Btrfs: simplify iteration codes

[linux-2.6-block.git] / fs / btrfs / volumes.c

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 397c8db1bc274f8a8b130e46cf5364733201cdf2..fd0bedb07a6405d78f66ef7de63965b17d5617d3 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -103,10 +103,8 @@ static noinline struct btrfs_device *__find_device(struct list_head *head,
                                                   u64 devid, u8 *uuid)
 {
        struct btrfs_device *dev;
-       struct list_head *cur;
 
-       list_for_each(cur, head) {
-               dev = list_entry(cur, struct btrfs_device, dev_list);
+       list_for_each_entry(dev, head, dev_list) {
                if (dev->devid == devid &&
                    (!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) {
                        return dev;
@@ -117,11 +115,9 @@ static noinline struct btrfs_device *__find_device(struct list_head *head,
 
 static noinline struct btrfs_fs_devices *find_fsid(u8 *fsid)
 {
-       struct list_head *cur;
        struct btrfs_fs_devices *fs_devices;
 
-       list_for_each(cur, &fs_uuids) {
-               fs_devices = list_entry(cur, struct btrfs_fs_devices, list);
+       list_for_each_entry(fs_devices, &fs_uuids, list) {
                if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0)
                        return fs_devices;
        }
@@ -344,14 +340,11 @@ error:
 
 int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices)
 {
-       struct list_head *tmp;
-       struct list_head *cur;
-       struct btrfs_device *device;
+       struct btrfs_device *device, *next;
 
        mutex_lock(&uuid_mutex);
 again:
-       list_for_each_safe(cur, tmp, &fs_devices->devices) {
-               device = list_entry(cur, struct btrfs_device, dev_list);
+       list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
                if (device->in_fs_metadata)
                        continue;
 
@@ -382,14 +375,12 @@ again:
 
 static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
 {
-       struct list_head *cur;
        struct btrfs_device *device;
 
        if (--fs_devices->opened > 0)
                return 0;
 
-       list_for_each(cur, &fs_devices->devices) {
-               device = list_entry(cur, struct btrfs_device, dev_list);
+       list_for_each_entry(device, &fs_devices->devices, dev_list) {
                if (device->bdev) {
                        close_bdev_exclusive(device->bdev, device->mode);
                        fs_devices->open_devices--;
@@ -438,7 +429,6 @@ static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
 {
        struct block_device *bdev;
        struct list_head *head = &fs_devices->devices;
-       struct list_head *cur;
        struct btrfs_device *device;
        struct block_device *latest_bdev = NULL;
        struct buffer_head *bh;
@@ -449,8 +439,7 @@ static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
        int seeding = 1;
        int ret = 0;
 
-       list_for_each(cur, head) {
-               device = list_entry(cur, struct btrfs_device, dev_list);
+       list_for_each_entry(device, head, dev_list) {
                if (device->bdev)
                        continue;
                if (!device->name)
@@ -1016,14 +1005,12 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
        }
 
        if (strcmp(device_path, "missing") == 0) {
-               struct list_head *cur;
                struct list_head *devices;
                struct btrfs_device *tmp;
 
                device = NULL;
                devices = &root->fs_info->fs_devices->devices;
-               list_for_each(cur, devices) {
-                       tmp = list_entry(cur, struct btrfs_device, dev_list);
+               list_for_each_entry(tmp, devices, dev_list) {
                        if (tmp->in_fs_metadata && !tmp->bdev) {
                                device = tmp;
                                break;
@@ -1279,7 +1266,6 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
        struct btrfs_trans_handle *trans;
        struct btrfs_device *device;
        struct block_device *bdev;
-       struct list_head *cur;
        struct list_head *devices;
        struct super_block *sb = root->fs_info->sb;
        u64 total_bytes;
@@ -1303,8 +1289,7 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
        mutex_lock(&root->fs_info->volume_mutex);
 
        devices = &root->fs_info->fs_devices->devices;
-       list_for_each(cur, devices) {
-               device = list_entry(cur, struct btrfs_device, dev_list);
+       list_for_each_entry(device, devices, dev_list) {
                if (device->bdev == bdev) {
                        ret = -EEXIST;
                        goto error;
@@ -1703,7 +1688,6 @@ static u64 div_factor(u64 num, int factor)
 int btrfs_balance(struct btrfs_root *dev_root)
 {
        int ret;
-       struct list_head *cur;
        struct list_head *devices = &dev_root->fs_info->fs_devices->devices;
        struct btrfs_device *device;
        u64 old_size;
@@ -1722,8 +1706,7 @@ int btrfs_balance(struct btrfs_root *dev_root)
        dev_root = dev_root->fs_info->dev_root;
 
        /* step one make some room on all the devices */
-       list_for_each(cur, devices) {
-               device = list_entry(cur, struct btrfs_device, dev_list);
+       list_for_each_entry(device, devices, dev_list) {
                old_size = device->total_bytes;
                size_to_free = div_factor(old_size, 1);
                size_to_free = min(size_to_free, (u64)1 * 1024 * 1024);