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vfs: fix rangelock range in vn_rdwr() for IO_APPEND

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vn_rdwr() must lock the entire file range for IO_APPEND
just like vn_io_fault() does for O_APPEND.

Reviewed by:	kib, imp, mckusick
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D28008
This commit is contained in:
Chuck Silvers 2021-01-06 12:04:25 -08:00
parent 79eca6520e
commit 11403bdeb4
1 changed files with 2 additions and 0 deletions
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2
sys/kern/vfs_vnops.c
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@ -584,6 +584,8 @@ vn_rdwr(enum uio_rw rw, struct vnode *vp, void *base, int len, off_t offset,
if (rw == UIO_READ) {
rl_cookie = vn_rangelock_rlock(vp, offset,
offset + len);
} else if ((ioflg & IO_APPEND) != 0) {
rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX);
} else {
rl_cookie = vn_rangelock_wlock(vp, offset,
offset + len);