(struct btrfs_root *root, struct btrfs_path *path)
>  	struct btrfs_key last_key;
>  	u64 inode_id;
>  	u32 mode;
> +	u64 flags;
>  	u64 nlink;
>  	u64 nbytes;
>  	u64 isize;
> @@ -2307,10 +2308,19 @@ static int check_inode_item(struct btrfs_root *root, struct btrfs_path *path)
>  	isize = btrfs_inode_size(node, ii);
>  	nbytes = btrfs_inode_nbytes(node, ii);
>  	mode = btrfs_inode_mode(node, ii);
> +	flags = btrfs_inode_flags(node, ii);
>  	dir = imode_to_type(mode) == BTRFS_FT_DIR;
>  	nlink = btrfs_inode_nlink(node, ii);
>  	nodatasum = btrfs_inode_flags(node, ii) & BTRFS_INODE_NODATASUM;
>  
> +	if (mode & BTRFS_FT_SYMLINK &&
> +	    (flags & (BTRFS_INODE_IMMUTABLE | BTRFS_INODE_APPEND))) {
> +		err = FATAL_ERROR;

Where is the FATAL_ERROR defined?
I can't find it anyway on v4.16 branch.

And I assume that FATAL_ERROR is defined to abort check, if so, in that
case the corruption is not that serious, just some unexpected behavior,
not a fatal error.

If not, just ignore this comment.

Thanks,
Qu

> +		error(
> +"symlinks shall never be with immutable/append, root %llu inode item [%llu] flags %llu may be corrupted",
> +		      root->objectid, inode_id, flags);
> +	}
> +
>  	while (1) {
>  		btrfs_item_key_to_cpu(path->nodes[0], &last_key, path->slots[0]);
>  		ret = btrfs_next_item(root, path);
> 


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

[PATCH 3/3] btrfs-progs: fsck-tests: add test case to check symlinks with odd flags

[Su Yue]

There are two bad symlinks in the test case.
One is with immutable attribute.
Another one is with append attribute.

Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
---
 .../034-odd-inode-flags/default_case.img         | Bin 0 -> 4096 bytes
 tests/fsck-tests/034-odd-inode-flags/test.sh     |  15 +++++++++++++++
 2 files changed, 15 insertions(+)
 create mode 100644 tests/fsck-tests/034-odd-inode-flags/default_case.img
 create mode 100755 tests/fsck-tests/034-odd-inode-flags/test.sh

diff --git a/tests/fsck-tests/034-odd-inode-flags/default_case.img b/tests/fsck-tests/034-odd-inode-flags/default_case.img
new file mode 100644
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diff --git a/tests/fsck-tests/034-odd-inode-flags/test.sh b/tests/fsck-tests/034-odd-inode-flags/test.sh
new file mode 100755
index 000000000000..2225efb44e0e
--- /dev/null
+++ b/tests/fsck-tests/034-odd-inode-flags/test.sh
@@ -0,0 +1,15 @@
+#!/bin/bash
+# In order to confirm that 'btrfs check' supports checking symlinks
+# with immutable/append attributes.
+#
+
+source "$TEST_TOP/common"
+
+check_prereq btrfs
+
+check_image() {
+	run_mustfail "check should report errors about inode flags" \
+        $SUDO_HELPER "$TOP/btrfs" check "$1"
+}
+
+check_all_images
-- 
2.17.0