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libminixfs: fix buf leak

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. mfs: add asserts to catch similar problems in the future

Change-Id: I939230b8d63f100ac071696425b35496b2169bc4
This commit is contained in:
Ben Gras
2013-11-05 15:43:27 +01:00
parent 075dbe55f3
commit 7d6089f32d
2 changed files with 36 additions and 3 deletions
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9
servers/mfs/read.c
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@@ -297,7 +297,7 @@ int *completed; /* number of bytes copied */
}
/* In all cases, bp now points to a valid buffer. */
assert(bp);
assert(bp != NULL);
if (rw_flag == WRITING && chunk != block_size && !block_spec &&
(off_t) ex64lo(position) >= rip->i_size && off == 0) {
@@ -477,6 +477,7 @@ unsigned bytes_ahead; /* bytes beyond position for immediate use */
static unsigned int readqsize = 0;
static struct buf **read_q;
u64_t position_running;
int inuse_before = lmfs_bufs_in_use();
if(readqsize != nr_bufs) {
if(readqsize > 0) {
@@ -512,6 +513,7 @@ unsigned bytes_ahead; /* bytes beyond position for immediate use */
bp = lmfs_get_block_ino(dev, block, PREFETCH, rip->i_num, position);
assert(bp != NULL);
assert(bp->lmfs_count > 0);
if (lmfs_dev(bp) != NO_DEV) return(bp);
/* The best guess for the number of blocks to prefetch: A lot.
@@ -567,6 +569,7 @@ unsigned bytes_ahead; /* bytes beyond position for immediate use */
/* Acquire block buffers. */
for (;;) {
block_t thisblock;
assert(bp->lmfs_count > 0);
read_q[read_q_size++] = bp;
if (--blocks_ahead == 0) break;
@@ -583,6 +586,8 @@ unsigned bytes_ahead; /* bytes beyond position for immediate use */
} else {
bp = get_block(dev, block, PREFETCH);
}
assert(bp);
assert(bp->lmfs_count > 0);
if (lmfs_dev(bp) != NO_DEV) {
/* Oops, block already in the cache, get out. */
put_block(bp, FULL_DATA_BLOCK);
@@ -591,6 +596,8 @@ unsigned bytes_ahead; /* bytes beyond position for immediate use */
}
lmfs_rw_scattered(dev, read_q, read_q_size, READING);
assert(inuse_before == lmfs_bufs_in_use());
if(block_spec)
return get_block(dev, baseblock, NORMAL);
return(lmfs_get_block_ino(dev, baseblock, NORMAL, rip->i_num, position));