Commit 168e9a76 authored by Huang Jianan's avatar Huang Jianan Committed by Gao Xiang
Browse files

erofs: add sysfs interface 

Add sysfs interface to configure erofs related parameters later.

Link: https://lore.kernel.org/r/20211201145436.4357-1-huangjianan@oppo.com


Reviewed-by: default avatarChao Yu <chao@kernel.org>
Reviewed-by: default avatarGao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: default avatarHuang Jianan <huangjianan@oppo.com>
Signed-off-by: default avatarGao Xiang <hsiangkao@linux.alibaba.com>
parent 7e508f2c

Documentation/ABI/testing/sysfs-fs-erofs

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+7 −0
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What:		/sys/fs/erofs/features/

Date:		November 2021

Contact:	"Huang Jianan" <huangjianan@oppo.com>

Description:	Shows all enabled kernel features.

		Supported features:

		zero_padding, compr_cfgs, big_pcluster, chunked_file,

		device_table, compr_head2, sb_chksum.

Documentation/filesystems/erofs.rst

+8 −0
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@@ -93,6 +93,14 @@ dax A legacy option which is an alias for ``dax=always``. 
device=%s              Specify a path to an extra device to be used together.

===================    =========================================================



Sysfs Entries

=============



Information about mounted erofs file systems can be found in /sys/fs/erofs.

Each mounted filesystem will have a directory in /sys/fs/erofs based on its

device name (i.e., /sys/fs/erofs/sda).

(see also Documentation/ABI/testing/sysfs-fs-erofs)



On-disk details

===============

fs/erofs/Makefile

+1 −1
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# SPDX-License-Identifier: GPL-2.0-only



obj-$(CONFIG_EROFS_FS) += erofs.o

erofs-objs := super.o inode.o data.o namei.o dir.o utils.o pcpubuf.o

erofs-objs := super.o inode.o data.o namei.o dir.o utils.o pcpubuf.o sysfs.o

erofs-$(CONFIG_EROFS_FS_XATTR) += xattr.o

erofs-$(CONFIG_EROFS_FS_ZIP) += decompressor.o zmap.o zdata.o

erofs-$(CONFIG_EROFS_FS_ZIP_LZMA) += decompressor_lzma.o

fs/erofs/internal.h

+12 −0
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@@ -134,6 +134,10 @@ struct erofs_sb_info { 
	u8 volume_name[16];             /* volume name */

	u32 feature_compat;

	u32 feature_incompat;



	/* sysfs support */

	struct kobject s_kobj;		/* /sys/fs/erofs/<devname> */

	struct completion s_kobj_unregister;

};



#define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info)
@@ -261,7 +265,9 @@ static inline bool erofs_sb_has_##name(struct erofs_sb_info *sbi) \ 
EROFS_FEATURE_FUNCS(zero_padding, incompat, INCOMPAT_ZERO_PADDING)

EROFS_FEATURE_FUNCS(compr_cfgs, incompat, INCOMPAT_COMPR_CFGS)

EROFS_FEATURE_FUNCS(big_pcluster, incompat, INCOMPAT_BIG_PCLUSTER)

EROFS_FEATURE_FUNCS(chunked_file, incompat, INCOMPAT_CHUNKED_FILE)

EROFS_FEATURE_FUNCS(device_table, incompat, INCOMPAT_DEVICE_TABLE)

EROFS_FEATURE_FUNCS(compr_head2, incompat, INCOMPAT_COMPR_HEAD2)

EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM)



/* atomic flag definitions */
@@ -498,6 +504,12 @@ int erofs_pcpubuf_growsize(unsigned int nrpages); 
void erofs_pcpubuf_init(void);

void erofs_pcpubuf_exit(void);



/* sysfs.c */

int erofs_register_sysfs(struct super_block *sb);

void erofs_unregister_sysfs(struct super_block *sb);

int __init erofs_init_sysfs(void);

void erofs_exit_sysfs(void);



/* utils.c / zdata.c */

struct page *erofs_allocpage(struct page **pagepool, gfp_t gfp);

static inline void erofs_pagepool_add(struct page **pagepool,

fs/erofs/super.c

+12 −0
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@@ -695,6 +695,10 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc) 
	if (err)

		return err;



	err = erofs_register_sysfs(sb);

	if (err)

		return err;



	erofs_info(sb, "mounted with root inode @ nid %llu.", ROOT_NID(sbi));

	return 0;

}
@@ -808,6 +812,7 @@ static void erofs_put_super(struct super_block *sb) 


	DBG_BUGON(!sbi);



	erofs_unregister_sysfs(sb);

	erofs_shrinker_unregister(sb);

#ifdef CONFIG_EROFS_FS_ZIP

	iput(sbi->managed_cache);
@@ -852,6 +857,10 @@ static int __init erofs_module_init(void) 
	if (err)

		goto zip_err;



	err = erofs_init_sysfs();

	if (err)

		goto sysfs_err;



	err = register_filesystem(&erofs_fs_type);

	if (err)

		goto fs_err;
@@ -859,6 +868,8 @@ static int __init erofs_module_init(void) 
	return 0;



fs_err:

	erofs_exit_sysfs();

sysfs_err:

	z_erofs_exit_zip_subsystem();

zip_err:

	z_erofs_lzma_exit();
@@ -877,6 +888,7 @@ static void __exit erofs_module_exit(void) 
	/* Ensure all RCU free inodes / pclusters are safe to be destroyed. */

	rcu_barrier();



	erofs_exit_sysfs();

	z_erofs_exit_zip_subsystem();

	z_erofs_lzma_exit();

	erofs_exit_shrinker();