bcachefs: sysfs internal/trigger_journal_flush

Add a sysfs knob for immediately flushing the entire journal.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

diff --git a/fs/bcachefs/sysfs.c b/fs/bcachefs/sysfs.c
index b18b0cc81b594ad6144b43599418418a1caf5e95..5be92fe3f4ea4e115512f0b7a31482919406a507 100644 (file)
--- a/fs/bcachefs/sysfs.c
+++ b/fs/bcachefs/sysfs.c
@@ -25,6 +25,7 @@
 #include "ec.h"
 #include "inode.h"
 #include "journal.h"
+#include "journal_reclaim.h"
 #include "keylist.h"
 #include "move.h"
 #include "movinggc.h"
@@ -138,6 +139,7 @@ do {                                                                        \
 write_attribute(trigger_gc);
 write_attribute(trigger_discards);
 write_attribute(trigger_invalidates);
+write_attribute(trigger_journal_flush);
 write_attribute(prune_cache);
 write_attribute(btree_wakeup);
 rw_attribute(btree_gc_periodic);
@@ -500,7 +502,7 @@ STORE(bch2_fs)
 
        /* Debugging: */
 
-       if (!test_bit(BCH_FS_rw, &c->flags))
+       if (!bch2_write_ref_tryget(c, BCH_WRITE_REF_sysfs))
                return -EROFS;
 
        if (attr == &sysfs_prune_cache) {
@@ -533,6 +535,11 @@ STORE(bch2_fs)
        if (attr == &sysfs_trigger_invalidates)
                bch2_do_invalidates(c);
 
+       if (attr == &sysfs_trigger_journal_flush) {
+               bch2_journal_flush_all_pins(&c->journal);
+               bch2_journal_meta(&c->journal);
+       }
+
 #ifdef CONFIG_BCACHEFS_TESTS
        if (attr == &sysfs_perf_test) {
                char *tmp = kstrdup(buf, GFP_KERNEL), *p = tmp;
@@ -553,6 +560,7 @@ STORE(bch2_fs)
                        size = ret;
        }
 #endif
+       bch2_write_ref_put(c, BCH_WRITE_REF_sysfs);
        return size;
 }
 SYSFS_OPS(bch2_fs);
@@ -651,6 +659,7 @@ struct attribute *bch2_fs_internal_files[] = {
        &sysfs_trigger_gc,
        &sysfs_trigger_discards,
        &sysfs_trigger_invalidates,
+       &sysfs_trigger_journal_flush,
        &sysfs_prune_cache,
        &sysfs_btree_wakeup,