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nfsd41: use globals for DRC limits

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The version 4.1 DRC memory limit and tracking variables are server wide and
session specific. Replace struct svc_serv fields with globals.
Stop using the svc_serv sv_lock.

Add a spinlock to serialize access to the DRC limit management variables which
change on session creation and deletion (usage counter) or (future)
administrative action to adjust the total DRC memory limit.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
This commit is contained in:
Andy Adamson
2009-06-24 15:37:45 -04:00
committed by J. Bruce Fields
parent 7702ce40bc
commit 4bd9b0f4af
4 changed files with 23 additions and 11 deletions
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include/linux/nfsd/nfsd.h
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@@ -56,6 +56,9 @@ extern struct svc_version nfsd_version2, nfsd_version3,
extern u32 nfsd_supported_minorversion;
extern struct mutex nfsd_mutex;
extern struct svc_serv *nfsd_serv;
extern spinlock_t nfsd_drc_lock;
extern unsigned int nfsd_drc_max_pages;
extern unsigned int nfsd_drc_pages_used;
extern struct seq_operations nfs_exports_op;