xv6-65oo2/buf.h

struct buf {
  int flags;
  uint dev;
  uint blockno;
  struct buf *prev; // LRU cache list
  struct buf *next;
  struct buf *qnext; // disk queue
  uchar data[BSIZE];
};
#define B_BUSY  0x1  // buffer is locked by some process
#define B_VALID 0x2  // buffer has been read from disk
#define B_DIRTY 0x4  // buffer needs to be written to disk
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 13:18:04 +00:00			`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 11:38:57 +00:00			`uint dev;`
Disentangle block size from the disk's sector size. Set block size to 1024 to show that they can be different. Clean up mkfs, simplifying specifying fs parameters, remove some redundancy between fs and mkfs, and fix disk layout bugs. Call blocks in the file system blocks instead of sectors. Passes usertests for different block sizes. 2015-04-03 12:22:02 +00:00			`uint blockno;`
simplify ide queuing nits in comments 2007-08-24 19:32:36 +00:00			`struct buf *prev; // LRU cache list`
LRU disk cache replacement 2006-08-12 22:34:13 +00:00			`struct buf *next;`
simplify ide queuing nits in comments 2007-08-24 19:32:36 +00:00			`struct buf *qnext; // disk queue`
Disentangle block size from the disk's sector size. Set block size to 1024 to show that they can be different. Clean up mkfs, simplifying specifying fs parameters, remove some redundancy between fs and mkfs, and fix disk layout bugs. Call blocks in the file system blocks instead of sectors. Passes usertests for different block sizes. 2015-04-03 12:22:02 +00:00			`uchar 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 13:18:04 +00:00			`};`
Revert "Introduce and use sleeplocks instead of BUSY flags" My changes have a race with re-used bufs and the code doesn't seem to get shorter Keep the changes that fixed ip->off race This reverts commit 3a5fa7ed9020eaf8ab843a16d26db7393b2ec072. Conflicts: defs.h file.c file.h 2011-08-29 21:18:40 +00:00			`#define B_BUSY 0x1 // buffer is locked by some process`
			`#define B_VALID 0x2 // buffer has been read from disk`
			`#define B_DIRTY 0x4 // buffer needs to be written to disk`
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 14:09:30 +00:00