1 files changed, 12 insertions, 50 deletions

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index b1940660502f..28a238dab23a 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -139,10 +139,8 @@ nfs_opendir(struct inode *inode, struct file *filp)
 
         nfs_inc_stats(inode, NFSIOS_VFSOPEN);
 
-        lock_kernel();
         /* Call generic open code in order to cache credentials */
         res = nfs_open(inode, filp);
-        unlock_kernel();
         return res;
 }
 
@@ -536,8 +534,6 @@ static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
                         (long long)filp->f_pos);
         nfs_inc_stats(inode, NFSIOS_VFSGETDENTS);
 
-        lock_kernel();
-
         /*
          * filp->f_pos points to the dirent entry number.
          * *desc->dir_cookie has the cookie for the next entry. We have
@@ -595,7 +591,6 @@ static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
         }
 out:
         nfs_unblock_sillyrename(dentry);
-        unlock_kernel();
         if (res > 0)
                 res = 0;
         dfprintk(FILE, "NFS: readdir(%s/%s) returns %ld\n",
@@ -779,7 +774,6 @@ static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd)
         struct nfs_fattr fattr;
 
         parent = dget_parent(dentry);
-        lock_kernel();
         dir = parent->d_inode;
         nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE);
         inode = dentry->d_inode;
@@ -817,7 +811,6 @@ static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd)
 
         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
  out_valid:
-        unlock_kernel();
         dput(parent);
         dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n",
                         __func__, dentry->d_parent->d_name.name,
@@ -836,7 +829,6 @@ out_zap_parent:
                 shrink_dcache_parent(dentry);
         }
         d_drop(dentry);
-        unlock_kernel();
         dput(parent);
         dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n",
                         __func__, dentry->d_parent->d_name.name,
@@ -870,6 +862,14 @@ static int nfs_dentry_delete(struct dentry *dentry)
 
 }
 
+static void nfs_drop_nlink(struct inode *inode)
+{
+        spin_lock(&inode->i_lock);
+        if (inode->i_nlink > 0)
+                drop_nlink(inode);
+        spin_unlock(&inode->i_lock);
+}
+
 /*
  * Called when the dentry loses inode.
  * We use it to clean up silly-renamed files.
@@ -881,10 +881,8 @@ static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode)
                 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
 
         if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
-                lock_kernel();
                 drop_nlink(inode);
                 nfs_complete_unlink(dentry, inode);
-                unlock_kernel();
         }
         iput(inode);
 }
@@ -915,8 +913,6 @@ static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, stru
         res = ERR_PTR(-ENOMEM);
         dentry->d_op = NFS_PROTO(dir)->dentry_ops;
 
-        lock_kernel();
-
         /*
          * If we're doing an exclusive create, optimize away the lookup
          * but don't hash the dentry.
@@ -924,7 +920,7 @@ static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, stru
         if (nfs_is_exclusive_create(dir, nd)) {
                 d_instantiate(dentry, NULL);
                 res = NULL;
-                goto out_unlock;
+                goto out;
         }
 
         parent = dentry->d_parent;
@@ -952,8 +948,6 @@ no_entry:
         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
 out_unblock_sillyrename:
         nfs_unblock_sillyrename(parent);
-out_unlock:
-        unlock_kernel();
 out:
         return res;
 }
@@ -1011,9 +1005,7 @@ static struct dentry *nfs_atomic_lookup(struct inode *dir, struct dentry *dentry
         }
 
         /* Open the file on the server */
-        lock_kernel();
         res = nfs4_atomic_open(dir, dentry, nd);
-        unlock_kernel();
         if (IS_ERR(res)) {
                 error = PTR_ERR(res);
                 switch (error) {
@@ -1075,9 +1067,7 @@ static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd)
          * operations that change the directory. We therefore save the
          * change attribute *before* we do the RPC call.
          */
-        lock_kernel();
         ret = nfs4_open_revalidate(dir, dentry, openflags, nd);
-        unlock_kernel();
 out:
         dput(parent);
         if (!ret)
@@ -1230,14 +1220,11 @@ static int nfs_create(struct inode *dir, struct dentry *dentry, int mode,
         if ((nd->flags & LOOKUP_CREATE) != 0)
                 open_flags = nd->intent.open.flags;
 
-        lock_kernel();
         error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, nd);
         if (error != 0)
                 goto out_err;
-        unlock_kernel();
         return 0;
 out_err:
-        unlock_kernel();
         d_drop(dentry);
         return error;
 }
@@ -1260,14 +1247,11 @@ nfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
         attr.ia_mode = mode;
         attr.ia_valid = ATTR_MODE;
 
-        lock_kernel();
         status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev);
         if (status != 0)
                 goto out_err;
-        unlock_kernel();
         return 0;
 out_err:
-        unlock_kernel();
         d_drop(dentry);
         return status;
 }
@@ -1286,15 +1270,12 @@ static int nfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
         attr.ia_valid = ATTR_MODE;
         attr.ia_mode = mode | S_IFDIR;
 
-        lock_kernel();
         error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr);
         if (error != 0)
                 goto out_err;
-        unlock_kernel();
         return 0;
 out_err:
         d_drop(dentry);
-        unlock_kernel();
         return error;
 }
 
@@ -1311,14 +1292,12 @@ static int nfs_rmdir(struct inode *dir, struct dentry *dentry)
         dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n",
                         dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
 
-        lock_kernel();
         error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name);
         /* Ensure the VFS deletes this inode */
         if (error == 0 && dentry->d_inode != NULL)
                 clear_nlink(dentry->d_inode);
         else if (error == -ENOENT)
                 nfs_dentry_handle_enoent(dentry);
-        unlock_kernel();
 
         return error;
 }
@@ -1420,7 +1399,7 @@ static int nfs_safe_remove(struct dentry *dentry)
                 error = NFS_PROTO(dir)->remove(dir, &dentry->d_name);
                 /* The VFS may want to delete this inode */
                 if (error == 0)
-                        drop_nlink(inode);
+                        nfs_drop_nlink(inode);
                 nfs_mark_for_revalidate(inode);
         } else
                 error = NFS_PROTO(dir)->remove(dir, &dentry->d_name);
@@ -1443,7 +1422,6 @@ static int nfs_unlink(struct inode *dir, struct dentry *dentry)
         dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id,
                 dir->i_ino, dentry->d_name.name);
 
-        lock_kernel();
         spin_lock(&dcache_lock);
         spin_lock(&dentry->d_lock);
         if (atomic_read(&dentry->d_count) > 1) {
@@ -1452,7 +1430,6 @@ static int nfs_unlink(struct inode *dir, struct dentry *dentry)
                 /* Start asynchronous writeout of the inode */
                 write_inode_now(dentry->d_inode, 0);
                 error = nfs_sillyrename(dir, dentry);
-                unlock_kernel();
                 return error;
         }
         if (!d_unhashed(dentry)) {
@@ -1466,7 +1443,6 @@ static int nfs_unlink(struct inode *dir, struct dentry *dentry)
                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
         } else if (need_rehash)
                 d_rehash(dentry);
-        unlock_kernel();
         return error;
 }
 
@@ -1503,13 +1479,9 @@ static int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *sym
         attr.ia_mode = S_IFLNK | S_IRWXUGO;
         attr.ia_valid = ATTR_MODE;
 
-        lock_kernel();
-
         page = alloc_page(GFP_HIGHUSER);
-        if (!page) {
-                unlock_kernel();
+        if (!page)
                 return -ENOMEM;
-        }
 
         kaddr = kmap_atomic(page, KM_USER0);
         memcpy(kaddr, symname, pathlen);
@@ -1524,7 +1496,6 @@ static int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *sym
                         dentry->d_name.name, symname, error);
                 d_drop(dentry);
                 __free_page(page);
-                unlock_kernel();
                 return error;
         }
 
@@ -1542,7 +1513,6 @@ static int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *sym
         } else
                 __free_page(page);
 
-        unlock_kernel();
         return 0;
 }
 
@@ -1556,14 +1526,12 @@ nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
                 old_dentry->d_parent->d_name.name, old_dentry->d_name.name,
                 dentry->d_parent->d_name.name, dentry->d_name.name);
 
-        lock_kernel();
         d_drop(dentry);
         error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name);
         if (error == 0) {
                 atomic_inc(&inode->i_count);
                 d_add(dentry, inode);
         }
-        unlock_kernel();
         return error;
 }
 
@@ -1603,7 +1571,6 @@ static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
          * To prevent any new references to the target during the rename,
          * we unhash the dentry and free the inode in advance.
          */
-        lock_kernel();
         if (!d_unhashed(new_dentry)) {
                 d_drop(new_dentry);
                 rehash = new_dentry;
@@ -1647,7 +1614,7 @@ static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
                         /* dentry still busy? */
                         goto out;
         } else
-                drop_nlink(new_inode);
+                nfs_drop_nlink(new_inode);
 
 go_ahead:
         /*
@@ -1681,7 +1648,6 @@ out:
         /* new dentry created? */
         if (dentry)
                 dput(dentry);
-        unlock_kernel();
         return error;
 }
 
@@ -1974,8 +1940,6 @@ int nfs_permission(struct inode *inode, int mask, struct nameidata *nd)
         }
 
 force_lookup:
-        lock_kernel();
-
         if (!NFS_PROTO(inode)->access)
                 goto out_notsup;
 
@@ -1985,7 +1949,6 @@ force_lookup:
                 put_rpccred(cred);
         } else
                 res = PTR_ERR(cred);
-        unlock_kernel();
 out:
         dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n",
                 inode->i_sb->s_id, inode->i_ino, mask, res);
@@ -1994,7 +1957,6 @@ out_notsup:
         res = nfs_revalidate_inode(NFS_SERVER(inode), inode);
         if (res == 0)
                 res = generic_permission(inode, mask, NULL);
-        unlock_kernel();
         goto out;
 }