xv6-riscv-kernel/kernel/buf.h

struct buf {
  int valid;   // has data been read from disk?
  int disk;    // does disk "own" buf?
  u32 dev;
  u32 blockno;
  struct sleeplock lock;
  u32 refcnt;
  struct buf *prev; // LRU cache list
  struct buf *next;
  u8 data[BSIZE];
};
bread iget mkfs makes a file system image put this in your .bochsrc: ata0-slave: type=disk, mode=flat, path="fs.img", cylinders=1024, heads=1, spt=1 2006-07-21 15:18:04 +02:00			`struct buf {`
Remove B_DIRTY Use refcnt to pin blocks into the cache Replace flags/B_VALID with a boolean field valid Use info[id].status to signal completion of disk interrupt Pass a read/write flag to virtio_disk_rw 2019-07-29 23:33:16 +02:00			`int valid; // has data been read from disk?`
Track in buf if disk "owns" buffer 2019-07-30 18:53:19 +02:00			`int disk; // does disk "own" buf?`
Type names (uint32 -> u32, e.t.c.) 2024-05-24 11:26:40 +02:00			`u32 dev;`
			`u32 blockno;`
Straight replacement of B_BUSY with a sleeping lock. 2016-09-11 23:24:04 +02:00			`struct sleeplock lock;`
Type names (uint32 -> u32, e.t.c.) 2024-05-24 11:26:40 +02:00			`u32 refcnt;`
simplify ide queuing nits in comments 2007-08-24 21:32:36 +02:00			`struct buf *prev; // LRU cache list`
LRU disk cache replacement 2006-08-13 00:34:13 +02:00			`struct buf *next;`
Type names (uint32 -> u32, e.t.c.) 2024-05-24 11:26:40 +02:00			`u8 data[BSIZE];`
bread iget mkfs makes a file system image put this in your .bochsrc: ata0-slave: type=disk, mode=flat, path="fs.img", cylinders=1024, heads=1, spt=1 2006-07-21 15:18:04 +02:00			`};`
Another attempt at the bio.c comment. Rename B_WRITE to B_DIRTY and then let ide.c maintain the B_VALID and B_DIRTY flags. 2007-08-27 16:09:30 +02:00