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Subject[PATCH 02/17] staging: lustre: fix bug in osc_enter_cache_try
The lustre-release patch commit bdc5bb52c554 ("LU-4933 osc:
Automatically increase the max_dirty_mb") changed

- if (cli->cl_dirty + PAGE_CACHE_SIZE <= cli->cl_dirty_max &&
+ if (cli->cl_dirty_pages < cli->cl_dirty_max_pages &&

When this patch landed in Linux a couple of years later, it landed as

- if (cli->cl_dirty + PAGE_SIZE <= cli->cl_dirty_max &&
+ if (cli->cl_dirty_pages <= cli->cl_dirty_max_pages &&

which is clearly different ('<=' vs '<'), and allows cl_dirty_pages to
increase beyond cl_dirty_max_pages - which causes a latter assertion
to fails.

Fixes: 3147b268400a ("staging: lustre: osc: Automatically increase the max_dirty_mb")
Signed-off-by: NeilBrown <neilb@suse.com>
---
drivers/staging/lustre/lustre/include/obd.h | 2 +-
drivers/staging/lustre/lustre/osc/osc_cache.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/lustre/lustre/include/obd.h b/drivers/staging/lustre/lustre/include/obd.h
index 4368f4e9f208..f1233ca7d337 100644
--- a/drivers/staging/lustre/lustre/include/obd.h
+++ b/drivers/staging/lustre/lustre/include/obd.h
@@ -191,7 +191,7 @@ struct client_obd {
struct sptlrpc_flavor cl_flvr_mgc; /* fixed flavor of mgc->mgs */

/* the grant values are protected by loi_list_lock below */
- unsigned long cl_dirty_pages; /* all _dirty_ in pahges */
+ unsigned long cl_dirty_pages; /* all _dirty_ in pages */
unsigned long cl_dirty_max_pages; /* allowed w/o rpc */
unsigned long cl_dirty_transit; /* dirty synchronous */
unsigned long cl_avail_grant; /* bytes of credit for ost */
diff --git a/drivers/staging/lustre/lustre/osc/osc_cache.c b/drivers/staging/lustre/lustre/osc/osc_cache.c
index 1c70a504ee89..459503727ce3 100644
--- a/drivers/staging/lustre/lustre/osc/osc_cache.c
+++ b/drivers/staging/lustre/lustre/osc/osc_cache.c
@@ -1529,7 +1529,7 @@ static int osc_enter_cache_try(struct client_obd *cli,
if (rc < 0)
return 0;

- if (cli->cl_dirty_pages <= cli->cl_dirty_max_pages &&
+ if (cli->cl_dirty_pages < cli->cl_dirty_max_pages &&
atomic_long_read(&obd_dirty_pages) + 1 <= obd_max_dirty_pages) {
osc_consume_write_grant(cli, &oap->oap_brw_page);
if (transient) {

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