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Btrfs: autodetect SSD devices

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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>
This commit is contained in:
Chris Mason
2009-06-10 09:51:32 -04:00
parent 451d7585a8
commit c289811cc0
5 changed files with 24 additions and 0 deletions
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6
fs/btrfs/volumes.c
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@@ -605,6 +605,9 @@ static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
device->in_fs_metadata = 0;
device->mode = flags;
if (!blk_queue_nonrot(bdev_get_queue(bdev)))
fs_devices->rotating = 1;
fs_devices->open_devices++;
if (device->writeable) {
fs_devices->rw_devices++;
@@ -1473,6 +1476,9 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
root->fs_info->fs_devices->rw_devices++;
root->fs_info->fs_devices->total_rw_bytes += device->total_bytes;
if (!blk_queue_nonrot(bdev_get_queue(bdev)))
root->fs_info->fs_devices->rotating = 1;
total_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
btrfs_set_super_total_bytes(&root->fs_info->super_copy,
total_bytes + device->total_bytes);