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Message-ID: <20250922092937.2055-1-liubo03@inspur.com>
Date: Mon, 22 Sep 2025 17:29:36 +0800
From: Bo Liu <liubo03@...pur.com>
To: <xiang@...nel.org>, <chao@...nel.org>
CC: <linux-erofs@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>, Bo Liu
<liubo03@...pur.com>
Subject: [PATCH v4] erofs: Add support for FS_IOC_GETFSLABEL
From: Bo Liu (OpenAnolis) <liubo03@...pur.com>
Add support for reading to the erofs volume label from the
FS_IOC_GETFSLABEL ioctls.
Signed-off-by: Bo Liu (OpenAnolis) <liubo03@...pur.com>
---
v1: https://lore.kernel.org/linux-erofs/20250825120617.19746-1-liubo03@inspur.com/
v2: https://lore.kernel.org/linux-erofs/20250826103926.4424-1-liubo03@inspur.com/
v3: https://lore.kernel.org/linux-erofs/20250920060455.24002-1-liubo03@inspur.com/
change since v3:
- move functions into inode.
- remove useless comment.
fs/erofs/data.c | 4 ++++
fs/erofs/dir.c | 4 ++++
fs/erofs/inode.c | 40 ++++++++++++++++++++++++++++++++++++----
fs/erofs/internal.h | 6 ++++++
fs/erofs/super.c | 8 ++++++++
5 files changed, 58 insertions(+), 4 deletions(-)
diff --git a/fs/erofs/data.c b/fs/erofs/data.c
index 3b1ba571c728..8ca29962a3dd 100644
--- a/fs/erofs/data.c
+++ b/fs/erofs/data.c
@@ -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,
diff --git a/fs/erofs/dir.c b/fs/erofs/dir.c
index debf469ad6bd..32b4f5aa60c9 100644
--- a/fs/erofs/dir.c
+++ b/fs/erofs/dir.c
@@ -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
};
diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c
index 9a2f59721522..7a9a9081f890 100644
--- a/fs/erofs/inode.c
+++ b/fs/erofs/inode.c
@@ -213,10 +213,7 @@ 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;
+ inode->i_fop = &erofs_file_fops;
break;
case S_IFDIR:
inode->i_op = &erofs_dir_iops;
@@ -341,6 +338,41 @@ 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,
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index 4ccc5f0ee8df..b70902e00586 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -166,6 +166,8 @@ struct erofs_sb_info {
struct erofs_domain *domain;
char *fsid;
char *domain_id;
+
+ char *volume_name;
};
#define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info)
@@ -535,6 +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 */
diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index 1b529ace4db0..f1535ebe03ec 100644
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -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);
}
--
2.31.1
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