diff options
Diffstat (limited to 'src/cmd/venti/srv/dcache.c')
| -rw-r--r-- | src/cmd/venti/srv/dcache.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/src/cmd/venti/srv/dcache.c b/src/cmd/venti/srv/dcache.c index a50ef0c5..f4f00898 100644 --- a/src/cmd/venti/srv/dcache.c +++ b/src/cmd/venti/srv/dcache.c @@ -1,23 +1,23 @@ /* * Disk cache. - * + * * Caches raw disk blocks. Getdblock() gets a block, putdblock puts it back. * Getdblock has a mode parameter that determines i/o and access to a block: * if mode is OREAD or ORDWR, it is read from disk if not already in memory. * If mode is ORDWR or OWRITE, it is locked for exclusive use before being returned. * It is *not* marked dirty -- once changes have been made, they should be noted - * by using dirtydblock() before putdblock(). + * by using dirtydblock() before putdblock(). * - * There is a global cache lock as well as a lock on each block. + * There is a global cache lock as well as a lock on each block. * Within a thread, the cache lock can be acquired while holding a block lock, * but not vice versa; and a block cannot be locked if you already hold the lock * on another block. - * + * * The flush proc writes out dirty blocks in batches, one batch per dirty tag. * For example, the DirtyArena blocks are all written to disk before any of the * DirtyArenaCib blocks. * - * This code used to be in charge of flushing the dirty index blocks out to + * This code used to be in charge of flushing the dirty index blocks out to * disk, but updating the index turned out to benefit from extra care. * Now cached index blocks are never marked dirty. The index.c code takes * care of updating them behind our back, and uses _getdblock to update any @@ -134,7 +134,7 @@ DBlock* getdblock(Part *part, u64int addr, int mode) { DBlock *b; - + b = _getdblock(part, addr, mode, 1); if(mode == OREAD || mode == ORDWR) addstat(StatDcacheRead, 1); @@ -335,7 +335,7 @@ static void unchain(DBlock *b) { ulong h; - + /* * unchain the block */ @@ -395,7 +395,7 @@ void emptydcache(void) { DBlock *b; - + qlock(&dcache.lock); while(dcache.nheap > 0){ b = dcache.heap[0]; @@ -575,7 +575,7 @@ parallelwrites(DBlock **b, DBlock **eb, int dirty) assert(b<=p && p<eb); recvp((*p)->writedonechan); } - + /* * Flush the partitions that have been written to. */ |