From: Dongsheng Yang Date: Fri, 12 Dec 2014 08:44:35 +0000 (+0800) Subject: Btrfs: qgroup: Introduce a may_use to account space_info->bytes_may_use. X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=31193213f1f9c13f6485007ef1e233b119e46910;p=linux-beck.git Btrfs: qgroup: Introduce a may_use to account space_info->bytes_may_use. Currently, for pre_alloc or delay_alloc, the bytes will be accounted in space_info by the three guys. space_info->bytes_may_use --- space_info->reserved --- space_info->used. But on the other hand, in qgroup, there are only two counters to account the bytes, qgroup->reserved and qgroup->excl. And qg->reserved accounts bytes in space_info->bytes_may_use and qg->excl accounts bytes in space_info->used. So the bytes in space_info->reserved is not accounted in qgroup. If so, there is a window we can exceed the quota limit when bytes is in space_info->reserved. Example: # btrfs quota enable /mnt # btrfs qgroup limit -e 10M /mnt # for((i=0;i<20;i++));do fallocate -l 1M /mnt/data$i; done # sync # btrfs qgroup show -pcre /mnt qgroupid rfer excl max_rfer max_excl parent child -------- ---- ---- -------- -------- ------ ----- 0/5 20987904 20987904 0 10485760 --- --- qg->excl is 20987904 larger than max_excl 10485760. This patch introduce a new counter named may_use to qgroup, then there are three counters in qgroup to account bytes in space_info as below. space_info->bytes_may_use --- space_info->reserved --- space_info->used. qgroup->may_use --- qgroup->reserved --- qgroup->excl With this patch applied: # btrfs quota enable /mnt # btrfs qgroup limit -e 10M /mnt # for((i=0;i<20;i++));do fallocate -l 1M /mnt/data$i; done fallocate: /mnt/data9: fallocate failed: Disk quota exceeded fallocate: /mnt/data10: fallocate failed: Disk quota exceeded fallocate: /mnt/data11: fallocate failed: Disk quota exceeded fallocate: /mnt/data12: fallocate failed: Disk quota exceeded fallocate: /mnt/data13: fallocate failed: Disk quota exceeded fallocate: /mnt/data14: fallocate failed: Disk quota exceeded fallocate: /mnt/data15: fallocate failed: Disk quota exceeded fallocate: /mnt/data16: fallocate failed: Disk quota exceeded fallocate: /mnt/data17: fallocate failed: Disk quota exceeded fallocate: /mnt/data18: fallocate failed: Disk quota exceeded fallocate: /mnt/data19: fallocate failed: Disk quota exceeded # sync # btrfs qgroup show -pcre /mnt qgroupid rfer excl max_rfer max_excl parent child -------- ---- ---- -------- -------- ------ ----- 0/5 9453568 9453568 0 10485760 --- --- Reported-by: Cyril SCETBON Signed-off-by: Dongsheng Yang Signed-off-by: Chris Mason --- diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 695d5110e020..3113e0b79b99 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -5725,8 +5725,12 @@ static int pin_down_extent(struct btrfs_root *root, set_extent_dirty(root->fs_info->pinned_extents, bytenr, bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL); - if (reserved) + if (reserved) { + btrfs_qgroup_update_reserved_bytes(root->fs_info, + root->root_key.objectid, + num_bytes, -1); trace_btrfs_reserved_extent_free(root, bytenr, num_bytes); + } return 0; } @@ -6464,6 +6468,9 @@ void btrfs_free_tree_block(struct btrfs_trans_handle *trans, btrfs_put_block_group(cache); trace_btrfs_reserved_extent_free(root, buf->start, buf->len); pin = 0; + btrfs_qgroup_update_reserved_bytes(root->fs_info, + root->root_key.objectid, + buf->len, -1); } out: if (pin) @@ -7196,7 +7203,11 @@ static int __btrfs_free_reserved_extent(struct btrfs_root *root, ret = btrfs_discard_extent(root, start, len, NULL); btrfs_add_free_space(cache, start, len); btrfs_update_reserved_bytes(cache, len, RESERVE_FREE, delalloc); + btrfs_qgroup_update_reserved_bytes(root->fs_info, + root->root_key.objectid, + len, -1); } + btrfs_put_block_group(cache); trace_btrfs_reserved_extent_free(root, start, len); @@ -7433,6 +7444,9 @@ int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, BUG_ON(ret); /* logic error */ ret = alloc_reserved_file_extent(trans, root, 0, root_objectid, 0, owner, offset, ins, 1); + btrfs_qgroup_update_reserved_bytes(root->fs_info, + root->root_key.objectid, + ins->offset, 1); btrfs_put_block_group(block_group); return ret; } @@ -7579,6 +7593,10 @@ struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans, return ERR_PTR(ret); } + btrfs_qgroup_update_reserved_bytes(root->fs_info, + root_objectid, + ins.offset, 1); + buf = btrfs_init_new_buffer(trans, root, ins.objectid, level); BUG_ON(IS_ERR(buf)); /* -ENOMEM */ diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 6ef97c184c7b..a9f69a0d4b08 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -60,6 +60,7 @@ #include "backref.h" #include "hash.h" #include "props.h" +#include "qgroup.h" struct btrfs_iget_args { struct btrfs_key *location; @@ -753,7 +754,9 @@ retry: } goto out_free; } - + btrfs_qgroup_update_reserved_bytes(root->fs_info, + root->root_key.objectid, + ins.offset, 1); /* * here we're doing allocation and writeback of the * compressed pages @@ -978,6 +981,10 @@ static noinline int cow_file_range(struct inode *inode, if (ret < 0) goto out_unlock; + btrfs_qgroup_update_reserved_bytes(root->fs_info, + root->root_key.objectid, + ins.offset, 1); + em = alloc_extent_map(); if (!em) { ret = -ENOMEM; @@ -7030,6 +7037,10 @@ static struct extent_map *btrfs_new_extent_direct(struct inode *inode, return ERR_PTR(ret); } + btrfs_qgroup_update_reserved_bytes(root->fs_info, + root->root_key.objectid, + ins.offset, 1); + return em; } @@ -9583,6 +9594,11 @@ static int __btrfs_prealloc_file_range(struct inode *inode, int mode, btrfs_end_transaction(trans, root); break; } + + btrfs_qgroup_update_reserved_bytes(root->fs_info, + root->root_key.objectid, + ins.offset, 1); + btrfs_drop_extent_cache(inode, cur_offset, cur_offset + ins.offset -1, 0); diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c index de321c90130c..cd291733dc3e 100644 --- a/fs/btrfs/qgroup.c +++ b/fs/btrfs/qgroup.c @@ -72,6 +72,7 @@ struct btrfs_qgroup { /* * reservation tracking */ + u64 may_use; u64 reserved; /* @@ -1417,6 +1418,8 @@ static int qgroup_excl_accounting(struct btrfs_fs_info *fs_info, WARN_ON(sign < 0 && qgroup->excl < oper->num_bytes); qgroup->excl += sign * oper->num_bytes; qgroup->excl_cmpr += sign * oper->num_bytes; + if (sign > 0) + qgroup->reserved -= oper->num_bytes; qgroup_dirty(fs_info, qgroup); @@ -1436,6 +1439,8 @@ static int qgroup_excl_accounting(struct btrfs_fs_info *fs_info, qgroup->rfer_cmpr += sign * oper->num_bytes; WARN_ON(sign < 0 && qgroup->excl < oper->num_bytes); qgroup->excl += sign * oper->num_bytes; + if (sign > 0) + qgroup->reserved -= oper->num_bytes; qgroup->excl_cmpr += sign * oper->num_bytes; qgroup_dirty(fs_info, qgroup); @@ -2378,6 +2383,61 @@ out: return ret; } +int btrfs_qgroup_update_reserved_bytes(struct btrfs_fs_info *fs_info, + u64 ref_root, + u64 num_bytes, + int sign) +{ + struct btrfs_root *quota_root; + struct btrfs_qgroup *qgroup; + int ret = 0; + struct ulist_node *unode; + struct ulist_iterator uiter; + + if (!is_fstree(ref_root) || !fs_info->quota_enabled) + return 0; + + if (num_bytes == 0) + return 0; + + spin_lock(&fs_info->qgroup_lock); + quota_root = fs_info->quota_root; + if (!quota_root) + goto out; + + qgroup = find_qgroup_rb(fs_info, ref_root); + if (!qgroup) + goto out; + + ulist_reinit(fs_info->qgroup_ulist); + ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid, + (uintptr_t)qgroup, GFP_ATOMIC); + if (ret < 0) + goto out; + + ULIST_ITER_INIT(&uiter); + while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) { + struct btrfs_qgroup *qg; + struct btrfs_qgroup_list *glist; + + qg = u64_to_ptr(unode->aux); + + qg->reserved += sign * num_bytes; + + list_for_each_entry(glist, &qg->groups, next_group) { + ret = ulist_add(fs_info->qgroup_ulist, + glist->group->qgroupid, + (uintptr_t)glist->group, GFP_ATOMIC); + if (ret < 0) + goto out; + } + } + +out: + spin_unlock(&fs_info->qgroup_lock); + return ret; +} + /* * reserve some space for a qgroup and all its parents. The reservation takes * place with start_transaction or dealloc_reserve, similar to ENOSPC @@ -2426,14 +2486,14 @@ int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes) qg = u64_to_ptr(unode->aux); if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_RFER) && - qg->reserved + (s64)qg->rfer + num_bytes > + qg->reserved + qg->may_use + (s64)qg->rfer + num_bytes > qg->max_rfer) { ret = -EDQUOT; goto out; } if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) && - qg->reserved + (s64)qg->excl + num_bytes > + qg->reserved + qg->may_use + (s64)qg->excl + num_bytes > qg->max_excl) { ret = -EDQUOT; goto out; @@ -2457,7 +2517,7 @@ int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes) qg = u64_to_ptr(unode->aux); - qg->reserved += num_bytes; + qg->may_use += num_bytes; } out: @@ -2503,7 +2563,7 @@ void btrfs_qgroup_free(struct btrfs_root *root, u64 num_bytes) qg = u64_to_ptr(unode->aux); - qg->reserved -= num_bytes; + qg->may_use -= num_bytes; list_for_each_entry(glist, &qg->groups, next_group) { ret = ulist_add(fs_info->qgroup_ulist, diff --git a/fs/btrfs/qgroup.h b/fs/btrfs/qgroup.h index c5242aa9a4b2..64d49b8482b3 100644 --- a/fs/btrfs/qgroup.h +++ b/fs/btrfs/qgroup.h @@ -94,6 +94,10 @@ int btrfs_run_qgroups(struct btrfs_trans_handle *trans, int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans, struct btrfs_fs_info *fs_info, u64 srcid, u64 objectid, struct btrfs_qgroup_inherit *inherit); +int btrfs_qgroup_update_reserved_bytes(struct btrfs_fs_info *fs_info, + u64 ref_root, + u64 num_bytes, + int sign); int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes); void btrfs_qgroup_free(struct btrfs_root *root, u64 num_bytes);