diff options
| author | Jeff Layton <jlayton@kernel.org> | 2025-11-11 17:12:58 +0300 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2025-11-12 11:38:37 +0300 |
| commit | 1602bad16d7df82faca6d7c70821117684a66f49 (patch) | |
| tree | 958ba87ee9d2c760efeb85c90487b82dbaeac0c4 /include | |
| parent | 8b99f6a8c116f664a6788737705f6da2772cc96a (diff) | |
| download | linux-1602bad16d7df82faca6d7c70821117684a66f49.tar.xz | |
vfs: expose delegation support to userland
Now that support for recallable directory delegations is available,
expose this functionality to userland with new F_SETDELEG and F_GETDELEG
commands for fcntl().
Note that this also allows userland to request a FL_DELEG type lease on
files too. Userland applications that do will get signalled when there
are metadata changes in addition to just data changes (which is a
limitation of FL_LEASE leases).
These commands accept a new "struct delegation" argument that contains a
flags field for future expansion.
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20251111-dir-deleg-ro-v6-17-52f3feebb2f2@kernel.org
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/filelock.h | 12 | ||||
| -rw-r--r-- | include/uapi/linux/fcntl.h | 11 |
2 files changed, 23 insertions, 0 deletions
diff --git a/include/linux/filelock.h b/include/linux/filelock.h index 208d108df2d7..54b824c05299 100644 --- a/include/linux/filelock.h +++ b/include/linux/filelock.h @@ -159,6 +159,8 @@ int fcntl_setlk64(unsigned int, struct file *, unsigned int, int fcntl_setlease(unsigned int fd, struct file *filp, int arg); int fcntl_getlease(struct file *filp); +int fcntl_setdeleg(unsigned int fd, struct file *filp, struct delegation *deleg); +int fcntl_getdeleg(struct file *filp, struct delegation *deleg); static inline bool lock_is_unlock(struct file_lock *fl) { @@ -278,6 +280,16 @@ static inline int fcntl_getlease(struct file *filp) return F_UNLCK; } +static inline int fcntl_setdeleg(unsigned int fd, struct file *filp, struct delegation *deleg) +{ + return -EINVAL; +} + +static inline int fcntl_getdeleg(struct file *filp, struct delegation *deleg) +{ + return -EINVAL; +} + static inline bool lock_is_unlock(struct file_lock *fl) { return false; diff --git a/include/uapi/linux/fcntl.h b/include/uapi/linux/fcntl.h index 3741ea1b73d8..008fac15e573 100644 --- a/include/uapi/linux/fcntl.h +++ b/include/uapi/linux/fcntl.h @@ -79,6 +79,17 @@ */ #define RWF_WRITE_LIFE_NOT_SET RWH_WRITE_LIFE_NOT_SET +/* Set/Get delegations */ +#define F_GETDELEG (F_LINUX_SPECIFIC_BASE + 15) +#define F_SETDELEG (F_LINUX_SPECIFIC_BASE + 16) + +/* Argument structure for F_GETDELEG and F_SETDELEG */ +struct delegation { + uint32_t d_flags; /* Must be 0 */ + uint16_t d_type; /* F_RDLCK, F_WRLCK, F_UNLCK */ + uint16_t __pad; /* Must be 0 */ +}; + /* * Types of directory notifications that may be requested. */ |