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author | Yan Zheng <zheng.yan@oracle.com> | 2008-10-30 14:25:28 -0400 |
---|---|---|
committer | Chris Mason <chris.mason@oracle.com> | 2008-10-30 14:25:28 -0400 |
commit | d899e05215178fed903ad0e7fc1cb4d8e0cc0a88 (patch) | |
tree | 2969e3558f5c50ec0f9ac4201099c0d5d1d6e2c2 /fs/btrfs/inode.c | |
parent | 80ff385665b7fca29fefe358a60ab0d09f9b8e87 (diff) | |
download | kernel_samsung_espresso10-d899e05215178fed903ad0e7fc1cb4d8e0cc0a88.zip kernel_samsung_espresso10-d899e05215178fed903ad0e7fc1cb4d8e0cc0a88.tar.gz kernel_samsung_espresso10-d899e05215178fed903ad0e7fc1cb4d8e0cc0a88.tar.bz2 |
Btrfs: Add fallocate support v2
This patch updates btrfs-progs for fallocate support.
fallocate is a little different in Btrfs because we need to tell the
COW system that a given preallocated extent doesn't need to be
cow'd as long as there are no snapshots of it. This leverages the
-o nodatacow checks.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Diffstat (limited to 'fs/btrfs/inode.c')
-rw-r--r-- | fs/btrfs/inode.c | 323 |
1 files changed, 252 insertions, 71 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 3e6f056..789c376 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -37,6 +37,7 @@ #include <linux/version.h> #include <linux/xattr.h> #include <linux/posix_acl.h> +#include <linux/falloc.h> #include "ctree.h" #include "disk-io.h" #include "transaction.h" @@ -587,7 +588,7 @@ free_pages_out: * blocks on disk */ static int run_delalloc_nocow(struct inode *inode, struct page *locked_page, - u64 start, u64 end, int *page_started) + u64 start, u64 end, int *page_started, int force) { struct btrfs_root *root = BTRFS_I(inode)->root; struct btrfs_trans_handle *trans; @@ -602,6 +603,7 @@ static int run_delalloc_nocow(struct inode *inode, struct page *locked_page, u64 num_bytes; int extent_type; int ret; + int type; int nocow; int check_prev = 1; @@ -654,7 +656,8 @@ next_slot: struct btrfs_file_extent_item); extent_type = btrfs_file_extent_type(leaf, fi); - if (extent_type == BTRFS_FILE_EXTENT_REG) { + if (extent_type == BTRFS_FILE_EXTENT_REG || + extent_type == BTRFS_FILE_EXTENT_PREALLOC) { struct btrfs_block_group_cache *block_group; disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); extent_end = found_key.offset + @@ -669,6 +672,8 @@ next_slot: goto out_check; if (disk_bytenr == 0) goto out_check; + if (extent_type == BTRFS_FILE_EXTENT_REG && !force) + goto out_check; if (btrfs_cross_ref_exist(trans, root, disk_bytenr)) goto out_check; block_group = btrfs_lookup_block_group(root->fs_info, @@ -709,10 +714,39 @@ out_check: disk_bytenr += cur_offset - found_key.offset; num_bytes = min(end + 1, extent_end) - cur_offset; + if (extent_type == BTRFS_FILE_EXTENT_PREALLOC) { + struct extent_map *em; + struct extent_map_tree *em_tree; + em_tree = &BTRFS_I(inode)->extent_tree; + em = alloc_extent_map(GFP_NOFS); + em->start = cur_offset; + em->len = num_bytes; + em->block_len = num_bytes; + em->block_start = disk_bytenr; + em->bdev = root->fs_info->fs_devices->latest_bdev; + set_bit(EXTENT_FLAG_PINNED, &em->flags); + while (1) { + spin_lock(&em_tree->lock); + ret = add_extent_mapping(em_tree, em); + spin_unlock(&em_tree->lock); + if (ret != -EEXIST) { + free_extent_map(em); + break; + } + btrfs_drop_extent_cache(inode, em->start, + em->start + em->len - 1, 0); + } + type = BTRFS_ORDERED_PREALLOC; + } else { + type = BTRFS_ORDERED_NOCOW; + } ret = btrfs_add_ordered_extent(inode, cur_offset, disk_bytenr, - num_bytes, num_bytes, - BTRFS_ORDERED_NOCOW); + num_bytes, num_bytes, type); + BUG_ON(ret); + extent_clear_unlock_delalloc(inode, &BTRFS_I(inode)->io_tree, + cur_offset, cur_offset + num_bytes - 1, + locked_page, 0, 0, 0); cur_offset = extent_end; if (cur_offset > end) break; @@ -745,7 +779,10 @@ static int run_delalloc_range(struct inode *inode, struct page *locked_page, if (btrfs_test_opt(root, NODATACOW) || btrfs_test_flag(inode, NODATACOW)) ret = run_delalloc_nocow(inode, locked_page, start, end, - page_started); + page_started, 0); + else if (btrfs_test_flag(inode, PREALLOC)) + ret = run_delalloc_nocow(inode, locked_page, start, end, + page_started, 1); else ret = cow_file_range(inode, locked_page, start, end, page_started); @@ -1006,6 +1043,63 @@ int btrfs_writepage_start_hook(struct page *page, u64 start, u64 end) return -EAGAIN; } +static int insert_reserved_file_extent(struct btrfs_trans_handle *trans, + struct inode *inode, u64 file_pos, + u64 disk_bytenr, u64 disk_num_bytes, + u64 num_bytes, u64 ram_bytes, + u8 compression, u8 encryption, + u16 other_encoding, int extent_type) +{ + struct btrfs_root *root = BTRFS_I(inode)->root; + struct btrfs_file_extent_item *fi; + struct btrfs_path *path; + struct extent_buffer *leaf; + struct btrfs_key ins; + u64 hint; + int ret; + + path = btrfs_alloc_path(); + BUG_ON(!path); + + ret = btrfs_drop_extents(trans, root, inode, file_pos, + file_pos + num_bytes, file_pos, &hint); + BUG_ON(ret); + + ins.objectid = inode->i_ino; + ins.offset = file_pos; + ins.type = BTRFS_EXTENT_DATA_KEY; + ret = btrfs_insert_empty_item(trans, root, path, &ins, sizeof(*fi)); + BUG_ON(ret); + leaf = path->nodes[0]; + fi = btrfs_item_ptr(leaf, path->slots[0], + struct btrfs_file_extent_item); + btrfs_set_file_extent_generation(leaf, fi, trans->transid); + btrfs_set_file_extent_type(leaf, fi, extent_type); + btrfs_set_file_extent_disk_bytenr(leaf, fi, disk_bytenr); + btrfs_set_file_extent_disk_num_bytes(leaf, fi, disk_num_bytes); + btrfs_set_file_extent_offset(leaf, fi, 0); + btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes); + btrfs_set_file_extent_ram_bytes(leaf, fi, ram_bytes); + btrfs_set_file_extent_compression(leaf, fi, compression); + btrfs_set_file_extent_encryption(leaf, fi, encryption); + btrfs_set_file_extent_other_encoding(leaf, fi, other_encoding); + btrfs_mark_buffer_dirty(leaf); + + inode_add_bytes(inode, num_bytes); + btrfs_drop_extent_cache(inode, file_pos, file_pos + num_bytes - 1, 0); + + ins.objectid = disk_bytenr; + ins.offset = disk_num_bytes; + ins.type = BTRFS_EXTENT_ITEM_KEY; + ret = btrfs_alloc_reserved_extent(trans, root, leaf->start, + root->root_key.objectid, + trans->transid, inode->i_ino, &ins); + BUG_ON(ret); + + btrfs_free_path(path); + return 0; +} + /* as ordered data IO finishes, this gets called so we can finish * an ordered extent if the range of bytes in the file it covers are * fully written. @@ -1016,12 +1110,7 @@ static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end) struct btrfs_trans_handle *trans; struct btrfs_ordered_extent *ordered_extent; struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; - struct btrfs_file_extent_item *extent_item; - struct btrfs_path *path = NULL; - struct extent_buffer *leaf; - u64 alloc_hint = 0; - struct list_head list; - struct btrfs_key ins; + int compressed = 0; int ret; ret = btrfs_dec_test_ordered_pending(inode, start, end - start + 1); @@ -1035,67 +1124,30 @@ static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end) if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags)) goto nocow; - path = btrfs_alloc_path(); - BUG_ON(!path); - lock_extent(io_tree, ordered_extent->file_offset, ordered_extent->file_offset + ordered_extent->len - 1, GFP_NOFS); - INIT_LIST_HEAD(&list); - - ret = btrfs_drop_extents(trans, root, inode, - ordered_extent->file_offset, - ordered_extent->file_offset + - ordered_extent->len, - ordered_extent->file_offset, &alloc_hint); - BUG_ON(ret); - - ins.objectid = inode->i_ino; - ins.offset = ordered_extent->file_offset; - ins.type = BTRFS_EXTENT_DATA_KEY; - ret = btrfs_insert_empty_item(trans, root, path, &ins, - sizeof(*extent_item)); - BUG_ON(ret); - leaf = path->nodes[0]; - extent_item = btrfs_item_ptr(leaf, path->slots[0], - struct btrfs_file_extent_item); - btrfs_set_file_extent_generation(leaf, extent_item, trans->transid); - btrfs_set_file_extent_type(leaf, extent_item, BTRFS_FILE_EXTENT_REG); - btrfs_set_file_extent_disk_bytenr(leaf, extent_item, - ordered_extent->start); - btrfs_set_file_extent_disk_num_bytes(leaf, extent_item, - ordered_extent->disk_len); - btrfs_set_file_extent_offset(leaf, extent_item, 0); - if (test_bit(BTRFS_ORDERED_COMPRESSED, &ordered_extent->flags)) - btrfs_set_file_extent_compression(leaf, extent_item, 1); - else - btrfs_set_file_extent_compression(leaf, extent_item, 0); - btrfs_set_file_extent_encryption(leaf, extent_item, 0); - btrfs_set_file_extent_other_encoding(leaf, extent_item, 0); - - /* ram bytes = extent_num_bytes for now */ - btrfs_set_file_extent_num_bytes(leaf, extent_item, - ordered_extent->len); - btrfs_set_file_extent_ram_bytes(leaf, extent_item, - ordered_extent->len); - btrfs_mark_buffer_dirty(leaf); - - btrfs_drop_extent_cache(inode, ordered_extent->file_offset, - ordered_extent->file_offset + - ordered_extent->len - 1, 0); - - ins.objectid = ordered_extent->start; - ins.offset = ordered_extent->disk_len; - ins.type = BTRFS_EXTENT_ITEM_KEY; - ret = btrfs_alloc_reserved_extent(trans, root, leaf->start, - root->root_key.objectid, - trans->transid, inode->i_ino, &ins); - BUG_ON(ret); - btrfs_release_path(root, path); - - inode_add_bytes(inode, ordered_extent->len); + compressed = 1; + if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) { + BUG_ON(compressed); + ret = btrfs_mark_extent_written(trans, root, inode, + ordered_extent->file_offset, + ordered_extent->file_offset + + ordered_extent->len); + BUG_ON(ret); + } else { + ret = insert_reserved_file_extent(trans, inode, + ordered_extent->file_offset, + ordered_extent->start, + ordered_extent->disk_len, + ordered_extent->len, + ordered_extent->len, + compressed, 0, 0, + BTRFS_FILE_EXTENT_REG); + BUG_ON(ret); + } unlock_extent(io_tree, ordered_extent->file_offset, ordered_extent->file_offset + ordered_extent->len - 1, GFP_NOFS); @@ -1115,8 +1167,6 @@ nocow: btrfs_put_ordered_extent(ordered_extent); btrfs_end_transaction(trans, root); - if (path) - btrfs_free_path(path); return 0; } @@ -3488,7 +3538,8 @@ again: found_type = btrfs_file_extent_type(leaf, item); extent_start = found_key.offset; compressed = btrfs_file_extent_compression(leaf, item); - if (found_type == BTRFS_FILE_EXTENT_REG) { + if (found_type == BTRFS_FILE_EXTENT_REG || + found_type == BTRFS_FILE_EXTENT_PREALLOC) { extent_end = extent_start + btrfs_file_extent_num_bytes(leaf, item); } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { @@ -3521,7 +3572,8 @@ again: goto not_found_em; } - if (found_type == BTRFS_FILE_EXTENT_REG) { + if (found_type == BTRFS_FILE_EXTENT_REG || + found_type == BTRFS_FILE_EXTENT_PREALLOC) { em->start = extent_start; em->len = extent_end - extent_start; bytenr = btrfs_file_extent_disk_bytenr(leaf, item); @@ -3538,6 +3590,8 @@ again: bytenr += btrfs_file_extent_offset(leaf, item); em->block_start = bytenr; em->block_len = em->len; + if (found_type == BTRFS_FILE_EXTENT_PREALLOC) + set_bit(EXTENT_FLAG_PREALLOC, &em->flags); } goto insert; } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { @@ -3969,6 +4023,7 @@ int btrfs_create_subvol_root(struct btrfs_root *new_root, struct dentry *dentry, if (error) return error; + atomic_inc(&inode->i_count); d_instantiate(dentry, inode); return 0; } @@ -4318,6 +4373,7 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry, inode->i_op = &btrfs_symlink_inode_operations; inode->i_mapping->a_ops = &btrfs_symlink_aops; inode->i_mapping->backing_dev_info = &root->fs_info->bdi; + inode_set_bytes(inode, name_len); btrfs_i_size_write(inode, name_len - 1); err = btrfs_update_inode(trans, root, inode); if (err) @@ -4335,6 +4391,130 @@ out_fail: return err; } +static int prealloc_file_range(struct inode *inode, u64 start, u64 end, + u64 alloc_hint, int mode) +{ + struct btrfs_trans_handle *trans; + struct btrfs_root *root = BTRFS_I(inode)->root; + struct btrfs_key ins; + u64 alloc_size; + u64 cur_offset = start; + u64 num_bytes = end - start; + int ret = 0; + + trans = btrfs_join_transaction(root, 1); + BUG_ON(!trans); + btrfs_set_trans_block_group(trans, inode); + + while (num_bytes > 0) { + alloc_size = min(num_bytes, root->fs_info->max_extent); + ret = btrfs_reserve_extent(trans, root, alloc_size, + root->sectorsize, 0, alloc_hint, + (u64)-1, &ins, 1); + if (ret) { + WARN_ON(1); + goto out; + } + ret = insert_reserved_file_extent(trans, inode, + cur_offset, ins.objectid, + ins.offset, ins.offset, + ins.offset, 0, 0, 0, + BTRFS_FILE_EXTENT_PREALLOC); + BUG_ON(ret); + num_bytes -= ins.offset; + cur_offset += ins.offset; + alloc_hint = ins.objectid + ins.offset; + } +out: + if (cur_offset > start) { + inode->i_ctime = CURRENT_TIME; + btrfs_set_flag(inode, PREALLOC); + if (!(mode & FALLOC_FL_KEEP_SIZE) && + cur_offset > i_size_read(inode)) + btrfs_i_size_write(inode, cur_offset); + ret = btrfs_update_inode(trans, root, inode); + BUG_ON(ret); + } + + btrfs_end_transaction(trans, root); + return ret; +} + +static long btrfs_fallocate(struct inode *inode, int mode, + loff_t offset, loff_t len) +{ + u64 cur_offset; + u64 last_byte; + u64 alloc_start; + u64 alloc_end; + u64 alloc_hint = 0; + u64 mask = BTRFS_I(inode)->root->sectorsize - 1; + struct extent_map *em; + int ret; + + alloc_start = offset & ~mask; + alloc_end = (offset + len + mask) & ~mask; + + mutex_lock(&inode->i_mutex); + if (alloc_start > inode->i_size) { + ret = btrfs_cont_expand(inode, alloc_start); + if (ret) + goto out; + } + + while (1) { + struct btrfs_ordered_extent *ordered; + lock_extent(&BTRFS_I(inode)->io_tree, alloc_start, + alloc_end - 1, GFP_NOFS); + ordered = btrfs_lookup_first_ordered_extent(inode, + alloc_end - 1); + if (ordered && + ordered->file_offset + ordered->len > alloc_start && + ordered->file_offset < alloc_end) { + btrfs_put_ordered_extent(ordered); + unlock_extent(&BTRFS_I(inode)->io_tree, + alloc_start, alloc_end - 1, GFP_NOFS); + btrfs_wait_ordered_range(inode, alloc_start, + alloc_end - alloc_start); + } else { + if (ordered) + btrfs_put_ordered_extent(ordered); + break; + } + } + + cur_offset = alloc_start; + while (1) { + em = btrfs_get_extent(inode, NULL, 0, cur_offset, + alloc_end - cur_offset, 0); + BUG_ON(IS_ERR(em) || !em); + last_byte = min(extent_map_end(em), alloc_end); + last_byte = (last_byte + mask) & ~mask; + if (em->block_start == EXTENT_MAP_HOLE) { + ret = prealloc_file_range(inode, cur_offset, + last_byte, alloc_hint, mode); + if (ret < 0) { + free_extent_map(em); + break; + } + } + if (em->block_start <= EXTENT_MAP_LAST_BYTE) + alloc_hint = em->block_start; + free_extent_map(em); + + cur_offset = last_byte; + if (cur_offset >= alloc_end) { + ret = 0; + break; + } + } + unlock_extent(&BTRFS_I(inode)->io_tree, alloc_start, alloc_end - 1, + GFP_NOFS); +out: + mutex_unlock(&inode->i_mutex); + return ret; +} + static int btrfs_set_page_dirty(struct page *page) { return __set_page_dirty_nobuffers(page); @@ -4421,6 +4601,7 @@ static struct inode_operations btrfs_file_inode_operations = { .listxattr = btrfs_listxattr, .removexattr = btrfs_removexattr, .permission = btrfs_permission, + .fallocate = btrfs_fallocate, }; static struct inode_operations btrfs_special_inode_operations = { .getattr = btrfs_getattr, |