NTFS: - Add disable_sparse mount option together with a per volume sparse

enable bit which is set appropriately and a per inode sparse disable
	bit which is preset on some system file inodes as appropriate.
      - Enforce that sparse support is disabled on NTFS volumes pre 3.0.

Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

Documentation/filesystems/ntfs.txt

@@ -149,6 +149,13 @@ case_sensitive=<BOOL>	If case_sensitive is specified, treat all file names as
 			name, if it exists.  If case_sensitive, you will need
 			to provide the correct case of the short file name.
 
+disable_sparse=<BOOL>	If disable_sparse is specified, creation of sparse
+			regions, i.e. holes, inside files is disabled for the
+			volume (for the duration of this mount only).  By
+			default, creation of sparse regions is enabled, which
+			is consistent with the behaviour of traditional Unix
+			filesystems.
+
 errors=opt		What to do when critical filesystem errors are found.
 			Following values can be used for "opt":
 			  continue: DEFAULT, try to clean-up as much as

fs/ntfs/ChangeLog

@@ -56,6 +56,10 @@ ToDo/Notes:
 	  this only works until the data attribute becomes too big for the mft
 	  record after which we abort the write returning -EOPNOTSUPP from
 	  ntfs_prepare_write().
+	- Add disable_sparse mount option together with a per volume sparse
+	  enable bit which is set appropriately and a per inode sparse disable
+	  bit which is preset on some system file inodes as appropriate.
+	- Enforce that sparse support is disabled on NTFS volumes pre 3.0.
 
 2.1.22 - Many bug and race fixes and error handling improvements.
 

fs/ntfs/dir.c

@@ -1,7 +1,7 @@
 /**
  * dir.c - NTFS kernel directory operations. Part of the Linux-NTFS project.
  *
- * Copyright (c) 2001-2004 Anton Altaparmakov
+ * Copyright (c) 2001-2005 Anton Altaparmakov
  * Copyright (c) 2002 Richard Russon
  *
  * This program/include file is free software; you can redistribute it and/or

fs/ntfs/inode.c

@@ -1,7 +1,7 @@
 /**
  * inode.c - NTFS kernel inode handling. Part of the Linux-NTFS project.
  *
- * Copyright (c) 2001-2004 Anton Altaparmakov
+ * Copyright (c) 2001-2005 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
@@ -1731,6 +1731,7 @@ int ntfs_read_inode_mount(struct inode *vi)
 	/* Setup the data attribute. It is special as it is mst protected. */
 	NInoSetNonResident(ni);
 	NInoSetMstProtected(ni);
+	NInoSetSparseDisabled(ni);
 	ni->type = AT_DATA;
 	ni->name = NULL;
 	ni->name_len = 0;
@@ -2279,6 +2280,8 @@ int ntfs_show_options(struct seq_file *sf, struct vfsmount *mnt)
 		seq_printf(sf, ",case_sensitive");
 	if (NVolShowSystemFiles(vol))
 		seq_printf(sf, ",show_sys_files");
+	if (!NVolSparseEnabled(vol))
+		seq_printf(sf, ",disable_sparse");
 	for (i = 0; on_errors_arr[i].val; i++) {
 		if (on_errors_arr[i].val & vol->on_errors)
 			seq_printf(sf, ",errors=%s", on_errors_arr[i].str);

fs/ntfs/inode.h

@@ -2,7 +2,7 @@
  * inode.h - Defines for inode structures NTFS Linux kernel driver. Part of
  *	     the Linux-NTFS project.
  *
- * Copyright (c) 2001-2004 Anton Altaparmakov
+ * Copyright (c) 2001-2005 Anton Altaparmakov
  * Copyright (c) 2002 Richard Russon
  *
  * This program/include file is free software; you can redistribute it and/or
@@ -166,6 +166,7 @@ typedef enum {
 	NI_Sparse,		/* 1: Unnamed data attr is sparse (f).
 				   1: Create sparse files by default (d).
 				   1: Attribute is sparse (a). */
+	NI_SparseDisabled,	/* 1: May not create sparse regions. */
 	NI_TruncateFailed,	/* 1: Last ntfs_truncate() call failed. */
 } ntfs_inode_state_bits;
 
@@ -218,6 +219,7 @@ NINO_FNS(IndexAllocPresent)
 NINO_FNS(Compressed)
 NINO_FNS(Encrypted)
 NINO_FNS(Sparse)
+NINO_FNS(SparseDisabled)
 NINO_FNS(TruncateFailed)
 
 /*

fs/ntfs/layout.h

@@ -2,7 +2,7 @@
  * layout.h - All NTFS associated on-disk structures. Part of the Linux-NTFS
  *	      project.
  *
- * Copyright (c) 2001-2004 Anton Altaparmakov
+ * Copyright (c) 2001-2005 Anton Altaparmakov
  * Copyright (c) 2002 Richard Russon
  *
  * This program/include file is free software; you can redistribute it and/or

fs/ntfs/super.c

@@ -1,7 +1,7 @@
 /*
  * super.c - NTFS kernel super block handling. Part of the Linux-NTFS project.
  *
- * Copyright (c) 2001-2004 Anton Altaparmakov
+ * Copyright (c) 2001-2005 Anton Altaparmakov
  * Copyright (c) 2001,2002 Richard Russon
  *
  * This program/include file is free software; you can redistribute it and/or
@@ -102,7 +102,7 @@ static BOOL parse_options(ntfs_volume *vol, char *opt)
 	gid_t gid = (gid_t)-1;
 	mode_t fmask = (mode_t)-1, dmask = (mode_t)-1;
 	int mft_zone_multiplier = -1, on_errors = -1;
-	int show_sys_files = -1, case_sensitive = -1;
+	int show_sys_files = -1, case_sensitive = -1, disable_sparse = -1;
 	struct nls_table *nls_map = NULL, *old_nls;
 
 	/* I am lazy... (-8 */
@@ -162,6 +162,7 @@ static BOOL parse_options(ntfs_volume *vol, char *opt)
 		else NTFS_GETOPT_WITH_DEFAULT("sloppy", sloppy, TRUE)
 		else NTFS_GETOPT_BOOL("show_sys_files", show_sys_files)
 		else NTFS_GETOPT_BOOL("case_sensitive", case_sensitive)
+		else NTFS_GETOPT_BOOL("disable_sparse", disable_sparse)
 		else NTFS_GETOPT_OPTIONS_ARRAY("errors", on_errors,
 				on_errors_arr)
 		else if (!strcmp(p, "posix") || !strcmp(p, "show_inodes"))
@@ -291,6 +292,21 @@ no_mount_options:
 		else
 			NVolClearCaseSensitive(vol);
 	}
+	if (disable_sparse != -1) {
+		if (disable_sparse)
+			NVolClearSparseEnabled(vol);
+		else {
+			if (!NVolSparseEnabled(vol) &&
+					vol->major_ver && vol->major_ver < 3)
+				ntfs_warning(vol->sb, "Not enabling sparse "
+						"support due to NTFS volume "
+						"version %i.%i (need at least "
+						"version 3.0).", vol->major_ver,
+						vol->minor_ver);
+			else
+				NVolSetSparseEnabled(vol);
+		}
+	}
 	return TRUE;
 needs_arg:
 	ntfs_error(vol->sb, "The %s option requires an argument.", p);
@@ -967,6 +983,7 @@ static BOOL load_and_init_mft_mirror(ntfs_volume *vol)
 	tmp_ni = NTFS_I(tmp_ino);
 	/* The $MFTMirr, like the $MFT is multi sector transfer protected. */
 	NInoSetMstProtected(tmp_ni);
+	NInoSetSparseDisabled(tmp_ni);
 	/*
 	 * Set up our little cheat allowing us to reuse the async read io
 	 * completion handler for directories.
@@ -1122,6 +1139,7 @@ static BOOL load_and_check_logfile(ntfs_volume *vol)
 		/* ntfs_check_logfile() will have displayed error output. */
 		return FALSE;
 	}
+	NInoSetSparseDisabled(NTFS_I(tmp_ino));
 	vol->logfile_ino = tmp_ino;
 	ntfs_debug("Done.");
 	return TRUE;
@@ -1220,6 +1238,7 @@ static BOOL load_and_init_attrdef(ntfs_volume *vol)
 			iput(ino);
 		goto failed;
 	}
+	NInoSetSparseDisabled(NTFS_I(ino));
 	/* The size of FILE_AttrDef must be above 0 and fit inside 31 bits. */
 	i_size = i_size_read(ino);
 	if (i_size <= 0 || i_size > 0x7fffffff)
@@ -1439,6 +1458,7 @@ static BOOL load_system_files(ntfs_volume *vol)
 			iput(vol->lcnbmp_ino);
 		goto bitmap_failed;
 	}
+	NInoSetSparseDisabled(NTFS_I(vol->lcnbmp_ino));
 	if ((vol->nr_clusters + 7) >> 3 > i_size_read(vol->lcnbmp_ino)) {
 		iput(vol->lcnbmp_ino);
 bitmap_failed:
@@ -1490,6 +1510,12 @@ get_ctx_vol_failed:
 	unmap_mft_record(NTFS_I(vol->vol_ino));
 	printk(KERN_INFO "NTFS volume version %i.%i.\n", vol->major_ver,
 			vol->minor_ver);
+	if (vol->major_ver < 3 && NVolSparseEnabled(vol)) {
+		ntfs_warning(vol->sb, "Disabling sparse support due to NTFS "
+				"volume version %i.%i (need at least version "
+				"3.0).", vol->major_ver, vol->minor_ver);
+		NVolClearSparseEnabled(vol);
+	}
 #ifdef NTFS_RW
 	/* Make sure that no unsupported volume flags are set. */
 	if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) {
@@ -2259,7 +2285,7 @@ static struct export_operations ntfs_export_ops = {
 };
 
 /**
- * ntfs_fill_super - mount an ntfs files system
+ * ntfs_fill_super - mount an ntfs filesystem
  * @sb:		super block of ntfs filesystem to mount
  * @opt:	string containing the mount options
  * @silent:	silence error output
@@ -2330,6 +2356,9 @@ static int ntfs_fill_super(struct super_block *sb, void *opt, const int silent)
 
 	unlock_kernel();
 
+	/* By default, enable sparse support. */
+	NVolSetSparseEnabled(vol);
+
 	/* Important to get the mount options dealt with now. */
 	if (!parse_options(vol, (char*)opt))
 		goto err_out_now;
@@ -2765,7 +2794,7 @@ static void __exit exit_ntfs_fs(void)
 }
 
 MODULE_AUTHOR("Anton Altaparmakov <aia21@cantab.net>");
-MODULE_DESCRIPTION("NTFS 1.2/3.x driver - Copyright (c) 2001-2004 Anton Altaparmakov");
+MODULE_DESCRIPTION("NTFS 1.2/3.x driver - Copyright (c) 2001-2005 Anton Altaparmakov");
 MODULE_VERSION(NTFS_VERSION);
 MODULE_LICENSE("GPL");
 #ifdef DEBUG

fs/ntfs/sysctl.c

@@ -3,7 +3,7 @@
  *	      the Linux-NTFS project. Adapted from the old NTFS driver,
  *	      Copyright (C) 1997 Martin von Löwis, Régis Duchesne
  *
- * Copyright (c) 2002-2004 Anton Altaparmakov
+ * Copyright (c) 2002-2005 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

fs/ntfs/volume.h

@@ -2,7 +2,7 @@
  * volume.h - Defines for volume structures in NTFS Linux kernel driver. Part
  *	      of the Linux-NTFS project.
  *
- * Copyright (c) 2001-2004 Anton Altaparmakov
+ * Copyright (c) 2001-2005 Anton Altaparmakov
  * Copyright (c) 2002 Richard Russon
  *
  * This program/include file is free software; you can redistribute it and/or
@@ -141,6 +141,7 @@ typedef enum {
 				      file names in WIN32 namespace. */
 	NV_LogFileEmpty,	/* 1: $LogFile journal is empty. */
 	NV_QuotaOutOfDate,	/* 1: $Quota is out of date. */
+	NV_SparseEnabled,	/* 1: May create sparse files. */
 } ntfs_volume_flags;
 
 /*
@@ -167,5 +168,6 @@ NVOL_FNS(ShowSystemFiles)
 NVOL_FNS(CaseSensitive)
 NVOL_FNS(LogFileEmpty)
 NVOL_FNS(QuotaOutOfDate)
+NVOL_FNS(SparseEnabled)
 
 #endif /* _LINUX_NTFS_VOLUME_H */