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-rw-r--r--bio.c2
-rw-r--r--fs.c2
-rw-r--r--log.c4
3 files changed, 5 insertions, 3 deletions
diff --git a/bio.c b/bio.c
index a61ff72..a45ff3e 100644
--- a/bio.c
+++ b/bio.c
@@ -99,7 +99,7 @@ bread(uint dev, uint blockno)
struct buf *b;
b = bget(dev, blockno);
- if(!(b->flags & B_VALID)) {
+ if((b->flags & B_VALID) == 0) {
iderw(b);
}
return b;
diff --git a/fs.c b/fs.c
index 8fb09ef..1ada466 100644
--- a/fs.c
+++ b/fs.c
@@ -190,7 +190,7 @@ static struct inode* iget(uint dev, uint inum);
//PAGEBREAK!
// Allocate an inode on device dev.
-// Give it type type.
+// Mark it as allocated by giving it type type.
// Returns an unlocked but allocated and referenced inode.
struct inode*
ialloc(uint dev, short type)
diff --git a/log.c b/log.c
index 9ba3ced..a64c0f6 100644
--- a/log.c
+++ b/log.c
@@ -155,7 +155,9 @@ end_op(void)
do_commit = 1;
log.committing = 1;
} else {
- // begin_op() may be waiting for log space.
+ // begin_op() may be waiting for log space,
+ // and decrementing log.outstanding has decreased
+ // the amount of reserved space.
wakeup(&log);
}
release(&log.lock);