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Btrfs: save balance parameters to disk
Introduce a new btree objectid for storing balance item. The reason is to be able to resume restriper after a crash with the same parameters. Balance item has a very high objectid and goes into tree of tree roots. The key for the new item is as follows: [ BTRFS_BALANCE_OBJECTID ; BTRFS_BALANCE_ITEM_KEY ; 0 ] Older kernels simply ignore it so it's safe to mount with an older kernel and then go back to the newer one. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov
parent
cfa4c961cc
commit
0940ebf6b9
133
fs/btrfs/ctree.h
133
fs/btrfs/ctree.h
@ -86,6 +86,9 @@ struct btrfs_ordered_sum;
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/* holds checksums of all the data extents */
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#define BTRFS_CSUM_TREE_OBJECTID 7ULL
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/* for storing balance parameters in the root tree */
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#define BTRFS_BALANCE_OBJECTID -4ULL
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/* orhpan objectid for tracking unlinked/truncated files */
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#define BTRFS_ORPHAN_OBJECTID -5ULL
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@ -692,6 +695,54 @@ struct btrfs_root_ref {
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__le16 name_len;
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} __attribute__ ((__packed__));
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struct btrfs_disk_balance_args {
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/*
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* profiles to operate on, single is denoted by
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* BTRFS_AVAIL_ALLOC_BIT_SINGLE
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*/
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__le64 profiles;
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/* usage filter */
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__le64 usage;
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/* devid filter */
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__le64 devid;
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/* devid subset filter [pstart..pend) */
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__le64 pstart;
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__le64 pend;
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/* btrfs virtual address space subset filter [vstart..vend) */
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__le64 vstart;
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__le64 vend;
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/*
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* profile to convert to, single is denoted by
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* BTRFS_AVAIL_ALLOC_BIT_SINGLE
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*/
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__le64 target;
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/* BTRFS_BALANCE_ARGS_* */
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__le64 flags;
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__le64 unused[8];
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} __attribute__ ((__packed__));
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/*
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* store balance parameters to disk so that balance can be properly
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* resumed after crash or unmount
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*/
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struct btrfs_balance_item {
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/* BTRFS_BALANCE_* */
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__le64 flags;
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struct btrfs_disk_balance_args data;
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struct btrfs_disk_balance_args meta;
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struct btrfs_disk_balance_args sys;
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__le64 unused[4];
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} __attribute__ ((__packed__));
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#define BTRFS_FILE_EXTENT_INLINE 0
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#define BTRFS_FILE_EXTENT_REG 1
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#define BTRFS_FILE_EXTENT_PREALLOC 2
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@ -1409,6 +1460,8 @@ struct btrfs_ioctl_defrag_range_args {
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#define BTRFS_DEV_ITEM_KEY 216
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#define BTRFS_CHUNK_ITEM_KEY 228
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#define BTRFS_BALANCE_ITEM_KEY 248
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/*
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* string items are for debugging. They just store a short string of
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* data in the FS
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@ -2103,8 +2156,86 @@ BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
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BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
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num_devices, 64);
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/* struct btrfs_super_block */
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/* struct btrfs_balance_item */
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BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
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static inline void btrfs_balance_data(struct extent_buffer *eb,
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struct btrfs_balance_item *bi,
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struct btrfs_disk_balance_args *ba)
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{
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read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
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}
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static inline void btrfs_set_balance_data(struct extent_buffer *eb,
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struct btrfs_balance_item *bi,
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struct btrfs_disk_balance_args *ba)
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{
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write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
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}
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static inline void btrfs_balance_meta(struct extent_buffer *eb,
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struct btrfs_balance_item *bi,
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struct btrfs_disk_balance_args *ba)
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{
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read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
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}
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static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
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struct btrfs_balance_item *bi,
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struct btrfs_disk_balance_args *ba)
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{
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write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
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}
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static inline void btrfs_balance_sys(struct extent_buffer *eb,
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struct btrfs_balance_item *bi,
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struct btrfs_disk_balance_args *ba)
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{
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read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
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}
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static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
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struct btrfs_balance_item *bi,
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struct btrfs_disk_balance_args *ba)
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{
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write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
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}
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static inline void
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btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
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struct btrfs_disk_balance_args *disk)
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{
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memset(cpu, 0, sizeof(*cpu));
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cpu->profiles = le64_to_cpu(disk->profiles);
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cpu->usage = le64_to_cpu(disk->usage);
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cpu->devid = le64_to_cpu(disk->devid);
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cpu->pstart = le64_to_cpu(disk->pstart);
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cpu->pend = le64_to_cpu(disk->pend);
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cpu->vstart = le64_to_cpu(disk->vstart);
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cpu->vend = le64_to_cpu(disk->vend);
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cpu->target = le64_to_cpu(disk->target);
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cpu->flags = le64_to_cpu(disk->flags);
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}
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static inline void
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btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
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struct btrfs_balance_args *cpu)
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{
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memset(disk, 0, sizeof(*disk));
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disk->profiles = cpu_to_le64(cpu->profiles);
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disk->usage = cpu_to_le64(cpu->usage);
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disk->devid = cpu_to_le64(cpu->devid);
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disk->pstart = cpu_to_le64(cpu->pstart);
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disk->pend = cpu_to_le64(cpu->pend);
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disk->vstart = cpu_to_le64(cpu->vstart);
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disk->vend = cpu_to_le64(cpu->vend);
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disk->target = cpu_to_le64(cpu->target);
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disk->flags = cpu_to_le64(cpu->flags);
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}
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/* struct btrfs_super_block */
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BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
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BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
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BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
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@ -2073,6 +2073,97 @@ error:
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return ret;
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}
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static int insert_balance_item(struct btrfs_root *root,
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struct btrfs_balance_control *bctl)
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{
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struct btrfs_trans_handle *trans;
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struct btrfs_balance_item *item;
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struct btrfs_disk_balance_args disk_bargs;
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struct btrfs_path *path;
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struct extent_buffer *leaf;
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struct btrfs_key key;
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int ret, err;
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path = btrfs_alloc_path();
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if (!path)
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return -ENOMEM;
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trans = btrfs_start_transaction(root, 0);
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if (IS_ERR(trans)) {
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btrfs_free_path(path);
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return PTR_ERR(trans);
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}
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key.objectid = BTRFS_BALANCE_OBJECTID;
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key.type = BTRFS_BALANCE_ITEM_KEY;
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key.offset = 0;
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ret = btrfs_insert_empty_item(trans, root, path, &key,
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sizeof(*item));
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if (ret)
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goto out;
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leaf = path->nodes[0];
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item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_balance_item);
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memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item));
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btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->data);
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btrfs_set_balance_data(leaf, item, &disk_bargs);
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btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->meta);
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btrfs_set_balance_meta(leaf, item, &disk_bargs);
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btrfs_cpu_balance_args_to_disk(&disk_bargs, &bctl->sys);
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btrfs_set_balance_sys(leaf, item, &disk_bargs);
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btrfs_set_balance_flags(leaf, item, bctl->flags);
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btrfs_mark_buffer_dirty(leaf);
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out:
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btrfs_free_path(path);
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err = btrfs_commit_transaction(trans, root);
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if (err && !ret)
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ret = err;
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return ret;
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}
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static int del_balance_item(struct btrfs_root *root)
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{
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struct btrfs_trans_handle *trans;
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struct btrfs_path *path;
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struct btrfs_key key;
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int ret, err;
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path = btrfs_alloc_path();
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if (!path)
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return -ENOMEM;
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trans = btrfs_start_transaction(root, 0);
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if (IS_ERR(trans)) {
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btrfs_free_path(path);
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return PTR_ERR(trans);
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}
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key.objectid = BTRFS_BALANCE_OBJECTID;
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key.type = BTRFS_BALANCE_ITEM_KEY;
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key.offset = 0;
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ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
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if (ret < 0)
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goto out;
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if (ret > 0) {
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ret = -ENOENT;
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goto out;
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}
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ret = btrfs_del_item(trans, root, path);
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out:
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btrfs_free_path(path);
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err = btrfs_commit_transaction(trans, root);
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if (err && !ret)
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ret = err;
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return ret;
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}
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/*
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* Should be called with both balance and volume mutexes held to
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* serialize other volume operations (add_dev/rm_dev/resize) with
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@ -2423,7 +2514,11 @@ error:
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static void __cancel_balance(struct btrfs_fs_info *fs_info)
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{
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int ret;
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unset_balance_control(fs_info);
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ret = del_balance_item(fs_info->tree_root);
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BUG_ON(ret);
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}
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void update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
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@ -2530,6 +2625,10 @@ int btrfs_balance(struct btrfs_balance_control *bctl,
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}
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do_balance:
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ret = insert_balance_item(fs_info->tree_root, bctl);
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if (ret)
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goto out;
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set_balance_control(bctl);
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mutex_unlock(&fs_info->balance_mutex);
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