Add mount option "priority_alloc=%s", now %s only supports "usage" and
"off". The latter is used for remount.
"priority_alloc=usage" will active priority aware allocator.
This mount option changes the way of find_free_extent to search
block groups and may cost more time.
Signed-off-by: Su Yue <suy.fnst@xxxxxxxxxxxxxx>
---
fs/btrfs/super.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index cbc9d0d2c12d..4a6ccd4c29fd 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -326,6 +326,7 @@ enum {
Opt_treelog, Opt_notreelog,
Opt_usebackuproot,
Opt_user_subvol_rm_allowed,
+ Opt_priority_allocator,
/* Deprecated options */
Opt_alloc_start,
@@ -393,6 +394,7 @@ static const match_table_t tokens = {
{Opt_notreelog, "notreelog"},
{Opt_usebackuproot, "usebackuproot"},
{Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"},
+ {Opt_priority_allocator, "priority_alloc=%s"},
/* Deprecated options */
{Opt_alloc_start, "alloc_start=%s"},
@@ -765,6 +767,18 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
case Opt_skip_balance:
btrfs_set_opt(info->mount_opt, SKIP_BALANCE);
break;
+ case Opt_priority_allocator:
+ if (strcmp(args[0].from, "usage") == 0) {
+ btrfs_set_and_info(info, PRIORITY_USAGE,
+ "using priority usage-aware allocator");
+ } else if (strcmp(args[0].from, "off") == 0) {
+ btrfs_clear_and_info(info, PRIORITY_USAGE,
+ "priority awareallocator disabled");
+ } else {
+ ret = -EINVAL;
+ goto out;
+ }
+ break;
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
case Opt_check_integrity_including_extent_data:
btrfs_info(info,
@@ -1337,6 +1351,10 @@ static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
seq_puts(seq, ",inode_cache");
if (btrfs_test_opt(info, SKIP_BALANCE))
seq_puts(seq, ",skip_balance");
+ if (btrfs_test_opt(info, PRIORITY_USAGE))
+ seq_puts(seq, ",priority_alloc=usage");
+ else
+ seq_puts(seq, ",priority_alloc=off");
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
if (btrfs_test_opt(info, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA))
seq_puts(seq, ",check_int_data");
--
2.19.1
