nfsd: pass svc_export_cache pointer as private data to "exports" seq file ops

Global svc_export_cache cache is going to be replaced with per-net instance. So
prepare the ground for it.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index c20a405..1495320 100644 (file)
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -1029,13 +1029,14 @@ exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
 /* Iterator */
 
 static void *e_start(struct seq_file *m, loff_t *pos)
-       __acquires(svc_export_cache.hash_lock)
+       __acquires(((struct cache_detail *)m->private)->hash_lock)
 {
        loff_t n = *pos;
        unsigned hash, export;
        struct cache_head *ch;
-       
-       read_lock(&svc_export_cache.hash_lock);
+       struct cache_detail *cd = m->private;
+
+       read_lock(&cd->hash_lock);
        if (!n--)
                return SEQ_START_TOKEN;
        hash = n >> 32;
@@ -1082,9 +1083,11 @@ static void *e_next(struct seq_file *m, void *p, loff_t *pos)
 }
 
 static void e_stop(struct seq_file *m, void *p)
-       __releases(svc_export_cache.hash_lock)
+       __releases(((struct cache_detail *)m->private)->hash_lock)
 {
-       read_unlock(&svc_export_cache.hash_lock);
+       struct cache_detail *cd = m->private;
+
+       read_unlock(&cd->hash_lock);
 }
 
 static struct flags {
@@ -1195,6 +1198,7 @@ static int e_show(struct seq_file *m, void *p)
 {
        struct cache_head *cp = p;
        struct svc_export *exp = container_of(cp, struct svc_export, h);
+       struct cache_detail *cd = m->private;
 
        if (p == SEQ_START_TOKEN) {
                seq_puts(m, "# Version 1.1\n");
@@ -1203,10 +1207,10 @@ static int e_show(struct seq_file *m, void *p)
        }
 
        cache_get(&exp->h);
-       if (cache_check(&svc_export_cache, &exp->h, NULL))
+       if (cache_check(cd, &exp->h, NULL))
                return 0;
        exp_put(exp);
-       return svc_export_show(m, &svc_export_cache, cp);
+       return svc_export_show(m, cd, cp);
 }
 
 const struct seq_operations nfs_exports_op = {

diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 2c53be6..ae19293 100644 (file)
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -127,7 +127,16 @@ static const struct file_operations transaction_ops = {
 
 static int exports_open(struct inode *inode, struct file *file)
 {
-       return seq_open(file, &nfs_exports_op);
+       int err;
+       struct seq_file *seq;
+
+       err = seq_open(file, &nfs_exports_op);
+       if (err)
+               return err;
+
+       seq = file->private_data;
+       seq->private = &svc_export_cache;
+       return 0;
 }
 
 static const struct file_operations exports_operations = {