diff options
Diffstat (limited to 'fs/nfsd/nfssvc.c')
| -rw-r--r-- | fs/nfsd/nfssvc.c | 88 |
1 files changed, 60 insertions, 28 deletions
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c index 7c09852be713..cbba4a935786 100644 --- a/fs/nfsd/nfssvc.c +++ b/fs/nfsd/nfssvc.c @@ -22,6 +22,7 @@ #include <linux/freezer.h> #include <linux/fs_struct.h> #include <linux/kthread.h> +#include <linux/swap.h> #include <linux/sunrpc/types.h> #include <linux/sunrpc/stats.h> @@ -40,9 +41,6 @@ extern struct svc_program nfsd_program; static int nfsd(void *vrqstp); struct timeval nfssvc_boot; -static atomic_t nfsd_busy; -static unsigned long nfsd_last_call; -static DEFINE_SPINLOCK(nfsd_call_lock); /* * nfsd_mutex protects nfsd_serv -- both the pointer itself and the members @@ -123,6 +121,8 @@ struct svc_program nfsd_program = { }; +u32 nfsd_supported_minorversion; + int nfsd_vers(int vers, enum vers_op change) { if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) @@ -149,6 +149,28 @@ int nfsd_vers(int vers, enum vers_op change) } return 0; } + +int nfsd_minorversion(u32 minorversion, enum vers_op change) +{ + if (minorversion > NFSD_SUPPORTED_MINOR_VERSION) + return -1; + switch(change) { + case NFSD_SET: + nfsd_supported_minorversion = minorversion; + break; + case NFSD_CLEAR: + if (minorversion == 0) + return -1; + nfsd_supported_minorversion = minorversion - 1; + break; + case NFSD_TEST: + return minorversion <= nfsd_supported_minorversion; + case NFSD_AVAIL: + return minorversion <= NFSD_SUPPORTED_MINOR_VERSION; + } + return 0; +} + /* * Maximum number of nfsd processes */ @@ -200,6 +222,28 @@ void nfsd_reset_versions(void) } } +/* + * Each session guarantees a negotiated per slot memory cache for replies + * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated + * NFSv4.1 server might want to use more memory for a DRC than a machine + * with mutiple services. + * + * Impose a hard limit on the number of pages for the DRC which varies + * according to the machines free pages. This is of course only a default. + * + * For now this is a #defined shift which could be under admin control + * in the future. + */ +static void set_max_drc(void) +{ + /* The percent of nr_free_buffer_pages used by the V4.1 server DRC */ + #define NFSD_DRC_SIZE_SHIFT 7 + nfsd_serv->sv_drc_max_pages = nr_free_buffer_pages() + >> NFSD_DRC_SIZE_SHIFT; + nfsd_serv->sv_drc_pages_used = 0; + dprintk("%s svc_drc_max_pages %u\n", __func__, + nfsd_serv->sv_drc_max_pages); +} int nfsd_create_serv(void) { @@ -227,11 +271,12 @@ int nfsd_create_serv(void) nfsd_max_blksize /= 2; } - atomic_set(&nfsd_busy, 0); nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, nfsd_last_thread, nfsd, THIS_MODULE); if (nfsd_serv == NULL) err = -ENOMEM; + else + set_max_drc(); do_gettimeofday(&nfssvc_boot); /* record boot time */ return err; @@ -375,26 +420,6 @@ nfsd_svc(unsigned short port, int nrservs) return error; } -static inline void -update_thread_usage(int busy_threads) -{ - unsigned long prev_call; - unsigned long diff; - int decile; - - spin_lock(&nfsd_call_lock); - prev_call = nfsd_last_call; - nfsd_last_call = jiffies; - decile = busy_threads*10/nfsdstats.th_cnt; - if (decile>0 && decile <= 10) { - diff = nfsd_last_call - prev_call; - if ( (nfsdstats.th_usage[decile-1] += diff) >= NFSD_USAGE_WRAP) - nfsdstats.th_usage[decile-1] -= NFSD_USAGE_WRAP; - if (decile == 10) - nfsdstats.th_fullcnt++; - } - spin_unlock(&nfsd_call_lock); -} /* * This is the NFS server kernel thread @@ -460,8 +485,6 @@ nfsd(void *vrqstp) continue; } - update_thread_usage(atomic_read(&nfsd_busy)); - atomic_inc(&nfsd_busy); /* Lock the export hash tables for reading. */ exp_readlock(); @@ -470,8 +493,6 @@ nfsd(void *vrqstp) /* Unlock export hash tables */ exp_readunlock(); - update_thread_usage(atomic_read(&nfsd_busy)); - atomic_dec(&nfsd_busy); } /* Clear signals before calling svc_exit_thread() */ @@ -539,6 +560,10 @@ nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) + rqstp->rq_res.head[0].iov_len; rqstp->rq_res.head[0].iov_len += sizeof(__be32); + /* NFSv4.1 DRC requires statp */ + if (rqstp->rq_vers == 4) + nfsd4_set_statp(rqstp, statp); + /* Now call the procedure handler, and encode NFS status. */ nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); nfserr = map_new_errors(rqstp->rq_vers, nfserr); @@ -570,3 +595,10 @@ nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) nfsd_cache_update(rqstp, proc->pc_cachetype, statp + 1); return 1; } + +int nfsd_pool_stats_open(struct inode *inode, struct file *file) +{ + if (nfsd_serv == NULL) + return -ENODEV; + return svc_pool_stats_open(nfsd_serv, file); +} |