lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Btrfs: Always use 64bit inode number

Browse Source 
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>
This commit is contained in:
Li Zefan
2011-04-20 10:31:50 +08:00
parent 0414efae79
commit 33345d0152
13 changed files with 208 additions and 182 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
fs/btrfs/relocation.c
View File

@@ -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) {