Hi,
The buffer_head structure in fs.h dont use list_head,
but normal doubly linked list implementation,
is there any reason behind this.
struct buffer_head {
/* First cache line: */
struct buffer_head *b_next; /* Hash queue
list */
unsigned long b_blocknr; /* block
number */
unsigned short b_size; /* block size
*/
unsigned short b_list; /* List that
this buffer appears */
kdev_t b_dev; /* device
(B_FREE = free) */
atomic_t b_count; /* users using
this block */
kdev_t b_rdev; /* Real device
*/
unsigned long b_state; /* buffer
state bitmap (see above) */
unsigned long b_flushtime; /* Time when
(dirty) buffer should be written */
struct buffer_head *b_next_free;/* lru/free
list linkage */
struct buffer_head *b_prev_free;/* doubly
linked list of buffers */
struct buffer_head *b_this_page;/* circular
list of buffers in one page */
struct buffer_head *b_reqnext; /* request
queue */
struct buffer_head **b_pprev; /* doubly
linked list of hash-queue */
char * b_data; /* pointer to
data block */
struct page *b_page; /* the page
this bh is mapped to */
void (*b_end_io)(struct buffer_head *bh, int
uptodate); /* I/O completion */
void *b_private; /* reserved
for b_end_io */
unsigned long b_rsector; /* Real buffer
location on disk */
wait_queue_head_t b_wait;
struct list_head b_inode_buffers; /*
doubly linked list of inode dirty buffers */
};
Thanks
Prasanna
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