diff options
| -rw-r--r-- | sys/nfs/nfs_common.c | 67 | ||||
| -rw-r--r-- | sys/nfs/nfs_common.h | 1 | ||||
| -rw-r--r-- | sys/nfsclient/nfs_krpc.c | 67 | ||||
| -rw-r--r-- | sys/nfsserver/nfs.h | 1 | ||||
| -rw-r--r-- | sys/nfsserver/nfs_fha.c | 4 | ||||
| -rw-r--r-- | sys/nfsserver/nfs_srvkrpc.c | 59 |
6 files changed, 73 insertions, 126 deletions
diff --git a/sys/nfs/nfs_common.c b/sys/nfs/nfs_common.c index 6f42645..abf575f 100644 --- a/sys/nfs/nfs_common.c +++ b/sys/nfs/nfs_common.c @@ -56,6 +56,7 @@ __FBSDID("$FreeBSD$"); #include <sys/malloc.h> #include <sys/sysent.h> #include <sys/syscall.h> +#include <sys/sysctl.h> #include <vm/vm.h> #include <vm/vm_object.h> @@ -78,6 +79,16 @@ nfstype nfsv3_type[9] = { static void *nfsm_dissect_xx_sub(int s, struct mbuf **md, caddr_t *dpos, int how); +SYSCTL_DECL(_vfs_nfs); + +static int nfs_realign_test; +SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_test, CTLFLAG_RD, &nfs_realign_test, + 0, "Number of realign tests done"); + +static int nfs_realign_count; +SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_count, CTLFLAG_RD, &nfs_realign_count, + 0, "Number of mbuf realignments done"); + u_quad_t nfs_curusec(void) { @@ -337,3 +348,59 @@ nfsm_adv_xx(int s, struct mbuf **md, caddr_t *dpos) return (t1); return (0); } + +/* + * Check for badly aligned mbuf data and realign by copying the unaligned + * portion of the data into a new mbuf chain and freeing the portions of the + * old chain that were replaced. + * + * We cannot simply realign the data within the existing mbuf chain because + * the underlying buffers may contain other rpc commands and we cannot afford + * to overwrite them. + * + * We would prefer to avoid this situation entirely. The situation does not + * occur with NFS/UDP and is supposed to only occassionally occur with TCP. + * Use vfs.nfs.realign_count and realign_test to check this. + */ +int +nfs_realign(struct mbuf **pm, int how) +{ + struct mbuf *m, *n; + int off; + + ++nfs_realign_test; + while ((m = *pm) != NULL) { + if (!nfsm_aligned(m->m_len, u_int32_t) || + !nfsm_aligned(mtod(m, intptr_t), u_int32_t)) { + /* + * NB: we can't depend on m_pkthdr.len to help us + * decide what to do here. May not be worth doing + * the m_length calculation as m_copyback will + * expand the mbuf chain below as needed. + */ + if (m_length(m, NULL) >= MINCLSIZE) { + /* NB: m_copyback handles space > MCLBYTES */ + n = m_getcl(how, MT_DATA, 0); + } else + n = m_get(how, MT_DATA); + if (n == NULL) + return (ENOMEM); + /* + * Align the remainder of the mbuf chain. + */ + n->m_len = 0; + off = 0; + while (m != NULL) { + m_copyback(n, off, m->m_len, mtod(m, caddr_t)); + off += m->m_len; + m = m->m_next; + } + m_freem(*pm); + *pm = n; + ++nfs_realign_count; + break; + } + pm = &m->m_next; + } + return (0); +} diff --git a/sys/nfs/nfs_common.h b/sys/nfs/nfs_common.h index 9ad1c11..1c0b315 100644 --- a/sys/nfs/nfs_common.h +++ b/sys/nfs/nfs_common.h @@ -48,6 +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, int); +int nfs_realign(struct mbuf **, int); /* ****************************** */ /* Build request/reply phase macros */ diff --git a/sys/nfsclient/nfs_krpc.c b/sys/nfsclient/nfs_krpc.c index 8b23682..bfb1ea1 100644 --- a/sys/nfsclient/nfs_krpc.c +++ b/sys/nfsclient/nfs_krpc.c @@ -87,8 +87,6 @@ uint32_t nfsclient_nfs3_start_probes[NFS_NPROCS]; uint32_t nfsclient_nfs3_done_probes[NFS_NPROCS]; #endif -static int nfs_realign_test; -static int nfs_realign_count; static int nfs_bufpackets = 4; static int nfs_reconnects; static int nfs3_jukebox_delay = 10; @@ -97,10 +95,6 @@ static int fake_wchan; SYSCTL_DECL(_vfs_nfs); -SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_test, CTLFLAG_RW, &nfs_realign_test, 0, - "Number of realign tests done"); -SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_count, CTLFLAG_RW, &nfs_realign_count, 0, - "Number of mbuf realignments done"); SYSCTL_INT(_vfs_nfs, OID_AUTO, bufpackets, CTLFLAG_RW, &nfs_bufpackets, 0, "Buffer reservation size 2 < x < 64"); SYSCTL_INT(_vfs_nfs, OID_AUTO, reconnects, CTLFLAG_RD, &nfs_reconnects, 0, @@ -403,65 +397,6 @@ nfs_feedback(int type, int proc, void *arg) } /* - * nfs_realign: - * - * Check for badly aligned mbuf data and realign by copying the unaligned - * portion of the data into a new mbuf chain and freeing the portions - * of the old chain that were replaced. - * - * We cannot simply realign the data within the existing mbuf chain - * because the underlying buffers may contain other rpc commands and - * we cannot afford to overwrite them. - * - * We would prefer to avoid this situation entirely. The situation does - * not occur with NFS/UDP and is supposed to only occassionally occur - * with TCP. Use vfs.nfs.realign_count and realign_test to check this. - * - */ -static int -nfs_realign(struct mbuf **pm, int hsiz) -{ - struct mbuf *m, *n; - int off, space; - - ++nfs_realign_test; - while ((m = *pm) != NULL) { - if ((m->m_len & 0x3) || (mtod(m, intptr_t) & 0x3)) { - /* - * NB: we can't depend on m_pkthdr.len to help us - * decide what to do here. May not be worth doing - * the m_length calculation as m_copyback will - * expand the mbuf chain below as needed. - */ - space = m_length(m, NULL); - if (space >= MINCLSIZE) { - /* NB: m_copyback handles space > MCLBYTES */ - n = m_getcl(M_DONTWAIT, MT_DATA, 0); - } else - n = m_get(M_DONTWAIT, MT_DATA); - if (n == NULL) - return (ENOMEM); - /* - * Align the remainder of the mbuf chain. - */ - n->m_len = 0; - off = 0; - while (m != NULL) { - m_copyback(n, off, m->m_len, mtod(m, caddr_t)); - off += m->m_len; - m = m->m_next; - } - m_freem(*pm); - *pm = n; - ++nfs_realign_count; - break; - } - pm = &m->m_next; - } - return (0); -} - -/* * nfs_request - goes something like this * - fill in request struct * - links it into list @@ -589,7 +524,7 @@ tryagain: * These could cause pointer alignment problems, so copy them to * well aligned mbufs. */ - error = nfs_realign(&mrep, 2 * NFSX_UNSIGNED); + error = nfs_realign(&mrep, M_DONTWAIT); if (error == ENOMEM) { m_freem(mrep); AUTH_DESTROY(auth); diff --git a/sys/nfsserver/nfs.h b/sys/nfsserver/nfs.h index 00dbe5b..bb1893e 100644 --- a/sys/nfsserver/nfs.h +++ b/sys/nfsserver/nfs.h @@ -239,7 +239,6 @@ extern int nfs_debug; #endif -void nfs_realign(struct mbuf **); struct mbuf *nfs_rephead(int, struct nfsrv_descript *, int, struct mbuf **, caddr_t *); void nfsm_srvfattr(struct nfsrv_descript *, struct vattr *, diff --git a/sys/nfsserver/nfs_fha.c b/sys/nfsserver/nfs_fha.c index 25e930f..76537d7 100644 --- a/sys/nfsserver/nfs_fha.c +++ b/sys/nfsserver/nfs_fha.c @@ -202,7 +202,9 @@ fha_extract_info(struct svc_req *req, struct fha_info *i) procnum == NFSPROC_NULL) goto out; - nfs_realign(&req->rq_args); + error = nfs_realign(&req->rq_args, M_DONTWAIT); + if (error) + goto out; md = req->rq_args; dpos = mtod(md, caddr_t); diff --git a/sys/nfsserver/nfs_srvkrpc.c b/sys/nfsserver/nfs_srvkrpc.c index bdfe424..512373b 100644 --- a/sys/nfsserver/nfs_srvkrpc.c +++ b/sys/nfsserver/nfs_srvkrpc.c @@ -96,8 +96,6 @@ SYSCTL_DECL(_vfs_nfsrv); SVCPOOL *nfsrv_pool; int nfsd_waiting = 0; int nfsrv_numnfsd = 0; -static int nfs_realign_test; -static int nfs_realign_count; struct callout nfsrv_callout; static eventhandler_tag nfsrv_nmbclusters_tag; @@ -111,10 +109,6 @@ SYSCTL_INT(_vfs_nfsrv, OID_AUTO, gatherdelay, CTLFLAG_RW, SYSCTL_INT(_vfs_nfsrv, OID_AUTO, gatherdelay_v3, CTLFLAG_RW, &nfsrvw_procrastinate_v3, 0, "Delay in seconds for NFSv3 write gathering"); -SYSCTL_INT(_vfs_nfsrv, OID_AUTO, realign_test, CTLFLAG_RW, - &nfs_realign_test, 0, ""); -SYSCTL_INT(_vfs_nfsrv, OID_AUTO, realign_count, CTLFLAG_RW, - &nfs_realign_count, 0, ""); static int nfssvc_addsock(struct file *, struct thread *); static int nfssvc_nfsd(struct thread *, struct nfsd_nfsd_args *); @@ -250,57 +244,6 @@ nfs_rephead(int siz, struct nfsrv_descript *nd, int err, return (mreq); } -/* - * nfs_realign: - * - * Check for badly aligned mbuf data and realign by copying the unaligned - * portion of the data into a new mbuf chain and freeing the portions - * of the old chain that were replaced. - * - * We cannot simply realign the data within the existing mbuf chain - * because the underlying buffers may contain other rpc commands and - * we cannot afford to overwrite them. - * - * We would prefer to avoid this situation entirely. The situation does - * not occur with NFS/UDP and is supposed to only occassionally occur - * with TCP. Use vfs.nfs.realign_count and realign_test to check this. - */ -void -nfs_realign(struct mbuf **pm) /* XXX COMMON */ -{ - struct mbuf *m; - struct mbuf *n = NULL; - int off = 0; - - ++nfs_realign_test; - while ((m = *pm) != NULL) { - if ((m->m_len & 0x3) || (mtod(m, intptr_t) & 0x3)) { - MGET(n, M_WAIT, MT_DATA); - if (m->m_len >= MINCLSIZE) { - MCLGET(n, M_WAIT); - } - n->m_len = 0; - break; - } - pm = &m->m_next; - } - - /* - * If n is non-NULL, loop on m copying data, then replace the - * portion of the chain that had to be realigned. - */ - if (n != NULL) { - ++nfs_realign_count; - while (m) { - m_copyback(n, off, m->m_len, mtod(m, caddr_t)); - off += m->m_len; - m = m->m_next; - } - m_freem(*pm); - *pm = n; - } -} - static void nfssvc_program(struct svc_req *rqst, SVCXPRT *xprt) { @@ -334,7 +277,7 @@ nfssvc_program(struct svc_req *rqst, SVCXPRT *xprt) mreq = mrep = NULL; mreq = rqst->rq_args; rqst->rq_args = NULL; - nfs_realign(&mreq); + (void)nfs_realign(&mreq, M_WAIT); /* * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 - |
