Commit 1cf12c71 authored by Bo Liu (OpenAnolis)'s avatar Bo Liu (OpenAnolis) Committed by Gao Xiang
Browse files

erofs: Add support for FS_IOC_GETFSLABEL 



Add support for reading to the erofs volume label from the
FS_IOC_GETFSLABEL ioctls.

Signed-off-by: default avatarBo Liu (OpenAnolis) <liubo03@inspur.com>
Reviewed-by: default avatarGao Xiang <hsiangkao@linux.alibaba.com>
Reviewed-by: default avatarChao Yu <chao@kernel.org>
Reviewed-by: default avatarHongbo Li <lihongbo22@huawei.com>
Signed-off-by: default avatarGao Xiang <hsiangkao@linux.alibaba.com>
parent 334c0e49

fs/erofs/data.c

+4 −0
Original line number Diff line number Diff line
@@ -475,6 +475,10 @@ static loff_t erofs_file_llseek(struct file *file, loff_t offset, int whence) 
const struct file_operations erofs_file_fops = {

	.llseek		= erofs_file_llseek,

	.read_iter	= erofs_file_read_iter,

	.unlocked_ioctl = erofs_ioctl,

#ifdef CONFIG_COMPAT

	.compat_ioctl   = erofs_compat_ioctl,

#endif

	.mmap_prepare	= erofs_file_mmap_prepare,

	.get_unmapped_area = thp_get_unmapped_area,

	.splice_read	= filemap_splice_read,

fs/erofs/dir.c

+4 −0
Original line number Diff line number Diff line
@@ -123,4 +123,8 @@ const struct file_operations erofs_dir_fops = { 
	.llseek		= generic_file_llseek,

	.read		= generic_read_dir,

	.iterate_shared	= erofs_readdir,

	.unlocked_ioctl = erofs_ioctl,

#ifdef CONFIG_COMPAT

	.compat_ioctl   = erofs_compat_ioctl,

#endif

};

fs/erofs/inode.c

+36 −4
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ 
 * Copyright (C) 2021, Alibaba Cloud

 */

#include "xattr.h"

#include <linux/compat.h>

#include <trace/events/erofs.h>



static int erofs_fill_symlink(struct inode *inode, void *kaddr,
@@ -213,9 +214,6 @@ static int erofs_fill_inode(struct inode *inode) 
	switch (inode->i_mode & S_IFMT) {

	case S_IFREG:

		inode->i_op = &erofs_generic_iops;

		if (erofs_inode_is_data_compressed(vi->datalayout))

			inode->i_fop = &generic_ro_fops;

		else

		inode->i_fop = &erofs_file_fops;

		break;

	case S_IFDIR:
@@ -341,6 +339,40 @@ int erofs_getattr(struct mnt_idmap *idmap, const struct path *path, 
	return 0;

}



static int erofs_ioctl_get_volume_label(struct inode *inode, void __user *arg)

{

	struct erofs_sb_info *sbi = EROFS_I_SB(inode);

	int ret;



	if (!sbi->volume_name)

		ret = clear_user(arg, 1);

	else

		ret = copy_to_user(arg, sbi->volume_name,

				   strlen(sbi->volume_name));

	return ret ? -EFAULT : 0;

}



long erofs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)

{

	struct inode *inode = file_inode(filp);

	void __user *argp = (void __user *)arg;



	switch (cmd) {

	case FS_IOC_GETFSLABEL:

		return erofs_ioctl_get_volume_label(inode, argp);

	default:

		return -ENOTTY;

	}

}



#ifdef CONFIG_COMPAT

long erofs_compat_ioctl(struct file *filp, unsigned int cmd,

			unsigned long arg)

{

	return erofs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));

}

#endif



const struct inode_operations erofs_generic_iops = {

	.getattr = erofs_getattr,

	.listxattr = erofs_listxattr,

fs/erofs/internal.h

+5 −0
Original line number Diff line number Diff line
@@ -153,6 +153,7 @@ struct erofs_sb_info { 
	/* used for statfs, f_files - f_favail */

	u64 inos;



	char *volume_name;

	u32 feature_compat;

	u32 feature_incompat;
@@ -536,6 +537,10 @@ static inline struct bio *erofs_fscache_bio_alloc(struct erofs_map_dev *mdev) { 
static inline void erofs_fscache_submit_bio(struct bio *bio) {}

#endif



long erofs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);

long erofs_compat_ioctl(struct file *filp, unsigned int cmd,

			unsigned long arg);



#define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */



#endif	/* __EROFS_INTERNAL_H */

fs/erofs/super.c

+8 −0
Original line number Diff line number Diff line
@@ -343,6 +343,13 @@ static int erofs_read_superblock(struct super_block *sb) 
	sbi->fixed_nsec = le32_to_cpu(dsb->fixed_nsec);

	super_set_uuid(sb, (void *)dsb->uuid, sizeof(dsb->uuid));



	if (dsb->volume_name[0]) {

		sbi->volume_name = kstrndup(dsb->volume_name,

					    sizeof(dsb->volume_name), GFP_KERNEL);

		if (!sbi->volume_name)

			return -ENOMEM;

	}



	/* parse on-disk compression configurations */

	ret = z_erofs_parse_cfgs(sb, dsb);

	if (ret < 0)
@@ -822,6 +829,7 @@ static void erofs_sb_free(struct erofs_sb_info *sbi) 
	kfree(sbi->domain_id);

	if (sbi->dif0.file)

		fput(sbi->dif0.file);

	kfree(sbi->volume_name);

	kfree(sbi);

}