Backport of f2fs (from 3.8 rc4) on odroid-3.0.y

fs/Kconfig

@@ -212,6 +212,7 @@ source "fs/pstore/Kconfig"
 source "fs/sysv/Kconfig"
 source "fs/ufs/Kconfig"
 source "fs/exofs/Kconfig"
+source "fs/f2fs/Kconfig"
 
 endif # MISC_FILESYSTEMS
 

fs/Makefile

@@ -121,6 +121,7 @@ obj-$(CONFIG_DEBUG_FS) += debugfs/
 obj-$(CONFIG_OCFS2_FS) += ocfs2/
 obj-$(CONFIG_BTRFS_FS) += btrfs/
 obj-$(CONFIG_GFS2_FS) += gfs2/
+obj-$(CONFIG_F2FS_FS) += f2fs/
 obj-$(CONFIG_EXOFS_FS) += exofs/
 obj-$(CONFIG_CEPH_FS) += ceph/
 obj-$(CONFIG_PSTORE) += pstore/

fs/dcache.c

@@ -1532,7 +1532,7 @@ static struct dentry * __d_find_any_alias(struct inode *inode)
  return alias;
 }
 
-static struct dentry * d_find_any_alias(struct inode *inode)
+struct dentry * d_find_any_alias(struct inode *inode)
 {
  struct dentry *de;
 
@@ -1541,7 +1541,7 @@ static struct dentry * d_find_any_alias(struct inode *inode)
  spin_unlock(&inode->i_lock);
  return de;
 }
-
+EXPORT_SYMBOL(d_find_any_alias);
 
 /**
  * d_obtain_alias - find or allocate a dentry for a given inode

fs/f2fs/Kconfig

@@ -0,0 +1,53 @@
+config F2FS_FS
+ tristate "F2FS filesystem support (EXPERIMENTAL)"
+ depends on BLOCK
+ help
+ F2FS is based on Log-structured File System (LFS), which supports
+ versatile "flash-friendly" features. The design has been focused on
+ addressing the fundamental issues in LFS, which are snowball effect
+ of wandering tree and high cleaning overhead.
+
+ Since flash-based storages show different characteristics according to
+ the internal geometry or flash memory management schemes aka FTL, F2FS
+ and tools support various parameters not only for configuring on-disk
+ layout, but also for selecting allocation and cleaning algorithms.
+
+ If unsure, say N.
+
+config F2FS_STAT_FS
+ bool "F2FS Status Information"
+ depends on F2FS_FS && DEBUG_FS
+ default y
+ help
+ /sys/kernel/debug/f2fs/ contains information about all the partitions
+ mounted as f2fs. Each file shows the whole f2fs information.
+
+ /sys/kernel/debug/f2fs/status includes:
+ - major file system information managed by f2fs currently
+ - average SIT information about whole segments
+ - current memory footprint consumed by f2fs.
+
+config F2FS_FS_XATTR
+ bool "F2FS extended attributes"
+ depends on F2FS_FS
+ default y
+ help
+ Extended attributes are name:value pairs associated with inodes by
+ the kernel or by users (see the attr(5) manual page, or visit
+ <http://acl.bestbits.at/> for details).
+
+ If unsure, say N.
+
+config F2FS_FS_POSIX_ACL
+ bool "F2FS Access Control Lists"
+ depends on F2FS_FS_XATTR
+ select FS_POSIX_ACL
+ default y
+ help
+ Posix Access Control Lists (ACLs) support permissions for users and
+ gourps beyond the owner/group/world scheme.
+
+ To learn more about Access Control Lists, visit the POSIX ACLs for
+ Linux website <http://acl.bestbits.at/>.
+
+ If you don't know what Access Control Lists are, say N

fs/f2fs/Makefile

@@ -0,0 +1,7 @@
+obj-$(CONFIG_F2FS_FS) += f2fs.o
+
+f2fs-y := dir.o file.o inode.o namei.o hash.o super.o
+f2fs-y += checkpoint.o gc.o data.o node.o segment.o recovery.o
+f2fs-$(CONFIG_F2FS_STAT_FS) += debug.o
+f2fs-$(CONFIG_F2FS_FS_XATTR) += xattr.o
+f2fs-$(CONFIG_F2FS_FS_POSIX_ACL) += acl.o