A refactor patch, and avoids user input verification in the
btrfs_dev_replace_start(), and so this function can be reused.
Signed-off-by: Anand Jain <anand.j...@oracle.com>
---
fs/btrfs/dev-replace.c | 62 ++++++++++++++++++++++++++++++--------------------
fs/btrfs/dev-replace.h | 4 +++-
fs/btrfs/ioctl.c | 2 +-
3 files changed, 41 insertions(+), 27 deletions(-)
diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index 025f42ef5ab3..2b926867d136 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -305,8 +305,8 @@ void btrfs_after_dev_replace_commit(struct btrfs_fs_info
*fs_info)
dev_replace->cursor_left_last_write_of_item;
}
-int btrfs_dev_replace_start(struct btrfs_root *root,
- struct btrfs_ioctl_dev_replace_args *args)
+int btrfs_dev_replace_start(struct btrfs_root *root, char *tgtdev_name,
+ u64 srcdevid, char *srcdev_name, int read_src)
{
struct btrfs_trans_handle *trans;
struct btrfs_fs_info *fs_info = root->fs_info;
@@ -315,29 +315,16 @@ int btrfs_dev_replace_start(struct btrfs_root *root,
struct btrfs_device *tgt_device = NULL;
struct btrfs_device *src_device = NULL;
- switch (args->start.cont_reading_from_srcdev_mode) {
- case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS:
- case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID:
- break;
- default:
- return -EINVAL;
- }
-
- if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') ||
- args->start.tgtdev_name[0] == '\0')
- return -EINVAL;
-
/* the disk copy procedure reuses the scrub code */
mutex_lock(&fs_info->volume_mutex);
- ret = btrfs_dev_replace_find_srcdev(root, args->start.srcdevid,
- args->start.srcdev_name,
- &src_device);
+ ret = btrfs_dev_replace_find_srcdev(root, srcdevid,
+ srcdev_name, &src_device);
if (ret) {
mutex_unlock(&fs_info->volume_mutex);
return ret;
}
- ret = btrfs_init_dev_replace_tgtdev(root, args->start.tgtdev_name,
+ ret = btrfs_init_dev_replace_tgtdev(root, tgtdev_name,
src_device, &tgt_device);
mutex_unlock(&fs_info->volume_mutex);
if (ret)
@@ -364,12 +351,11 @@ int btrfs_dev_replace_start(struct btrfs_root *root,
break;
case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED:
- args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED;
+ ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED;
goto leave;
}
- dev_replace->cont_reading_from_srcdev_mode =
- args->start.cont_reading_from_srcdev_mode;
+ dev_replace->cont_reading_from_srcdev_mode = read_src;
WARN_ON(!src_device);
dev_replace->srcdev = src_device;
WARN_ON(!tgt_device);
@@ -394,7 +380,6 @@ int btrfs_dev_replace_start(struct btrfs_root *root,
dev_replace->cursor_right = 0;
dev_replace->is_valid = 1;
dev_replace->item_needs_writeback = 1;
- args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
btrfs_dev_replace_unlock(dev_replace, 1);
btrfs_wait_ordered_roots(fs_info, -1);
@@ -416,10 +401,8 @@ int btrfs_dev_replace_start(struct btrfs_root *root,
&dev_replace->scrub_progress, 0, 1);
ret = btrfs_dev_replace_finishing(fs_info, ret);
- /* don't warn if EINPROGRESS, someone else might be running scrub */
if (ret == -EINPROGRESS) {
- args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS;
- ret = 0;
+ ret = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS;
} else {
WARN_ON(ret);
}
@@ -437,6 +420,35 @@ leave:
return ret;
}
+int btrfs_dev_replace_by_ioctl(struct btrfs_root *root,
+ struct btrfs_ioctl_dev_replace_args *args)
+{
+ int ret;
+
+ switch (args->start.cont_reading_from_srcdev_mode) {
+ case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS:
+ case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') ||
+ args->start.tgtdev_name[0] == '\0')
+ return -EINVAL;
+
+ ret = btrfs_dev_replace_start(root, args->start.tgtdev_name,
+ args->start.srcdevid,
+ args->start.srcdev_name,
+
args->start.cont_reading_from_srcdev_mode);
+ args->result = ret;
+ /* don't warn if EINPROGRESS, someone else might be running scrub */
+ if (ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS)
+ ret = 0;
+
+ return ret;
+}
+
/*
* blocked until all flighting bios are finished.
*/
diff --git a/fs/btrfs/dev-replace.h b/fs/btrfs/dev-replace.h
index 29e3ef5f96bd..e922b42d91df 100644
--- a/fs/btrfs/dev-replace.h
+++ b/fs/btrfs/dev-replace.h
@@ -25,8 +25,10 @@ int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info);
int btrfs_run_dev_replace(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info);
void btrfs_after_dev_replace_commit(struct btrfs_fs_info *fs_info);
-int btrfs_dev_replace_start(struct btrfs_root *root,
+int btrfs_dev_replace_by_ioctl(struct btrfs_root *root,
struct btrfs_ioctl_dev_replace_args *args);
+int btrfs_dev_replace_start(struct btrfs_root *root, char *tgtdev_name,
+ u64 srcdevid, char *srcdev_name, int read_src);
void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info,
struct btrfs_ioctl_dev_replace_args *args);
int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info,
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 053e677839fe..a811089c3890 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -4376,7 +4376,7 @@ static long btrfs_ioctl_dev_replace(struct btrfs_root
*root, void __user *arg)
1)) {
ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
} else {
- ret = btrfs_dev_replace_start(root, p);
+ ret = btrfs_dev_replace_by_ioctl(root, p);
atomic_set(
&root->fs_info->mutually_exclusive_operation_running,
0);
--
2.7.0
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