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btrfs-progs: Basic support for extended inode refs 

This patch syncs the extended inode ref definitions from kernels ctree.h and
adds support in btrfs-debug-tree for visualizing the state of extended refs
on disk.

Signed-off-by: Mark Fasheh <mfasheh@suse.de>
This commit is contained in:
Mark Fasheh 2012-06-07 16:00:54 -07:00 committed by David Sterba
parent 73355a60aa
commit 905b078928
2 changed files with 70 additions and 1 deletions
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27
ctree.h
View File

@ -122,6 +122,13 @@ struct btrfs_trans_handle;
*/
#define BTRFS_NAME_LEN 255
/*
* Theoretical limit is larger, but we keep this down to a sane
* value. That should limit greatly the possibility of collisions on
* inode ref items.
*/
#define BTRFS_LINK_MAX 65535U
/* 32 bytes in various csum fields */
#define BTRFS_CSUM_SIZE 32
@ -424,6 +431,7 @@ struct btrfs_super_block {
#define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1)
#define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2)
#define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO (1ULL << 3)
/*
* some patches floated around with a second compression method
* lets save that incompat here for when they do get in
@ -438,6 +446,7 @@ struct btrfs_super_block {
*/
#define BTRFS_FEATURE_INCOMPAT_BIG_METADATA (1ULL << 5)
#define BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF (1ULL << 6)
#define BTRFS_FEATURE_COMPAT_SUPP 0ULL
#define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL
@ -446,7 +455,8 @@ struct btrfs_super_block {
BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS)
BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
/*
* A leaf is full of items. offset and size tell us where to find
@ -585,6 +595,13 @@ struct btrfs_inode_ref {
/* name goes here */
} __attribute__ ((__packed__));
struct btrfs_inode_extref {
__le64 parent_objectid;
__le64 index;
__le16 name_len;
__u8 name[0]; /* name goes here */
} __attribute__ ((__packed__));
struct btrfs_timespec {
__le64 sec;
__le32 nsec;
@ -960,6 +977,7 @@ struct btrfs_root {
*/
#define BTRFS_INODE_ITEM_KEY 1
#define BTRFS_INODE_REF_KEY 12
#define BTRFS_INODE_EXTREF_KEY 13
#define BTRFS_XATTR_ITEM_KEY 24
#define BTRFS_ORPHAN_ITEM_KEY 48
@ -1259,6 +1277,13 @@ BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
BTRFS_SETGET_STACK_FUNCS(stack_inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
/* struct btrfs_inode_extref */
BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
parent_objectid, 64);
BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
name_len, 16);
BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
/* struct btrfs_inode_item */
BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);

44
print-tree.c
View File

@ -61,6 +61,42 @@ static int print_dir_item(struct extent_buffer *eb, struct btrfs_item *item,
return 0;
}
static int print_inode_extref_item(struct extent_buffer *eb,
struct btrfs_item *item,
struct btrfs_inode_extref *extref)
{
u32 total;
u32 cur = 0;
u32 len;
u32 name_len = 0;
u64 index = 0;
u64 parent_objid;
char namebuf[BTRFS_NAME_LEN];
total = btrfs_item_size(eb, item);
while (cur < total) {
index = btrfs_inode_extref_index(eb, extref);
name_len = btrfs_inode_extref_name_len(eb, extref);
parent_objid = btrfs_inode_extref_parent(eb, extref);
len = (name_len <= sizeof(namebuf))? name_len: sizeof(namebuf);
read_extent_buffer(eb, namebuf, (unsigned long)(extref->name), len);
printf("\t\tinode extref index %llu parent %llu namelen %u "
"name: %.*s\n",
(unsigned long long)index,
(unsigned long long)parent_objid,
name_len, len, namebuf);
len = sizeof(*extref) + name_len;
extref = (struct btrfs_inode_extref *)((char *)extref + len);
cur += len;
}
return 0;
}
static int print_inode_ref_item(struct extent_buffer *eb, struct btrfs_item *item,
struct btrfs_inode_ref *ref)
{
@ -371,6 +407,9 @@ static void print_key_type(u64 objectid, u8 type)
case BTRFS_INODE_REF_KEY:
printf("INODE_REF");
break;
case BTRFS_INODE_EXTREF_KEY:
printf("INODE_EXTREF");
break;
case BTRFS_DIR_ITEM_KEY:
printf("DIR_ITEM");
break;
@ -582,6 +621,7 @@ void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
struct btrfs_extent_data_ref *dref;
struct btrfs_shared_data_ref *sref;
struct btrfs_inode_ref *iref;
struct btrfs_inode_extref *iref2;
struct btrfs_dev_extent *dev_extent;
struct btrfs_disk_key disk_key;
struct btrfs_block_group_item bg_item;
@ -629,6 +669,10 @@ void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
iref = btrfs_item_ptr(l, i, struct btrfs_inode_ref);
print_inode_ref_item(l, item, iref);
break;
case BTRFS_INODE_EXTREF_KEY:
iref2 = btrfs_item_ptr(l, i, struct btrfs_inode_extref);
print_inode_extref_item(l, item, iref2);
break;
case BTRFS_DIR_ITEM_KEY:
case BTRFS_DIR_INDEX_KEY:
case BTRFS_XATTR_ITEM_KEY: