nfsd: clean up raparams handling

Refactor the raparam hash helpers to just deal with the raparms,
and keep opening/closing files separate from that.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

3 files changed, 43 insertions, 55 deletions

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 5c7eab9c12ba..5286206169bc 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -33,6 +33,7 @@
  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include <linux/file.h>
 #include <linux/slab.h>
 #include <linux/namei.h>
 #include <linux/statfs.h>
@@ -3419,7 +3420,7 @@ nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
         struct file *file = read->rd_filp;
         struct svc_fh *fhp = read->rd_fhp;
         int starting_len = xdr->buf->len;
-        struct raparms *ra;
+        struct raparms *ra = NULL;
         __be32 *p;
         __be32 err;
 
@@ -3441,23 +3442,30 @@ nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
         maxcount = min_t(unsigned long, maxcount, (xdr->buf->buflen - xdr->buf->len));
         maxcount = min_t(unsigned long, maxcount, read->rd_length);
 
-        if (read->rd_filp)
+        if (read->rd_filp) {
                 err = nfsd_permission(resp->rqstp, fhp->fh_export,
                                 fhp->fh_dentry,
                                 NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE);
-        else
-                err = nfsd_get_tmp_read_open(resp->rqstp, read->rd_fhp,
-                                                &file, &ra);
-        if (err)
-                goto err_truncate;
+                if (err)
+                        goto err_truncate;
+        } else {
+                err = nfsd_open(resp->rqstp, fhp, S_IFREG, NFSD_MAY_READ,
+                                &file);
+                if (err)
+                        goto err_truncate;
+
+                ra = nfsd_init_raparms(file);
+        }
 
         if (file->f_op->splice_read && test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
                 err = nfsd4_encode_splice_read(resp, read, file, maxcount);
         else
                 err = nfsd4_encode_readv(resp, read, file, maxcount);
 
+        if (ra)
+                nfsd_put_raparams(file, ra);
         if (!read->rd_filp)
-                nfsd_put_tmp_read_open(file, ra);
+                fput(file);
 
 err_truncate:
         if (err)
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index b540ca789906..52f2dd3898c4 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -725,14 +725,12 @@ out:
         return err;
 }
 
-/*
- * Obtain the readahead parameters for the file
- * specified by (dev, ino).
- */
-
-static inline struct raparms *
-nfsd_get_raparms(dev_t dev, ino_t ino)
+struct raparms *
+nfsd_init_raparms(struct file *file)
 {
+        struct inode *inode = file_inode(file);
+        dev_t dev = inode->i_sb->s_dev;
+        ino_t ino = inode->i_ino;
         struct raparms  *ra, **rap, **frap = NULL;
         int depth = 0;
         unsigned int hash;
@@ -769,9 +767,23 @@ found:
         ra->p_count++;
         nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++;
         spin_unlock(&rab->pb_lock);
+
+        if (ra->p_set)
+                file->f_ra = ra->p_ra;
         return ra;
 }
 
+void nfsd_put_raparams(struct file *file, struct raparms *ra)
+{
+        struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex];
+
+        spin_lock(&rab->pb_lock);
+        ra->p_ra = file->f_ra;
+        ra->p_set = 1;
+        ra->p_count--;
+        spin_unlock(&rab->pb_lock);
+}
+
 /*
  * Grab and keep cached pages associated with a file in the svc_rqst
  * so that they can be passed to the network sendmsg/sendpage routines
@@ -964,40 +976,6 @@ out_nfserr:
         return err;
 }
 
-__be32 nfsd_get_tmp_read_open(struct svc_rqst *rqstp, struct svc_fh *fhp,
-                struct file **file, struct raparms **ra)
-{
-        struct inode *inode;
-        __be32 err;
-
-        err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, file);
-        if (err)
-                return err;
-
-        inode = file_inode(*file);
-
-        /* Get readahead parameters */
-        *ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino);
-
-        if (*ra && (*ra)->p_set)
-                (*file)->f_ra = (*ra)->p_ra;
-        return nfs_ok;
-}
-
-void nfsd_put_tmp_read_open(struct file *file, struct raparms *ra)
-{
-        /* Write back readahead params */
-        if (ra) {
-                struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex];
-                spin_lock(&rab->pb_lock);
-                ra->p_ra = file->f_ra;
-                ra->p_set = 1;
-                ra->p_count--;
-                spin_unlock(&rab->pb_lock);
-        }
-        fput(file);
-}
-
 /*
  * Read data from a file. count must contain the requested read count
  * on entry. On return, *count contains the number of bytes actually read.
@@ -1010,13 +988,15 @@ __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
         struct raparms  *ra;
         __be32 err;
 
-        err = nfsd_get_tmp_read_open(rqstp, fhp, &file, &ra);
+        err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
         if (err)
                 return err;
 
+        ra = nfsd_init_raparms(file);
         err = nfsd_vfs_read(rqstp, file, offset, vec, vlen, count);
-
-        nfsd_put_tmp_read_open(file, ra);
+        if (ra)
+                nfsd_put_raparams(file, ra);
+        fput(file);
 
         return err;
 }
diff --git a/fs/nfsd/vfs.h b/fs/nfsd/vfs.h
index 17a5e0db6a77..053c4addbd9d 100644
--- a/fs/nfsd/vfs.h
+++ b/fs/nfsd/vfs.h
@@ -72,9 +72,6 @@ __be32		nfsd_commit(struct svc_rqst *, struct svc_fh *,
 __be32          nfsd_open(struct svc_rqst *, struct svc_fh *, umode_t,
                                 int, struct file **);
 struct raparms;
-__be32          nfsd_get_tmp_read_open(struct svc_rqst *, struct svc_fh *,
-                                struct file **, struct raparms **);
-void            nfsd_put_tmp_read_open(struct file *, struct raparms *);
 __be32          nfsd_splice_read(struct svc_rqst *,
                                 struct file *, loff_t, unsigned long *);
 __be32          nfsd_readv(struct file *, loff_t, struct kvec *, int,
@@ -103,6 +100,9 @@ __be32		nfsd_statfs(struct svc_rqst *, struct svc_fh *,
 __be32          nfsd_permission(struct svc_rqst *, struct svc_export *,
                                 struct dentry *, int);
 
+struct raparms *nfsd_init_raparms(struct file *file);
+void            nfsd_put_raparams(struct file *file, struct raparms *ra);
+
 static inline int fh_want_write(struct svc_fh *fh)
 {
         int ret = mnt_want_write(fh->fh_export->ex_path.mnt);