Btrfs: simplify iteration codes

Merge list_for_each* and list_entry to list_for_each_entry*

Signed-off-by: Qinghuang Feng <qhfeng.kernel@gmail.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

6 files changed, 19 insertions, 52 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 0d8ccd625ba2..26a18779e84b 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1135,7 +1135,6 @@ static int btrfs_congested_fn(void *congested_data, int bdi_bits)
 {
         struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
         int ret = 0;
-        struct list_head *cur;
         struct btrfs_device *device;
         struct backing_dev_info *bdi;
 #if 0
@@ -1143,8 +1142,7 @@ static int btrfs_congested_fn(void *congested_data, int bdi_bits)
             btrfs_congested_async(info, 0))
                 return 1;
 #endif
-        list_for_each(cur, &info->fs_devices->devices) {
-                device = list_entry(cur, struct btrfs_device, dev_list);
+        list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
                 if (!device->bdev)
                         continue;
                 bdi = blk_get_backing_dev_info(device->bdev);
@@ -1162,13 +1160,11 @@ static int btrfs_congested_fn(void *congested_data, int bdi_bits)
  */
 static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
 {
-        struct list_head *cur;
         struct btrfs_device *device;
         struct btrfs_fs_info *info;
 
         info = (struct btrfs_fs_info *)bdi->unplug_io_data;
-        list_for_each(cur, &info->fs_devices->devices) {
-                device = list_entry(cur, struct btrfs_device, dev_list);
+        list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
                 if (!device->bdev)
                         continue;
 
@@ -1994,7 +1990,6 @@ static int write_dev_supers(struct btrfs_device *device,
 
 int write_all_supers(struct btrfs_root *root, int max_mirrors)
 {
-        struct list_head *cur;
         struct list_head *head = &root->fs_info->fs_devices->devices;
         struct btrfs_device *dev;
         struct btrfs_super_block *sb;
@@ -2010,8 +2005,7 @@ int write_all_supers(struct btrfs_root *root, int max_mirrors)
 
         sb = &root->fs_info->super_for_commit;
         dev_item = &sb->dev_item;
-        list_for_each(cur, head) {
-                dev = list_entry(cur, struct btrfs_device, dev_list);
+        list_for_each_entry(dev, head, dev_list) {
                 if (!dev->bdev) {
                         total_errors++;
                         continue;
@@ -2044,8 +2038,7 @@ int write_all_supers(struct btrfs_root *root, int max_mirrors)
         }
 
         total_errors = 0;
-        list_for_each(cur, head) {
-                dev = list_entry(cur, struct btrfs_device, dev_list);
+        list_for_each_entry(dev, head, dev_list) {
                 if (!dev->bdev)
                         continue;
                 if (!dev->in_fs_metadata || !dev->writeable)
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index cdc961e7556a..a4e36c38b81e 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -325,10 +325,8 @@ static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info,
                                                   u64 flags)
 {
         struct list_head *head = &info->space_info;
-        struct list_head *cur;
         struct btrfs_space_info *found;
-        list_for_each(cur, head) {
-                found = list_entry(cur, struct btrfs_space_info, list);
+        list_for_each_entry(found, head, list) {
                 if (found->flags == flags)
                         return found;
         }
@@ -3013,7 +3011,6 @@ loop_check:
 static void dump_space_info(struct btrfs_space_info *info, u64 bytes)
 {
         struct btrfs_block_group_cache *cache;
-        struct list_head *l;
 
         printk(KERN_INFO "space_info has %llu free, is %sfull\n",
                (unsigned long long)(info->total_bytes - info->bytes_used -
@@ -3021,8 +3018,7 @@ static void dump_space_info(struct btrfs_space_info *info, u64 bytes)
                (info->full) ? "" : "not ");
 
         down_read(&info->groups_sem);
-        list_for_each(l, &info->block_groups) {
-                cache = list_entry(l, struct btrfs_block_group_cache, list);
+        list_for_each_entry(cache, &info->block_groups, list) {
                 spin_lock(&cache->lock);
                 printk(KERN_INFO "block group %llu has %llu bytes, %llu used "
                        "%llu pinned %llu reserved\n",
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 44dbd550c4bd..45cf03ee1bc2 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1323,12 +1323,11 @@ static noinline int add_pending_csums(struct btrfs_trans_handle *trans,
                              struct inode *inode, u64 file_offset,
                              struct list_head *list)
 {
-        struct list_head *cur;
         struct btrfs_ordered_sum *sum;
 
         btrfs_set_trans_block_group(trans, inode);
-        list_for_each(cur, list) {
-                sum = list_entry(cur, struct btrfs_ordered_sum, list);
+
+        list_for_each_entry(sum, list, list) {
                 btrfs_csum_file_blocks(trans,
                        BTRFS_I(inode)->root->fs_info->csum_root, sum);
         }
diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c
index a20940170274..77c2411a5f0f 100644
--- a/fs/btrfs/ordered-data.c
+++ b/fs/btrfs/ordered-data.c
@@ -613,7 +613,6 @@ int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr,
         struct btrfs_sector_sum *sector_sums;
         struct btrfs_ordered_extent *ordered;
         struct btrfs_ordered_inode_tree *tree = &BTRFS_I(inode)->ordered_tree;
-        struct list_head *cur;
         unsigned long num_sectors;
         unsigned long i;
         u32 sectorsize = BTRFS_I(inode)->root->sectorsize;
@@ -624,8 +623,7 @@ int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr,
                 return 1;
 
         mutex_lock(&tree->mutex);
-        list_for_each_prev(cur, &ordered->list) {
-                ordered_sum = list_entry(cur, struct btrfs_ordered_sum, list);
+        list_for_each_entry_reverse(ordered_sum, &ordered->list, list) {
                 if (disk_bytenr >= ordered_sum->bytenr) {
                         num_sectors = ordered_sum->len / sectorsize;
                         sector_sums = ordered_sum->sums;
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 8a08f9443340..919172de5c9a 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -852,11 +852,9 @@ static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans,
 {
         struct btrfs_pending_snapshot *pending;
         struct list_head *head = &trans->transaction->pending_snapshots;
-        struct list_head *cur;
         int ret;
 
-        list_for_each(cur, head) {
-                pending = list_entry(cur, struct btrfs_pending_snapshot, list);
+        list_for_each_entry(pending, head, list) {
                 ret = create_pending_snapshot(trans, fs_info, pending);
                 BUG_ON(ret);
         }
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 397c8db1bc27..fd0bedb07a64 100644
--- 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);