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- Lock access to the buffer_map with the vm_map lock. In 4.x this was

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done with splbio, in 5.x this was done with Giant.

Discussed with:		alc
Reported by:		julian, pho
This commit is contained in:
jeff 2005-03-08 09:34:54 +00:00
parent 9035551aae
commit 893b010525
1 changed files with 5 additions and 0 deletions
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5
sys/kern/vfs_bio.c
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@ -624,10 +624,12 @@ bfreekva(struct buf *bp)
if (bp->b_kvasize) {
atomic_add_int(&buffreekvacnt, 1);
atomic_subtract_int(&bufspace, bp->b_kvasize);
vm_map_lock(buffer_map);
vm_map_delete(buffer_map,
(vm_offset_t) bp->b_kvabase,
(vm_offset_t) bp->b_kvabase + bp->b_kvasize
);
vm_map_unlock(buffer_map);
bp->b_kvasize = 0;
bufspacewakeup();
}
@ -1928,6 +1930,7 @@ restart:
bfreekva(bp);
vm_map_lock(buffer_map);
if (vm_map_findspace(buffer_map,
vm_map_min(buffer_map), maxsize, &addr)) {
/*
@ -1935,6 +1938,7 @@ restart:
* must defragment the map.
*/
atomic_add_int(&bufdefragcnt, 1);
vm_map_unlock(buffer_map);
defrag = 1;
bp->b_flags |= B_INVAL;
brelse(bp);
@ -1950,6 +1954,7 @@ restart:
atomic_add_int(&bufspace, bp->b_kvasize);
atomic_add_int(&bufreusecnt, 1);
}
vm_map_unlock(buffer_map);
}
bp->b_saveaddr = bp->b_kvabase;
bp->b_data = bp->b_saveaddr;