gluster代码碎片

inode_table_dump (inode_table_t *itable, char *prefix)
{

        char    key[GF_DUMP_MAX_BUF_LEN];
        int     ret = 0;

        if (!itable)
                return;

        memset(key, 0, sizeof(key));
        ret = pthread_mutex_trylock(&itable->lock);

        if (ret != 0) {
                return;
        }

        gf_proc_dump_build_key(key, prefix, "hashsize");
        gf_proc_dump_write(key, "%d", itable->hashsize);
        gf_proc_dump_build_key(key, prefix, "name");
        gf_proc_dump_write(key, "%s", itable->name);

        gf_proc_dump_build_key(key, prefix, "lru_limit");
        gf_proc_dump_write(key, "%d", itable->lru_limit);
        gf_proc_dump_build_key(key, prefix, "active_size");
        gf_proc_dump_write(key, "%d", itable->active_size);
        gf_proc_dump_build_key(key, prefix, "lru_size");
        gf_proc_dump_write(key, "%d", itable->lru_size);
        gf_proc_dump_build_key(key, prefix, "purge_size");
        gf_proc_dump_write(key, "%d", itable->purge_size);

        INODE_DUMP_LIST(&itable->active, key, prefix, "active");
        INODE_DUMP_LIST(&itable->lru, key, prefix, "lru");
        INODE_DUMP_LIST(&itable->purge, key, prefix, "purge");

        pthread_mutex_unlock(&itable->lock);
}

int
gf_proc_dump_write (char *key, char *value,...)
{
		//调用形式:gf_proc_dump_write("gfid", "%s", uuid_utoa (inode->gfid));
        char         buf[GF_DUMP_MAX_BUF_LEN];//申请一个4096字节的buf
        int          offset = 0;//偏移量offset
        va_list      ap;//参数指针

        GF_ASSERT (key);

        offset = strlen (key);

        memset (buf, 0, GF_DUMP_MAX_BUF_LEN);//缓存区初始化
        snprintf (buf, GF_DUMP_MAX_BUF_LEN, "%s", key);//把gfid以%s的形式打包到buf中去
        snprintf (buf + offset, GF_DUMP_MAX_BUF_LEN - offset, "=");//再打包一个=进去
        offset += 1;//等号=占一位，所以要偏移量要加上一位
        va_start (ap, value);//参数指针指向value。即从value开始
        vsnprintf (buf + offset, GF_DUMP_MAX_BUF_LEN - offset, value, ap);//打包value
        va_end (ap);

        offset = strlen (buf);
        snprintf (buf + offset, GF_DUMP_MAX_BUF_LEN - offset, "\n");
        return write (gf_dump_fd, buf, strlen (buf));
}

 

#define INODE_DUMP_LIST(head, key_buf, key_prefix, list_type)           \
        {                                                               \
                int i = 1;                                              \
                inode_t *inode = NULL;                                  \
                list_for_each_entry (inode, head, list) {               \
                        gf_proc_dump_build_key(key_buf, key_prefix,     \
                                               "%s.%d",list_type, i++); \
                        gf_proc_dump_add_section(key_buf);              \
                        inode_dump(inode, key);                         \
                }                                                       \
        }

inode_dump (inode_t *inode, char *prefix)
{
        int                ret       = -1;
        xlator_t          *xl        = NULL;
        int                i         = 0;
        fd_t              *fd        = NULL;
        struct _inode_ctx *inode_ctx = NULL;
        struct list_head fd_list;

        if (!inode)
                return;

        INIT_LIST_HEAD (&fd_list);

        ret = TRY_LOCK(&inode->lock);
        if (ret != 0) {
                return;
        }

        {
                gf_proc_dump_write("gfid", "%s", uuid_utoa (inode->gfid));
                gf_proc_dump_write("nlookup", "%ld", inode->nlookup);
                gf_proc_dump_write("ref", "%u", inode->ref);
                gf_proc_dump_write("ia_type", "%d", inode->ia_type);
                if (inode->_ctx) {
                        inode_ctx = GF_CALLOC (inode->table->xl->graph->xl_count,
                                               sizeof (*inode_ctx),
                                               gf_common_mt_inode_ctx);
                        if (inode_ctx == NULL) {
                                goto unlock;
                        }

                        for (i = 0; i < inode->table->xl->graph->xl_count; i++) {
                                inode_ctx[i] = inode->_ctx[i];
                        }
                }

		if (dump_options.xl_options.dump_fdctx != _gf_true)
			goto unlock;


                list_for_each_entry (fd, &inode->fd_list, inode_list) {
                        fd_ctx_dump (fd, prefix);
                }
        }
unlock:
        UNLOCK(&inode->lock);

        if (inode_ctx && (dump_options.xl_options.dump_inodectx == _gf_true)) {
                for (i = 0; i < inode->table->xl->graph->xl_count; i++) {
                        if (inode_ctx[i].xl_key) {
                                xl = (xlator_t *)(long)inode_ctx[i].xl_key;
                                if (xl->dumpops && xl->dumpops->inodectx)
                                        xl->dumpops->inodectx (xl, inode);
                        }
                }
        }

        if (inode_ctx != NULL) {
                GF_FREE (inode_ctx);
        }

        return;
}

struct _inode {
        inode_table_t       *table;         /* the table this inode belongs to */
        uuid_t               gfid;
        gf_lock_t            lock;
        uint64_t             nlookup;
        uint32_t             ref;           /* reference count on this inode */
        ia_type_t            ia_type;       /* what kind of file */
        struct list_head     fd_list;       /* list of open files on this inode */
        struct list_head     dentry_list;   /* list of directory entries for this inode */
        struct list_head     hash;          /* hash table pointers */
        struct list_head     list;          /* active/lru/purge */

	struct _inode_ctx   *_ctx;    /* replacement for dict_t *(inode->ctx) */
};