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>

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Jeff Layton 2025-11-11 09:12:58 -05:00 • committed by Christian Brauner

parent 8b99f6a8c1

commit 1602bad16d

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4 changed files with 76 additions and 5 deletions

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13

fs/fcntl.c

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45

fs/locks.c

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12

include/linux/filelock.h

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11

include/uapi/linux/fcntl.h

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