diff options
| author | Kent Overstreet <kent.overstreet@linux.dev> | 2024-02-06 21:56:19 -0500 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2024-02-12 13:13:59 +0100 |
| commit | ae8c511757304e0c393661b5ed2ad7073e2a351d (patch) | |
| tree | 06a6782f360ac08e5febc40130979f0a7356fcab /fs/ioctl.c | |
| parent | e2f7dd6e55d2f39734abcebd0cf673700e206197 (diff) | |
| download | linux-ae8c511757304e0c393661b5ed2ad7073e2a351d.tar.gz linux-ae8c511757304e0c393661b5ed2ad7073e2a351d.tar.bz2 linux-ae8c511757304e0c393661b5ed2ad7073e2a351d.zip | |
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.c | 17 |
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); |