git: a58e222b3bcc - main - vfs: yield in vn_deallocate_impl() loop

[Ka Ho Ng]

The branch main has been updated by khng:

URL: https://cgit.FreeBSD.org/src/commit/?id=a58e222b3bcc5294ffbff88ff5f4c8d88b9dc324

commit a58e222b3bcc5294ffbff88ff5f4c8d88b9dc324
Author:     Ka Ho Ng <khng at FreeBSD.org>
AuthorDate: 2021-08-29 08:26:00 +0000
Commit:     Ka Ho Ng <khng at FreeBSD.org>
CommitDate: 2021-08-29 08:26:00 +0000

    vfs: yield in vn_deallocate_impl() loop
    
    Yield at the end of each loop iteration if there are remaining works as
    indicated by the value of *len updated by VOP_DEALLOCATE. Without this,
    when calling vop_stddeallocate to zero a large region, the
    implementation only zerofills a relatively small chunk and returns.
    
    Sponsored by:   The FreeBSD Foundation
    Reviewed by:    kib
    Differential Revision:  https://reviews.freebsd.org/D31705
---
 sys/kern/vfs_vnops.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c
index 3fce590519a8..bd512f73eae5 100644
--- a/sys/kern/vfs_vnops.c
+++ b/sys/kern/vfs_vnops.c
@@ -3519,6 +3519,8 @@ vn_deallocate_impl(struct vnode *vp, off_t *offset, off_t *length, int flags,
 				mp = NULL;
 			}
 		}
+		if (error == 0 && len != 0)
+			maybe_yield();
 	}
 out:
 	if (rl_cookie != NULL)