Imbus/xv6-riscv-kernel
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fix buf where concurrent fs syscalls race on log entries

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This commit is contained in:
Cody Cutler 2015-02-19 11:51:47 -05:00
parent 41f16c2183
commit 3d2dedd427
1 changed files with 2 additions and 0 deletions
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2
log.c
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@ -217,6 +217,7 @@ log_write(struct buf *b)
if (log.outstanding < 1) if (log.outstanding < 1)
panic("log_write outside of trans"); panic("log_write outside of trans");
acquire(&log.lock);
for (i = 0; i < log.lh.n; i++) { for (i = 0; i < log.lh.n; i++) {
if (log.lh.sector[i] == b->sector) // log absorbtion if (log.lh.sector[i] == b->sector) // log absorbtion
break; break;
@ -225,5 +226,6 @@ log_write(struct buf *b)
if (i == log.lh.n) if (i == log.lh.n)
log.lh.n++; log.lh.n++;
b->flags |= B_DIRTY; // prevent eviction b->flags |= B_DIRTY; // prevent eviction
release(&log.lock);
} }