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btrfs: Make btrfs_find_device_by_devspec return btrfs_device directly

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Instead of returning an error value and using one of the parameters for
returning the actual object we are interested in just refactor the
function to directly return btrfs_device *. Also bubble up the error
handling for the special BTRFS_ERROR_DEV_MISSING_NOT_FOUND value into
btrfs_rm_device. No functional changes.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2018-09-03 12:46:14 +03:00 committed by David Sterba
parent 6c05040702
commit a27a94c2b0
3 changed files with 25 additions and 28 deletions
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8
fs/btrfs/dev-replace.c
View File

@ -409,10 +409,10 @@ int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info,
struct btrfs_device *tgt_device = NULL;
struct btrfs_device *src_device = NULL;
ret = btrfs_find_device_by_devspec(fs_info, srcdevid,
srcdev_name, &src_device);
if (ret)
return ret;
src_device = btrfs_find_device_by_devspec(fs_info, srcdevid,
srcdev_name);
if (IS_ERR(src_device))
return PTR_ERR(src_device);
ret = btrfs_init_dev_replace_tgtdev(fs_info, tgtdev_name,
src_device, &tgt_device);

39
fs/btrfs/volumes.c
View File

@ -1889,10 +1889,16 @@ int btrfs_rm_device(struct btrfs_fs_info *fs_info, const char *device_path,
if (ret)
goto out;
ret = btrfs_find_device_by_devspec(fs_info, devid, device_path,
&device);
if (ret)
device = btrfs_find_device_by_devspec(fs_info, devid, device_path);
if (IS_ERR(device)) {
if (PTR_ERR(device) == -ENOENT &&
strcmp(device_path, "missing") == 0)
ret = BTRFS_ERROR_DEV_MISSING_NOT_FOUND;
else
ret = PTR_ERR(device);
goto out;
}
if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) {
ret = BTRFS_ERROR_DEV_TGT_REPLACE;
@ -2163,30 +2169,21 @@ static struct btrfs_device *btrfs_find_device_missing_or_by_path(
/*
* Lookup a device given by device id, or the path if the id is 0.
*/
int btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info, u64 devid,
const char *devpath,
struct btrfs_device **device)
struct btrfs_device *btrfs_find_device_by_devspec(
struct btrfs_fs_info *fs_info, u64 devid, const char *devpath)
{
int ret = 0;
struct btrfs_device *device;
if (devid) {
*device = btrfs_find_device(fs_info, devid, NULL, NULL);
if (!*device)
ret = -ENOENT;
device = btrfs_find_device(fs_info, devid, NULL, NULL);
if (!device)
return ERR_PTR(-ENOENT);
} else {
if (!devpath || !devpath[0])
return -EINVAL;
*device = btrfs_find_device_missing_or_by_path(fs_info, devpath);
if (IS_ERR(*device)) {
if (PTR_ERR(*device) == -ENOENT &&
strcmp(devpath, "missing") == 0)
ret = BTRFS_ERROR_DEV_MISSING_NOT_FOUND;
else
ret = PTR_ERR(*device);
}
return ERR_PTR(-EINVAL);
device = btrfs_find_device_missing_or_by_path(fs_info, devpath);
}
return ret;
return device;
}
/*

6
fs/btrfs/volumes.h
View File

@ -410,9 +410,9 @@ int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices, int step);
void btrfs_assign_next_active_device(struct btrfs_device *device,
struct btrfs_device *this_dev);
int btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info, u64 devid,
const char *devpath,
struct btrfs_device **device);
struct btrfs_device *btrfs_find_device_by_devspec(struct btrfs_fs_info *fs_info,
u64 devid,
const char *devpath);
struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
const u64 *devid,
const u8 *uuid);