diff options
| author | Jeff Layton <jlayton@kernel.org> | 2025-11-11 09:12:58 -0500 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2025-11-12 09:38:37 +0100 |
| commit | 1602bad16d7df82faca6d7c70821117684a66f49 (patch) | |
| tree | 958ba87ee9d2c760efeb85c90487b82dbaeac0c4 /fs/fcntl.c | |
| parent | 8b99f6a8c116f664a6788737705f6da2772cc96a (diff) | |
| download | tip-1602bad16d7d.tar.gz | |
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 'fs/fcntl.c')
| -rw-r--r-- | fs/fcntl.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/fcntl.c b/fs/fcntl.c index 72f8433d910988..f93dbca0843557 100644 --- a/fs/fcntl.c +++ b/fs/fcntl.c @@ -445,6 +445,7 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg, struct file *filp) { void __user *argp = (void __user *)arg; + struct delegation deleg; int argi = (int)arg; struct flock flock; long err = -EINVAL; @@ -550,6 +551,18 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg, case F_SET_RW_HINT: err = fcntl_set_rw_hint(filp, arg); break; + case F_GETDELEG: + if (copy_from_user(&deleg, argp, sizeof(deleg))) + return -EFAULT; + err = fcntl_getdeleg(filp, &deleg); + if (!err && copy_to_user(argp, &deleg, sizeof(deleg))) + return -EFAULT; + break; + case F_SETDELEG: + if (copy_from_user(&deleg, argp, sizeof(deleg))) + return -EFAULT; + err = fcntl_setdeleg(fd, filp, &deleg); + break; default: break; } |