linux-toradex.git/fs/erofs/sysfs.c, branch v6.7

erofs: make kobj_type structures constant

2023-02-15T00:11:26+00:00

Since commit ee6d3dd4ed48 ("driver core: make kobj_type constant.")
the driver core allows the usage of const struct kobj_type.

Take advantage of this to constify the structure definitions to prevent
modification at runtime.

Signed-off-by: Thomas Weißschuh 
Acked-by: Gao Xiang 
Reviewed-by: Jingbo Xu 
Reviewed-by: Yue Hu 
Reviewed-by: Chao Yu 
Link: https://lore.kernel.org/r/20230209-kobj_type-erofs-v1-1-078c945e2c4b@weissschuh.net
Signed-off-by: Gao Xiang

erofs: fix use-after-free of fsid and domain_id string

2022-11-10T01:53:20+00:00

When erofs instance is remounted with fsid or domain_id mount option
specified, the original fsid and domain_id string pointer in sbi->opt
is directly overridden with the fsid and domain_id string in the new
fs_context, without freeing the original fsid and domain_id string.
What's worse, when the new fsid and domain_id string is transferred to
sbi, they are not reset to NULL in fs_context, and thus they are freed
when remount finishes, while sbi is still referring to these strings.

Reconfiguration for fsid and domain_id seems unusual. Thus clarify this
restriction explicitly and dump a warning when users are attempting to
do this.

Besides, to fix the use-after-free issue, move fsid and domain_id from
erofs_mount_opts to outside.

Fixes: c6be2bd0a5dd ("erofs: register fscache volume")
Fixes: 8b7adf1dff3d ("erofs: introduce fscache-based domain")
Signed-off-by: Jingbo Xu 
Reviewed-by: Jia Zhu 
Reviewed-by: Chao Yu 
Link: https://lore.kernel.org/r/20221021023153.1330-1-jefflexu@linux.alibaba.com
Signed-off-by: Gao Xiang

erofs: introduce partial-referenced pclusters

2022-09-26T15:55:43+00:00

Due to deduplication for compressed data, pclusters can be partially
referenced with their prefixes.

Together with the user-space implementation, it enables EROFS
variable-length global compressed data deduplication with rolling
hash.

Link: https://lore.kernel.org/r/20220923014915.4362-1-hsiangkao@linux.alibaba.com
Reviewed-by: Yue Hu 
Signed-off-by: Gao Xiang

erofs: support on-disk compressed fragments data

2022-09-26T15:55:39+00:00

Introduce on-disk compressed fragments data feature.

This approach adds a new field called `h_fragmentoff' in the per-file
compression header to indicate the fragment offset of each tail pcluster
or the whole file in the special packed inode.

Similar to ztailpacking, it will also find and record the 'headlcn'
of the tail pcluster when initializing per-inode zmap for making
follow-on requests more easy.

Signed-off-by: Yue Hu 
Reviewed-by: Gao Xiang 
Link: https://lore.kernel.org/r/YzHKxcFTlHGgXeH9@B-P7TQMD6M-0146.local
Signed-off-by: Gao Xiang

erofs: introduce 'domain_id' mount option

2022-09-20T00:01:54+00:00

Introduce 'domain_id' mount option to enable shared domain sementics.
In which case, the related cookie is shared if two mountpoints in the
same domain have the same data blob. Users could specify the name of
domain by this mount option.

Signed-off-by: Jia Zhu 
Reviewed-by: Jingbo Xu 
Link: https://lore.kernel.org/r/20220918043456.147-7-zhujia.zj@bytedance.com
Signed-off-by: Gao Xiang

erofs: add 'fsid' mount option

2022-05-17T16:11:21+00:00

Introduce 'fsid' mount option to enable on-demand read sementics, in
which case, erofs will be mounted from data blobs. Users could specify
the name of primary data blob by this mount option.

Signed-off-by: Jeffle Xu 
Reviewed-by: Gao Xiang 
Link: https://lore.kernel.org/r/20220425122143.56815-22-jefflexu@linux.alibaba.com
Acked-by: Chao Yu 
Tested-by: Zichen Tian 
Tested-by: Jia Zhu 
Tested-by: Yan Song 
Signed-off-by: Gao Xiang

fs: erofs: add sanity check for kobject in erofs_unregister_sysfs

2022-03-16T16:09:02+00:00

Syzkaller hit 'WARNING: kobject bug in erofs_unregister_sysfs'. This bug
is triggered by injecting fault in kobject_init_and_add of
erofs_unregister_sysfs.

Fix this by adding sanity check for kobject in erofs_unregister_sysfs

Note that I've tested the patch and the crash does not occur any more.

Link: https://lore.kernel.org/r/20220315132814.12332-1-dzm91@hust.edu.cn
Signed-off-by: Dongliang Mu 
Fixes: 168e9a76200c ("erofs: add sysfs interface")
Reviewed-by: Gao Xiang 
Reviewed-by: Chao Yu 
Signed-off-by: Gao Xiang

erofs: add on-disk compressed tail-packing inline support

2021-12-30T16:51:10+00:00

Introduces erofs compressed tail-packing inline support.

This approach adds a new field called `h_idata_size' in the
per-file compression header to indicate the encoded size of
each tail-packing pcluster.

At runtime, it will find the start logical offset of the tail
pcluster when initializing per-inode zmap and record such
extent (headlcn, idataoff) information to the in-memory inode.
Therefore, follow-on requests can directly recognize if one
pcluster is a tail-packing inline pcluster or not.

Link: https://lore.kernel.org/r/20211228054604.114518-6-hsiangkao@linux.alibaba.com
Reviewed-by: Chao Yu 
Signed-off-by: Yue Hu 
Signed-off-by: Gao Xiang

erofs: add sysfs node to control sync decompression strategy

2021-12-08T01:42:18+00:00

Although readpage is a synchronous path, there will be no additional
kworker scheduling overhead in non-atomic contexts together with
dm-verity.

Let's add a sysfs node to disable sync decompression as an option.

Link: https://lore.kernel.org/r/20211206143552.8384-1-huangjianan@oppo.com
Reviewed-by: Chao Yu 
Signed-off-by: Huang Jianan 
Signed-off-by: Gao Xiang

erofs: add sysfs interface

2021-12-08T01:40:37+00:00

Add sysfs interface to configure erofs related parameters later.

Link: https://lore.kernel.org/r/20211201145436.4357-1-huangjianan@oppo.com
Reviewed-by: Chao Yu 
Reviewed-by: Gao Xiang 
Signed-off-by: Huang Jianan 
Signed-off-by: Gao Xiang