summaryrefslogtreecommitdiffstats
path: root/fs/btrfs/disk-io.c
diff options
context:
space:
mode:
authorChris Mason <chris.mason@oracle.com>2009-06-10 09:51:32 -0400
committerChris Mason <chris.mason@oracle.com>2009-06-10 11:29:52 -0400
commitc289811cc096c57ff35550ee8132793a4f9b5b59 (patch)
tree47599d47419911c8365e0350e286dece1d5e48dd /fs/btrfs/disk-io.c
parent451d7585a8bb1b9bec0d676ce3dece1923164e55 (diff)
downloadlinux-c289811cc096c57ff35550ee8132793a4f9b5b59.tar.gz
linux-c289811cc096c57ff35550ee8132793a4f9b5b59.tar.bz2
linux-c289811cc096c57ff35550ee8132793a4f9b5b59.zip
Btrfs: autodetect SSD devices
During mount, btrfs will check the queue nonrot flag for all the devices found in the FS. If they are all non-rotating, SSD mode is enabled by default. If the FS was mounted with -o nossd, the non-rotating flag is ignored. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/disk-io.c')
-rw-r--r--fs/btrfs/disk-io.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index e572cf478a5d..f4dfbb7ab496 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1850,6 +1850,14 @@ struct btrfs_root *open_ctree(struct super_block *sb,
if (IS_ERR(fs_info->transaction_kthread))
goto fail_cleaner;
+ if (!btrfs_test_opt(tree_root, SSD) &&
+ !btrfs_test_opt(tree_root, NOSSD) &&
+ !fs_info->fs_devices->rotating) {
+ printk(KERN_INFO "Btrfs detected SSD devices, enabling SSD "
+ "mode\n");
+ btrfs_set_opt(fs_info->mount_opt, SSD);
+ }
+
if (btrfs_super_log_root(disk_super) != 0) {
u64 bytenr = btrfs_super_log_root(disk_super);
@@ -1893,6 +1901,7 @@ struct btrfs_root *open_ctree(struct super_block *sb,
fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location);
if (!fs_info->fs_root)
goto fail_trans_kthread;
+
return tree_root;
fail_trans_kthread: