At 08/08/2016 10:54 AM, Goldwyn Rodrigues wrote:
On 08/07/2016 07:39 PM, Qu Wenruo wrote:At 08/07/2016 01:19 AM, Goldwyn Rodrigues wrote:Thanks Qu, This patch set fixes all the reported problems. However, I have some minor issues with coding style.Thanks for the test.On 08/04/2016 09:29 PM, Qu Wenruo wrote:Refactor btrfs_qgroup_insert_dirty_extent() function, to two functions: 1. _btrfs_qgroup_insert_dirty_extent() Almost the same with original code. For delayed_ref usage, which has delayed refs locked. Change the return value type to int, since caller never needs the pointer, but only needs to know if they need to free the allocated memory. 2. btrfs_qgroup_record_dirty_extent() The more encapsulated version. Will do the delayed_refs lock, memory allocation, quota enabled check and other misc things. The original design is to keep exported functions to minimal, but since more btrfs hacks exposed, like replacing path in balance, needs us to record dirty extents manually, so we have to add such functions. Also, add comment for both functions, to info developers how to keep qgroup correct when doing hacks. Cc: Mark Fasheh <mfas...@suse.de> Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com> --- fs/btrfs/delayed-ref.c | 5 +---- fs/btrfs/extent-tree.c | 36 +++++------------------------------- fs/btrfs/qgroup.c | 39 ++++++++++++++++++++++++++++++++++----- fs/btrfs/qgroup.h | 44 +++++++++++++++++++++++++++++++++++++++++--- 4 files changed, 81 insertions(+), 43 deletions(-) diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c index 430b368..5eed597 100644 --- a/fs/btrfs/delayed-ref.c +++ b/fs/btrfs/delayed-ref.c @@ -541,7 +541,6 @@ add_delayed_ref_head(struct btrfs_fs_info *fs_info, struct btrfs_delayed_ref_head *existing; struct btrfs_delayed_ref_head *head_ref = NULL; struct btrfs_delayed_ref_root *delayed_refs; - struct btrfs_qgroup_extent_record *qexisting; int count_mod = 1; int must_insert_reserved = 0; @@ -606,9 +605,7 @@ add_delayed_ref_head(struct btrfs_fs_info *fs_info, qrecord->num_bytes = num_bytes; qrecord->old_roots = NULL; - qexisting = btrfs_qgroup_insert_dirty_extent(delayed_refs, - qrecord); - if (qexisting) + if(_btrfs_qgroup_insert_dirty_extent(delayed_refs, qrecord)) kfree(qrecord); } diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 9fcb8c9..47c85ff 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -8519,34 +8519,6 @@ reada: wc->reada_slot = slot; } -/* - * These may not be seen by the usual inc/dec ref code so we have to - * add them here. - */ -static int record_one_subtree_extent(struct btrfs_trans_handle *trans, - struct btrfs_root *root, u64 bytenr, - u64 num_bytes) -{ - struct btrfs_qgroup_extent_record *qrecord; - struct btrfs_delayed_ref_root *delayed_refs; - - qrecord = kmalloc(sizeof(*qrecord), GFP_NOFS); - if (!qrecord) - return -ENOMEM; - - qrecord->bytenr = bytenr; - qrecord->num_bytes = num_bytes; - qrecord->old_roots = NULL; - - delayed_refs = &trans->transaction->delayed_refs; - spin_lock(&delayed_refs->lock); - if (btrfs_qgroup_insert_dirty_extent(delayed_refs, qrecord)) - kfree(qrecord); - spin_unlock(&delayed_refs->lock); - - return 0; -} - static int account_leaf_items(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct extent_buffer *eb) @@ -8580,7 +8552,8 @@ static int account_leaf_items(struct btrfs_trans_handle *trans, num_bytes = btrfs_file_extent_disk_num_bytes(eb, fi); - ret = record_one_subtree_extent(trans, root, bytenr, num_bytes); + ret = btrfs_qgroup_record_dirty_extent(trans, root->fs_info, + bytenr, num_bytes, GFP_NOFS); if (ret) return ret; } @@ -8729,8 +8702,9 @@ walk_down: btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK); path->locks[level] = BTRFS_READ_LOCK_BLOCKING; - ret = record_one_subtree_extent(trans, root, child_bytenr, - root->nodesize); + ret = btrfs_qgroup_record_dirty_extent(trans, + root->fs_info, child_bytenr, + root->nodesize, GFP_NOFS); if (ret) goto out; } diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c index 9d4c05b..76d4f67 100644 --- a/fs/btrfs/qgroup.c +++ b/fs/btrfs/qgroup.c @@ -1453,9 +1453,9 @@ int btrfs_qgroup_prepare_account_extents(struct btrfs_trans_handle *trans, return ret; } -struct btrfs_qgroup_extent_record -*btrfs_qgroup_insert_dirty_extent(struct btrfs_delayed_ref_root *delayed_refs, - struct btrfs_qgroup_extent_record *record) +int _btrfs_qgroup_insert_dirty_extent( + struct btrfs_delayed_ref_root *delayed_refs, + struct btrfs_qgroup_extent_record *record)Why do you rename the function preceding with an underscore? just leave it as it is.Because these two functions have different usage.Where is the "other" function used? AFAICS, you are replacing the function name.
See 2nd and 3rd patch.Or be more specific, dirty hack fixes, which is the case where we need to do manual tracking for qgroup.
the underscore one are used when caller has already acquired needed lock, which is used by delayed-refs code. And the one without underscore is for other usage.What/Where is the "other usage"? Please don't say "previous".
See above.
Despite the lock, these two functions are all the same. So I prefer to use underscore.BTW, you missed include/trace/events/btrfs.h, the reference to btrfs_qgroup_insert_dirty_extent in DEFINE_EVENT.
Since btrfs_qgroup_insert_dirty_extent() is just calling the underscore one with proper lock content, so the trace is not affected.
Thanks, Qu
{ struct rb_node **p = &delayed_refs->dirty_extent_root.rb_node; struct rb_node *parent_node = NULL; @@ -1474,12 +1474,41 @@ struct btrfs_qgroup_extent_record else if (bytenr > entry->bytenr) p = &(*p)->rb_right; else - return entry; + return 1;return -EALREADY?Since the existing case is quite common, I prefer to use >=0 return value, other than minus return value which is more common for error case. Thanks, Qu} rb_link_node(&record->node, parent_node, p); rb_insert_color(&record->node, &delayed_refs->dirty_extent_root); - return NULL; + return 0; +} + +int btrfs_qgroup_record_dirty_extent(struct btrfs_trans_handle *trans, + struct btrfs_fs_info *fs_info, u64 bytenr, u64 num_bytes, + gfp_t gfp_flag) +{ + struct btrfs_qgroup_extent_record *record; + struct btrfs_delayed_ref_root *delayed_refs; + int ret; + + if (!fs_info->quota_enabled || bytenr == 0 || num_bytes == 0) + return 0; + if (WARN_ON(trans == NULL)) + return -EINVAL; + record = kmalloc(sizeof(*record), gfp_flag); + if (!record) + return -ENOMEM; + + delayed_refs = &trans->transaction->delayed_refs; + record->bytenr = bytenr; + record->num_bytes = num_bytes; + record->old_roots = NULL; + + spin_lock(&delayed_refs->lock); + ret = _btrfs_qgroup_insert_dirty_extent(delayed_refs, record); + spin_unlock(&delayed_refs->lock); + if (ret > 0) + kfree(record); + return 0; } #define UPDATE_NEW 0 diff --git a/fs/btrfs/qgroup.h b/fs/btrfs/qgroup.h index ecb2c14..f6691e3 100644 --- a/fs/btrfs/qgroup.h +++ b/fs/btrfs/qgroup.h @@ -63,9 +63,47 @@ void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info); struct btrfs_delayed_extent_op; int btrfs_qgroup_prepare_account_extents(struct btrfs_trans_handle *trans, struct btrfs_fs_info *fs_info); -struct btrfs_qgroup_extent_record -*btrfs_qgroup_insert_dirty_extent(struct btrfs_delayed_ref_root *delayed_refs, - struct btrfs_qgroup_extent_record *record); + +/* + * Insert one dirty extent record into delayed_refs for qgroup. + * Caller must ensure the delayed_refs are already locked and quota is enabled. + * + * Return 0 if there is no existing dirty extent record for that bytenr, and + * insert that record into delayed_refs. + * Return > 0 if there is already existing dirty extent record for that bytenr. + * Caller then can free the record structure. + * Error is not possibleYou can remove this if you intend to return EALREADY.+ * + * For caller needs better encapsulated interface, call + * btrfs_qgroup_record_dirty_extent(), which will handle locks and memory + * allocation. + */ +int _btrfs_qgroup_insert_dirty_extent( + struct btrfs_delayed_ref_root *delayed_refs, + struct btrfs_qgroup_extent_record *record); + +/* + * Info qgroup to track one extent, so at trans commit time qgroup can + * update qgroup accounts for that extent. + * + * That extent can be either meta or data. + * This function can be called several times for any extent and won't cause + * any qgroup incorrectness. + * As long as dirty extent is recorded, qgroup can hardly go wrong. + * + * This function should be called when owner of extent is changed and the + * code uses hack to avoid normal inc/dev_extent_ref(). + * For example, swapping two tree blocks in balance or modifying file extent + * disk bytenr manually. + * + * Return 0 if the operation is done. + * Return <0 for error, like memory allocation failure or invalid parameter + * (NULL trans) + */ +int btrfs_qgroup_record_dirty_extent(struct btrfs_trans_handle *trans, + struct btrfs_fs_info *fs_info, u64 bytenr, u64 num_bytes, + gfp_t gfp_flag); + int btrfs_qgroup_account_extent(struct btrfs_trans_handle *trans, struct btrfs_fs_info *fs_info,
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