7 files changed, 72 insertions, 29 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 746b706206da..d7f8668b7a72 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5335,7 +5335,7 @@ S:	Maintained
 F:      drivers/scsi/u14-34f.c
 
 UBI FILE SYSTEM (UBIFS)
-M:      Artem Bityutskiy <dedekind@infradead.org>
+M:      Artem Bityutskiy <dedekind1@gmail.com>
 M:      Adrian Hunter <adrian.hunter@nokia.com>
 L:      linux-mtd@lists.infradead.org
 T:      git git://git.infradead.org/ubifs-2.6.git
@@ -5386,7 +5386,7 @@ F:	drivers/cdrom/cdrom.c
 F:      include/linux/cdrom.h
 
 UNSORTED BLOCK IMAGES (UBI)
-M:      Artem Bityutskiy <dedekind@infradead.org>
+M:      Artem Bityutskiy <dedekind1@gmail.com>
 W:      http://www.linux-mtd.infradead.org/
 L:      linux-mtd@lists.infradead.org
 T:      git git://git.infradead.org/ubi-2.6.git
diff --git a/drivers/mtd/ubi/kapi.c b/drivers/mtd/ubi/kapi.c
index 88a72e9c8beb..277786ebaa2c 100644
--- a/drivers/mtd/ubi/kapi.c
+++ b/drivers/mtd/ubi/kapi.c
@@ -22,6 +22,8 @@
 
 #include <linux/module.h>
 #include <linux/err.h>
+#include <linux/namei.h>
+#include <linux/fs.h>
 #include <asm/div64.h>
 #include "ubi.h"
 
@@ -280,6 +282,44 @@ struct ubi_volume_desc *ubi_open_volume_nm(int ubi_num, const char *name,
 EXPORT_SYMBOL_GPL(ubi_open_volume_nm);
 
 /**
+ * ubi_open_volume_path - open UBI volume by its character device node path.
+ * @pathname: volume character device node path
+ * @mode: open mode
+ *
+ * This function is similar to 'ubi_open_volume()', but opens a volume the path
+ * to its character device node.
+ */
+struct ubi_volume_desc *ubi_open_volume_path(const char *pathname, int mode)
+{
+        int error, ubi_num, vol_id;
+        struct ubi_volume_desc *ret;
+        struct inode *inode;
+        struct path path;
+
+        dbg_gen("open volume %s, mode %d", pathname, mode);
+
+        if (!pathname || !*pathname)
+                return ERR_PTR(-EINVAL);
+
+        error = kern_path(pathname, LOOKUP_FOLLOW, &path);
+        if (error)
+                return ERR_PTR(error);
+
+        inode = path.dentry->d_inode;
+        ubi_num = ubi_major2num(imajor(inode));
+        vol_id = iminor(inode) - 1;
+
+        if (vol_id >= 0 && ubi_num >= 0)
+                ret = ubi_open_volume(ubi_num, vol_id, mode);
+        else
+                ret = ERR_PTR(-ENODEV);
+
+        path_put(&path);
+        return ret;
+}
+EXPORT_SYMBOL_GPL(ubi_open_volume_path);
+
+/**
  * ubi_close_volume - close UBI volume.
  * @desc: volume descriptor
  */
diff --git a/drivers/mtd/ubi/upd.c b/drivers/mtd/ubi/upd.c
index 74fdc40c8627..c1d7b880c795 100644
--- a/drivers/mtd/ubi/upd.c
+++ b/drivers/mtd/ubi/upd.c
@@ -147,12 +147,14 @@ int ubi_start_update(struct ubi_device *ubi, struct ubi_volume *vol,
         }
 
         if (bytes == 0) {
+                err = ubi_wl_flush(ubi);
+                if (err)
+                        return err;
+
                 err = clear_update_marker(ubi, vol, 0);
                 if (err)
                         return err;
-                err = ubi_wl_flush(ubi);
-                if (!err)
-                        vol->updating = 0;
+                vol->updating = 0;
         }
 
         vol->upd_buf = vmalloc(ubi->leb_size);
@@ -362,16 +364,16 @@ int ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol,
 
         ubi_assert(vol->upd_received <= vol->upd_bytes);
         if (vol->upd_received == vol->upd_bytes) {
+                err = ubi_wl_flush(ubi);
+                if (err)
+                        return err;
                 /* The update is finished, clear the update marker */
                 err = clear_update_marker(ubi, vol, vol->upd_bytes);
                 if (err)
                         return err;
-                err = ubi_wl_flush(ubi);
-                if (err == 0) {
-                        vol->updating = 0;
-                        err = to_write;
-                        vfree(vol->upd_buf);
-                }
+                vol->updating = 0;
+                err = to_write;
+                vfree(vol->upd_buf);
         }
 
         return err;
diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c
index dbc093afd946..8a771c59ac3e 100644
--- a/fs/ubifs/debug.c
+++ b/fs/ubifs/debug.c
@@ -2014,7 +2014,7 @@ static int check_leaf(struct ubifs_info *c, struct ubifs_zbranch *zbr,
                 inum = key_inum_flash(c, &dent->key);
                 fscki1 = read_add_inode(c, priv, inum);
                 if (IS_ERR(fscki1)) {
-                        err = PTR_ERR(fscki);
+                        err = PTR_ERR(fscki1);
                         ubifs_err("error %d while processing entry node and "
                                   "trying to find parent inode node %lu",
                                   err, (unsigned long)inum);
diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index 1009adc8d602..39849f887e72 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -1389,7 +1389,6 @@ static ssize_t ubifs_aio_write(struct kiocb *iocb, const struct iovec *iov,
                                unsigned long nr_segs, loff_t pos)
 {
         int err;
-        ssize_t ret;
         struct inode *inode = iocb->ki_filp->f_mapping->host;
         struct ubifs_info *c = inode->i_sb->s_fs_info;
 
@@ -1397,17 +1396,7 @@ static ssize_t ubifs_aio_write(struct kiocb *iocb, const struct iovec *iov,
         if (err)
                 return err;
 
-        ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
-        if (ret < 0)
-                return ret;
-
-        if (ret > 0 && (IS_SYNC(inode) || iocb->ki_filp->f_flags & O_SYNC)) {
-                err = ubifs_sync_wbufs_by_inode(c, inode);
-                if (err)
-                        return err;
-        }
-
-        return ret;
+        return generic_file_aio_write(iocb, iov, nr_segs, pos);
 }
 
 static int ubifs_set_page_dirty(struct page *page)
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 333e181ee987..943ad5624530 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -1842,22 +1842,32 @@ const struct super_operations ubifs_super_operations = {
  * @name: UBI volume name
  * @mode: UBI volume open mode
  *
- * There are several ways to specify UBI volumes when mounting UBIFS:
- * o ubiX_Y    - UBI device number X, volume Y;
- * o ubiY      - UBI device number 0, volume Y;
+ * The primary method of mounting UBIFS is by specifying the UBI volume
+ * character device node path. However, UBIFS may also be mounted withoug any
+ * character device node using one of the following methods:
+ *
+ * o ubiX_Y    - mount UBI device number X, volume Y;
+ * o ubiY      - mount UBI device number 0, volume Y;
  * o ubiX:NAME - mount UBI device X, volume with name NAME;
  * o ubi:NAME  - mount UBI device 0, volume with name NAME.
  *
  * Alternative '!' separator may be used instead of ':' (because some shells
  * like busybox may interpret ':' as an NFS host name separator). This function
- * returns ubi volume object in case of success and a negative error code in
- * case of failure.
+ * returns UBI volume description object in case of success and a negative
+ * error code in case of failure.
  */
 static struct ubi_volume_desc *open_ubi(const char *name, int mode)
 {
+        struct ubi_volume_desc *ubi;
         int dev, vol;
         char *endptr;
 
+        /* First, try to open using the device node path method */
+        ubi = ubi_open_volume_path(name, mode);
+        if (!IS_ERR(ubi))
+                return ubi;
+
+        /* Try the "nodev" method */
         if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i')
                 return ERR_PTR(-EINVAL);
 
diff --git a/include/linux/mtd/ubi.h b/include/linux/mtd/ubi.h
index 6913b71d9ab2..b31bd9e9bca3 100644
--- a/include/linux/mtd/ubi.h
+++ b/include/linux/mtd/ubi.h
@@ -174,6 +174,8 @@ void ubi_get_volume_info(struct ubi_volume_desc *desc,
 struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode);
 struct ubi_volume_desc *ubi_open_volume_nm(int ubi_num, const char *name,
                                            int mode);
+struct ubi_volume_desc *ubi_open_volume_path(const char *pathname, int mode);
+
 int ubi_register_volume_notifier(struct notifier_block *nb,
                                  int ignore_existing);
 int ubi_unregister_volume_notifier(struct notifier_block *nb);