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Btrfs: Always use 64bit inode number

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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
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9
fs/btrfs/btrfs_inode.h
View file

@ -166,6 +166,15 @@ static inline struct btrfs_inode *BTRFS_I(struct inode *inode)
return container_of(inode, struct btrfs_inode, vfs_inode);
}
static inline u64 btrfs_ino(struct inode *inode)
{
u64 ino = BTRFS_I(inode)->location.objectid;
if (ino <= BTRFS_FIRST_FREE_OBJECTID)
ino = inode->i_ino;
return ino;
}
static inline void btrfs_i_size_write(struct inode *inode, u64 size)
{
i_size_write(inode, size);