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btrfs-progs
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finish off inode indexing in dirs, add overflows

This commit is contained in:
Chris Mason 2007-04-05 12:13:45 -04:00 committed by David Woodhouse
parent 6542904d95
commit b6414c8ee2
2 changed files with 93 additions and 10 deletions
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75
ctree.h
View File

@ -8,12 +8,19 @@ struct btrfs_trans_handle;
#define BTRFS_MAGIC "_BtRfS_M"
#define BTRFS_ROOT_TREE_OBJECTID 1
#define BTRFS_EXTENT_TREE_OBJECTID 2
#define BTRFS_INODE_MAP_OBJECTID 3
#define BTRFS_FS_TREE_OBJECTID 4
#define BTRFS_FIRST_FREE_OBJECTID 5
#define BTRFS_ROOT_TREE_OBJECTID 1ULL
#define BTRFS_EXTENT_TREE_OBJECTID 2ULL
#define BTRFS_INODE_MAP_OBJECTID 3ULL
#define BTRFS_FS_TREE_OBJECTID 4ULL
#define BTRFS_FIRST_FREE_OBJECTID 5ULL
/*
* we can actually store much bigger names, but lets not confuse the rest
* of linux
*/
#define BTRFS_NAME_LEN 255
/* 32 bytes in various csum fields */
#define BTRFS_CSUM_SIZE 32
/*
@ -258,6 +265,10 @@ struct btrfs_root {
#define BTRFS_KEY_TYPE_MAX 256
#define BTRFS_KEY_TYPE_MASK (BTRFS_KEY_TYPE_MAX - 1)
#define BTRFS_KEY_OVERFLOW_MAX 128
#define BTRFS_KEY_OVERFLOW_SHIFT 8
#define BTRFS_KEY_OVERFLOW_MASK (0x7FULL << BTRFS_KEY_OVERFLOW_SHIFT)
/*
* inode items have the data typically returned from stat and store other
* info about object characteristics. There is one for every file and dir in
@ -280,7 +291,11 @@ struct btrfs_root {
* a (hopefully) huge chunk of disk
*/
#define BTRFS_EXTENT_DATA_KEY 5
/*
* csum items have the checksums for data in the extents
*/
#define BTRFS_CSUM_ITEM_KEY 6
/*
* root items point to tree roots. There are typically in the root
* tree used by the super block to find all the other trees
@ -405,6 +420,27 @@ static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
i->compat_flags = cpu_to_le16(val);
}
static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
{
return le64_to_cpu(ts->sec);
}
static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
u64 val)
{
ts->sec = cpu_to_le64(val);
}
static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
{
return le32_to_cpu(ts->nsec);
}
static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
u32 val)
{
ts->nsec = cpu_to_le32(val);
}
static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
{
@ -551,6 +587,19 @@ static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
disk->flags = cpu_to_le32(val);
}
static inline u32 btrfs_key_overflow(struct btrfs_key *key)
{
u32 over = key->flags & BTRFS_KEY_OVERFLOW_MASK;
return over >> BTRFS_KEY_OVERFLOW_SHIFT;
}
static inline void btrfs_set_key_overflow(struct btrfs_key *key, u32 over)
{
BUG_ON(over >= BTRFS_KEY_OVERFLOW_MAX);
over = over << BTRFS_KEY_OVERFLOW_SHIFT;
key->flags = (key->flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
}
static inline u32 btrfs_key_type(struct btrfs_key *key)
{
return key->flags & BTRFS_KEY_TYPE_MASK;
@ -575,6 +624,22 @@ static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key, u32 type)
btrfs_set_disk_key_flags(key, flags);
}
static inline u32 btrfs_disk_key_overflow(struct btrfs_disk_key *key)
{
u32 over = le32_to_cpu(key->flags) & BTRFS_KEY_OVERFLOW_MASK;
return over >> BTRFS_KEY_OVERFLOW_SHIFT;
}
static inline void btrfs_set_disK_key_overflow(struct btrfs_disk_key *key,
u32 over)
{
u32 flags = btrfs_disk_key_flags(key);
BUG_ON(over >= BTRFS_KEY_OVERFLOW_MAX);
over = over << BTRFS_KEY_OVERFLOW_SHIFT;
flags = (flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
btrfs_set_disk_key_flags(key, flags);
}
static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
{
return le64_to_cpu(h->blocknr);

28
dir-item.c
View File

@ -7,6 +7,26 @@
#include "hash.h"
#include "transaction.h"
int insert_with_overflow(struct btrfs_trans_handle *trans, struct btrfs_root
*root, struct btrfs_path *path, struct btrfs_key
*cpu_key, u32 data_size)
{
int overflow;
int ret;
ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size);
overflow = btrfs_key_overflow(cpu_key);
while(ret == -EEXIST && overflow < BTRFS_KEY_OVERFLOW_MAX) {
overflow++;
btrfs_set_key_overflow(cpu_key, overflow);
btrfs_release_path(root, path);
ret = btrfs_insert_empty_item(trans, root, path, cpu_key,
data_size);
}
return ret;
}
int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
*root, char *name, int name_len, u64 dir, u64
objectid, u8 type)
@ -30,7 +50,7 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
BUG_ON(ret);
btrfs_init_path(&path);
data_size = sizeof(*dir_item) + name_len;
ret = btrfs_insert_empty_item(trans, root, &path, &key, data_size);
ret = insert_with_overflow(trans, root, &path, &key, data_size);
if (ret)
goto out;
@ -43,13 +63,10 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
name_ptr = (char *)(dir_item + 1);
memcpy(name_ptr, name, name_len);
// FIXME don't be stupid
if (key.offset == 2)
goto out;
btrfs_release_path(root, &path);
btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
key.offset = objectid;
ret = btrfs_insert_empty_item(trans, root, &path, &key, data_size);
ret = insert_with_overflow(trans, root, &path, &key, data_size);
if (ret)
goto out;
@ -78,6 +95,7 @@ int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
key.objectid = dir;
key.flags = 0;
btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
btrfs_set_key_overflow(&key, BTRFS_KEY_OVERFLOW_MAX);
ret = btrfs_name_hash(name, name_len, &key.offset);
BUG_ON(ret);
ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);