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Re-institute a bugfix in allocation of anonymous buffer memory.

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This commit is contained in:
John Dyson 1997-09-21 04:49:30 +00:00
parent 99448ed11d
commit 804cd17e21
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=29654
1 changed files with 36 additions and 7 deletions
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43
sys/kern/vfs_bio.c
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@ -18,7 +18,7 @@
* 5. Modifications may be freely made to this file if the above conditions
* are met.
*
* $Id: vfs_bio.c,v 1.125 1997/09/07 16:56:29 bde Exp $
* $Id: vfs_bio.c,v 1.126 1997/09/10 20:09:22 phk Exp $
*/
/*
@ -1786,11 +1786,26 @@ biodone(register struct buf * bp)
int iosize;
struct vnode *vp = bp->b_vp;
obj = vp->v_object;
#if defined(VFS_BIO_DEBUG)
if (vp->v_usecount == 0) {
panic("biodone: zero vnode ref count");
}
if (vp->v_object == NULL) {
panic("biodone: missing VM object");
}
if ((vp->v_flag & VVMIO) == 0) {
panic("biodone: vnode is not setup for merged cache");
}
#endif
if (vp->v_type == VBLK)
foff = (vm_ooffset_t) DEV_BSIZE * bp->b_lblkno;
else
foff = (vm_ooffset_t) vp->v_mount->mnt_stat.f_iosize * bp->b_lblkno;
obj = vp->v_object;
#if !defined(MAX_PERF)
if (!obj) {
panic("biodone: no object");
@ -2188,7 +2203,8 @@ vm_hold_load_pages(struct buf * bp, vm_offset_t from, vm_offset_t to)
tryagain:
p = vm_page_alloc(kernel_object, ((pg - VM_MIN_KERNEL_ADDRESS) >> PAGE_SHIFT),
p = vm_page_alloc(kernel_object,
((pg - VM_MIN_KERNEL_ADDRESS) >> PAGE_SHIFT),
VM_ALLOC_NORMAL);
if (!p) {
VM_WAIT;
@ -2199,7 +2215,7 @@ vm_hold_load_pages(struct buf * bp, vm_offset_t from, vm_offset_t to)
bp->b_pages[index] = p;
PAGE_WAKEUP(p);
}
bp->b_npages = to >> PAGE_SHIFT;
bp->b_npages = index;
}
void
@ -2207,11 +2223,11 @@ vm_hold_free_pages(struct buf * bp, vm_offset_t from, vm_offset_t to)
{
vm_offset_t pg;
vm_page_t p;
int index;
int index, newnpages;
from = round_page(from);
to = round_page(to);
index = (from - trunc_page(bp->b_data)) >> PAGE_SHIFT;
newnpages = index = (from - trunc_page(bp->b_data)) >> PAGE_SHIFT;
for (pg = from; pg < to; pg += PAGE_SIZE, index++) {
p = bp->b_pages[index];
@ -2228,7 +2244,7 @@ vm_hold_free_pages(struct buf * bp, vm_offset_t from, vm_offset_t to)
vm_page_free(p);
}
}
bp->b_npages = from >> PAGE_SHIFT;
bp->b_npages = newnpages;
}
@ -2257,5 +2273,18 @@ DB_SHOW_COMMAND(buffer, db_show_buffer)
"b_blkno = %d, b_pblkno = %d\n",
bp->b_error, bp->b_bufsize, bp->b_bcount, bp->b_resid,
bp->b_dev, bp->b_un.b_addr, bp->b_blkno, bp->b_pblkno);
if (bp->b_npages) {
int i;
db_printf("b_npages = %d, pages(OBJ, IDX, PA): ", bp->b_npages);
for (i = 0; i < bp->b_npages; i++) {
vm_page_t m;
m = bp->b_pages[i];
db_printf("(0x%x, 0x%x, 0x%x)", m->object, m->pindex,
VM_PAGE_TO_PHYS(m));
if ((i + 1) < bp->b_npages)
db_printf(",");
}
db_printf("\n");
}
}
#endif /* DDB */