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authorKent Overstreet <kent.overstreet@linux.dev>2024-02-06 21:56:19 -0500
committerChristian Brauner <brauner@kernel.org>2024-02-12 13:13:59 +0100
commitae8c511757304e0c393661b5ed2ad7073e2a351d (patch)
tree06a6782f360ac08e5febc40130979f0a7356fcab /fs/ioctl.c
parente2f7dd6e55d2f39734abcebd0cf673700e206197 (diff)
fs: add FS_IOC_GETFSSYSFSPATH
Add a new ioctl for getting the sysfs name of a filesystem - the path under /sys/fs. This is going to let us standardize exporting data from sysfs across filesystems, e.g. time stats. The returned path will always be of the form "$FSTYP/$SYSFS_IDENTIFIER", where the sysfs identifier may be a UUID (for bcachefs) or a device name (xfs). Cc: Christian Brauner <brauner@kernel.org> Cc: Jan Kara <jack@suse.cz> Cc: Dave Chinner <dchinner@redhat.com> Cc: Darrick J. Wong <djwong@kernel.org> Cc: Theodore Ts'o <tytso@mit.edu> Cc: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev> Link: https://lore.kernel.org/r/20240207025624.1019754-6-kent.overstreet@linux.dev Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/ioctl.c')
-rw-r--r--fs/ioctl.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/fs/ioctl.c b/fs/ioctl.c
index 74eab9549383..1d5abfdf0f22 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -776,6 +776,20 @@ static int ioctl_getfsuuid(struct file *file, void __user *argp)
return copy_to_user(argp, &u, sizeof(u)) ? -EFAULT : 0;
}
+static int ioctl_get_fs_sysfs_path(struct file *file, void __user *argp)
+{
+ struct super_block *sb = file_inode(file)->i_sb;
+
+ if (!strlen(sb->s_sysfs_name))
+ return -ENOIOCTLCMD;
+
+ struct fs_sysfs_path u = {};
+
+ u.len = scnprintf(u.name, sizeof(u.name), "%s/%s", sb->s_type->name, sb->s_sysfs_name);
+
+ return copy_to_user(argp, &u, sizeof(u)) ? -EFAULT : 0;
+}
+
/*
* do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
* It's just a simple helper for sys_ioctl and compat_sys_ioctl.
@@ -861,6 +875,9 @@ static int do_vfs_ioctl(struct file *filp, unsigned int fd,
case FS_IOC_GETFSUUID:
return ioctl_getfsuuid(filp, argp);
+ case FS_IOC_GETFSSYSFSPATH:
+ return ioctl_get_fs_sysfs_path(filp, argp);
+
default:
if (S_ISREG(inode->i_mode))
return file_ioctl(filp, cmd, argp);