/* bh state bits */ #define BH_Uptodate 0 /* 1 if the buffer contains valid data */ #define BH_Dirty 1 /* 1 if the buffer is dirty */ #define BH_Lock 2 /* 1 if the buffer is locked */ #define BH_Req 3 /* 0 if the buffer has been invalidated */ #define BH_Touched 4 /* 1 if the buffer has been touched (aging) */ #define BH_Has_aged 5 /* 1 if the buffer has been aged (aging) */ #define BH_Protected 6 /* 1 if the buffer is protected */ #define BH_FreeOnIO 7 /* 1 to discard the buffer_head after IO */ struct buffer_head { /* First cache line: */ unsigned long b_blocknr; /* block number */ kdev_t b_dev; /* device (B_FREE = free) */ kdev_t b_rdev; /* Real device */ unsigned long b_rsector; /* Real buffer location on disk */ struct buffer_head *b_next; /* Hash queue list */ struct buffer_head *b_this_page; /* circular list of buffers in one page */ /* Second cache line: */ unsigned long b_state; /* buffer state bitmap (above) */ struct buffer_head *b_next_free; unsigned int b_count; /* users using this block */ unsigned long b_size; /* block size */ /* Non-performance-critical data follows. */ char *b_data; /* pointer to data block */ unsigned int b_list; /* List that this buffer appears */ unsigned long b_flushtime; /* Time when this (dirty) buffer * should be written */ unsigned long b_lru_time; /* Time when this buffer was * last used. */ struct wait_queue *b_wait; struct buffer_head *b_prev; /* doubly linked hash list */ struct buffer_head *b_prev_free; /* doubly linked list of buffers */ struct buffer_head *b_reqnext; /* request queue */ }; device
struct device { /* * This is the first field of the visible part of this structure * (i.e. as seen by users in the Space.c file). It is the name * the interface. */ char *name; /* I/O specific fields */ unsigned long rmem_end; /* shmem recv end */ unsigned long rmem_start; /* shmem recv start */ unsigned long mem_end; /* shared mem end */ unsigned long mem_start; /* shared mem start */ unsigned long base_addr; /* device I/O address */ unsigned char irq; /* device IRQ number */ /* Low-level status flags. */ volatile unsigned char start, /* start an operation */ interrupt; /* interrupt arrived */ unsigned long tbusy; /* transmitter busy */ struct device *next; /* The device initialization function. Called only once. */ int (*init)(struct device *dev); /* Some hardware also needs these fields, but they are not part of the usual set specified in Space.c. */ unsigned char if_port; /* Selectable AUI,TP, */ unsigned char dma; /* DMA channel */ struct enet_statistics* (*get_stats)(struct device *dev); /* * This marks the end of the visible part of the structure. All * fields hereafter are internal to the system, and may change at * will (read: may be cleaned up at will). */ /* These may be needed for future network-power-down code. */ unsigned long trans_start; /* Time (jiffies) of last transmit */ unsigned long last_rx; /* Time of last Rx */ unsigned short flags; /* interface flags (BSD)*/ unsigned short family; /* address family ID */ unsigned short metric; /* routing metric */ unsigned short mtu; /* MTU value */ unsigned short type; /* hardware type */ unsigned short hard_header_len; /* hardware hdr len */ void *priv; /* private data */ /* Interface address info. */ unsigned char broadcast[MAX_ADDR_LEN]; unsigned char pad; unsigned char dev_addr[MAX_ADDR_LEN]; unsigned char addr_len; /* hardware addr len */ unsigned long pa_addr; /* protocol address */ unsigned long pa_brdaddr; /* protocol broadcast addr*/ unsigned long pa_dstaddr; /* protocol P-P other addr*/ unsigned long pa_mask; /* protocol netmask */ unsigned short pa_alen; /* protocol address len */ struct dev_mc_list *mc_list; /* M'cast mac addrs */ int mc_count; /* No installed mcasts */ struct ip_mc_list *ip_mc_list; /* IP m'cast filter chain */ __u32 tx_queue_len; /* Max frames per queue */ /* For load balancing driver pair support */ unsigned long pkt_queue; /* Packets queued */ struct device *slave; /* Slave device */
