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https://github.com/adulau/aha.git
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resubmit: cciss: procfs updates to display info about many
volumes This patch allows us to display information about all of the logical volumes configured on a particular controller without stepping on memory even when there are many volumes (128 or more) configured. Please consider this for inclusion. Signed-off-by: Mike Miller <mike.miller@hp.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Mike Miller
Jens Axboe
parent
02cf01aea5
commit
89b6e74378
2 changed files with 162 additions and 105 deletions
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@ -33,6 +33,7 @@
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#include <linux/blkpg.h>
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#include <linux/timer.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/init.h>
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#include <linux/hdreg.h>
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#include <linux/spinlock.h>
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@ -174,8 +175,6 @@ static int sendcmd_withirq(__u8 cmd, int ctlr, void *buff, size_t size,
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static void fail_all_cmds(unsigned long ctlr);
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#ifdef CONFIG_PROC_FS
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static int cciss_proc_get_info(char *buffer, char **start, off_t offset,
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int length, int *eof, void *data);
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static void cciss_procinit(int i);
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#else
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static void cciss_procinit(int i)
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@ -240,24 +239,46 @@ static inline CommandList_struct *removeQ(CommandList_struct **Qptr,
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*/
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#define ENG_GIG 1000000000
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#define ENG_GIG_FACTOR (ENG_GIG/512)
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#define ENGAGE_SCSI "engage scsi"
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static const char *raid_label[] = { "0", "4", "1(1+0)", "5", "5+1", "ADG",
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"UNKNOWN"
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};
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static struct proc_dir_entry *proc_cciss;
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static int cciss_proc_get_info(char *buffer, char **start, off_t offset,
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int length, int *eof, void *data)
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static void cciss_seq_show_header(struct seq_file *seq)
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{
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off_t pos = 0;
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off_t len = 0;
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int size, i, ctlr;
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ctlr_info_t *h = (ctlr_info_t *) data;
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drive_info_struct *drv;
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unsigned long flags;
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sector_t vol_sz, vol_sz_frac;
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ctlr_info_t *h = seq->private;
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ctlr = h->ctlr;
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seq_printf(seq, "%s: HP %s Controller\n"
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"Board ID: 0x%08lx\n"
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"Firmware Version: %c%c%c%c\n"
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"IRQ: %d\n"
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"Logical drives: %d\n"
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"Current Q depth: %d\n"
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"Current # commands on controller: %d\n"
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"Max Q depth since init: %d\n"
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"Max # commands on controller since init: %d\n"
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"Max SG entries since init: %d\n",
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h->devname,
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h->product_name,
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(unsigned long)h->board_id,
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h->firm_ver[0], h->firm_ver[1], h->firm_ver[2],
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h->firm_ver[3], (unsigned int)h->intr[SIMPLE_MODE_INT],
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h->num_luns,
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h->Qdepth, h->commands_outstanding,
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h->maxQsinceinit, h->max_outstanding, h->maxSG);
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#ifdef CONFIG_CISS_SCSI_TAPE
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cciss_seq_tape_report(seq, h->ctlr);
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#endif /* CONFIG_CISS_SCSI_TAPE */
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}
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static void *cciss_seq_start(struct seq_file *seq, loff_t *pos)
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{
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ctlr_info_t *h = seq->private;
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unsigned ctlr = h->ctlr;
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unsigned long flags;
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/* prevent displaying bogus info during configuration
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* or deconfiguration of a logical volume
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@ -265,115 +286,155 @@ static int cciss_proc_get_info(char *buffer, char **start, off_t offset,
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spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
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if (h->busy_configuring) {
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spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
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return -EBUSY;
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return ERR_PTR(-EBUSY);
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}
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h->busy_configuring = 1;
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spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
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size = sprintf(buffer, "%s: HP %s Controller\n"
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"Board ID: 0x%08lx\n"
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"Firmware Version: %c%c%c%c\n"
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"IRQ: %d\n"
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"Logical drives: %d\n"
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"Max sectors: %d\n"
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"Current Q depth: %d\n"
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"Current # commands on controller: %d\n"
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"Max Q depth since init: %d\n"
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"Max # commands on controller since init: %d\n"
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"Max SG entries since init: %d\n\n",
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h->devname,
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h->product_name,
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(unsigned long)h->board_id,
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h->firm_ver[0], h->firm_ver[1], h->firm_ver[2],
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h->firm_ver[3], (unsigned int)h->intr[SIMPLE_MODE_INT],
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h->num_luns,
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h->cciss_max_sectors,
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h->Qdepth, h->commands_outstanding,
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h->maxQsinceinit, h->max_outstanding, h->maxSG);
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if (*pos == 0)
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cciss_seq_show_header(seq);
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pos += size;
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len += size;
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cciss_proc_tape_report(ctlr, buffer, &pos, &len);
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for (i = 0; i <= h->highest_lun; i++) {
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drv = &h->drv[i];
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if (drv->heads == 0)
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continue;
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vol_sz = drv->nr_blocks;
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vol_sz_frac = sector_div(vol_sz, ENG_GIG_FACTOR);
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vol_sz_frac *= 100;
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sector_div(vol_sz_frac, ENG_GIG_FACTOR);
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if (drv->raid_level > 5)
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drv->raid_level = RAID_UNKNOWN;
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size = sprintf(buffer + len, "cciss/c%dd%d:"
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"\t%4u.%02uGB\tRAID %s\n",
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ctlr, i, (int)vol_sz, (int)vol_sz_frac,
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raid_label[drv->raid_level]);
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pos += size;
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len += size;
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}
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*eof = 1;
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*start = buffer + offset;
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len -= offset;
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if (len > length)
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len = length;
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h->busy_configuring = 0;
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return len;
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return pos;
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}
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static int
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cciss_proc_write(struct file *file, const char __user *buffer,
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unsigned long count, void *data)
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static int cciss_seq_show(struct seq_file *seq, void *v)
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{
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unsigned char cmd[80];
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int len;
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#ifdef CONFIG_CISS_SCSI_TAPE
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ctlr_info_t *h = (ctlr_info_t *) data;
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int rc;
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sector_t vol_sz, vol_sz_frac;
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ctlr_info_t *h = seq->private;
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unsigned ctlr = h->ctlr;
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loff_t *pos = v;
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drive_info_struct *drv = &h->drv[*pos];
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if (*pos > h->highest_lun)
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return 0;
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if (drv->heads == 0)
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return 0;
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vol_sz = drv->nr_blocks;
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vol_sz_frac = sector_div(vol_sz, ENG_GIG_FACTOR);
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vol_sz_frac *= 100;
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sector_div(vol_sz_frac, ENG_GIG_FACTOR);
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if (drv->raid_level > 5)
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drv->raid_level = RAID_UNKNOWN;
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seq_printf(seq, "cciss/c%dd%d:"
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"\t%4u.%02uGB\tRAID %s\n",
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ctlr, (int) *pos, (int)vol_sz, (int)vol_sz_frac,
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raid_label[drv->raid_level]);
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return 0;
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}
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static void *cciss_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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ctlr_info_t *h = seq->private;
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if (*pos > h->highest_lun)
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return NULL;
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*pos += 1;
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return pos;
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}
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static void cciss_seq_stop(struct seq_file *seq, void *v)
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{
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ctlr_info_t *h = seq->private;
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/* Only reset h->busy_configuring if we succeeded in setting
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* it during cciss_seq_start. */
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if (v == ERR_PTR(-EBUSY))
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return;
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h->busy_configuring = 0;
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}
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static struct seq_operations cciss_seq_ops = {
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.start = cciss_seq_start,
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.show = cciss_seq_show,
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.next = cciss_seq_next,
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.stop = cciss_seq_stop,
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};
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static int cciss_seq_open(struct inode *inode, struct file *file)
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{
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int ret = seq_open(file, &cciss_seq_ops);
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struct seq_file *seq = file->private_data;
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if (!ret)
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seq->private = PDE(inode)->data;
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return ret;
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}
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static ssize_t
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cciss_proc_write(struct file *file, const char __user *buf,
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size_t length, loff_t *ppos)
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{
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int err;
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char *buffer;
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#ifndef CONFIG_CISS_SCSI_TAPE
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return -EINVAL;
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#endif
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if (count > sizeof(cmd) - 1)
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if (!buf || length > PAGE_SIZE - 1)
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return -EINVAL;
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if (copy_from_user(cmd, buffer, count))
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return -EFAULT;
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cmd[count] = '\0';
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len = strlen(cmd); // above 3 lines ensure safety
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if (len && cmd[len - 1] == '\n')
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cmd[--len] = '\0';
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# ifdef CONFIG_CISS_SCSI_TAPE
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if (strcmp("engage scsi", cmd) == 0) {
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buffer = (char *)__get_free_page(GFP_KERNEL);
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if (!buffer)
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return -ENOMEM;
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err = -EFAULT;
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if (copy_from_user(buffer, buf, length))
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goto out;
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buffer[length] = '\0';
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#ifdef CONFIG_CISS_SCSI_TAPE
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if (strncmp(ENGAGE_SCSI, buffer, sizeof ENGAGE_SCSI - 1) == 0) {
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struct seq_file *seq = file->private_data;
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ctlr_info_t *h = seq->private;
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int rc;
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rc = cciss_engage_scsi(h->ctlr);
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if (rc != 0)
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return -rc;
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return count;
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}
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err = -rc;
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else
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err = length;
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} else
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#endif /* CONFIG_CISS_SCSI_TAPE */
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err = -EINVAL;
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/* might be nice to have "disengage" too, but it's not
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safely possible. (only 1 module use count, lock issues.) */
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# endif
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return -EINVAL;
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out:
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free_page((unsigned long)buffer);
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return err;
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}
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/*
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* Get us a file in /proc/cciss that says something about each controller.
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* Create /proc/cciss if it doesn't exist yet.
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*/
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static struct file_operations cciss_proc_fops = {
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.owner = THIS_MODULE,
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.open = cciss_seq_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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.write = cciss_proc_write,
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};
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static void __devinit cciss_procinit(int i)
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{
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struct proc_dir_entry *pde;
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if (proc_cciss == NULL) {
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if (proc_cciss == NULL)
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proc_cciss = proc_mkdir("cciss", proc_root_driver);
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if (!proc_cciss)
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return;
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}
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if (!proc_cciss)
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return;
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pde = proc_create(hba[i]->devname, S_IWUSR | S_IRUSR | S_IRGRP |
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S_IROTH, proc_cciss,
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&cciss_proc_fops);
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if (!pde)
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return;
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pde = create_proc_read_entry(hba[i]->devname,
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S_IWUSR | S_IRUSR | S_IRGRP | S_IROTH,
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proc_cciss, cciss_proc_get_info, hba[i]);
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pde->write_proc = cciss_proc_write;
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pde->data = hba[i];
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}
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#endif /* CONFIG_PROC_FS */
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@ -1404,21 +1404,18 @@ cciss_engage_scsi(int ctlr)
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}
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static void
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cciss_proc_tape_report(int ctlr, unsigned char *buffer, off_t *pos, off_t *len)
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cciss_seq_tape_report(struct seq_file *seq, int ctlr)
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{
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unsigned long flags;
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int size;
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*pos = *pos -1; *len = *len - 1; // cut off the last trailing newline
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CPQ_TAPE_LOCK(ctlr, flags);
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size = sprintf(buffer + *len,
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seq_printf(seq,
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"Sequential access devices: %d\n\n",
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ccissscsi[ctlr].ndevices);
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CPQ_TAPE_UNLOCK(ctlr, flags);
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*pos += size; *len += size;
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}
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/* Need at least one of these error handlers to keep ../scsi/hosts.c from
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* complaining. Doing a host- or bus-reset can't do anything good here.
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* Despite what it might say in scsi_error.c, there may well be commands
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@ -1498,6 +1495,5 @@ static int cciss_eh_abort_handler(struct scsi_cmnd *scsicmd)
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#define cciss_scsi_setup(cntl_num)
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#define cciss_unregister_scsi(ctlr)
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#define cciss_register_scsi(ctlr)
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#define cciss_proc_tape_report(ctlr, buffer, pos, len)
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#endif /* CONFIG_CISS_SCSI_TAPE */
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