Btrfs: finish off inode indexing in dirs, add overflows
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
parent
5f26f772e5
commit
7fcde0e329
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@ -270,6 +270,10 @@ struct btrfs_root {
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#define BTRFS_KEY_TYPE_MAX 256
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#define BTRFS_KEY_TYPE_MASK (BTRFS_KEY_TYPE_MAX - 1)
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#define BTRFS_KEY_OVERFLOW_MAX 128
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#define BTRFS_KEY_OVERFLOW_SHIFT 8
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#define BTRFS_KEY_OVERFLOW_MASK (0x7FULL << BTRFS_KEY_OVERFLOW_SHIFT)
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/*
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* inode items have the data typically returned from stat and store other
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* info about object characteristics. There is one for every file and dir in
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@ -588,6 +592,19 @@ static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
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disk->flags = cpu_to_le32(val);
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}
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static inline u32 btrfs_key_overflow(struct btrfs_key *key)
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{
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u32 over = key->flags & BTRFS_KEY_OVERFLOW_MASK;
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return over >> BTRFS_KEY_OVERFLOW_SHIFT;
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}
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static inline void btrfs_set_key_overflow(struct btrfs_key *key, u32 over)
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{
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BUG_ON(over > BTRFS_KEY_OVERFLOW_MAX);
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over = over << BTRFS_KEY_OVERFLOW_SHIFT;
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key->flags = (key->flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
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}
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static inline u32 btrfs_key_type(struct btrfs_key *key)
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{
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return key->flags & BTRFS_KEY_TYPE_MASK;
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@ -612,6 +629,22 @@ static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key, u32 type)
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btrfs_set_disk_key_flags(key, flags);
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}
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static inline u32 btrfs_disk_key_overflow(struct btrfs_disk_key *key)
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{
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u32 over = le32_to_cpu(key->flags) & BTRFS_KEY_OVERFLOW_MASK;
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return over >> BTRFS_KEY_OVERFLOW_SHIFT;
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}
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static inline void btrfs_set_disK_key_overflow(struct btrfs_disk_key *key,
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u32 over)
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{
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u32 flags = btrfs_disk_key_flags(key);
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BUG_ON(over > BTRFS_KEY_OVERFLOW_MAX);
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over = over << BTRFS_KEY_OVERFLOW_SHIFT;
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flags = (flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
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btrfs_set_disk_key_flags(key, flags);
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}
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static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
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{
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return le64_to_cpu(h->blocknr);
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@ -4,6 +4,26 @@
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#include "hash.h"
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#include "transaction.h"
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int insert_with_overflow(struct btrfs_trans_handle *trans, struct btrfs_root
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*root, struct btrfs_path *path, struct btrfs_key
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*cpu_key, u32 data_size)
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{
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int overflow;
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int ret;
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ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size);
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overflow = btrfs_key_overflow(cpu_key);
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while(ret == -EEXIST && overflow < BTRFS_KEY_OVERFLOW_MAX) {
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overflow++;
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btrfs_set_key_overflow(cpu_key, overflow);
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btrfs_release_path(root, path);
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ret = btrfs_insert_empty_item(trans, root, path, cpu_key,
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data_size);
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}
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return ret;
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}
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int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
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*root, const char *name, int name_len, u64 dir, u64
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objectid, u8 type)
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@ -23,7 +43,7 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
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path = btrfs_alloc_path();
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btrfs_init_path(path);
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data_size = sizeof(*dir_item) + name_len;
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ret = btrfs_insert_empty_item(trans, root, path, &key, data_size);
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ret = insert_with_overflow(trans, root, path, &key, data_size);
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if (ret)
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goto out;
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@ -41,7 +61,7 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
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btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
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key.offset = objectid;
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ret = btrfs_insert_empty_item(trans, root, path, &key, data_size);
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ret = insert_with_overflow(trans, root, path, &key, data_size);
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// FIXME clear the dirindex bit
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if (ret)
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goto out;
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@ -70,14 +90,40 @@ int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
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struct btrfs_key key;
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int ins_len = mod < 0 ? -1 : 0;
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int cow = mod != 0;
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struct btrfs_disk_key *found_key;
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struct btrfs_leaf *leaf;
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key.objectid = dir;
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key.flags = 0;
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btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
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btrfs_set_key_overflow(&key, BTRFS_KEY_OVERFLOW_MAX - 1);
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ret = btrfs_name_hash(name, name_len, &key.offset);
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BUG_ON(ret);
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ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
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return ret;
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while(1) {
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ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
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if (ret < 0)
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return ret;
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if (ret > 0) {
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if (path->slots[0] == 0)
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return 1;
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path->slots[0]--;
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}
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leaf = btrfs_buffer_leaf(path->nodes[0]);
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found_key = &leaf->items[path->slots[0]].key;
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if (btrfs_disk_key_objectid(found_key) != dir ||
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btrfs_disk_key_type(found_key) != BTRFS_DIR_ITEM_KEY ||
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btrfs_disk_key_offset(found_key) != key.offset)
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return 1;
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if (btrfs_match_dir_item_name(root, path, name, name_len))
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return 0;
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if (btrfs_disk_key_overflow(found_key) == 0)
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return 1;
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btrfs_release_path(root, path);
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}
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return 1;
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}
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int btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
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@ -89,13 +135,31 @@ int btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
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struct btrfs_key key;
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int ins_len = mod < 0 ? -1 : 0;
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int cow = mod != 0;
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struct btrfs_disk_key *found_key;
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struct btrfs_leaf *leaf;
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key.objectid = dir;
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key.flags = 0;
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btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
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btrfs_set_key_overflow(&key, BTRFS_KEY_OVERFLOW_MAX - 1);
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key.offset = objectid;
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ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
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return ret;
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if (ret < 0)
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return ret;
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if (ret > 0) {
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if (path->slots[0] == 0)
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return 1;
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path->slots[0]--;
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}
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leaf = btrfs_buffer_leaf(path->nodes[0]);
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found_key = &leaf->items[path->slots[0]].key;
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if (btrfs_disk_key_objectid(found_key) != dir ||
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btrfs_disk_key_type(found_key) != BTRFS_DIR_INDEX_KEY)
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return 1;
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if (btrfs_disk_key_offset(found_key) == objectid)
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return 0;
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return 1;
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}
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int btrfs_match_dir_item_name(struct btrfs_root *root,
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@ -486,19 +486,18 @@ static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
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continue;
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if (btrfs_disk_key_offset(&item->key) < filp->f_pos)
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continue;
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filp->f_pos = btrfs_disk_key_offset(&item->key);
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advance = 1;
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di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
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over = filldir(dirent, (const char *)(di + 1),
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btrfs_dir_name_len(di),
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btrfs_disk_key_offset(&item->key),
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btrfs_dir_objectid(di), d_type);
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if (over) {
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filp->f_pos = btrfs_disk_key_offset(&item->key);
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break;
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}
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filp->f_pos = btrfs_disk_key_offset(&item->key) + 1;
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if (over)
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goto nopos;
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}
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filp->f_pos++;
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nopos:
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ret = 0;
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err:
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btrfs_release_path(root, path);
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