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quota: add dqi_dirty_list description to comment of Dquot List Management

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[ Upstream commit f44840ad1f ]

Actually there are four lists for dquot management, so add
the description of dqui_dirty_list to comment.

Signed-off-by: Chengguang Xu <cgxu519@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Stable-dep-of: dabc8b2075 ("quota: fix dqput() to follow the guarantees dquot_srcu should provide")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Chengguang Xu 2019-05-06 09:39:03 +08:00 committed by Greg Kroah-Hartman
parent f640a27e78
commit 3d99866624
1 changed files with 8 additions and 3 deletions
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11
fs/quota/dquot.c
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@ -223,9 +223,9 @@ static void put_quota_format(struct quota_format_type *fmt)
/*
* Dquot List Management:
* The quota code uses three lists for dquot management: the inuse_list,
* free_dquots, and dquot_hash[] array. A single dquot structure may be
* on all three lists, depending on its current state.
* The quota code uses four lists for dquot management: the inuse_list,
* free_dquots, dqi_dirty_list, and dquot_hash[] array. A single dquot
* structure may be on some of those lists, depending on its current state.
*
* All dquots are placed to the end of inuse_list when first created, and this
* list is used for invalidate operation, which must look at every dquot.
@ -236,6 +236,11 @@ static void put_quota_format(struct quota_format_type *fmt)
* dqstats.free_dquots gives the number of dquots on the list. When
* dquot is invalidated it's completely released from memory.
*
* Dirty dquots are added to the dqi_dirty_list of quota_info when mark
* dirtied, and this list is searched when writing dirty dquots back to
* quota file. Note that some filesystems do dirty dquot tracking on their
* own (e.g. in a journal) and thus don't use dqi_dirty_list.
*
* Dquots with a specific identity (device, type and id) are placed on
* one of the dquot_hash[] hash chains. The provides an efficient search
* mechanism to locate a specific dquot.