linux-kernel - Re: [PATCH v8 15/20] erofs: register fscache context for extra data blobs

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Date:   Fri, 8 Apr 2022 10:11:47 +0800
From:   JeffleXu <jefflexu@...ux.alibaba.com>
To:     dhowells@...hat.com, linux-cachefs@...hat.com, xiang@...nel.org,
        chao@...nel.org, linux-erofs@...ts.ozlabs.org,
        torvalds@...ux-foundation.org, gregkh@...uxfoundation.org,
        willy@...radead.org, linux-fsdevel@...r.kernel.org,
        joseph.qi@...ux.alibaba.com, bo.liu@...ux.alibaba.com,
        tao.peng@...ux.alibaba.com, gerry@...ux.alibaba.com,
        eguan@...ux.alibaba.com, linux-kernel@...r.kernel.org,
        luodaowen.backend@...edance.com, tianzichen@...ishou.com,
        fannaihao@...du.com
Subject: Re: [PATCH v8 15/20] erofs: register fscache context for extra data
 blobs



On 4/7/22 10:15 PM, Gao Xiang wrote:
> On Wed, Apr 06, 2022 at 03:56:07PM +0800, Jeffle Xu wrote:
>> Similar to the multi device mode, erofs could be mounted from one
>> primary data blob (mandatory) and multiple extra data blobs (optional).
>>
>> Register fscache context for each extra data blob.
>>
>> Signed-off-by: Jeffle Xu <jefflexu@...ux.alibaba.com>
>> ---
>>  fs/erofs/data.c     |  3 +++
>>  fs/erofs/internal.h |  2 ++
>>  fs/erofs/super.c    | 25 +++++++++++++++++--------
>>  3 files changed, 22 insertions(+), 8 deletions(-)
>>
>> diff --git a/fs/erofs/data.c b/fs/erofs/data.c
>> index bc22642358ec..14b64d960541 100644
>> --- a/fs/erofs/data.c
>> +++ b/fs/erofs/data.c
>> @@ -199,6 +199,7 @@ int erofs_map_dev(struct super_block *sb, struct erofs_map_dev *map)
>>  	map->m_bdev = sb->s_bdev;
>>  	map->m_daxdev = EROFS_SB(sb)->dax_dev;
>>  	map->m_dax_part_off = EROFS_SB(sb)->dax_part_off;
>> +	map->m_fscache = EROFS_SB(sb)->s_fscache;
>>  
>>  	if (map->m_deviceid) {
>>  		down_read(&devs->rwsem);
>> @@ -210,6 +211,7 @@ int erofs_map_dev(struct super_block *sb, struct erofs_map_dev *map)
>>  		map->m_bdev = dif->bdev;
>>  		map->m_daxdev = dif->dax_dev;
>>  		map->m_dax_part_off = dif->dax_part_off;
>> +		map->m_fscache = dif->fscache;
>>  		up_read(&devs->rwsem);
>>  	} else if (devs->extra_devices) {
>>  		down_read(&devs->rwsem);
>> @@ -227,6 +229,7 @@ int erofs_map_dev(struct super_block *sb, struct erofs_map_dev *map)
>>  				map->m_bdev = dif->bdev;
>>  				map->m_daxdev = dif->dax_dev;
>>  				map->m_dax_part_off = dif->dax_part_off;
>> +				map->m_fscache = dif->fscache;
>>  				break;
>>  			}
>>  		}
>> diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
>> index eb37b33bce37..90f7d6286a4f 100644
>> --- a/fs/erofs/internal.h
>> +++ b/fs/erofs/internal.h
>> @@ -49,6 +49,7 @@ typedef u32 erofs_blk_t;
>>  
>>  struct erofs_device_info {
>>  	char *path;
>> +	struct erofs_fscache *fscache;
>>  	struct block_device *bdev;
>>  	struct dax_device *dax_dev;
>>  	u64 dax_part_off;
>> @@ -482,6 +483,7 @@ static inline int z_erofs_map_blocks_iter(struct inode *inode,
>>  #endif	/* !CONFIG_EROFS_FS_ZIP */
>>  
>>  struct erofs_map_dev {
>> +	struct erofs_fscache *m_fscache;
>>  	struct block_device *m_bdev;
>>  	struct dax_device *m_daxdev;
>>  	u64 m_dax_part_off;
>> diff --git a/fs/erofs/super.c b/fs/erofs/super.c
>> index 9498b899b73b..8c7181cd37e6 100644
>> --- a/fs/erofs/super.c
>> +++ b/fs/erofs/super.c
>> @@ -259,15 +259,23 @@ static int erofs_init_devices(struct super_block *sb,
>>  		}
>>  		dis = ptr + erofs_blkoff(pos);
>>  
>> -		bdev = blkdev_get_by_path(dif->path,
>> -					  FMODE_READ | FMODE_EXCL,
>> -					  sb->s_type);
>> -		if (IS_ERR(bdev)) {
>> -			err = PTR_ERR(bdev);
>> -			break;
>> +		if (erofs_is_fscache_mode(sb)) {
>> +			err = erofs_fscache_register_cookie(sb, &dif->fscache,
>> +							    dif->path, false);
>> +			if (err)
>> +				break;
>> +		} else {
>> +			bdev = blkdev_get_by_path(dif->path,
>> +						  FMODE_READ | FMODE_EXCL,
>> +						  sb->s_type);
>> +			if (IS_ERR(bdev)) {
>> +				err = PTR_ERR(bdev);
>> +				break;
>> +			}
>> +			dif->bdev = bdev;
>> +			dif->dax_dev = fs_dax_get_by_bdev(bdev, &dif->dax_part_off);
> 
> Overly long line, please help split into 2 lines if possible.
> 

Will be fixed in the next version.


-- 
Thanks,
Jeffle