Merge cantab.net:/home/src/bklinux-2.6

into cantab.net:/home/src/ntfs-2.6

Documentation/filesystems/ntfs.txt

@@ -272,6 +272,8 @@ ChangeLog
 
 Note, a technical ChangeLog aimed at kernel hackers is in fs/ntfs/ChangeLog.
 
+2.1.7:
+	- Enable NFS exporting of mounted NTFS volumes.
 2.1.6:
 	- Fix minor bug in handling of compressed directories that fixes the
 	  erroneous "du" and "stat" output people reported.

fs/ntfs/ChangeLog

 ToDo:
 	- Find and fix bugs.
-	- Enable NFS exporting of NTFS.
 	- Implement aops->set_page_dirty() in order to take control of buffer
 	  dirtying. Not having it means if page_has_buffers(), all buffers
 	  will be dirtied with the page. And if not they won't be. That is
@@ -20,6 +19,24 @@ ToDo:
 	  sufficient for synchronisation here. We then just need to make sure
 	  ntfs_readpage/writepage/truncate interoperate properly with us.
 
+2.1.7 - Enable NFS exporting of mounted NTFS volumes.
+
+	- Set i_generation in the VFS inode from the seq_no of the NTFS inode.
+	- Make ntfs_lookup() NFS export safe, i.e. use d_splice_alias(), etc.
+	- Implement ->get_dentry() in fs/ntfs/namei.c::ntfs_get_dentry() as the
+	  default doesn't allow inode number 0 which is a valid inode on NTFS
+	  and even if it did allow that it uses iget() instead of ntfs_iget()
+	  which makes it useless for us.
+	- Implement ->get_parent() in fs/ntfs/namei.c::ntfs_get_parent() as the
+	  default just returns -EACCES which is not very useful.
+	- Define export operations (->s_export_op) for NTFS (ntfs_export_ops)
+	  and set them up in the super block at mount time (super.c) this
+	  allows mounted NTFS volumes to be exported via NFS.
+	- Add missing return -EOPNOTSUPP; in
+	  fs/ntfs/aops.c::ntfs_commit_nonresident_write().
+	- Enforce no atime and no dir atime updates at mount/remount time as
+	  they are not implemented yet anyway.
+
 2.1.6 - Fix minor bug in handling of compressed directories.
 
 	- Fix bug in handling of compressed directories.  A compressed
@@ -60,6 +77,10 @@ ToDo:
 	- Reduce function local stack usage from 0x3d4 bytes to just noise in
 	  fs/ntfs/upcase.c. (Randy Dunlap <rddunlap@osdl.ord>)
 	- Remove compiler warnings for newer gcc.
+	- Pages are no longer kmapped by mm/filemap.c::generic_file_write()
+	  around calls to ->{prepare,commit}_write.  Adapt NTFS appropriately
+	  in fs/ntfs/aops.c::ntfs_prepare_nonresident_write() by using
+	  kmap_atomic(KM_USER0).
 
 2.1.0 - First steps towards write support: implement file overwrite.
 

fs/ntfs/Makefile

@@ -5,7 +5,7 @@ obj-$(CONFIG_NTFS_FS) += ntfs.o
 ntfs-objs := aops.o attrib.o compress.o debug.o dir.o file.o inode.o mft.o \
 	     mst.o namei.o super.o sysctl.o time.o unistr.o upcase.o
 
-EXTRA_CFLAGS = -DNTFS_VERSION=\"2.1.6\"
+EXTRA_CFLAGS = -DNTFS_VERSION=\"2.1.7\"
 
 ifeq ($(CONFIG_NTFS_DEBUG),y)
 EXTRA_CFLAGS += -DDEBUG

fs/ntfs/aops.c

@@ -2,7 +2,7 @@
  * aops.c - NTFS kernel address space operations and page cache handling.
  *	    Part of the Linux-NTFS project.
  *
- * Copyright (c) 2001-2003 Anton Altaparmakov
+ * Copyright (c) 2001-2004 Anton Altaparmakov
  * Copyright (c) 2002 Richard Russon
  *
  * This program/include file is free software; you can redistribute it and/or
@@ -1536,6 +1536,7 @@ static int ntfs_commit_nonresident_write(struct page *page,
 	if (pos > vi->i_size) {
 		ntfs_error(vi->i_sb, "Writing beyond the existing file size is "
 				"not supported yet. Sorry.");
+		return -EOPNOTSUPP;
 		// vi->i_size = pos;
 		// mark_inode_dirty(vi);
 	}

fs/ntfs/dir.c

 /**
  * dir.c - NTFS kernel directory operations. Part of the Linux-NTFS project.
  *
- * Copyright (c) 2001-2003 Anton Altaparmakov
+ * Copyright (c) 2001-2004 Anton Altaparmakov
  * Copyright (c) 2002 Richard Russon
  *
  * This program/include file is free software; you can redistribute it and/or
@@ -200,7 +200,8 @@ MFT_REF ntfs_lookup_inode_by_name(ntfs_inode *dir_ni, const uchar_t *uname,
 						"and if that doesn't find any "
 						"errors please report you saw "
 						"this message to "
-						"linux-ntfs-dev@lists.sf.net.");
+						"linux-ntfs-dev@lists."
+						"sourceforge.net.");
 				goto dir_err_out;
 			}
 
@@ -457,7 +458,8 @@ MFT_REF ntfs_lookup_inode_by_name(ntfs_inode *dir_ni, const uchar_t *uname,
 						"and if that doesn't find any "
 						"errors please report you saw "
 						"this message to "
-						"linux-ntfs-dev@lists.sf.net.");
+						"linux-ntfs-dev@lists."
+						"sourceforge.net.");
 				ntfs_unmap_page(page);
 				goto dir_err_out;
 			}

fs/ntfs/inode.c

@@ -196,7 +196,7 @@ struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no)
 	}
 	/*
 	 * There is no point in keeping bad inodes around if the failure was
-	 * due to ENOMEM. We want to be able to retry again layer.
+	 * due to ENOMEM. We want to be able to retry again later.
 	 */
 	if (err == -ENOMEM) {
 		iput(vi);
@@ -533,7 +533,7 @@ static int ntfs_read_locked_inode(struct inode *vi)
 	}
 
 	/* Transfer information from mft record into vfs and ntfs inodes. */
-	ni->seq_no = le16_to_cpu(m->sequence_number);
+	vi->i_generation = ni->seq_no = le16_to_cpu(m->sequence_number);
 
 	/*
 	 * FIXME: Keep in mind that link_count is two for files which have both
@@ -1109,7 +1109,7 @@ static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi)
 	vi->i_mtime	= base_vi->i_mtime;
 	vi->i_ctime	= base_vi->i_ctime;
 	vi->i_atime	= base_vi->i_atime;
-	ni->seq_no	= base_ni->seq_no;
+	vi->i_generation = ni->seq_no = base_ni->seq_no;
 
 	/* Set inode type to zero but preserve permissions. */
 	vi->i_mode	= base_vi->i_mode & ~S_IFMT;
@@ -1137,7 +1137,8 @@ static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi)
 					"the attribute is resident (mft_no "
 					"0x%lx, type 0x%x, name_len %i). "
 					"Please report you saw this message "
-					"to linux-ntfs-dev@lists.sf.net",
+					"to linux-ntfs-dev@lists."
+					"sourceforge.net",
 					vi->i_ino, ni->type, ni->name_len);
 			goto unm_err_out;
 		}
@@ -1157,8 +1158,9 @@ static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi)
 						"type 0x%x, name_len %i). "
 						"Please report you saw this "
 						"message to linux-ntfs-dev@"
-						"lists.sf.net", vi->i_ino,
-						ni->type, ni->name_len);
+						"lists.sourceforge.net",
+						vi->i_ino, ni->type,
+						ni->name_len);
 				goto unm_err_out;
 			}
 			NInoSetCompressed(ni);
@@ -1169,7 +1171,8 @@ static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi)
 						"(mft_no 0x%lx, type 0x%x, "
 						"name_len %i). Please report "
 						"you saw this message to "
-						"linux-ntfs-dev@lists.sf.net",
+						"linux-ntfs-dev@lists."
+						"sourceforge.net",
 						vi->i_ino, ni->type,
 						ni->name_len);
 				goto unm_err_out;
@@ -1224,8 +1227,9 @@ static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi)
 						"type 0x%x, name_len %i). "
 						"Please report you saw this "
 						"message to linux-ntfs-dev@"
-						"lists.sf.net", vi->i_ino,
-						ni->type, ni->name_len);
+						"lists.sourceforge.net",
+						vi->i_ino, ni->type,
+						ni->name_len);
 				goto unm_err_out;
 			}
 			NInoSetEncrypted(ni);
@@ -1238,8 +1242,9 @@ static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi)
 						"type 0x%x, name_len %i). "
 						"Please report you saw this "
 						"message to linux-ntfs-dev@"
-						"lists.sf.net", vi->i_ino,
-						ni->type, ni->name_len);
+						"lists.sourceforge.net",
+						vi->i_ino, ni->type,
+						ni->name_len);
 				goto unm_err_out;
 			}
 			NInoSetSparse(ni);
@@ -1414,7 +1419,7 @@ void ntfs_read_inode_mount(struct inode *vi)
 	}
 
 	/* Need this to sanity check attribute list references to $MFT. */
-	ni->seq_no = le16_to_cpu(m->sequence_number);
+	vi->i_generation = ni->seq_no = le16_to_cpu(m->sequence_number);
 
 	/* Provides readpage() and sync_page() for map_mft_record(). */
 	vi->i_mapping->a_ops = &ntfs_mft_aops;
@@ -1541,7 +1546,8 @@ void ntfs_read_inode_mount(struct inode *vi)
 						"of $MFT is not in the base "
 						"mft record. Please report "
 						"you saw this message to "
-						"linux-ntfs-dev@lists.sf.net");
+						"linux-ntfs-dev@lists."
+						"sourceforge.net");
 				goto put_err_out;
 			} else {
 				/* Sequence numbers must match. */
@@ -1662,7 +1668,8 @@ void ntfs_read_inode_mount(struct inode *vi)
 						"Run chkdsk and if no errors "
 						"are found, please report you "
 						"saw this message to "
-						"linux-ntfs-dev@lists.sf.net");
+						"linux-ntfs-dev@lists."
+						"sourceforge.net");
 				put_attr_search_ctx(ctx);
 				/* Revert to the safe super operations. */
 				sb->s_op = &ntfs_mount_sops;

fs/ntfs/layout.h

@@ -2,7 +2,7 @@
  * layout.h - All NTFS associated on-disk structures. Part of the Linux-NTFS
  *	      project.
  *
- * Copyright (c) 2001-2003 Anton Altaparmakov
+ * Copyright (c) 2001-2004 Anton Altaparmakov
  * Copyright (c) 2002 Richard Russon
  *
  * This program/include file is free software; you can redistribute it and/or
@@ -941,7 +941,7 @@ typedef struct {
 					   modified. */
 /* 18*/	s64 last_mft_change_time;	/* Time this mft record was last
 					   modified. */
-/* 20*/	s64 last_access_time;		/* Last time this mft record was
+/* 20*/	s64 last_access_time;		/* Time this mft record was last
 					   accessed. */
 /* 28*/	s64 allocated_size;		/* Byte size of allocated space for the
 					   data attribute. NOTE: Is a multiple

fs/ntfs/super.c

 /*
  * super.c - NTFS kernel super block handling. Part of the Linux-NTFS project.
  *
- * Copyright (c) 2001-2003 Anton Altaparmakov
+ * Copyright (c) 2001-2004 Anton Altaparmakov
  * Copyright (c) 2001,2002 Richard Russon
  *
  * This program/include file is free software; you can redistribute it and/or
@@ -323,6 +323,9 @@ static int ntfs_remount(struct super_block *sb, int *flags, char *opt)
 			return -EROFS;
 		}
 	}
+	// TODO:  For now we enforce no atime and dir atime updates as they are
+	// not implemented.
+	*flags |= MS_NOATIME | MS_NODIRATIME;
 #endif
 
 	// FIXME/TODO: If left like this we will have problems with rw->ro and
@@ -1338,6 +1341,40 @@ struct super_operations ntfs_sops = {
 	.show_options	= ntfs_show_options, /* Show mount options in proc. */
 };
 
+
+/**
+ * Declarations for NTFS specific export operations (fs/ntfs/namei.c).
+ */
+extern struct dentry *ntfs_get_parent(struct dentry *child_dent);
+extern struct dentry *ntfs_get_dentry(struct super_block *sb, void *fh);
+
+/**
+ * Export operations allowing NFS exporting of mounted NTFS partitions.
+ *
+ * We use the default ->decode_fh() and ->encode_fh() for now.  Note that they
+ * use 32 bits to store the inode number which is an unsigned long so on 64-bit
+ * architectures is usually 64 bits so it would all fail horribly on huge
+ * volumes.  I guess we need to define our own encode and decode fh functions
+ * that store 64-bit inode numbers at some point but for now we will ignore the
+ * problem...
+ *
+ * We also use the default ->get_name() helper (used by ->decode_fh() via
+ * fs/exportfs/expfs.c::find_exported_dentry()) as that is completely fs
+ * independent.
+ *
+ * The default ->get_parent() just returns -EACCES so we have to provide our
+ * own and the default ->get_dentry() is incompatible with NTFS due to not
+ * allowing the inode number 0 which is used in NTFS for the system file $MFT
+ * and due to using iget() whereas NTFS needs ntfs_iget().
+ */
+static struct export_operations ntfs_export_ops = {
+	.get_parent	= ntfs_get_parent,	/* Find the parent of a given
+						   directory. */
+	.get_dentry	= ntfs_get_dentry,	/* Find a dentry for the inode
+						   given a file handle
+						   sub-fragment. */
+};
+
 /**
  * ntfs_fill_super - mount an ntfs files system
  * @sb:		super block of ntfs file system to mount
@@ -1366,6 +1403,10 @@ static int ntfs_fill_super(struct super_block *sb, void *opt, const int silent)
 	ntfs_debug("Entering.");
 #ifndef NTFS_RW
 	sb->s_flags |= MS_RDONLY | MS_NOATIME | MS_NODIRATIME;
+#else
+	// TODO:  For now we enforce no atime and dir atime updates as they are
+	// not implemented.
+	sb->s_flags |= MS_NOATIME | MS_NODIRATIME;
 #endif
 	/* Allocate a new ntfs_volume and place it in sb->s_fs_info. */
 	sb->s_fs_info = kmalloc(sizeof(ntfs_volume), GFP_NOFS);
@@ -1544,6 +1585,7 @@ static int ntfs_fill_super(struct super_block *sb, void *opt, const int silent)
 			default_upcase = NULL;
 		}
 		up(&ntfs_lock);
+		sb->s_export_op = &ntfs_export_ops;
 		return 0;
 	}
 	ntfs_error(sb, "Failed to allocate root directory.");
@@ -1788,13 +1830,13 @@ static void __exit exit_ntfs_fs(void)
 		printk(KERN_CRIT "NTFS: This causes memory to leak! There is "
 				"probably a BUG in the driver! Please report "
 				"you saw this message to "
-				"linux-ntfs-dev@lists.sf.net\n");
+				"linux-ntfs-dev@lists.sourceforge.net\n");
 	/* Unregister the ntfs sysctls. */
 	ntfs_sysctl(0);
 }
 
 MODULE_AUTHOR("Anton Altaparmakov <aia21@cantab.net>");
-MODULE_DESCRIPTION("NTFS 1.2/3.x driver - Copyright (c) 2001-2003 Anton Altaparmakov");
+MODULE_DESCRIPTION("NTFS 1.2/3.x driver - Copyright (c) 2001-2004 Anton Altaparmakov");
 MODULE_LICENSE("GPL");
 #ifdef DEBUG
 MODULE_PARM(debug_msgs, "i");

fs/ntfs/unistr.c

 /*
  * unistr.c - NTFS Unicode string handling. Part of the Linux-NTFS project.
  *
- * Copyright (c) 2001-2003 Anton Altaparmakov
+ * Copyright (c) 2001-2004 Anton Altaparmakov
  *
  * This program/include file is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as published
@@ -305,8 +305,9 @@ int ntfs_nlstoucs(const ntfs_volume *vol, const char *ins,
  * Convert the input little endian, 2-byte Unicode string @ins, of length
  * @ins_len into the string format dictated by the loaded NLS.
  *
- * If @outs is NULL, this function allocates the string and the caller is
- * responsible for calling kfree(@outs); when finished with it.
+ * If *@outs is NULL, this function allocates the string and the caller is
+ * responsible for calling kfree(*@outs); when finished with it. In this case
+ * @outs_len is ignored and can be 0.
  *
  * On success the function returns the number of bytes written to the output
  * string *@outs (>= 0), not counting the terminating NULL byte. If the output