Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (107 commits)
  vfs: use ERR_CAST for err-ptr tossing in lookup_instantiate_filp
  isofs: Remove global fs lock
  jffs2: fix IN_DELETE_SELF on overwriting rename() killing a directory
  fix IN_DELETE_SELF on overwriting rename() on ramfs et.al.
  mm/truncate.c: fix build for CONFIG_BLOCK not enabled
  fs:update the NOTE of the file_operations structure
  Remove dead code in dget_parent()
  AFS: Fix silly characters in a comment
  switch d_add_ci() to d_splice_alias() in "found negative" case as well
  simplify gfs2_lookup()
  jfs_lookup(): don't bother with . or ..
  get rid of useless dget_parent() in btrfs rename() and link()
  get rid of useless dget_parent() in fs/btrfs/ioctl.c
  fs: push i_mutex and filemap_write_and_wait down into ->fsync() handlers
  drivers: fix up various ->llseek() implementations
  fs: handle SEEK_HOLE/SEEK_DATA properly in all fs's that define their own llseek
  Ext4: handle SEEK_HOLE/SEEK_DATA generically
  Btrfs: implement our own ->llseek
  fs: add SEEK_HOLE and SEEK_DATA flags
  reiserfs: make reiserfs default to barrier=flush
  ...

Fix up trivial conflicts in fs/xfs/linux-2.6/xfs_super.c due to the new
shrinker callout for the inode cache, that clashed with the xfs code to
start the periodic workers later.

19 files changed, 245 insertions, 94 deletions

diff --git a/include/linux/anon_inodes.h b/include/linux/anon_inodes.h
index 69a21e0ebd33..8013a45242fe 100644
--- a/include/linux/anon_inodes.h
+++ b/include/linux/anon_inodes.h
@@ -8,6 +8,8 @@
 #ifndef _LINUX_ANON_INODES_H
 #define _LINUX_ANON_INODES_H
 
+struct file_operations;
+
 struct file *anon_inode_getfile(const char *name,
                                 const struct file_operations *fops,
                                 void *priv, int flags);
diff --git a/include/linux/atomic.h b/include/linux/atomic.h
index ee456c79b0e6..bc6615d4132b 100644
--- a/include/linux/atomic.h
+++ b/include/linux/atomic.h
@@ -34,6 +34,32 @@ static inline int atomic_inc_not_zero_hint(atomic_t *v, int hint)
 }
 #endif
 
+#ifndef atomic_inc_unless_negative
+static inline int atomic_inc_unless_negative(atomic_t *p)
+{
+        int v, v1;
+        for (v = 0; v >= 0; v = v1) {
+                v1 = atomic_cmpxchg(p, v, v + 1);
+                if (likely(v1 == v))
+                        return 1;
+        }
+        return 0;
+}
+#endif
+
+#ifndef atomic_dec_unless_positive
+static inline int atomic_dec_unless_positive(atomic_t *p)
+{
+        int v, v1;
+        for (v = 0; v <= 0; v = v1) {
+                v1 = atomic_cmpxchg(p, v, v - 1);
+                if (likely(v1 == v))
+                        return 1;
+        }
+        return 0;
+}
+#endif
+
 #ifndef CONFIG_ARCH_HAS_ATOMIC_OR
 static inline void atomic_or(int i, atomic_t *v)
 {
diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h
index 8845613fd7e3..fd88a3945aa1 100644
--- a/include/linux/binfmts.h
+++ b/include/linux/binfmts.h
@@ -111,6 +111,7 @@ extern int __must_check remove_arg_zero(struct linux_binprm *);
 extern int search_binary_handler(struct linux_binprm *, struct pt_regs *);
 extern int flush_old_exec(struct linux_binprm * bprm);
 extern void setup_new_exec(struct linux_binprm * bprm);
+extern void would_dump(struct linux_binprm *, struct file *);
 
 extern int suid_dumpable;
 #define SUID_DUMP_DISABLE       0       /* No setuid dumping */
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 19d90a55541d..3f22d8d6d8a3 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -216,6 +216,7 @@ struct dentry_operations {
 #define DCACHE_MOUNTED          0x10000 /* is a mountpoint */
 #define DCACHE_NEED_AUTOMOUNT   0x20000 /* handle automount on this dir */
 #define DCACHE_MANAGE_TRANSIT   0x40000 /* manage transit from this dirent */
+#define DCACHE_NEED_LOOKUP      0x80000 /* dentry requires i_op->lookup */
 #define DCACHE_MANAGED_DENTRY \
         (DCACHE_MOUNTED|DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT)
 
@@ -416,7 +417,12 @@ static inline bool d_mountpoint(struct dentry *dentry)
         return dentry->d_flags & DCACHE_MOUNTED;
 }
 
-extern struct dentry *lookup_create(struct nameidata *nd, int is_dir);
+static inline bool d_need_lookup(struct dentry *dentry)
+{
+        return dentry->d_flags & DCACHE_NEED_LOOKUP;
+}
+
+extern void d_clear_need_lookup(struct dentry *dentry);
 
 extern int sysctl_vfs_cache_pressure;
 
diff --git a/include/linux/ext3_fs.h b/include/linux/ext3_fs.h
index 5e06acf95d0f..0c473fd79acb 100644
--- a/include/linux/ext3_fs.h
+++ b/include/linux/ext3_fs.h
@@ -877,7 +877,7 @@ extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
 extern void ext3_htree_free_dir_info(struct dir_private_info *p);
 
 /* fsync.c */
-extern int ext3_sync_file(struct file *, int);
+extern int ext3_sync_file(struct file *, loff_t, loff_t, int);
 
 /* hash.c */
 extern int ext3fs_dirhash(const char *name, int len, struct
diff --git a/include/linux/fb.h b/include/linux/fb.h
index 6a8274877171..1d6836c498dd 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -1043,7 +1043,8 @@ extern void fb_deferred_io_open(struct fb_info *info,
                                 struct inode *inode,
                                 struct file *file);
 extern void fb_deferred_io_cleanup(struct fb_info *info);
-extern int fb_deferred_io_fsync(struct file *file, int datasync);
+extern int fb_deferred_io_fsync(struct file *file, loff_t start,
+                                loff_t end, int datasync);
 
 static inline bool fb_be_math(struct fb_info *info)
 {
diff --git a/include/linux/fs.h b/include/linux/fs.h
index b5b979247863..b224dc468a23 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -32,7 +32,9 @@
 #define SEEK_SET        0       /* seek relative to beginning of file */
 #define SEEK_CUR        1       /* seek relative to current file position */
 #define SEEK_END        2       /* seek relative to end of file */
-#define SEEK_MAX        SEEK_END
+#define SEEK_DATA       3       /* seek to the next data */
+#define SEEK_HOLE       4       /* seek to the next hole */
+#define SEEK_MAX        SEEK_HOLE
 
 struct fstrim_range {
         __u64 start;
@@ -63,6 +65,7 @@ struct inodes_stat_t {
 #define MAY_ACCESS 16
 #define MAY_OPEN 32
 #define MAY_CHDIR 64
+#define MAY_NOT_BLOCK 128       /* called from RCU mode, don't block */
 
 /*
  * flags in file.f_mode.  Note that FMODE_READ and FMODE_WRITE must correspond
@@ -392,8 +395,9 @@ struct inodes_stat_t {
 #include <linux/semaphore.h>
 #include <linux/fiemap.h>
 #include <linux/rculist_bl.h>
+#include <linux/shrinker.h>
+#include <linux/atomic.h>
 
-#include <asm/atomic.h>
 #include <asm/byteorder.h>
 
 struct export_operations;
@@ -777,7 +781,7 @@ struct inode {
         struct timespec         i_ctime;
         blkcnt_t                i_blocks;
         unsigned short          i_bytes;
-        struct rw_semaphore     i_alloc_sem;
+        atomic_t                i_dio_count;
         const struct file_operations    *i_fop; /* former ->i_op->default_file_ops */
         struct file_lock        *i_flock;
         struct address_space    *i_mapping;
@@ -1396,6 +1400,11 @@ struct super_block {
         struct list_head        s_dentry_lru;   /* unused dentry lru */
         int                     s_nr_dentry_unused;     /* # of dentry on lru */
 
+        /* s_inode_lru_lock protects s_inode_lru and s_nr_inodes_unused */
+        spinlock_t              s_inode_lru_lock ____cacheline_aligned_in_smp;
+        struct list_head        s_inode_lru;            /* unused inode lru */
+        int                     s_nr_inodes_unused;     /* # of inodes on lru */
+
         struct block_device     *s_bdev;
         struct backing_dev_info *s_bdi;
         struct mtd_info         *s_mtd;
@@ -1438,8 +1447,14 @@ struct super_block {
          * Saved pool identifier for cleancache (-1 means none)
          */
         int cleancache_poolid;
+
+        struct shrinker s_shrink;       /* per-sb shrinker handle */
 };
 
+/* superblock cache pruning functions */
+extern void prune_icache_sb(struct super_block *sb, int nr_to_scan);
+extern void prune_dcache_sb(struct super_block *sb, int nr_to_scan);
+
 extern struct timespec current_fs_time(struct super_block *sb);
 
 /*
@@ -1490,7 +1505,6 @@ extern void dentry_unhash(struct dentry *dentry);
 /*
  * VFS file helper functions.
  */
-extern int file_permission(struct file *, int);
 extern void inode_init_owner(struct inode *inode, const struct inode *dir,
                         mode_t mode);
 /*
@@ -1538,11 +1552,6 @@ struct block_device_operations;
 #define HAVE_COMPAT_IOCTL 1
 #define HAVE_UNLOCKED_IOCTL 1
 
-/*
- * NOTE:
- * all file operations except setlease can be called without
- * the big kernel lock held in all filesystems.
- */
 struct file_operations {
         struct module *owner;
         loff_t (*llseek) (struct file *, loff_t, int);
@@ -1558,7 +1567,7 @@ struct file_operations {
         int (*open) (struct inode *, struct file *);
         int (*flush) (struct file *, fl_owner_t id);
         int (*release) (struct inode *, struct file *);
-        int (*fsync) (struct file *, int datasync);
+        int (*fsync) (struct file *, loff_t, loff_t, int datasync);
         int (*aio_fsync) (struct kiocb *, int datasync);
         int (*fasync) (int, struct file *, int);
         int (*lock) (struct file *, int, struct file_lock *);
@@ -1573,13 +1582,11 @@ struct file_operations {
                           loff_t len);
 };
 
-#define IPERM_FLAG_RCU  0x0001
-
 struct inode_operations {
         struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
         void * (*follow_link) (struct dentry *, struct nameidata *);
-        int (*permission) (struct inode *, int, unsigned int);
-        int (*check_acl)(struct inode *, int, unsigned int);
+        int (*permission) (struct inode *, int);
+        int (*check_acl)(struct inode *, int);
 
         int (*readlink) (struct dentry *, char __user *,int);
         void (*put_link) (struct dentry *, struct nameidata *, void *);
@@ -1645,6 +1652,8 @@ struct super_operations {
         ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
 #endif
         int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
+        int (*nr_cached_objects)(struct super_block *);
+        void (*free_cached_objects)(struct super_block *, int);
 };
 
 /*
@@ -1693,6 +1702,10 @@ struct super_operations {
  *                      set during data writeback, and cleared with a wakeup
  *                      on the bit address once it is done.
  *
+ * I_REFERENCED         Marks the inode as recently references on the LRU list.
+ *
+ * I_DIO_WAKEUP         Never set.  Only used as a key for wait_on_bit().
+ *
  * Q: What is the difference between I_WILL_FREE and I_FREEING?
  */
 #define I_DIRTY_SYNC            (1 << 0)
@@ -1706,6 +1719,8 @@ struct super_operations {
 #define __I_SYNC                7
 #define I_SYNC                  (1 << __I_SYNC)
 #define I_REFERENCED            (1 << 8)
+#define __I_DIO_WAKEUP          9
+#define I_DIO_WAKEUP            (1 << I_DIO_WAKEUP)
 
 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
 
@@ -1816,7 +1831,6 @@ struct file_system_type {
         struct lock_class_key i_lock_key;
         struct lock_class_key i_mutex_key;
         struct lock_class_key i_mutex_dir_key;
-        struct lock_class_key i_alloc_sem_key;
 };
 
 extern struct dentry *mount_ns(struct file_system_type *fs_type, int flags,
@@ -1837,6 +1851,8 @@ void kill_litter_super(struct super_block *sb);
 void deactivate_super(struct super_block *sb);
 void deactivate_locked_super(struct super_block *sb);
 int set_anon_super(struct super_block *s, void *data);
+int get_anon_bdev(dev_t *);
+void free_anon_bdev(dev_t);
 struct super_block *sget(struct file_system_type *type,
                         int (*test)(struct super_block *,void *),
                         int (*set)(struct super_block *,void *),
@@ -2188,16 +2204,38 @@ extern sector_t bmap(struct inode *, sector_t);
 #endif
 extern int notify_change(struct dentry *, struct iattr *);
 extern int inode_permission(struct inode *, int);
-extern int generic_permission(struct inode *, int, unsigned int,
-                int (*check_acl)(struct inode *, int, unsigned int));
+extern int generic_permission(struct inode *, int);
 
 static inline bool execute_ok(struct inode *inode)
 {
         return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);
 }
 
-extern int get_write_access(struct inode *);
-extern int deny_write_access(struct file *);
+/*
+ * get_write_access() gets write permission for a file.
+ * put_write_access() releases this write permission.
+ * This is used for regular files.
+ * We cannot support write (and maybe mmap read-write shared) accesses and
+ * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode
+ * can have the following values:
+ * 0: no writers, no VM_DENYWRITE mappings
+ * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist
+ * > 0: (i_writecount) users are writing to the file.
+ *
+ * Normally we operate on that counter with atomic_{inc,dec} and it's safe
+ * except for the cases where we don't hold i_writecount yet. Then we need to
+ * use {get,deny}_write_access() - these functions check the sign and refuse
+ * to do the change if sign is wrong.
+ */
+static inline int get_write_access(struct inode *inode)
+{
+        return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY;
+}
+static inline int deny_write_access(struct file *file)
+{
+        struct inode *inode = file->f_path.dentry->d_inode;
+        return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY;
+}
 static inline void put_write_access(struct inode * inode)
 {
         atomic_dec(&inode->i_writecount);
@@ -2317,7 +2355,8 @@ extern int generic_segment_checks(const struct iovec *iov,
 /* fs/block_dev.c */
 extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
                                 unsigned long nr_segs, loff_t pos);
-extern int blkdev_fsync(struct file *filp, int datasync);
+extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end,
+                        int datasync);
 
 /* fs/splice.c */
 extern ssize_t generic_file_splice_read(struct file *, loff_t *,
@@ -2368,6 +2407,8 @@ enum {
 };
 
 void dio_end_io(struct bio *bio, int error);
+void inode_dio_wait(struct inode *inode);
+void inode_dio_done(struct inode *inode);
 
 ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
         struct block_device *bdev, const struct iovec *iov, loff_t offset,
@@ -2375,14 +2416,17 @@ ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
         dio_submit_t submit_io, int flags);
 
 static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
-        struct inode *inode, struct block_device *bdev, const struct iovec *iov,
-        loff_t offset, unsigned long nr_segs, get_block_t get_block,
-        dio_iodone_t end_io)
+                struct inode *inode, const struct iovec *iov, loff_t offset,
+                unsigned long nr_segs, get_block_t get_block)
 {
-        return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
-                                    nr_segs, get_block, end_io, NULL,
+        return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
+                                    offset, nr_segs, get_block, NULL, NULL,
                                     DIO_LOCKING | DIO_SKIP_HOLES);
 }
+#else
+static inline void inode_dio_wait(struct inode *inode)
+{
+}
 #endif
 
 extern const struct file_operations generic_ro_fops;
@@ -2432,6 +2476,8 @@ extern struct super_block *get_active_super(struct block_device *bdev);
 extern struct super_block *user_get_super(dev_t);
 extern void drop_super(struct super_block *sb);
 extern void iterate_supers(void (*)(struct super_block *, void *), void *);
+extern void iterate_supers_type(struct file_system_type *,
+                                void (*)(struct super_block *, void *), void *);
 
 extern int dcache_dir_open(struct inode *, struct file *);
 extern int dcache_dir_close(struct inode *, struct file *);
@@ -2444,7 +2490,7 @@ extern int simple_link(struct dentry *, struct inode *, struct dentry *);
 extern int simple_unlink(struct inode *, struct dentry *);
 extern int simple_rmdir(struct inode *, struct dentry *);
 extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
-extern int noop_fsync(struct file *, int);
+extern int noop_fsync(struct file *, loff_t, loff_t, int);
 extern int simple_empty(struct dentry *);
 extern int simple_readpage(struct file *file, struct page *page);
 extern int simple_write_begin(struct file *file, struct address_space *mapping,
@@ -2469,7 +2515,7 @@ extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
 extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos,
                 const void __user *from, size_t count);
 
-extern int generic_file_fsync(struct file *, int);
+extern int generic_file_fsync(struct file *, loff_t, loff_t, int);
 
 extern int generic_check_addressable(unsigned, u64);
 
diff --git a/include/linux/generic_acl.h b/include/linux/generic_acl.h
index 0437e377b555..574bea4013b6 100644
--- a/include/linux/generic_acl.h
+++ b/include/linux/generic_acl.h
@@ -10,6 +10,6 @@ extern const struct xattr_handler generic_acl_default_handler;
 
 int generic_acl_init(struct inode *, struct inode *);
 int generic_acl_chmod(struct inode *);
-int generic_check_acl(struct inode *inode, int mask, unsigned int flags);
+int generic_check_acl(struct inode *inode, int mask);
 
 #endif /* LINUX_GENERIC_ACL_H */
diff --git a/include/linux/mm.h b/include/linux/mm.h
index c70a326b8f26..8a45ad22a170 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -15,6 +15,7 @@
 #include <linux/range.h>
 #include <linux/pfn.h>
 #include <linux/bit_spinlock.h>
+#include <linux/shrinker.h>
 
 struct mempolicy;
 struct anon_vma;
@@ -1121,44 +1122,6 @@ static inline void sync_mm_rss(struct task_struct *task, struct mm_struct *mm)
 }
 #endif
 
-/*
- * This struct is used to pass information from page reclaim to the shrinkers.
- * We consolidate the values for easier extention later.
- */
-struct shrink_control {
-        gfp_t gfp_mask;
-
-        /* How many slab objects shrinker() should scan and try to reclaim */
-        unsigned long nr_to_scan;
-};
-
-/*
- * A callback you can register to apply pressure to ageable caches.
- *
- * 'sc' is passed shrink_control which includes a count 'nr_to_scan'
- * and a 'gfpmask'.  It should look through the least-recently-used
- * 'nr_to_scan' entries and attempt to free them up.  It should return
- * the number of objects which remain in the cache.  If it returns -1, it means
- * it cannot do any scanning at this time (eg. there is a risk of deadlock).
- *
- * The 'gfpmask' refers to the allocation we are currently trying to
- * fulfil.
- *
- * Note that 'shrink' will be passed nr_to_scan == 0 when the VM is
- * querying the cache size, so a fastpath for that case is appropriate.
- */
-struct shrinker {
-        int (*shrink)(struct shrinker *, struct shrink_control *sc);
-        int seeks;      /* seeks to recreate an obj */
-
-        /* These are for internal use */
-        struct list_head list;
-        long nr;        /* objs pending delete */
-};
-#define DEFAULT_SEEKS 2 /* A good number if you don't know better. */
-extern void register_shrinker(struct shrinker *);
-extern void unregister_shrinker(struct shrinker *);
-
 int vma_wants_writenotify(struct vm_area_struct *vma);
 
 extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr,
diff --git a/include/linux/mnt_namespace.h b/include/linux/mnt_namespace.h
index 0b89efc6f215..29304855652d 100644
--- a/include/linux/mnt_namespace.h
+++ b/include/linux/mnt_namespace.h
@@ -18,7 +18,6 @@ struct proc_mounts {
         struct seq_file m; /* must be the first element */
         struct mnt_namespace *ns;
         struct path root;
-        int event;
 };
 
 struct fs_struct;
diff --git a/include/linux/namei.h b/include/linux/namei.h
index eba45ea10298..76fe2c62ae71 100644
--- a/include/linux/namei.h
+++ b/include/linux/namei.h
@@ -48,7 +48,6 @@ enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
  */
 #define LOOKUP_FOLLOW           0x0001
 #define LOOKUP_DIRECTORY        0x0002
-#define LOOKUP_CONTINUE         0x0004
 
 #define LOOKUP_PARENT           0x0010
 #define LOOKUP_REVAL            0x0020
@@ -75,9 +74,11 @@ extern int user_path_at(int, const char __user *, unsigned, struct path *);
 
 extern int kern_path(const char *, unsigned, struct path *);
 
+extern struct dentry *kern_path_create(int, const char *, struct path *, int);
+extern struct dentry *user_path_create(int, const char __user *, struct path *, int);
 extern int kern_path_parent(const char *, struct nameidata *);
 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
-                           const char *, unsigned int, struct nameidata *);
+                           const char *, unsigned int, struct path *);
 
 extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
                 int (*open)(struct inode *, struct file *));
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 1b93b9c60e55..8b579beb6358 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -85,7 +85,7 @@ struct nfs_lock_context {
 struct nfs4_state;
 struct nfs_open_context {
         struct nfs_lock_context lock_context;
-        struct path path;
+        struct dentry *dentry;
         struct rpc_cred *cred;
         struct nfs4_state *state;
         fmode_t mode;
@@ -360,7 +360,7 @@ extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
-extern int nfs_permission(struct inode *, int, unsigned int);
+extern int nfs_permission(struct inode *, int);
 extern int nfs_open(struct inode *, struct file *);
 extern int nfs_release(struct inode *, struct file *);
 extern int nfs_attribute_timeout(struct inode *inode);
@@ -372,7 +372,7 @@ extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
 extern void put_nfs_open_context(struct nfs_open_context *ctx);
 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode);
-extern struct nfs_open_context *alloc_nfs_open_context(struct path *path, struct rpc_cred *cred, fmode_t f_mode);
+extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred, fmode_t f_mode);
 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
 extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
 extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
diff --git a/include/linux/nsproxy.h b/include/linux/nsproxy.h
index 50d20aba57d3..cc37a55ad004 100644
--- a/include/linux/nsproxy.h
+++ b/include/linux/nsproxy.h
@@ -68,6 +68,7 @@ void switch_task_namespaces(struct task_struct *tsk, struct nsproxy *new);
 void free_nsproxy(struct nsproxy *ns);
 int unshare_nsproxy_namespaces(unsigned long, struct nsproxy **,
         struct fs_struct *);
+int __init nsproxy_cache_init(void);
 
 static inline void put_nsproxy(struct nsproxy *ns)
 {
diff --git a/include/linux/reiserfs_xattr.h b/include/linux/reiserfs_xattr.h
index 6deef5dc95fb..57958c0e1d38 100644
--- a/include/linux/reiserfs_xattr.h
+++ b/include/linux/reiserfs_xattr.h
@@ -41,10 +41,11 @@ int reiserfs_xattr_init(struct super_block *sb, int mount_flags);
 int reiserfs_lookup_privroot(struct super_block *sb);
 int reiserfs_delete_xattrs(struct inode *inode);
 int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs);
-int reiserfs_permission(struct inode *inode, int mask, unsigned int flags);
+int reiserfs_permission(struct inode *inode, int mask);
 
 #ifdef CONFIG_REISERFS_FS_XATTR
 #define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir)
+int reiserfs_check_acl(struct inode *inode, int mask);
 ssize_t reiserfs_getxattr(struct dentry *dentry, const char *name,
                           void *buffer, size_t size);
 int reiserfs_setxattr(struct dentry *dentry, const char *name,
@@ -122,6 +123,7 @@ static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
 #define reiserfs_setxattr NULL
 #define reiserfs_listxattr NULL
 #define reiserfs_removexattr NULL
+#define reiserfs_check_acl NULL
 
 static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
 {
diff --git a/include/linux/rwsem.h b/include/linux/rwsem.h
index a8afe9cd000c..77950dfa0a9e 100644
--- a/include/linux/rwsem.h
+++ b/include/linux/rwsem.h
@@ -124,19 +124,9 @@ extern void downgrade_write(struct rw_semaphore *sem);
  */
 extern void down_read_nested(struct rw_semaphore *sem, int subclass);
 extern void down_write_nested(struct rw_semaphore *sem, int subclass);
-/*
- * Take/release a lock when not the owner will release it.
- *
- * [ This API should be avoided as much as possible - the
- *   proper abstraction for this case is completions. ]
- */
-extern void down_read_non_owner(struct rw_semaphore *sem);
-extern void up_read_non_owner(struct rw_semaphore *sem);
 #else
 # define down_read_nested(sem, subclass)                down_read(sem)
 # define down_write_nested(sem, subclass)       down_write(sem)
-# define down_read_non_owner(sem)               down_read(sem)
-# define up_read_non_owner(sem)                 up_read(sem)
 #endif
 
 #endif /* _LINUX_RWSEM_H */
diff --git a/include/linux/security.h b/include/linux/security.h
index 8ce59ef3e5af..ebd2a53a3d07 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -1456,7 +1456,7 @@ struct security_operations {
                              struct inode *new_dir, struct dentry *new_dentry);
         int (*inode_readlink) (struct dentry *dentry);
         int (*inode_follow_link) (struct dentry *dentry, struct nameidata *nd);
-        int (*inode_permission) (struct inode *inode, int mask, unsigned flags);
+        int (*inode_permission) (struct inode *inode, int mask);
         int (*inode_setattr)    (struct dentry *dentry, struct iattr *attr);
         int (*inode_getattr) (struct vfsmount *mnt, struct dentry *dentry);
         int (*inode_setxattr) (struct dentry *dentry, const char *name,
@@ -1720,7 +1720,6 @@ int security_inode_rename(struct inode *old_dir, struct dentry *old_dentry,
 int security_inode_readlink(struct dentry *dentry);
 int security_inode_follow_link(struct dentry *dentry, struct nameidata *nd);
 int security_inode_permission(struct inode *inode, int mask);
-int security_inode_exec_permission(struct inode *inode, unsigned int flags);
 int security_inode_setattr(struct dentry *dentry, struct iattr *attr);
 int security_inode_getattr(struct vfsmount *mnt, struct dentry *dentry);
 int security_inode_setxattr(struct dentry *dentry, const char *name,
@@ -2113,12 +2112,6 @@ static inline int security_inode_permission(struct inode *inode, int mask)
         return 0;
 }
 
-static inline int security_inode_exec_permission(struct inode *inode,
-                                                  unsigned int flags)
-{
-        return 0;
-}
-
 static inline int security_inode_setattr(struct dentry *dentry,
                                           struct iattr *attr)
 {
diff --git a/include/linux/seq_file.h b/include/linux/seq_file.h
index 03c0232b4169..be720cd2038d 100644
--- a/include/linux/seq_file.h
+++ b/include/linux/seq_file.h
@@ -23,6 +23,7 @@ struct seq_file {
         u64 version;
         struct mutex lock;
         const struct seq_operations *op;
+        int poll_event;
         void *private;
 };
 
diff --git a/include/linux/shrinker.h b/include/linux/shrinker.h
new file mode 100644
index 000000000000..790651b4e5ba
--- /dev/null
+++ b/include/linux/shrinker.h
@@ -0,0 +1,42 @@
+#ifndef _LINUX_SHRINKER_H
+#define _LINUX_SHRINKER_H
+
+/*
+ * This struct is used to pass information from page reclaim to the shrinkers.
+ * We consolidate the values for easier extention later.
+ */
+struct shrink_control {
+        gfp_t gfp_mask;
+
+        /* How many slab objects shrinker() should scan and try to reclaim */
+        unsigned long nr_to_scan;
+};
+
+/*
+ * A callback you can register to apply pressure to ageable caches.
+ *
+ * 'sc' is passed shrink_control which includes a count 'nr_to_scan'
+ * and a 'gfpmask'.  It should look through the least-recently-used
+ * 'nr_to_scan' entries and attempt to free them up.  It should return
+ * the number of objects which remain in the cache.  If it returns -1, it means
+ * it cannot do any scanning at this time (eg. there is a risk of deadlock).
+ *
+ * The 'gfpmask' refers to the allocation we are currently trying to
+ * fulfil.
+ *
+ * Note that 'shrink' will be passed nr_to_scan == 0 when the VM is
+ * querying the cache size, so a fastpath for that case is appropriate.
+ */
+struct shrinker {
+        int (*shrink)(struct shrinker *, struct shrink_control *sc);
+        int seeks;      /* seeks to recreate an obj */
+        long batch;     /* reclaim batch size, 0 = default */
+
+        /* These are for internal use */
+        struct list_head list;
+        long nr;        /* objs pending delete */
+};
+#define DEFAULT_SEEKS 2 /* A good number if you don't know better. */
+extern void register_shrinker(struct shrinker *);
+extern void unregister_shrinker(struct shrinker *);
+#endif
diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h
index b2c33bd955fa..36851f7f13da 100644
--- a/include/trace/events/vmscan.h
+++ b/include/trace/events/vmscan.h
@@ -179,6 +179,83 @@ DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_memcg_softlimit_re
         TP_ARGS(nr_reclaimed)
 );
 
+TRACE_EVENT(mm_shrink_slab_start,
+        TP_PROTO(struct shrinker *shr, struct shrink_control *sc,
+                long nr_objects_to_shrink, unsigned long pgs_scanned,
+                unsigned long lru_pgs, unsigned long cache_items,
+                unsigned long long delta, unsigned long total_scan),
+
+        TP_ARGS(shr, sc, nr_objects_to_shrink, pgs_scanned, lru_pgs,
+                cache_items, delta, total_scan),
+
+        TP_STRUCT__entry(
+                __field(struct shrinker *, shr)
+                __field(void *, shrink)
+                __field(long, nr_objects_to_shrink)
+                __field(gfp_t, gfp_flags)
+                __field(unsigned long, pgs_scanned)
+                __field(unsigned long, lru_pgs)
+                __field(unsigned long, cache_items)
+                __field(unsigned long long, delta)
+                __field(unsigned long, total_scan)
+        ),
+
+        TP_fast_assign(
+                __entry->shr = shr;
+                __entry->shrink = shr->shrink;
+                __entry->nr_objects_to_shrink = nr_objects_to_shrink;
+                __entry->gfp_flags = sc->gfp_mask;
+                __entry->pgs_scanned = pgs_scanned;
+                __entry->lru_pgs = lru_pgs;
+                __entry->cache_items = cache_items;
+                __entry->delta = delta;
+                __entry->total_scan = total_scan;
+        ),
+
+        TP_printk("%pF %p: objects to shrink %ld gfp_flags %s pgs_scanned %ld lru_pgs %ld cache items %ld delta %lld total_scan %ld",
+                __entry->shrink,
+                __entry->shr,
+                __entry->nr_objects_to_shrink,
+                show_gfp_flags(__entry->gfp_flags),
+                __entry->pgs_scanned,
+                __entry->lru_pgs,
+                __entry->cache_items,
+                __entry->delta,
+                __entry->total_scan)
+);
+
+TRACE_EVENT(mm_shrink_slab_end,
+        TP_PROTO(struct shrinker *shr, int shrinker_retval,
+                long unused_scan_cnt, long new_scan_cnt),
+
+        TP_ARGS(shr, shrinker_retval, unused_scan_cnt, new_scan_cnt),
+
+        TP_STRUCT__entry(
+                __field(struct shrinker *, shr)
+                __field(void *, shrink)
+                __field(long, unused_scan)
+                __field(long, new_scan)
+                __field(int, retval)
+                __field(long, total_scan)
+        ),
+
+        TP_fast_assign(
+                __entry->shr = shr;
+                __entry->shrink = shr->shrink;
+                __entry->unused_scan = unused_scan_cnt;
+                __entry->new_scan = new_scan_cnt;
+                __entry->retval = shrinker_retval;
+                __entry->total_scan = new_scan_cnt - unused_scan_cnt;
+        ),
+
+        TP_printk("%pF %p: unused scan count %ld new scan count %ld total_scan %ld last shrinker return val %d",
+                __entry->shrink,
+                __entry->shr,
+                __entry->unused_scan,
+                __entry->new_scan,
+                __entry->total_scan,
+                __entry->retval)
+);
 
 DECLARE_EVENT_CLASS(mm_vmscan_lru_isolate_template,