[PATCH 1/2] staging: erofs: support statx

[PATCH 1/2] staging: erofs: support statx

[Gao Xiang]

statx() has already been supported in commit a528d35e8bfc
("statx: Add a system call to make enhanced file info available"),
user programs can get more useful attributes.

Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
---
 drivers/staging/erofs/inode.c    | 18 ++++++++++++++++++
 drivers/staging/erofs/internal.h |  2 ++
 drivers/staging/erofs/namei.c    |  1 +
 3 files changed, 21 insertions(+)

diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
index c7d3b815a798..8da144943ed6 100644
--- a/drivers/staging/erofs/inode.c
+++ b/drivers/staging/erofs/inode.c
@@ -285,7 +285,23 @@ struct inode *erofs_iget(struct super_block *sb,
 	return inode;
 }
 
+int erofs_getattr(const struct path *path, struct kstat *stat,
+		  u32 request_mask, unsigned int query_flags)
+{
+	struct inode *const inode = d_inode(path->dentry);
+	struct erofs_vnode *const vi = EROFS_V(inode);
+
+	if (vi->data_mapping_mode == EROFS_INODE_LAYOUT_COMPRESSION)
+		stat->attributes |= STATX_ATTR_COMPRESSED;
+
+	stat->attributes |= STATX_ATTR_IMMUTABLE;
+
+	generic_fillattr(inode, stat);
+	return 0;
+}
+
 const struct inode_operations erofs_generic_iops = {
+	.getattr = erofs_getattr,
 #ifdef CONFIG_EROFS_FS_XATTR
 	.listxattr = erofs_listxattr,
 #endif
@@ -294,6 +310,7 @@ const struct inode_operations erofs_generic_iops = {
 
 const struct inode_operations erofs_symlink_iops = {
 	.get_link = page_get_link,
+	.getattr = erofs_getattr,
 #ifdef CONFIG_EROFS_FS_XATTR
 	.listxattr = erofs_listxattr,
 #endif
@@ -302,6 +319,7 @@ const struct inode_operations erofs_symlink_iops = {
 
 const struct inode_operations erofs_fast_symlink_iops = {
 	.get_link = simple_get_link,
+	.getattr = erofs_getattr,
 #ifdef CONFIG_EROFS_FS_XATTR
 	.listxattr = erofs_listxattr,
 #endif
diff --git a/drivers/staging/erofs/internal.h b/drivers/staging/erofs/internal.h
index c47778b3fabd..911333cdeef4 100644
--- a/drivers/staging/erofs/internal.h
+++ b/drivers/staging/erofs/internal.h
@@ -556,6 +556,8 @@ static inline bool is_inode_fast_symlink(struct inode *inode)
 }
 
 struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid, bool dir);
+int erofs_getattr(const struct path *path, struct kstat *stat,
+		  u32 request_mask, unsigned int query_flags);
 
 /* namei.c */
 extern const struct inode_operations erofs_dir_iops;
diff --git a/drivers/staging/erofs/namei.c b/drivers/staging/erofs/namei.c
index d8d9dc9dab43..fd3ae78d0ba5 100644
--- a/drivers/staging/erofs/namei.c
+++ b/drivers/staging/erofs/namei.c
@@ -247,6 +247,7 @@ static struct dentry *erofs_lookup(struct inode *dir,
 
 const struct inode_operations erofs_dir_iops = {
 	.lookup = erofs_lookup,
+	.getattr = erofs_getattr,
 #ifdef CONFIG_EROFS_FS_XATTR
 	.listxattr = erofs_listxattr,
 #endif
-- 
2.17.1

[PATCH 2/2] staging: erofs: fix i_blocks calculation

[Gao Xiang]

For compressed files, i_blocks should not be calculated
by using i_size. i_u.compressed_blocks is used instead.

In addition, i_blocks is miscalculated for non-compressed
files previously, fix it as well.

Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
---
 drivers/staging/erofs/inode.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
index 8da144943ed6..b1b790767089 100644
--- a/drivers/staging/erofs/inode.c
+++ b/drivers/staging/erofs/inode.c
@@ -20,6 +20,7 @@ static int read_inode(struct inode *inode, void *data)
 	struct erofs_vnode *vi = EROFS_V(inode);
 	struct erofs_inode_v1 *v1 = data;
 	const unsigned int advise = le16_to_cpu(v1->i_advise);
+	erofs_blk_t nblks = 0;
 
 	vi->data_mapping_mode = __inode_data_mapping(advise);
 
@@ -60,6 +61,10 @@ static int read_inode(struct inode *inode, void *data)
 			le32_to_cpu(v2->i_ctime_nsec);
 
 		inode->i_size = le64_to_cpu(v2->i_size);
+
+		/* total blocks for compressed files */
+		if (vi->data_mapping_mode == EROFS_INODE_LAYOUT_COMPRESSION)
+			nblks = v2->i_u.compressed_blocks;
 	} else if (__inode_version(advise) == EROFS_INODE_LAYOUT_V1) {
 		struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
 
@@ -90,6 +95,8 @@ static int read_inode(struct inode *inode, void *data)
 			sbi->build_time_nsec;
 
 		inode->i_size = le32_to_cpu(v1->i_size);
+		if (vi->data_mapping_mode == EROFS_INODE_LAYOUT_COMPRESSION)
+			nblks = v1->i_u.compressed_blocks;
 	} else {
 		errln("unsupported on-disk inode version %u of nid %llu",
 		      __inode_version(advise), vi->nid);
@@ -97,8 +104,11 @@ static int read_inode(struct inode *inode, void *data)
 		return -EIO;
 	}
 
-	/* measure inode.i_blocks as the generic filesystem */
-	inode->i_blocks = ((inode->i_size - 1) >> 9) + 1;
+	if (!nblks)
+		/* measure inode.i_blocks as generic filesystems */
+		inode->i_blocks = roundup(inode->i_size, EROFS_BLKSIZ) >> 9;
+	else
+		inode->i_blocks = nblks >> LOG_SECTORS_PER_BLOCK;
 	return 0;
 }
 
-- 
2.17.1

[PATCH v2 2/2] staging: erofs: fix i_blocks calculation

[Gao Xiang]

For compressed files, i_blocks should not be calculated
by using i_size. i_u.compressed_blocks is used instead.

In addition, i_blocks was miscalculated for non-compressed
files previously, fix it as well.

Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
---
change log v2:
 - fix description in commit message
 - fix to 'inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK'

Thanks,
Gao Xiang

 drivers/staging/erofs/inode.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
index 8da144943ed6..6e67e018784e 100644
--- a/drivers/staging/erofs/inode.c
+++ b/drivers/staging/erofs/inode.c
@@ -20,6 +20,7 @@ static int read_inode(struct inode *inode, void *data)
 	struct erofs_vnode *vi = EROFS_V(inode);
 	struct erofs_inode_v1 *v1 = data;
 	const unsigned int advise = le16_to_cpu(v1->i_advise);
+	erofs_blk_t nblks = 0;
 
 	vi->data_mapping_mode = __inode_data_mapping(advise);
 
@@ -60,6 +61,10 @@ static int read_inode(struct inode *inode, void *data)
 			le32_to_cpu(v2->i_ctime_nsec);
 
 		inode->i_size = le64_to_cpu(v2->i_size);
+
+		/* total blocks for compressed files */
+		if (vi->data_mapping_mode == EROFS_INODE_LAYOUT_COMPRESSION)
+			nblks = v2->i_u.compressed_blocks;
 	} else if (__inode_version(advise) == EROFS_INODE_LAYOUT_V1) {
 		struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
 
@@ -90,6 +95,8 @@ static int read_inode(struct inode *inode, void *data)
 			sbi->build_time_nsec;
 
 		inode->i_size = le32_to_cpu(v1->i_size);
+		if (vi->data_mapping_mode == EROFS_INODE_LAYOUT_COMPRESSION)
+			nblks = v1->i_u.compressed_blocks;
 	} else {
 		errln("unsupported on-disk inode version %u of nid %llu",
 		      __inode_version(advise), vi->nid);
@@ -97,8 +104,11 @@ static int read_inode(struct inode *inode, void *data)
 		return -EIO;
 	}
 
-	/* measure inode.i_blocks as the generic filesystem */
-	inode->i_blocks = ((inode->i_size - 1) >> 9) + 1;
+	if (!nblks)
+		/* measure inode.i_blocks as generic filesystems */
+		inode->i_blocks = roundup(inode->i_size, EROFS_BLKSIZ) >> 9;
+	else
+		inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK;
 	return 0;
 }
 
-- 
2.17.1

Re: [PATCH v2 2/2] staging: erofs: fix i_blocks calculation

[Chao Yu]

On 2019/5/28 10:36, Gao Xiang wrote:
> For compressed files, i_blocks should not be calculated
> by using i_size. i_u.compressed_blocks is used instead.
> 
> In addition, i_blocks was miscalculated for non-compressed
> files previously, fix it as well.
> 
> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
> ---
> change log v2:
>  - fix description in commit message
>  - fix to 'inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK'
> 
> Thanks,
> Gao Xiang
> 
>  drivers/staging/erofs/inode.c | 14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
> index 8da144943ed6..6e67e018784e 100644
> --- a/drivers/staging/erofs/inode.c
> +++ b/drivers/staging/erofs/inode.c
> @@ -20,6 +20,7 @@ static int read_inode(struct inode *inode, void *data)
>  	struct erofs_vnode *vi = EROFS_V(inode);
>  	struct erofs_inode_v1 *v1 = data;
>  	const unsigned int advise = le16_to_cpu(v1->i_advise);
> +	erofs_blk_t nblks = 0;
>  
>  	vi->data_mapping_mode = __inode_data_mapping(advise);
>  
> @@ -60,6 +61,10 @@ static int read_inode(struct inode *inode, void *data)
>  			le32_to_cpu(v2->i_ctime_nsec);
>  
>  		inode->i_size = le64_to_cpu(v2->i_size);
> +
> +		/* total blocks for compressed files */
> +		if (vi->data_mapping_mode == EROFS_INODE_LAYOUT_COMPRESSION)
> +			nblks = v2->i_u.compressed_blocks;

Xiang,

It needs to use le32_to_cpu(). ;)

>  	} else if (__inode_version(advise) == EROFS_INODE_LAYOUT_V1) {
>  		struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
>  
> @@ -90,6 +95,8 @@ static int read_inode(struct inode *inode, void *data)
>  			sbi->build_time_nsec;
>  
>  		inode->i_size = le32_to_cpu(v1->i_size);
> +		if (vi->data_mapping_mode == EROFS_INODE_LAYOUT_COMPRESSION)
> +			nblks = v1->i_u.compressed_blocks;

Ditto.

Thanks,

>  	} else {
>  		errln("unsupported on-disk inode version %u of nid %llu",
>  		      __inode_version(advise), vi->nid);
> @@ -97,8 +104,11 @@ static int read_inode(struct inode *inode, void *data)
>  		return -EIO;
>  	}
>  
> -	/* measure inode.i_blocks as the generic filesystem */
> -	inode->i_blocks = ((inode->i_size - 1) >> 9) + 1;
> +	if (!nblks)
> +		/* measure inode.i_blocks as generic filesystems */
> +		inode->i_blocks = roundup(inode->i_size, EROFS_BLKSIZ) >> 9;
> +	else
> +		inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK;
>  	return 0;
>  }
>  
> 

Re: [PATCH v2 2/2] staging: erofs: fix i_blocks calculation

[Gao Xiang]

On 2019/5/28 11:02, Chao Yu wrote:
> On 2019/5/28 10:36, Gao Xiang wrote:
>> For compressed files, i_blocks should not be calculated
>> by using i_size. i_u.compressed_blocks is used instead.
>>
>> In addition, i_blocks was miscalculated for non-compressed
>> files previously, fix it as well.
>>
>> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
>> ---
>> change log v2:
>>  - fix description in commit message
>>  - fix to 'inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK'
>>
>> Thanks,
>> Gao Xiang
>>
>>  drivers/staging/erofs/inode.c | 14 ++++++++++++--
>>  1 file changed, 12 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
>> index 8da144943ed6..6e67e018784e 100644
>> --- a/drivers/staging/erofs/inode.c
>> +++ b/drivers/staging/erofs/inode.c
>> @@ -20,6 +20,7 @@ static int read_inode(struct inode *inode, void *data)
>>  	struct erofs_vnode *vi = EROFS_V(inode);
>>  	struct erofs_inode_v1 *v1 = data;
>>  	const unsigned int advise = le16_to_cpu(v1->i_advise);
>> +	erofs_blk_t nblks = 0;
>>  
>>  	vi->data_mapping_mode = __inode_data_mapping(advise);
>>  
>> @@ -60,6 +61,10 @@ static int read_inode(struct inode *inode, void *data)
>>  			le32_to_cpu(v2->i_ctime_nsec);
>>  
>>  		inode->i_size = le64_to_cpu(v2->i_size);
>> +
>> +		/* total blocks for compressed files */
>> +		if (vi->data_mapping_mode == EROFS_INODE_LAYOUT_COMPRESSION)
>> +			nblks = v2->i_u.compressed_blocks;
> 
> Xiang,
> 
> It needs to use le32_to_cpu(). ;)

Already fixed in v3... Sorry about that...

Thanks,
Gao Xiang

> 
>>  	} else if (__inode_version(advise) == EROFS_INODE_LAYOUT_V1) {
>>  		struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
>>  
>> @@ -90,6 +95,8 @@ static int read_inode(struct inode *inode, void *data)
>>  			sbi->build_time_nsec;
>>  
>>  		inode->i_size = le32_to_cpu(v1->i_size);
>> +		if (vi->data_mapping_mode == EROFS_INODE_LAYOUT_COMPRESSION)
>> +			nblks = v1->i_u.compressed_blocks;
> 
> Ditto.
> 
> Thanks,
> 
>>  	} else {
>>  		errln("unsupported on-disk inode version %u of nid %llu",
>>  		      __inode_version(advise), vi->nid);
>> @@ -97,8 +104,11 @@ static int read_inode(struct inode *inode, void *data)
>>  		return -EIO;
>>  	}
>>  
>> -	/* measure inode.i_blocks as the generic filesystem */
>> -	inode->i_blocks = ((inode->i_size - 1) >> 9) + 1;
>> +	if (!nblks)
>> +		/* measure inode.i_blocks as generic filesystems */
>> +		inode->i_blocks = roundup(inode->i_size, EROFS_BLKSIZ) >> 9;
>> +	else
>> +		inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK;
>>  	return 0;
>>  }
>>  
>>

Re: [PATCH v2 2/2] staging: erofs: fix i_blocks calculation

[Dan Carpenter]

On Tue, May 28, 2019 at 11:02:12AM +0800, Chao Yu wrote:
> On 2019/5/28 10:36, Gao Xiang wrote:
> > For compressed files, i_blocks should not be calculated
> > by using i_size. i_u.compressed_blocks is used instead.
> > 
> > In addition, i_blocks was miscalculated for non-compressed
> > files previously, fix it as well.
> > 
> > Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
> > ---
> > change log v2:
> >  - fix description in commit message
> >  - fix to 'inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK'
> > 
> > Thanks,
> > Gao Xiang
> > 
> >  drivers/staging/erofs/inode.c | 14 ++++++++++++--
> >  1 file changed, 12 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
> > index 8da144943ed6..6e67e018784e 100644
> > --- a/drivers/staging/erofs/inode.c
> > +++ b/drivers/staging/erofs/inode.c
> > @@ -20,6 +20,7 @@ static int read_inode(struct inode *inode, void *data)
> >  	struct erofs_vnode *vi = EROFS_V(inode);
> >  	struct erofs_inode_v1 *v1 = data;
> >  	const unsigned int advise = le16_to_cpu(v1->i_advise);
> > +	erofs_blk_t nblks = 0;
> >  
> >  	vi->data_mapping_mode = __inode_data_mapping(advise);
> >  
> > @@ -60,6 +61,10 @@ static int read_inode(struct inode *inode, void *data)
> >  			le32_to_cpu(v2->i_ctime_nsec);
> >  
> >  		inode->i_size = le64_to_cpu(v2->i_size);
> > +
> > +		/* total blocks for compressed files */
> > +		if (vi->data_mapping_mode == EROFS_INODE_LAYOUT_COMPRESSION)
> > +			nblks = v2->i_u.compressed_blocks;
> 
> Xiang,
> 
> It needs to use le32_to_cpu(). ;)
> 

I wonder it the kbuild bot is going to send an email about that...
Hopefully these sorts of bugs get detected with Sparse CF=-D__CHECK_ENDIAN__

regards,
dan carpenter

Re: [PATCH v2 2/2] staging: erofs: fix i_blocks calculation

[Gao Xiang]

Hi Dan,

On 2019/5/28 14:57, Dan Carpenter wrote:
> On Tue, May 28, 2019 at 11:02:12AM +0800, Chao Yu wrote:
>> On 2019/5/28 10:36, Gao Xiang wrote:
>>> For compressed files, i_blocks should not be calculated
>>> by using i_size. i_u.compressed_blocks is used instead.
>>>
>>> In addition, i_blocks was miscalculated for non-compressed
>>> files previously, fix it as well.
>>>
>>> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
>>> ---
>>> change log v2:
>>>  - fix description in commit message
>>>  - fix to 'inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK'
>>>
>>> Thanks,
>>> Gao Xiang
>>>
>>>  drivers/staging/erofs/inode.c | 14 ++++++++++++--
>>>  1 file changed, 12 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
>>> index 8da144943ed6..6e67e018784e 100644
>>> --- a/drivers/staging/erofs/inode.c
>>> +++ b/drivers/staging/erofs/inode.c
>>> @@ -20,6 +20,7 @@ static int read_inode(struct inode *inode, void *data)
>>>  	struct erofs_vnode *vi = EROFS_V(inode);
>>>  	struct erofs_inode_v1 *v1 = data;
>>>  	const unsigned int advise = le16_to_cpu(v1->i_advise);
>>> +	erofs_blk_t nblks = 0;
>>>  
>>>  	vi->data_mapping_mode = __inode_data_mapping(advise);
>>>  
>>> @@ -60,6 +61,10 @@ static int read_inode(struct inode *inode, void *data)
>>>  			le32_to_cpu(v2->i_ctime_nsec);
>>>  
>>>  		inode->i_size = le64_to_cpu(v2->i_size);
>>> +
>>> +		/* total blocks for compressed files */
>>> +		if (vi->data_mapping_mode == EROFS_INODE_LAYOUT_COMPRESSION)
>>> +			nblks = v2->i_u.compressed_blocks;
>>
>> Xiang,
>>
>> It needs to use le32_to_cpu(). ;)
>>
> 
> I wonder it the kbuild bot is going to send an email about that...

Not yet, and v3 fixes it. I have no idea whether kbuild checks all version
or just the latest version...

> Hopefully these sorts of bugs get detected with Sparse CF=-D__CHECK_ENDIAN__

Yes, I missed this case by mistake.
These two patches are small, I didn't do too many static checking expect for checkpatch.pl.
v3 seems fine and I will take care later, Thanks for kindly suggestion. :)

Thanks,
Gao Xiang

> 
> regards,
> dan carpenter
> 

Re: [PATCH v2 2/2] staging: erofs: fix i_blocks calculation

[Chao Yu]

On 2019/5/28 14:57, Dan Carpenter wrote:
> On Tue, May 28, 2019 at 11:02:12AM +0800, Chao Yu wrote:
>> On 2019/5/28 10:36, Gao Xiang wrote:
>>> For compressed files, i_blocks should not be calculated
>>> by using i_size. i_u.compressed_blocks is used instead.
>>>
>>> In addition, i_blocks was miscalculated for non-compressed
>>> files previously, fix it as well.
>>>
>>> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
>>> ---
>>> change log v2:
>>>  - fix description in commit message
>>>  - fix to 'inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK'
>>>
>>> Thanks,
>>> Gao Xiang
>>>
>>>  drivers/staging/erofs/inode.c | 14 ++++++++++++--
>>>  1 file changed, 12 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
>>> index 8da144943ed6..6e67e018784e 100644
>>> --- a/drivers/staging/erofs/inode.c
>>> +++ b/drivers/staging/erofs/inode.c
>>> @@ -20,6 +20,7 @@ static int read_inode(struct inode *inode, void *data)
>>>  	struct erofs_vnode *vi = EROFS_V(inode);
>>>  	struct erofs_inode_v1 *v1 = data;
>>>  	const unsigned int advise = le16_to_cpu(v1->i_advise);
>>> +	erofs_blk_t nblks = 0;
>>>  
>>>  	vi->data_mapping_mode = __inode_data_mapping(advise);
>>>  
>>> @@ -60,6 +61,10 @@ static int read_inode(struct inode *inode, void *data)
>>>  			le32_to_cpu(v2->i_ctime_nsec);
>>>  
>>>  		inode->i_size = le64_to_cpu(v2->i_size);
>>> +
>>> +		/* total blocks for compressed files */
>>> +		if (vi->data_mapping_mode == EROFS_INODE_LAYOUT_COMPRESSION)
>>> +			nblks = v2->i_u.compressed_blocks;
>>
>> Xiang,
>>
>> It needs to use le32_to_cpu(). ;)
>>
> 
> I wonder it the kbuild bot is going to send an email about that...

0-day may do this a little later.

> Hopefully these sorts of bugs get detected with Sparse CF=-D__CHECK_ENDIAN__

Thanks, Dan, let's use this sparse flag more frequently to avoid such issue.

Thanks,

> 
> regards,
> dan carpenter
> 
> .
> 

[PATCH v3 1/2] staging: erofs: support statx

[Gao Xiang]

statx() has already been supported in commit a528d35e8bfc
("statx: Add a system call to make enhanced file info available"),
user programs can get more useful attributes.

Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
---
change log v3:
 - update attributes_mask to indicate bits which erofs support
   as Chao pointed out;
 - already tested with samples/vfs/test-statx.c;

Thanks,
Gao Xiang

 drivers/staging/erofs/inode.c    | 20 ++++++++++++++++++++
 drivers/staging/erofs/internal.h |  2 ++
 drivers/staging/erofs/namei.c    |  1 +
 3 files changed, 23 insertions(+)

diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
index c7d3b815a798..1c220900e1a0 100644
--- a/drivers/staging/erofs/inode.c
+++ b/drivers/staging/erofs/inode.c
@@ -285,7 +285,25 @@ struct inode *erofs_iget(struct super_block *sb,
 	return inode;
 }
 
+int erofs_getattr(const struct path *path, struct kstat *stat,
+		  u32 request_mask, unsigned int query_flags)
+{
+	struct inode *const inode = d_inode(path->dentry);
+	struct erofs_vnode *const vi = EROFS_V(inode);
+
+	if (vi->data_mapping_mode == EROFS_INODE_LAYOUT_COMPRESSION)
+		stat->attributes |= STATX_ATTR_COMPRESSED;
+
+	stat->attributes |= STATX_ATTR_IMMUTABLE;
+	stat->attributes_mask |= (STATX_ATTR_COMPRESSED |
+				  STATX_ATTR_IMMUTABLE);
+
+	generic_fillattr(inode, stat);
+	return 0;
+}
+
 const struct inode_operations erofs_generic_iops = {
+	.getattr = erofs_getattr,
 #ifdef CONFIG_EROFS_FS_XATTR
 	.listxattr = erofs_listxattr,
 #endif
@@ -294,6 +312,7 @@ const struct inode_operations erofs_generic_iops = {
 
 const struct inode_operations erofs_symlink_iops = {
 	.get_link = page_get_link,
+	.getattr = erofs_getattr,
 #ifdef CONFIG_EROFS_FS_XATTR
 	.listxattr = erofs_listxattr,
 #endif
@@ -302,6 +321,7 @@ const struct inode_operations erofs_symlink_iops = {
 
 const struct inode_operations erofs_fast_symlink_iops = {
 	.get_link = simple_get_link,
+	.getattr = erofs_getattr,
 #ifdef CONFIG_EROFS_FS_XATTR
 	.listxattr = erofs_listxattr,
 #endif
diff --git a/drivers/staging/erofs/internal.h b/drivers/staging/erofs/internal.h
index c47778b3fabd..911333cdeef4 100644
--- a/drivers/staging/erofs/internal.h
+++ b/drivers/staging/erofs/internal.h
@@ -556,6 +556,8 @@ static inline bool is_inode_fast_symlink(struct inode *inode)
 }
 
 struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid, bool dir);
+int erofs_getattr(const struct path *path, struct kstat *stat,
+		  u32 request_mask, unsigned int query_flags);
 
 /* namei.c */
 extern const struct inode_operations erofs_dir_iops;
diff --git a/drivers/staging/erofs/namei.c b/drivers/staging/erofs/namei.c
index d8d9dc9dab43..fd3ae78d0ba5 100644
--- a/drivers/staging/erofs/namei.c
+++ b/drivers/staging/erofs/namei.c
@@ -247,6 +247,7 @@ static struct dentry *erofs_lookup(struct inode *dir,
 
 const struct inode_operations erofs_dir_iops = {
 	.lookup = erofs_lookup,
+	.getattr = erofs_getattr,
 #ifdef CONFIG_EROFS_FS_XATTR
 	.listxattr = erofs_listxattr,
 #endif
-- 
2.17.1

[PATCH v3 2/2] staging: erofs: fix i_blocks calculation

[Gao Xiang]

For compressed files, i_blocks should not be calculated
by using i_size. use i_u.compressed_blocks instead.

In addition, i_blocks was miscalculated for non-compressed
files previously, fix it as well.

Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
---
change log v3:
 - wrap i.u.compressed_blocks with le32_to_cpu() as Chao pointed out;

change log v2:
 - fix description in commit message;
 - fix to 'inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK'.

Thanks,
Gao Xiang

 drivers/staging/erofs/inode.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
index 1c220900e1a0..9520419f746c 100644
--- a/drivers/staging/erofs/inode.c
+++ b/drivers/staging/erofs/inode.c
@@ -20,6 +20,7 @@ static int read_inode(struct inode *inode, void *data)
 	struct erofs_vnode *vi = EROFS_V(inode);
 	struct erofs_inode_v1 *v1 = data;
 	const unsigned int advise = le16_to_cpu(v1->i_advise);
+	erofs_blk_t nblks = 0;
 
 	vi->data_mapping_mode = __inode_data_mapping(advise);
 
@@ -60,6 +61,10 @@ static int read_inode(struct inode *inode, void *data)
 			le32_to_cpu(v2->i_ctime_nsec);
 
 		inode->i_size = le64_to_cpu(v2->i_size);
+
+		/* total blocks for compressed files */
+		if (vi->data_mapping_mode == EROFS_INODE_LAYOUT_COMPRESSION)
+			nblks = le32_to_cpu(v2->i_u.compressed_blocks);
 	} else if (__inode_version(advise) == EROFS_INODE_LAYOUT_V1) {
 		struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
 
@@ -90,6 +95,8 @@ static int read_inode(struct inode *inode, void *data)
 			sbi->build_time_nsec;
 
 		inode->i_size = le32_to_cpu(v1->i_size);
+		if (vi->data_mapping_mode == EROFS_INODE_LAYOUT_COMPRESSION)
+			nblks = le32_to_cpu(v1->i_u.compressed_blocks);
 	} else {
 		errln("unsupported on-disk inode version %u of nid %llu",
 		      __inode_version(advise), vi->nid);
@@ -97,8 +104,11 @@ static int read_inode(struct inode *inode, void *data)
 		return -EIO;
 	}
 
-	/* measure inode.i_blocks as the generic filesystem */
-	inode->i_blocks = ((inode->i_size - 1) >> 9) + 1;
+	if (!nblks)
+		/* measure inode.i_blocks as generic filesystems */
+		inode->i_blocks = roundup(inode->i_size, EROFS_BLKSIZ) >> 9;
+	else
+		inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK;
 	return 0;
 }
 
-- 
2.17.1

Re: [PATCH v3 2/2] staging: erofs: fix i_blocks calculation

[Chao Yu]

On 2019/5/28 11:19, Gao Xiang wrote:
> For compressed files, i_blocks should not be calculated
> by using i_size. use i_u.compressed_blocks instead.
> 
> In addition, i_blocks was miscalculated for non-compressed
> files previously, fix it as well.
> 
> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>

Reviewed-by: Chao Yu <yuchao0@huawei.com>

Thanks,

Re: [PATCH v3 1/2] staging: erofs: support statx

[Chao Yu]

On 2019/5/28 11:19, Gao Xiang wrote:
> statx() has already been supported in commit a528d35e8bfc
> ("statx: Add a system call to make enhanced file info available"),
> user programs can get more useful attributes.
> 
> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>

Reviewed-by: Chao Yu <yuchao0@huawei.com>

Thanks,

Re: [PATCH 1/2] staging: erofs: support statx

[Chao Yu]

On 2019/5/28 10:31, Gao Xiang wrote:
> statx() has already been supported in commit a528d35e8bfc
> ("statx: Add a system call to make enhanced file info available"),
> user programs can get more useful attributes.
> 
> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
> ---
>  drivers/staging/erofs/inode.c    | 18 ++++++++++++++++++
>  drivers/staging/erofs/internal.h |  2 ++
>  drivers/staging/erofs/namei.c    |  1 +
>  3 files changed, 21 insertions(+)
> 
> diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
> index c7d3b815a798..8da144943ed6 100644
> --- a/drivers/staging/erofs/inode.c
> +++ b/drivers/staging/erofs/inode.c
> @@ -285,7 +285,23 @@ struct inode *erofs_iget(struct super_block *sb,
>  	return inode;
>  }
>  
> +int erofs_getattr(const struct path *path, struct kstat *stat,
> +		  u32 request_mask, unsigned int query_flags)
> +{
> +	struct inode *const inode = d_inode(path->dentry);
> +	struct erofs_vnode *const vi = EROFS_V(inode);
> +
> +	if (vi->data_mapping_mode == EROFS_INODE_LAYOUT_COMPRESSION)
> +		stat->attributes |= STATX_ATTR_COMPRESSED;
> +
> +	stat->attributes |= STATX_ATTR_IMMUTABLE;

Xiang,

Should update stat->attributes_mask as well to indicate all erofs supported
attributes bits.

Thanks,

> +
> +	generic_fillattr(inode, stat);
> +	return 0;
> +}
> +
>  const struct inode_operations erofs_generic_iops = {
> +	.getattr = erofs_getattr,
>  #ifdef CONFIG_EROFS_FS_XATTR
>  	.listxattr = erofs_listxattr,
>  #endif
> @@ -294,6 +310,7 @@ const struct inode_operations erofs_generic_iops = {
>  
>  const struct inode_operations erofs_symlink_iops = {
>  	.get_link = page_get_link,
> +	.getattr = erofs_getattr,
>  #ifdef CONFIG_EROFS_FS_XATTR
>  	.listxattr = erofs_listxattr,
>  #endif
> @@ -302,6 +319,7 @@ const struct inode_operations erofs_symlink_iops = {
>  
>  const struct inode_operations erofs_fast_symlink_iops = {
>  	.get_link = simple_get_link,
> +	.getattr = erofs_getattr,
>  #ifdef CONFIG_EROFS_FS_XATTR
>  	.listxattr = erofs_listxattr,
>  #endif
> diff --git a/drivers/staging/erofs/internal.h b/drivers/staging/erofs/internal.h
> index c47778b3fabd..911333cdeef4 100644
> --- a/drivers/staging/erofs/internal.h
> +++ b/drivers/staging/erofs/internal.h
> @@ -556,6 +556,8 @@ static inline bool is_inode_fast_symlink(struct inode *inode)
>  }
>  
>  struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid, bool dir);
> +int erofs_getattr(const struct path *path, struct kstat *stat,
> +		  u32 request_mask, unsigned int query_flags);
>  
>  /* namei.c */
>  extern const struct inode_operations erofs_dir_iops;
> diff --git a/drivers/staging/erofs/namei.c b/drivers/staging/erofs/namei.c
> index d8d9dc9dab43..fd3ae78d0ba5 100644
> --- a/drivers/staging/erofs/namei.c
> +++ b/drivers/staging/erofs/namei.c
> @@ -247,6 +247,7 @@ static struct dentry *erofs_lookup(struct inode *dir,
>  
>  const struct inode_operations erofs_dir_iops = {
>  	.lookup = erofs_lookup,
> +	.getattr = erofs_getattr,
>  #ifdef CONFIG_EROFS_FS_XATTR
>  	.listxattr = erofs_listxattr,
>  #endif
> 

Re: [PATCH 1/2] staging: erofs: support statx

[Gao Xiang]

Hi Chao,

On 2019/5/28 10:44, Chao Yu wrote:
> On 2019/5/28 10:31, Gao Xiang wrote:
>> statx() has already been supported in commit a528d35e8bfc
>> ("statx: Add a system call to make enhanced file info available"),
>> user programs can get more useful attributes.
>>
>> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
>> ---
>>  drivers/staging/erofs/inode.c    | 18 ++++++++++++++++++
>>  drivers/staging/erofs/internal.h |  2 ++
>>  drivers/staging/erofs/namei.c    |  1 +
>>  3 files changed, 21 insertions(+)
>>
>> diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
>> index c7d3b815a798..8da144943ed6 100644
>> --- a/drivers/staging/erofs/inode.c
>> +++ b/drivers/staging/erofs/inode.c
>> @@ -285,7 +285,23 @@ struct inode *erofs_iget(struct super_block *sb,
>>  	return inode;
>>  }
>>  
>> +int erofs_getattr(const struct path *path, struct kstat *stat,
>> +		  u32 request_mask, unsigned int query_flags)
>> +{
>> +	struct inode *const inode = d_inode(path->dentry);
>> +	struct erofs_vnode *const vi = EROFS_V(inode);
>> +
>> +	if (vi->data_mapping_mode == EROFS_INODE_LAYOUT_COMPRESSION)
>> +		stat->attributes |= STATX_ATTR_COMPRESSED;
>> +
>> +	stat->attributes |= STATX_ATTR_IMMUTABLE;
> 
> Xiang,
> 
> Should update stat->attributes_mask as well to indicate all erofs supported
> attributes bits.

opps, my fault... I just verified these patches stability.
Will do in the next version.

Thanks,
Gao Xiang

> 
> Thanks,
> 
>> +
>> +	generic_fillattr(inode, stat);
>> +	return 0;
>> +}
>> +
>>  const struct inode_operations erofs_generic_iops = {
>> +	.getattr = erofs_getattr,
>>  #ifdef CONFIG_EROFS_FS_XATTR
>>  	.listxattr = erofs_listxattr,
>>  #endif
>> @@ -294,6 +310,7 @@ const struct inode_operations erofs_generic_iops = {
>>  
>>  const struct inode_operations erofs_symlink_iops = {
>>  	.get_link = page_get_link,
>> +	.getattr = erofs_getattr,
>>  #ifdef CONFIG_EROFS_FS_XATTR
>>  	.listxattr = erofs_listxattr,
>>  #endif
>> @@ -302,6 +319,7 @@ const struct inode_operations erofs_symlink_iops = {
>>  
>>  const struct inode_operations erofs_fast_symlink_iops = {
>>  	.get_link = simple_get_link,
>> +	.getattr = erofs_getattr,
>>  #ifdef CONFIG_EROFS_FS_XATTR
>>  	.listxattr = erofs_listxattr,
>>  #endif
>> diff --git a/drivers/staging/erofs/internal.h b/drivers/staging/erofs/internal.h
>> index c47778b3fabd..911333cdeef4 100644
>> --- a/drivers/staging/erofs/internal.h
>> +++ b/drivers/staging/erofs/internal.h
>> @@ -556,6 +556,8 @@ static inline bool is_inode_fast_symlink(struct inode *inode)
>>  }
>>  
>>  struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid, bool dir);
>> +int erofs_getattr(const struct path *path, struct kstat *stat,
>> +		  u32 request_mask, unsigned int query_flags);
>>  
>>  /* namei.c */
>>  extern const struct inode_operations erofs_dir_iops;
>> diff --git a/drivers/staging/erofs/namei.c b/drivers/staging/erofs/namei.c
>> index d8d9dc9dab43..fd3ae78d0ba5 100644
>> --- a/drivers/staging/erofs/namei.c
>> +++ b/drivers/staging/erofs/namei.c
>> @@ -247,6 +247,7 @@ static struct dentry *erofs_lookup(struct inode *dir,
>>  
>>  const struct inode_operations erofs_dir_iops = {
>>  	.lookup = erofs_lookup,
>> +	.getattr = erofs_getattr,
>>  #ifdef CONFIG_EROFS_FS_XATTR
>>  	.listxattr = erofs_listxattr,
>>  #endif
>>