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quota: Keep which entries were set by SETQUOTA quotactl

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Quota in a clustered environment needs to synchronize quota information
among cluster nodes. This means we have to occasionally update some
information in dquot from disk / network. On the other hand we have to
be careful not to overwrite changes administrator did via SETQUOTA.
So indicate in dquot->dq_flags which entries have been set by SETQUOTA
and quota format can clear these flags when it properly propagated
the changes.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
This commit is contained in:
Jan Kara
2008-10-02 16:48:10 +02:00
committed by Mark Fasheh
parent db49d2df48
commit 4d59bce4f9
2 changed files with 30 additions and 8 deletions
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26
include/linux/quota.h
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@@ -80,12 +80,21 @@
* Quota structure used for communication with userspace via quotactl
* Following flags are used to specify which fields are valid
*/
#define QIF_BLIMITS 1
#define QIF_SPACE 2
#define QIF_ILIMITS 4
#define QIF_INODES 8
#define QIF_BTIME 16
#define QIF_ITIME 32
enum {
QIF_BLIMITS_B = 0,
QIF_SPACE_B,
QIF_ILIMITS_B,
QIF_INODES_B,
QIF_BTIME_B,
QIF_ITIME_B,
};
#define QIF_BLIMITS (1 << QIF_BLIMITS_B)
#define QIF_SPACE (1 << QIF_SPACE_B)
#define QIF_ILIMITS (1 << QIF_ILIMITS_B)
#define QIF_INODES (1 << QIF_INODES_B)
#define QIF_BTIME (1 << QIF_BTIME_B)
#define QIF_ITIME (1 << QIF_ITIME_B)
#define QIF_LIMITS (QIF_BLIMITS | QIF_ILIMITS)
#define QIF_USAGE (QIF_SPACE | QIF_INODES)
#define QIF_TIMES (QIF_BTIME | QIF_ITIME)
@@ -242,6 +251,11 @@ extern struct dqstats dqstats;
#define DQ_FAKE_B 3 /* no limits only usage */
#define DQ_READ_B 4 /* dquot was read into memory */
#define DQ_ACTIVE_B 5 /* dquot is active (dquot_release not called) */
#define DQ_LASTSET_B 6 /* Following 6 bits (see QIF_) are reserved\
* for the mask of entries set via SETQUOTA\
* quotactl. They are set under dq_data_lock\
* and the quota format handling dquot can\
* clear them when it sees fit. */
struct dquot {
struct hlist_node dq_hash; /* Hash list in memory */