ufs: beginning of __ufs_truncate_block() massage
Use ufs_block_to_path() to find the cutoff path in the block pointers' tree.
For now just use the information about the depth (to bypass the fully
preserved subtrees); subsequent commits will use the information about actual
path.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/ufs/inode.c b/fs/ufs/inode.c
index 4367218..afb0f32 100644
--- a/fs/ufs/inode.c
+++ b/fs/ufs/inode.c
@@ -1336,14 +1336,22 @@
struct ufs_inode_info *ufsi = UFS_I(inode);
struct super_block *sb = inode->i_sb;
struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
+ unsigned offsets[4];
+ int depth = ufs_block_to_path(inode, DIRECT_BLOCK, offsets);
mutex_lock(&ufsi->truncate_mutex);
- ufs_trunc_direct(inode);
- ufs_trunc_indirect(inode, UFS_IND_BLOCK,
+ switch (depth) {
+ case 1:
+ ufs_trunc_direct(inode);
+ case 2:
+ ufs_trunc_indirect(inode, UFS_IND_BLOCK,
ufs_get_direct_data_ptr(uspi, ufsi, UFS_IND_BLOCK));
- ufs_trunc_dindirect(inode, UFS_IND_BLOCK + uspi->s_apb,
+ case 3:
+ ufs_trunc_dindirect(inode, UFS_IND_BLOCK + uspi->s_apb,
ufs_get_direct_data_ptr(uspi, ufsi, UFS_DIND_BLOCK));
- ufs_trunc_tindirect(inode);
+ case 4:
+ ufs_trunc_tindirect(inode);
+ }
ufsi->i_lastfrag = DIRECT_FRAGMENT;
mutex_unlock(&ufsi->truncate_mutex);
}