[XFS] kill xfs_mount_init

xfs_mount_init is inlined into xfs_fs_fill_super and allocation switched
to kzalloc. Plug a leak of the mount structure for most early mount
failures. Move xfs_icsb_init_counters to as late as possible in the mount
path and make sure to undo it so that no stale hotplug cpu notifiers are
left around on mount failures.

SGI-PV: 981951
SGI-Modid: xfs-linux-melb:xfs-kern:31196a

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>

3 files changed, 29 insertions, 46 deletions

diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c
index d13d883d0039..fe52e9276aad 100644
--- a/fs/xfs/linux-2.6/xfs_super.c
+++ b/fs/xfs/linux-2.6/xfs_super.c
@@ -1273,10 +1273,11 @@ xfs_fs_put_super(
         }
 
         xfs_unmountfs(mp);
+        xfs_icsb_destroy_counters(mp);
         xfs_close_devices(mp);
         xfs_qmops_put(mp);
         xfs_dmops_put(mp);
-        kmem_free(mp);
+        kfree(mp);
 }
 
 STATIC void
@@ -1733,14 +1734,20 @@ xfs_fs_fill_super(
         struct inode            *root;
         struct xfs_mount        *mp = NULL;
         struct xfs_mount_args   *args;
-        int                     flags = 0, error;
+        int                     flags = 0, error = ENOMEM;
 
         args = xfs_args_allocate(sb, silent);
         if (!args)
                 return -ENOMEM;
 
-        mp = xfs_mount_init();
+        mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
+        if (!mp)
+                goto out_free_args;
 
+        spin_lock_init(&mp->m_sb_lock);
+        mutex_init(&mp->m_ilock);
+        mutex_init(&mp->m_growlock);
+        atomic_set(&mp->m_active_trans, 0);
         INIT_LIST_HEAD(&mp->m_sync_list);
         spin_lock_init(&mp->m_sync_lock);
         init_waitqueue_head(&mp->m_wait_single_sync_task);
@@ -1753,7 +1760,7 @@ xfs_fs_fill_super(
 
         error = xfs_parseargs(mp, (char *)data, args, 0);
         if (error)
-                goto fail_vfsop;
+                goto out_free_mp;
 
         sb_min_blocksize(sb, BBSIZE);
         sb->s_export_op = &xfs_export_operations;
@@ -1762,7 +1769,7 @@ xfs_fs_fill_super(
 
         error = xfs_dmops_get(mp, args);
         if (error)
-                goto fail_vfsop;
+                goto out_free_mp;
         error = xfs_qmops_get(mp, args);
         if (error)
                 goto out_put_dmops;
@@ -1774,6 +1781,9 @@ xfs_fs_fill_super(
         if (error)
                 goto out_put_qmops;
 
+        if (xfs_icsb_init_counters(mp))
+                mp->m_flags |= XFS_MOUNT_NO_PERCPU_SB;
+
         /*
          * Setup flags based on mount(2) options and then the superblock
          */
@@ -1849,12 +1859,18 @@ xfs_fs_fill_super(
                 xfs_binval(mp->m_logdev_targp);
         if (mp->m_rtdev_targp)
                 xfs_binval(mp->m_rtdev_targp);
+ out_destroy_counters:
+        xfs_icsb_destroy_counters(mp);
         xfs_close_devices(mp);
  out_put_qmops:
         xfs_qmops_put(mp);
  out_put_dmops:
         xfs_dmops_put(mp);
-        goto fail_vfsop;
+ out_free_mp:
+        kfree(mp);
+ out_free_args:
+        kfree(args);
+        return -error;
 
  fail_vnrele:
         if (sb->s_root) {
@@ -1879,14 +1895,7 @@ xfs_fs_fill_super(
         IRELE(mp->m_rootip);
 
         xfs_unmountfs(mp);
-        xfs_close_devices(mp);
-        xfs_qmops_put(mp);
-        xfs_dmops_put(mp);
-        kmem_free(mp);
-
- fail_vfsop:
-        kfree(args);
-        return -error;
+        goto out_destroy_counters;
 }
 
 STATIC int
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index c67f8a9ae418..1bfaa204f689 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -51,7 +51,6 @@ STATIC void	xfs_unmountfs_wait(xfs_mount_t *);
 
 
 #ifdef HAVE_PERCPU_SB
-STATIC void     xfs_icsb_destroy_counters(xfs_mount_t *);
 STATIC void     xfs_icsb_balance_counter(xfs_mount_t *, xfs_sb_field_t,
                                                 int);
 STATIC void     xfs_icsb_balance_counter_locked(xfs_mount_t *, xfs_sb_field_t,
@@ -62,7 +61,6 @@ STATIC void	xfs_icsb_disable_counter(xfs_mount_t *, xfs_sb_field_t);
 
 #else
 
-#define xfs_icsb_destroy_counters(mp)                   do { } while (0)
 #define xfs_icsb_balance_counter(mp, a, b)              do { } while (0)
 #define xfs_icsb_balance_counter_locked(mp, a, b)       do { } while (0)
 #define xfs_icsb_modify_counters(mp, a, b, c)           do { } while (0)
@@ -125,33 +123,11 @@ static const struct {
 };
 
 /*
- * Return a pointer to an initialized xfs_mount structure.
- */
-xfs_mount_t *
-xfs_mount_init(void)
-{
-        xfs_mount_t *mp;
-
-        mp = kmem_zalloc(sizeof(xfs_mount_t), KM_SLEEP);
-
-        if (xfs_icsb_init_counters(mp)) {
-                mp->m_flags |= XFS_MOUNT_NO_PERCPU_SB;
-        }
-
-        spin_lock_init(&mp->m_sb_lock);
-        mutex_init(&mp->m_ilock);
-        mutex_init(&mp->m_growlock);
-        atomic_set(&mp->m_active_trans, 0);
-
-        return mp;
-}
-
-/*
  * Free up the resources associated with a mount structure.  Assume that
  * the structure was initially zeroed, so we can tell which fields got
  * initialized.
  */
-void
+STATIC void
 xfs_mount_free(
         xfs_mount_t     *mp)
 {
@@ -177,8 +153,6 @@ xfs_mount_free(
                 kmem_free(mp->m_rtname);
         if (mp->m_logname != NULL)
                 kmem_free(mp->m_logname);
-
-        xfs_icsb_destroy_counters(mp);
 }
 
 /*
@@ -2093,7 +2067,7 @@ xfs_icsb_reinit_counters(
         xfs_icsb_unlock(mp);
 }
 
-STATIC void
+void
 xfs_icsb_destroy_counters(
         xfs_mount_t     *mp)
 {
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 5acde7fd9c0a..96d8791e9e5a 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -210,12 +210,14 @@ typedef struct xfs_icsb_cnts {
 
 extern int      xfs_icsb_init_counters(struct xfs_mount *);
 extern void     xfs_icsb_reinit_counters(struct xfs_mount *);
+extern void     xfs_icsb_destroy_counters(struct xfs_mount *);
 extern void     xfs_icsb_sync_counters(struct xfs_mount *, int);
 extern void     xfs_icsb_sync_counters_locked(struct xfs_mount *, int);
 
 #else
-#define xfs_icsb_init_counters(mp)      (0)
-#define xfs_icsb_reinit_counters(mp)    do { } while (0)
+#define xfs_icsb_init_counters(mp)              (0)
+#define xfs_icsb_destroy_counters(mp)           do { } while (0)
+#define xfs_icsb_reinit_counters(mp)            do { } while (0)
 #define xfs_icsb_sync_counters(mp, flags)       do { } while (0)
 #define xfs_icsb_sync_counters_locked(mp, flags) do { } while (0)
 #endif
@@ -511,10 +513,8 @@ typedef struct xfs_mod_sb {
 #define XFS_MOUNT_ILOCK(mp)     mutex_lock(&((mp)->m_ilock))
 #define XFS_MOUNT_IUNLOCK(mp)   mutex_unlock(&((mp)->m_ilock))
 
-extern xfs_mount_t *xfs_mount_init(void);
 extern void     xfs_mod_sb(xfs_trans_t *, __int64_t);
 extern int      xfs_log_sbcount(xfs_mount_t *, uint);
-extern void     xfs_mount_free(xfs_mount_t *mp);
 extern int      xfs_mountfs(xfs_mount_t *mp, int);
 extern void     xfs_mountfs_check_barriers(xfs_mount_t *mp);