Commit f44840ad authored by Chengguang Xu's avatar Chengguang Xu Committed by Jan Kara
Browse files

quota: add dqi_dirty_list description to comment of Dquot List Management 



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

Signed-off-by: default avatarChengguang Xu <cgxu519@gmail.com>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
parent a188339c

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.