1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (C) 2002 Cluster File Systems, Inc.
6 * This file is part of Lustre, http://www.lustre.org.
8 * Lustre is free software; you can redistribute it and/or
9 * modify it under the terms of version 2 of the GNU General Public
10 * License as published by the Free Software Foundation.
12 * Lustre is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Lustre; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #define DEBUG_SUBSYSTEM S_LLITE
24 #include <linux/version.h>
25 #include <linux/lustre_lite.h>
26 #include <linux/lprocfs_status.h>
27 #include <linux/seq_file.h>
28 #include <linux/obd_support.h>
30 #include "llite_internal.h"
32 struct proc_dir_entry *proc_lustre_fs_root;
35 /* /proc/lustre/llite mount point registration */
36 struct file_operations llite_dump_pgcache_fops;
37 struct file_operations ll_ra_stats_fops;
39 long long mnt_instance;
41 static int ll_rd_blksize(char *page, char **start, off_t off, int count,
44 struct super_block *sb = (struct super_block *)data;
45 struct obd_statfs osfs;
49 rc = ll_statfs_internal(sb, &osfs, jiffies - HZ);
52 rc = snprintf(page, count, "%u\n", osfs.os_bsize);
58 static int ll_rd_kbytestotal(char *page, char **start, off_t off, int count,
61 struct super_block *sb = (struct super_block *)data;
62 struct obd_statfs osfs;
66 rc = ll_statfs_internal(sb, &osfs, jiffies - HZ);
68 __u32 blk_size = osfs.os_bsize >> 10;
69 __u64 result = osfs.os_blocks;
71 while (blk_size >>= 1)
75 rc = snprintf(page, count, LPU64"\n", result);
81 static int ll_rd_kbytesfree(char *page, char **start, off_t off, int count,
84 struct super_block *sb = (struct super_block *)data;
85 struct obd_statfs osfs;
89 rc = ll_statfs_internal(sb, &osfs, jiffies - HZ);
91 __u32 blk_size = osfs.os_bsize >> 10;
92 __u64 result = osfs.os_bfree;
94 while (blk_size >>= 1)
98 rc = snprintf(page, count, LPU64"\n", result);
103 static int ll_rd_kbytesavail(char *page, char **start, off_t off, int count,
104 int *eof, void *data)
106 struct super_block *sb = (struct super_block *)data;
107 struct obd_statfs osfs;
111 rc = ll_statfs_internal(sb, &osfs, jiffies - HZ);
113 __u32 blk_size = osfs.os_bsize >> 10;
114 __u64 result = osfs.os_bavail;
116 while (blk_size >>= 1)
120 rc = snprintf(page, count, LPU64"\n", result);
125 static int ll_rd_filestotal(char *page, char **start, off_t off, int count,
126 int *eof, void *data)
128 struct super_block *sb = (struct super_block *)data;
129 struct obd_statfs osfs;
133 rc = ll_statfs_internal(sb, &osfs, jiffies - HZ);
136 rc = snprintf(page, count, LPU64"\n", osfs.os_files);
141 static int ll_rd_filesfree(char *page, char **start, off_t off, int count,
142 int *eof, void *data)
144 struct super_block *sb = (struct super_block *)data;
145 struct obd_statfs osfs;
149 rc = ll_statfs_internal(sb, &osfs, jiffies - HZ);
152 rc = snprintf(page, count, LPU64"\n", osfs.os_ffree);
158 static int ll_rd_fstype(char *page, char **start, off_t off, int count,
159 int *eof, void *data)
161 struct super_block *sb = (struct super_block*)data;
165 return snprintf(page, count, "%s\n", sb->s_type->name);
168 static int ll_rd_sb_uuid(char *page, char **start, off_t off, int count,
169 int *eof, void *data)
171 struct super_block *sb = (struct super_block *)data;
175 return snprintf(page, count, "%s\n", ll_s2sbi(sb)->ll_sb_uuid.uuid);
178 static int ll_rd_max_readahead_mb(char *page, char **start, off_t off,
179 int count, int *eof, void *data)
181 struct super_block *sb = data;
182 struct ll_sb_info *sbi = ll_s2sbi(sb);
185 spin_lock(&sbi->ll_lock);
186 val = sbi->ll_ra_info.ra_max_pages >> (20 - PAGE_CACHE_SHIFT);
187 spin_unlock(&sbi->ll_lock);
189 return snprintf(page, count, "%u\n", val);
192 static int ll_wr_max_readahead_mb(struct file *file, const char *buffer,
193 unsigned long count, void *data)
195 struct super_block *sb = data;
196 struct ll_sb_info *sbi = ll_s2sbi(sb);
199 rc = lprocfs_write_helper(buffer, count, &val);
203 if (val < 0 || val > (num_physpages >> (20 - PAGE_CACHE_SHIFT - 1))) {
204 CERROR("can't set readahead more than %lu MB\n",
205 num_physpages >> (20 - PAGE_CACHE_SHIFT - 1));
209 spin_lock(&sbi->ll_lock);
210 sbi->ll_ra_info.ra_max_pages = val << (20 - PAGE_CACHE_SHIFT);
211 spin_unlock(&sbi->ll_lock);
216 static int ll_rd_max_cached_mb(char *page, char **start, off_t off,
217 int count, int *eof, void *data)
219 struct super_block *sb = data;
220 struct ll_sb_info *sbi = ll_s2sbi(sb);
223 spin_lock(&sbi->ll_lock);
224 val = sbi->ll_async_page_max >> (20 - PAGE_CACHE_SHIFT);
225 spin_unlock(&sbi->ll_lock);
227 return snprintf(page, count, "%u\n", val);
230 static int ll_wr_max_cached_mb(struct file *file, const char *buffer,
231 unsigned long count, void *data)
233 struct super_block *sb = data;
234 struct ll_sb_info *sbi = ll_s2sbi(sb);
237 rc = lprocfs_write_helper(buffer, count, &val);
241 if (val < 0 || val > (num_physpages >> (20 - PAGE_CACHE_SHIFT))) {
242 CERROR("can't set max cache more than %lu MB\n",
243 num_physpages >> (20 - PAGE_CACHE_SHIFT));
247 spin_lock(&sbi->ll_lock);
248 sbi->ll_async_page_max = val << (20 - PAGE_CACHE_SHIFT);
249 spin_unlock(&sbi->ll_lock);
251 if (sbi->ll_async_page_count >= sbi->ll_async_page_max)
252 llap_shrink_cache(sbi, 0);
257 static int ll_rd_checksum(char *page, char **start, off_t off,
258 int count, int *eof, void *data)
260 struct super_block *sb = data;
261 struct ll_sb_info *sbi = ll_s2sbi(sb);
263 return snprintf(page, count, "%u\n",
264 (sbi->ll_flags & LL_SBI_CHECKSUM) ? 1 : 0);
267 static int ll_wr_checksum(struct file *file, const char *buffer,
268 unsigned long count, void *data)
270 struct super_block *sb = data;
271 struct ll_sb_info *sbi = ll_s2sbi(sb);
274 rc = lprocfs_write_helper(buffer, count, &val);
279 sbi->ll_flags |= LL_SBI_CHECKSUM;
281 sbi->ll_flags &= ~LL_SBI_CHECKSUM;
283 rc = obd_set_info(sbi->ll_osc_exp, strlen("checksum"), "checksum",
286 CWARN("Failed to set OSC checksum flags: %d\n", rc);
291 static struct lprocfs_vars lprocfs_obd_vars[] = {
292 { "uuid", ll_rd_sb_uuid, 0, 0 },
293 //{ "mntpt_path", ll_rd_path, 0, 0 },
294 { "fstype", ll_rd_fstype, 0, 0 },
295 { "blocksize", ll_rd_blksize, 0, 0 },
296 { "kbytestotal", ll_rd_kbytestotal, 0, 0 },
297 { "kbytesfree", ll_rd_kbytesfree, 0, 0 },
298 { "kbytesavail", ll_rd_kbytesavail, 0, 0 },
299 { "filestotal", ll_rd_filestotal, 0, 0 },
300 { "filesfree", ll_rd_filesfree, 0, 0 },
301 //{ "filegroups", lprocfs_rd_filegroups, 0, 0 },
302 { "max_read_ahead_mb", ll_rd_max_readahead_mb,
303 ll_wr_max_readahead_mb, 0 },
304 { "max_cached_mb", ll_rd_max_cached_mb, ll_wr_max_cached_mb, 0 },
305 { "checksum_pages", ll_rd_checksum, ll_wr_checksum, 0 },
309 #define MAX_STRING_SIZE 128
311 struct llite_file_opcode {
315 } llite_opcode_table[LPROC_LL_FILE_OPCODES] = {
317 { LPROC_LL_DIRTY_HITS, LPROCFS_TYPE_REGS, "dirty_pages_hits" },
318 { LPROC_LL_DIRTY_MISSES, LPROCFS_TYPE_REGS, "dirty_pages_misses" },
319 { LPROC_LL_WB_WRITEPAGE, LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
320 "writeback_from_writepage" },
321 { LPROC_LL_WB_PRESSURE, LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
322 "writeback_from_pressure" },
323 { LPROC_LL_WB_OK, LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
324 "writeback_ok_pages" },
325 { LPROC_LL_WB_FAIL, LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
326 "writeback_failed_pages" },
327 { LPROC_LL_READ_BYTES, LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
329 { LPROC_LL_WRITE_BYTES, LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_BYTES,
331 { LPROC_LL_BRW_READ, LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
333 { LPROC_LL_BRW_WRITE, LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
336 { LPROC_LL_IOCTL, LPROCFS_TYPE_REGS, "ioctl" },
337 { LPROC_LL_OPEN, LPROCFS_TYPE_REGS, "open" },
338 { LPROC_LL_RELEASE, LPROCFS_TYPE_REGS, "close" },
339 { LPROC_LL_MAP, LPROCFS_TYPE_REGS, "mmap" },
340 { LPROC_LL_LLSEEK, LPROCFS_TYPE_REGS, "seek" },
341 { LPROC_LL_FSYNC, LPROCFS_TYPE_REGS, "fsync" },
342 /* inode operation */
343 { LPROC_LL_SETATTR, LPROCFS_TYPE_REGS, "setattr" },
344 { LPROC_LL_TRUNC, LPROCFS_TYPE_REGS, "punch" },
345 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
346 { LPROC_LL_GETATTR, LPROCFS_TYPE_REGS, "getattr" },
348 { LPROC_LL_REVALIDATE, LPROCFS_TYPE_REGS, "getattr" },
350 /* special inode operation */
351 { LPROC_LL_STAFS, LPROCFS_TYPE_REGS, "statfs" },
352 { LPROC_LL_ALLOC_INODE, LPROCFS_TYPE_REGS, "alloc_inode" },
353 { LPROC_LL_DIRECT_READ, LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
355 { LPROC_LL_DIRECT_WRITE, LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
360 int lprocfs_register_mountpoint(struct proc_dir_entry *parent,
361 struct super_block *sb, char *osc, char *mdc)
363 struct lprocfs_vars lvars[2];
364 struct ll_sb_info *sbi = ll_s2sbi(sb);
365 struct obd_device *obd;
366 char name[MAX_STRING_SIZE + 1];
368 struct lprocfs_stats *svc_stats = NULL;
369 struct proc_dir_entry *entry;
372 memset(lvars, 0, sizeof(lvars));
374 name[MAX_STRING_SIZE] = '\0';
375 lvars[0].name = name;
377 LASSERT(sbi != NULL);
378 LASSERT(mdc != NULL);
379 LASSERT(osc != NULL);
382 snprintf(name, MAX_STRING_SIZE, "fs%llu", mnt_instance);
385 sbi->ll_proc_root = lprocfs_register(name, parent, NULL, NULL);
386 if (IS_ERR(sbi->ll_proc_root)) {
387 err = PTR_ERR(sbi->ll_proc_root);
388 sbi->ll_proc_root = NULL;
392 entry = create_proc_entry("dump_page_cache", 0444, sbi->ll_proc_root);
394 GOTO(out, err = -ENOMEM);
395 entry->proc_fops = &llite_dump_pgcache_fops;
398 entry = create_proc_entry("read_ahead_stats", 0444, sbi->ll_proc_root);
400 GOTO(out, err = -ENOMEM);
401 entry->proc_fops = &ll_ra_stats_fops;
404 svc_stats = lprocfs_alloc_stats(LPROC_LL_FILE_OPCODES);
405 if (svc_stats == NULL) {
409 /* do counter init */
410 for (id = 0; id < LPROC_LL_FILE_OPCODES; id++) {
411 __u32 type = llite_opcode_table[id].type;
413 if (type & LPROCFS_TYPE_REGS)
416 if (type & LPROCFS_TYPE_BYTES)
419 if (type & LPROCFS_TYPE_PAGES)
423 lprocfs_counter_init(svc_stats, llite_opcode_table[id].opcode,
424 (type & LPROCFS_CNTR_AVGMINMAX),
425 llite_opcode_table[id].opname, ptr);
427 err = lprocfs_register_stats(sbi->ll_proc_root, "stats", svc_stats);
431 sbi->ll_stats = svc_stats;
432 /* need place to keep svc_stats */
434 /* Static configuration info */
435 err = lprocfs_add_vars(sbi->ll_proc_root, lprocfs_obd_vars, sb);
440 obd = class_name2obd(mdc);
442 LASSERT(obd != NULL);
443 LASSERT(obd->obd_type != NULL);
444 LASSERT(obd->obd_type->typ_name != NULL);
446 snprintf(name, MAX_STRING_SIZE, "%s/common_name",
447 obd->obd_type->typ_name);
448 lvars[0].read_fptr = lprocfs_rd_name;
449 err = lprocfs_add_vars(sbi->ll_proc_root, lvars, obd);
453 snprintf(name, MAX_STRING_SIZE, "%s/uuid", obd->obd_type->typ_name);
454 lvars[0].read_fptr = lprocfs_rd_uuid;
455 err = lprocfs_add_vars(sbi->ll_proc_root, lvars, obd);
460 obd = class_name2obd(osc);
462 LASSERT(obd != NULL);
463 LASSERT(obd->obd_type != NULL);
464 LASSERT(obd->obd_type->typ_name != NULL);
466 snprintf(name, MAX_STRING_SIZE, "%s/common_name",
467 obd->obd_type->typ_name);
468 lvars[0].read_fptr = lprocfs_rd_name;
469 err = lprocfs_add_vars(sbi->ll_proc_root, lvars, obd);
473 snprintf(name, MAX_STRING_SIZE, "%s/uuid", obd->obd_type->typ_name);
474 lvars[0].read_fptr = lprocfs_rd_uuid;
475 err = lprocfs_add_vars(sbi->ll_proc_root, lvars, obd);
479 lprocfs_free_stats(svc_stats);
480 if (sbi->ll_proc_root)
481 lprocfs_remove(sbi->ll_proc_root);
486 void lprocfs_unregister_mountpoint(struct ll_sb_info *sbi)
488 if (sbi->ll_proc_root) {
489 struct proc_dir_entry *file_stats =
490 lprocfs_srch(sbi->ll_proc_root, "stats");
493 lprocfs_free_stats(sbi->ll_stats);
494 lprocfs_remove(file_stats);
498 #undef MAX_STRING_SIZE
500 #define seq_page_flag(seq, page, flag, has_flags) do { \
501 if (test_bit(PG_##flag, &(page)->flags)) { \
505 seq_putc(seq, '|'); \
506 seq_puts(seq, #flag); \
510 static void *llite_dump_pgcache_seq_start(struct seq_file *seq, loff_t *pos)
512 struct ll_async_page *dummy_llap = seq->private;
514 if (dummy_llap->llap_magic == 2)
520 static int llite_dump_pgcache_seq_show(struct seq_file *seq, void *v)
522 struct ll_async_page *llap, *dummy_llap = seq->private;
523 struct ll_sb_info *sbi = dummy_llap->llap_cookie;
525 /* 2.4 doesn't seem to have SEQ_START_TOKEN, so we implement
526 * it in our own state */
527 if (dummy_llap->llap_magic == 0) {
528 seq_printf(seq, "gener | llap cookie origin wq du | page "
529 "inode index count [ page flags ]\n");
533 spin_lock(&sbi->ll_lock);
535 llap = llite_pglist_next_llap(sbi, &dummy_llap->llap_pglist_item);
538 struct page *page = llap->llap_page;
540 LASSERTF(llap->llap_origin < LLAP__ORIGIN_MAX, "%u\n",
543 seq_printf(seq, "%5lu | %p %p %s %s %s | %p %p %lu %u [",
545 llap, llap->llap_cookie,
546 llap_origins[llap->llap_origin],
547 llap->llap_write_queued ? "wq" : "- ",
548 llap->llap_defer_uptodate ? "du" : "- ",
549 page, page->mapping->host, page->index,
551 seq_page_flag(seq, page, locked, has_flags);
552 seq_page_flag(seq, page, error, has_flags);
553 seq_page_flag(seq, page, referenced, has_flags);
554 seq_page_flag(seq, page, uptodate, has_flags);
555 seq_page_flag(seq, page, dirty, has_flags);
556 seq_page_flag(seq, page, highmem, has_flags);
558 seq_puts(seq, "-]\n");
560 seq_puts(seq, "]\n");
563 spin_unlock(&sbi->ll_lock);
568 static void *llite_dump_pgcache_seq_next(struct seq_file *seq, void *v,
571 struct ll_async_page *llap, *dummy_llap = seq->private;
572 struct ll_sb_info *sbi = dummy_llap->llap_cookie;
574 /* bail if we just displayed the banner */
575 if (dummy_llap->llap_magic == 0) {
576 dummy_llap->llap_magic = 1;
580 /* we've just displayed the llap that is after us in the list.
581 * we advance to a position beyond it, returning null if there
582 * isn't another llap in the list beyond that new position. */
583 spin_lock(&sbi->ll_lock);
584 llap = llite_pglist_next_llap(sbi, &dummy_llap->llap_pglist_item);
585 list_del_init(&dummy_llap->llap_pglist_item);
587 list_add(&dummy_llap->llap_pglist_item,&llap->llap_pglist_item);
588 llap =llite_pglist_next_llap(sbi,&dummy_llap->llap_pglist_item);
590 spin_unlock(&sbi->ll_lock);
594 dummy_llap->llap_magic = 2;
600 static void llite_dump_pgcache_seq_stop(struct seq_file *seq, void *v)
604 struct seq_operations llite_dump_pgcache_seq_sops = {
605 .start = llite_dump_pgcache_seq_start,
606 .stop = llite_dump_pgcache_seq_stop,
607 .next = llite_dump_pgcache_seq_next,
608 .show = llite_dump_pgcache_seq_show,
611 /* we're displaying llaps in a list_head list. we don't want to hold a lock
612 * while we walk the entire list, and we don't want to have to seek into
613 * the right position in the list as an app advances with many syscalls. we
614 * allocate a dummy llap and hang it off file->private. its position in
615 * the list records where the app is currently displaying. this way our
616 * seq .start and .stop don't actually do anything. .next returns null
617 * when the dummy hits the end of the list which eventually leads to .release
618 * where we tear down. this kind of displaying is super-racey, so we put
619 * a generation counter on the list so the output shows when the list
620 * changes between reads.
622 static int llite_dump_pgcache_seq_open(struct inode *inode, struct file *file)
624 struct proc_dir_entry *dp = PDE(inode);
625 struct ll_async_page *dummy_llap;
626 struct seq_file *seq;
627 struct ll_sb_info *sbi = dp->data;
630 OBD_ALLOC_GFP(dummy_llap, sizeof(*dummy_llap), GFP_KERNEL);
631 if (dummy_llap == NULL)
633 dummy_llap->llap_page = NULL;
634 dummy_llap->llap_cookie = sbi;
635 dummy_llap->llap_magic = 0;
637 rc = seq_open(file, &llite_dump_pgcache_seq_sops);
639 OBD_FREE(dummy_llap, sizeof(*dummy_llap));
642 seq = file->private_data;
643 seq->private = dummy_llap;
645 spin_lock(&sbi->ll_lock);
646 list_add(&dummy_llap->llap_pglist_item, &sbi->ll_pglist);
647 spin_unlock(&sbi->ll_lock);
652 static int llite_dump_pgcache_seq_release(struct inode *inode,
655 struct seq_file *seq = file->private_data;
656 struct ll_async_page *dummy_llap = seq->private;
657 struct ll_sb_info *sbi = dummy_llap->llap_cookie;
659 spin_lock(&sbi->ll_lock);
660 if (!list_empty(&dummy_llap->llap_pglist_item))
661 list_del_init(&dummy_llap->llap_pglist_item);
662 spin_unlock(&sbi->ll_lock);
663 OBD_FREE(dummy_llap, sizeof(*dummy_llap));
665 return seq_release(inode, file);
668 struct file_operations llite_dump_pgcache_fops = {
669 .owner = THIS_MODULE,
670 .open = llite_dump_pgcache_seq_open,
672 .release = llite_dump_pgcache_seq_release,
675 static int ll_ra_stats_seq_show(struct seq_file *seq, void *v)
678 struct ll_sb_info *sbi = seq->private;
679 struct ll_ra_info *ra = &sbi->ll_ra_info;
681 static char *ra_stat_strings[] = {
682 [RA_STAT_HIT] = "hits",
683 [RA_STAT_MISS] = "misses",
684 [RA_STAT_DISTANT_READPAGE] = "readpage not consecutive",
685 [RA_STAT_MISS_IN_WINDOW] = "miss inside window",
686 [RA_STAT_FAILED_GRAB_PAGE] = "failed grab_cache_page",
687 [RA_STAT_FAILED_MATCH] = "failed lock match",
688 [RA_STAT_DISCARDED] = "read but discarded",
689 [RA_STAT_ZERO_LEN] = "zero length file",
690 [RA_STAT_ZERO_WINDOW] = "zero size window",
691 [RA_STAT_EOF] = "read-ahead to EOF",
692 [RA_STAT_MAX_IN_FLIGHT] = "hit max r-a issue",
695 do_gettimeofday(&now);
697 spin_lock(&sbi->ll_lock);
699 seq_printf(seq, "snapshot_time: %lu.%lu (secs.usecs)\n",
700 now.tv_sec, now.tv_usec);
701 seq_printf(seq, "pending issued pages: %lu\n",
704 for(i = 0; i < _NR_RA_STAT; i++)
705 seq_printf(seq, "%-25s %lu\n", ra_stat_strings[i],
708 spin_unlock(&sbi->ll_lock);
713 static void *ll_ra_stats_seq_start(struct seq_file *p, loff_t *pos)
719 static void *ll_ra_stats_seq_next(struct seq_file *p, void *v, loff_t *pos)
724 static void ll_ra_stats_seq_stop(struct seq_file *p, void *v)
727 struct seq_operations ll_ra_stats_seq_sops = {
728 .start = ll_ra_stats_seq_start,
729 .stop = ll_ra_stats_seq_stop,
730 .next = ll_ra_stats_seq_next,
731 .show = ll_ra_stats_seq_show,
734 static int ll_ra_stats_seq_open(struct inode *inode, struct file *file)
736 struct proc_dir_entry *dp = PDE(inode);
737 struct seq_file *seq;
740 rc = seq_open(file, &ll_ra_stats_seq_sops);
743 seq = file->private_data;
744 seq->private = dp->data;
748 static ssize_t ll_ra_stats_seq_write(struct file *file, const char *buf,
749 size_t len, loff_t *off)
751 struct seq_file *seq = file->private_data;
752 struct ll_sb_info *sbi = seq->private;
753 struct ll_ra_info *ra = &sbi->ll_ra_info;
755 spin_lock(&sbi->ll_lock);
756 memset(ra->ra_stats, 0, sizeof(ra->ra_stats));
757 spin_unlock(&sbi->ll_lock);
762 struct file_operations ll_ra_stats_fops = {
763 .owner = THIS_MODULE,
764 .open = ll_ra_stats_seq_open,
766 .write = ll_ra_stats_seq_write,
768 .release = seq_release,