xv6-cs450/buf.h

struct buf {
  int flags;
  uint dev;
  uint sector;
  struct buf *prev; // LRU cache list
  struct buf *next;
  struct buf *qnext; // disk queue
  int done;
  uchar data[512];
};
#define B_BUSY 0x1  // buffer is locked by some process
#define B_VALID 0x2 // buffer contains the data of the sector
#define B_WRITE 0x4 // asking device driver to write, else read
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 {`
			`int flags;`
fix getblk to actually lock the block no more cons_put system calls usertests tests two processes writing files 2006-08-12 13:38:57 +02:00			`uint dev;`
			`uint sector;`
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;`
simplify ide queuing nits in comments 2007-08-24 21:32:36 +02:00			`struct buf *qnext; // disk queue`
			`int done;`
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			`uchar data[512];`
			`};`
some comment changes 2006-09-08 16:36:44 +02:00			`#define B_BUSY 0x1 // buffer is locked by some process`
			`#define B_VALID 0x2 // buffer contains the data of the sector`
simplify ide queuing nits in comments 2007-08-24 21:32:36 +02:00			`#define B_WRITE 0x4 // asking device driver to write, else read`