--- /dev/null
+ fs/ext3/Makefile | 2
+ fs/ext3/dir.c | 302 +++++++++
+ fs/ext3/file.c | 3
+ fs/ext3/hash.c | 215 ++++++
+ fs/ext3/namei.c | 1421 ++++++++++++++++++++++++++++++++++++++++-----
+ fs/ext3/super.c | 7
+ include/linux/ext3_fs.h | 85 ++
+ include/linux/ext3_fs_sb.h | 2
+ include/linux/ext3_jbd.h | 2
+ include/linux/rbtree.h | 2
+ lib/rbtree.c | 42 +
+ 11 files changed, 1922 insertions(+), 161 deletions(-)
+
+Index: linux-2.4.21/fs/ext3/dir.c
+===================================================================
+--- linux-2.4.21.orig/fs/ext3/dir.c 2001-11-09 17:25:04.000000000 -0500
++++ linux-2.4.21/fs/ext3/dir.c 2004-09-16 19:41:03.000000000 -0400
+@@ -21,12 +21,16 @@
+ #include <linux/fs.h>
+ #include <linux/jbd.h>
+ #include <linux/ext3_fs.h>
++#include <linux/slab.h>
++#include <linux/rbtree.h>
+
+ static unsigned char ext3_filetype_table[] = {
+ DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
+ };
+
+ static int ext3_readdir(struct file *, void *, filldir_t);
++static int ext3_dx_readdir(struct file * filp,
++ void * dirent, filldir_t filldir);
+
+ struct file_operations ext3_dir_operations = {
+ read: generic_read_dir,
+@@ -35,6 +39,17 @@
+ fsync: ext3_sync_file, /* BKL held */
+ };
+
++
++static unsigned char get_dtype(struct super_block *sb, int filetype)
++{
++ if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_FILETYPE) ||
++ (filetype >= EXT3_FT_MAX))
++ return DT_UNKNOWN;
++
++ return (ext3_filetype_table[filetype]);
++}
++
++
+ int ext3_check_dir_entry (const char * function, struct inode * dir,
+ struct ext3_dir_entry_2 * de,
+ struct buffer_head * bh,
+@@ -79,6 +94,16 @@
+
+ sb = inode->i_sb;
+
++ if (is_dx(inode)) {
++ err = ext3_dx_readdir(filp, dirent, filldir);
++ if (err != ERR_BAD_DX_DIR)
++ return err;
++ /*
++ * We don't set the inode dirty flag since it's not
++ * critical that it get flushed back to the disk.
++ */
++ EXT3_I(filp->f_dentry->d_inode)->i_flags &= ~EXT3_INDEX_FL;
++ }
+ stored = 0;
+ bh = NULL;
+ offset = filp->f_pos & (sb->s_blocksize - 1);
+@@ -162,18 +187,12 @@
+ * during the copy operation.
+ */
+ unsigned long version = filp->f_version;
+- unsigned char d_type = DT_UNKNOWN;
+
+- if (EXT3_HAS_INCOMPAT_FEATURE(sb,
+- EXT3_FEATURE_INCOMPAT_FILETYPE)
+- && de->file_type < EXT3_FT_MAX)
+- d_type =
+- ext3_filetype_table[de->file_type];
+ error = filldir(dirent, de->name,
+ de->name_len,
+ filp->f_pos,
+ le32_to_cpu(de->inode),
+- d_type);
++ get_dtype(sb, de->file_type));
+ if (error)
+ break;
+ if (version != filp->f_version)
+@@ -188,3 +207,272 @@
+ UPDATE_ATIME(inode);
+ return 0;
+ }
++
++#ifdef CONFIG_EXT3_INDEX
++/*
++ * These functions convert from the major/minor hash to an f_pos
++ * value.
++ *
++ * Currently we only use major hash numer. This is unfortunate, but
++ * on 32-bit machines, the same VFS interface is used for lseek and
++ * llseek, so if we use the 64 bit offset, then the 32-bit versions of
++ * lseek/telldir/seekdir will blow out spectacularly, and from within
++ * the ext2 low-level routine, we don't know if we're being called by
++ * a 64-bit version of the system call or the 32-bit version of the
++ * system call. Worse yet, NFSv2 only allows for a 32-bit readdir
++ * cookie. Sigh.
++ */
++#define hash2pos(major, minor) (major >> 1)
++#define pos2maj_hash(pos) ((pos << 1) & 0xffffffff)
++#define pos2min_hash(pos) (0)
++
++/*
++ * This structure holds the nodes of the red-black tree used to store
++ * the directory entry in hash order.
++ */
++struct fname {
++ __u32 hash;
++ __u32 minor_hash;
++ rb_node_t rb_hash;
++ struct fname *next;
++ __u32 inode;
++ __u8 name_len;
++ __u8 file_type;
++ char name[0];
++};
++
++/*
++ * This functoin implements a non-recursive way of freeing all of the
++ * nodes in the red-black tree.
++ */
++static void free_rb_tree_fname(rb_root_t *root)
++{
++ rb_node_t *n = root->rb_node;
++ rb_node_t *parent;
++ struct fname *fname;
++
++ while (n) {
++ /* Do the node's children first */
++ if ((n)->rb_left) {
++ n = n->rb_left;
++ continue;
++ }
++ if (n->rb_right) {
++ n = n->rb_right;
++ continue;
++ }
++ /*
++ * The node has no children; free it, and then zero
++ * out parent's link to it. Finally go to the
++ * beginning of the loop and try to free the parent
++ * node.
++ */
++ parent = n->rb_parent;
++ fname = rb_entry(n, struct fname, rb_hash);
++ kfree(fname);
++ if (!parent)
++ root->rb_node = 0;
++ else if (parent->rb_left == n)
++ parent->rb_left = 0;
++ else if (parent->rb_right == n)
++ parent->rb_right = 0;
++ n = parent;
++ }
++ root->rb_node = 0;
++}
++
++
++struct dir_private_info *create_dir_info(loff_t pos)
++{
++ struct dir_private_info *p;
++
++ p = kmalloc(sizeof(struct dir_private_info), GFP_KERNEL);
++ if (!p)
++ return NULL;
++ p->root.rb_node = 0;
++ p->curr_node = 0;
++ p->extra_fname = 0;
++ p->last_pos = 0;
++ p->curr_hash = pos2maj_hash(pos);
++ p->curr_minor_hash = pos2min_hash(pos);
++ p->next_hash = 0;
++ return p;
++}
++
++void ext3_htree_free_dir_info(struct dir_private_info *p)
++{
++ free_rb_tree_fname(&p->root);
++ kfree(p);
++}
++
++/*
++ * Given a directory entry, enter it into the fname rb tree.
++ */
++int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
++ __u32 minor_hash,
++ struct ext3_dir_entry_2 *dirent)
++{
++ rb_node_t **p, *parent = NULL;
++ struct fname * fname, *new_fn;
++ struct dir_private_info *info;
++ int len;
++
++ info = (struct dir_private_info *) dir_file->private_data;
++ p = &info->root.rb_node;
++
++ /* Create and allocate the fname structure */
++ len = sizeof(struct fname) + dirent->name_len + 1;
++ new_fn = kmalloc(len, GFP_KERNEL);
++ if (!new_fn)
++ return -ENOMEM;
++ memset(new_fn, 0, len);
++ new_fn->hash = hash;
++ new_fn->minor_hash = minor_hash;
++ new_fn->inode = le32_to_cpu(dirent->inode);
++ new_fn->name_len = dirent->name_len;
++ new_fn->file_type = dirent->file_type;
++ memcpy(new_fn->name, dirent->name, dirent->name_len);
++ new_fn->name[dirent->name_len] = 0;
++
++ while (*p) {
++ parent = *p;
++ fname = rb_entry(parent, struct fname, rb_hash);
++
++ /*
++ * If the hash and minor hash match up, then we put
++ * them on a linked list. This rarely happens...
++ */
++ if ((new_fn->hash == fname->hash) &&
++ (new_fn->minor_hash == fname->minor_hash)) {
++ new_fn->next = fname->next;
++ fname->next = new_fn;
++ return 0;
++ }
++
++ if (new_fn->hash < fname->hash)
++ p = &(*p)->rb_left;
++ else if (new_fn->hash > fname->hash)
++ p = &(*p)->rb_right;
++ else if (new_fn->minor_hash < fname->minor_hash)
++ p = &(*p)->rb_left;
++ else /* if (new_fn->minor_hash > fname->minor_hash) */
++ p = &(*p)->rb_right;
++ }
++
++ rb_link_node(&new_fn->rb_hash, parent, p);
++ rb_insert_color(&new_fn->rb_hash, &info->root);
++ return 0;
++}
++
++
++
++/*
++ * This is a helper function for ext3_dx_readdir. It calls filldir
++ * for all entres on the fname linked list. (Normally there is only
++ * one entry on the linked list, unless there are 62 bit hash collisions.)
++ */
++static int call_filldir(struct file * filp, void * dirent,
++ filldir_t filldir, struct fname *fname)
++{
++ struct dir_private_info *info = filp->private_data;
++ loff_t curr_pos;
++ struct inode *inode = filp->f_dentry->d_inode;
++ struct super_block * sb;
++ int error;
++
++ sb = inode->i_sb;
++
++ if (!fname) {
++ printk("call_filldir: called with null fname?!?\n");
++ return 0;
++ }
++ curr_pos = hash2pos(fname->hash, fname->minor_hash);
++ while (fname) {
++ error = filldir(dirent, fname->name,
++ fname->name_len, curr_pos,
++ fname->inode,
++ get_dtype(sb, fname->file_type));
++ if (error) {
++ filp->f_pos = curr_pos;
++ info->extra_fname = fname->next;
++ return error;
++ }
++ fname = fname->next;
++ }
++ return 0;
++}
++
++static int ext3_dx_readdir(struct file * filp,
++ void * dirent, filldir_t filldir)
++{
++ struct dir_private_info *info = filp->private_data;
++ struct inode *inode = filp->f_dentry->d_inode;
++ struct fname *fname;
++ int ret;
++
++ if (!info) {
++ info = create_dir_info(filp->f_pos);
++ if (!info)
++ return -ENOMEM;
++ filp->private_data = info;
++ }
++
++ /* Some one has messed with f_pos; reset the world */
++ if (info->last_pos != filp->f_pos) {
++ free_rb_tree_fname(&info->root);
++ info->curr_node = 0;
++ info->extra_fname = 0;
++ info->curr_hash = pos2maj_hash(filp->f_pos);
++ info->curr_minor_hash = pos2min_hash(filp->f_pos);
++ }
++
++ /*
++ * If there are any leftover names on the hash collision
++ * chain, return them first.
++ */
++ if (info->extra_fname &&
++ call_filldir(filp, dirent, filldir, info->extra_fname))
++ goto finished;
++
++ if (!info->curr_node)
++ info->curr_node = rb_first(&info->root);
++
++ while (1) {
++ /*
++ * Fill the rbtree if we have no more entries,
++ * or the inode has changed since we last read in the
++ * cached entries.
++ */
++ if ((!info->curr_node) ||
++ (filp->f_version != inode->i_version)) {
++ info->curr_node = 0;
++ free_rb_tree_fname(&info->root);
++ filp->f_version = inode->i_version;
++ ret = ext3_htree_fill_tree(filp, info->curr_hash,
++ info->curr_minor_hash,
++ &info->next_hash);
++ if (ret < 0)
++ return ret;
++ if (ret == 0)
++ break;
++ info->curr_node = rb_first(&info->root);
++ }
++
++ fname = rb_entry(info->curr_node, struct fname, rb_hash);
++ info->curr_hash = fname->hash;
++ info->curr_minor_hash = fname->minor_hash;
++ if (call_filldir(filp, dirent, filldir, fname))
++ break;
++
++ info->curr_node = rb_next(info->curr_node);
++ if (!info->curr_node) {
++ info->curr_hash = info->next_hash;
++ info->curr_minor_hash = 0;
++ }
++ }
++finished:
++ info->last_pos = filp->f_pos;
++ UPDATE_ATIME(inode);
++ return 0;
++}
++#endif
+Index: linux-2.4.21/fs/ext3/file.c
+===================================================================
+--- linux-2.4.21.orig/fs/ext3/file.c 2004-09-11 10:16:28.000000000 -0400
++++ linux-2.4.21/fs/ext3/file.c 2004-09-16 19:40:16.000000000 -0400
+@@ -38,6 +38,9 @@
+ {
+ if (filp->f_mode & FMODE_WRITE)
+ ext3_discard_prealloc (inode);
++ if (is_dx(inode) && filp->private_data)
++ ext3_htree_free_dir_info(filp->private_data);
++
+ return 0;
+ }
+
+Index: linux-2.4.21/fs/ext3/hash.c
+===================================================================
+--- linux-2.4.21.orig/fs/ext3/hash.c 1969-12-31 19:00:00.000000000 -0500
++++ linux-2.4.21/fs/ext3/hash.c 2004-09-16 19:40:16.000000000 -0400
+@@ -0,0 +1,215 @@
++/*
++ * linux/fs/ext3/hash.c
++ *
++ * Copyright (C) 2002 by Theodore Ts'o
++ *
++ * This file is released under the GPL v2.
++ *
++ * This file may be redistributed under the terms of the GNU Public
++ * License.
++ */
++
++#include <linux/fs.h>
++#include <linux/jbd.h>
++#include <linux/sched.h>
++#include <linux/ext3_fs.h>
++
++#define DELTA 0x9E3779B9
++
++static void TEA_transform(__u32 buf[4], __u32 const in[])
++{
++ __u32 sum = 0;
++ __u32 b0 = buf[0], b1 = buf[1];
++ __u32 a = in[0], b = in[1], c = in[2], d = in[3];
++ int n = 16;
++
++ do {
++ sum += DELTA;
++ b0 += ((b1 << 4)+a) ^ (b1+sum) ^ ((b1 >> 5)+b);
++ b1 += ((b0 << 4)+c) ^ (b0+sum) ^ ((b0 >> 5)+d);
++ } while(--n);
++
++ buf[0] += b0;
++ buf[1] += b1;
++}
++
++/* F, G and H are basic MD4 functions: selection, majority, parity */
++#define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
++#define G(x, y, z) (((x) & (y)) + (((x) ^ (y)) & (z)))
++#define H(x, y, z) ((x) ^ (y) ^ (z))
++
++/*
++ * The generic round function. The application is so specific that
++ * we don't bother protecting all the arguments with parens, as is generally
++ * good macro practice, in favor of extra legibility.
++ * Rotation is separate from addition to prevent recomputation
++ */
++#define ROUND(f, a, b, c, d, x, s) \
++ (a += f(b, c, d) + x, a = (a << s) | (a >> (32-s)))
++#define K1 0
++#define K2 013240474631UL
++#define K3 015666365641UL
++
++/*
++ * Basic cut-down MD4 transform. Returns only 32 bits of result.
++ */
++static void halfMD4Transform (__u32 buf[4], __u32 const in[])
++{
++ __u32 a = buf[0], b = buf[1], c = buf[2], d = buf[3];
++
++ /* Round 1 */
++ ROUND(F, a, b, c, d, in[0] + K1, 3);
++ ROUND(F, d, a, b, c, in[1] + K1, 7);
++ ROUND(F, c, d, a, b, in[2] + K1, 11);
++ ROUND(F, b, c, d, a, in[3] + K1, 19);
++ ROUND(F, a, b, c, d, in[4] + K1, 3);
++ ROUND(F, d, a, b, c, in[5] + K1, 7);
++ ROUND(F, c, d, a, b, in[6] + K1, 11);
++ ROUND(F, b, c, d, a, in[7] + K1, 19);
++
++ /* Round 2 */
++ ROUND(G, a, b, c, d, in[1] + K2, 3);
++ ROUND(G, d, a, b, c, in[3] + K2, 5);
++ ROUND(G, c, d, a, b, in[5] + K2, 9);
++ ROUND(G, b, c, d, a, in[7] + K2, 13);
++ ROUND(G, a, b, c, d, in[0] + K2, 3);
++ ROUND(G, d, a, b, c, in[2] + K2, 5);
++ ROUND(G, c, d, a, b, in[4] + K2, 9);
++ ROUND(G, b, c, d, a, in[6] + K2, 13);
++
++ /* Round 3 */
++ ROUND(H, a, b, c, d, in[3] + K3, 3);
++ ROUND(H, d, a, b, c, in[7] + K3, 9);
++ ROUND(H, c, d, a, b, in[2] + K3, 11);
++ ROUND(H, b, c, d, a, in[6] + K3, 15);
++ ROUND(H, a, b, c, d, in[1] + K3, 3);
++ ROUND(H, d, a, b, c, in[5] + K3, 9);
++ ROUND(H, c, d, a, b, in[0] + K3, 11);
++ ROUND(H, b, c, d, a, in[4] + K3, 15);
++
++ buf[0] += a;
++ buf[1] += b;
++ buf[2] += c;
++ buf[3] += d;
++}
++
++#undef ROUND
++#undef F
++#undef G
++#undef H
++#undef K1
++#undef K2
++#undef K3
++
++/* The old legacy hash */
++static __u32 dx_hack_hash (const char *name, int len)
++{
++ __u32 hash0 = 0x12a3fe2d, hash1 = 0x37abe8f9;
++ while (len--) {
++ __u32 hash = hash1 + (hash0 ^ (*name++ * 7152373));
++
++ if (hash & 0x80000000) hash -= 0x7fffffff;
++ hash1 = hash0;
++ hash0 = hash;
++ }
++ return (hash0 << 1);
++}
++
++static void str2hashbuf(const char *msg, int len, __u32 *buf, int num)
++{
++ __u32 pad, val;
++ int i;
++
++ pad = (__u32)len | ((__u32)len << 8);
++ pad |= pad << 16;
++
++ val = pad;
++ if (len > num*4)
++ len = num * 4;
++ for (i=0; i < len; i++) {
++ if ((i % 4) == 0)
++ val = pad;
++ val = msg[i] + (val << 8);
++ if ((i % 4) == 3) {
++ *buf++ = val;
++ val = pad;
++ num--;
++ }
++ }
++ if (--num >= 0)
++ *buf++ = val;
++ while (--num >= 0)
++ *buf++ = pad;
++}
++
++/*
++ * Returns the hash of a filename. If len is 0 and name is NULL, then
++ * this function can be used to test whether or not a hash version is
++ * supported.
++ *
++ * The seed is an 4 longword (32 bits) "secret" which can be used to
++ * uniquify a hash. If the seed is all zero's, then some default seed
++ * may be used.
++ *
++ * A particular hash version specifies whether or not the seed is
++ * represented, and whether or not the returned hash is 32 bits or 64
++ * bits. 32 bit hashes will return 0 for the minor hash.
++ */
++int ext3fs_dirhash(const char *name, int len, struct dx_hash_info *hinfo)
++{
++ __u32 hash;
++ __u32 minor_hash = 0;
++ const char *p;
++ int i;
++ __u32 in[8], buf[4];
++
++ /* Initialize the default seed for the hash checksum functions */
++ buf[0] = 0x67452301;
++ buf[1] = 0xefcdab89;
++ buf[2] = 0x98badcfe;
++ buf[3] = 0x10325476;
++
++ /* Check to see if the seed is all zero's */
++ if (hinfo->seed) {
++ for (i=0; i < 4; i++) {
++ if (hinfo->seed[i])
++ break;
++ }
++ if (i < 4)
++ memcpy(buf, hinfo->seed, sizeof(buf));
++ }
++
++ switch (hinfo->hash_version) {
++ case DX_HASH_LEGACY:
++ hash = dx_hack_hash(name, len);
++ break;
++ case DX_HASH_HALF_MD4:
++ p = name;
++ while (len > 0) {
++ str2hashbuf(p, len, in, 8);
++ halfMD4Transform(buf, in);
++ len -= 32;
++ p += 32;
++ }
++ minor_hash = buf[2];
++ hash = buf[1];
++ break;
++ case DX_HASH_TEA:
++ p = name;
++ while (len > 0) {
++ str2hashbuf(p, len, in, 4);
++ TEA_transform(buf, in);
++ len -= 16;
++ p += 16;
++ }
++ hash = buf[0];
++ minor_hash = buf[1];
++ break;
++ default:
++ hinfo->hash = 0;
++ return -1;
++ }
++ hinfo->hash = hash & ~1;
++ hinfo->minor_hash = minor_hash;
++ return 0;
++}
+Index: linux-2.4.21/fs/ext3/Makefile
+===================================================================
+--- linux-2.4.21.orig/fs/ext3/Makefile 2004-09-16 19:21:00.000000000 -0400
++++ linux-2.4.21/fs/ext3/Makefile 2004-09-16 19:40:16.000000000 -0400
+@@ -12,7 +12,7 @@
+ export-objs := super.o inode.o
+
+ obj-y := balloc.o bitmap.o dir.o file.o fsync.o ialloc.o inode.o \
+- ioctl.o namei.o super.o symlink.o
++ ioctl.o namei.o super.o symlink.o hash.o
+ obj-m := $(O_TARGET)
+
+ export-objs += xattr.o
+Index: linux-2.4.21/fs/ext3/namei.c
+===================================================================
+--- linux-2.4.21.orig/fs/ext3/namei.c 2004-09-11 10:16:28.000000000 -0400
++++ linux-2.4.21/fs/ext3/namei.c 2004-09-16 19:40:16.000000000 -0400
+@@ -16,6 +16,12 @@
+ * David S. Miller (davem@caip.rutgers.edu), 1995
+ * Directory entry file type support and forward compatibility hooks
+ * for B-tree directories by Theodore Ts'o (tytso@mit.edu), 1998
++ * Hash Tree Directory indexing (c)
++ * Daniel Phillips, 2001
++ * Hash Tree Directory indexing porting
++ * Christopher Li, 2002
++ * Hash Tree Directory indexing cleanup
++ * Theodore Ts'o, 2002
+ */
+
+ #include <linux/fs.h>
+@@ -40,6 +46,642 @@
+ #define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
+ #define NAMEI_RA_INDEX(c,b) (((c) * NAMEI_RA_BLOCKS) + (b))
+
++static struct buffer_head *ext3_append(handle_t *handle,
++ struct inode *inode,
++ u32 *block, int *err)
++{
++ struct buffer_head *bh;
++
++ *block = inode->i_size >> inode->i_sb->s_blocksize_bits;
++
++ if ((bh = ext3_bread(handle, inode, *block, 1, err))) {
++ inode->i_size += inode->i_sb->s_blocksize;
++ EXT3_I(inode)->i_disksize = inode->i_size;
++ ext3_journal_get_write_access(handle,bh);
++ }
++ return bh;
++}
++
++#ifndef assert
++#define assert(test) J_ASSERT(test)
++#endif
++
++#ifndef swap
++#define swap(x, y) do { typeof(x) z = x; x = y; y = z; } while (0)
++#endif
++
++typedef struct { u32 v; } le_u32;
++typedef struct { u16 v; } le_u16;
++
++#ifdef DX_DEBUG
++#define dxtrace(command) command
++#else
++#define dxtrace(command)
++#endif
++
++struct fake_dirent
++{
++ /*le*/u32 inode;
++ /*le*/u16 rec_len;
++ u8 name_len;
++ u8 file_type;
++};
++
++struct dx_countlimit
++{
++ le_u16 limit;
++ le_u16 count;
++};
++
++struct dx_entry
++{
++ le_u32 hash;
++ le_u32 block;
++};
++
++/*
++ * dx_root_info is laid out so that if it should somehow get overlaid by a
++ * dirent the two low bits of the hash version will be zero. Therefore, the
++ * hash version mod 4 should never be 0. Sincerely, the paranoia department.
++ */
++
++struct dx_root
++{
++ struct fake_dirent dot;
++ char dot_name[4];
++ struct fake_dirent dotdot;
++ char dotdot_name[4];
++ struct dx_root_info
++ {
++ le_u32 reserved_zero;
++ u8 hash_version;
++ u8 info_length; /* 8 */
++ u8 indirect_levels;
++ u8 unused_flags;
++ }
++ info;
++ struct dx_entry entries[0];
++};
++
++struct dx_node
++{
++ struct fake_dirent fake;
++ struct dx_entry entries[0];
++};
++
++
++struct dx_frame
++{
++ struct buffer_head *bh;
++ struct dx_entry *entries;
++ struct dx_entry *at;
++};
++
++struct dx_map_entry
++{
++ u32 hash;
++ u32 offs;
++};
++
++#ifdef CONFIG_EXT3_INDEX
++static inline unsigned dx_get_block (struct dx_entry *entry);
++static void dx_set_block (struct dx_entry *entry, unsigned value);
++static inline unsigned dx_get_hash (struct dx_entry *entry);
++static void dx_set_hash (struct dx_entry *entry, unsigned value);
++static unsigned dx_get_count (struct dx_entry *entries);
++static unsigned dx_get_limit (struct dx_entry *entries);
++static void dx_set_count (struct dx_entry *entries, unsigned value);
++static void dx_set_limit (struct dx_entry *entries, unsigned value);
++static unsigned dx_root_limit (struct inode *dir, unsigned infosize);
++static unsigned dx_node_limit (struct inode *dir);
++static struct dx_frame *dx_probe(struct dentry *dentry,
++ struct inode *dir,
++ struct dx_hash_info *hinfo,
++ struct dx_frame *frame,
++ int *err);
++static void dx_release (struct dx_frame *frames);
++static int dx_make_map (struct ext3_dir_entry_2 *de, int size,
++ struct dx_hash_info *hinfo, struct dx_map_entry map[]);
++static void dx_sort_map(struct dx_map_entry *map, unsigned count);
++static struct ext3_dir_entry_2 *dx_move_dirents (char *from, char *to,
++ struct dx_map_entry *offsets, int count);
++static struct ext3_dir_entry_2* dx_pack_dirents (char *base, int size);
++static void dx_insert_block (struct dx_frame *frame, u32 hash, u32 block);
++static int ext3_htree_next_block(struct inode *dir, __u32 hash,
++ struct dx_frame *frame,
++ struct dx_frame *frames, int *err,
++ __u32 *start_hash);
++static struct buffer_head * ext3_dx_find_entry(struct dentry *dentry,
++ struct ext3_dir_entry_2 **res_dir, int *err);
++static int ext3_dx_add_entry(handle_t *handle, struct dentry *dentry,
++ struct inode *inode);
++
++/*
++ * Future: use high four bits of block for coalesce-on-delete flags
++ * Mask them off for now.
++ */
++
++static inline unsigned dx_get_block (struct dx_entry *entry)
++{
++ return le32_to_cpu(entry->block.v) & 0x00ffffff;
++}
++
++static inline void dx_set_block (struct dx_entry *entry, unsigned value)
++{
++ entry->block.v = cpu_to_le32(value);
++}
++
++static inline unsigned dx_get_hash (struct dx_entry *entry)
++{
++ return le32_to_cpu(entry->hash.v);
++}
++
++static inline void dx_set_hash (struct dx_entry *entry, unsigned value)
++{
++ entry->hash.v = cpu_to_le32(value);
++}
++
++static inline unsigned dx_get_count (struct dx_entry *entries)
++{
++ return le16_to_cpu(((struct dx_countlimit *) entries)->count.v);
++}
++
++static inline unsigned dx_get_limit (struct dx_entry *entries)
++{
++ return le16_to_cpu(((struct dx_countlimit *) entries)->limit.v);
++}
++
++static inline void dx_set_count (struct dx_entry *entries, unsigned value)
++{
++ ((struct dx_countlimit *) entries)->count.v = cpu_to_le16(value);
++}
++
++static inline void dx_set_limit (struct dx_entry *entries, unsigned value)
++{
++ ((struct dx_countlimit *) entries)->limit.v = cpu_to_le16(value);
++}
++
++static inline unsigned dx_root_limit (struct inode *dir, unsigned infosize)
++{
++ unsigned entry_space = dir->i_sb->s_blocksize - EXT3_DIR_REC_LEN(1) -
++ EXT3_DIR_REC_LEN(2) - infosize;
++ return 0? 20: entry_space / sizeof(struct dx_entry);
++}
++
++static inline unsigned dx_node_limit (struct inode *dir)
++{
++ unsigned entry_space = dir->i_sb->s_blocksize - EXT3_DIR_REC_LEN(0);
++ return 0? 22: entry_space / sizeof(struct dx_entry);
++}
++
++/*
++ * Debug
++ */
++#ifdef DX_DEBUG
++struct stats
++{
++ unsigned names;
++ unsigned space;
++ unsigned bcount;
++};
++
++static struct stats dx_show_leaf(struct dx_hash_info *hinfo, struct ext3_dir_entry_2 *de,
++ int size, int show_names)
++{
++ unsigned names = 0, space = 0;
++ char *base = (char *) de;
++ struct dx_hash_info h = *hinfo;
++
++ printk("names: ");
++ while ((char *) de < base + size)
++ {
++ if (de->inode)
++ {
++ if (show_names)
++ {
++ int len = de->name_len;
++ char *name = de->name;
++ while (len--) printk("%c", *name++);
++ ext3fs_dirhash(de->name, de->name_len, &h);
++ printk(":%x.%u ", h.hash,
++ ((char *) de - base));
++ }
++ space += EXT3_DIR_REC_LEN(de->name_len);
++ names++;
++ }
++ de = (struct ext3_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
++ }
++ printk("(%i)\n", names);
++ return (struct stats) { names, space, 1 };
++}
++
++struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir,
++ struct dx_entry *entries, int levels)
++{
++ unsigned blocksize = dir->i_sb->s_blocksize;
++ unsigned count = dx_get_count (entries), names = 0, space = 0, i;
++ unsigned bcount = 0;
++ struct buffer_head *bh;
++ int err;
++ printk("%i indexed blocks...\n", count);
++ for (i = 0; i < count; i++, entries++)
++ {
++ u32 block = dx_get_block(entries), hash = i? dx_get_hash(entries): 0;
++ u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash;
++ struct stats stats;
++ printk("%s%3u:%03u hash %8x/%8x ",levels?"":" ", i, block, hash, range);
++ if (!(bh = ext3_bread (NULL,dir, block, 0,&err))) continue;
++ stats = levels?
++ dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1):
++ dx_show_leaf(hinfo, (struct ext3_dir_entry_2 *) bh->b_data, blocksize, 0);
++ names += stats.names;
++ space += stats.space;
++ bcount += stats.bcount;
++ brelse (bh);
++ }
++ if (bcount)
++ printk("%snames %u, fullness %u (%u%%)\n", levels?"":" ",
++ names, space/bcount,(space/bcount)*100/blocksize);
++ return (struct stats) { names, space, bcount};
++}
++#endif /* DX_DEBUG */
++
++/*
++ * Probe for a directory leaf block to search.
++ *
++ * dx_probe can return ERR_BAD_DX_DIR, which means there was a format
++ * error in the directory index, and the caller should fall back to
++ * searching the directory normally. The callers of dx_probe **MUST**
++ * check for this error code, and make sure it never gets reflected
++ * back to userspace.
++ */
++static struct dx_frame *
++dx_probe(struct dentry *dentry, struct inode *dir,
++ struct dx_hash_info *hinfo, struct dx_frame *frame_in, int *err)
++{
++ unsigned count, indirect;
++ struct dx_entry *at, *entries, *p, *q, *m;
++ struct dx_root *root;
++ struct buffer_head *bh;
++ struct dx_frame *frame = frame_in;
++ u32 hash;
++
++ frame->bh = NULL;
++ if (dentry)
++ dir = dentry->d_parent->d_inode;
++ if (!(bh = ext3_bread (NULL,dir, 0, 0, err)))
++ goto fail;
++ root = (struct dx_root *) bh->b_data;
++ if (root->info.hash_version != DX_HASH_TEA &&
++ root->info.hash_version != DX_HASH_HALF_MD4 &&
++ root->info.hash_version != DX_HASH_LEGACY) {
++ ext3_warning(dir->i_sb, __FUNCTION__,
++ "Unrecognised inode hash code %d",
++ root->info.hash_version);
++ brelse(bh);
++ *err = ERR_BAD_DX_DIR;
++ goto fail;
++ }
++ hinfo->hash_version = root->info.hash_version;
++ hinfo->seed = dir->i_sb->u.ext3_sb.s_hash_seed;
++ if (dentry)
++ ext3fs_dirhash(dentry->d_name.name, dentry->d_name.len, hinfo);
++ hash = hinfo->hash;
++
++ if (root->info.unused_flags & 1) {
++ ext3_warning(dir->i_sb, __FUNCTION__,
++ "Unimplemented inode hash flags: %#06x",
++ root->info.unused_flags);
++ brelse(bh);
++ *err = ERR_BAD_DX_DIR;
++ goto fail;
++ }
++
++ if ((indirect = root->info.indirect_levels) > 1) {
++ ext3_warning(dir->i_sb, __FUNCTION__,
++ "Unimplemented inode hash depth: %#06x",
++ root->info.indirect_levels);
++ brelse(bh);
++ *err = ERR_BAD_DX_DIR;
++ goto fail;
++ }
++
++ entries = (struct dx_entry *) (((char *)&root->info) +
++ root->info.info_length);
++ assert(dx_get_limit(entries) == dx_root_limit(dir,
++ root->info.info_length));
++ dxtrace (printk("Look up %x", hash));
++ while (1)
++ {
++ count = dx_get_count(entries);
++ assert (count && count <= dx_get_limit(entries));
++ p = entries + 1;
++ q = entries + count - 1;
++ while (p <= q)
++ {
++ m = p + (q - p)/2;
++ dxtrace(printk("."));
++ if (dx_get_hash(m) > hash)
++ q = m - 1;
++ else
++ p = m + 1;
++ }
++
++ if (0) // linear search cross check
++ {
++ unsigned n = count - 1;
++ at = entries;
++ while (n--)
++ {
++ dxtrace(printk(","));
++ if (dx_get_hash(++at) > hash)
++ {
++ at--;
++ break;
++ }
++ }
++ assert (at == p - 1);
++ }
++
++ at = p - 1;
++ dxtrace(printk(" %x->%u\n", at == entries? 0: dx_get_hash(at), dx_get_block(at)));
++ frame->bh = bh;
++ frame->entries = entries;
++ frame->at = at;
++ if (!indirect--) return frame;
++ if (!(bh = ext3_bread (NULL,dir, dx_get_block(at), 0, err)))
++ goto fail2;
++ at = entries = ((struct dx_node *) bh->b_data)->entries;
++ assert (dx_get_limit(entries) == dx_node_limit (dir));
++ frame++;
++ }
++fail2:
++ while (frame >= frame_in) {
++ brelse(frame->bh);
++ frame--;
++ }
++fail:
++ return NULL;
++}
++
++static void dx_release (struct dx_frame *frames)
++{
++ if (frames[0].bh == NULL)
++ return;
++
++ if (((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels)
++ brelse(frames[1].bh);
++ brelse(frames[0].bh);
++}
++
++/*
++ * This function increments the frame pointer to search the next leaf
++ * block, and reads in the necessary intervening nodes if the search
++ * should be necessary. Whether or not the search is necessary is
++ * controlled by the hash parameter. If the hash value is even, then
++ * the search is only continued if the next block starts with that
++ * hash value. This is used if we are searching for a specific file.
++ *
++ * If the hash value is HASH_NB_ALWAYS, then always go to the next block.
++ *
++ * This function returns 1 if the caller should continue to search,
++ * or 0 if it should not. If there is an error reading one of the
++ * index blocks, it will return -1.
++ *
++ * If start_hash is non-null, it will be filled in with the starting
++ * hash of the next page.
++ */
++static int ext3_htree_next_block(struct inode *dir, __u32 hash,
++ struct dx_frame *frame,
++ struct dx_frame *frames, int *err,
++ __u32 *start_hash)
++{
++ struct dx_frame *p;
++ struct buffer_head *bh;
++ int num_frames = 0;
++ __u32 bhash;
++
++ *err = ENOENT;
++ p = frame;
++ /*
++ * Find the next leaf page by incrementing the frame pointer.
++ * If we run out of entries in the interior node, loop around and
++ * increment pointer in the parent node. When we break out of
++ * this loop, num_frames indicates the number of interior
++ * nodes need to be read.
++ */
++ while (1) {
++ if (++(p->at) < p->entries + dx_get_count(p->entries))
++ break;
++ if (p == frames)
++ return 0;
++ num_frames++;
++ p--;
++ }
++
++ /*
++ * If the hash is 1, then continue only if the next page has a
++ * continuation hash of any value. This is used for readdir
++ * handling. Otherwise, check to see if the hash matches the
++ * desired contiuation hash. If it doesn't, return since
++ * there's no point to read in the successive index pages.
++ */
++ bhash = dx_get_hash(p->at);
++ if (start_hash)
++ *start_hash = bhash;
++ if ((hash & 1) == 0) {
++ if ((bhash & ~1) != hash)
++ return 0;
++ }
++ /*
++ * If the hash is HASH_NB_ALWAYS, we always go to the next
++ * block so no check is necessary
++ */
++ while (num_frames--) {
++ if (!(bh = ext3_bread(NULL, dir, dx_get_block(p->at),
++ 0, err)))
++ return -1; /* Failure */
++ p++;
++ brelse (p->bh);
++ p->bh = bh;
++ p->at = p->entries = ((struct dx_node *) bh->b_data)->entries;
++ }
++ return 1;
++}
++
++
++/*
++ * p is at least 6 bytes before the end of page
++ */
++static inline struct ext3_dir_entry_2 *ext3_next_entry(struct ext3_dir_entry_2 *p)
++{
++ return (struct ext3_dir_entry_2 *)((char*)p + le16_to_cpu(p->rec_len));
++}
++
++/*
++ * This function fills a red-black tree with information from a
++ * directory. We start scanning the directory in hash order, starting
++ * at start_hash and start_minor_hash.
++ *
++ * This function returns the number of entries inserted into the tree,
++ * or a negative error code.
++ */
++int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
++ __u32 start_minor_hash, __u32 *next_hash)
++{
++ struct dx_hash_info hinfo;
++ struct buffer_head *bh;
++ struct ext3_dir_entry_2 *de, *top;
++ static struct dx_frame frames[2], *frame;
++ struct inode *dir;
++ int block, err;
++ int count = 0;
++ int ret;
++ __u32 hashval;
++
++ dxtrace(printk("In htree_fill_tree, start hash: %x:%x\n", start_hash,
++ start_minor_hash));
++ dir = dir_file->f_dentry->d_inode;
++ hinfo.hash = start_hash;
++ hinfo.minor_hash = 0;
++ frame = dx_probe(0, dir_file->f_dentry->d_inode, &hinfo, frames, &err);
++ if (!frame)
++ return err;
++
++ /* Add '.' and '..' from the htree header */
++ if (!start_hash && !start_minor_hash) {
++ de = (struct ext3_dir_entry_2 *) frames[0].bh->b_data;
++ if ((err = ext3_htree_store_dirent(dir_file, 0, 0, de)) != 0)
++ goto errout;
++ de = ext3_next_entry(de);
++ if ((err = ext3_htree_store_dirent(dir_file, 0, 0, de)) != 0)
++ goto errout;
++ count += 2;
++ }
++
++ while (1) {
++ block = dx_get_block(frame->at);
++ dxtrace(printk("Reading block %d\n", block));
++ if (!(bh = ext3_bread (NULL, dir, block, 0, &err)))
++ goto errout;
++
++ de = (struct ext3_dir_entry_2 *) bh->b_data;
++ top = (struct ext3_dir_entry_2 *) ((char *) de + dir->i_sb->s_blocksize -
++ EXT3_DIR_REC_LEN(0));
++ for (; de < top; de = ext3_next_entry(de)) {
++ ext3fs_dirhash(de->name, de->name_len, &hinfo);
++ if ((hinfo.hash < start_hash) ||
++ ((hinfo.hash == start_hash) &&
++ (hinfo.minor_hash < start_minor_hash)))
++ continue;
++ if ((err = ext3_htree_store_dirent(dir_file,
++ hinfo.hash, hinfo.minor_hash, de)) != 0)
++ goto errout;
++ count++;
++ }
++ brelse (bh);
++ hashval = ~1;
++ ret = ext3_htree_next_block(dir, HASH_NB_ALWAYS,
++ frame, frames, &err, &hashval);
++ if (next_hash)
++ *next_hash = hashval;
++ if (ret == -1)
++ goto errout;
++ /*
++ * Stop if: (a) there are no more entries, or
++ * (b) we have inserted at least one entry and the
++ * next hash value is not a continuation
++ */
++ if ((ret == 0) ||
++ (count && ((hashval & 1) == 0)))
++ break;
++ }
++ dx_release(frames);
++ dxtrace(printk("Fill tree: returned %d entries\n", count));
++ return count;
++errout:
++ dx_release(frames);
++ return (err);
++}
++
++
++/*
++ * Directory block splitting, compacting
++ */
++
++static int dx_make_map (struct ext3_dir_entry_2 *de, int size,
++ struct dx_hash_info *hinfo, struct dx_map_entry *map_tail)
++{
++ int count = 0;
++ char *base = (char *) de;
++ struct dx_hash_info h = *hinfo;
++
++ while ((char *) de < base + size)
++ {
++ if (de->name_len && de->inode) {
++ ext3fs_dirhash(de->name, de->name_len, &h);
++ map_tail--;
++ map_tail->hash = h.hash;
++ map_tail->offs = (u32) ((char *) de - base);
++ count++;
++ }
++ /* XXX: do we need to check rec_len == 0 case? -Chris */
++ de = (struct ext3_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
++ }
++ return count;
++}
++
++static void dx_sort_map (struct dx_map_entry *map, unsigned count)
++{
++ struct dx_map_entry *p, *q, *top = map + count - 1;
++ int more;
++ /* Combsort until bubble sort doesn't suck */
++ while (count > 2)
++ {
++ count = count*10/13;
++ if (count - 9 < 2) /* 9, 10 -> 11 */
++ count = 11;
++ for (p = top, q = p - count; q >= map; p--, q--)
++ if (p->hash < q->hash)
++ swap(*p, *q);
++ }
++ /* Garden variety bubble sort */
++ do {
++ more = 0;
++ q = top;
++ while (q-- > map)
++ {
++ if (q[1].hash >= q[0].hash)
++ continue;
++ swap(*(q+1), *q);
++ more = 1;
++ }
++ } while(more);
++}
++
++static void dx_insert_block(struct dx_frame *frame, u32 hash, u32 block)
++{
++ struct dx_entry *entries = frame->entries;
++ struct dx_entry *old = frame->at, *new = old + 1;
++ int count = dx_get_count(entries);
++
++ assert(count < dx_get_limit(entries));
++ assert(old < entries + count);
++ memmove(new + 1, new, (char *)(entries + count) - (char *)(new));
++ dx_set_hash(new, hash);
++ dx_set_block(new, block);
++ dx_set_count(entries, count + 1);
++}
++#endif
++
++
++static void ext3_update_dx_flag(struct inode *inode)
++{
++ if (!EXT3_HAS_COMPAT_FEATURE(inode->i_sb,
++ EXT3_FEATURE_COMPAT_DIR_INDEX))
++ EXT3_I(inode)->i_flags &= ~EXT3_INDEX_FL;
++}
++
+ /*
+ * NOTE! unlike strncmp, ext3_match returns 1 for success, 0 for failure.
+ *
+@@ -96,6 +738,7 @@
+ return 0;
+ }
+
++
+ /*
+ * ext3_find_entry()
+ *
+@@ -107,6 +750,8 @@
+ * The returned buffer_head has ->b_count elevated. The caller is expected
+ * to brelse() it when appropriate.
+ */
++
++
+ static struct buffer_head * ext3_find_entry (struct dentry *dentry,
+ struct ext3_dir_entry_2 ** res_dir)
+ {
+@@ -121,12 +766,32 @@
+ int num = 0;
+ int nblocks, i, err;
+ struct inode *dir = dentry->d_parent->d_inode;
++ int namelen;
++ const u8 *name;
++ unsigned blocksize;
+
+ *res_dir = NULL;
+ sb = dir->i_sb;
+-
++ blocksize = sb->s_blocksize;
++ namelen = dentry->d_name.len;
++ name = dentry->d_name.name;
++ if (namelen > EXT3_NAME_LEN)
++ return NULL;
++#ifdef CONFIG_EXT3_INDEX
++ if (is_dx(dir)) {
++ bh = ext3_dx_find_entry(dentry, res_dir, &err);
++ /*
++ * On success, or if the error was file not found,
++ * return. Otherwise, fall back to doing a search the
++ * old fashioned way.
++ */
++ if (bh || (err != ERR_BAD_DX_DIR))
++ return bh;
++ dxtrace(printk("ext3_find_entry: dx failed, falling back\n"));
++ }
++#endif
+ nblocks = dir->i_size >> EXT3_BLOCK_SIZE_BITS(sb);
+- start = dir->u.ext3_i.i_dir_start_lookup;
++ start = EXT3_I(dir)->i_dir_start_lookup;
+ if (start >= nblocks)
+ start = 0;
+ block = start;
+@@ -167,7 +832,7 @@
+ i = search_dirblock(bh, dir, dentry,
+ block << EXT3_BLOCK_SIZE_BITS(sb), res_dir);
+ if (i == 1) {
+- dir->u.ext3_i.i_dir_start_lookup = block;
++ EXT3_I(dir)->i_dir_start_lookup = block;
+ ret = bh;
+ goto cleanup_and_exit;
+ } else {
+@@ -198,6 +863,66 @@
+ return ret;
+ }
+
++#ifdef CONFIG_EXT3_INDEX
++static struct buffer_head * ext3_dx_find_entry(struct dentry *dentry,
++ struct ext3_dir_entry_2 **res_dir, int *err)
++{
++ struct super_block * sb;
++ struct dx_hash_info hinfo;
++ u32 hash;
++ struct dx_frame frames[2], *frame;
++ struct ext3_dir_entry_2 *de, *top;
++ struct buffer_head *bh;
++ unsigned long block;
++ int retval;
++ int namelen = dentry->d_name.len;
++ const u8 *name = dentry->d_name.name;
++ struct inode *dir = dentry->d_parent->d_inode;
++
++ sb = dir->i_sb;
++ if (!(frame = dx_probe (dentry, 0, &hinfo, frames, err)))
++ return NULL;
++ hash = hinfo.hash;
++ do {
++ block = dx_get_block(frame->at);
++ if (!(bh = ext3_bread (NULL,dir, block, 0, err)))
++ goto errout;
++ de = (struct ext3_dir_entry_2 *) bh->b_data;
++ top = (struct ext3_dir_entry_2 *) ((char *) de + sb->s_blocksize -
++ EXT3_DIR_REC_LEN(0));
++ for (; de < top; de = ext3_next_entry(de))
++ if (ext3_match (namelen, name, de)) {
++ if (!ext3_check_dir_entry("ext3_find_entry",
++ dir, de, bh,
++ (block<<EXT3_BLOCK_SIZE_BITS(sb))
++ +((char *)de - bh->b_data))) {
++ brelse (bh);
++ goto errout;
++ }
++ *res_dir = de;
++ dx_release (frames);
++ return bh;
++ }
++ brelse (bh);
++ /* Check to see if we should continue to search */
++ retval = ext3_htree_next_block(dir, hash, frame,
++ frames, err, 0);
++ if (retval == -1) {
++ ext3_warning(sb, __FUNCTION__,
++ "error reading index page in directory #%lu",
++ dir->i_ino);
++ goto errout;
++ }
++ } while (retval == 1);
++
++ *err = -ENOENT;
++errout:
++ dxtrace(printk("%s not found\n", name));
++ dx_release (frames);
++ return NULL;
++}
++#endif
++
+ static struct dentry *ext3_lookup(struct inode * dir, struct dentry *dentry)
+ {
+ struct inode * inode;
+@@ -214,8 +939,9 @@
+ brelse (bh);
+ inode = iget(dir->i_sb, ino);
+
+- if (!inode)
++ if (!inode) {
+ return ERR_PTR(-EACCES);
++ }
+ }
+ d_add(dentry, inode);
+ return NULL;
+@@ -239,6 +965,301 @@
+ de->file_type = ext3_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
+ }
+
++#ifdef CONFIG_EXT3_INDEX
++static struct ext3_dir_entry_2 *
++dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count)
++{
++ unsigned rec_len = 0;
++
++ while (count--) {
++ struct ext3_dir_entry_2 *de = (struct ext3_dir_entry_2 *) (from + map->offs);
++ rec_len = EXT3_DIR_REC_LEN(de->name_len);
++ memcpy (to, de, rec_len);
++ ((struct ext3_dir_entry_2 *)to)->rec_len = cpu_to_le16(rec_len);
++ de->inode = 0;
++ map++;
++ to += rec_len;
++ }
++ return (struct ext3_dir_entry_2 *) (to - rec_len);
++}
++
++static struct ext3_dir_entry_2* dx_pack_dirents(char *base, int size)
++{
++ struct ext3_dir_entry_2 *next, *to, *prev, *de = (struct ext3_dir_entry_2 *) base;
++ unsigned rec_len = 0;
++
++ prev = to = de;
++ while ((char*)de < base + size) {
++ next = (struct ext3_dir_entry_2 *) ((char *) de +
++ le16_to_cpu(de->rec_len));
++ if (de->inode && de->name_len) {
++ rec_len = EXT3_DIR_REC_LEN(de->name_len);
++ if (de > to)
++ memmove(to, de, rec_len);
++ to->rec_len = cpu_to_le16(rec_len);
++ prev = to;
++ to = (struct ext3_dir_entry_2 *)((char *) to + rec_len);
++ }
++ de = next;
++ }
++ return prev;
++}
++
++static struct ext3_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
++ struct buffer_head **bh,struct dx_frame *frame,
++ struct dx_hash_info *hinfo, int *error)
++{
++ unsigned blocksize = dir->i_sb->s_blocksize;
++ unsigned count, continued;
++ struct buffer_head *bh2;
++ u32 newblock;
++ u32 hash2;
++ struct dx_map_entry *map;
++ char *data1 = (*bh)->b_data, *data2;
++ unsigned split;
++ struct ext3_dir_entry_2 *de = NULL, *de2;
++ int err;
++
++ bh2 = ext3_append (handle, dir, &newblock, error);
++ if (!(bh2)) {
++ brelse(*bh);
++ *bh = NULL;
++ goto errout;
++ }
++
++ BUFFER_TRACE(*bh, "get_write_access");
++ err = ext3_journal_get_write_access(handle, *bh);
++ if (err) {
++ journal_error:
++ brelse(*bh);
++ brelse(bh2);
++ *bh = NULL;
++ ext3_std_error(dir->i_sb, err);
++ goto errout;
++ }
++ BUFFER_TRACE(frame->bh, "get_write_access");
++ err = ext3_journal_get_write_access(handle, frame->bh);
++ if (err)
++ goto journal_error;
++
++ data2 = bh2->b_data;
++
++ /* create map in the end of data2 block */
++ map = (struct dx_map_entry *) (data2 + blocksize);
++ count = dx_make_map ((struct ext3_dir_entry_2 *) data1,
++ blocksize, hinfo, map);
++ map -= count;
++ split = count/2; // need to adjust to actual middle
++ dx_sort_map (map, count);
++ hash2 = map[split].hash;
++ continued = hash2 == map[split - 1].hash;
++ dxtrace(printk("Split block %i at %x, %i/%i\n",
++ dx_get_block(frame->at), hash2, split, count-split));
++
++ /* Fancy dance to stay within two buffers */
++ de2 = dx_move_dirents(data1, data2, map + split, count - split);
++ de = dx_pack_dirents(data1,blocksize);
++ de->rec_len = cpu_to_le16(data1 + blocksize - (char *) de);
++ de2->rec_len = cpu_to_le16(data2 + blocksize - (char *) de2);
++ dxtrace(dx_show_leaf (hinfo, (struct ext3_dir_entry_2 *) data1, blocksize, 1));
++ dxtrace(dx_show_leaf (hinfo, (struct ext3_dir_entry_2 *) data2, blocksize, 1));
++
++ /* Which block gets the new entry? */
++ if (hinfo->hash >= hash2)
++ {
++ swap(*bh, bh2);
++ de = de2;
++ }
++ dx_insert_block (frame, hash2 + continued, newblock);
++ err = ext3_journal_dirty_metadata (handle, bh2);
++ if (err)
++ goto journal_error;
++ err = ext3_journal_dirty_metadata (handle, frame->bh);
++ if (err)
++ goto journal_error;
++ brelse (bh2);
++ dxtrace(dx_show_index ("frame", frame->entries));
++errout:
++ return de;
++}
++#endif
++
++
++/*
++ * Add a new entry into a directory (leaf) block. If de is non-NULL,
++ * it points to a directory entry which is guaranteed to be large
++ * enough for new directory entry. If de is NULL, then
++ * add_dirent_to_buf will attempt search the directory block for
++ * space. It will return -ENOSPC if no space is available, and -EIO
++ * and -EEXIST if directory entry already exists.
++ *
++ * NOTE! bh is NOT released in the case where ENOSPC is returned. In
++ * all other cases bh is released.
++ */
++static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry,
++ struct inode *inode, struct ext3_dir_entry_2 *de,
++ struct buffer_head * bh)
++{
++ struct inode *dir = dentry->d_parent->d_inode;
++ const char *name = dentry->d_name.name;
++ int namelen = dentry->d_name.len;
++ unsigned long offset = 0;
++ unsigned short reclen;
++ int nlen, rlen, err;
++ char *top;
++
++ reclen = EXT3_DIR_REC_LEN(namelen);
++ if (!de) {
++ de = (struct ext3_dir_entry_2 *)bh->b_data;
++ top = bh->b_data + dir->i_sb->s_blocksize - reclen;
++ while ((char *) de <= top) {
++ if (!ext3_check_dir_entry("ext3_add_entry", dir, de,
++ bh, offset)) {
++ brelse (bh);
++ return -EIO;
++ }
++ if (ext3_match (namelen, name, de)) {
++ brelse (bh);
++ return -EEXIST;
++ }
++ nlen = EXT3_DIR_REC_LEN(de->name_len);
++ rlen = le16_to_cpu(de->rec_len);
++ if ((de->inode? rlen - nlen: rlen) >= reclen)
++ break;
++ de = (struct ext3_dir_entry_2 *)((char *)de + rlen);
++ offset += rlen;
++ }
++ if ((char *) de > top)
++ return -ENOSPC;
++ }
++ BUFFER_TRACE(bh, "get_write_access");
++ err = ext3_journal_get_write_access(handle, bh);
++ if (err) {
++ ext3_std_error(dir->i_sb, err);
++ brelse(bh);
++ return err;
++ }
++
++ /* By now the buffer is marked for journaling */
++ nlen = EXT3_DIR_REC_LEN(de->name_len);
++ rlen = le16_to_cpu(de->rec_len);
++ if (de->inode) {
++ struct ext3_dir_entry_2 *de1 = (struct ext3_dir_entry_2 *)((char *)de + nlen);
++ de1->rec_len = cpu_to_le16(rlen - nlen);
++ de->rec_len = cpu_to_le16(nlen);
++ de = de1;
++ }
++ de->file_type = EXT3_FT_UNKNOWN;
++ if (inode) {
++ de->inode = cpu_to_le32(inode->i_ino);
++ ext3_set_de_type(dir->i_sb, de, inode->i_mode);
++ } else
++ de->inode = 0;
++ de->name_len = namelen;
++ memcpy (de->name, name, namelen);
++ /*
++ * XXX shouldn't update any times until successful
++ * completion of syscall, but too many callers depend
++ * on this.
++ *
++ * XXX similarly, too many callers depend on
++ * ext3_new_inode() setting the times, but error
++ * recovery deletes the inode, so the worst that can
++ * happen is that the times are slightly out of date
++ * and/or different from the directory change time.
++ */
++ dir->i_mtime = dir->i_ctime = CURRENT_TIME;
++ ext3_update_dx_flag(dir);
++ dir->i_version = ++event;
++ ext3_mark_inode_dirty(handle, dir);
++ BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata");
++ err = ext3_journal_dirty_metadata(handle, bh);
++ if (err)
++ ext3_std_error(dir->i_sb, err);
++ brelse(bh);
++ return 0;
++}
++
++#ifdef CONFIG_EXT3_INDEX
++/*
++ * This converts a one block unindexed directory to a 3 block indexed
++ * directory, and adds the dentry to the indexed directory.
++ */
++static int make_indexed_dir(handle_t *handle, struct dentry *dentry,
++ struct inode *inode, struct buffer_head *bh)
++{
++ struct inode *dir = dentry->d_parent->d_inode;
++ const char *name = dentry->d_name.name;
++ int namelen = dentry->d_name.len;
++ struct buffer_head *bh2;
++ struct dx_root *root;
++ struct dx_frame frames[2], *frame;
++ struct dx_entry *entries;
++ struct ext3_dir_entry_2 *de, *de2;
++ char *data1, *top;
++ unsigned len;
++ int retval;
++ unsigned blocksize;
++ struct dx_hash_info hinfo;
++ u32 block;
++
++ blocksize = dir->i_sb->s_blocksize;
++ dxtrace(printk("Creating index\n"));
++ retval = ext3_journal_get_write_access(handle, bh);
++ if (retval) {
++ ext3_std_error(dir->i_sb, retval);
++ brelse(bh);
++ return retval;
++ }
++ root = (struct dx_root *) bh->b_data;
++
++ EXT3_I(dir)->i_flags |= EXT3_INDEX_FL;
++ bh2 = ext3_append (handle, dir, &block, &retval);
++ if (!(bh2)) {
++ brelse(bh);
++ return retval;
++ }
++ data1 = bh2->b_data;
++
++ /* The 0th block becomes the root, move the dirents out */
++ de = (struct ext3_dir_entry_2 *)&root->dotdot;
++ de = (struct ext3_dir_entry_2 *)((char *)de + le16_to_cpu(de->rec_len));
++ len = ((char *) root) + blocksize - (char *) de;
++ memcpy (data1, de, len);
++ de = (struct ext3_dir_entry_2 *) data1;
++ top = data1 + len;
++ while (((char *) de2=(char*)de+le16_to_cpu(de->rec_len)) < top)
++ de = de2;
++ de->rec_len = cpu_to_le16(data1 + blocksize - (char *) de);
++ /* Initialize the root; the dot dirents already exist */
++ de = (struct ext3_dir_entry_2 *) (&root->dotdot);
++ de->rec_len = cpu_to_le16(blocksize - EXT3_DIR_REC_LEN(2));
++ memset (&root->info, 0, sizeof(root->info));
++ root->info.info_length = sizeof(root->info);
++ root->info.hash_version = dir->i_sb->u.ext3_sb.s_def_hash_version;
++ entries = root->entries;
++ dx_set_block (entries, 1);
++ dx_set_count (entries, 1);
++ dx_set_limit (entries, dx_root_limit(dir, sizeof(root->info)));
++
++ /* Initialize as for dx_probe */
++ hinfo.hash_version = root->info.hash_version;
++ hinfo.seed = dir->i_sb->u.ext3_sb.s_hash_seed;
++ ext3fs_dirhash(name, namelen, &hinfo);
++ frame = frames;
++ frame->entries = entries;
++ frame->at = entries;
++ frame->bh = bh;
++ bh = bh2;
++ de = do_split(handle,dir, &bh, frame, &hinfo, &retval);
++ dx_release (frames);
++ if (!(de))
++ return retval;
++
++ return add_dirent_to_buf(handle, dentry, inode, de, bh);
++}
++#endif
++
+ /*
+ * ext3_add_entry()
+ *
+@@ -249,127 +1270,198 @@
+ * may not sleep between calling this and putting something into
+ * the entry, as someone else might have used it while you slept.
+ */
+-
+-/*
+- * AKPM: the journalling code here looks wrong on the error paths
+- */
+ static int ext3_add_entry (handle_t *handle, 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;
+ unsigned long offset;
+- unsigned short rec_len;
+ struct buffer_head * bh;
+- struct ext3_dir_entry_2 * de, * de1;
++ struct ext3_dir_entry_2 *de;
+ struct super_block * sb;
+ int retval;
++#ifdef CONFIG_EXT3_INDEX
++ int dx_fallback=0;
++#endif
++ unsigned blocksize;
++ unsigned nlen, rlen;
++ u32 block, blocks;
+
+ sb = dir->i_sb;
+-
+- if (!namelen)
++ blocksize = sb->s_blocksize;
++ if (!dentry->d_name.len)
+ return -EINVAL;
+- bh = ext3_bread (handle, dir, 0, 0, &retval);
++#ifdef CONFIG_EXT3_INDEX
++ if (is_dx(dir)) {
++ retval = ext3_dx_add_entry(handle, dentry, inode);
++ if (!retval || (retval != ERR_BAD_DX_DIR))
++ return retval;
++ EXT3_I(dir)->i_flags &= ~EXT3_INDEX_FL;
++ dx_fallback++;
++ ext3_mark_inode_dirty(handle, dir);
++ }
++#endif
++ blocks = dir->i_size >> sb->s_blocksize_bits;
++ for (block = 0, offset = 0; block < blocks; block++) {
++ bh = ext3_bread(handle, dir, block, 0, &retval);
++ if(!bh)
++ return retval;
++ retval = add_dirent_to_buf(handle, dentry, inode, 0, bh);
++ if (retval != -ENOSPC)
++ return retval;
++
++#ifdef CONFIG_EXT3_INDEX
++ if (blocks == 1 && !dx_fallback &&
++ EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_DIR_INDEX))
++ return make_indexed_dir(handle, dentry, inode, bh);
++#endif
++ brelse(bh);
++ }
++ bh = ext3_append(handle, dir, &block, &retval);
+ if (!bh)
+ return retval;
+- rec_len = EXT3_DIR_REC_LEN(namelen);
+- offset = 0;
+ de = (struct ext3_dir_entry_2 *) bh->b_data;
+- while (1) {
+- if ((char *)de >= sb->s_blocksize + bh->b_data) {
+- brelse (bh);
+- bh = NULL;
+- bh = ext3_bread (handle, dir,
+- offset >> EXT3_BLOCK_SIZE_BITS(sb), 1, &retval);
+- if (!bh)
+- return retval;
+- if (dir->i_size <= offset) {
+- if (dir->i_size == 0) {
+- brelse(bh);
+- return -ENOENT;
+- }
++ de->inode = 0;
++ de->rec_len = cpu_to_le16(rlen = blocksize);
++ nlen = 0;
++ return add_dirent_to_buf(handle, dentry, inode, de, bh);
++}
+
+- ext3_debug ("creating next block\n");
++#ifdef CONFIG_EXT3_INDEX
++/*
++ * Returns 0 for success, or a negative error value
++ */
++static int ext3_dx_add_entry(handle_t *handle, struct dentry *dentry,
++ struct inode *inode)
++{
++ struct dx_frame frames[2], *frame;
++ struct dx_entry *entries, *at;
++ struct dx_hash_info hinfo;
++ struct buffer_head * bh;
++ struct inode *dir = dentry->d_parent->d_inode;
++ struct super_block * sb = dir->i_sb;
++ struct ext3_dir_entry_2 *de;
++ int err;
+
+- BUFFER_TRACE(bh, "get_write_access");
+- ext3_journal_get_write_access(handle, bh);
+- de = (struct ext3_dir_entry_2 *) bh->b_data;
+- de->inode = 0;
+- de->rec_len = le16_to_cpu(sb->s_blocksize);
+- dir->u.ext3_i.i_disksize =
+- dir->i_size = offset + sb->s_blocksize;
+- dir->u.ext3_i.i_flags &= ~EXT3_INDEX_FL;
+- ext3_mark_inode_dirty(handle, dir);
+- } else {
++ frame = dx_probe(dentry, 0, &hinfo, frames, &err);
++ if (!frame)
++ return err;
++ entries = frame->entries;
++ at = frame->at;
+
+- ext3_debug ("skipping to next block\n");
++ if (!(bh = ext3_bread(handle,dir, dx_get_block(frame->at), 0, &err)))
++ goto cleanup;
+
+- de = (struct ext3_dir_entry_2 *) bh->b_data;
+- }
+- }
+- if (!ext3_check_dir_entry ("ext3_add_entry", dir, de, bh,
+- offset)) {
+- brelse (bh);
+- return -ENOENT;
+- }
+- if (ext3_match (namelen, name, de)) {
+- brelse (bh);
+- return -EEXIST;
++ BUFFER_TRACE(bh, "get_write_access");
++ err = ext3_journal_get_write_access(handle, bh);
++ if (err)
++ goto journal_error;
++
++ err = add_dirent_to_buf(handle, dentry, inode, 0, bh);
++ if (err != -ENOSPC) {
++ bh = 0;
++ goto cleanup;
++ }
++
++ /* Block full, should compress but for now just split */
++ dxtrace(printk("using %u of %u node entries\n",
++ dx_get_count(entries), dx_get_limit(entries)));
++ /* Need to split index? */
++ if (dx_get_count(entries) == dx_get_limit(entries)) {
++ u32 newblock;
++ unsigned icount = dx_get_count(entries);
++ int levels = frame - frames;
++ struct dx_entry *entries2;
++ struct dx_node *node2;
++ struct buffer_head *bh2;
++
++ if (levels && (dx_get_count(frames->entries) ==
++ dx_get_limit(frames->entries))) {
++ ext3_warning(sb, __FUNCTION__,
++ "Directory index full!\n");
++ err = -ENOSPC;
++ goto cleanup;
+ }
+- if ((le32_to_cpu(de->inode) == 0 &&
+- le16_to_cpu(de->rec_len) >= rec_len) ||
+- (le16_to_cpu(de->rec_len) >=
+- EXT3_DIR_REC_LEN(de->name_len) + rec_len)) {
+- BUFFER_TRACE(bh, "get_write_access");
+- ext3_journal_get_write_access(handle, bh);
+- /* By now the buffer is marked for journaling */
+- offset += le16_to_cpu(de->rec_len);
+- if (le32_to_cpu(de->inode)) {
+- de1 = (struct ext3_dir_entry_2 *) ((char *) de +
+- EXT3_DIR_REC_LEN(de->name_len));
+- de1->rec_len =
+- cpu_to_le16(le16_to_cpu(de->rec_len) -
+- EXT3_DIR_REC_LEN(de->name_len));
+- de->rec_len = cpu_to_le16(
+- EXT3_DIR_REC_LEN(de->name_len));
+- de = de1;
++ bh2 = ext3_append (handle, dir, &newblock, &err);
++ if (!(bh2))
++ goto cleanup;
++ node2 = (struct dx_node *)(bh2->b_data);
++ entries2 = node2->entries;
++ node2->fake.rec_len = cpu_to_le16(sb->s_blocksize);
++ node2->fake.inode = 0;
++ BUFFER_TRACE(frame->bh, "get_write_access");
++ err = ext3_journal_get_write_access(handle, frame->bh);
++ if (err)
++ goto journal_error;
++ if (levels) {
++ unsigned icount1 = icount/2, icount2 = icount - icount1;
++ unsigned hash2 = dx_get_hash(entries + icount1);
++ dxtrace(printk("Split index %i/%i\n", icount1, icount2));
++
++ BUFFER_TRACE(frame->bh, "get_write_access"); /* index root */
++ err = ext3_journal_get_write_access(handle,
++ frames[0].bh);
++ if (err)
++ goto journal_error;
++
++ memcpy ((char *) entries2, (char *) (entries + icount1),
++ icount2 * sizeof(struct dx_entry));
++ dx_set_count (entries, icount1);
++ dx_set_count (entries2, icount2);
++ dx_set_limit (entries2, dx_node_limit(dir));
++
++ /* Which index block gets the new entry? */
++ if (at - entries >= icount1) {
++ frame->at = at = at - entries - icount1 + entries2;
++ frame->entries = entries = entries2;
++ swap(frame->bh, bh2);
+ }
+- de->file_type = EXT3_FT_UNKNOWN;
+- if (inode) {
+- de->inode = cpu_to_le32(inode->i_ino);
+- ext3_set_de_type(dir->i_sb, de, inode->i_mode);
+- } else
+- de->inode = 0;
+- de->name_len = namelen;
+- memcpy (de->name, name, namelen);
+- /*
+- * XXX shouldn't update any times until successful
+- * completion of syscall, but too many callers depend
+- * on this.
+- *
+- * XXX similarly, too many callers depend on
+- * ext3_new_inode() setting the times, but error
+- * recovery deletes the inode, so the worst that can
+- * happen is that the times are slightly out of date
+- * and/or different from the directory change time.
+- */
+- dir->i_mtime = dir->i_ctime = CURRENT_TIME;
+- dir->u.ext3_i.i_flags &= ~EXT3_INDEX_FL;
+- dir->i_version = ++event;
+- ext3_mark_inode_dirty(handle, dir);
+- BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata");
+- ext3_journal_dirty_metadata(handle, bh);
+- brelse(bh);
+- return 0;
++ dx_insert_block (frames + 0, hash2, newblock);
++ dxtrace(dx_show_index ("node", frames[1].entries));
++ dxtrace(dx_show_index ("node",
++ ((struct dx_node *) bh2->b_data)->entries));
++ err = ext3_journal_dirty_metadata(handle, bh2);
++ if (err)
++ goto journal_error;
++ brelse (bh2);
++ } else {
++ dxtrace(printk("Creating second level index...\n"));
++ memcpy((char *) entries2, (char *) entries,
++ icount * sizeof(struct dx_entry));
++ dx_set_limit(entries2, dx_node_limit(dir));
++
++ /* Set up root */
++ dx_set_count(entries, 1);
++ dx_set_block(entries + 0, newblock);
++ ((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels = 1;
++
++ /* Add new access path frame */
++ frame = frames + 1;
++ frame->at = at = at - entries + entries2;
++ frame->entries = entries = entries2;
++ frame->bh = bh2;
++ err = ext3_journal_get_write_access(handle,
++ frame->bh);
++ if (err)
++ goto journal_error;
+ }
+- offset += le16_to_cpu(de->rec_len);
+- de = (struct ext3_dir_entry_2 *)
+- ((char *) de + le16_to_cpu(de->rec_len));
++ ext3_journal_dirty_metadata(handle, frames[0].bh);
+ }
+- brelse (bh);
+- return -ENOSPC;
++ de = do_split(handle, dir, &bh, frame, &hinfo, &err);
++ if (!de)
++ goto cleanup;
++ err = add_dirent_to_buf(handle, dentry, inode, de, bh);
++ bh = 0;
++ goto cleanup;
++
++journal_error:
++ ext3_std_error(dir->i_sb, err);
++cleanup:
++ if (bh)
++ brelse(bh);
++ dx_release(frames);
++ return err;
+ }
++#endif
+
+ /*
+ * ext3_delete_entry deletes a directory entry by merging it with the
+@@ -456,9 +1548,11 @@
+ struct inode * inode;
+ int err;
+
+- handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS + 3);
+- if (IS_ERR(handle))
++ handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS +
++ EXT3_INDEX_EXTRA_TRANS_BLOCKS + 3);
++ if (IS_ERR(handle)) {
+ return PTR_ERR(handle);
++ }
+
+ if (IS_SYNC(dir))
+ handle->h_sync = 1;
+@@ -482,9 +1576,11 @@
+ struct inode *inode;
+ int err;
+
+- handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS + 3);
+- if (IS_ERR(handle))
++ handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS +
++ EXT3_INDEX_EXTRA_TRANS_BLOCKS + 3);
++ if (IS_ERR(handle)) {
+ return PTR_ERR(handle);
++ }
+
+ if (IS_SYNC(dir))
+ handle->h_sync = 1;
+@@ -513,9 +1609,11 @@
+ if (dir->i_nlink >= EXT3_LINK_MAX)
+ return -EMLINK;
+
+- handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS + 3);
+- if (IS_ERR(handle))
++ handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS +
++ EXT3_INDEX_EXTRA_TRANS_BLOCKS + 3);
++ if (IS_ERR(handle)) {
+ return PTR_ERR(handle);
++ }
+
+ if (IS_SYNC(dir))
+ handle->h_sync = 1;
+@@ -527,7 +1625,7 @@
+
+ inode->i_op = &ext3_dir_inode_operations;
+ inode->i_fop = &ext3_dir_operations;
+- inode->i_size = inode->u.ext3_i.i_disksize = inode->i_sb->s_blocksize;
++ inode->i_size = EXT3_I(inode)->i_disksize = inode->i_sb->s_blocksize;
+ dir_block = ext3_bread (handle, inode, 0, 1, &err);
+ if (!dir_block) {
+ inode->i_nlink--; /* is this nlink == 0? */
+@@ -556,21 +1654,19 @@
+ brelse (dir_block);
+ ext3_mark_inode_dirty(handle, inode);
+ err = ext3_add_entry (handle, dentry, inode);
+- if (err)
+- goto out_no_entry;
++ if (err) {
++ inode->i_nlink = 0;
++ ext3_mark_inode_dirty(handle, inode);
++ iput (inode);
++ goto out_stop;
++ }
+ dir->i_nlink++;
+- dir->u.ext3_i.i_flags &= ~EXT3_INDEX_FL;
++ ext3_update_dx_flag(dir);
+ ext3_mark_inode_dirty(handle, dir);
+ d_instantiate(dentry, inode);
+ out_stop:
+ ext3_journal_stop(handle, dir);
+ return err;
+-
+-out_no_entry:
+- inode->i_nlink = 0;
+- ext3_mark_inode_dirty(handle, inode);
+- iput (inode);
+- goto out_stop;
+ }
+
+ /*
+@@ -657,7 +1753,7 @@
+ int err = 0, rc;
+
+ lock_super(sb);
+- if (!list_empty(&inode->u.ext3_i.i_orphan))
++ if (!list_empty(&EXT3_I(inode)->i_orphan))
+ goto out_unlock;
+
+ /* Orphan handling is only valid for files with data blocks
+@@ -698,7 +1794,7 @@
+ * This is safe: on error we're going to ignore the orphan list
+ * anyway on the next recovery. */
+ if (!err)
+- list_add(&inode->u.ext3_i.i_orphan, &EXT3_SB(sb)->s_orphan);
++ list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
+
+ jbd_debug(4, "superblock will point to %ld\n", inode->i_ino);
+ jbd_debug(4, "orphan inode %ld will point to %d\n",
+@@ -716,25 +1812,26 @@
+ int ext3_orphan_del(handle_t *handle, struct inode *inode)
+ {
+ struct list_head *prev;
++ struct ext3_inode_info *ei = EXT3_I(inode);
+ struct ext3_sb_info *sbi;
+ unsigned long ino_next;
+ struct ext3_iloc iloc;
+ int err = 0;
+
+ lock_super(inode->i_sb);
+- if (list_empty(&inode->u.ext3_i.i_orphan)) {
++ if (list_empty(&ei->i_orphan)) {
+ unlock_super(inode->i_sb);
+ return 0;
+ }
+
+ ino_next = NEXT_ORPHAN(inode);
+- prev = inode->u.ext3_i.i_orphan.prev;
++ prev = ei->i_orphan.prev;
+ sbi = EXT3_SB(inode->i_sb);
+
+ jbd_debug(4, "remove inode %lu from orphan list\n", inode->i_ino);
+
+- list_del(&inode->u.ext3_i.i_orphan);
+- INIT_LIST_HEAD(&inode->u.ext3_i.i_orphan);
++ list_del(&ei->i_orphan);
++ INIT_LIST_HEAD(&ei->i_orphan);
+
+ /* If we're on an error path, we may not have a valid
+ * transaction handle with which to update the orphan list on
+@@ -795,8 +1892,9 @@
+ handle_t *handle;
+
+ handle = ext3_journal_start(dir, EXT3_DELETE_TRANS_BLOCKS);
+- if (IS_ERR(handle))
++ if (IS_ERR(handle)) {
+ return PTR_ERR(handle);
++ }
+
+ retval = -ENOENT;
+ bh = ext3_find_entry (dentry, &de);
+@@ -834,7 +1932,7 @@
+ dir->i_nlink--;
+ inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
+ ext3_mark_inode_dirty(handle, inode);
+- dir->u.ext3_i.i_flags &= ~EXT3_INDEX_FL;
++ ext3_update_dx_flag(dir);
+ ext3_mark_inode_dirty(handle, dir);
+
+ end_rmdir:
+@@ -852,8 +1950,9 @@
+ handle_t *handle;
+
+ handle = ext3_journal_start(dir, EXT3_DELETE_TRANS_BLOCKS);
+- if (IS_ERR(handle))
++ if (IS_ERR(handle)) {
+ return PTR_ERR(handle);
++ }
+
+ if (IS_SYNC(dir))
+ handle->h_sync = 1;
+@@ -880,7 +1979,7 @@
+ if (retval)
+ goto end_unlink;
+ dir->i_ctime = dir->i_mtime = CURRENT_TIME;
+- dir->u.ext3_i.i_flags &= ~EXT3_INDEX_FL;
++ ext3_update_dx_flag(dir);
+ ext3_mark_inode_dirty(handle, dir);
+ inode->i_nlink--;
+ if (!inode->i_nlink)
+@@ -906,9 +2005,11 @@
+ if (l > dir->i_sb->s_blocksize)
+ return -ENAMETOOLONG;
+
+- handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS + 5);
+- if (IS_ERR(handle))
++ handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS +
++ EXT3_INDEX_EXTRA_TRANS_BLOCKS + 5);
++ if (IS_ERR(handle)) {
+ return PTR_ERR(handle);
++ }
+
+ if (IS_SYNC(dir))
+ handle->h_sync = 1;
+@@ -918,7 +2019,7 @@
+ if (IS_ERR(inode))
+ goto out_stop;
+
+- if (l > sizeof (inode->u.ext3_i.i_data)) {
++ if (l > sizeof (EXT3_I(inode)->i_data)) {
+ inode->i_op = &ext3_symlink_inode_operations;
+ inode->i_mapping->a_ops = &ext3_aops;
+ /*
+@@ -927,24 +2028,22 @@
+ * i_size in generic_commit_write().
+ */
+ err = block_symlink(inode, symname, l);
+- if (err)
+- goto out_no_entry;
++ if (err) {
++ ext3_dec_count(handle, inode);
++ ext3_mark_inode_dirty(handle, inode);
++ iput (inode);
++ goto out_stop;
++ }
+ } else {
+ inode->i_op = &ext3_fast_symlink_inode_operations;
+- memcpy((char*)&inode->u.ext3_i.i_data,symname,l);
++ memcpy((char*)&EXT3_I(inode)->i_data,symname,l);
+ inode->i_size = l-1;
+ }
+- inode->u.ext3_i.i_disksize = inode->i_size;
++ EXT3_I(inode)->i_disksize = inode->i_size;
+ err = ext3_add_nondir(handle, dentry, inode);
+ out_stop:
+ ext3_journal_stop(handle, dir);
+ return err;
+-
+-out_no_entry:
+- ext3_dec_count(handle, inode);
+- ext3_mark_inode_dirty(handle, inode);
+- iput (inode);
+- goto out_stop;
+ }
+
+ static int ext3_link (struct dentry * old_dentry,
+@@ -957,12 +2056,15 @@
+ if (S_ISDIR(inode->i_mode))
+ return -EPERM;
+
+- if (inode->i_nlink >= EXT3_LINK_MAX)
++ if (inode->i_nlink >= EXT3_LINK_MAX) {
+ return -EMLINK;
++ }
+
+- handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS);
+- if (IS_ERR(handle))
++ handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS +
++ EXT3_INDEX_EXTRA_TRANS_BLOCKS);
++ if (IS_ERR(handle)) {
+ return PTR_ERR(handle);
++ }
+
+ if (IS_SYNC(dir))
+ handle->h_sync = 1;
+@@ -995,9 +2097,11 @@
+
+ old_bh = new_bh = dir_bh = NULL;
+
+- handle = ext3_journal_start(old_dir, 2 * EXT3_DATA_TRANS_BLOCKS + 2);
+- if (IS_ERR(handle))
++ handle = ext3_journal_start(old_dir, 2 * EXT3_DATA_TRANS_BLOCKS +
++ EXT3_INDEX_EXTRA_TRANS_BLOCKS + 2);
++ if (IS_ERR(handle)) {
+ return PTR_ERR(handle);
++ }
+
+ if (IS_SYNC(old_dir) || IS_SYNC(new_dir))
+ handle->h_sync = 1;
+@@ -1070,14 +2174,37 @@
+ /*
+ * ok, that's it
+ */
+- ext3_delete_entry(handle, old_dir, old_de, old_bh);
++ if (le32_to_cpu(old_de->inode) != old_inode->i_ino ||
++ old_de->name_len != old_dentry->d_name.len ||
++ strncmp(old_de->name, old_dentry->d_name.name, old_de->name_len) ||
++ (retval = ext3_delete_entry(handle, old_dir,
++ old_de, old_bh)) == -ENOENT) {
++ /* old_de could have moved from under us during htree split, so
++ * make sure that we are deleting the right entry. We might
++ * also be pointing to a stale entry in the unused part of
++ * old_bh so just checking inum and the name isn't enough. */
++ struct buffer_head *old_bh2;
++ struct ext3_dir_entry_2 *old_de2;
++
++ old_bh2 = ext3_find_entry(old_dentry, &old_de2);
++ if (old_bh2) {
++ retval = ext3_delete_entry(handle, old_dir,
++ old_de2, old_bh2);
++ brelse(old_bh2);
++ }
++ }
++ if (retval) {
++ ext3_warning(old_dir->i_sb, "ext3_rename",
++ "Deleting old file (%lu), %d, error=%d",
++ old_dir->i_ino, old_dir->i_nlink, retval);
++ }
+
+ if (new_inode) {
+ new_inode->i_nlink--;
+ new_inode->i_ctime = CURRENT_TIME;
+ }
+ old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
+- old_dir->u.ext3_i.i_flags &= ~EXT3_INDEX_FL;
++ ext3_update_dx_flag(old_dir);
+ if (dir_bh) {
+ BUFFER_TRACE(dir_bh, "get_write_access");
+ ext3_journal_get_write_access(handle, dir_bh);
+@@ -1089,7 +2216,7 @@
+ new_inode->i_nlink--;
+ } else {
+ new_dir->i_nlink++;
+- new_dir->u.ext3_i.i_flags &= ~EXT3_INDEX_FL;
++ ext3_update_dx_flag(new_dir);
+ ext3_mark_inode_dirty(handle, new_dir);
+ }
+ }
+Index: linux-2.4.21/fs/ext3/super.c
+===================================================================
+--- linux-2.4.21.orig/fs/ext3/super.c 2004-09-16 19:21:00.000000000 -0400
++++ linux-2.4.21/fs/ext3/super.c 2004-09-16 19:40:16.000000000 -0400
+@@ -777,6 +777,7 @@
+ es->s_mtime = cpu_to_le32(CURRENT_TIME);
+ ext3_update_dynamic_rev(sb);
+ EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
++
+ ext3_commit_super (sb, es, 1);
+ if (test_opt (sb, DEBUG))
+ printk (KERN_INFO
+@@ -787,6 +788,7 @@
+ EXT3_BLOCKS_PER_GROUP(sb),
+ EXT3_INODES_PER_GROUP(sb),
+ sbi->s_mount_opt);
++
+ printk(KERN_INFO "EXT3 FS " EXT3FS_VERSION ", " EXT3FS_DATE " on %s, ",
+ bdevname(sb->s_dev));
+ if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
+@@ -960,6 +962,7 @@
+ return res;
+ }
+
++
+ struct super_block * ext3_read_super (struct super_block * sb, void * data,
+ int silent)
+ {
+@@ -1146,6 +1149,9 @@
+ sbi->s_mount_state = le16_to_cpu(es->s_state);
+ sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
+ sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
++ for (i=0; i < 4; i++)
++ sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
++ sbi->s_def_hash_version = es->s_def_hash_version;
+
+ if (sbi->s_blocks_per_group > blocksize * 8) {
+ printk (KERN_ERR
+@@ -1938,6 +1944,7 @@
+ unregister_filesystem(&ext3_fs_type);
+ }
+
++EXPORT_SYMBOL(ext3_force_commit);
+ EXPORT_SYMBOL(ext3_bread);
+
+ MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
+Index: linux-2.4.21/include/linux/ext3_fs.h
+===================================================================
+--- linux-2.4.21.orig/include/linux/ext3_fs.h 2004-09-11 10:16:28.000000000 -0400
++++ linux-2.4.21/include/linux/ext3_fs.h 2004-09-16 19:40:16.000000000 -0400
+@@ -40,6 +40,11 @@
+ #define EXT3FS_VERSION "2.4-0.9.19"
+
+ /*
++ * Always enable hashed directories
++ */
++#define CONFIG_EXT3_INDEX
++
++/*
+ * Debug code
+ */
+ #ifdef EXT3FS_DEBUG
+@@ -415,8 +420,11 @@
+ /*E0*/ __u32 s_journal_inum; /* inode number of journal file */
+ __u32 s_journal_dev; /* device number of journal file */
+ __u32 s_last_orphan; /* start of list of inodes to delete */
+-
+-/*EC*/ __u32 s_reserved[197]; /* Padding to the end of the block */
++ __u32 s_hash_seed[4]; /* HTREE hash seed */
++ __u8 s_def_hash_version; /* Default hash version to use */
++ __u8 s_reserved_char_pad;
++ __u16 s_reserved_word_pad;
++ __u32 s_reserved[192]; /* Padding to the end of the block */
+ };
+
+ #ifdef __KERNEL__
+@@ -553,9 +561,46 @@
+ #define EXT3_DIR_ROUND (EXT3_DIR_PAD - 1)
+ #define EXT3_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT3_DIR_ROUND) & \
+ ~EXT3_DIR_ROUND)
++/*
++ * Hash Tree Directory indexing
++ * (c) Daniel Phillips, 2001
++ */
++
++#ifdef CONFIG_EXT3_INDEX
++ #define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \
++ EXT3_FEATURE_COMPAT_DIR_INDEX) && \
++ (EXT3_I(dir)->i_flags & EXT3_INDEX_FL))
++#define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)
++#define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
++#else
++ #define is_dx(dir) 0
++#define EXT3_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT3_LINK_MAX)
++#define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
++#endif
++
++/* Legal values for the dx_root hash_version field: */
++
++#define DX_HASH_LEGACY 0
++#define DX_HASH_HALF_MD4 1
++#define DX_HASH_TEA 2
++
++/* hash info structure used by the directory hash */
++struct dx_hash_info
++{
++ u32 hash;
++ u32 minor_hash;
++ int hash_version;
++ u32 *seed;
++};
+
+ #ifdef __KERNEL__
+ /*
++ * Control parameters used by ext3_htree_next_block
++ */
++#define HASH_NB_ALWAYS 1
++
++
++/*
+ * Describe an inode's exact location on disk and in memory
+ */
+ struct ext3_iloc
+@@ -565,6 +610,27 @@
+ unsigned long block_group;
+ };
+
++
++/*
++ * This structure is stuffed into the struct file's private_data field
++ * for directories. It is where we put information so that we can do
++ * readdir operations in hash tree order.
++ */
++struct dir_private_info {
++ rb_root_t root;
++ rb_node_t *curr_node;
++ struct fname *extra_fname;
++ loff_t last_pos;
++ __u32 curr_hash;
++ __u32 curr_minor_hash;
++ __u32 next_hash;
++};
++
++/*
++ * Special error return code only used by dx_probe() and its callers.
++ */
++#define ERR_BAD_DX_DIR -75000
++
+ /*
+ * Function prototypes
+ */
+@@ -592,11 +658,20 @@
+
+ /* dir.c */
+ extern int ext3_check_dir_entry(const char *, struct inode *,
+- struct ext3_dir_entry_2 *, struct buffer_head *,
+- unsigned long);
++ struct ext3_dir_entry_2 *,
++ struct buffer_head *, unsigned long);
++extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
++ __u32 minor_hash,
++ struct ext3_dir_entry_2 *dirent);
++extern void ext3_htree_free_dir_info(struct dir_private_info *p);
++
+ /* fsync.c */
+ extern int ext3_sync_file (struct file *, struct dentry *, int);
+
++/* hash.c */
++extern int ext3fs_dirhash(const char *name, int len, struct
++ dx_hash_info *hinfo);
++
+ /* ialloc.c */
+ extern struct inode * ext3_new_inode (handle_t *, struct inode *, int);
+ extern void ext3_free_inode (handle_t *, struct inode *);
+@@ -630,6 +705,8 @@
+ /* namei.c */
+ extern int ext3_orphan_add(handle_t *, struct inode *);
+ extern int ext3_orphan_del(handle_t *, struct inode *);
++extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
++ __u32 start_minor_hash, __u32 *next_hash);
+
+ /* super.c */
+ extern void ext3_error (struct super_block *, const char *, const char *, ...)
+Index: linux-2.4.21/include/linux/ext3_fs_sb.h
+===================================================================
+--- linux-2.4.21.orig/include/linux/ext3_fs_sb.h 2004-09-11 10:16:39.000000000 -0400
++++ linux-2.4.21/include/linux/ext3_fs_sb.h 2004-09-16 19:40:16.000000000 -0400
+@@ -62,6 +62,8 @@
+ int s_inode_size;
+ int s_first_ino;
+ u32 s_next_generation;
++ u32 s_hash_seed[4];
++ int s_def_hash_version;
+
+ /* Journaling */
+ struct inode * s_journal_inode;
+Index: linux-2.4.21/include/linux/ext3_jbd.h
+===================================================================
+--- linux-2.4.21.orig/include/linux/ext3_jbd.h 2004-09-11 10:16:39.000000000 -0400
++++ linux-2.4.21/include/linux/ext3_jbd.h 2004-09-16 19:40:16.000000000 -0400
+@@ -69,6 +69,8 @@
+
+ #define EXT3_RESERVE_TRANS_BLOCKS 12U
+
++#define EXT3_INDEX_EXTRA_TRANS_BLOCKS 8
++
+ int
+ ext3_mark_iloc_dirty(handle_t *handle,
+ struct inode *inode,
+Index: linux-2.4.21/lib/rbtree.c
+===================================================================
+--- linux-2.4.21.orig/lib/rbtree.c 2004-09-11 10:16:18.000000000 -0400
++++ linux-2.4.21/lib/rbtree.c 2004-09-16 19:40:16.000000000 -0400
+@@ -17,6 +17,8 @@
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+ linux/lib/rbtree.c
++
++ rb_get_first and rb_get_next written by Theodore Ts'o, 9/8/2002
+ */
+
+ #include <linux/rbtree.h>
--- /dev/null
+ fs/dcache.c | 19 ++
+ fs/exec.c | 17 +-
+ fs/namei.c | 295 +++++++++++++++++++++++++++++++++++++++-------
+ fs/namespace.c | 28 +++-
+ fs/open.c | 172 +++++++++++++++++++-------
+ fs/stat.c | 52 +++++---
+ include/linux/dcache.h | 60 +++++++++
+ include/linux/fs.h | 32 ++++
+ include/linux/fs_struct.h | 4
+ kernel/exit.c | 3
+ kernel/fork.c | 3
+ kernel/ksyms.c | 1
+ 12 files changed, 558 insertions(+), 128 deletions(-)
+
+Index: linux-2.4.21/fs/dcache.c
+===================================================================
+--- linux-2.4.21.orig/fs/dcache.c 2004-09-11 10:16:31.000000000 -0400
++++ linux-2.4.21/fs/dcache.c 2004-09-16 19:32:11.000000000 -0400
+@@ -187,6 +187,13 @@
+ spin_unlock(&dcache_lock);
+ return 0;
+ }
++
++ /* network invalidation by Lustre */
++ if (dentry->d_flags & DCACHE_LUSTRE_INVALID) {
++ spin_unlock(&dcache_lock);
++ return 0;
++ }
++
+ /*
+ * Check whether to do a partial shrink_dcache
+ * to get rid of unused child entries.
+@@ -848,13 +855,19 @@
+ * Adds a dentry to the hash according to its name.
+ */
+
+-void d_rehash(struct dentry * entry)
++void __d_rehash(struct dentry * entry, int lock)
+ {
+ struct list_head *list = d_hash(entry->d_parent, entry->d_name.hash);
+ if (!list_empty(&entry->d_hash)) BUG();
+- spin_lock(&dcache_lock);
++ if (lock) spin_lock(&dcache_lock);
+ list_add(&entry->d_hash, list);
+- spin_unlock(&dcache_lock);
++ if (lock) spin_unlock(&dcache_lock);
++}
++EXPORT_SYMBOL(__d_rehash);
++
++void d_rehash(struct dentry * entry)
++{
++ __d_rehash(entry, 1);
+ }
+
+ #define do_switch(x,y) do { \
+Index: linux-2.4.21/fs/exec.c
+===================================================================
+--- linux-2.4.21.orig/fs/exec.c 2004-09-11 10:16:39.000000000 -0400
++++ linux-2.4.21/fs/exec.c 2004-09-16 19:32:11.000000000 -0400
+@@ -116,8 +116,10 @@
+ struct file * file;
+ struct nameidata nd;
+ int error;
++ struct lookup_intent it = { .it_op = IT_OPEN,
++ .it_flags = FMODE_READ|FMODE_EXEC };
+
+- error = user_path_walk(library, &nd);
++ error = user_path_walk_it(library, &nd, &it);
+ if (error)
+ goto out;
+
+@@ -129,7 +131,8 @@
+ if (error)
+ goto exit;
+
+- file = dentry_open(nd.dentry, nd.mnt, O_RDONLY);
++ file = dentry_open_it(nd.dentry, nd.mnt, O_RDONLY, &it);
++ intent_release(&it);
+ error = PTR_ERR(file);
+ if (IS_ERR(file))
+ goto out;
+@@ -401,8 +404,10 @@
+ struct inode *inode;
+ struct file *file;
+ int err = 0;
++ struct lookup_intent it = { .it_op = IT_OPEN,
++ .it_flags = FMODE_READ|FMODE_EXEC };
+
+- err = path_lookup(name, LOOKUP_FOLLOW|LOOKUP_POSITIVE, &nd);
++ err = path_lookup_it(name, LOOKUP_FOLLOW|LOOKUP_POSITIVE, &nd, &it);
+ file = ERR_PTR(err);
+ if (!err) {
+ inode = nd.dentry->d_inode;
+@@ -414,7 +419,8 @@
+ err = -EACCES;
+ file = ERR_PTR(err);
+ if (!err) {
+- file = dentry_open(nd.dentry, nd.mnt, O_RDONLY);
++ file = dentry_open_it(nd.dentry, nd.mnt, O_RDONLY, &it);
++ intent_release(&it);
+ if (!IS_ERR(file)) {
+ err = deny_write_access(file);
+ if (err) {
+@@ -426,6 +432,7 @@
+ return file;
+ }
+ }
++ intent_release(&it);
+ path_release(&nd);
+ }
+ goto out;
+@@ -1355,7 +1362,7 @@
+ goto close_fail;
+ if (!file->f_op->write)
+ goto close_fail;
+- if (do_truncate(file->f_dentry, 0) != 0)
++ if (do_truncate(file->f_dentry, 0, 0) != 0)
+ goto close_fail;
+
+ retval = binfmt->core_dump(signr, regs, file);
+Index: linux-2.4.21/fs/namei.c
+===================================================================
+--- linux-2.4.21.orig/fs/namei.c 2004-09-11 10:16:29.000000000 -0400
++++ linux-2.4.21/fs/namei.c 2004-09-16 19:34:57.000000000 -0400
+@@ -94,6 +94,13 @@
+ * XEmacs seems to be relying on it...
+ */
+
++void intent_release(struct lookup_intent *it)
++{
++ if (it && it->it_op_release)
++ it->it_op_release(it);
++
++}
++
+ /* In order to reduce some races, while at the same time doing additional
+ * checking and hopefully speeding things up, we copy filenames to the
+ * kernel data space before using them..
+@@ -260,10 +267,19 @@
+ * Internal lookup() using the new generic dcache.
+ * SMP-safe
+ */
+-static struct dentry * cached_lookup(struct dentry * parent, struct qstr * name, int flags)
++static struct dentry *cached_lookup(struct dentry *parent, struct qstr *name,
++ int flags, struct lookup_intent *it)
+ {
+ struct dentry * dentry = d_lookup(parent, name);
+
++ if (dentry && dentry->d_op && dentry->d_op->d_revalidate_it) {
++ if (!dentry->d_op->d_revalidate_it(dentry, flags, it) &&
++ !d_invalidate(dentry)) {
++ dput(dentry);
++ dentry = NULL;
++ }
++ return dentry;
++ } else
+ if (dentry && dentry->d_op && dentry->d_op->d_revalidate) {
+ if (!dentry->d_op->d_revalidate(dentry, flags) && !d_invalidate(dentry)) {
+ dput(dentry);
+@@ -281,11 +297,15 @@
+ * make sure that nobody added the entry to the dcache in the meantime..
+ * SMP-safe
+ */
+-static struct dentry * real_lookup(struct dentry * parent, struct qstr * name, int flags)
++static struct dentry *real_lookup(struct dentry *parent, struct qstr *name,
++ int flags, struct lookup_intent *it)
+ {
+ struct dentry * result;
+ struct inode *dir = parent->d_inode;
++ int counter = 0;
+
++again:
++ counter++;
+ down(&dir->i_sem);
+ /*
+ * First re-do the cached lookup just in case it was created
+@@ -300,6 +320,9 @@
+ result = ERR_PTR(-ENOMEM);
+ if (dentry) {
+ lock_kernel();
++ if (dir->i_op->lookup_it)
++ result = dir->i_op->lookup_it(dir, dentry, it, flags);
++ else
+ result = dir->i_op->lookup(dir, dentry);
+ unlock_kernel();
+ if (result)
+@@ -321,6 +344,15 @@
+ dput(result);
+ result = ERR_PTR(-ENOENT);
+ }
++ } else if (result->d_op && result->d_op->d_revalidate_it) {
++ if (!result->d_op->d_revalidate_it(result, flags, it) &&
++ !d_invalidate(result)) {
++ dput(result);
++ if (counter > 10)
++ result = ERR_PTR(-ESTALE);
++ if (!IS_ERR(result))
++ goto again;
++ }
+ }
+ return result;
+ }
+@@ -332,7 +364,8 @@
+ * Without that kind of total limit, nasty chains of consecutive
+ * symlinks can cause almost arbitrarily long lookups.
+ */
+-static inline int do_follow_link(struct dentry *dentry, struct nameidata *nd)
++static inline int do_follow_link(struct dentry *dentry, struct nameidata *nd,
++ struct lookup_intent *it)
+ {
+ int err;
+ if (current->link_count >= 8)
+@@ -346,10 +379,12 @@
+ current->link_count++;
+ current->total_link_count++;
+ UPDATE_ATIME(dentry->d_inode);
++ nd->intent = it;
+ err = dentry->d_inode->i_op->follow_link(dentry, nd);
+ current->link_count--;
+ return err;
+ loop:
++ intent_release(it);
+ path_release(nd);
+ return -ELOOP;
+ }
+@@ -447,7 +482,8 @@
+ *
+ * We expect 'base' to be positive and a directory.
+ */
+-int link_path_walk(const char * name, struct nameidata *nd)
++int link_path_walk_it(const char *name, struct nameidata *nd,
++ struct lookup_intent *it)
+ {
+ struct dentry *dentry;
+ struct inode *inode;
+@@ -524,12 +560,12 @@
+ break;
+ }
+ /* This does the actual lookups.. */
+- dentry = cached_lookup(nd->dentry, &this, LOOKUP_CONTINUE);
++ dentry = cached_lookup(nd->dentry, &this, LOOKUP_CONTINUE, NULL);
+ if (!dentry) {
+ err = -EWOULDBLOCKIO;
+ if (atomic)
+ break;
+- dentry = real_lookup(nd->dentry, &this, LOOKUP_CONTINUE);
++ dentry = real_lookup(nd->dentry, &this, LOOKUP_CONTINUE, NULL);
+ err = PTR_ERR(dentry);
+ if (IS_ERR(dentry))
+ break;
+@@ -547,7 +583,7 @@
+ goto out_dput;
+
+ if (inode->i_op->follow_link) {
+- err = do_follow_link(dentry, nd);
++ err = do_follow_link(dentry, nd, NULL);
+ dput(dentry);
+ if (err)
+ goto return_err;
+@@ -563,7 +599,7 @@
+ nd->dentry = dentry;
+ }
+ err = -ENOTDIR;
+- if (!inode->i_op->lookup)
++ if (!inode->i_op->lookup && !inode->i_op->lookup_it)
+ break;
+ continue;
+ /* here ends the main loop */
+@@ -590,12 +626,12 @@
+ if (err < 0)
+ break;
+ }
+- dentry = cached_lookup(nd->dentry, &this, nd->flags);
++ dentry = cached_lookup(nd->dentry, &this, nd->flags, it);
+ if (!dentry) {
+ err = -EWOULDBLOCKIO;
+ if (atomic)
+ break;
+- dentry = real_lookup(nd->dentry, &this, nd->flags);
++ dentry = real_lookup(nd->dentry, &this, nd->flags, it);
+ err = PTR_ERR(dentry);
+ if (IS_ERR(dentry))
+ break;
+@@ -605,7 +641,7 @@
+ inode = dentry->d_inode;
+ if ((lookup_flags & LOOKUP_FOLLOW)
+ && inode && inode->i_op && inode->i_op->follow_link) {
+- err = do_follow_link(dentry, nd);
++ err = do_follow_link(dentry, nd, it);
+ dput(dentry);
+ if (err)
+ goto return_err;
+@@ -619,7 +655,8 @@
+ goto no_inode;
+ if (lookup_flags & LOOKUP_DIRECTORY) {
+ err = -ENOTDIR;
+- if (!inode->i_op || !inode->i_op->lookup)
++ if (!inode->i_op ||
++ (!inode->i_op->lookup && !inode->i_op->lookup_it))
+ break;
+ }
+ goto return_base;
+@@ -643,6 +680,34 @@
+ * Check the cached dentry for staleness.
+ */
+ dentry = nd->dentry;
++ if (dentry && dentry->d_op && dentry->d_op->d_revalidate_it) {
++ err = -ESTALE;
++ if (!dentry->d_op->d_revalidate_it(dentry, 0, it)) {
++ struct dentry *new;
++ err = permission(dentry->d_parent->d_inode,
++ MAY_EXEC);
++ if (err)
++ break;
++ new = real_lookup(dentry->d_parent,
++ &dentry->d_name, 0, it);
++ if (IS_ERR(new)) {
++ err = PTR_ERR(new);
++ break;
++ }
++ d_invalidate(dentry);
++ dput(dentry);
++ nd->dentry = new;
++ }
++ if (!nd->dentry->d_inode)
++ goto no_inode;
++ if (lookup_flags & LOOKUP_DIRECTORY) {
++ err = -ENOTDIR;
++ if (!nd->dentry->d_inode->i_op ||
++ (!nd->dentry->d_inode->i_op->lookup &&
++ !nd->dentry->d_inode->i_op->lookup_it))
++ break;
++ }
++ } else
+ if (dentry && dentry->d_op && dentry->d_op->d_revalidate) {
+ err = -ESTALE;
+ if (!dentry->d_op->d_revalidate(dentry, 0)) {
+@@ -656,15 +721,28 @@
+ dput(dentry);
+ break;
+ }
++ if (err)
++ intent_release(it);
+ path_release(nd);
+ return_err:
+ return err;
+ }
+
++int link_path_walk(const char * name, struct nameidata *nd)
++{
++ return link_path_walk_it(name, nd, NULL);
++}
++
++int path_walk_it(const char * name, struct nameidata *nd, struct lookup_intent *it)
++{
++ current->total_link_count = 0;
++ return link_path_walk_it(name, nd, it);
++}
++
+ int path_walk(const char * name, struct nameidata *nd)
+ {
+ current->total_link_count = 0;
+- return link_path_walk(name, nd);
++ return link_path_walk_it(name, nd, NULL);
+ }
+
+ /* SMP-safe */
+@@ -749,6 +827,17 @@
+ }
+
+ /* SMP-safe */
++int path_lookup_it(const char *path, unsigned flags, struct nameidata *nd,
++ struct lookup_intent *it)
++{
++ int error = 0;
++ if (path_init(path, flags, nd))
++ error = path_walk_it(path, nd, it);
++ return error;
++}
++
++
++/* SMP-safe */
+ int path_lookup(const char *path, unsigned flags, struct nameidata *nd)
+ {
+ int error = 0;
+@@ -763,6 +852,7 @@
+ {
+ nd->last_type = LAST_ROOT; /* if there are only slashes... */
+ nd->flags = flags;
++ nd->intent = NULL;
+ if (*name=='/')
+ return walk_init_root(name,nd);
+ read_lock(¤t->fs->lock);
+@@ -777,7 +867,8 @@
+ * needs parent already locked. Doesn't follow mounts.
+ * SMP-safe.
+ */
+-struct dentry * lookup_hash(struct qstr *name, struct dentry * base)
++struct dentry * lookup_hash_it(struct qstr *name, struct dentry * base,
++ struct lookup_intent *it)
+ {
+ struct dentry * dentry;
+ struct inode *inode;
+@@ -800,13 +891,16 @@
+ goto out;
+ }
+
+- dentry = cached_lookup(base, name, 0);
++ dentry = cached_lookup(base, name, 0, it);
+ if (!dentry) {
+ struct dentry *new = d_alloc(base, name);
+ dentry = ERR_PTR(-ENOMEM);
+ if (!new)
+ goto out;
+ lock_kernel();
++ if (inode->i_op->lookup_it)
++ dentry = inode->i_op->lookup_it(inode, new, it, 0);
++ else
+ dentry = inode->i_op->lookup(inode, new);
+ unlock_kernel();
+ if (!dentry)
+@@ -818,6 +912,12 @@
+ return dentry;
+ }
+
++struct dentry * lookup_hash(struct qstr *name, struct dentry * base)
++{
++ return lookup_hash_it(name, base, NULL);
++}
++
++
+ /* SMP-safe */
+ struct dentry * lookup_one_len(const char * name, struct dentry * base, int len)
+ {
+@@ -839,7 +939,7 @@
+ }
+ this.hash = end_name_hash(hash);
+
+- return lookup_hash(&this, base);
++ return lookup_hash_it(&this, base, NULL);
+ access:
+ return ERR_PTR(-EACCES);
+ }
+@@ -870,6 +970,23 @@
+ return err;
+ }
+
++int __user_walk_it(const char *name, unsigned flags, struct nameidata *nd,
++ struct lookup_intent *it)
++{
++ char *tmp;
++ int err;
++
++ tmp = getname(name);
++ err = PTR_ERR(tmp);
++ if (!IS_ERR(tmp)) {
++ err = 0;
++ if (path_init(tmp, flags, nd))
++ err = path_walk_it(tmp, nd, it);
++ putname(tmp);
++ }
++ return err;
++}
++
+ /*
+ * It's inline, so penalty for filesystems that don't use sticky bit is
+ * minimal.
+@@ -967,7 +1084,8 @@
+ return retval;
+ }
+
+-int vfs_create(struct inode *dir, struct dentry *dentry, int mode)
++static int vfs_create_it(struct inode *dir, struct dentry *dentry, int mode,
++ struct lookup_intent *it)
+ {
+ int error;
+
+@@ -980,12 +1098,15 @@
+ goto exit_lock;
+
+ error = -EACCES; /* shouldn't it be ENOSYS? */
+- if (!dir->i_op || !dir->i_op->create)
++ if (!dir->i_op || (!dir->i_op->create && !dir->i_op->create_it))
+ goto exit_lock;
+
+ DQUOT_INIT(dir);
+ lock_kernel();
+- error = dir->i_op->create(dir, dentry, mode);
++ if (dir->i_op->create_it)
++ error = dir->i_op->create_it(dir, dentry, mode, it);
++ else
++ error = dir->i_op->create(dir, dentry, mode);
+ unlock_kernel();
+ exit_lock:
+ up(&dir->i_zombie);
+@@ -994,6 +1115,11 @@
+ return error;
+ }
+
++int vfs_create(struct inode *dir, struct dentry *dentry, int mode)
++{
++ return vfs_create_it(dir, dentry, mode, NULL);
++}
++
+ /*
+ * open_namei()
+ *
+@@ -1008,7 +1134,8 @@
+ * for symlinks (where the permissions are checked later).
+ * SMP-safe
+ */
+-int open_namei(const char * pathname, int flag, int mode, struct nameidata *nd)
++int open_namei_it(const char *pathname, int flag, int mode,
++ struct nameidata *nd, struct lookup_intent *it)
+ {
+ int acc_mode, error = 0;
+ struct inode *inode;
+@@ -1018,11 +1145,14 @@
+
+ acc_mode = ACC_MODE(flag);
+
++ if (it)
++ it->it_flags = flag;
++
+ /*
+ * The simplest case - just a plain lookup.
+ */
+ if (!(flag & O_CREAT)) {
+- error = path_lookup(pathname, lookup_flags(flag), nd);
++ error = path_lookup_it(pathname, lookup_flags(flag), nd, it);
+ if (error)
+ return error;
+ dentry = nd->dentry;
+@@ -1032,6 +1162,10 @@
+ /*
+ * Create - we need to know the parent.
+ */
++ if (it) {
++ it->it_create_mode = mode;
++ it->it_op |= IT_CREAT;
++ }
+ error = path_lookup(pathname, LOOKUP_PARENT, nd);
+ if (error)
+ return error;
+@@ -1047,7 +1181,7 @@
+
+ dir = nd->dentry;
+ down(&dir->d_inode->i_sem);
+- dentry = lookup_hash(&nd->last, nd->dentry);
++ dentry = lookup_hash_it(&nd->last, nd->dentry, it);
+
+ do_last:
+ error = PTR_ERR(dentry);
+@@ -1056,11 +1190,12 @@
+ goto exit;
+ }
+
++ it->it_create_mode = mode;
+ /* Negative dentry, just create the file */
+ if (!dentry->d_inode) {
+ if (!IS_POSIXACL(dir->d_inode))
+ mode &= ~current->fs->umask;
+- error = vfs_create(dir->d_inode, dentry, mode);
++ error = vfs_create_it(dir->d_inode, dentry, mode, it);
+ up(&dir->d_inode->i_sem);
+ dput(nd->dentry);
+ nd->dentry = dentry;
+@@ -1164,7 +1299,7 @@
+ if (!error) {
+ DQUOT_INIT(inode);
+
+- error = do_truncate(dentry, 0);
++ error = do_truncate(dentry, 0, 1);
+ }
+ put_write_access(inode);
+ if (error)
+@@ -1176,8 +1311,10 @@
+ return 0;
+
+ exit_dput:
++ intent_release(it);
+ dput(dentry);
+ exit:
++ intent_release(it);
+ path_release(nd);
+ return error;
+
+@@ -1196,7 +1333,10 @@
+ * are done. Procfs-like symlinks just set LAST_BIND.
+ */
+ UPDATE_ATIME(dentry->d_inode);
++ nd->intent = it;
+ error = dentry->d_inode->i_op->follow_link(dentry, nd);
++ if (error)
++ intent_release(it);
+ dput(dentry);
+ if (error)
+ return error;
+@@ -1218,13 +1358,20 @@
+ }
+ dir = nd->dentry;
+ down(&dir->d_inode->i_sem);
+- dentry = lookup_hash(&nd->last, nd->dentry);
++ dentry = lookup_hash_it(&nd->last, nd->dentry, it);
+ putname(nd->last.name);
+ goto do_last;
+ }
+
++int open_namei(const char *pathname, int flag, int mode, struct nameidata *nd)
++{
++ return open_namei_it(pathname, flag, mode, nd, NULL);
++}
++
++
+ /* SMP-safe */
+-static struct dentry *lookup_create(struct nameidata *nd, int is_dir)
++static struct dentry *lookup_create(struct nameidata *nd, int is_dir,
++ struct lookup_intent *it)
+ {
+ struct dentry *dentry;
+
+@@ -1232,7 +1379,7 @@
+ dentry = ERR_PTR(-EEXIST);
+ if (nd->last_type != LAST_NORM)
+ goto fail;
+- dentry = lookup_hash(&nd->last, nd->dentry);
++ dentry = lookup_hash_it(&nd->last, nd->dentry, it);
+ if (IS_ERR(dentry))
+ goto fail;
+ if (!is_dir && nd->last.name[nd->last.len] && !dentry->d_inode)
+@@ -1288,7 +1435,20 @@
+ error = path_lookup(tmp, LOOKUP_PARENT, &nd);
+ if (error)
+ goto out;
+- dentry = lookup_create(&nd, 0);
++
++ if (nd.last_type != LAST_NORM) {
++ error = -EEXIST;
++ goto out2;
++ }
++ if (nd.dentry->d_inode->i_op->mknod_raw) {
++ struct inode_operations *op = nd.dentry->d_inode->i_op;
++ error = op->mknod_raw(&nd, mode, dev);
++ /* the file system wants to use normal vfs path now */
++ if (error != -EOPNOTSUPP)
++ goto out2;
++ }
++
++ dentry = lookup_create(&nd, 0, NULL);
+ error = PTR_ERR(dentry);
+
+ if (!IS_POSIXACL(nd.dentry->d_inode))
+@@ -1310,6 +1470,7 @@
+ dput(dentry);
+ }
+ up(&nd.dentry->d_inode->i_sem);
++out2:
+ path_release(&nd);
+ out:
+ putname(tmp);
+@@ -1357,7 +1518,18 @@
+ error = path_lookup(tmp, LOOKUP_PARENT, &nd);
+ if (error)
+ goto out;
+- dentry = lookup_create(&nd, 1);
++ if (nd.last_type != LAST_NORM) {
++ error = -EEXIST;
++ goto out2;
++ }
++ if (nd.dentry->d_inode->i_op->mkdir_raw) {
++ struct inode_operations *op = nd.dentry->d_inode->i_op;
++ error = op->mkdir_raw(&nd, mode);
++ /* the file system wants to use normal vfs path now */
++ if (error != -EOPNOTSUPP)
++ goto out2;
++ }
++ dentry = lookup_create(&nd, 1, NULL);
+ error = PTR_ERR(dentry);
+ if (!IS_ERR(dentry)) {
+ if (!IS_POSIXACL(nd.dentry->d_inode))
+@@ -1366,6 +1538,7 @@
+ dput(dentry);
+ }
+ up(&nd.dentry->d_inode->i_sem);
++out2:
+ path_release(&nd);
+ out:
+ putname(tmp);
+@@ -1466,8 +1639,16 @@
+ error = -EBUSY;
+ goto exit1;
+ }
++ if (nd.dentry->d_inode->i_op->rmdir_raw) {
++ struct inode_operations *op = nd.dentry->d_inode->i_op;
++
++ error = op->rmdir_raw(&nd);
++ /* the file system wants to use normal vfs path now */
++ if (error != -EOPNOTSUPP)
++ goto exit1;
++ }
+ down(&nd.dentry->d_inode->i_sem);
+- dentry = lookup_hash(&nd.last, nd.dentry);
++ dentry = lookup_hash_it(&nd.last, nd.dentry, NULL);
+ error = PTR_ERR(dentry);
+ if (!IS_ERR(dentry)) {
+ error = vfs_rmdir(nd.dentry->d_inode, dentry);
+@@ -1525,8 +1706,15 @@
+ error = -EISDIR;
+ if (nd.last_type != LAST_NORM)
+ goto exit1;
++ if (nd.dentry->d_inode->i_op->unlink_raw) {
++ struct inode_operations *op = nd.dentry->d_inode->i_op;
++ error = op->unlink_raw(&nd);
++ /* the file system wants to use normal vfs path now */
++ if (error != -EOPNOTSUPP)
++ goto exit1;
++ }
+ down(&nd.dentry->d_inode->i_sem);
+- dentry = lookup_hash(&nd.last, nd.dentry);
++ dentry = lookup_hash_it(&nd.last, nd.dentry, NULL);
+ error = PTR_ERR(dentry);
+ if (!IS_ERR(dentry)) {
+ /* Why not before? Because we want correct error value */
+@@ -1593,15 +1781,27 @@
+ error = path_lookup(to, LOOKUP_PARENT, &nd);
+ if (error)
+ goto out;
+- dentry = lookup_create(&nd, 0);
++ if (nd.last_type != LAST_NORM) {
++ error = -EEXIST;
++ goto out2;
++ }
++ if (nd.dentry->d_inode->i_op->symlink_raw) {
++ struct inode_operations *op = nd.dentry->d_inode->i_op;
++ error = op->symlink_raw(&nd, from);
++ /* the file system wants to use normal vfs path now */
++ if (error != -EOPNOTSUPP)
++ goto out2;
++ }
++ dentry = lookup_create(&nd, 0, NULL);
+ error = PTR_ERR(dentry);
+ if (!IS_ERR(dentry)) {
+ error = vfs_symlink(nd.dentry->d_inode, dentry, from);
+ dput(dentry);
+ }
+ up(&nd.dentry->d_inode->i_sem);
++ out2:
+ path_release(&nd);
+-out:
++ out:
+ putname(to);
+ }
+ putname(from);
+@@ -1677,7 +1877,18 @@
+ error = -EXDEV;
+ if (old_nd.mnt != nd.mnt)
+ goto out_release;
+- new_dentry = lookup_create(&nd, 0);
++ if (nd.last_type != LAST_NORM) {
++ error = -EEXIST;
++ goto out_release;
++ }
++ if (nd.dentry->d_inode->i_op->link_raw) {
++ struct inode_operations *op = nd.dentry->d_inode->i_op;
++ error = op->link_raw(&old_nd, &nd);
++ /* the file system wants to use normal vfs path now */
++ if (error != -EOPNOTSUPP)
++ goto out_release;
++ }
++ new_dentry = lookup_create(&nd, 0, NULL);
+ error = PTR_ERR(new_dentry);
+ if (!IS_ERR(new_dentry)) {
+ error = vfs_link(old_nd.dentry, nd.dentry->d_inode, new_dentry);
+@@ -1721,7 +1932,7 @@
+ * locking].
+ */
+ int vfs_rename_dir(struct inode *old_dir, struct dentry *old_dentry,
+- struct inode *new_dir, struct dentry *new_dentry)
++ struct inode *new_dir, struct dentry *new_dentry)
+ {
+ int error;
+ struct inode *target;
+@@ -1800,7 +2011,7 @@
+ }
+
+ int vfs_rename_other(struct inode *old_dir, struct dentry *old_dentry,
+- struct inode *new_dir, struct dentry *new_dentry)
++ struct inode *new_dir, struct dentry *new_dentry)
+ {
+ int error;
+
+@@ -1888,9 +2099,18 @@
+ if (newnd.last_type != LAST_NORM)
+ goto exit2;
+
++ if (old_dir->d_inode->i_op->rename_raw) {
++ lock_kernel();
++ error = old_dir->d_inode->i_op->rename_raw(&oldnd, &newnd);
++ unlock_kernel();
++ /* the file system wants to use normal vfs path now */
++ if (error != -EOPNOTSUPP)
++ goto exit2;
++ }
++
+ double_lock(new_dir, old_dir);
+
+- old_dentry = lookup_hash(&oldnd.last, old_dir);
++ old_dentry = lookup_hash_it(&oldnd.last, old_dir, NULL);
+ error = PTR_ERR(old_dentry);
+ if (IS_ERR(old_dentry))
+ goto exit3;
+@@ -1906,16 +2126,16 @@
+ if (newnd.last.name[newnd.last.len])
+ goto exit4;
+ }
+- new_dentry = lookup_hash(&newnd.last, new_dir);
++ new_dentry = lookup_hash_it(&newnd.last, new_dir, NULL);
+ error = PTR_ERR(new_dentry);
+ if (IS_ERR(new_dentry))
+ goto exit4;
+
++
+ lock_kernel();
+ error = vfs_rename(old_dir->d_inode, old_dentry,
+ new_dir->d_inode, new_dentry);
+ unlock_kernel();
+-
+ dput(new_dentry);
+ exit4:
+ dput(old_dentry);
+@@ -1966,20 +2186,26 @@
+ }
+
+ static inline int
+-__vfs_follow_link(struct nameidata *nd, const char *link)
++__vfs_follow_link(struct nameidata *nd, const char *link,
++ struct lookup_intent *it)
+ {
+ int res = 0;
+ char *name;
+ if (IS_ERR(link))
+ goto fail;
+
++ if (it == NULL)
++ it = nd->intent;
++ else if (it != nd->intent)
++ printk("it != nd->intent: tell phil@clusterfs.com\n");
++
+ if (*link == '/') {
+ path_release(nd);
+ if (!walk_init_root(link, nd))
+ /* weird __emul_prefix() stuff did it */
+ goto out;
+ }
+- res = link_path_walk(link, nd);
++ res = link_path_walk_it(link, nd, it);
+ out:
+ if (current->link_count || res || nd->last_type!=LAST_NORM)
+ return res;
+@@ -2003,7 +2229,13 @@
+
+ int vfs_follow_link(struct nameidata *nd, const char *link)
+ {
+- return __vfs_follow_link(nd, link);
++ return __vfs_follow_link(nd, link, NULL);
++}
++
++int vfs_follow_link_it(struct nameidata *nd, const char *link,
++ struct lookup_intent *it)
++{
++ return __vfs_follow_link(nd, link, it);
+ }
+
+ /* get the link contents into pagecache */
+@@ -2045,7 +2277,7 @@
+ {
+ struct page *page = NULL;
+ char *s = page_getlink(dentry, &page);
+- int res = __vfs_follow_link(nd, s);
++ int res = __vfs_follow_link(nd, s, NULL);
+ if (page) {
+ kunmap(page);
+ page_cache_release(page);
+Index: linux-2.4.21/fs/namespace.c
+===================================================================
+--- linux-2.4.21.orig/fs/namespace.c 2004-09-11 10:16:15.000000000 -0400
++++ linux-2.4.21/fs/namespace.c 2004-09-16 19:32:11.000000000 -0400
+@@ -98,6 +98,7 @@
+ {
+ old_nd->dentry = mnt->mnt_mountpoint;
+ old_nd->mnt = mnt->mnt_parent;
++ UNPIN(old_nd->dentry, old_nd->mnt, 1);
+ mnt->mnt_parent = mnt;
+ mnt->mnt_mountpoint = mnt->mnt_root;
+ list_del_init(&mnt->mnt_child);
+@@ -109,6 +110,7 @@
+ {
+ mnt->mnt_parent = mntget(nd->mnt);
+ mnt->mnt_mountpoint = dget(nd->dentry);
++ PIN(nd->dentry, nd->mnt, 1);
+ list_add(&mnt->mnt_hash, mount_hashtable+hash(nd->mnt, nd->dentry));
+ list_add(&mnt->mnt_child, &nd->mnt->mnt_mounts);
+ nd->dentry->d_mounted++;
+@@ -488,14 +490,17 @@
+ {
+ struct nameidata old_nd;
+ struct vfsmount *mnt = NULL;
++ struct lookup_intent it = { .it_op = IT_GETATTR };
+ int err = mount_is_safe(nd);
+ if (err)
+ return err;
+ if (!old_name || !*old_name)
+ return -EINVAL;
+- err = path_lookup(old_name, LOOKUP_POSITIVE|LOOKUP_FOLLOW, &old_nd);
+- if (err)
++ err = path_lookup_it(old_name, LOOKUP_POSITIVE|LOOKUP_FOLLOW, &old_nd, &it);
++ if (err) {
++ intent_release(&it);
+ return err;
++ }
+
+ down_write(¤t->namespace->sem);
+ err = -EINVAL;
+@@ -518,6 +523,7 @@
+ }
+
+ up_write(¤t->namespace->sem);
++ intent_release(&it);
+ path_release(&old_nd);
+ return err;
+ }
+@@ -701,6 +707,7 @@
+ unsigned long flags, void *data_page)
+ {
+ struct nameidata nd;
++ struct lookup_intent it = { .it_op = IT_GETATTR };
+ int retval = 0;
+ int mnt_flags = 0;
+
+@@ -725,9 +732,11 @@
+ flags &= ~(MS_NOSUID|MS_NOEXEC|MS_NODEV);
+
+ /* ... and get the mountpoint */
+- retval = path_lookup(dir_name, LOOKUP_FOLLOW|LOOKUP_POSITIVE, &nd);
+- if (retval)
++ retval = path_lookup_it(dir_name, LOOKUP_FOLLOW|LOOKUP_POSITIVE, &nd, &it);
++ if (retval) {
++ intent_release(&it);
+ return retval;
++ }
+
+ if (flags & MS_REMOUNT)
+ retval = do_remount(&nd, flags & ~MS_REMOUNT, mnt_flags,
+@@ -739,6 +748,8 @@
+ else
+ retval = do_add_mount(&nd, type_page, flags, mnt_flags,
+ dev_name, data_page);
++
++ intent_release(&it);
+ path_release(&nd);
+ return retval;
+ }
+@@ -904,6 +915,8 @@
+ {
+ struct vfsmount *tmp;
+ struct nameidata new_nd, old_nd, parent_nd, root_parent, user_nd;
++ struct lookup_intent new_it = { .it_op = IT_GETATTR };
++ struct lookup_intent old_it = { .it_op = IT_GETATTR };
+ int error;
+
+ if (!capable(CAP_SYS_ADMIN))
+@@ -911,14 +924,14 @@
+
+ lock_kernel();
+
+- error = __user_walk(new_root, LOOKUP_POSITIVE|LOOKUP_FOLLOW|LOOKUP_DIRECTORY, &new_nd);
++ error = __user_walk_it(new_root, LOOKUP_POSITIVE|LOOKUP_FOLLOW|LOOKUP_DIRECTORY, &new_nd, &new_it);
+ if (error)
+ goto out0;
+ error = -EINVAL;
+ if (!check_mnt(new_nd.mnt))
+ goto out1;
+
+- error = __user_walk(put_old, LOOKUP_POSITIVE|LOOKUP_FOLLOW|LOOKUP_DIRECTORY, &old_nd);
++ error = __user_walk_it(put_old, LOOKUP_POSITIVE|LOOKUP_FOLLOW|LOOKUP_DIRECTORY, &old_nd, &old_it);
+ if (error)
+ goto out1;
+
+@@ -973,8 +986,10 @@
+ up(&old_nd.dentry->d_inode->i_zombie);
+ up_write(¤t->namespace->sem);
+ path_release(&user_nd);
++ intent_release(&old_it);
+ path_release(&old_nd);
+ out1:
++ intent_release(&new_it);
+ path_release(&new_nd);
+ out0:
+ unlock_kernel();
+Index: linux-2.4.21/fs/open.c
+===================================================================
+--- linux-2.4.21.orig/fs/open.c 2004-09-11 10:16:19.000000000 -0400
++++ linux-2.4.21/fs/open.c 2004-09-16 19:32:11.000000000 -0400
+@@ -19,6 +19,8 @@
+ #include <asm/uaccess.h>
+
+ #define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
++extern int path_walk_it(const char *name, struct nameidata *nd,
++ struct lookup_intent *it);
+
+ int vfs_statfs(struct super_block *sb, struct statfs *buf)
+ {
+@@ -95,9 +97,10 @@
+ write_unlock(&files->file_lock);
+ }
+
+-int do_truncate(struct dentry *dentry, loff_t length)
++int do_truncate(struct dentry *dentry, loff_t length, int called_from_open)
+ {
+ struct inode *inode = dentry->d_inode;
++ struct inode_operations *op = dentry->d_inode->i_op;
+ int error;
+ struct iattr newattrs;
+
+@@ -109,7 +112,13 @@
+ down(&inode->i_sem);
+ newattrs.ia_size = length;
+ newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
+- error = notify_change(dentry, &newattrs);
++ if (called_from_open)
++ newattrs.ia_valid |= ATTR_FROM_OPEN;
++ if (op->setattr_raw) {
++ newattrs.ia_valid |= ATTR_RAW;
++ error = op->setattr_raw(inode, &newattrs);
++ } else
++ error = notify_change(dentry, &newattrs);
+ up(&inode->i_sem);
+ up_write(&inode->i_alloc_sem);
+ return error;
+@@ -120,12 +129,13 @@
+ struct nameidata nd;
+ struct inode * inode;
+ int error;
++ struct lookup_intent it = { .it_op = IT_GETATTR };
+
+ error = -EINVAL;
+ if (length < 0) /* sorry, but loff_t says... */
+ goto out;
+
+- error = user_path_walk(path, &nd);
++ error = user_path_walk_it(path, &nd, &it);
+ if (error)
+ goto out;
+ inode = nd.dentry->d_inode;
+@@ -165,11 +175,13 @@
+ error = locks_verify_truncate(inode, NULL, length);
+ if (!error) {
+ DQUOT_INIT(inode);
+- error = do_truncate(nd.dentry, length);
++ intent_release(&it);
++ error = do_truncate(nd.dentry, length, 0);
+ }
+ put_write_access(inode);
+
+ dput_and_out:
++ intent_release(&it);
+ path_release(&nd);
+ out:
+ return error;
+@@ -217,7 +229,7 @@
+
+ error = locks_verify_truncate(inode, file, length);
+ if (!error)
+- error = do_truncate(dentry, length);
++ error = do_truncate(dentry, length, 0);
+ out_putf:
+ fput(file);
+ out:
+@@ -262,11 +274,13 @@
+ struct inode * inode;
+ struct iattr newattrs;
+
+- error = user_path_walk(filename, &nd);
++ error = user_path_walk_it(filename, &nd, NULL);
+ if (error)
+ goto out;
+ inode = nd.dentry->d_inode;
+
++ /* this is safe without a Lustre lock because it only depends
++ on the super block */
+ error = -EROFS;
+ if (IS_RDONLY(inode))
+ goto dput_and_out;
+@@ -281,11 +295,25 @@
+ goto dput_and_out;
+
+ newattrs.ia_valid |= ATTR_ATIME_SET | ATTR_MTIME_SET;
+- } else {
++ }
++
++ if (inode->i_op->setattr_raw) {
++ struct inode_operations *op = nd.dentry->d_inode->i_op;
++
++ newattrs.ia_valid |= ATTR_RAW;
++ error = op->setattr_raw(inode, &newattrs);
++ /* the file system wants to use normal vfs path now */
++ if (error != -EOPNOTSUPP)
++ goto dput_and_out;
++ }
++
++ error = -EPERM;
++ if (!times) {
+ if (current->fsuid != inode->i_uid &&
+ (error = permission(inode,MAY_WRITE)) != 0)
+ goto dput_and_out;
+ }
++
+ error = notify_change(nd.dentry, &newattrs);
+ dput_and_out:
+ path_release(&nd);
+@@ -306,12 +334,14 @@
+ struct inode * inode;
+ struct iattr newattrs;
+
+- error = user_path_walk(filename, &nd);
++ error = user_path_walk_it(filename, &nd, NULL);
+
+ if (error)
+ goto out;
+ inode = nd.dentry->d_inode;
+
++ /* this is safe without a Lustre lock because it only depends
++ on the super block */
+ error = -EROFS;
+ if (IS_RDONLY(inode))
+ goto dput_and_out;
+@@ -326,7 +356,20 @@
+ newattrs.ia_atime = times[0].tv_sec;
+ newattrs.ia_mtime = times[1].tv_sec;
+ newattrs.ia_valid |= ATTR_ATIME_SET | ATTR_MTIME_SET;
+- } else {
++ }
++
++ if (inode->i_op->setattr_raw) {
++ struct inode_operations *op = nd.dentry->d_inode->i_op;
++
++ newattrs.ia_valid |= ATTR_RAW;
++ error = op->setattr_raw(inode, &newattrs);
++ /* the file system wants to use normal vfs path now */
++ if (error != -EOPNOTSUPP)
++ goto dput_and_out;
++ }
++
++ error = -EPERM;
++ if (!utimes) {
+ if (current->fsuid != inode->i_uid &&
+ (error = permission(inode,MAY_WRITE)) != 0)
+ goto dput_and_out;
+@@ -349,6 +392,7 @@
+ int old_fsuid, old_fsgid;
+ kernel_cap_t old_cap;
+ int res;
++ struct lookup_intent it = { .it_op = IT_GETATTR };
+
+ if (mode & ~S_IRWXO) /* where's F_OK, X_OK, W_OK, R_OK? */
+ return -EINVAL;
+@@ -366,13 +410,14 @@
+ else
+ current->cap_effective = current->cap_permitted;
+
+- res = user_path_walk(filename, &nd);
++ res = user_path_walk_it(filename, &nd, &it);
+ if (!res) {
+ res = permission(nd.dentry->d_inode, mode);
+ /* SuS v2 requires we report a read only fs too */
+ if(!res && (mode & S_IWOTH) && IS_RDONLY(nd.dentry->d_inode)
+ && !special_file(nd.dentry->d_inode->i_mode))
+ res = -EROFS;
++ intent_release(&it);
+ path_release(&nd);
+ }
+
+@@ -387,8 +432,9 @@
+ {
+ int error;
+ struct nameidata nd;
++ struct lookup_intent it = { .it_op = IT_GETATTR };
+
+- error = __user_walk(filename,LOOKUP_POSITIVE|LOOKUP_FOLLOW|LOOKUP_DIRECTORY,&nd);
++ error = __user_walk_it(filename,LOOKUP_POSITIVE|LOOKUP_FOLLOW|LOOKUP_DIRECTORY,&nd, &it);
+ if (error)
+ goto out;
+
+@@ -399,6 +445,7 @@
+ set_fs_pwd(current->fs, nd.mnt, nd.dentry);
+
+ dput_and_out:
++ intent_release(&it);
+ path_release(&nd);
+ out:
+ return error;
+@@ -438,9 +485,10 @@
+ {
+ int error;
+ struct nameidata nd;
++ struct lookup_intent it = { .it_op = IT_GETATTR };
+
+- error = __user_walk(filename, LOOKUP_POSITIVE | LOOKUP_FOLLOW |
+- LOOKUP_DIRECTORY | LOOKUP_NOALT, &nd);
++ error = __user_walk_it(filename, LOOKUP_POSITIVE | LOOKUP_FOLLOW |
++ LOOKUP_DIRECTORY | LOOKUP_NOALT, &nd, &it);
+ if (error)
+ goto out;
+
+@@ -456,39 +504,56 @@
+ set_fs_altroot();
+ error = 0;
+ dput_and_out:
++ intent_release(&it);
+ path_release(&nd);
+ out:
+ return error;
+ }
+
+-asmlinkage long sys_fchmod(unsigned int fd, mode_t mode)
++int chmod_common(struct dentry *dentry, mode_t mode)
+ {
+- struct inode * inode;
+- struct dentry * dentry;
+- struct file * file;
+- int err = -EBADF;
++ struct inode *inode = dentry->d_inode;
+ struct iattr newattrs;
++ int err = -EROFS;
+
+- file = fget(fd);
+- if (!file)
++ if (IS_RDONLY(inode))
+ goto out;
+
+- dentry = file->f_dentry;
+- inode = dentry->d_inode;
++ if (inode->i_op->setattr_raw) {
++ newattrs.ia_mode = mode;
++ newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
++ newattrs.ia_valid |= ATTR_RAW;
++ err = inode->i_op->setattr_raw(inode, &newattrs);
++ /* the file system wants to use normal vfs path now */
++ if (err != -EOPNOTSUPP)
++ goto out;
++ }
+
+- err = -EROFS;
+- if (IS_RDONLY(inode))
+- goto out_putf;
+ err = -EPERM;
+ if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
+- goto out_putf;
++ goto out;
++
+ if (mode == (mode_t) -1)
+ mode = inode->i_mode;
+ newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
+ newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
+ err = notify_change(dentry, &newattrs);
+
+-out_putf:
++out:
++ return err;
++}
++
++asmlinkage long sys_fchmod(unsigned int fd, mode_t mode)
++{
++ struct file * file;
++ int err = -EBADF;
++
++ file = fget(fd);
++ if (!file)
++ goto out;
++
++ err = chmod_common(file->f_dentry, mode);
++
+ fput(file);
+ out:
+ return err;
+@@ -497,30 +562,14 @@
+ asmlinkage long sys_chmod(const char * filename, mode_t mode)
+ {
+ struct nameidata nd;
+- struct inode * inode;
+ int error;
+- struct iattr newattrs;
+
+ error = user_path_walk(filename, &nd);
+ if (error)
+ goto out;
+- inode = nd.dentry->d_inode;
+-
+- error = -EROFS;
+- if (IS_RDONLY(inode))
+- goto dput_and_out;
+
+- error = -EPERM;
+- if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
+- goto dput_and_out;
++ error = chmod_common(nd.dentry, mode);
+
+- if (mode == (mode_t) -1)
+- mode = inode->i_mode;
+- newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
+- newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
+- error = notify_change(nd.dentry, &newattrs);
+-
+-dput_and_out:
+ path_release(&nd);
+ out:
+ return error;
+@@ -540,6 +589,20 @@
+ error = -EROFS;
+ if (IS_RDONLY(inode))
+ goto out;
++
++ if (inode->i_op->setattr_raw) {
++ struct inode_operations *op = dentry->d_inode->i_op;
++
++ newattrs.ia_uid = user;
++ newattrs.ia_gid = group;
++ newattrs.ia_valid = ATTR_UID | ATTR_GID | ATTR_CTIME;
++ newattrs.ia_valid |= ATTR_RAW;
++ error = op->setattr_raw(inode, &newattrs);
++ /* the file system wants to use normal vfs path now */
++ if (error != -EOPNOTSUPP)
++ return error;
++ }
++
+ error = -EPERM;
+ if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
+ goto out;
+@@ -644,6 +707,7 @@
+ {
+ int namei_flags, error;
+ struct nameidata nd;
++ struct lookup_intent it = { .it_op = IT_OPEN };
+
+ namei_flags = flags;
+ if ((namei_flags+1) & O_ACCMODE)
+@@ -651,14 +715,15 @@
+ if (namei_flags & O_TRUNC)
+ namei_flags |= 2;
+
+- error = open_namei(filename, namei_flags, mode, &nd);
+- if (!error)
+- return dentry_open(nd.dentry, nd.mnt, flags);
++ error = open_namei_it(filename, namei_flags, mode, &nd, &it);
++ if (error)
++ return ERR_PTR(error);
+
+- return ERR_PTR(error);
++ return dentry_open_it(nd.dentry, nd.mnt, flags, &it);
+ }
+
+-struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags)
++struct file *dentry_open_it(struct dentry *dentry, struct vfsmount *mnt,
++ int flags, struct lookup_intent *it)
+ {
+ struct file * f;
+ struct inode *inode;
+@@ -695,7 +760,9 @@
+ }
+
+ if (f->f_op && f->f_op->open) {
++ f->f_it = it;
+ error = f->f_op->open(inode,f);
++ f->f_it = NULL;
+ if (error)
+ goto cleanup_all;
+ }
+@@ -711,6 +778,7 @@
+ }
+ }
+
++ intent_release(it);
+ return f;
+
+ cleanup_all:
+@@ -725,11 +793,17 @@
+ cleanup_file:
+ put_filp(f);
+ cleanup_dentry:
++ intent_release(it);
+ dput(dentry);
+ mntput(mnt);
+ return ERR_PTR(error);
+ }
+
++struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags)
++{
++ return dentry_open_it(dentry, mnt, flags, NULL);
++}
++
+ /*
+ * Find an empty file descriptor entry, and mark it busy.
+ */
+Index: linux-2.4.21/fs/stat.c
+===================================================================
+--- linux-2.4.21.orig/fs/stat.c 2004-09-11 10:16:30.000000000 -0400
++++ linux-2.4.21/fs/stat.c 2004-09-16 19:38:49.000000000 -0400
+@@ -17,10 +17,12 @@
+ * Revalidate the inode. This is required for proper NFS attribute caching.
+ */
+ static __inline__ int
+-do_revalidate(struct dentry *dentry)
++do_revalidate(struct dentry *dentry, struct lookup_intent *it)
+ {
+ struct inode * inode = dentry->d_inode;
+- if (inode->i_op && inode->i_op->revalidate)
++ if (inode->i_op && inode->i_op->revalidate_it)
++ return inode->i_op->revalidate_it(dentry, it);
++ else if (inode->i_op && inode->i_op->revalidate)
+ return inode->i_op->revalidate(dentry);
+ return 0;
+ }
+@@ -143,14 +145,16 @@
+ asmlinkage long sys_stat(char * filename, struct __old_kernel_stat * statbuf)
+ {
+ struct nameidata nd;
++ struct lookup_intent it = { .it_op = IT_GETATTR };
+ int error, errcnt = 0;
+
+ again:
+- error = user_path_walk(filename, &nd);
++ error = user_path_walk_it(filename, &nd, &it);
+ if (!error) {
+- error = do_revalidate(nd.dentry);
++ error = do_revalidate(nd.dentry, &it);
+ if (!error)
+ error = cp_old_stat(nd.dentry->d_inode, statbuf);
++ intent_release(&it);
+ path_release(&nd);
+ }
+ if (error == -ESTALE && !errcnt) {
+@@ -164,14 +168,16 @@
+ asmlinkage long sys_newstat(char * filename, struct stat * statbuf)
+ {
+ struct nameidata nd;
++ struct lookup_intent it = { .it_op = IT_GETATTR };
+ int error, errcnt = 0;
+
+ again:
+- error = user_path_walk(filename, &nd);
++ error = user_path_walk_it(filename, &nd, &it);
+ if (!error) {
+- error = do_revalidate(nd.dentry);
++ error = do_revalidate(nd.dentry, &it);
+ if (!error)
+ error = cp_new_stat(nd.dentry->d_inode, statbuf);
++ intent_release(&it);
+ path_release(&nd);
+ }
+ if (error == -ESTALE && !errcnt) {
+@@ -191,14 +197,16 @@
+ asmlinkage long sys_lstat(char * filename, struct __old_kernel_stat * statbuf)
+ {
+ struct nameidata nd;
++ struct lookup_intent it = { .it_op = IT_GETATTR };
+ int error, errcnt = 0;
+
+ again:
+- error = user_path_walk_link(filename, &nd);
++ error = user_path_walk_link_it(filename, &nd, &it);
+ if (!error) {
+- error = do_revalidate(nd.dentry);
++ error = do_revalidate(nd.dentry, &it);
+ if (!error)
+ error = cp_old_stat(nd.dentry->d_inode, statbuf);
++ intent_release(&it);
+ path_release(&nd);
+ }
+ if (error == -ESTALE && !errcnt) {
+@@ -214,14 +222,16 @@
+ asmlinkage long sys_newlstat(char * filename, struct stat * statbuf)
+ {
+ struct nameidata nd;
++ struct lookup_intent it = { .it_op = IT_GETATTR };
+ int error, errcnt = 0;
+
+ again:
+- error = user_path_walk_link(filename, &nd);
++ error = user_path_walk_link_it(filename, &nd, &it);
+ if (!error) {
+- error = do_revalidate(nd.dentry);
++ error = do_revalidate(nd.dentry, &it);
+ if (!error)
+ error = cp_new_stat(nd.dentry->d_inode, statbuf);
++ intent_release(&it);
+ path_release(&nd);
+ }
+
+@@ -248,7 +258,7 @@
+ if (f) {
+ struct dentry * dentry = f->f_dentry;
+
+- err = do_revalidate(dentry);
++ err = do_revalidate(dentry, NULL);
+ if (!err)
+ err = cp_old_stat(dentry->d_inode, statbuf);
+ fput(f);
+@@ -267,7 +277,7 @@
+ if (f) {
+ struct dentry * dentry = f->f_dentry;
+
+- err = do_revalidate(dentry);
++ err = do_revalidate(dentry, NULL);
+ if (!err)
+ err = cp_new_stat(dentry->d_inode, statbuf);
+ fput(f);
+@@ -289,7 +299,7 @@
+
+ error = -EINVAL;
+ if (inode->i_op && inode->i_op->readlink &&
+- !(error = do_revalidate(nd.dentry))) {
++ !(error = do_revalidate(nd.dentry, NULL))) {
+ UPDATE_ATIME(inode);
+ error = inode->i_op->readlink(nd.dentry, buf, bufsiz);
+ }
+@@ -364,14 +374,16 @@
+ asmlinkage long sys_stat64(char * filename, struct stat64 * statbuf, long flags)
+ {
+ struct nameidata nd;
++ struct lookup_intent it = { .it_op = IT_GETATTR };
+ int error, errcnt = 0;
+
+ again:
+- error = user_path_walk(filename, &nd);
++ error = user_path_walk_it(filename, &nd, &it);
+ if (!error) {
+- error = do_revalidate(nd.dentry);
++ error = do_revalidate(nd.dentry, &it);
+ if (!error)
+ error = cp_new_stat64(nd.dentry->d_inode, statbuf);
++ intent_release(&it);
+ path_release(&nd);
+ }
+ if (error == -ESTALE && !errcnt) {
+@@ -385,14 +397,16 @@
+ asmlinkage long sys_lstat64(char * filename, struct stat64 * statbuf, long flags)
+ {
+ struct nameidata nd;
++ struct lookup_intent it = { .it_op = IT_GETATTR };
+ int error, errcnt = 0;
+
+ again:
+- error = user_path_walk_link(filename, &nd);
++ error = user_path_walk_link_it(filename, &nd, &it);
+ if (!error) {
+- error = do_revalidate(nd.dentry);
++ error = do_revalidate(nd.dentry, &it);
+ if (!error)
+ error = cp_new_stat64(nd.dentry->d_inode, statbuf);
++ intent_release(&it);
+ path_release(&nd);
+ }
+ if (error == -ESTALE && !errcnt) {
+@@ -412,7 +426,7 @@
+ if (f) {
+ struct dentry * dentry = f->f_dentry;
+
+- err = do_revalidate(dentry);
++ err = do_revalidate(dentry, NULL);
+ if (!err)
+ err = cp_new_stat64(dentry->d_inode, statbuf);
+ fput(f);
+Index: linux-2.4.21/include/linux/dcache.h
+===================================================================
+--- linux-2.4.21.orig/include/linux/dcache.h 2004-09-11 10:16:39.000000000 -0400
++++ linux-2.4.21/include/linux/dcache.h 2004-09-16 19:32:11.000000000 -0400
+@@ -6,6 +6,51 @@
+ #include <asm/atomic.h>
+ #include <linux/mount.h>
+ #include <linux/kernel.h>
++#include <linux/string.h>
++
++#define IT_OPEN 0x0001
++#define IT_CREAT 0x0002
++#define IT_READDIR 0x0004
++#define IT_GETATTR 0x0008
++#define IT_LOOKUP 0x0010
++#define IT_UNLINK 0x0020
++#define IT_GETXATTR 0x0040
++#define IT_EXEC 0x0080
++#define IT_PIN 0x0100
++
++#define IT_FL_LOCKED 0x0001
++#define IT_FL_FOLLOWED 0x0002 /* set by vfs_follow_link */
++
++#define INTENT_MAGIC 0x19620323
++
++
++struct lustre_intent_data {
++ int it_disposition;
++ int it_status;
++ __u64 it_lock_handle;
++ void *it_data;
++ int it_lock_mode;
++ int it_int_flags;
++};
++struct lookup_intent {
++ int it_magic;
++ void (*it_op_release)(struct lookup_intent *);
++ int it_op;
++ int it_flags;
++ int it_create_mode;
++ union {
++ struct lustre_intent_data lustre;
++ } d;
++};
++
++static inline void intent_init(struct lookup_intent *it, int op, int flags)
++{
++ memset(it, 0, sizeof(*it));
++ it->it_magic = INTENT_MAGIC;
++ it->it_op = op;
++ it->it_flags = flags;
++}
++
+
+ /*
+ * linux/include/linux/dcache.h
+@@ -96,8 +141,22 @@
+ int (*d_delete)(struct dentry *);
+ void (*d_release)(struct dentry *);
+ void (*d_iput)(struct dentry *, struct inode *);
++ int (*d_revalidate_it)(struct dentry *, int, struct lookup_intent *);
++ void (*d_pin)(struct dentry *, struct vfsmount * , int);
++ void (*d_unpin)(struct dentry *, struct vfsmount *, int);
+ };
+
++#define PIN(de,mnt,flag) if (de && de->d_op && de->d_op->d_pin) \
++ de->d_op->d_pin(de, mnt, flag);
++#define UNPIN(de,mnt,flag) if (de && de->d_op && de->d_op->d_unpin) \
++ de->d_op->d_unpin(de, mnt, flag);
++
++
++/* defined in fs/namei.c */
++extern void intent_release(struct lookup_intent *it);
++/* defined in fs/dcache.c */
++extern void __d_rehash(struct dentry * entry, int lock);
++
+ /* the dentry parameter passed to d_hash and d_compare is the parent
+ * directory of the entries to be compared. It is used in case these
+ * functions need any directory specific information for determining
+@@ -129,6 +188,7 @@
+ * s_nfsd_free_path semaphore will be down
+ */
+ #define DCACHE_REFERENCED 0x0008 /* Recently used, don't discard. */
++#define DCACHE_LUSTRE_INVALID 0x0010 /* Lustre invalidated */
+
+ extern spinlock_t dcache_lock;
+
+Index: linux-2.4.21/include/linux/fs.h
+===================================================================
+--- linux-2.4.21.orig/include/linux/fs.h 2004-09-16 19:21:00.000000000 -0400
++++ linux-2.4.21/include/linux/fs.h 2004-09-16 19:32:11.000000000 -0400
+@@ -73,6 +73,7 @@
+
+ #define FMODE_READ 1
+ #define FMODE_WRITE 2
++#define FMODE_EXEC 4
+
+ #define READ 0
+ #define WRITE 1
+@@ -362,6 +363,9 @@
+ #define ATTR_MTIME_SET 256
+ #define ATTR_FORCE 512 /* Not a change, but a change it */
+ #define ATTR_ATTR_FLAG 1024
++#define ATTR_RAW 0x0800 /* file system, not vfs will massage attrs */
++#define ATTR_FROM_OPEN 0x1000 /* called from open path, ie O_TRUNC */
++#define ATTR_CTIME_SET 0x2000
+
+ /*
+ * This is the Inode Attributes structure, used for notify_change(). It
+@@ -499,6 +503,7 @@
+ struct pipe_inode_info *i_pipe;
+ struct block_device *i_bdev;
+ struct char_device *i_cdev;
++ void *i_filterdata;
+
+ unsigned long i_dnotify_mask; /* Directory notify events */
+ struct dnotify_struct *i_dnotify; /* for directory notifications */
+@@ -601,6 +606,7 @@
+
+ /* needed for tty driver, and maybe others */
+ void *private_data;
++ struct lookup_intent *f_it;
+
+ /* preallocated helper kiobuf to speedup O_DIRECT */
+ struct kiobuf *f_iobuf;
+@@ -729,6 +735,7 @@
+ struct qstr last;
+ unsigned int flags;
+ int last_type;
++ struct lookup_intent *intent;
+ };
+
+ /*
+@@ -849,7 +856,8 @@
+ extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
+ extern int vfs_rmdir(struct inode *, struct dentry *);
+ extern int vfs_unlink(struct inode *, struct dentry *);
+-extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
++int vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
++ struct inode *new_dir, struct dentry *new_dentry);
+
+ /*
+ * File types
+@@ -928,21 +936,32 @@
+
+ struct inode_operations {
+ int (*create) (struct inode *,struct dentry *,int);
++ int (*create_it) (struct inode *,struct dentry *,int, struct lookup_intent *);
+ struct dentry * (*lookup) (struct inode *,struct dentry *);
++ struct dentry * (*lookup_it) (struct inode *,struct dentry *, struct lookup_intent *, int flags);
+ int (*link) (struct dentry *,struct inode *,struct dentry *);
++ int (*link_raw) (struct nameidata *,struct nameidata *);
+ int (*unlink) (struct inode *,struct dentry *);
++ int (*unlink_raw) (struct nameidata *);
+ int (*symlink) (struct inode *,struct dentry *,const char *);
++ int (*symlink_raw) (struct nameidata *,const char *);
+ int (*mkdir) (struct inode *,struct dentry *,int);
++ int (*mkdir_raw) (struct nameidata *,int);
+ int (*rmdir) (struct inode *,struct dentry *);
++ int (*rmdir_raw) (struct nameidata *);
+ int (*mknod) (struct inode *,struct dentry *,int,int);
++ int (*mknod_raw) (struct nameidata *,int,dev_t);
+ int (*rename) (struct inode *, struct dentry *,
+ struct inode *, struct dentry *);
++ int (*rename_raw) (struct nameidata *, struct nameidata *);
+ int (*readlink) (struct dentry *, char *,int);
+ int (*follow_link) (struct dentry *, struct nameidata *);
+ void (*truncate) (struct inode *);
+ int (*permission) (struct inode *, int);
+ int (*revalidate) (struct dentry *);
++ int (*revalidate_it) (struct dentry *, struct lookup_intent *);
+ int (*setattr) (struct dentry *, struct iattr *);
++ int (*setattr_raw) (struct inode *, struct iattr *);
+ int (*getattr) (struct dentry *, struct iattr *);
+ int (*setxattr) (struct dentry *, const char *, const void *, size_t, int);
+ ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
+@@ -1139,10 +1158,14 @@
+
+ asmlinkage long sys_open(const char *, int, int);
+ asmlinkage long sys_close(unsigned int); /* yes, it's really unsigned */
+-extern int do_truncate(struct dentry *, loff_t start);
++extern int do_truncate(struct dentry *, loff_t start, int called_from_open);
+
+ extern struct file *filp_open(const char *, int, int);
+ extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);
++extern int open_namei_it(const char *filename, int namei_flags, int mode,
++ struct nameidata *nd, struct lookup_intent *it);
++extern struct file *dentry_open_it(struct dentry *dentry, struct vfsmount *mnt,
++ int flags, struct lookup_intent *it);
+ extern int filp_close(struct file *, fl_owner_t id);
+ extern char * getname(const char *);
+
+@@ -1434,6 +1457,7 @@
+ extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
+
+ extern int FASTCALL(__user_walk(const char *, unsigned, struct nameidata *));
++extern int FASTCALL(__user_walk_it(const char *, unsigned, struct nameidata *, struct lookup_intent *it));
+ extern int FASTCALL(path_init(const char *, unsigned, struct nameidata *));
+ extern int FASTCALL(path_walk(const char *, struct nameidata *));
+ extern int FASTCALL(path_lookup(const char *, unsigned, struct nameidata *));
+@@ -1445,6 +1469,8 @@
+ extern struct dentry * lookup_hash(struct qstr *, struct dentry *);
+ #define user_path_walk(name,nd) __user_walk(name, LOOKUP_FOLLOW|LOOKUP_POSITIVE, nd)
+ #define user_path_walk_link(name,nd) __user_walk(name, LOOKUP_POSITIVE, nd)
++#define user_path_walk_it(name,nd,it) __user_walk_it(name, LOOKUP_FOLLOW|LOOKUP_POSITIVE, nd, it)
++#define user_path_walk_link_it(name,nd,it) __user_walk_it(name, LOOKUP_POSITIVE, nd, it)
+
+ extern void inode_init_once(struct inode *);
+ extern void iput(struct inode *);
+@@ -1609,6 +1635,8 @@
+
+ extern int vfs_readlink(struct dentry *, char *, int, const char *);
+ extern int vfs_follow_link(struct nameidata *, const char *);
++extern int vfs_follow_link_it(struct nameidata *, const char *,
++ struct lookup_intent *it);
+ extern int page_readlink(struct dentry *, char *, int);
+ extern int page_follow_link(struct dentry *, struct nameidata *);
+ extern struct inode_operations page_symlink_inode_operations;
+Index: linux-2.4.21/include/linux/fs_struct.h
+===================================================================
+--- linux-2.4.21.orig/include/linux/fs_struct.h 2004-09-11 10:16:14.000000000 -0400
++++ linux-2.4.21/include/linux/fs_struct.h 2004-09-16 19:32:11.000000000 -0400
+@@ -37,10 +37,12 @@
+ write_lock(&fs->lock);
+ old_root = fs->root;
+ old_rootmnt = fs->rootmnt;
++ PIN(dentry, mnt, 1);
+ fs->rootmnt = mntget(mnt);
+ fs->root = dget(dentry);
+ write_unlock(&fs->lock);
+ if (old_root) {
++ UNPIN(old_root, old_rootmnt, 1);
+ dput(old_root);
+ mntput(old_rootmnt);
+ }
+@@ -60,10 +62,12 @@
+ write_lock(&fs->lock);
+ old_pwd = fs->pwd;
+ old_pwdmnt = fs->pwdmnt;
++ PIN(dentry, mnt, 0);
+ fs->pwdmnt = mntget(mnt);
+ fs->pwd = dget(dentry);
+ write_unlock(&fs->lock);
+ if (old_pwd) {
++ UNPIN(old_pwd, old_pwdmnt, 0);
+ dput(old_pwd);
+ mntput(old_pwdmnt);
+ }
+Index: linux-2.4.21/kernel/exit.c
+===================================================================
+--- linux-2.4.21.orig/kernel/exit.c 2004-09-11 10:16:35.000000000 -0400
++++ linux-2.4.21/kernel/exit.c 2004-09-16 19:32:11.000000000 -0400
+@@ -367,11 +367,14 @@
+ {
+ /* No need to hold fs->lock if we are killing it */
+ if (atomic_dec_and_test(&fs->count)) {
++ UNPIN(fs->pwd, fs->pwdmnt, 0);
++ UNPIN(fs->root, fs->rootmnt, 1);
+ dput(fs->root);
+ mntput(fs->rootmnt);
+ dput(fs->pwd);
+ mntput(fs->pwdmnt);
+ if (fs->altroot) {
++ UNPIN(fs->altroot, fs->altrootmnt, 1);
+ dput(fs->altroot);
+ mntput(fs->altrootmnt);
+ }
+Index: linux-2.4.21/kernel/fork.c
+===================================================================
+--- linux-2.4.21.orig/kernel/fork.c 2004-09-11 10:16:39.000000000 -0400
++++ linux-2.4.21/kernel/fork.c 2004-09-16 19:32:11.000000000 -0400
+@@ -472,10 +472,13 @@
+ fs->umask = old->umask;
+ read_lock(&old->lock);
+ fs->rootmnt = mntget(old->rootmnt);
++ PIN(old->pwd, old->pwdmnt, 0);
++ PIN(old->root, old->rootmnt, 1);
+ fs->root = dget(old->root);
+ fs->pwdmnt = mntget(old->pwdmnt);
+ fs->pwd = dget(old->pwd);
+ if (old->altroot) {
++ PIN(old->altroot, old->altrootmnt, 1);
+ fs->altrootmnt = mntget(old->altrootmnt);
+ fs->altroot = dget(old->altroot);
+ } else {
+Index: linux-2.4.21/kernel/ksyms.c
+===================================================================
+--- linux-2.4.21.orig/kernel/ksyms.c 2004-09-16 19:21:00.000000000 -0400
++++ linux-2.4.21/kernel/ksyms.c 2004-09-16 19:32:11.000000000 -0400
+@@ -317,6 +317,7 @@
+ EXPORT_SYMBOL(set_page_dirty);
+ EXPORT_SYMBOL(vfs_readlink);
+ EXPORT_SYMBOL(vfs_follow_link);
++EXPORT_SYMBOL(vfs_follow_link_it);
+ EXPORT_SYMBOL(page_readlink);
+ EXPORT_SYMBOL(page_follow_link);
+ EXPORT_SYMBOL(page_symlink_inode_operations);
git://git.whamcloud.com / fs / lustre-release.git / commitdiff