xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Btrfs: disallow some operations on the device replace target device

Browse Source 
This patch adds some code to disallow operations on the device that
is used as the target for the device replace operation.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Stefan Behrens
2012-11-05 18:29:28 +01:00
committed by Josef Bacik
parent 5ac00addc7
commit 63a212abc2
7 changed files with 54 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
fs/btrfs/volumes.c
View File

@@ -518,8 +518,9 @@ again:
/* This is the initialized path, it is safe to release the devices. */
list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
if (device->in_fs_metadata) {
if (!latest_transid ||
device->generation > latest_transid) {
if (!device->is_tgtdev_for_dev_replace &&
(!latest_transid ||
device->generation > latest_transid)) {
latest_devid = device->devid;
latest_transid = device->generation;
latest_bdev = device->bdev;
@@ -814,7 +815,7 @@ int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
*length = 0;
if (start >= device->total_bytes)
if (start >= device->total_bytes || device->is_tgtdev_for_dev_replace)
return 0;
path = btrfs_alloc_path();
@@ -931,7 +932,7 @@ int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes,
max_hole_size = 0;
hole_size = 0;
if (search_start >= search_end) {
if (search_start >= search_end || device->is_tgtdev_for_dev_replace) {
ret = -ENOSPC;
goto error;
}
@@ -1114,6 +1115,7 @@ int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
struct btrfs_key key;
WARN_ON(!device->in_fs_metadata);
WARN_ON(device->is_tgtdev_for_dev_replace);
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
@@ -1375,7 +1377,9 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
* is held.
*/
list_for_each_entry(tmp, devices, dev_list) {
if (tmp->in_fs_metadata && !tmp->bdev) {
if (tmp->in_fs_metadata &&
!tmp->is_tgtdev_for_dev_replace &&
!tmp->bdev) {
device = tmp;
break;
}
@@ -1406,6 +1410,12 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
}
}
if (device->is_tgtdev_for_dev_replace) {
pr_err("btrfs: unable to remove the dev_replace target dev\n");
ret = -EINVAL;
goto error_brelse;
}
if (device->writeable && root->fs_info->fs_devices->rw_devices == 1) {
printk(KERN_ERR "btrfs: unable to remove the only writeable "
"device\n");
@@ -1425,6 +1435,11 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
if (ret)
goto error_undo;
/*
* TODO: the superblock still includes this device in its num_devices
* counter although write_all_supers() is not locked out. This
* could give a filesystem state which requires a degraded mount.
*/
ret = btrfs_rm_dev_item(root->fs_info->chunk_root, device);
if (ret)
goto error_undo;
@@ -1808,6 +1823,7 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
device->dev_root = root->fs_info->dev_root;
device->bdev = bdev;
device->in_fs_metadata = 1;
device->is_tgtdev_for_dev_replace = 0;
device->mode = FMODE_EXCL;
set_blocksize(device->bdev, 4096);
@@ -1971,7 +1987,8 @@ static int __btrfs_grow_device(struct btrfs_trans_handle *trans,
if (!device->writeable)
return -EACCES;
if (new_size <= device->total_bytes)
if (new_size <= device->total_bytes ||
device->is_tgtdev_for_dev_replace)
return -EINVAL;
btrfs_set_super_total_bytes(super_copy, old_total + diff);
@@ -2600,7 +2617,8 @@ static int __btrfs_balance(struct btrfs_fs_info *fs_info)
size_to_free = div_factor(old_size, 1);
size_to_free = min(size_to_free, (u64)1 * 1024 * 1024);
if (!device->writeable ||
device->total_bytes - device->bytes_used > size_to_free)
device->total_bytes - device->bytes_used > size_to_free ||
device->is_tgtdev_for_dev_replace)
continue;
ret = btrfs_shrink_device(device, old_size - size_to_free);
@@ -3132,6 +3150,9 @@ int btrfs_shrink_device(struct btrfs_device *device, u64 new_size)
u64 old_size = device->total_bytes;
u64 diff = device->total_bytes - new_size;
if (device->is_tgtdev_for_dev_replace)
return -EINVAL;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
@@ -3401,7 +3422,8 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
continue;
}
if (!device->in_fs_metadata)
if (!device->in_fs_metadata ||
device->is_tgtdev_for_dev_replace)
continue;
if (device->total_bytes > device->bytes_used)
@@ -4612,6 +4634,7 @@ static void fill_device_from_item(struct extent_buffer *leaf,
device->io_align = btrfs_device_io_align(leaf, dev_item);
device->io_width = btrfs_device_io_width(leaf, dev_item);
device->sector_size = btrfs_device_sector_size(leaf, dev_item);
device->is_tgtdev_for_dev_replace = 0;
ptr = (unsigned long)btrfs_device_uuid(dev_item);
read_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE);
@@ -4722,7 +4745,7 @@ static int read_one_dev(struct btrfs_root *root,
fill_device_from_item(leaf, dev_item, device);
device->dev_root = root->fs_info->dev_root;
device->in_fs_metadata = 1;
if (device->writeable) {
if (device->writeable && !device->is_tgtdev_for_dev_replace) {
device->fs_devices->total_rw_bytes += device->total_bytes;
spin_lock(&root->fs_info->free_chunk_lock);
root->fs_info->free_chunk_space += device->total_bytes -