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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /fs/btrfs/extent_map.h
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'fs/btrfs/extent_map.h')
-rw-r--r--fs/btrfs/extent_map.h118
1 files changed, 118 insertions, 0 deletions
diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
new file mode 100644
index 000000000..68d3f2c9e
--- /dev/null
+++ b/fs/btrfs/extent_map.h
@@ -0,0 +1,118 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef BTRFS_EXTENT_MAP_H
+#define BTRFS_EXTENT_MAP_H
+
+#include <linux/rbtree.h>
+#include <linux/refcount.h>
+
+#define EXTENT_MAP_LAST_BYTE ((u64)-4)
+#define EXTENT_MAP_HOLE ((u64)-3)
+#define EXTENT_MAP_INLINE ((u64)-2)
+/* used only during fiemap calls */
+#define EXTENT_MAP_DELALLOC ((u64)-1)
+
+/* bits for the extent_map::flags field */
+enum {
+ /* this entry not yet on disk, don't free it */
+ EXTENT_FLAG_PINNED,
+ EXTENT_FLAG_COMPRESSED,
+ /* pre-allocated extent */
+ EXTENT_FLAG_PREALLOC,
+ /* Logging this extent */
+ EXTENT_FLAG_LOGGING,
+ /* Filling in a preallocated extent */
+ EXTENT_FLAG_FILLING,
+ /* filesystem extent mapping type */
+ EXTENT_FLAG_FS_MAPPING,
+ /* This em is merged from two or more physically adjacent ems */
+ EXTENT_FLAG_MERGED,
+};
+
+struct extent_map {
+ struct rb_node rb_node;
+
+ /* all of these are in bytes */
+ u64 start;
+ u64 len;
+ u64 mod_start;
+ u64 mod_len;
+ u64 orig_start;
+ u64 orig_block_len;
+ u64 ram_bytes;
+ u64 block_start;
+ u64 block_len;
+
+ /*
+ * Generation of the extent map, for merged em it's the highest
+ * generation of all merged ems.
+ * For non-merged extents, it's from btrfs_file_extent_item::generation.
+ */
+ u64 generation;
+ unsigned long flags;
+ /* Used for chunk mappings, flag EXTENT_FLAG_FS_MAPPING must be set */
+ struct map_lookup *map_lookup;
+ refcount_t refs;
+ unsigned int compress_type;
+ struct list_head list;
+};
+
+struct extent_map_tree {
+ struct rb_root_cached map;
+ struct list_head modified_extents;
+ rwlock_t lock;
+};
+
+struct btrfs_inode;
+
+static inline int extent_map_in_tree(const struct extent_map *em)
+{
+ return !RB_EMPTY_NODE(&em->rb_node);
+}
+
+static inline u64 extent_map_end(struct extent_map *em)
+{
+ if (em->start + em->len < em->start)
+ return (u64)-1;
+ return em->start + em->len;
+}
+
+static inline u64 extent_map_block_end(struct extent_map *em)
+{
+ if (em->block_start + em->block_len < em->block_start)
+ return (u64)-1;
+ return em->block_start + em->block_len;
+}
+
+void extent_map_tree_init(struct extent_map_tree *tree);
+struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
+ u64 start, u64 len);
+struct extent_map *btrfs_next_extent_map(const struct extent_map_tree *tree,
+ const struct extent_map *em);
+int add_extent_mapping(struct extent_map_tree *tree,
+ struct extent_map *em, int modified);
+void remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
+void replace_extent_mapping(struct extent_map_tree *tree,
+ struct extent_map *cur,
+ struct extent_map *new,
+ int modified);
+
+struct extent_map *alloc_extent_map(void);
+void free_extent_map(struct extent_map *em);
+int __init extent_map_init(void);
+void __cold extent_map_exit(void);
+int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen);
+void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em);
+struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
+ u64 start, u64 len);
+int btrfs_add_extent_mapping(struct btrfs_fs_info *fs_info,
+ struct extent_map_tree *em_tree,
+ struct extent_map **em_in, u64 start, u64 len);
+void btrfs_drop_extent_map_range(struct btrfs_inode *inode,
+ u64 start, u64 end,
+ bool skip_pinned);
+int btrfs_replace_extent_map_range(struct btrfs_inode *inode,
+ struct extent_map *new_em,
+ bool modified);
+
+#endif