diff options
Diffstat (limited to 'drivers/scsi/scsi_proc.c')
| -rw-r--r-- | drivers/scsi/scsi_proc.c | 138 |
1 files changed, 84 insertions, 54 deletions
diff --git a/drivers/scsi/scsi_proc.c b/drivers/scsi/scsi_proc.c index c99da926fda..86f0c5d5c11 100644 --- a/drivers/scsi/scsi_proc.c +++ b/drivers/scsi/scsi_proc.c @@ -45,58 +45,51 @@ static struct proc_dir_entry *proc_scsi; /* Protect sht->present and sht->proc_dir */ static DEFINE_MUTEX(global_host_template_mutex); -/** - * proc_scsi_read - handle read from /proc by calling host's proc_info() command - * @buffer: passed to proc_info - * @start: passed to proc_info - * @offset: passed to proc_info - * @length: passed to proc_info - * @eof: returns whether length read was less than requested - * @data: pointer to a &struct Scsi_Host - */ - -static int proc_scsi_read(char *buffer, char **start, off_t offset, - int length, int *eof, void *data) -{ - struct Scsi_Host *shost = data; - int n; - - n = shost->hostt->proc_info(shost, buffer, start, offset, length, 0); - *eof = (n < length); - - return n; -} - -/** - * proc_scsi_write_proc - Handle write to /proc by calling host's proc_info() - * @file: not used - * @buf: source of data to write. - * @count: number of bytes (at most PROC_BLOCK_SIZE) to write. - * @data: pointer to &struct Scsi_Host - */ -static int proc_scsi_write_proc(struct file *file, const char __user *buf, - unsigned long count, void *data) +static ssize_t proc_scsi_host_write(struct file *file, const char __user *buf, + size_t count, loff_t *ppos) { - struct Scsi_Host *shost = data; + struct Scsi_Host *shost = PDE_DATA(file_inode(file)); ssize_t ret = -ENOMEM; char *page; - char *start; if (count > PROC_BLOCK_SIZE) return -EOVERFLOW; + if (!shost->hostt->write_info) + return -EINVAL; + page = (char *)__get_free_page(GFP_KERNEL); if (page) { ret = -EFAULT; if (copy_from_user(page, buf, count)) goto out; - ret = shost->hostt->proc_info(shost, page, &start, 0, count, 1); + ret = shost->hostt->write_info(shost, page, count); } out: free_page((unsigned long)page); return ret; } +static int proc_scsi_show(struct seq_file *m, void *v) +{ + struct Scsi_Host *shost = m->private; + return shost->hostt->show_info(m, shost); +} + +static int proc_scsi_host_open(struct inode *inode, struct file *file) +{ + return single_open_size(file, proc_scsi_show, PDE_DATA(inode), + 4 * PAGE_SIZE); +} + +static const struct file_operations proc_scsi_fops = { + .open = proc_scsi_host_open, + .release = single_release, + .read = seq_read, + .llseek = seq_lseek, + .write = proc_scsi_host_write +}; + /** * scsi_proc_hostdir_add - Create directory in /proc for a scsi host * @sht: owner of this directory @@ -106,7 +99,7 @@ out: void scsi_proc_hostdir_add(struct scsi_host_template *sht) { - if (!sht->proc_info) + if (!sht->show_info) return; mutex_lock(&global_host_template_mutex); @@ -125,7 +118,7 @@ void scsi_proc_hostdir_add(struct scsi_host_template *sht) */ void scsi_proc_hostdir_rm(struct scsi_host_template *sht) { - if (!sht->proc_info) + if (!sht->show_info) return; mutex_lock(&global_host_template_mutex); @@ -151,16 +144,12 @@ void scsi_proc_host_add(struct Scsi_Host *shost) return; sprintf(name,"%d", shost->host_no); - p = create_proc_read_entry(name, S_IFREG | S_IRUGO | S_IWUSR, - sht->proc_dir, proc_scsi_read, shost); - if (!p) { + p = proc_create_data(name, S_IRUGO | S_IWUSR, + sht->proc_dir, &proc_scsi_fops, shost); + if (!p) printk(KERN_ERR "%s: Failed to register host %d in" "%s\n", __func__, shost->host_no, sht->proc_name); - return; - } - - p->write_proc = proc_scsi_write_proc; } /** @@ -381,18 +370,59 @@ static ssize_t proc_scsi_write(struct file *file, const char __user *buf, return err; } -/** - * proc_scsi_show - show contents of /proc/scsi/scsi (attached devices) - * @s: output goes here - * @p: not used - */ -static int proc_scsi_show(struct seq_file *s, void *p) +static int always_match(struct device *dev, void *data) { - seq_printf(s, "Attached devices:\n"); - bus_for_each_dev(&scsi_bus_type, NULL, s, proc_print_scsidevice); - return 0; + return 1; +} + +static inline struct device *next_scsi_device(struct device *start) +{ + struct device *next = bus_find_device(&scsi_bus_type, start, NULL, + always_match); + put_device(start); + return next; } +static void *scsi_seq_start(struct seq_file *sfile, loff_t *pos) +{ + struct device *dev = NULL; + loff_t n = *pos; + + while ((dev = next_scsi_device(dev))) { + if (!n--) + break; + sfile->private++; + } + return dev; +} + +static void *scsi_seq_next(struct seq_file *sfile, void *v, loff_t *pos) +{ + (*pos)++; + sfile->private++; + return next_scsi_device(v); +} + +static void scsi_seq_stop(struct seq_file *sfile, void *v) +{ + put_device(v); +} + +static int scsi_seq_show(struct seq_file *sfile, void *dev) +{ + if (!sfile->private) + seq_puts(sfile, "Attached devices:\n"); + + return proc_print_scsidevice(dev, sfile); +} + +static const struct seq_operations scsi_seq_ops = { + .start = scsi_seq_start, + .next = scsi_seq_next, + .stop = scsi_seq_stop, + .show = scsi_seq_show +}; + /** * proc_scsi_open - glue function * @inode: not used @@ -406,7 +436,7 @@ static int proc_scsi_open(struct inode *inode, struct file *file) * We don't really need this for the write case but it doesn't * harm either. */ - return single_open(file, proc_scsi_show, NULL); + return seq_open(file, &scsi_seq_ops); } static const struct file_operations proc_scsi_operations = { @@ -415,7 +445,7 @@ static const struct file_operations proc_scsi_operations = { .read = seq_read, .write = proc_scsi_write, .llseek = seq_lseek, - .release = single_release, + .release = seq_release, }; /** |