quota: add dqi_dirty_list description to comment of Dquot List Management (f44840ad) · Commits · 戴 / test

fs/quota/dquot.c

+8 −3

Original line number	Diff line number	Diff line
		@@ -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.