Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

14 files changed, 3255 insertions, 0 deletions

diff --git a/fs/sysv/CHANGES b/fs/sysv/CHANGES
new file mode 100644
index 00000000000..66ea6e92be6
--- /dev/null
+++ b/fs/sysv/CHANGES
@@ -0,0 +1,60 @@
+Mon, 15 Dec 1997	  Krzysztof G. Baranowski <kgb@manjak.knm.org.pl>
+	*    namei.c: struct sysv_dir_inode_operations updated to use dentries.
+
+Fri, 23 Jan 1998   Krzysztof G. Baranowski <kgb@manjak.knm.org.pl>
+	*    inode.c: corrected 1 track offset setting (in sb->sv_block_base).
+		      Originally it was overridden (by setting to zero)
+		      in detected_[xenix,sysv4,sysv2,coherent]. Thanks
+		      to Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
+		      for identifying the problem.
+
+Tue, 27 Jan 1998   Krzysztof G. Baranowski <kgb@manjak.knm.org.pl>
+        *    inode.c: added 2048-byte block support to SystemV FS.
+		      Merged detected_bs[512,1024,2048]() into one function:
+		      void detected_bs (u_char type, struct super_block *sb).
+		      Thanks to Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
+		      for the patch.
+
+Wed, 4 Feb 1998   Krzysztof G. Baranowski <kgb@manjak.knm.org.pl>
+	*    namei.c: removed static subdir(); is_subdir() from dcache.c
+		      is used instead. Cosmetic changes.
+
+Thu, 3 Dec 1998   Al Viro (viro@parcelfarce.linux.theplanet.co.uk)
+	*    namei.c (sysv_rmdir):
+		      Bugectomy: old check for victim being busy
+		      (inode->i_count) wasn't replaced (with checking
+		      dentry->d_count) and escaped Linus in the last round
+		      of changes. Shot and buried.
+
+Wed, 9 Dec 1998   AV
+	*    namei.c (do_sysv_rename):
+		       Fixed incorrect check for other owners + race.
+		       Removed checks that went to VFS.
+	*    namei.c (sysv_unlink):
+		       Removed checks that went to VFS.
+
+Thu, 10 Dec 1998   AV
+	*    namei.c (do_mknod):
+			Removed dead code - mknod is never asked to
+			create a symlink or directory. Incidentially,
+			it wouldn't do it right if it would be called.
+
+Sat, 26 Dec 1998   KGB
+	*    inode.c (detect_sysv4):
+			Added detection of expanded s_type field (0x10,
+			0x20 and 0x30).  Forced read-only access in this case.
+
+Sun, 21 Mar 1999   AV
+	*    namei.c (sysv_link):
+			Fixed i_count usage that resulted in dcache corruption.
+	*    inode.c:
+			Filled ->delete_inode() method with sysv_delete_inode().
+			sysv_put_inode() is gone, as it tried to do ->delete_
+			_inode()'s job.
+	*    ialloc.c: (sysv_free_inode):
+			Fixed race.
+
+Sun, 30 Apr 1999   AV
+	*    namei.c (sysv_mknod):
+			Removed dead code (S_IFREG case is now passed to
+			->create() by VFS).
diff --git a/fs/sysv/ChangeLog b/fs/sysv/ChangeLog
new file mode 100644
index 00000000000..18e3487debd
--- /dev/null
+++ b/fs/sysv/ChangeLog
@@ -0,0 +1,106 @@
+Thu Feb 14 2002  Andrew Morton  <akpm@zip.com.au>
+
+	* dir_commit_chunk(): call writeout_one_page() as well as
+	  waitfor_one_page() for IS_SYNC directories, so that we
+	  actually do sync the directory. (forward-port from 2.4).
+
+Thu Feb  7 2002  Alexander Viro  <viro@parcelfarce.linux.theplanet.co.uk>
+
+	* super.c: switched to ->get_sb()
+	* ChangeLog: fixed dates ;-)
+
+2002-01-24  David S. Miller  <davem@redhat.com>
+
+	* inode.c: Include linux/init.h
+
+Mon Jan 21 2002  Alexander Viro  <viro@parcelfarce.linux.theplanet.co.uk>
+	* ialloc.c (sysv_new_inode): zero SYSV_I(inode)->i_data out.
+	* i_vnode renamed to vfs_inode.  Sorry, but let's keep that
+	  consistent.
+
+Sat Jan 19 2002  Christoph Hellwig  <hch@infradead.org>
+
+	* include/linux/sysv_fs.h (SYSV_I): Get fs-private inode data using
+		list_entry() instead of inode->u.
+	* include/linux/sysv_fs_i.h: Add 'struct inode  i_vnode' field to
+		sysv_inode_info structure.
+	* inode.c: Include <linux/slab.h>, implement alloc_inode/destroy_inode
+		sop methods, add infrastructure for per-fs inode slab cache.
+	* super.c (init_sysv_fs): Initialize inode cache, recover properly
+		in the case of failed register_filesystem for V7.
+	(exit_sysv_fs): Destroy inode cache.
+
+Sat Jan 19 2002  Christoph Hellwig  <hch@infradead.org>
+
+	* include/linux/sysv_fs.h: Include <linux/sysv_fs_i.h>, declare SYSV_I().
+	* dir.c (sysv_find_entry): Use SYSV_I() instead of ->u.sysv_i to
+		access fs-private inode data.
+	* ialloc.c (sysv_new_inode): Likewise.
+	* inode.c (sysv_read_inode): Likewise.
+	(sysv_update_inode): Likewise.
+	* itree.c (get_branch): Likewise.
+	(sysv_truncate): Likewise.
+	* symlink.c (sysv_readlink): Likewise.
+	(sysv_follow_link): Likewise.
+
+Fri Jan  4 2002  Alexander Viro  <viro@parcelfarce.linux.theplanet.co.uk>
+
+	* ialloc.c (sysv_free_inode): Use sb->s_id instead of bdevname().
+	* inode.c (sysv_read_inode): Likewise.
+	  (sysv_update_inode): Likewise.
+	  (sysv_sync_inode): Likewise.
+	* super.c (detect_sysv): Likewise.
+	  (complete_read_super): Likewise.
+	  (sysv_read_super): Likewise.
+	  (v7_read_super): Likewise.
+
+Sun Dec 30 2001  Manfred Spraul  <manfreds@colorfullife.com>
+
+	* dir.c (dir_commit_chunk): Do not set dir->i_version.
+	(sysv_readdir): Likewise.
+
+Thu Dec 27 2001  Alexander Viro  <viro@parcelfarce.linux.theplanet.co.uk>
+
+	* itree.c (get_block): Use map_bh() to fill out bh_result.
+
+Tue Dec 25 2001  Alexander Viro  <viro@parcelfarce.linux.theplanet.co.uk>
+
+	* super.c (sysv_read_super): Use sb_set_blocksize() to set blocksize.
+	  (v7_read_super): Likewise.
+
+Tue Nov 27 2001  Alexander Viro  <viro@parcelfarce.linux.theplanet.co.uk>
+
+	* itree.c (get_block): Change type for iblock argument to sector_t.
+	* super.c (sysv_read_super): Set s_blocksize early.
+	  (v7_read_super): Likewise.
+	* balloc.c (sysv_new_block): Use sb_bread(). instead of bread().
+	  (sysv_count_free_blocks): Likewise.
+	* ialloc.c (sysv_raw_inode): Likewise.
+	* itree.c (get_branch): Likewise.
+	  (free_branches): Likewise.
+	* super.c (sysv_read_super): Likewise.
+	  (v7_read_super): Likewise.
+
+Sat Dec 15 2001  Christoph Hellwig  <hch@infradead.org>
+
+	* inode.c (sysv_read_inode): Mark inode as bad in case of failure.
+	* super.c (complete_read_super): Check for bad root inode.
+
+Wed Nov 21 2001  Andrew Morton  <andrewm@uow.edu.au>
+
+	* file.c (sysv_sync_file): Call fsync_inode_data_buffers.
+
+Fri Oct 26 2001  Christoph Hellwig  <hch@infradead.org>
+
+	* dir.c, ialloc.c, namei.c, include/linux/sysv_fs_i.h:
+	Implement per-Inode lookup offset cache.
+	Modelled after Ted's ext2 patch.
+
+Fri Oct 26 2001  Christoph Hellwig  <hch@infradead.org>
+
+	* inode.c, super.c, include/linux/sysv_fs.h,
+	  include/linux/sysv_fs_sb.h:
+	Remove symlink faking.	Noone really wants to use these as
+	linux filesystems and native OSes don't support it anyway.
+
+
diff --git a/fs/sysv/INTRO b/fs/sysv/INTRO
new file mode 100644
index 00000000000..de4e4d17cac
--- /dev/null
+++ b/fs/sysv/INTRO
@@ -0,0 +1,182 @@
+This is the implementation of the SystemV/Coherent filesystem for Linux.
+It grew out of separate filesystem implementations
+
+    Xenix FS      Doug Evans <dje@cygnus.com>  June 1992
+    SystemV FS    Paul B. Monday <pmonday@eecs.wsu.edu> March-June 1993
+    Coherent FS   B. Haible <haible@ma2s2.mathematik.uni-karlsruhe.de> June 1993
+
+and was merged together in July 1993.
+
+These filesystems are rather similar. Here is a comparison with Minix FS:
+
+* Linux fdisk reports on partitions
+  - Minix FS     0x81 Linux/Minix
+  - Xenix FS     ??
+  - SystemV FS   ??
+  - Coherent FS  0x08 AIX bootable
+
+* Size of a block or zone (data allocation unit on disk)
+  - Minix FS     1024
+  - Xenix FS     1024 (also 512 ??)
+  - SystemV FS   1024 (also 512 and 2048)
+  - Coherent FS   512
+
+* General layout: all have one boot block, one super block and
+  separate areas for inodes and for directories/data.
+  On SystemV Release 2 FS (e.g. Microport) the first track is reserved and
+  all the block numbers (including the super block) are offset by one track.
+
+* Byte ordering of "short" (16 bit entities) on disk:
+  - Minix FS     little endian  0 1
+  - Xenix FS     little endian  0 1
+  - SystemV FS   little endian  0 1
+  - Coherent FS  little endian  0 1
+  Of course, this affects only the file system, not the data of files on it!
+
+* Byte ordering of "long" (32 bit entities) on disk:
+  - Minix FS     little endian  0 1 2 3
+  - Xenix FS     little endian  0 1 2 3
+  - SystemV FS   little endian  0 1 2 3
+  - Coherent FS  PDP-11         2 3 0 1
+  Of course, this affects only the file system, not the data of files on it!
+
+* Inode on disk: "short", 0 means non-existent, the root dir ino is:
+  - Minix FS                            1
+  - Xenix FS, SystemV FS, Coherent FS   2
+
+* Maximum number of hard links to a file:
+  - Minix FS     250
+  - Xenix FS     ??
+  - SystemV FS   ??
+  - Coherent FS  >=10000
+
+* Free inode management:
+  - Minix FS                             a bitmap
+  - Xenix FS, SystemV FS, Coherent FS
+      There is a cache of a certain number of free inodes in the super-block.
+      When it is exhausted, new free inodes are found using a linear search.
+
+* Free block management:
+  - Minix FS                             a bitmap
+  - Xenix FS, SystemV FS, Coherent FS
+      Free blocks are organized in a "free list". Maybe a misleading term,
+      since it is not true that every free block contains a pointer to
+      the next free block. Rather, the free blocks are organized in chunks
+      of limited size, and every now and then a free block contains pointers
+      to the free blocks pertaining to the next chunk; the first of these
+      contains pointers and so on. The list terminates with a "block number"
+      0 on Xenix FS and SystemV FS, with a block zeroed out on Coherent FS.
+
+* Super-block location:
+  - Minix FS     block 1 = bytes 1024..2047
+  - Xenix FS     block 1 = bytes 1024..2047
+  - SystemV FS   bytes 512..1023
+  - Coherent FS  block 1 = bytes 512..1023
+
+* Super-block layout:
+  - Minix FS
+                    unsigned short s_ninodes;
+                    unsigned short s_nzones;
+                    unsigned short s_imap_blocks;
+                    unsigned short s_zmap_blocks;
+                    unsigned short s_firstdatazone;
+                    unsigned short s_log_zone_size;
+                    unsigned long s_max_size;
+                    unsigned short s_magic;
+  - Xenix FS, SystemV FS, Coherent FS
+                    unsigned short s_firstdatazone;
+                    unsigned long  s_nzones;
+                    unsigned short s_fzone_count;
+                    unsigned long  s_fzones[NICFREE];
+                    unsigned short s_finode_count;
+                    unsigned short s_finodes[NICINOD];
+                    char           s_flock;
+                    char           s_ilock;
+                    char           s_modified;
+                    char           s_rdonly;
+                    unsigned long  s_time;
+                    short          s_dinfo[4]; -- SystemV FS only
+                    unsigned long  s_free_zones;
+                    unsigned short s_free_inodes;
+                    short          s_dinfo[4]; -- Xenix FS only
+                    unsigned short s_interleave_m,s_interleave_n; -- Coherent FS only
+                    char           s_fname[6];
+                    char           s_fpack[6];
+    then they differ considerably:
+        Xenix FS
+                    char           s_clean;
+                    char           s_fill[371];
+                    long           s_magic;
+                    long           s_type;
+        SystemV FS
+                    long           s_fill[12 or 14];
+                    long           s_state;
+                    long           s_magic;
+                    long           s_type;
+        Coherent FS
+                    unsigned long  s_unique;
+    Note that Coherent FS has no magic.
+
+* Inode layout:
+  - Minix FS
+                    unsigned short i_mode;
+                    unsigned short i_uid;
+                    unsigned long  i_size;
+                    unsigned long  i_time;
+                    unsigned char  i_gid;
+                    unsigned char  i_nlinks;
+                    unsigned short i_zone[7+1+1];
+  - Xenix FS, SystemV FS, Coherent FS
+                    unsigned short i_mode;
+                    unsigned short i_nlink;
+                    unsigned short i_uid;
+                    unsigned short i_gid;
+                    unsigned long  i_size;
+                    unsigned char  i_zone[3*(10+1+1+1)];
+                    unsigned long  i_atime;
+                    unsigned long  i_mtime;
+                    unsigned long  i_ctime;
+
+* Regular file data blocks are organized as
+  - Minix FS
+               7 direct blocks
+               1 indirect block (pointers to blocks)
+               1 double-indirect block (pointer to pointers to blocks)
+  - Xenix FS, SystemV FS, Coherent FS
+              10 direct blocks
+               1 indirect block (pointers to blocks)
+               1 double-indirect block (pointer to pointers to blocks)
+               1 triple-indirect block (pointer to pointers to pointers to blocks)
+
+* Inode size, inodes per block
+  - Minix FS        32   32
+  - Xenix FS        64   16
+  - SystemV FS      64   16
+  - Coherent FS     64    8
+
+* Directory entry on disk
+  - Minix FS
+                    unsigned short inode;
+                    char name[14/30];
+  - Xenix FS, SystemV FS, Coherent FS
+                    unsigned short inode;
+                    char name[14];
+
+* Dir entry size, dir entries per block
+  - Minix FS     16/32    64/32
+  - Xenix FS     16       64
+  - SystemV FS   16       64
+  - Coherent FS  16       32
+
+* How to implement symbolic links such that the host fsck doesn't scream:
+  - Minix FS     normal
+  - Xenix FS     kludge: as regular files with  chmod 1000
+  - SystemV FS   ??
+  - Coherent FS  kludge: as regular files with  chmod 1000
+
+
+Notation: We often speak of a "block" but mean a zone (the allocation unit)
+and not the disk driver's notion of "block".
+
+
+Bruno Haible  <haible@ma2s2.mathematik.uni-karlsruhe.de>
diff --git a/fs/sysv/Makefile b/fs/sysv/Makefile
new file mode 100644
index 00000000000..3591f9d7a48
--- /dev/null
+++ b/fs/sysv/Makefile
@@ -0,0 +1,8 @@
+#
+# Makefile for the Linux SystemV/Coherent filesystem routines.
+#
+
+obj-$(CONFIG_SYSV_FS) += sysv.o
+
+sysv-objs := ialloc.o balloc.o inode.o itree.o file.o dir.o \
+	     namei.o super.o symlink.o
diff --git a/fs/sysv/balloc.c b/fs/sysv/balloc.c
new file mode 100644
index 00000000000..9a6ad96acf2
--- /dev/null
+++ b/fs/sysv/balloc.c
@@ -0,0 +1,239 @@
+/*
+ *  linux/fs/sysv/balloc.c
+ *
+ *  minix/bitmap.c
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *  ext/freelists.c
+ *  Copyright (C) 1992  Remy Card (card@masi.ibp.fr)
+ *
+ *  xenix/alloc.c
+ *  Copyright (C) 1992  Doug Evans
+ *
+ *  coh/alloc.c
+ *  Copyright (C) 1993  Pascal Haible, Bruno Haible
+ *
+ *  sysv/balloc.c
+ *  Copyright (C) 1993  Bruno Haible
+ *
+ *  This file contains code for allocating/freeing blocks.
+ */
+
+#include <linux/buffer_head.h>
+#include <linux/string.h>
+#include "sysv.h"
+
+/* We don't trust the value of
+   sb->sv_sbd2->s_tfree = *sb->sv_free_blocks
+   but we nevertheless keep it up to date. */
+
+static inline sysv_zone_t *get_chunk(struct super_block *sb, struct buffer_head *bh)
+{
+	char *bh_data = bh->b_data;
+
+	if (SYSV_SB(sb)->s_type == FSTYPE_SYSV4)
+		return (sysv_zone_t*)(bh_data+4);
+	else
+		return (sysv_zone_t*)(bh_data+2);
+}
+
+/* NOTE NOTE NOTE: nr is a block number _as_ _stored_ _on_ _disk_ */
+
+void sysv_free_block(struct super_block * sb, sysv_zone_t nr)
+{
+	struct sysv_sb_info * sbi = SYSV_SB(sb);
+	struct buffer_head * bh;
+	sysv_zone_t *blocks = sbi->s_bcache;
+	unsigned count;
+	unsigned block = fs32_to_cpu(sbi, nr);
+
+	/*
+	 * This code does not work at all for AFS (it has a bitmap
+	 * free list).  As AFS is supposed to be read-only no one
+	 * should call this for an AFS filesystem anyway...
+	 */
+	if (sbi->s_type == FSTYPE_AFS)
+		return;
+
+	if (block < sbi->s_firstdatazone || block >= sbi->s_nzones) {
+		printk("sysv_free_block: trying to free block not in datazone\n");
+		return;
+	}
+
+	lock_super(sb);
+	count = fs16_to_cpu(sbi, *sbi->s_bcache_count);
+
+	if (count > sbi->s_flc_size) {
+		printk("sysv_free_block: flc_count > flc_size\n");
+		unlock_super(sb);
+		return;
+	}
+	/* If the free list head in super-block is full, it is copied
+	 * into this block being freed, ditto if it's completely empty
+	 * (applies only on Coherent).
+	 */
+	if (count == sbi->s_flc_size || count == 0) {
+		block += sbi->s_block_base;
+		bh = sb_getblk(sb, block);
+		if (!bh) {
+			printk("sysv_free_block: getblk() failed\n");
+			unlock_super(sb);
+			return;
+		}
+		memset(bh->b_data, 0, sb->s_blocksize);
+		*(__fs16*)bh->b_data = cpu_to_fs16(sbi, count);
+		memcpy(get_chunk(sb,bh), blocks, count * sizeof(sysv_zone_t));
+		mark_buffer_dirty(bh);
+		set_buffer_uptodate(bh);
+		brelse(bh);
+		count = 0;
+	}
+	sbi->s_bcache[count++] = nr;
+
+	*sbi->s_bcache_count = cpu_to_fs16(sbi, count);
+	fs32_add(sbi, sbi->s_free_blocks, 1);
+	dirty_sb(sb);
+	unlock_super(sb);
+}
+
+sysv_zone_t sysv_new_block(struct super_block * sb)
+{
+	struct sysv_sb_info *sbi = SYSV_SB(sb);
+	unsigned int block;
+	sysv_zone_t nr;
+	struct buffer_head * bh;
+	unsigned count;
+
+	lock_super(sb);
+	count = fs16_to_cpu(sbi, *sbi->s_bcache_count);
+
+	if (count == 0) /* Applies only to Coherent FS */
+		goto Enospc;
+	nr = sbi->s_bcache[--count];
+	if (nr == 0)  /* Applies only to Xenix FS, SystemV FS */
+		goto Enospc;
+
+	block = fs32_to_cpu(sbi, nr);
+
+	*sbi->s_bcache_count = cpu_to_fs16(sbi, count);
+
+	if (block < sbi->s_firstdatazone || block >= sbi->s_nzones) {
+		printk("sysv_new_block: new block %d is not in data zone\n",
+			block);
+		goto Enospc;
+	}
+
+	if (count == 0) { /* the last block continues the free list */
+		unsigned count;
+
+		block += sbi->s_block_base;
+		if (!(bh = sb_bread(sb, block))) {
+			printk("sysv_new_block: cannot read free-list block\n");
+			/* retry this same block next time */
+			*sbi->s_bcache_count = cpu_to_fs16(sbi, 1);
+			goto Enospc;
+		}
+		count = fs16_to_cpu(sbi, *(__fs16*)bh->b_data);
+		if (count > sbi->s_flc_size) {
+			printk("sysv_new_block: free-list block with >flc_size entries\n");
+			brelse(bh);
+			goto Enospc;
+		}
+		*sbi->s_bcache_count = cpu_to_fs16(sbi, count);
+		memcpy(sbi->s_bcache, get_chunk(sb, bh),
+				count * sizeof(sysv_zone_t));
+		brelse(bh);
+	}
+	/* Now the free list head in the superblock is valid again. */
+	fs32_add(sbi, sbi->s_free_blocks, -1);
+	dirty_sb(sb);
+	unlock_super(sb);
+	return nr;
+
+Enospc:
+	unlock_super(sb);
+	return 0;
+}
+
+unsigned long sysv_count_free_blocks(struct super_block * sb)
+{
+	struct sysv_sb_info * sbi = SYSV_SB(sb);
+	int sb_count;
+	int count;
+	struct buffer_head * bh = NULL;
+	sysv_zone_t *blocks;
+	unsigned block;
+	int n;
+
+	/*
+	 * This code does not work at all for AFS (it has a bitmap
+	 * free list).  As AFS is supposed to be read-only we just
+	 * lie and say it has no free block at all.
+	 */
+	if (sbi->s_type == FSTYPE_AFS)
+		return 0;
+
+	lock_super(sb);
+	sb_count = fs32_to_cpu(sbi, *sbi->s_free_blocks);
+
+	if (0)
+		goto trust_sb;
+
+	/* this causes a lot of disk traffic ... */
+	count = 0;
+	n = fs16_to_cpu(sbi, *sbi->s_bcache_count);
+	blocks = sbi->s_bcache;
+	while (1) {
+		sysv_zone_t zone;
+		if (n > sbi->s_flc_size)
+			goto E2big;
+		zone = 0;
+		while (n && (zone = blocks[--n]) != 0)
+			count++;
+		if (zone == 0)
+			break;
+
+		block = fs32_to_cpu(sbi, zone);
+		if (bh)
+			brelse(bh);
+
+		if (block < sbi->s_firstdatazone || block >= sbi->s_nzones)
+			goto Einval;
+		block += sbi->s_block_base;
+		bh = sb_bread(sb, block);
+		if (!bh)
+			goto Eio;
+		n = fs16_to_cpu(sbi, *(__fs16*)bh->b_data);
+		blocks = get_chunk(sb, bh);
+	}
+	if (bh)
+		brelse(bh);
+	if (count != sb_count)
+		goto Ecount;
+done:
+	unlock_super(sb);
+	return count;
+
+Einval:
+	printk("sysv_count_free_blocks: new block %d is not in data zone\n",
+		block);
+	goto trust_sb;
+Eio:
+	printk("sysv_count_free_blocks: cannot read free-list block\n");
+	goto trust_sb;
+E2big:
+	printk("sysv_count_free_blocks: >flc_size entries in free-list block\n");
+	if (bh)
+		brelse(bh);
+trust_sb:
+	count = sb_count;
+	goto done;
+Ecount:
+	printk("sysv_count_free_blocks: free block count was %d, "
+		"correcting to %d\n", sb_count, count);
+	if (!(sb->s_flags & MS_RDONLY)) {
+		*sbi->s_free_blocks = cpu_to_fs32(sbi, count);
+		dirty_sb(sb);
+	}
+	goto done;
+}
diff --git a/fs/sysv/dir.c b/fs/sysv/dir.c
new file mode 100644
index 00000000000..69a085abad6
--- /dev/null
+++ b/fs/sysv/dir.c
@@ -0,0 +1,388 @@
+/*
+ *  linux/fs/sysv/dir.c
+ *
+ *  minix/dir.c
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *  coh/dir.c
+ *  Copyright (C) 1993  Pascal Haible, Bruno Haible
+ *
+ *  sysv/dir.c
+ *  Copyright (C) 1993  Bruno Haible
+ *
+ *  SystemV/Coherent directory handling functions
+ */
+
+#include <linux/pagemap.h>
+#include <linux/highmem.h>
+#include <linux/smp_lock.h>
+#include "sysv.h"
+
+static int sysv_readdir(struct file *, void *, filldir_t);
+
+struct file_operations sysv_dir_operations = {
+	.read		= generic_read_dir,
+	.readdir	= sysv_readdir,
+	.fsync		= sysv_sync_file,
+};
+
+static inline void dir_put_page(struct page *page)
+{
+	kunmap(page);
+	page_cache_release(page);
+}
+
+static inline unsigned long dir_pages(struct inode *inode)
+{
+	return (inode->i_size+PAGE_CACHE_SIZE-1)>>PAGE_CACHE_SHIFT;
+}
+
+static int dir_commit_chunk(struct page *page, unsigned from, unsigned to)
+{
+	struct inode *dir = (struct inode *)page->mapping->host;
+	int err = 0;
+
+	page->mapping->a_ops->commit_write(NULL, page, from, to);
+	if (IS_DIRSYNC(dir))
+		err = write_one_page(page, 1);
+	else
+		unlock_page(page);
+	return err;
+}
+
+static struct page * dir_get_page(struct inode *dir, unsigned long n)
+{
+	struct address_space *mapping = dir->i_mapping;
+	struct page *page = read_cache_page(mapping, n,
+				(filler_t*)mapping->a_ops->readpage, NULL);
+	if (!IS_ERR(page)) {
+		wait_on_page_locked(page);
+		kmap(page);
+		if (!PageUptodate(page))
+			goto fail;
+	}
+	return page;
+
+fail:
+	dir_put_page(page);
+	return ERR_PTR(-EIO);
+}
+
+static int sysv_readdir(struct file * filp, void * dirent, filldir_t filldir)
+{
+	unsigned long pos = filp->f_pos;
+	struct inode *inode = filp->f_dentry->d_inode;
+	struct super_block *sb = inode->i_sb;
+	unsigned offset = pos & ~PAGE_CACHE_MASK;
+	unsigned long n = pos >> PAGE_CACHE_SHIFT;
+	unsigned long npages = dir_pages(inode);
+
+	lock_kernel();
+
+	pos = (pos + SYSV_DIRSIZE-1) & ~(SYSV_DIRSIZE-1);
+	if (pos >= inode->i_size)
+		goto done;
+
+	for ( ; n < npages; n++, offset = 0) {
+		char *kaddr, *limit;
+		struct sysv_dir_entry *de;
+		struct page *page = dir_get_page(inode, n);
+
+		if (IS_ERR(page))
+			continue;
+		kaddr = (char *)page_address(page);
+		de = (struct sysv_dir_entry *)(kaddr+offset);
+		limit = kaddr + PAGE_CACHE_SIZE - SYSV_DIRSIZE;
+		for ( ;(char*)de <= limit; de++) {
+			char *name = de->name;
+			int over;
+
+			if (!de->inode)
+				continue;
+
+			offset = (char *)de - kaddr;
+
+			over = filldir(dirent, name, strnlen(name,SYSV_NAMELEN),
+					(n<<PAGE_CACHE_SHIFT) | offset,
+					fs16_to_cpu(SYSV_SB(sb), de->inode),
+					DT_UNKNOWN);
+			if (over) {
+				dir_put_page(page);
+				goto done;
+			}
+		}
+		dir_put_page(page);
+	}
+
+done:
+	filp->f_pos = (n << PAGE_CACHE_SHIFT) | offset;
+	unlock_kernel();
+	return 0;
+}
+
+/* compare strings: name[0..len-1] (not zero-terminated) and
+ * buffer[0..] (filled with zeroes up to buffer[0..maxlen-1])
+ */
+static inline int namecompare(int len, int maxlen,
+	const char * name, const char * buffer)
+{
+	if (len < maxlen && buffer[len])
+		return 0;
+	return !memcmp(name, buffer, len);
+}
+
+/*
+ *	sysv_find_entry()
+ *
+ * finds an entry in the specified directory with the wanted name. It
+ * returns the cache buffer in which the entry was found, and the entry
+ * itself (as a parameter - res_dir). It does NOT read the inode of the
+ * entry - you'll have to do that yourself if you want to.
+ */
+struct sysv_dir_entry *sysv_find_entry(struct dentry *dentry, struct page **res_page)
+{
+	const char * name = dentry->d_name.name;
+	int namelen = dentry->d_name.len;
+	struct inode * dir = dentry->d_parent->d_inode;
+	unsigned long start, n;
+	unsigned long npages = dir_pages(dir);
+	struct page *page = NULL;
+	struct sysv_dir_entry *de;
+
+	*res_page = NULL;
+
+	start = SYSV_I(dir)->i_dir_start_lookup;
+	if (start >= npages)
+		start = 0;
+	n = start;
+
+	do {
+		char *kaddr;
+		page = dir_get_page(dir, n);
+		if (!IS_ERR(page)) {
+			kaddr = (char*)page_address(page);
+			de = (struct sysv_dir_entry *) kaddr;
+			kaddr += PAGE_CACHE_SIZE - SYSV_DIRSIZE;
+			for ( ; (char *) de <= kaddr ; de++) {
+				if (!de->inode)
+					continue;
+				if (namecompare(namelen, SYSV_NAMELEN,
+							name, de->name))
+					goto found;
+			}
+		}
+		dir_put_page(page);
+
+		if (++n >= npages)
+			n = 0;
+	} while (n != start);
+
+	return NULL;
+
+found:
+	SYSV_I(dir)->i_dir_start_lookup = n;
+	*res_page = page;
+	return de;
+}
+
+int sysv_add_link(struct dentry *dentry, struct inode *inode)
+{
+	struct inode *dir = dentry->d_parent->d_inode;
+	const char * name = dentry->d_name.name;
+	int namelen = dentry->d_name.len;
+	struct page *page = NULL;
+	struct sysv_dir_entry * de;
+	unsigned long npages = dir_pages(dir);
+	unsigned long n;
+	char *kaddr;
+	unsigned from, to;
+	int err;
+
+	/* We take care of directory expansion in the same loop */
+	for (n = 0; n <= npages; n++) {
+		page = dir_get_page(dir, n);
+		err = PTR_ERR(page);
+		if (IS_ERR(page))
+			goto out;
+		kaddr = (char*)page_address(page);
+		de = (struct sysv_dir_entry *)kaddr;
+		kaddr += PAGE_CACHE_SIZE - SYSV_DIRSIZE;
+		while ((char *)de <= kaddr) {
+			if (!de->inode)
+				goto got_it;
+			err = -EEXIST;
+			if (namecompare(namelen, SYSV_NAMELEN, name, de->name)) 
+				goto out_page;
+			de++;
+		}
+		dir_put_page(page);
+	}
+	BUG();
+	return -EINVAL;
+
+got_it:
+	from = (char*)de - (char*)page_address(page);
+	to = from + SYSV_DIRSIZE;
+	lock_page(page);
+	err = page->mapping->a_ops->prepare_write(NULL, page, from, to);
+	if (err)
+		goto out_unlock;
+	memcpy (de->name, name, namelen);
+	memset (de->name + namelen, 0, SYSV_DIRSIZE - namelen - 2);
+	de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
+	err = dir_commit_chunk(page, from, to);
+	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
+	mark_inode_dirty(dir);
+out_page:
+	dir_put_page(page);
+out:
+	return err;
+out_unlock:
+	unlock_page(page);
+	goto out_page;
+}
+
+int sysv_delete_entry(struct sysv_dir_entry *de, struct page *page)
+{
+	struct address_space *mapping = page->mapping;
+	struct inode *inode = (struct inode*)mapping->host;
+	char *kaddr = (char*)page_address(page);
+	unsigned from = (char*)de - kaddr;
+	unsigned to = from + SYSV_DIRSIZE;
+	int err;
+
+	lock_page(page);
+	err = mapping->a_ops->prepare_write(NULL, page, from, to);
+	if (err)
+		BUG();
+	de->inode = 0;
+	err = dir_commit_chunk(page, from, to);
+	dir_put_page(page);
+	inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
+	mark_inode_dirty(inode);
+	return err;
+}
+
+int sysv_make_empty(struct inode *inode, struct inode *dir)
+{
+	struct address_space *mapping = inode->i_mapping;
+	struct page *page = grab_cache_page(mapping, 0);
+	struct sysv_dir_entry * de;
+	char *base;
+	int err;
+
+	if (!page)
+		return -ENOMEM;
+	kmap(page);
+	err = mapping->a_ops->prepare_write(NULL, page, 0, 2 * SYSV_DIRSIZE);
+	if (err) {
+		unlock_page(page);
+		goto fail;
+	}
+
+	base = (char*)page_address(page);
+	memset(base, 0, PAGE_CACHE_SIZE);
+
+	de = (struct sysv_dir_entry *) base;
+	de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
+	strcpy(de->name,".");
+	de++;
+	de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), dir->i_ino);
+	strcpy(de->name,"..");
+
+	err = dir_commit_chunk(page, 0, 2 * SYSV_DIRSIZE);
+fail:
+	kunmap(page);
+	page_cache_release(page);
+	return err;
+}
+
+/*
+ * routine to check that the specified directory is empty (for rmdir)
+ */
+int sysv_empty_dir(struct inode * inode)
+{
+	struct super_block *sb = inode->i_sb;
+	struct page *page = NULL;
+	unsigned long i, npages = dir_pages(inode);
+
+	for (i = 0; i < npages; i++) {
+		char *kaddr;
+		struct sysv_dir_entry * de;
+		page = dir_get_page(inode, i);
+
+		if (IS_ERR(page))
+			continue;
+
+		kaddr = (char *)page_address(page);
+		de = (struct sysv_dir_entry *)kaddr;
+		kaddr += PAGE_CACHE_SIZE-SYSV_DIRSIZE;
+
+		for ( ;(char *)de <= kaddr; de++) {
+			if (!de->inode)
+				continue;
+			/* check for . and .. */
+			if (de->name[0] != '.')
+				goto not_empty;
+			if (!de->name[1]) {
+				if (de->inode == cpu_to_fs16(SYSV_SB(sb),
+							inode->i_ino))
+					continue;
+				goto not_empty;
+			}
+			if (de->name[1] != '.' || de->name[2])
+				goto not_empty;
+		}
+		dir_put_page(page);
+	}
+	return 1;
+
+not_empty:
+	dir_put_page(page);
+	return 0;
+}
+
+/* Releases the page */
+void sysv_set_link(struct sysv_dir_entry *de, struct page *page,
+	struct inode *inode)
+{
+	struct inode *dir = (struct inode*)page->mapping->host;
+	unsigned from = (char *)de-(char*)page_address(page);
+	unsigned to = from + SYSV_DIRSIZE;
+	int err;
+
+	lock_page(page);
+	err = page->mapping->a_ops->prepare_write(NULL, page, from, to);
+	if (err)
+		BUG();
+	de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
+	err = dir_commit_chunk(page, from, to);
+	dir_put_page(page);
+	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
+	mark_inode_dirty(dir);
+}
+
+struct sysv_dir_entry * sysv_dotdot (struct inode *dir, struct page **p)
+{
+	struct page *page = dir_get_page(dir, 0);
+	struct sysv_dir_entry *de = NULL;
+
+	if (!IS_ERR(page)) {
+		de = (struct sysv_dir_entry*) page_address(page) + 1;
+		*p = page;
+	}
+	return de;
+}
+
+ino_t sysv_inode_by_name(struct dentry *dentry)
+{
+	struct page *page;
+	struct sysv_dir_entry *de = sysv_find_entry (dentry, &page);
+	ino_t res = 0;
+	
+	if (de) {
+		res = fs16_to_cpu(SYSV_SB(dentry->d_sb), de->inode);
+		dir_put_page(page);
+	}
+	return res;
+}
diff --git a/fs/sysv/file.c b/fs/sysv/file.c
new file mode 100644
index 00000000000..da69abc0624
--- /dev/null
+++ b/fs/sysv/file.c
@@ -0,0 +1,49 @@
+/*