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Add IO_RANGELOCKED flag for vn_rdwr(9), which specifies that vnode is

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not locked, but range is.

Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
This commit is contained in:
Konstantin Belousov 2014-10-04 18:28:27 +00:00
parent 79ec4cf466
commit e3d6feceb1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=272534
2 changed files with 11 additions and 7 deletions
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17
sys/kern/vfs_vnops.c
View File

@ -504,13 +504,16 @@ vn_rdwr(enum uio_rw rw, struct vnode *vp, void *base, int len, off_t offset,
error = 0;
if ((ioflg & IO_NODELOCKED) == 0) {
if (rw == UIO_READ) {
rl_cookie = vn_rangelock_rlock(vp, offset,
offset + len);
} else {
rl_cookie = vn_rangelock_wlock(vp, offset,
offset + len);
}
if ((ioflg & IO_RANGELOCKED) == 0) {
if (rw == UIO_READ) {
rl_cookie = vn_rangelock_rlock(vp, offset,
offset + len);
} else {
rl_cookie = vn_rangelock_wlock(vp, offset,
offset + len);
}
} else
rl_cookie = NULL;
mp = NULL;
if (rw == UIO_WRITE) {
if (vp->v_type != VCHR &&

1
sys/sys/vnode.h
View File

@ -305,6 +305,7 @@ struct vattr {
#define IO_NORMAL 0x0800 /* operate on regular data */
#define IO_NOMACCHECK 0x1000 /* MAC checks unnecessary */
#define IO_BUFLOCKED 0x2000 /* ffs flag; indir buf is locked */
#define IO_RANGELOCKED 0x4000 /* range locked */
#define IO_SEQMAX 0x7F /* seq heuristic max value */
#define IO_SEQSHIFT 16 /* seq heuristic in upper 16 bits */