From 7e38180e207c8707691c12395e990a5d583c5e71 Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Thu, 19 Apr 2007 15:36:27 -0400 Subject: Btrfs: directory inode index is back Signed-off-by: Chris Mason --- fs/btrfs/TODO | 4 +- fs/btrfs/ctree.h | 58 +++------- fs/btrfs/dir-item.c | 204 ++++++++++++++++++++++++----------- fs/btrfs/super.c | 302 ++++++++-------------------------------------------- 4 files changed, 206 insertions(+), 362 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/TODO b/fs/btrfs/TODO index 1c3acfcf146e..8d7e5a3ed629 100644 --- a/fs/btrfs/TODO +++ b/fs/btrfs/TODO @@ -1,12 +1,12 @@ * cleanup, add more error checking, get rid of BUG_ONs * Fix ENOSPC handling -* Add block mapping tree (simple dm layer) * Make allocator smarter * add a block group to struct inode -* Make sure nobh stuff is working properly for cows * Do actual block accounting * Check compat and incompat flags on the inode * Get rid of struct ctree_path, limiting tree levels held at one time +* Add generation number to key pointer in nodes +* Add parent pointer back to extent map. * Release * Do real tree locking * Add extent mirroring (backup copies of blocks) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index f1800008be34..d628a3b9441c 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -185,11 +185,6 @@ struct btrfs_inode_item { struct btrfs_inode_timespec otime; } __attribute__ ((__packed__)); -/* inline data is just a blob of bytes */ -struct btrfs_inline_data_item { - u8 data; -} __attribute__ ((__packed__)); - struct btrfs_dir_item { struct btrfs_disk_key location; __le16 flags; @@ -293,9 +288,6 @@ struct btrfs_root { #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \ BTRFS_KEY_TYPE_SHIFT) -#define BTRFS_KEY_OVERFLOW_MAX 128 -#define BTRFS_KEY_OVERFLOW_MASK ((u32)BTRFS_KEY_OVERFLOW_MAX - 1) - /* * 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 @@ -621,31 +613,6 @@ static inline void btrfs_set_key_type(struct btrfs_key *key, u32 val) key->flags = (key->flags & ~(BTRFS_KEY_TYPE_MASK)) | val; } -static inline u32 btrfs_key_overflow(struct btrfs_key *key) -{ - return key->flags & BTRFS_KEY_OVERFLOW_MASK; -} - -static inline void btrfs_set_key_overflow(struct btrfs_key *key, u32 over) -{ - BUG_ON(over >= BTRFS_KEY_OVERFLOW_MAX); - key->flags = (key->flags & ~BTRFS_KEY_OVERFLOW_MASK) | over; -} - -static inline u32 btrfs_disk_key_overflow(struct btrfs_disk_key *key) -{ - return le32_to_cpu(key->flags) & BTRFS_KEY_OVERFLOW_MASK; -} - -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); - flags = (flags & ~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); @@ -1079,15 +1046,24 @@ int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root *root, const char *name, int name_len, u64 dir, struct btrfs_key *location, u8 type); -int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root - *root, struct btrfs_path *path, u64 dir, - const char *name, int name_len, int mod); -int btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - struct btrfs_path *path, u64 dir, - u64 objectid, int mod); -int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path, +struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, u64 dir, + const char *name, int name_len, + int mod); +struct btrfs_dir_item * +btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, u64 dir, + u64 objectid, const char *name, int name_len, + int mod); +struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root, + struct btrfs_path *path, const char *name, int name_len); +int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, + struct btrfs_dir_item *di); /* inode-map.c */ int btrfs_find_free_objectid(struct btrfs_trans_handle *trans, struct btrfs_root *fs_root, diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c index a43deb726486..7a7e9846860a 100644 --- a/fs/btrfs/dir-item.c +++ b/fs/btrfs/dir-item.c @@ -4,24 +4,31 @@ #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) +struct btrfs_dir_item *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; + char *ptr; + struct btrfs_item *item; + struct btrfs_leaf *leaf; 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); + if (ret == -EEXIST) { + ret = btrfs_extend_item(trans, root, path, data_size); + WARN_ON(ret > 0); + if (ret) + return ERR_PTR(ret); } - return ret; + WARN_ON(ret > 0); + leaf = btrfs_buffer_leaf(path->nodes[0]); + item = leaf->items + path->slots[0]; + ptr = btrfs_item_ptr(leaf, path->slots[0], char); + BUG_ON(data_size > btrfs_item_size(item)); + ptr += btrfs_item_size(item) - data_size; + return (struct btrfs_dir_item *)ptr; } int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root @@ -43,13 +50,12 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root path = btrfs_alloc_path(); btrfs_init_path(path); data_size = sizeof(*dir_item) + name_len; - ret = insert_with_overflow(trans, root, path, &key, data_size); - if (ret) + dir_item = insert_with_overflow(trans, root, path, &key, data_size); + if (IS_ERR(dir_item)) { + ret = PTR_ERR(dir_item); goto out; + } - dir_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), - path->slots[0], - struct btrfs_dir_item); btrfs_cpu_key_to_disk(&dir_item->location, location); btrfs_set_dir_type(dir_item, type); btrfs_set_dir_flags(dir_item, 0); @@ -58,15 +64,39 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root btrfs_memcpy(root, path->nodes[0]->b_data, name_ptr, name, name_len); btrfs_mark_buffer_dirty(path->nodes[0]); -out: + + /* FIXME, use some real flag for selecting the extra index */ + if (root == root->fs_info->tree_root) { + ret = 0; + goto out; + } + btrfs_release_path(root, path); + + btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY); + key.offset = location->objectid; + dir_item = insert_with_overflow(trans, root, path, &key, data_size); + if (IS_ERR(dir_item)) { + ret = PTR_ERR(dir_item); + goto out; + } + btrfs_cpu_key_to_disk(&dir_item->location, location); + btrfs_set_dir_type(dir_item, type); + btrfs_set_dir_flags(dir_item, 0); + btrfs_set_dir_name_len(dir_item, name_len); + name_ptr = (char *)(dir_item + 1); + btrfs_memcpy(root, path->nodes[0]->b_data, name_ptr, name, name_len); + btrfs_mark_buffer_dirty(path->nodes[0]); +out: btrfs_free_path(path); return ret; } -int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root - *root, struct btrfs_path *path, u64 dir, - const char *name, int name_len, int mod) +struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, u64 dir, + const char *name, int name_len, + int mod) { int ret; struct btrfs_key key; @@ -74,57 +104,111 @@ int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root int cow = mod != 0; struct btrfs_disk_key *found_key; struct btrfs_leaf *leaf; - u32 overflow; key.objectid = dir; key.flags = 0; btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); - // btrfs_set_key_overflow(&key, BTRFS_KEY_OVERFLOW_MAX - 1); ret = btrfs_name_hash(name, name_len, &key.offset); BUG_ON(ret); - while(1) { - ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); - if (ret < 0) - return ret; - if (ret > 0) { - if (path->slots[0] == 0) - return 1; - path->slots[0]--; - } - leaf = btrfs_buffer_leaf(path->nodes[0]); - found_key = &leaf->items[path->slots[0]].key; - - if (btrfs_disk_key_objectid(found_key) != dir || - btrfs_disk_key_type(found_key) != BTRFS_DIR_ITEM_KEY || - btrfs_disk_key_offset(found_key) != key.offset) - return 1; - - if (btrfs_match_dir_item_name(root, path, name, name_len)) - return 0; - - overflow = btrfs_disk_key_overflow(found_key); - if (overflow == 0) - return 1; - btrfs_set_key_overflow(&key, overflow - 1); - btrfs_release_path(root, path); + ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); + if (ret < 0) + return ERR_PTR(ret); + if (ret > 0) { + if (path->slots[0] == 0) + return NULL; + path->slots[0]--; } - return 1; + leaf = btrfs_buffer_leaf(path->nodes[0]); + found_key = &leaf->items[path->slots[0]].key; + + if (btrfs_disk_key_objectid(found_key) != dir || + btrfs_disk_key_type(found_key) != BTRFS_DIR_ITEM_KEY || + btrfs_disk_key_offset(found_key) != key.offset) + return NULL; + + return btrfs_match_dir_item_name(root, path, name, name_len); } -int btrfs_match_dir_item_name(struct btrfs_root *root, +struct btrfs_dir_item * +btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, u64 dir, + u64 objectid, const char *name, int name_len, + int mod) +{ + int ret; + struct btrfs_key key; + int ins_len = mod < 0 ? -1 : 0; + int cow = mod != 0; + + key.objectid = dir; + key.flags = 0; + btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY); + key.offset = objectid; + + ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); + if (ret < 0) + return ERR_PTR(ret); + if (ret > 0) + return ERR_PTR(-ENOENT); + return btrfs_match_dir_item_name(root, path, name, name_len); +} + +struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path, const char *name, int name_len) { struct btrfs_dir_item *dir_item; char *name_ptr; + u32 total_len; + u32 cur = 0; + u32 this_len; + struct btrfs_leaf *leaf; - dir_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), - path->slots[0], - struct btrfs_dir_item); - if (btrfs_dir_name_len(dir_item) != name_len) - return 0; - name_ptr = (char *)(dir_item + 1); - if (memcmp(name_ptr, name, name_len)) - return 0; - return 1; + leaf = btrfs_buffer_leaf(path->nodes[0]); + dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item); + total_len = btrfs_item_size(leaf->items + path->slots[0]); + while(cur < total_len) { + this_len = sizeof(*dir_item) + btrfs_dir_name_len(dir_item); + name_ptr = (char *)(dir_item + 1); + + if (btrfs_dir_name_len(dir_item) == name_len && + memcmp(name_ptr, name, name_len) == 0) + return dir_item; + + cur += this_len; + dir_item = (struct btrfs_dir_item *)((char *)dir_item + + this_len); + } + return NULL; } + +int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, + struct btrfs_dir_item *di) +{ + + struct btrfs_leaf *leaf; + u32 sub_item_len; + u32 item_len; + int ret; + + leaf = btrfs_buffer_leaf(path->nodes[0]); + sub_item_len = sizeof(*di) + btrfs_dir_name_len(di); + item_len = btrfs_item_size(leaf->items + path->slots[0]); + if (sub_item_len == btrfs_item_size(leaf->items + path->slots[0])) { + ret = btrfs_del_item(trans, root, path); + BUG_ON(ret); + } else { + char *ptr = (char *)di; + char *start = btrfs_item_ptr(leaf, path->slots[0], char); + btrfs_memmove(root, leaf, ptr, ptr + sub_item_len, + item_len - (ptr + sub_item_len - start)); + ret = btrfs_truncate_item(trans, root, path, + item_len - sub_item_len); + BUG_ON(ret); + } + return 0; +} + diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 1b286bb26f12..dff2db0d1dc2 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -127,32 +127,43 @@ static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, struct btrfs_path *path; const char *name = dentry->d_name.name; int name_len = dentry->d_name.len; - int ret; + int ret = 0; u64 objectid; struct btrfs_dir_item *di; path = btrfs_alloc_path(); BUG_ON(!path); btrfs_init_path(path); - ret = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, + di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, name, name_len, -1); - if (ret < 0) + if (IS_ERR(di)) { + ret = PTR_ERR(di); goto err; - if (ret > 0) { + } + if (!di) { ret = -ENOENT; goto err; } - di = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], - struct btrfs_dir_item); objectid = btrfs_disk_key_objectid(&di->location); + ret = btrfs_delete_one_dir_name(trans, root, path, di); + BUG_ON(ret); + btrfs_release_path(root, path); - ret = btrfs_del_item(trans, root, path); + di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, + objectid, name, name_len, -1); + if (IS_ERR(di)) { + ret = PTR_ERR(di); + goto err; + } + if (!di) { + ret = -ENOENT; + goto err; + } + ret = btrfs_delete_one_dir_name(trans, root, path, di); BUG_ON(ret); - btrfs_release_path(root, path); dentry->d_inode->i_ctime = dir->i_ctime; err: - btrfs_release_path(root, path); btrfs_free_path(path); if (ret == 0) { inode_dec_link_count(dentry->d_inode); @@ -388,15 +399,13 @@ static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, path = btrfs_alloc_path(); BUG_ON(!path); btrfs_init_path(path); - ret = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, + di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, namelen, 0); - if (ret || !btrfs_match_dir_item_name(root, path, name, namelen)) { + if (!di || IS_ERR(di)) { location->objectid = 0; ret = 0; goto out; } - di = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], - struct btrfs_dir_item); btrfs_disk_key_to_cpu(location, &di->location); out: btrfs_release_path(root, path); @@ -523,7 +532,10 @@ static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) int advance; unsigned char d_type = DT_UNKNOWN; int over = 0; - int key_type = BTRFS_DIR_ITEM_KEY; + u32 di_cur; + u32 di_total; + u32 di_len; + int key_type = BTRFS_DIR_INDEX_KEY; /* FIXME, use a real flag for deciding about the key type */ if (root->fs_info->tree_root == root) @@ -567,12 +579,20 @@ static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) filp->f_pos = btrfs_disk_key_offset(&item->key); advance = 1; di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); - over = filldir(dirent, (const char *)(di + 1), - btrfs_dir_name_len(di), - btrfs_disk_key_offset(&item->key), - btrfs_disk_key_objectid(&di->location), d_type); - if (over) - goto nopos; + di_cur = 0; + di_total = btrfs_item_size(leaf->items + slot); + while(di_cur < di_total) { + over = filldir(dirent, (const char *)(di + 1), + btrfs_dir_name_len(di), + btrfs_disk_key_offset(&item->key), + btrfs_disk_key_objectid(&di->location), + d_type); + if (over) + goto nopos; + di_len = btrfs_dir_name_len(di) + sizeof(*di); + di_cur += di_len; + di = (struct btrfs_dir_item *)((char *)di + di_len); + } } filp->f_pos++; nopos: @@ -935,75 +955,6 @@ printk("btrfs sync_fs\n"); return 0; } -#if 0 -static int btrfs_get_block_inline(struct inode *inode, sector_t iblock, - struct buffer_head *result, int create) -{ - struct btrfs_root *root = btrfs_sb(inode->i_sb); - struct btrfs_path *path; - struct btrfs_key key; - struct btrfs_leaf *leaf; - int num_bytes = result->b_size; - int item_size; - int ret; - u64 pos; - char *ptr; - int copy_size; - int err = 0; - char *safe_ptr; - char *data_ptr; - - path = btrfs_alloc_path(); - BUG_ON(!path); - - WARN_ON(create); - if (create) { - return 0; - } - pos = iblock << inode->i_blkbits; - key.objectid = inode->i_ino; - key.flags = 0; - btrfs_set_key_type(&key, BTRFS_INLINE_DATA_KEY); - ptr = kmap(result->b_page); - safe_ptr = ptr; - ptr += (pos & (PAGE_CACHE_SIZE -1)); -again: - key.offset = pos; - ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); - if (ret) { - if (ret < 0) - err = ret; - else - err = 0; - goto out; - } - leaf = btrfs_buffer_leaf(path->nodes[0]); - item_size = btrfs_item_size(leaf->items + path->slots[0]); - copy_size = min(num_bytes, item_size); - data_ptr = btrfs_item_ptr(leaf, path->slots[0], char); - WARN_ON(safe_ptr + PAGE_CACHE_SIZE < ptr + copy_size); - memcpy(ptr, data_ptr, copy_size); - pos += copy_size; - num_bytes -= copy_size; - WARN_ON(num_bytes < 0); - ptr += copy_size; - btrfs_release_path(root, path); - if (num_bytes != 0) { - if (pos >= i_size_read(inode)) - memset(ptr, 0, num_bytes); - else - goto again; - } - set_buffer_uptodate(result); - map_bh(result, inode->i_sb, 0); - err = 0; -out: - btrfs_free_path(path); - kunmap(result->b_page); - return err; -} -#endif - static int btrfs_get_block_lock(struct inode *inode, sector_t iblock, struct buffer_head *result, int create) { @@ -1907,174 +1858,6 @@ out: return num_written ? num_written : err; } -#if 0 -static ssize_t inline_one_page(struct btrfs_root *root, struct inode *inode, - struct page *page, loff_t pos, - size_t offset, size_t write_bytes) -{ - struct btrfs_path *path; - struct btrfs_trans_handle *trans; - struct btrfs_key key; - struct btrfs_leaf *leaf; - struct btrfs_key found_key; - int ret; - size_t copy_size = 0; - char *dst = NULL; - int err = 0; - size_t num_written = 0; - - path = btrfs_alloc_path(); - BUG_ON(!path); - mutex_lock(&root->fs_info->fs_mutex); - trans = btrfs_start_transaction(root, 1); - key.objectid = inode->i_ino; - key.flags = 0; - btrfs_set_key_type(&key, BTRFS_INLINE_DATA_KEY); - -again: - key.offset = pos; - ret = btrfs_search_slot(trans, root, &key, path, 0, 1); - if (ret < 0) { - err = ret; - goto out; - } - if (ret == 0) { - leaf = btrfs_buffer_leaf(path->nodes[0]); - btrfs_disk_key_to_cpu(&found_key, - &leaf->items[path->slots[0]].key); - copy_size = btrfs_item_size(leaf->items + path->slots[0]); - dst = btrfs_item_ptr(leaf, path->slots[0], char); - copy_size = min(write_bytes, copy_size); - goto copyit; - } else { - int slot = path->slots[0]; - if (slot > 0) { - slot--; - } - // FIXME find max key - leaf = btrfs_buffer_leaf(path->nodes[0]); - btrfs_disk_key_to_cpu(&found_key, - &leaf->items[slot].key); - if (found_key.objectid != inode->i_ino) - goto insert; - if (btrfs_key_type(&found_key) != BTRFS_INLINE_DATA_KEY) - goto insert; - copy_size = btrfs_item_size(leaf->items + slot); - if (found_key.offset + copy_size <= pos) - goto insert; - dst = btrfs_item_ptr(leaf, path->slots[0], char); - dst += pos - found_key.offset; - copy_size = copy_size - (pos - found_key.offset); - BUG_ON(copy_size < 0); - copy_size = min(write_bytes, copy_size); - WARN_ON(copy_size == 0); - goto copyit; - } -insert: - btrfs_release_path(root, path); - copy_size = min(write_bytes, - (size_t)BTRFS_LEAF_DATA_SIZE(root) - - sizeof(struct btrfs_item) * 4); - ret = btrfs_insert_empty_item(trans, root, path, &key, copy_size); - BUG_ON(ret); - dst = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), - path->slots[0], char); -copyit: - WARN_ON(copy_size == 0); - WARN_ON(dst + copy_size > - btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), - path->slots[0], char) + - btrfs_item_size(btrfs_buffer_leaf(path->nodes[0])->items + - path->slots[0])); - btrfs_memcpy(root, path->nodes[0]->b_data, dst, - page_address(page) + offset, copy_size); - mark_buffer_dirty(path->nodes[0]); - btrfs_release_path(root, path); - pos += copy_size; - offset += copy_size; - num_written += copy_size; - write_bytes -= copy_size; - if (write_bytes) - goto again; -out: - btrfs_free_path(path); - ret = btrfs_end_transaction(trans, root); - BUG_ON(ret); - mutex_unlock(&root->fs_info->fs_mutex); - return num_written ? num_written : err; -} - -static ssize_t btrfs_file_inline_write(struct file *file, - const char __user *buf, - size_t count, loff_t *ppos) -{ - loff_t pos; - size_t num_written = 0; - int err = 0; - int ret = 0; - struct inode *inode = file->f_path.dentry->d_inode; - struct btrfs_root *root = BTRFS_I(inode)->root; - unsigned long page_index; - - if (file->f_flags & O_DIRECT) - return -EINVAL; - pos = *ppos; - - vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); - current->backing_dev_info = inode->i_mapping->backing_dev_info; - err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); - if (err) - goto out; - if (count == 0) - goto out; - err = remove_suid(file->f_path.dentry); - if (err) - goto out; - file_update_time(file); - mutex_lock(&inode->i_mutex); - while(count > 0) { - size_t offset = pos & (PAGE_CACHE_SIZE - 1); - size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset); - struct page *page; - - page_index = pos >> PAGE_CACHE_SHIFT; - page = grab_cache_page(inode->i_mapping, page_index); - if (!PageUptodate(page)) { - ret = mpage_readpage(page, btrfs_get_block); - BUG_ON(ret); - lock_page(page); - } - ret = btrfs_copy_from_user(pos, 1, - write_bytes, &page, buf); - BUG_ON(ret); - write_bytes = inline_one_page(root, inode, page, pos, - offset, write_bytes); - SetPageUptodate(page); - if (write_bytes > 0 && pos + write_bytes > inode->i_size) { - i_size_write(inode, pos + write_bytes); - mark_inode_dirty(inode); - } - page_cache_release(page); - unlock_page(page); - if (write_bytes < 0) - goto out_unlock; - buf += write_bytes; - count -= write_bytes; - pos += write_bytes; - num_written += write_bytes; - - balance_dirty_pages_ratelimited(inode->i_mapping); - cond_resched(); - } -out_unlock: - mutex_unlock(&inode->i_mutex); -out: - *ppos = pos; - current->backing_dev_info = NULL; - return num_written ? num_written : err; -} -#endif - static int btrfs_read_actor(read_descriptor_t *desc, struct page *page, unsigned long offset, unsigned long size) { @@ -2422,6 +2205,7 @@ static int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int struct btrfs_root *root = BTRFS_I(inode)->root; struct btrfs_ioctl_vol_args vol_args; int ret = 0; + struct btrfs_dir_item *di; int namelen; struct btrfs_path *path; u64 root_dirid; @@ -2440,12 +2224,12 @@ static int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int return -ENOMEM; root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, mutex_lock(&root->fs_info->fs_mutex); - ret = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, + di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, root_dirid, vol_args.name, namelen, 0); mutex_unlock(&root->fs_info->fs_mutex); btrfs_free_path(path); - if (ret == 0) + if (di && !IS_ERR(di)) return -EEXIST; if (root == root->fs_info->tree_root) -- cgit v1.2.1