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vfs: expose delegation support to userland

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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>
This commit is contained in:
Jeff Layton
2025-11-11 09:12:58 -05:00
committed by Andrii Nakryiko
parent d65dbb412d
commit 4f10610ae5
1 changed files with 11 additions and 0 deletions
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11
include/uapi/linux/fcntl.h
View File

@@ -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.
*/