7 files changed, 75 insertions, 62 deletions

diff --git a/fs/hpfs/Kconfig b/fs/hpfs/Kconfig
index 63b6f5632318..0c39dc3ef7d7 100644
--- a/fs/hpfs/Kconfig
+++ b/fs/hpfs/Kconfig
@@ -1,7 +1,7 @@
 config HPFS_FS
         tristate "OS/2 HPFS file system support"
         depends on BLOCK
-        depends on BKL # nontrivial to fix
+        depends on BROKEN || !PREEMPT
         help
           OS/2 is IBM's operating system for PC's, the same as Warp, and HPFS
           is the file system used for organizing files on OS/2 hard disk
diff --git a/fs/hpfs/dir.c b/fs/hpfs/dir.c
index d32f63a569f7..b3d7c0ddb609 100644
--- a/fs/hpfs/dir.c
+++ b/fs/hpfs/dir.c
@@ -6,16 +6,15 @@
  *  directory VFS functions
  */
 
-#include <linux/smp_lock.h>
 #include <linux/slab.h>
 #include "hpfs_fn.h"
 
 static int hpfs_dir_release(struct inode *inode, struct file *filp)
 {
-        lock_kernel();
+        hpfs_lock(inode->i_sb);
         hpfs_del_pos(inode, &filp->f_pos);
         /*hpfs_write_if_changed(inode);*/
-        unlock_kernel();
+        hpfs_unlock(inode->i_sb);
         return 0;
 }
 
@@ -30,7 +29,7 @@ static loff_t hpfs_dir_lseek(struct file *filp, loff_t off, int whence)
         struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
         struct super_block *s = i->i_sb;
 
-        lock_kernel();
+        hpfs_lock(s);
 
         /*printk("dir lseek\n");*/
         if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok;
@@ -43,12 +42,12 @@ static loff_t hpfs_dir_lseek(struct file *filp, loff_t off, int whence)
         }
         mutex_unlock(&i->i_mutex);
 ok:
-        unlock_kernel();
+        hpfs_unlock(s);
         return filp->f_pos = new_off;
 fail:
         mutex_unlock(&i->i_mutex);
         /*printk("illegal lseek: %016llx\n", new_off);*/
-        unlock_kernel();
+        hpfs_unlock(s);
         return -ESPIPE;
 }
 
@@ -64,7 +63,7 @@ static int hpfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
         int c1, c2 = 0;
         int ret = 0;
 
-        lock_kernel();
+        hpfs_lock(inode->i_sb);
 
         if (hpfs_sb(inode->i_sb)->sb_chk) {
                 if (hpfs_chk_sectors(inode->i_sb, inode->i_ino, 1, "dir_fnode")) {
@@ -167,7 +166,7 @@ static int hpfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
                 hpfs_brelse4(&qbh);
         }
 out:
-        unlock_kernel();
+        hpfs_unlock(inode->i_sb);
         return ret;
 }
 
@@ -197,10 +196,10 @@ struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, struct name
         struct inode *result = NULL;
         struct hpfs_inode_info *hpfs_result;
 
-        lock_kernel();
+        hpfs_lock(dir->i_sb);
         if ((err = hpfs_chk_name(name, &len))) {
                 if (err == -ENAMETOOLONG) {
-                        unlock_kernel();
+                        hpfs_unlock(dir->i_sb);
                         return ERR_PTR(-ENAMETOOLONG);
                 }
                 goto end_add;
@@ -298,7 +297,7 @@ struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, struct name
 
         end:
         end_add:
-        unlock_kernel();
+        hpfs_unlock(dir->i_sb);
         d_add(dentry, result);
         return NULL;
 
@@ -311,7 +310,7 @@ struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, struct name
         
         /*bail:*/
 
-        unlock_kernel();
+        hpfs_unlock(dir->i_sb);
         return ERR_PTR(-ENOENT);
 }
 
diff --git a/fs/hpfs/file.c b/fs/hpfs/file.c
index 9e84257b3ad5..9b9eb6933e43 100644
--- a/fs/hpfs/file.c
+++ b/fs/hpfs/file.c
@@ -6,16 +6,15 @@
  *  file VFS functions
  */
 
-#include <linux/smp_lock.h>
 #include "hpfs_fn.h"
 
 #define BLOCKS(size) (((size) + 511) >> 9)
 
 static int hpfs_file_release(struct inode *inode, struct file *file)
 {
-        lock_kernel();
+        hpfs_lock(inode->i_sb);
         hpfs_write_if_changed(inode);
-        unlock_kernel();
+        hpfs_unlock(inode->i_sb);
         return 0;
 }
 
@@ -49,14 +48,14 @@ static secno hpfs_bmap(struct inode *inode, unsigned file_secno)
 static void hpfs_truncate(struct inode *i)
 {
         if (IS_IMMUTABLE(i)) return /*-EPERM*/;
-        lock_kernel();
+        hpfs_lock(i->i_sb);
         hpfs_i(i)->i_n_secs = 0;
         i->i_blocks = 1 + ((i->i_size + 511) >> 9);
         hpfs_i(i)->mmu_private = i->i_size;
         hpfs_truncate_btree(i->i_sb, i->i_ino, 1, ((i->i_size + 511) >> 9));
         hpfs_write_inode(i);
         hpfs_i(i)->i_n_secs = 0;
-        unlock_kernel();
+        hpfs_unlock(i->i_sb);
 }
 
 static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create)
diff --git a/fs/hpfs/hpfs_fn.h b/fs/hpfs/hpfs_fn.h
index 1c43dbea55e8..c15adbca07ff 100644
--- a/fs/hpfs/hpfs_fn.h
+++ b/fs/hpfs/hpfs_fn.h
@@ -342,3 +342,25 @@ static inline time32_t gmt_to_local(struct super_block *s, time_t t)
         extern struct timezone sys_tz;
         return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
 }
+
+/*
+ * Locking:
+ *
+ * hpfs_lock() is a leftover from the big kernel lock.
+ * Right now, these functions are empty and only left
+ * for documentation purposes. The file system no longer
+ * works on SMP systems, so the lock is not needed
+ * any more.
+ *
+ * If someone is interested in making it work again, this
+ * would be the place to start by adding a per-superblock
+ * mutex and fixing all the bugs and performance issues
+ * caused by that.
+ */
+static inline void hpfs_lock(struct super_block *s)
+{
+}
+
+static inline void hpfs_unlock(struct super_block *s)
+{
+}
diff --git a/fs/hpfs/inode.c b/fs/hpfs/inode.c
index 1ae35baa539e..87f1f787e767 100644
--- a/fs/hpfs/inode.c
+++ b/fs/hpfs/inode.c
@@ -6,7 +6,6 @@
  *  inode VFS functions
  */
 
-#include <linux/smp_lock.h>
 #include <linux/slab.h>
 #include "hpfs_fn.h"
 
@@ -267,7 +266,7 @@ int hpfs_setattr(struct dentry *dentry, struct iattr *attr)
         struct inode *inode = dentry->d_inode;
         int error = -EINVAL;
 
-        lock_kernel();
+        hpfs_lock(inode->i_sb);
         if (inode->i_ino == hpfs_sb(inode->i_sb)->sb_root)
                 goto out_unlock;
         if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size > inode->i_size)
@@ -290,7 +289,7 @@ int hpfs_setattr(struct dentry *dentry, struct iattr *attr)
         hpfs_write_inode(inode);
 
  out_unlock:
-        unlock_kernel();
+        hpfs_unlock(inode->i_sb);
         return error;
 }
 
@@ -307,8 +306,8 @@ void hpfs_evict_inode(struct inode *inode)
         truncate_inode_pages(&inode->i_data, 0);
         end_writeback(inode);
         if (!inode->i_nlink) {
-                lock_kernel();
+                hpfs_lock(inode->i_sb);
                 hpfs_remove_fnode(inode->i_sb, inode->i_ino);
-                unlock_kernel();
+                hpfs_unlock(inode->i_sb);
         }
 }
diff --git a/fs/hpfs/namei.c b/fs/hpfs/namei.c
index f4ad9e31ddc4..d5f8c8a19023 100644
--- a/fs/hpfs/namei.c
+++ b/fs/hpfs/namei.c
@@ -6,7 +6,6 @@
  *  adding & removing files & directories
  */
 #include <linux/sched.h>
-#include <linux/smp_lock.h>
 #include "hpfs_fn.h"
 
 static int hpfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
@@ -25,7 +24,7 @@ static int hpfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
         struct hpfs_dirent dee;
         int err;
         if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err;
-        lock_kernel();
+        hpfs_lock(dir->i_sb);
         err = -ENOSPC;
         fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
         if (!fnode)
@@ -103,7 +102,7 @@ static int hpfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
         }
         d_instantiate(dentry, result);
         mutex_unlock(&hpfs_i(dir)->i_mutex);
-        unlock_kernel();
+        hpfs_unlock(dir->i_sb);
         return 0;
 bail3:
         mutex_unlock(&hpfs_i(dir)->i_mutex);
@@ -115,7 +114,7 @@ bail1:
         brelse(bh);
         hpfs_free_sectors(dir->i_sb, fno, 1);
 bail:
-        unlock_kernel();
+        hpfs_unlock(dir->i_sb);
         return err;
 }
 
@@ -132,7 +131,7 @@ static int hpfs_create(struct inode *dir, struct dentry *dentry, int mode, struc
         int err;
         if ((err = hpfs_chk_name(name, &len)))
                 return err==-ENOENT ? -EINVAL : err;
-        lock_kernel();
+        hpfs_lock(dir->i_sb);
         err = -ENOSPC;
         fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
         if (!fnode)
@@ -195,7 +194,7 @@ static int hpfs_create(struct inode *dir, struct dentry *dentry, int mode, struc
         }
         d_instantiate(dentry, result);
         mutex_unlock(&hpfs_i(dir)->i_mutex);
-        unlock_kernel();
+        hpfs_unlock(dir->i_sb);
         return 0;
 
 bail2:
@@ -205,7 +204,7 @@ bail1:
         brelse(bh);
         hpfs_free_sectors(dir->i_sb, fno, 1);
 bail:
-        unlock_kernel();
+        hpfs_unlock(dir->i_sb);
         return err;
 }
 
@@ -224,7 +223,7 @@ static int hpfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t
         if (hpfs_sb(dir->i_sb)->sb_eas < 2) return -EPERM;
         if (!new_valid_dev(rdev))
                 return -EINVAL;
-        lock_kernel();
+        hpfs_lock(dir->i_sb);
         err = -ENOSPC;
         fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
         if (!fnode)
@@ -274,7 +273,7 @@ static int hpfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t
         d_instantiate(dentry, result);
         mutex_unlock(&hpfs_i(dir)->i_mutex);
         brelse(bh);
-        unlock_kernel();
+        hpfs_unlock(dir->i_sb);
         return 0;
 bail2:
         mutex_unlock(&hpfs_i(dir)->i_mutex);
@@ -283,7 +282,7 @@ bail1:
         brelse(bh);
         hpfs_free_sectors(dir->i_sb, fno, 1);
 bail:
-        unlock_kernel();
+        hpfs_unlock(dir->i_sb);
         return err;
 }
 
@@ -299,9 +298,9 @@ static int hpfs_symlink(struct inode *dir, struct dentry *dentry, const char *sy
         struct inode *result;
         int err;
         if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err;
-        lock_kernel();
+        hpfs_lock(dir->i_sb);
         if (hpfs_sb(dir->i_sb)->sb_eas < 2) {
-                unlock_kernel();
+                hpfs_unlock(dir->i_sb);
                 return -EPERM;
         }
         err = -ENOSPC;
@@ -354,7 +353,7 @@ static int hpfs_symlink(struct inode *dir, struct dentry *dentry, const char *sy
         hpfs_write_inode_nolock(result);
         d_instantiate(dentry, result);
         mutex_unlock(&hpfs_i(dir)->i_mutex);
-        unlock_kernel();
+        hpfs_unlock(dir->i_sb);
         return 0;
 bail2:
         mutex_unlock(&hpfs_i(dir)->i_mutex);
@@ -363,7 +362,7 @@ bail1:
         brelse(bh);
         hpfs_free_sectors(dir->i_sb, fno, 1);
 bail:
-        unlock_kernel();
+        hpfs_unlock(dir->i_sb);
         return err;
 }
 
@@ -380,7 +379,7 @@ static int hpfs_unlink(struct inode *dir, struct dentry *dentry)
         int rep = 0;
         int err;
 
-        lock_kernel();
+        hpfs_lock(dir->i_sb);
         hpfs_adjust_length(name, &len);
 again:
         mutex_lock(&hpfs_i(inode)->i_parent_mutex);
@@ -416,7 +415,7 @@ again:
                 dentry_unhash(dentry);
                 if (!d_unhashed(dentry)) {
                         dput(dentry);
-                        unlock_kernel();
+                        hpfs_unlock(dir->i_sb);
                         return -ENOSPC;
                 }
                 if (generic_permission(inode, MAY_WRITE, 0, NULL) ||
@@ -435,7 +434,7 @@ again:
                         if (!err)
                                 goto again;
                 }
-                unlock_kernel();
+                hpfs_unlock(dir->i_sb);
                 return -ENOSPC;
         default:
                 drop_nlink(inode);
@@ -448,7 +447,7 @@ out1:
 out:
         mutex_unlock(&hpfs_i(dir)->i_mutex);
         mutex_unlock(&hpfs_i(inode)->i_parent_mutex);
-        unlock_kernel();
+        hpfs_unlock(dir->i_sb);
         return err;
 }
 
@@ -466,7 +465,7 @@ static int hpfs_rmdir(struct inode *dir, struct dentry *dentry)
         int r;
 
         hpfs_adjust_length(name, &len);
-        lock_kernel();
+        hpfs_lock(dir->i_sb);
         mutex_lock(&hpfs_i(inode)->i_parent_mutex);
         mutex_lock(&hpfs_i(dir)->i_mutex);
         err = -ENOENT;
@@ -508,7 +507,7 @@ out1:
 out:
         mutex_unlock(&hpfs_i(dir)->i_mutex);
         mutex_unlock(&hpfs_i(inode)->i_parent_mutex);
-        unlock_kernel();
+        hpfs_unlock(dir->i_sb);
         return err;
 }
 
@@ -521,21 +520,21 @@ static int hpfs_symlink_readpage(struct file *file, struct page *page)
         int err;
 
         err = -EIO;
-        lock_kernel();
+        hpfs_lock(i->i_sb);
         if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh)))
                 goto fail;
         err = hpfs_read_ea(i->i_sb, fnode, "SYMLINK", link, PAGE_SIZE);
         brelse(bh);
         if (err)
                 goto fail;
-        unlock_kernel();
+        hpfs_unlock(i->i_sb);
         SetPageUptodate(page);
         kunmap(page);
         unlock_page(page);
         return 0;
 
 fail:
-        unlock_kernel();
+        hpfs_unlock(i->i_sb);
         SetPageError(page);
         kunmap(page);
         unlock_page(page);
@@ -567,7 +566,7 @@ static int hpfs_rename(struct inode *old_dir, struct dentry *old_dentry,
         err = 0;
         hpfs_adjust_length(old_name, &old_len);
 
-        lock_kernel();
+        hpfs_lock(i->i_sb);
         /* order doesn't matter, due to VFS exclusion */
         mutex_lock(&hpfs_i(i)->i_parent_mutex);
         if (new_inode)
@@ -659,7 +658,7 @@ end1:
         mutex_unlock(&hpfs_i(i)->i_parent_mutex);
         if (new_inode)
                 mutex_unlock(&hpfs_i(new_inode)->i_parent_mutex);
-        unlock_kernel();
+        hpfs_unlock(i->i_sb);
         return err;
 }
 
diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c
index b30426b1fc97..c89b40808587 100644
--- a/fs/hpfs/super.c
+++ b/fs/hpfs/super.c
@@ -13,7 +13,6 @@
 #include <linux/statfs.h>
 #include <linux/magic.h>
 #include <linux/sched.h>
-#include <linux/smp_lock.h>
 #include <linux/bitmap.h>
 #include <linux/slab.h>
 
@@ -103,15 +102,11 @@ static void hpfs_put_super(struct super_block *s)
 {
         struct hpfs_sb_info *sbi = hpfs_sb(s);
 
-        lock_kernel();
-
         kfree(sbi->sb_cp_table);
         kfree(sbi->sb_bmp_dir);
         unmark_dirty(s);
         s->s_fs_info = NULL;
         kfree(sbi);
-
-        unlock_kernel();
 }
 
 unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
@@ -143,7 +138,7 @@ static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
         struct super_block *s = dentry->d_sb;
         struct hpfs_sb_info *sbi = hpfs_sb(s);
         u64 id = huge_encode_dev(s->s_bdev->bd_dev);
-        lock_kernel();
+        hpfs_lock(s);
 
         /*if (sbi->sb_n_free == -1) {*/
                 sbi->sb_n_free = count_bitmaps(s);
@@ -160,7 +155,7 @@ static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
         buf->f_fsid.val[1] = (u32)(id >> 32);
         buf->f_namelen = 254;
 
-        unlock_kernel();
+        hpfs_unlock(s);
 
         return 0;
 }
@@ -406,7 +401,7 @@ static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
         
         *flags |= MS_NOATIME;
         
-        lock_kernel();
+        hpfs_lock(s);
         lock_super(s);
         uid = sbi->sb_uid; gid = sbi->sb_gid;
         umask = 0777 & ~sbi->sb_mode;
@@ -441,12 +436,12 @@ static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
         replace_mount_options(s, new_opts);
 
         unlock_super(s);
-        unlock_kernel();
+        hpfs_unlock(s);
         return 0;
 
 out_err:
         unlock_super(s);
-        unlock_kernel();
+        hpfs_unlock(s);
         kfree(new_opts);
         return -EINVAL;
 }
@@ -484,13 +479,15 @@ static int hpfs_fill_super(struct super_block *s, void *options, int silent)
 
         int o;
 
-        lock_kernel();
+        if (num_possible_cpus() > 1) {
+                printk(KERN_ERR "HPFS is not SMP safe\n");
+                return -EINVAL;
+        }
 
         save_mount_options(s, options);
 
         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
         if (!sbi) {
-                unlock_kernel();
                 return -ENOMEM;
         }
         s->s_fs_info = sbi;
@@ -677,7 +674,6 @@ static int hpfs_fill_super(struct super_block *s, void *options, int silent)
                         root->i_blocks = 5;
                 hpfs_brelse4(&qbh);
         }
-        unlock_kernel();
         return 0;
 
 bail4:  brelse(bh2);
@@ -689,7 +685,6 @@ bail0:
         kfree(sbi->sb_cp_table);
         s->s_fs_info = NULL;
         kfree(sbi);
-        unlock_kernel();
         return -EINVAL;
 }