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| author | Kent Overstreet <kent.overstreet@linux.dev> | 2024-02-06 21:56:15 -0500 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2024-02-08 21:19:59 +0100 |
| commit | a4af51ce229b1e1eab003966dbfebf9d80093a77 (patch) | |
| tree | 764a2915360b2a16216a5e7e873361e4716ad7a2 /include/linux/fs.h | |
| parent | 6613476e225e090cc9aad49be7fa504e290dd33d (diff) | |
| download | linux-a4af51ce229b1e1eab003966dbfebf9d80093a77.tar.gz | |
fs: super_set_uuid()
Some weird old filesytems have UUID-like things that we wish to expose
as UUIDs, but are smaller; add a length field so that the new
FS_IOC_(GET|SET)UUID ioctls can handle them in generic code.
And add a helper super_set_uuid(), for setting nonstandard length uuids.
Helper is now required for the new FS_IOC_GETUUID ioctl; if
super_set_uuid() hasn't been called, the ioctl won't be supported.
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Link: https://lore.kernel.org/r/20240207025624.1019754-2-kent.overstreet@linux.dev
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'include/linux/fs.h')
| -rw-r--r-- | include/linux/fs.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index ed5966a7049512..acdc56987cb152 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1257,6 +1257,7 @@ struct super_block { char s_id[32]; /* Informational name */ uuid_t s_uuid; /* UUID */ + u8 s_uuid_len; /* Default 16, possibly smaller for weird filesystems */ unsigned int s_max_links; @@ -2532,6 +2533,14 @@ extern __printf(2, 3) int super_setup_bdi_name(struct super_block *sb, char *fmt, ...); extern int super_setup_bdi(struct super_block *sb); +static inline void super_set_uuid(struct super_block *sb, const u8 *uuid, unsigned len) +{ + if (WARN_ON(len > sizeof(sb->s_uuid))) + len = sizeof(sb->s_uuid); + sb->s_uuid_len = len; + memcpy(&sb->s_uuid, uuid, len); +} + extern int current_umask(void); extern void ihold(struct inode * inode); |