Line data    Source code

       1             : /* SPDX-License-Identifier: GPL-2.0 */
       2             : 
       3             : #ifndef BTRFS_INODE_ITEM_H
       4             : #define BTRFS_INODE_ITEM_H
       5             : 
       6             : #include <linux/types.h>
       7             : 
       8             : struct btrfs_trans_handle;
       9             : struct btrfs_root;
      10             : struct btrfs_path;
      11             : struct btrfs_key;
      12             : struct btrfs_inode_extref;
      13             : struct btrfs_inode;
      14             : struct extent_buffer;
      15             : 
      16             : /*
      17             :  * Return this if we need to call truncate_block for the last bit of the
      18             :  * truncate.
      19             :  */
      20             : #define BTRFS_NEED_TRUNCATE_BLOCK               1
      21             : 
      22             : struct btrfs_truncate_control {
      23             :         /*
      24             :          * IN: the inode we're operating on, this can be NULL if
      25             :          * ->clear_extent_range is false.
      26             :          */
      27             :         struct btrfs_inode *inode;
      28             : 
      29             :         /* IN: the size we're truncating to. */
      30             :         u64 new_size;
      31             : 
      32             :         /* OUT: the number of extents truncated. */
      33             :         u64 extents_found;
      34             : 
      35             :         /* OUT: the last size we truncated this inode to. */
      36             :         u64 last_size;
      37             : 
      38             :         /* OUT: the number of bytes to sub from this inode. */
      39             :         u64 sub_bytes;
      40             : 
      41             :         /* IN: the ino we are truncating. */
      42             :         u64 ino;
      43             : 
      44             :         /*
      45             :          * IN: minimum key type to remove.  All key types with this type are
      46             :          * removed only if their offset >= new_size.
      47             :          */
      48             :         u32 min_type;
      49             : 
      50             :         /*
      51             :          * IN: true if we don't want to do extent reference updates for any file
      52             :          * extents we drop.
      53             :          */
      54             :         bool skip_ref_updates;
      55             : 
      56             :         /*
      57             :          * IN: true if we need to clear the file extent range for the inode as
      58             :          * we drop the file extent items.
      59             :          */
      60             :         bool clear_extent_range;
      61             : };
      62             : 
      63             : /*
      64             :  * btrfs_inode_item stores flags in a u64, btrfs_inode stores them in two
      65             :  * separate u32s. These two functions convert between the two representations.
      66             :  */
      67             : static inline u64 btrfs_inode_combine_flags(u32 flags, u32 ro_flags)
      68             : {
      69           0 :         return (flags | ((u64)ro_flags << 32));
      70             : }
      71             : 
      72             : static inline void btrfs_inode_split_flags(u64 inode_item_flags,
      73             :                                            u32 *flags, u32 *ro_flags)
      74             : {
      75           0 :         *flags = (u32)inode_item_flags;
      76           0 :         *ro_flags = (u32)(inode_item_flags >> 32);
      77           0 : }
      78             : 
      79             : int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
      80             :                                struct btrfs_root *root,
      81             :                                struct btrfs_truncate_control *control);
      82             : int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
      83             :                            struct btrfs_root *root, const struct fscrypt_str *name,
      84             :                            u64 inode_objectid, u64 ref_objectid, u64 index);
      85             : int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
      86             :                         struct btrfs_root *root, const struct fscrypt_str *name,
      87             :                         u64 inode_objectid, u64 ref_objectid, u64 *index);
      88             : int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
      89             :                              struct btrfs_root *root,
      90             :                              struct btrfs_path *path, u64 objectid);
      91             : int btrfs_lookup_inode(struct btrfs_trans_handle *trans,
      92             :                        struct btrfs_root *root, struct btrfs_path *path,
      93             :                        struct btrfs_key *location, int mod);
      94             : 
      95             : struct btrfs_inode_extref *btrfs_lookup_inode_extref(
      96             :                           struct btrfs_trans_handle *trans,
      97             :                           struct btrfs_root *root,
      98             :                           struct btrfs_path *path,
      99             :                           const struct fscrypt_str *name,
     100             :                           u64 inode_objectid, u64 ref_objectid, int ins_len,
     101             :                           int cow);
     102             : 
     103             : struct btrfs_inode_ref *btrfs_find_name_in_backref(struct extent_buffer *leaf,
     104             :                                                    int slot,
     105             :                                                    const struct fscrypt_str *name);
     106             : struct btrfs_inode_extref *btrfs_find_name_in_ext_backref(
     107             :                 struct extent_buffer *leaf, int slot, u64 ref_objectid,
     108             :                 const struct fscrypt_str *name);
     109             : 
     110             : #endif