Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull misc vfs updates from Al Viro:
 "Assorted bits and pieces from various people. No common topic in this
  pile, sorry"

* 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  fs/affs: add rename exchange
  fs/affs: add rename2 to prepare multiple methods
  Make stat/lstat/fstatat pass AT_NO_AUTOMOUNT to vfs_statx()
  fs: don't set *REFERENCED on single use objects
  fs: compat: Remove warning from COMPATIBLE_IOCTL
  remove pointless extern of atime_need_update_rcu()
  fs: completely ignore unknown open flags
  fs: add a VALID_OPEN_FLAGS
  fs: remove _submit_bh()
  fs: constify tree_descr arrays passed to simple_fill_super()
  fs: drop duplicate header percpu-rwsem.h
  fs/affs: bugfix: Write files greater than page size on OFS
  fs/affs: bugfix: enable writes on OFS disks
  fs/affs: remove node generation check
  fs/affs: import amigaffs.h
  fs/affs: bugfix: make symbolic links work again

28 files changed, 130 insertions, 74 deletions

diff --git a/drivers/infiniband/hw/qib/qib_fs.c b/drivers/infiniband/hw/qib/qib_fs.c
index f1e66ef..1d940a2 100644
--- a/drivers/infiniband/hw/qib/qib_fs.c
+++ b/drivers/infiniband/hw/qib/qib_fs.c
@@ -512,7 +512,7 @@ static int qibfs_fill_super(struct super_block *sb, void *data, int silent)
 	unsigned long flags;
 	int ret;
 
-	static struct tree_descr files[] = {
+	static const struct tree_descr files[] = {
 		[2] = {"driver_stats", &driver_ops[0], S_IRUGO},
 		[3] = {"driver_stats_names", &driver_ops[1], S_IRUGO},
 		{""},
diff --git a/drivers/xen/xenfs/super.c b/drivers/xen/xenfs/super.c
index 328c398..967f069 100644
--- a/drivers/xen/xenfs/super.c
+++ b/drivers/xen/xenfs/super.c
@@ -44,14 +44,14 @@ static const struct file_operations capabilities_file_ops = {
 
 static int xenfs_fill_super(struct super_block *sb, void *data, int silent)
 {
-	static struct tree_descr xenfs_files[] = {
+	static const struct tree_descr xenfs_files[] = {
 		[2] = { "xenbus", &xen_xenbus_fops, S_IRUSR|S_IWUSR },
 		{ "capabilities", &capabilities_file_ops, S_IRUGO },
 		{ "privcmd", &xen_privcmd_fops, S_IRUSR|S_IWUSR },
 		{""},
 	};
 
-	static struct tree_descr xenfs_init_files[] = {
+	static const struct tree_descr xenfs_init_files[] = {
 		[2] = { "xenbus", &xen_xenbus_fops, S_IRUSR|S_IWUSR },
 		{ "capabilities", &capabilities_file_ops, S_IRUGO },
 		{ "privcmd", &xen_privcmd_fops, S_IRUSR|S_IWUSR },
diff --git a/fs/affs/affs.h b/fs/affs/affs.h
index 2f8bab3..773749b 100644
--- a/fs/affs/affs.h
+++ b/fs/affs/affs.h
@@ -7,7 +7,7 @@
 #include <linux/types.h>
 #include <linux/fs.h>
 #include <linux/buffer_head.h>
-#include <linux/amigaffs.h>
+#include "amigaffs.h"
 #include <linux/mutex.h>
 #include <linux/workqueue.h>
 
@@ -173,7 +173,7 @@ extern int	affs_link(struct dentry *olddentry, struct inode *dir,
 			  struct dentry *dentry);
 extern int	affs_symlink(struct inode *dir, struct dentry *dentry,
 			     const char *symname);
-extern int	affs_rename(struct inode *old_dir, struct dentry *old_dentry,
+extern int	affs_rename2(struct inode *old_dir, struct dentry *old_dentry,
 			    struct inode *new_dir, struct dentry *new_dentry,
 			    unsigned int flags);
 
diff --git a/include/linux/amigaffs.h b/fs/affs/amigaffs.h
index 43b41c0..43b41c0 100644
--- a/include/linux/amigaffs.h
+++ b/fs/affs/amigaffs.h
diff --git a/fs/affs/dir.c b/fs/affs/dir.c
index f1e7294..591ecd7 100644
--- a/fs/affs/dir.c
+++ b/fs/affs/dir.c
@@ -35,7 +35,7 @@ const struct inode_operations affs_dir_inode_operations = {
 	.symlink	= affs_symlink,
 	.mkdir		= affs_mkdir,
 	.rmdir		= affs_rmdir,
-	.rename		= affs_rename,
+	.rename		= affs_rename2,
 	.setattr	= affs_notify_change,
 };
 
diff --git a/fs/affs/file.c b/fs/affs/file.c
index 0deec9c..196ee7f 100644
--- a/fs/affs/file.c
+++ b/fs/affs/file.c
@@ -499,7 +499,7 @@ affs_getemptyblk_ino(struct inode *inode, int block)
 }
 
 static int
-affs_do_readpage_ofs(struct page *page, unsigned to)
+affs_do_readpage_ofs(struct page *page, unsigned to, int create)
 {
 	struct inode *inode = page->mapping->host;
 	struct super_block *sb = inode->i_sb;
@@ -518,7 +518,7 @@ affs_do_readpage_ofs(struct page *page, unsigned to)
 	boff = tmp % bsize;
 
 	while (pos < to) {
-		bh = affs_bread_ino(inode, bidx, 0);
+		bh = affs_bread_ino(inode, bidx, create);
 		if (IS_ERR(bh))
 			return PTR_ERR(bh);
 		tmp = min(bsize - boff, to - pos);
@@ -620,7 +620,7 @@ affs_readpage_ofs(struct file *file, struct page *page)
 		memset(page_address(page) + to, 0, PAGE_SIZE - to);
 	}
 
-	err = affs_do_readpage_ofs(page, to);
+	err = affs_do_readpage_ofs(page, to, 0);
 	if (!err)
 		SetPageUptodate(page);
 	unlock_page(page);
@@ -657,7 +657,7 @@ static int affs_write_begin_ofs(struct file *file, struct address_space *mapping
 		return 0;
 
 	/* XXX: inefficient but safe in the face of short writes */
-	err = affs_do_readpage_ofs(page, PAGE_SIZE);
+	err = affs_do_readpage_ofs(page, PAGE_SIZE, 1);
 	if (err) {
 		unlock_page(page);
 		put_page(page);
@@ -679,7 +679,7 @@ static int affs_write_end_ofs(struct file *file, struct address_space *mapping,
 	int written;
 
 	from = pos & (PAGE_SIZE - 1);
-	to = pos + len;
+	to = from + len;
 	/*
 	 * XXX: not sure if this can handle short copies (len < copied), but
 	 * we don't have to, because the page should always be uptodate here,
diff --git a/fs/affs/inode.c b/fs/affs/inode.c
index abcc598..fd4ef3c 100644
--- a/fs/affs/inode.c
+++ b/fs/affs/inode.c
@@ -140,6 +140,7 @@ struct inode *affs_iget(struct super_block *sb, unsigned long ino)
 		inode->i_fop = &affs_file_operations;
 		break;
 	case ST_SOFTLINK:
+		inode->i_size = strlen((char *)AFFS_HEAD(bh)->table);
 		inode->i_mode |= S_IFLNK;
 		inode_nohighmem(inode);
 		inode->i_op = &affs_symlink_inode_operations;
diff --git a/fs/affs/namei.c b/fs/affs/namei.c
index 96dd1d0..46d3ace 100644
--- a/fs/affs/namei.c
+++ b/fs/affs/namei.c
@@ -365,6 +365,7 @@ affs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
 				symname++;
 	}
 	*p = 0;
+	inode->i_size = i + 1;
 	mark_buffer_dirty_inode(bh, inode);
 	affs_brelse(bh);
 	mark_inode_dirty(inode);
@@ -393,21 +394,14 @@ affs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
 	return affs_add_entry(dir, inode, dentry, ST_LINKFILE);
 }
 
-int
+static int
 affs_rename(struct inode *old_dir, struct dentry *old_dentry,
-	    struct inode *new_dir, struct dentry *new_dentry,
-	    unsigned int flags)
+	    struct inode *new_dir, struct dentry *new_dentry)
 {
 	struct super_block *sb = old_dir->i_sb;
 	struct buffer_head *bh = NULL;
 	int retval;
 
-	if (flags & ~RENAME_NOREPLACE)
-		return -EINVAL;
-
-	pr_debug("%s(old=%lu,\"%pd\" to new=%lu,\"%pd\")\n", __func__,
-		 old_dir->i_ino, old_dentry, new_dir->i_ino, new_dentry);
-
 	retval = affs_check_name(new_dentry->d_name.name,
 				 new_dentry->d_name.len,
 				 affs_nofilenametruncate(old_dentry));
@@ -447,6 +441,76 @@ done:
 	return retval;
 }
 
+static int
+affs_xrename(struct inode *old_dir, struct dentry *old_dentry,
+	     struct inode *new_dir, struct dentry *new_dentry)
+{
+
+	struct super_block *sb = old_dir->i_sb;
+	struct buffer_head *bh_old = NULL;
+	struct buffer_head *bh_new = NULL;
+	int retval;
+
+	bh_old = affs_bread(sb, d_inode(old_dentry)->i_ino);
+	if (!bh_old)
+		return -EIO;
+
+	bh_new = affs_bread(sb, d_inode(new_dentry)->i_ino);
+	if (!bh_new)
+		return -EIO;
+
+	/* Remove old header from its parent directory. */
+	affs_lock_dir(old_dir);
+	retval = affs_remove_hash(old_dir, bh_old);
+	affs_unlock_dir(old_dir);
+	if (retval)
+		goto done;
+
+	/* Remove new header from its parent directory. */
+	affs_lock_dir(new_dir);
+	retval = affs_remove_hash(new_dir, bh_new);
+	affs_unlock_dir(new_dir);
+	if (retval)
+		goto done;
+
+	/* Insert old into the new directory with the new name. */
+	affs_copy_name(AFFS_TAIL(sb, bh_old)->name, new_dentry);
+	affs_fix_checksum(sb, bh_old);
+	affs_lock_dir(new_dir);
+	retval = affs_insert_hash(new_dir, bh_old);
+	affs_unlock_dir(new_dir);
+
+	/* Insert new into the old directory with the old name. */
+	affs_copy_name(AFFS_TAIL(sb, bh_new)->name, old_dentry);
+	affs_fix_checksum(sb, bh_new);
+	affs_lock_dir(old_dir);
+	retval = affs_insert_hash(old_dir, bh_new);
+	affs_unlock_dir(old_dir);
+done:
+	mark_buffer_dirty_inode(bh_old, new_dir);
+	mark_buffer_dirty_inode(bh_new, old_dir);
+	affs_brelse(bh_old);
+	affs_brelse(bh_new);
+	return retval;
+}
+
+int affs_rename2(struct inode *old_dir, struct dentry *old_dentry,
+			struct inode *new_dir, struct dentry *new_dentry,
+			unsigned int flags)
+{
+
+	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
+		return -EINVAL;
+
+	pr_debug("%s(old=%lu,\"%pd\" to new=%lu,\"%pd\")\n", __func__,
+		 old_dir->i_ino, old_dentry, new_dir->i_ino, new_dentry);
+
+	if (flags & RENAME_EXCHANGE)
+		return affs_xrename(old_dir, old_dentry, new_dir, new_dentry);
+
+	return affs_rename(old_dir, old_dentry, new_dir, new_dentry);
+}
+
 static struct dentry *affs_get_parent(struct dentry *child)
 {
 	struct inode *parent;
@@ -477,11 +541,6 @@ static struct inode *affs_nfs_get_inode(struct super_block *sb, u64 ino,
 	if (IS_ERR(inode))
 		return ERR_CAST(inode);
 
-	if (generation && inode->i_generation != generation) {
-		iput(inode);
-		return ERR_PTR(-ESTALE);
-	}
-
 	return inode;
 }
 
diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
index bee1a36..f471809 100644
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -818,7 +818,7 @@ static const struct super_operations s_ops = {
 static int bm_fill_super(struct super_block *sb, void *data, int silent)
 {
 	int err;
-	static struct tree_descr bm_files[] = {
+	static const struct tree_descr bm_files[] = {
 		[2] = {"status", &bm_status_operations, S_IWUSR|S_IRUGO},
 		[3] = {"register", &bm_register_operations, S_IWUSR},
 		/* last one */ {""}
diff --git a/fs/buffer.c b/fs/buffer.c
index c3c7455..161be58 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -49,7 +49,6 @@
 
 static int fsync_buffers_list(spinlock_t *lock, struct list_head *list);
 static int submit_bh_wbc(int op, int op_flags, struct buffer_head *bh,
-			 unsigned long bio_flags,
 			 struct writeback_control *wbc);
 
 #define BH_ENTRY(list) list_entry((list), struct buffer_head, b_assoc_buffers)
@@ -1830,7 +1829,7 @@ int __block_write_full_page(struct inode *inode, struct page *page,
 	do {
 		struct buffer_head *next = bh->b_this_page;
 		if (buffer_async_write(bh)) {
-			submit_bh_wbc(REQ_OP_WRITE, write_flags, bh, 0, wbc);
+			submit_bh_wbc(REQ_OP_WRITE, write_flags, bh, wbc);
 			nr_underway++;
 		}
 		bh = next;
@@ -1884,7 +1883,7 @@ recover:
 		struct buffer_head *next = bh->b_this_page;
 		if (buffer_async_write(bh)) {
 			clear_buffer_dirty(bh);
-			submit_bh_wbc(REQ_OP_WRITE, write_flags, bh, 0, wbc);
+			submit_bh_wbc(REQ_OP_WRITE, write_flags, bh, wbc);
 			nr_underway++;
 		}
 		bh = next;
@@ -3092,7 +3091,7 @@ void guard_bio_eod(int op, struct bio *bio)
 }
 
 static int submit_bh_wbc(int op, int op_flags, struct buffer_head *bh,
-			 unsigned long bio_flags, struct writeback_control *wbc)
+			 struct writeback_control *wbc)
 {
 	struct bio *bio;
 
@@ -3127,7 +3126,6 @@ static int submit_bh_wbc(int op, int op_flags, struct buffer_head *bh,
 
 	bio->bi_end_io = end_bio_bh_io_sync;
 	bio->bi_private = bh;
-	bio->bi_flags |= bio_flags;
 
 	/* Take care of bh's that straddle the end of the device */
 	guard_bio_eod(op, bio);
@@ -3142,16 +3140,9 @@ static int submit_bh_wbc(int op, int op_flags, struct buffer_head *bh,
 	return 0;
 }
 
-int _submit_bh(int op, int op_flags, struct buffer_head *bh,
-	       unsigned long bio_flags)
+int submit_bh(int op, int op_flags, struct buffer_head *bh)
 {
-	return submit_bh_wbc(op, op_flags, bh, bio_flags, NULL);
-}
-EXPORT_SYMBOL_GPL(_submit_bh);
-
-int submit_bh(int op, int op_flags,  struct buffer_head *bh)
-{
-	return submit_bh_wbc(op, op_flags, bh, 0, NULL);
+	return submit_bh_wbc(op, op_flags, bh, NULL);
 }
 EXPORT_SYMBOL(submit_bh);
 
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 11d087b..6116d52 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -833,7 +833,7 @@ static int compat_ioctl_preallocate(struct file *file,
  */
 #define XFORM(i) (((i) ^ ((i) << 27) ^ ((i) << 17)) & 0xffffffff)
 
-#define COMPATIBLE_IOCTL(cmd) XFORM(cmd),
+#define COMPATIBLE_IOCTL(cmd) XFORM((u32)cmd),
 /* ioctl should not be warned about even if it's not implemented.
    Valid reasons to use this:
    - It is implemented with ->compat_ioctl on some device, but programs
diff --git a/fs/dcache.c b/fs/dcache.c
index 95d71ed..cddf397 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -419,6 +419,8 @@ static void dentry_lru_add(struct dentry *dentry)
 {
 	if (unlikely(!(dentry->d_flags & DCACHE_LRU_LIST)))
 		d_lru_add(dentry);
+	else if (unlikely(!(dentry->d_flags & DCACHE_REFERENCED)))
+		dentry->d_flags |= DCACHE_REFERENCED;
 }
 
 /**
@@ -779,8 +781,6 @@ repeat:
 			goto kill_it;
 	}
 
-	if (!(dentry->d_flags & DCACHE_REFERENCED))
-		dentry->d_flags |= DCACHE_REFERENCED;
 	dentry_lru_add(dentry);
 
 	dentry->d_lockref.count--;
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index 7fd4ec4..e892ae7 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -199,7 +199,7 @@ static const struct dentry_operations debugfs_dops = {
 
 static int debug_fill_super(struct super_block *sb, void *data, int silent)
 {
-	static struct tree_descr debug_files[] = {{""}};
+	static const struct tree_descr debug_files[] = {{""}};
 	struct debugfs_fs_info *fsi;
 	int err;
 
diff --git a/fs/fcntl.c b/fs/fcntl.c
index 8bd81c2..f4e7267 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -899,16 +899,10 @@ static int __init fcntl_init(void)
 	 * Exceptions: O_NONBLOCK is a two bit define on parisc; O_NDELAY
 	 * is defined as O_NONBLOCK on some platforms and not on others.
 	 */
-	BUILD_BUG_ON(21 - 1 /* for O_RDONLY being 0 */ != HWEIGHT32(
-		O_RDONLY	| O_WRONLY	| O_RDWR	|
-		O_CREAT		| O_EXCL	| O_NOCTTY	|
-		O_TRUNC		| O_APPEND	| /* O_NONBLOCK	| */
-		__O_SYNC	| O_DSYNC	| FASYNC	|
-		O_DIRECT	| O_LARGEFILE	| O_DIRECTORY	|
-		O_NOFOLLOW	| O_NOATIME	| O_CLOEXEC	|
-		__FMODE_EXEC	| O_PATH	| __O_TMPFILE	|
-		__FMODE_NONOTIFY
-		));
+	BUILD_BUG_ON(21 - 1 /* for O_RDONLY being 0 */ !=
+		HWEIGHT32(
+			(VALID_OPEN_FLAGS & ~(O_NONBLOCK | O_NDELAY)) |
+			__FMODE_EXEC | __FMODE_NONOTIFY));
 
 	fasync_cache = kmem_cache_create("fasync_cache",
 		sizeof(struct fasync_struct), 0, SLAB_PANIC, NULL);
diff --git a/fs/fuse/control.c b/fs/fuse/control.c
index 6e22748..b9ea99c 100644
--- a/fs/fuse/control.c
+++ b/fs/fuse/control.c
@@ -292,7 +292,7 @@ void fuse_ctl_remove_conn(struct fuse_conn *fc)
 
 static int fuse_ctl_fill_super(struct super_block *sb, void *data, int silent)
 {
-	struct tree_descr empty_descr = {""};
+	static const struct tree_descr empty_descr = {""};
 	struct fuse_conn *fc;
 	int err;
 
diff --git a/fs/inode.c b/fs/inode.c
index 6ad1edb..db59147 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -402,6 +402,8 @@ static void inode_lru_list_add(struct inode *inode)
 {
 	if (list_lru_add(&inode->i_sb->s_inode_lru, &inode->i_lru))
 		this_cpu_inc(nr_unused);
+	else
+		inode->i_state |= I_REFERENCED;
 }
 
 /*
@@ -1489,7 +1491,6 @@ static void iput_final(struct inode *inode)
 		drop = generic_drop_inode(inode);
 
 	if (!drop && (sb->s_flags & MS_ACTIVE)) {
-		inode->i_state |= I_REFERENCED;
 		inode_add_lru(inode);
 		spin_unlock(&inode->i_lock);
 		return;
diff --git a/fs/internal.h b/fs/internal.h
index 076751d..9676fe1 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -126,8 +126,6 @@ static inline bool atime_needs_update_rcu(const struct path *path,
 	return __atime_needs_update(path, inode, true);
 }
 
-extern bool atime_needs_update_rcu(const struct path *, struct inode *);
-
 /*
  * fs-writeback.c
  */
diff --git a/fs/libfs.c b/fs/libfs.c
index a8b62e5..a043953 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -507,7 +507,7 @@ EXPORT_SYMBOL(simple_write_end);
  * to pass it an appropriate max_reserved value to avoid collisions.
  */
 int simple_fill_super(struct super_block *s, unsigned long magic,
-		      struct tree_descr *files)
+		      const struct tree_descr *files)
 {
 	struct inode *inode;
 	struct dentry *root;
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 8bf8f66..6493df6 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -1146,7 +1146,7 @@ static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
 
 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
 {
-	static struct tree_descr nfsd_files[] = {
+	static const struct tree_descr nfsd_files[] = {
 		[NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
 		[NFSD_Export_features] = {"export_features",
 					&export_features_operations, S_IRUGO},
diff --git a/fs/open.c b/fs/open.c
index 4d23f72..373787a 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -900,6 +900,12 @@ static inline int build_open_flags(int flags, umode_t mode, struct open_flags *o
 	int lookup_flags = 0;
 	int acc_mode = ACC_MODE(flags);
 
+	/*
+	 * Clear out all open flags we don't know about so that we don't report
+	 * them in fcntl(F_GETFD) or similar interfaces.
+	 */
+	flags &= VALID_OPEN_FLAGS;
+
 	if (flags & (O_CREAT | __O_TMPFILE))
 		op->mode = (mode & S_IALLUGO) | S_IFREG;
 	else
diff --git a/fs/tracefs/inode.c b/fs/tracefs/inode.c
index 21d36d2..328e89c 100644
--- a/fs/tracefs/inode.c
+++ b/fs/tracefs/inode.c
@@ -266,7 +266,7 @@ static const struct super_operations tracefs_super_operations = {
 
 static int trace_fill_super(struct super_block *sb, void *data, int silent)
 {
-	static struct tree_descr trace_files[] = {{""}};
+	static const struct tree_descr trace_files[] = {{""}};
 	struct tracefs_fs_info *fsi;
 	int err;
 
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 79591c3..bd029e52 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -196,8 +196,6 @@ void ll_rw_block(int, int, int, struct buffer_head * bh[]);
 int sync_dirty_buffer(struct buffer_head *bh);
 int __sync_dirty_buffer(struct buffer_head *bh, int op_flags);
 void write_dirty_buffer(struct buffer_head *bh, int op_flags);
-int _submit_bh(int op, int op_flags, struct buffer_head *bh,
-	       unsigned long bio_flags);
 int submit_bh(int, int, struct buffer_head *);
 void write_boundary_block(struct block_device *bdev,
 			sector_t bblock, unsigned blocksize);
diff --git a/include/linux/fcntl.h b/include/linux/fcntl.h
index 76ce329..1b48d9c 100644
--- a/include/linux/fcntl.h
+++ b/include/linux/fcntl.h
@@ -3,6 +3,12 @@
 
 #include <uapi/linux/fcntl.h>
 
+/* list of all valid flags for the open/openat flags argument: */
+#define VALID_OPEN_FLAGS \
+	(O_RDONLY | O_WRONLY | O_RDWR | O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC | \
+	 O_APPEND | O_NDELAY | O_NONBLOCK | O_NDELAY | __O_SYNC | O_DSYNC | \
+	 FASYNC	| O_DIRECT | O_LARGEFILE | O_DIRECTORY | O_NOFOLLOW | \
+	 O_NOATIME | O_CLOEXEC | O_PATH | __O_TMPFILE)
 
 #ifndef force_o_largefile
 #define force_o_largefile() (BITS_PER_LONG != 32)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 249dad4..26488b4 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -29,7 +29,6 @@
 #include <linux/lockdep.h>
 #include <linux/percpu-rwsem.h>
 #include <linux/workqueue.h>
-#include <linux/percpu-rwsem.h>
 #include <linux/delayed_call.h>
 
 #include <asm/byteorder.h>
@@ -2925,17 +2924,19 @@ extern int vfs_statx_fd(unsigned int, struct kstat *, u32, unsigned int);
 
 static inline int vfs_stat(const char __user *filename, struct kstat *stat)
 {
-	return vfs_statx(AT_FDCWD, filename, 0, stat, STATX_BASIC_STATS);
+	return vfs_statx(AT_FDCWD, filename, AT_NO_AUTOMOUNT,
+			 stat, STATX_BASIC_STATS);
 }
 static inline int vfs_lstat(const char __user *name, struct kstat *stat)
 {
-	return vfs_statx(AT_FDCWD, name, AT_SYMLINK_NOFOLLOW,
+	return vfs_statx(AT_FDCWD, name, AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT,
 			 stat, STATX_BASIC_STATS);
 }
 static inline int vfs_fstatat(int dfd, const char __user *filename,
 			      struct kstat *stat, int flags)
 {
-	return vfs_statx(dfd, filename, flags, stat, STATX_BASIC_STATS);
+	return vfs_statx(dfd, filename, flags | AT_NO_AUTOMOUNT,
+			 stat, STATX_BASIC_STATS);
 }
 static inline int vfs_fstat(int fd, struct kstat *stat)
 {
@@ -3000,9 +3001,10 @@ extern const struct file_operations simple_dir_operations;
 extern const struct inode_operations simple_dir_inode_operations;
 extern void make_empty_dir_inode(struct inode *inode);
 extern bool is_empty_dir_inode(struct inode *inode);
-struct tree_descr { char *name; const struct file_operations *ops; int mode; };
+struct tree_descr { const char *name; const struct file_operations *ops; int mode; };
 struct dentry *d_alloc_name(struct dentry *, const char *);
-extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *);
+extern int simple_fill_super(struct super_block *, unsigned long,
+			     const struct tree_descr *);
 extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
 extern void simple_release_fs(struct vfsmount **mount, int *count);
 
diff --git a/kernel/bpf/inode.c b/kernel/bpf/inode.c
index fddcae8..9bbd334 100644
--- a/kernel/bpf/inode.c
+++ b/kernel/bpf/inode.c
@@ -429,7 +429,7 @@ static int bpf_parse_options(char *data, struct bpf_mount_opts *opts)
 
 static int bpf_fill_super(struct super_block *sb, void *data, int silent)
 {
-	static struct tree_descr bpf_rfiles[] = { { "" } };
+	static const struct tree_descr bpf_rfiles[] = { { "" } };
 	struct bpf_mount_opts opts;
 	struct inode *inode;
 	int ret;
diff --git a/security/inode.c b/security/inode.c
index 2cb1416..eccd58e 100644
--- a/security/inode.c
+++ b/security/inode.c
@@ -28,7 +28,7 @@ static int mount_count;
 
 static int fill_super(struct super_block *sb, void *data, int silent)
 {
-	static struct tree_descr files[] = {{""}};
+	static const struct tree_descr files[] = {{""}};
 
 	return simple_fill_super(sb, SECURITYFS_MAGIC, files);
 }
diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index ce71718..50062e7 100644
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -1496,7 +1496,7 @@ static const struct file_operations sel_avc_cache_stats_ops = {
 static int sel_make_avc_files(struct dentry *dir)
 {
 	int i;
-	static struct tree_descr files[] = {
+	static const struct tree_descr files[] = {
 		{ "cache_threshold",
 		  &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
 		{ "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
@@ -1805,7 +1805,7 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent)
 	struct inode *inode;
 	struct inode_security_struct *isec;
 
-	static struct tree_descr selinux_files[] = {
+	static const struct tree_descr selinux_files[] = {
 		[SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
 		[SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
 		[SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index 366b835..f6482e5 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -2855,7 +2855,7 @@ static int smk_fill_super(struct super_block *sb, void *data, int silent)
 	int rc;
 	struct inode *root_inode;
 
-	static struct tree_descr smack_files[] = {
+	static const struct tree_descr smack_files[] = {
 		[SMK_LOAD] = {
 			"load", &smk_load_ops, S_IRUGO|S_IWUSR},
 		[SMK_CIPSO] = {