Btrfs: Always use 64bit inode number

There's a potential problem in 32bit system when we exhaust 32bit inode
numbers and start to allocate big inode numbers, because btrfs uses
inode->i_ino in many places.

So here we always use BTRFS_I(inode)->location.objectid, which is an
u64 variable.

There are 2 exceptions that BTRFS_I(inode)->location.objectid !=
inode->i_ino: the btree inode (0 vs 1) and empty subvol dirs (256 vs 2),
and inode->i_ino will be used in those cases.

Another reason to make this change is I'm going to use a special inode
to save free ino cache, and the inode number must be > (u64)-256.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>

1 files changed, 13 insertions, 11 deletions

diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index e6cb89357256..7b75e0c8ef8d 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -1410,9 +1410,9 @@ again:
                 prev = node;
                 entry = rb_entry(node, struct btrfs_inode, rb_node);
 
-                if (objectid < entry->vfs_inode.i_ino)
+                if (objectid < btrfs_ino(&entry->vfs_inode))
                         node = node->rb_left;
-                else if (objectid > entry->vfs_inode.i_ino)
+                else if (objectid > btrfs_ino(&entry->vfs_inode))
                         node = node->rb_right;
                 else
                         break;
@@ -1420,7 +1420,7 @@ again:
         if (!node) {
                 while (prev) {
                         entry = rb_entry(prev, struct btrfs_inode, rb_node);
-                        if (objectid <= entry->vfs_inode.i_ino) {
+                        if (objectid <= btrfs_ino(&entry->vfs_inode)) {
                                 node = prev;
                                 break;
                         }
@@ -1435,7 +1435,7 @@ again:
                         return inode;
                 }
 
-                objectid = entry->vfs_inode.i_ino + 1;
+                objectid = btrfs_ino(&entry->vfs_inode) + 1;
                 if (cond_resched_lock(&root->inode_lock))
                         goto again;
 
@@ -1471,7 +1471,7 @@ static int get_new_location(struct inode *reloc_inode, u64 *new_bytenr,
                 return -ENOMEM;
 
         bytenr -= BTRFS_I(reloc_inode)->index_cnt;
-        ret = btrfs_lookup_file_extent(NULL, root, path, reloc_inode->i_ino,
+        ret = btrfs_lookup_file_extent(NULL, root, path, btrfs_ino(reloc_inode),
                                        bytenr, 0);
         if (ret < 0)
                 goto out;
@@ -1559,11 +1559,11 @@ int replace_file_extents(struct btrfs_trans_handle *trans,
                         if (first) {
                                 inode = find_next_inode(root, key.objectid);
                                 first = 0;
-                        } else if (inode && inode->i_ino < key.objectid) {
+                        } else if (inode && btrfs_ino(inode) < key.objectid) {
                                 btrfs_add_delayed_iput(inode);
                                 inode = find_next_inode(root, key.objectid);
                         }
-                        if (inode && inode->i_ino == key.objectid) {
+                        if (inode && btrfs_ino(inode) == key.objectid) {
                                 end = key.offset +
                                       btrfs_file_extent_num_bytes(leaf, fi);
                                 WARN_ON(!IS_ALIGNED(key.offset,
@@ -1894,6 +1894,7 @@ static int invalidate_extent_cache(struct btrfs_root *root,
         struct inode *inode = NULL;
         u64 objectid;
         u64 start, end;
+        u64 ino;
 
         objectid = min_key->objectid;
         while (1) {
@@ -1906,17 +1907,18 @@ static int invalidate_extent_cache(struct btrfs_root *root,
                 inode = find_next_inode(root, objectid);
                 if (!inode)
                         break;
+                ino = btrfs_ino(inode);
 
-                if (inode->i_ino > max_key->objectid) {
+                if (ino > max_key->objectid) {
                         iput(inode);
                         break;
                 }
 
-                objectid = inode->i_ino + 1;
+                objectid = ino + 1;
                 if (!S_ISREG(inode->i_mode))
                         continue;
 
-                if (unlikely(min_key->objectid == inode->i_ino)) {
+                if (unlikely(min_key->objectid == ino)) {
                         if (min_key->type > BTRFS_EXTENT_DATA_KEY)
                                 continue;
                         if (min_key->type < BTRFS_EXTENT_DATA_KEY)
@@ -1929,7 +1931,7 @@ static int invalidate_extent_cache(struct btrfs_root *root,
                         start = 0;
                 }
 
-                if (unlikely(max_key->objectid == inode->i_ino)) {
+                if (unlikely(max_key->objectid == ino)) {
                         if (max_key->type < BTRFS_EXTENT_DATA_KEY)
                                 continue;
                         if (max_key->type > BTRFS_EXTENT_DATA_KEY) {