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Add non-blocking versions of nfsm_dissect() and friends, for use from

Browse Source 
socket callbacks or similar callers, from both the NFS client and the
server.
Instituted nfsm_dissect_nonblock(), nfsm_dissect_xx_nonblock(). And
nfsm_disct() now takes an extra M_TRYWAIT/M_DONTWAIT argument.

Submitted by:	Mohan Srinivasan mohans at yahoo-inc dot com
This commit is contained in:
Paul Saab 2004-12-06 17:33:52 +00:00
parent 5ddb073996
commit b8d0fc9581
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=138463
3 changed files with 30 additions and 5 deletions
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22
sys/nfs/nfs_common.c
View File

@ -76,6 +76,8 @@ nfstype nfsv3_type[9] = {
NFNON, NFREG, NFDIR, NFBLK, NFCHR, NFLNK, NFSOCK, NFFIFO, NFNON
};
static void *nfsm_dissect_xx_sub(int s, struct mbuf **md, caddr_t *dpos, int how);
u_quad_t
nfs_curusec(void)
{
@ -164,7 +166,7 @@ nfsm_mbuftouio(struct mbuf **mrep, struct uio *uiop, int siz, caddr_t *dpos)
* cases. (The macros use the vars. dpos and dpos2)
*/
void *
nfsm_disct(struct mbuf **mdp, caddr_t *dposp, int siz, int left)
nfsm_disct(struct mbuf **mdp, caddr_t *dposp, int siz, int left, int how)
{
struct mbuf *mp, *mp2;
int siz2, xfer;
@ -187,7 +189,9 @@ nfsm_disct(struct mbuf **mdp, caddr_t *dposp, int siz, int left)
} else if (siz > MHLEN) {
panic("nfs S too big");
} else {
MGET(mp2, M_TRYWAIT, MT_DATA);
MGET(mp2, how, MT_DATA);
if (mp2 == NULL)
return NULL;
mp2->m_next = mp->m_next;
mp->m_next = mp2;
mp->m_len -= left;
@ -266,6 +270,18 @@ nfsm_build_xx(int s, struct mbuf **mb, caddr_t *bpos)
void *
nfsm_dissect_xx(int s, struct mbuf **md, caddr_t *dpos)
{
return nfsm_dissect_xx_sub(s, md, dpos, M_TRYWAIT);
}
void *
nfsm_dissect_xx_nonblock(int s, struct mbuf **md, caddr_t *dpos)
{
return nfsm_dissect_xx_sub(s, md, dpos, M_DONTWAIT);
}
static void *
nfsm_dissect_xx_sub(int s, struct mbuf **md, caddr_t *dpos, int how)
{
int t1;
char *cp2;
@ -277,7 +293,7 @@ nfsm_dissect_xx(int s, struct mbuf **md, caddr_t *dpos)
*dpos += s;
return ret;
}
cp2 = nfsm_disct(md, dpos, s, t1);
cp2 = nfsm_disct(md, dpos, s, t1, how);
return cp2;
}

11
sys/nfs/nfs_common.h
View File

@ -48,7 +48,7 @@ extern nfstype nfsv3_type[];
int nfs_adv(struct mbuf **, caddr_t *, int, int);
u_quad_t nfs_curusec(void);
void *nfsm_disct(struct mbuf **, caddr_t *, int, int);
void *nfsm_disct(struct mbuf **, caddr_t *, int, int, int);
/* ****************************** */
/* Build request/reply phase macros */
@ -62,6 +62,7 @@ void *nfsm_build_xx(int s, struct mbuf **mb, caddr_t *bpos);
/* Interpretation phase macros */
void *nfsm_dissect_xx(int s, struct mbuf **md, caddr_t *dpos);
void *nfsm_dissect_xx_nonblock(int s, struct mbuf **md, caddr_t *dpos);
int nfsm_strsiz_xx(int *s, int m, struct mbuf **md, caddr_t *dpos);
int nfsm_adv_xx(int s, struct mbuf **md, caddr_t *dpos);
@ -94,6 +95,14 @@ do { \
(c)ret; \
})
#define nfsm_dissect_nonblock(c, s) \
({ \
void *ret; \
ret = nfsm_dissect_xx_nonblock((s), &md, &dpos); \
nfsm_dcheckp(ret, mrep); \
(c)ret; \
})
#define nfsm_strsiz(s,m) \
do { \
int t1; \

2
sys/nfsclient/nfs_subs.c
View File

@ -478,7 +478,7 @@ nfs_loadattrcache(struct vnode **vpp, struct mbuf **mdp, caddr_t *dposp,
md = *mdp;
t1 = (mtod(md, caddr_t) + md->m_len) - *dposp;
cp2 = nfsm_disct(mdp, dposp, NFSX_FATTR(v3), t1);
cp2 = nfsm_disct(mdp, dposp, NFSX_FATTR(v3), t1, M_TRYWAIT);
if (cp2 == NULL)
return EBADRPC;
fp = (struct nfs_fattr *)cp2;