mirror of
https://github.com/freebsd/freebsd-src
synced 2024-09-23 02:04:46 +00:00
Various fixes from John Dyson:
1) Rewrote screwy code that uses an incore buffer without making it busy. 2) Use B_CACHE instead of B_DONE in cases where it is appropriate. 3) Minor code optimization. This *might* fix kern/345 submitted by Heikki Suonsivu.
This commit is contained in:
David Greenman
parent
ec4f9fb0ee
commit
8cbf8eafa6
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=7871
|
|
@ -34,7 +34,7 @@
|
|||
* SUCH DAMAGE.
|
||||
*
|
||||
* @(#)nfs_bio.c 8.5 (Berkeley) 1/4/94
|
||||
* $Id: nfs_bio.c,v 1.10 1995/02/03 03:40:08 davidg Exp $
|
||||
* $Id: nfs_bio.c,v 1.11 1995/03/04 03:24:34 davidg Exp $
|
||||
*/
|
||||
|
||||
#include <sys/param.h>
|
||||
|
|
@ -78,8 +78,7 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
struct proc *p;
|
||||
struct nfsmount *nmp;
|
||||
daddr_t lbn, rabn;
|
||||
caddr_t baddr;
|
||||
int got_buf = 0, nra, error = 0, n = 0, on = 0, not_readin;
|
||||
int nra, error = 0, n = 0, on = 0, not_readin;
|
||||
|
||||
#ifdef lint
|
||||
ioflag = ioflag;
|
||||
|
|
@ -191,7 +190,6 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
};
|
||||
return (error);
|
||||
}
|
||||
baddr = (caddr_t)0;
|
||||
switch (vp->v_type) {
|
||||
case VREG:
|
||||
nfsstats.biocache_reads++;
|
||||
|
|
@ -211,7 +209,7 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
rabp = nfs_getcacheblk(vp, rabn, biosize, p);
|
||||
if (!rabp)
|
||||
return (EINTR);
|
||||
if ((rabp->b_flags & (B_DELWRI | B_DONE)) == 0) {
|
||||
if ((rabp->b_flags & B_DELWRI) == 0) {
|
||||
rabp->b_flags |= (B_READ | B_ASYNC);
|
||||
vfs_busy_pages(rabp, 0);
|
||||
if (nfs_asyncio(rabp, cred)) {
|
||||
|
|
@ -232,25 +230,18 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
* Otherwise, get the block and write back/read in,
|
||||
* as required.
|
||||
*/
|
||||
if ((bp = incore(vp, lbn)) &&
|
||||
(bp->b_flags & (B_BUSY | B_WRITEINPROG)) ==
|
||||
(B_BUSY | B_WRITEINPROG))
|
||||
got_buf = 0;
|
||||
else {
|
||||
again:
|
||||
bp = nfs_getcacheblk(vp, lbn, biosize, p);
|
||||
if (!bp)
|
||||
return (EINTR);
|
||||
got_buf = 1;
|
||||
if ((bp->b_flags & (B_DONE | B_DELWRI)) == 0) {
|
||||
bp->b_flags |= B_READ;
|
||||
not_readin = 0;
|
||||
vfs_busy_pages(bp, 0);
|
||||
error = nfs_doio(bp, cred, p);
|
||||
if (error) {
|
||||
brelse(bp);
|
||||
return (error);
|
||||
}
|
||||
bp = nfs_getcacheblk(vp, lbn, biosize, p);
|
||||
if (!bp)
|
||||
return (EINTR);
|
||||
if ((bp->b_flags & B_CACHE) == 0) {
|
||||
bp->b_flags |= B_READ;
|
||||
not_readin = 0;
|
||||
vfs_busy_pages(bp, 0);
|
||||
error = nfs_doio(bp, cred, p);
|
||||
if (error) {
|
||||
brelse(bp);
|
||||
return (error);
|
||||
}
|
||||
}
|
||||
n = min((unsigned)(biosize - on), uio->uio_resid);
|
||||
|
|
@ -259,12 +250,6 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
n = diff;
|
||||
if (not_readin && n > 0) {
|
||||
if (on < bp->b_validoff || (on + n) > bp->b_validend) {
|
||||
if (!got_buf) {
|
||||
bp = nfs_getcacheblk(vp, lbn, biosize, p);
|
||||
if (!bp)
|
||||
return (EINTR);
|
||||
got_buf = 1;
|
||||
}
|
||||
bp->b_flags |= B_NOCACHE;
|
||||
if (bp->b_dirtyend > 0) {
|
||||
if ((bp->b_flags & B_DELWRI) == 0)
|
||||
|
|
@ -286,7 +271,7 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
bp = nfs_getcacheblk(vp, (daddr_t)0, NFS_MAXPATHLEN, p);
|
||||
if (!bp)
|
||||
return (EINTR);
|
||||
if ((bp->b_flags & B_DONE) == 0) {
|
||||
if ((bp->b_flags & B_CACHE) == 0) {
|
||||
bp->b_flags |= B_READ;
|
||||
vfs_busy_pages(bp, 0);
|
||||
error = nfs_doio(bp, cred, p);
|
||||
|
|
@ -297,7 +282,6 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
}
|
||||
}
|
||||
n = min(uio->uio_resid, NFS_MAXPATHLEN - bp->b_resid);
|
||||
got_buf = 1;
|
||||
on = 0;
|
||||
break;
|
||||
case VDIR:
|
||||
|
|
@ -307,7 +291,7 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
if (!bp)
|
||||
return (EINTR);
|
||||
|
||||
if ((bp->b_flags & B_DONE) == 0) {
|
||||
if ((bp->b_flags & B_CACHE) == 0) {
|
||||
bp->b_flags |= B_READ;
|
||||
vfs_busy_pages(bp, 0);
|
||||
error = nfs_doio(bp, cred, p);
|
||||
|
|
@ -329,7 +313,7 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
!incore(vp, rabn)) {
|
||||
rabp = nfs_getcacheblk(vp, rabn, NFS_DIRBLKSIZ, p);
|
||||
if (rabp) {
|
||||
if ((rabp->b_flags & (B_DONE | B_DELWRI)) == 0) {
|
||||
if ((rabp->b_flags & B_CACHE) == 0) {
|
||||
rabp->b_flags |= (B_READ | B_ASYNC);
|
||||
vfs_busy_pages(rabp, 0);
|
||||
if (nfs_asyncio(rabp, cred)) {
|
||||
|
|
@ -344,7 +328,6 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
}
|
||||
on = 0;
|
||||
n = min(uio->uio_resid, NFS_DIRBLKSIZ - bp->b_resid);
|
||||
got_buf = 1;
|
||||
break;
|
||||
default:
|
||||
printf(" nfsbioread: type %x unexpected\n",vp->v_type);
|
||||
|
|
@ -352,9 +335,7 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
};
|
||||
|
||||
if (n > 0) {
|
||||
if (!baddr)
|
||||
baddr = bp->b_data;
|
||||
error = uiomove(baddr + on, (int)n, uio);
|
||||
error = uiomove(bp->b_data + on, (int)n, uio);
|
||||
}
|
||||
switch (vp->v_type) {
|
||||
case VREG:
|
||||
|
|
@ -369,8 +350,7 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
printf(" nfsbioread: type %x unexpected\n",vp->v_type);
|
||||
break;
|
||||
}
|
||||
if (got_buf)
|
||||
brelse(bp);
|
||||
brelse(bp);
|
||||
} while (error == 0 && uio->uio_resid > 0 && n > 0);
|
||||
return (error);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -34,7 +34,7 @@
|
|||
* SUCH DAMAGE.
|
||||
*
|
||||
* @(#)nfs_bio.c 8.5 (Berkeley) 1/4/94
|
||||
* $Id: nfs_bio.c,v 1.10 1995/02/03 03:40:08 davidg Exp $
|
||||
* $Id: nfs_bio.c,v 1.11 1995/03/04 03:24:34 davidg Exp $
|
||||
*/
|
||||
|
||||
#include <sys/param.h>
|
||||
|
|
@ -78,8 +78,7 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
struct proc *p;
|
||||
struct nfsmount *nmp;
|
||||
daddr_t lbn, rabn;
|
||||
caddr_t baddr;
|
||||
int got_buf = 0, nra, error = 0, n = 0, on = 0, not_readin;
|
||||
int nra, error = 0, n = 0, on = 0, not_readin;
|
||||
|
||||
#ifdef lint
|
||||
ioflag = ioflag;
|
||||
|
|
@ -191,7 +190,6 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
};
|
||||
return (error);
|
||||
}
|
||||
baddr = (caddr_t)0;
|
||||
switch (vp->v_type) {
|
||||
case VREG:
|
||||
nfsstats.biocache_reads++;
|
||||
|
|
@ -211,7 +209,7 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
rabp = nfs_getcacheblk(vp, rabn, biosize, p);
|
||||
if (!rabp)
|
||||
return (EINTR);
|
||||
if ((rabp->b_flags & (B_DELWRI | B_DONE)) == 0) {
|
||||
if ((rabp->b_flags & B_DELWRI) == 0) {
|
||||
rabp->b_flags |= (B_READ | B_ASYNC);
|
||||
vfs_busy_pages(rabp, 0);
|
||||
if (nfs_asyncio(rabp, cred)) {
|
||||
|
|
@ -232,25 +230,18 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
* Otherwise, get the block and write back/read in,
|
||||
* as required.
|
||||
*/
|
||||
if ((bp = incore(vp, lbn)) &&
|
||||
(bp->b_flags & (B_BUSY | B_WRITEINPROG)) ==
|
||||
(B_BUSY | B_WRITEINPROG))
|
||||
got_buf = 0;
|
||||
else {
|
||||
again:
|
||||
bp = nfs_getcacheblk(vp, lbn, biosize, p);
|
||||
if (!bp)
|
||||
return (EINTR);
|
||||
got_buf = 1;
|
||||
if ((bp->b_flags & (B_DONE | B_DELWRI)) == 0) {
|
||||
bp->b_flags |= B_READ;
|
||||
not_readin = 0;
|
||||
vfs_busy_pages(bp, 0);
|
||||
error = nfs_doio(bp, cred, p);
|
||||
if (error) {
|
||||
brelse(bp);
|
||||
return (error);
|
||||
}
|
||||
bp = nfs_getcacheblk(vp, lbn, biosize, p);
|
||||
if (!bp)
|
||||
return (EINTR);
|
||||
if ((bp->b_flags & B_CACHE) == 0) {
|
||||
bp->b_flags |= B_READ;
|
||||
not_readin = 0;
|
||||
vfs_busy_pages(bp, 0);
|
||||
error = nfs_doio(bp, cred, p);
|
||||
if (error) {
|
||||
brelse(bp);
|
||||
return (error);
|
||||
}
|
||||
}
|
||||
n = min((unsigned)(biosize - on), uio->uio_resid);
|
||||
|
|
@ -259,12 +250,6 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
n = diff;
|
||||
if (not_readin && n > 0) {
|
||||
if (on < bp->b_validoff || (on + n) > bp->b_validend) {
|
||||
if (!got_buf) {
|
||||
bp = nfs_getcacheblk(vp, lbn, biosize, p);
|
||||
if (!bp)
|
||||
return (EINTR);
|
||||
got_buf = 1;
|
||||
}
|
||||
bp->b_flags |= B_NOCACHE;
|
||||
if (bp->b_dirtyend > 0) {
|
||||
if ((bp->b_flags & B_DELWRI) == 0)
|
||||
|
|
@ -286,7 +271,7 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
bp = nfs_getcacheblk(vp, (daddr_t)0, NFS_MAXPATHLEN, p);
|
||||
if (!bp)
|
||||
return (EINTR);
|
||||
if ((bp->b_flags & B_DONE) == 0) {
|
||||
if ((bp->b_flags & B_CACHE) == 0) {
|
||||
bp->b_flags |= B_READ;
|
||||
vfs_busy_pages(bp, 0);
|
||||
error = nfs_doio(bp, cred, p);
|
||||
|
|
@ -297,7 +282,6 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
}
|
||||
}
|
||||
n = min(uio->uio_resid, NFS_MAXPATHLEN - bp->b_resid);
|
||||
got_buf = 1;
|
||||
on = 0;
|
||||
break;
|
||||
case VDIR:
|
||||
|
|
@ -307,7 +291,7 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
if (!bp)
|
||||
return (EINTR);
|
||||
|
||||
if ((bp->b_flags & B_DONE) == 0) {
|
||||
if ((bp->b_flags & B_CACHE) == 0) {
|
||||
bp->b_flags |= B_READ;
|
||||
vfs_busy_pages(bp, 0);
|
||||
error = nfs_doio(bp, cred, p);
|
||||
|
|
@ -329,7 +313,7 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
!incore(vp, rabn)) {
|
||||
rabp = nfs_getcacheblk(vp, rabn, NFS_DIRBLKSIZ, p);
|
||||
if (rabp) {
|
||||
if ((rabp->b_flags & (B_DONE | B_DELWRI)) == 0) {
|
||||
if ((rabp->b_flags & B_CACHE) == 0) {
|
||||
rabp->b_flags |= (B_READ | B_ASYNC);
|
||||
vfs_busy_pages(rabp, 0);
|
||||
if (nfs_asyncio(rabp, cred)) {
|
||||
|
|
@ -344,7 +328,6 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
}
|
||||
on = 0;
|
||||
n = min(uio->uio_resid, NFS_DIRBLKSIZ - bp->b_resid);
|
||||
got_buf = 1;
|
||||
break;
|
||||
default:
|
||||
printf(" nfsbioread: type %x unexpected\n",vp->v_type);
|
||||
|
|
@ -352,9 +335,7 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
};
|
||||
|
||||
if (n > 0) {
|
||||
if (!baddr)
|
||||
baddr = bp->b_data;
|
||||
error = uiomove(baddr + on, (int)n, uio);
|
||||
error = uiomove(bp->b_data + on, (int)n, uio);
|
||||
}
|
||||
switch (vp->v_type) {
|
||||
case VREG:
|
||||
|
|
@ -369,8 +350,7 @@ nfs_bioread(vp, uio, ioflag, cred)
|
|||
printf(" nfsbioread: type %x unexpected\n",vp->v_type);
|
||||
break;
|
||||
}
|
||||
if (got_buf)
|
||||
brelse(bp);
|
||||
brelse(bp);
|
||||
} while (error == 0 && uio->uio_resid > 0 && n > 0);
|
||||
return (error);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue