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fs: add FS_IOC_GETFSSYSFSPATH

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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>
This commit is contained in:
Kent Overstreet
2024-02-06 21:56:19 -05:00
committed by Christian Brauner
parent e2f7dd6e55
commit ae8c511757
3 changed files with 70 additions and 0 deletions
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17
fs/ioctl.c
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@@ -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);