Hi,
In the following series I'm sending patches to ext2, ext3 and ext4
solving possible overflow of rec_len when using 64KB blocksize. Minming,
would you add these to the patch queue? Thanks.
Honza
--
Jan Kara <[email protected]>
SUSE Labs, CR
With 64KB blocksize, a directory entry can have size 64KB which does not fit
into 16 bits we have for entry lenght. So we store 0xffff instead and convert
value when read from / written to disk.
Signed-off-by: Jan Kara <[email protected]>
diff -rupX /home/jack/.kerndiffexclude linux-2.6.23-rc6/fs/ext2/dir.c linux-2.6.23-rc6-1-ext2_64k_blocksize/fs/ext2/dir.c
--- linux-2.6.23-rc6/fs/ext2/dir.c 2007-07-16 17:47:21.000000000 +0200
+++ linux-2.6.23-rc6-1-ext2_64k_blocksize/fs/ext2/dir.c 2007-09-24 19:26:13.000000000 +0200
@@ -26,6 +26,24 @@
typedef struct ext2_dir_entry_2 ext2_dirent;
+static inline unsigned ext2_rec_len_from_disk(__le16 dlen)
+{
+ unsigned len = le16_to_cpu(dlen);
+
+ if (len == EXT2_MAX_REC_LEN)
+ return 1 << 16;
+ return len;
+}
+
+static inline __le16 ext2_rec_len_to_disk(unsigned len)
+{
+ if (len == (1 << 16))
+ return cpu_to_le16(EXT2_MAX_REC_LEN);
+ else if (len > (1 << 16))
+ BUG();
+ return cpu_to_le16(len);
+}
+
/*
* ext2 uses block-sized chunks. Arguably, sector-sized ones would be
* more robust, but we have what we have
@@ -95,7 +113,7 @@ static void ext2_check_page(struct page
}
for (offs = 0; offs <= limit - EXT2_DIR_REC_LEN(1); offs += rec_len) {
p = (ext2_dirent *)(kaddr + offs);
- rec_len = le16_to_cpu(p->rec_len);
+ rec_len = ext2_rec_len_from_disk(p->rec_len);
if (rec_len < EXT2_DIR_REC_LEN(1))
goto Eshort;
@@ -193,7 +211,8 @@ static inline int ext2_match (int len, c
*/
static inline ext2_dirent *ext2_next_entry(ext2_dirent *p)
{
- return (ext2_dirent *)((char*)p + le16_to_cpu(p->rec_len));
+ return (ext2_dirent *)((char*)p +
+ ext2_rec_len_from_disk(p->rec_len));
}
static inline unsigned
@@ -305,7 +324,7 @@ ext2_readdir (struct file * filp, void *
return 0;
}
}
- filp->f_pos += le16_to_cpu(de->rec_len);
+ filp->f_pos += ext2_rec_len_from_disk(de->rec_len);
}
ext2_put_page(page);
}
@@ -413,7 +432,7 @@ void ext2_set_link(struct inode *dir, st
struct page *page, struct inode *inode)
{
unsigned from = (char *) de - (char *) page_address(page);
- unsigned to = from + le16_to_cpu(de->rec_len);
+ unsigned to = from + ext2_rec_len_from_disk(de->rec_len);
int err;
lock_page(page);
@@ -469,7 +488,7 @@ int ext2_add_link (struct dentry *dentry
/* We hit i_size */
name_len = 0;
rec_len = chunk_size;
- de->rec_len = cpu_to_le16(chunk_size);
+ de->rec_len = ext2_rec_len_to_disk(chunk_size);
de->inode = 0;
goto got_it;
}
@@ -483,7 +502,7 @@ int ext2_add_link (struct dentry *dentry
if (ext2_match (namelen, name, de))
goto out_unlock;
name_len = EXT2_DIR_REC_LEN(de->name_len);
- rec_len = le16_to_cpu(de->rec_len);
+ rec_len = ext2_rec_len_from_disk(de->rec_len);
if (!de->inode && rec_len >= reclen)
goto got_it;
if (rec_len >= name_len + reclen)
@@ -504,8 +523,8 @@ got_it:
goto out_unlock;
if (de->inode) {
ext2_dirent *de1 = (ext2_dirent *) ((char *) de + name_len);
- de1->rec_len = cpu_to_le16(rec_len - name_len);
- de->rec_len = cpu_to_le16(name_len);
+ de1->rec_len = ext2_rec_len_to_disk(rec_len - name_len);
+ de->rec_len = ext2_rec_len_to_disk(name_len);
de = de1;
}
de->name_len = namelen;
@@ -536,7 +555,7 @@ int ext2_delete_entry (struct ext2_dir_e
struct inode *inode = mapping->host;
char *kaddr = page_address(page);
unsigned from = ((char*)dir - kaddr) & ~(ext2_chunk_size(inode)-1);
- unsigned to = ((char*)dir - kaddr) + le16_to_cpu(dir->rec_len);
+ unsigned to = ((char*)dir - kaddr) + ext2_rec_len_from_disk(dir->rec_len);
ext2_dirent * pde = NULL;
ext2_dirent * de = (ext2_dirent *) (kaddr + from);
int err;
@@ -557,7 +576,7 @@ int ext2_delete_entry (struct ext2_dir_e
err = mapping->a_ops->prepare_write(NULL, page, from, to);
BUG_ON(err);
if (pde)
- pde->rec_len = cpu_to_le16(to-from);
+ pde->rec_len = ext2_rec_len_to_disk(to-from);
dir->inode = 0;
err = ext2_commit_chunk(page, from, to);
inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
@@ -591,14 +610,14 @@ int ext2_make_empty(struct inode *inode,
memset(kaddr, 0, chunk_size);
de = (struct ext2_dir_entry_2 *)kaddr;
de->name_len = 1;
- de->rec_len = cpu_to_le16(EXT2_DIR_REC_LEN(1));
+ de->rec_len = ext2_rec_len_to_disk(EXT2_DIR_REC_LEN(1));
memcpy (de->name, ".\0\0", 4);
de->inode = cpu_to_le32(inode->i_ino);
ext2_set_de_type (de, inode);
de = (struct ext2_dir_entry_2 *)(kaddr + EXT2_DIR_REC_LEN(1));
de->name_len = 2;
- de->rec_len = cpu_to_le16(chunk_size - EXT2_DIR_REC_LEN(1));
+ de->rec_len = ext2_rec_len_to_disk(chunk_size - EXT2_DIR_REC_LEN(1));
de->inode = cpu_to_le32(parent->i_ino);
memcpy (de->name, "..\0", 4);
ext2_set_de_type (de, inode);
diff -rupX /home/jack/.kerndiffexclude linux-2.6.23-rc6/include/linux/ext2_fs.h linux-2.6.23-rc6-1-ext2_64k_blocksize/include/linux/ext2_fs.h
--- linux-2.6.23-rc6/include/linux/ext2_fs.h 2006-11-29 22:57:37.000000000 +0100
+++ linux-2.6.23-rc6-1-ext2_64k_blocksize/include/linux/ext2_fs.h 2007-09-24 19:20:08.000000000 +0200
@@ -557,5 +557,6 @@ enum {
#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
~EXT2_DIR_ROUND)
+#define EXT2_MAX_REC_LEN ((1<<16)-1)
#endif /* _LINUX_EXT2_FS_H */
With 64KB blocksize, a directory entry can have size 64KB which does not fit
into 16 bits we have for entry lenght. So we store 0xffff instead and convert
value when read from / written to disk. The patch also converts some places
to use ext3_next_entry() when we are changing them anyway.
Signed-off-by: Jan Kara <[email protected]>
diff -rupX /home/jack/.kerndiffexclude linux-2.6.23-rc6/fs/ext3/dir.c linux-2.6.23-rc6-1-ext3_64k_blocksize/fs/ext3/dir.c
--- linux-2.6.23-rc6/fs/ext3/dir.c 2007-09-18 19:22:28.000000000 +0200
+++ linux-2.6.23-rc6-1-ext3_64k_blocksize/fs/ext3/dir.c 2007-09-24 18:54:56.000000000 +0200
@@ -69,7 +69,7 @@ int ext3_check_dir_entry (const char * f
unsigned long offset)
{
const char * error_msg = NULL;
- const int rlen = le16_to_cpu(de->rec_len);
+ const int rlen = ext3_rec_len_from_disk(de->rec_len);
if (rlen < EXT3_DIR_REC_LEN(1))
error_msg = "rec_len is smaller than minimal";
@@ -177,10 +177,10 @@ revalidate:
* least that it is non-zero. A
* failure will be detected in the
* dirent test below. */
- if (le16_to_cpu(de->rec_len) <
+ if (ext3_rec_len_from_disk(de->rec_len) <
EXT3_DIR_REC_LEN(1))
break;
- i += le16_to_cpu(de->rec_len);
+ i += ext3_rec_len_from_disk(de->rec_len);
}
offset = i;
filp->f_pos = (filp->f_pos & ~(sb->s_blocksize - 1))
@@ -201,7 +201,7 @@ revalidate:
ret = stored;
goto out;
}
- offset += le16_to_cpu(de->rec_len);
+ offset += ext3_rec_len_from_disk(de->rec_len);
if (le32_to_cpu(de->inode)) {
/* We might block in the next section
* if the data destination is
@@ -223,7 +223,7 @@ revalidate:
goto revalidate;
stored ++;
}
- filp->f_pos += le16_to_cpu(de->rec_len);
+ filp->f_pos += ext3_rec_len_from_disk(de->rec_len);
}
offset = 0;
brelse (bh);
diff -rupX /home/jack/.kerndiffexclude linux-2.6.23-rc6/fs/ext3/namei.c linux-2.6.23-rc6-1-ext3_64k_blocksize/fs/ext3/namei.c
--- linux-2.6.23-rc6/fs/ext3/namei.c 2007-09-18 19:22:28.000000000 +0200
+++ linux-2.6.23-rc6-1-ext3_64k_blocksize/fs/ext3/namei.c 2007-09-24 19:07:51.000000000 +0200
@@ -143,6 +143,15 @@ struct dx_map_entry
u32 offs;
};
+/*
+ * 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 +
+ ext3_rec_len_from_disk(p->rec_len));
+}
+
#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);
@@ -280,7 +289,7 @@ static struct stats dx_show_leaf(struct
space += EXT3_DIR_REC_LEN(de->name_len);
names++;
}
- de = (struct ext3_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
+ de = ext3_next_entry(de);
}
printk("(%i)\n", names);
return (struct stats) { names, space, 1 };
@@ -521,14 +530,6 @@ static int ext3_htree_next_block(struct
/*
- * 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 block. It returns the number directory entries loaded
* into the tree. If there is an error it is returned in err.
@@ -689,7 +690,7 @@ static int dx_make_map (struct ext3_dir_
cond_resched();
}
/* 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));
+ de = ext3_next_entry(de);
}
return count;
}
@@ -792,7 +793,7 @@ static inline int search_dirblock(struct
return 1;
}
/* prevent looping on a bad block */
- de_len = le16_to_cpu(de->rec_len);
+ de_len = ext3_rec_len_from_disk(de->rec_len);
if (de_len <= 0)
return -1;
offset += de_len;
@@ -1101,7 +1102,7 @@ dx_move_dirents(char *from, char *to, st
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);
+ ext3_rec_len_to_disk(rec_len);
de->inode = 0;
map++;
to += rec_len;
@@ -1116,13 +1117,12 @@ static struct ext3_dir_entry_2* dx_pack_
prev = to = de;
while ((char*)de < base + size) {
- next = (struct ext3_dir_entry_2 *) ((char *) de +
- le16_to_cpu(de->rec_len));
+ next = ext3_next_entry(de);
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);
+ to->rec_len = ext3_rec_len_to_disk(rec_len);
prev = to;
to = (struct ext3_dir_entry_2 *) (((char *) to) + rec_len);
}
@@ -1180,8 +1180,8 @@ static struct ext3_dir_entry_2 *do_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);
+ de->rec_len = ext3_rec_len_to_disk(data1 + blocksize - (char *) de);
+ de2->rec_len = ext3_rec_len_to_disk(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));
@@ -1252,7 +1252,7 @@ static int add_dirent_to_buf(handle_t *h
return -EEXIST;
}
nlen = EXT3_DIR_REC_LEN(de->name_len);
- rlen = le16_to_cpu(de->rec_len);
+ rlen = ext3_rec_len_from_disk(de->rec_len);
if ((de->inode? rlen - nlen: rlen) >= reclen)
break;
de = (struct ext3_dir_entry_2 *)((char *)de + rlen);
@@ -1271,11 +1271,11 @@ static int add_dirent_to_buf(handle_t *h
/* By now the buffer is marked for journaling */
nlen = EXT3_DIR_REC_LEN(de->name_len);
- rlen = le16_to_cpu(de->rec_len);
+ rlen = ext3_rec_len_from_disk(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);
+ de1->rec_len = ext3_rec_len_to_disk(rlen - nlen);
+ de->rec_len = ext3_rec_len_to_disk(nlen);
de = de1;
}
de->file_type = EXT3_FT_UNKNOWN;
@@ -1353,17 +1353,18 @@ static int make_indexed_dir(handle_t *ha
/* The 0th block becomes the root, move the dirents out */
fde = &root->dotdot;
- de = (struct ext3_dir_entry_2 *)((char *)fde + le16_to_cpu(fde->rec_len));
+ de = (struct ext3_dir_entry_2 *)((char *)fde +
+ ext3_rec_len_from_disk(fde->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=(void*)de+le16_to_cpu(de->rec_len)) < top)
+ while ((char *)(de2 = ext3_next_entry(de)) < top)
de = de2;
- de->rec_len = cpu_to_le16(data1 + blocksize - (char *) de);
+ de->rec_len = ext3_rec_len_to_disk(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));
+ de->rec_len = ext3_rec_len_to_disk(blocksize - EXT3_DIR_REC_LEN(2));
memset (&root->info, 0, sizeof(root->info));
root->info.info_length = sizeof(root->info);
root->info.hash_version = EXT3_SB(dir->i_sb)->s_def_hash_version;
@@ -1450,7 +1451,7 @@ static int ext3_add_entry (handle_t *han
return retval;
de = (struct ext3_dir_entry_2 *) bh->b_data;
de->inode = 0;
- de->rec_len = cpu_to_le16(blocksize);
+ de->rec_len = ext3_rec_len_to_disk(blocksize);
return add_dirent_to_buf(handle, dentry, inode, de, bh);
}
@@ -1514,7 +1515,7 @@ static int ext3_dx_add_entry(handle_t *h
goto cleanup;
node2 = (struct dx_node *)(bh2->b_data);
entries2 = node2->entries;
- node2->fake.rec_len = cpu_to_le16(sb->s_blocksize);
+ node2->fake.rec_len = ext3_rec_len_to_disk(sb->s_blocksize);
node2->fake.inode = 0;
BUFFER_TRACE(frame->bh, "get_write_access");
err = ext3_journal_get_write_access(handle, frame->bh);
@@ -1613,9 +1614,9 @@ static int ext3_delete_entry (handle_t *
BUFFER_TRACE(bh, "get_write_access");
ext3_journal_get_write_access(handle, bh);
if (pde)
- pde->rec_len =
- cpu_to_le16(le16_to_cpu(pde->rec_len) +
- le16_to_cpu(de->rec_len));
+ pde->rec_len = ext3_rec_len_to_disk(
+ ext3_rec_len_from_disk(pde->rec_len) +
+ ext3_rec_len_from_disk(de->rec_len));
else
de->inode = 0;
dir->i_version++;
@@ -1623,10 +1624,9 @@ static int ext3_delete_entry (handle_t *
ext3_journal_dirty_metadata(handle, bh);
return 0;
}
- i += le16_to_cpu(de->rec_len);
+ i += ext3_rec_len_from_disk(de->rec_len);
pde = de;
- de = (struct ext3_dir_entry_2 *)
- ((char *) de + le16_to_cpu(de->rec_len));
+ de = ext3_next_entry(de);
}
return -ENOENT;
}
@@ -1760,13 +1760,12 @@ retry:
de = (struct ext3_dir_entry_2 *) dir_block->b_data;
de->inode = cpu_to_le32(inode->i_ino);
de->name_len = 1;
- de->rec_len = cpu_to_le16(EXT3_DIR_REC_LEN(de->name_len));
+ de->rec_len = ext3_rec_len_to_disk(EXT3_DIR_REC_LEN(de->name_len));
strcpy (de->name, ".");
ext3_set_de_type(dir->i_sb, de, S_IFDIR);
- de = (struct ext3_dir_entry_2 *)
- ((char *) de + le16_to_cpu(de->rec_len));
+ de = ext3_next_entry(de);
de->inode = cpu_to_le32(dir->i_ino);
- de->rec_len = cpu_to_le16(inode->i_sb->s_blocksize-EXT3_DIR_REC_LEN(1));
+ de->rec_len = ext3_rec_len_to_disk(inode->i_sb->s_blocksize-EXT3_DIR_REC_LEN(1));
de->name_len = 2;
strcpy (de->name, "..");
ext3_set_de_type(dir->i_sb, de, S_IFDIR);
@@ -1818,8 +1817,7 @@ static int empty_dir (struct inode * ino
return 1;
}
de = (struct ext3_dir_entry_2 *) bh->b_data;
- de1 = (struct ext3_dir_entry_2 *)
- ((char *) de + le16_to_cpu(de->rec_len));
+ de1 = ext3_next_entry(de);
if (le32_to_cpu(de->inode) != inode->i_ino ||
!le32_to_cpu(de1->inode) ||
strcmp (".", de->name) ||
@@ -1830,9 +1828,9 @@ static int empty_dir (struct inode * ino
brelse (bh);
return 1;
}
- offset = le16_to_cpu(de->rec_len) + le16_to_cpu(de1->rec_len);
- de = (struct ext3_dir_entry_2 *)
- ((char *) de1 + le16_to_cpu(de1->rec_len));
+ offset = ext3_rec_len_from_disk(de->rec_len) +
+ ext3_rec_len_from_disk(de1->rec_len);
+ de = ext3_next_entry(de1);
while (offset < inode->i_size ) {
if (!bh ||
(void *) de >= (void *) (bh->b_data+sb->s_blocksize)) {
@@ -1861,9 +1859,8 @@ static int empty_dir (struct inode * ino
brelse (bh);
return 0;
}
- offset += le16_to_cpu(de->rec_len);
- de = (struct ext3_dir_entry_2 *)
- ((char *) de + le16_to_cpu(de->rec_len));
+ offset += ext3_rec_len_from_disk(de->rec_len);
+ de = ext3_next_entry(de);
}
brelse (bh);
return 1;
@@ -2217,8 +2214,7 @@ retry:
}
#define PARENT_INO(buffer) \
- ((struct ext3_dir_entry_2 *) ((char *) buffer + \
- le16_to_cpu(((struct ext3_dir_entry_2 *) buffer)->rec_len)))->inode
+ (ext3_next_entry((struct ext3_dir_entry_2 *)(buffer))->inode)
/*
* Anybody can rename anything with this: the permission checks are left to the
diff -rupX /home/jack/.kerndiffexclude linux-2.6.23-rc6/include/linux/ext3_fs.h linux-2.6.23-rc6-1-ext3_64k_blocksize/include/linux/ext3_fs.h
--- linux-2.6.23-rc6/include/linux/ext3_fs.h 2007-07-16 17:47:28.000000000 +0200
+++ linux-2.6.23-rc6-1-ext3_64k_blocksize/include/linux/ext3_fs.h 2007-09-24 18:50:52.000000000 +0200
@@ -660,6 +660,26 @@ struct ext3_dir_entry_2 {
#define EXT3_DIR_ROUND (EXT3_DIR_PAD - 1)
#define EXT3_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT3_DIR_ROUND) & \
~EXT3_DIR_ROUND)
+#define EXT3_MAX_REC_LEN ((1<<16)-1)
+
+static inline unsigned ext3_rec_len_from_disk(__le16 dlen)
+{
+ unsigned len = le16_to_cpu(dlen);
+
+ if (len == EXT3_MAX_REC_LEN)
+ return 1 << 16;
+ return len;
+}
+
+static inline __le16 ext3_rec_len_to_disk(unsigned len)
+{
+ if (len == (1 << 16))
+ return cpu_to_le16(EXT3_MAX_REC_LEN);
+ else if (len > (1 << 16))
+ BUG();
+ return cpu_to_le16(len);
+}
+
/*
* Hash Tree Directory indexing
* (c) Daniel Phillips, 2001
With 64KB blocksize, a directory entry can have size 64KB which does not fit
into 16 bits we have for entry lenght. So we store 0xffff instead and convert
value when read from / written to disk. The patch also converts some places
to use ext4_next_entry() when we are changing them anyway.
Signed-off-by: Jan Kara <[email protected]>
diff -rupX /home/jack/.kerndiffexclude linux-2.6.23-rc6/fs/ext4/dir.c linux-2.6.23-rc6-1-ext4_64k_blocksize/fs/ext4/dir.c
--- linux-2.6.23-rc6/fs/ext4/dir.c 2007-09-18 19:22:28.000000000 +0200
+++ linux-2.6.23-rc6-1-ext4_64k_blocksize/fs/ext4/dir.c 2007-09-24 18:30:13.000000000 +0200
@@ -69,7 +69,7 @@ int ext4_check_dir_entry (const char * f
unsigned long offset)
{
const char * error_msg = NULL;
- const int rlen = le16_to_cpu(de->rec_len);
+ const int rlen = ext4_rec_len_from_disk(de->rec_len);
if (rlen < EXT4_DIR_REC_LEN(1))
error_msg = "rec_len is smaller than minimal";
@@ -176,10 +176,10 @@ revalidate:
* least that it is non-zero. A
* failure will be detected in the
* dirent test below. */
- if (le16_to_cpu(de->rec_len) <
- EXT4_DIR_REC_LEN(1))
+ if (ext4_rec_len_from_disk(de->rec_len)
+ < EXT4_DIR_REC_LEN(1))
break;
- i += le16_to_cpu(de->rec_len);
+ i += ext4_rec_len_from_disk(de->rec_len);
}
offset = i;
filp->f_pos = (filp->f_pos & ~(sb->s_blocksize - 1))
@@ -201,7 +201,7 @@ revalidate:
ret = stored;
goto out;
}
- offset += le16_to_cpu(de->rec_len);
+ offset += ext4_rec_len_from_disk(de->rec_len);
if (le32_to_cpu(de->inode)) {
/* We might block in the next section
* if the data destination is
@@ -223,7 +223,7 @@ revalidate:
goto revalidate;
stored ++;
}
- filp->f_pos += le16_to_cpu(de->rec_len);
+ filp->f_pos += ext4_rec_len_from_disk(de->rec_len);
}
offset = 0;
brelse (bh);
diff -rupX /home/jack/.kerndiffexclude linux-2.6.23-rc6/fs/ext4/namei.c linux-2.6.23-rc6-1-ext4_64k_blocksize/fs/ext4/namei.c
--- linux-2.6.23-rc6/fs/ext4/namei.c 2007-09-18 19:22:28.000000000 +0200
+++ linux-2.6.23-rc6-1-ext4_64k_blocksize/fs/ext4/namei.c 2007-09-24 18:35:34.000000000 +0200
@@ -280,7 +280,7 @@ static struct stats dx_show_leaf(struct
space += EXT4_DIR_REC_LEN(de->name_len);
names++;
}
- de = (struct ext4_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
+ de = ext4_next_entry(de);
}
printk("(%i)\n", names);
return (struct stats) { names, space, 1 };
@@ -525,7 +525,8 @@ static int ext4_htree_next_block(struct
*/
static inline struct ext4_dir_entry_2 *ext4_next_entry(struct ext4_dir_entry_2 *p)
{
- return (struct ext4_dir_entry_2 *)((char*)p + le16_to_cpu(p->rec_len));
+ return (struct ext4_dir_entry_2 *)((char*)p +
+ ext4_rec_len_from_disk(p->rec_len));
}
/*
@@ -689,7 +690,7 @@ static int dx_make_map (struct ext4_dir_
cond_resched();
}
/* XXX: do we need to check rec_len == 0 case? -Chris */
- de = (struct ext4_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
+ de = ext4_next_entry(de);
}
return count;
}
@@ -790,7 +791,7 @@ static inline int search_dirblock(struct
return 1;
}
/* prevent looping on a bad block */
- de_len = le16_to_cpu(de->rec_len);
+ de_len = ext4_rec_len_from_disk(de->rec_len);
if (de_len <= 0)
return -1;
offset += de_len;
@@ -1099,7 +1100,7 @@ dx_move_dirents(char *from, char *to, st
rec_len = EXT4_DIR_REC_LEN(de->name_len);
memcpy (to, de, rec_len);
((struct ext4_dir_entry_2 *) to)->rec_len =
- cpu_to_le16(rec_len);
+ ext4_rec_len_to_disk(rec_len);
de->inode = 0;
map++;
to += rec_len;
@@ -1114,13 +1115,12 @@ static struct ext4_dir_entry_2* dx_pack_
prev = to = de;
while ((char*)de < base + size) {
- next = (struct ext4_dir_entry_2 *) ((char *) de +
- le16_to_cpu(de->rec_len));
+ next = ext4_next_entry(de);
if (de->inode && de->name_len) {
rec_len = EXT4_DIR_REC_LEN(de->name_len);
if (de > to)
memmove(to, de, rec_len);
- to->rec_len = cpu_to_le16(rec_len);
+ to->rec_len = ext4_rec_len_to_disk(rec_len);
prev = to;
to = (struct ext4_dir_entry_2 *) (((char *) to) + rec_len);
}
@@ -1178,8 +1178,8 @@ static struct ext4_dir_entry_2 *do_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);
+ de->rec_len = ext4_rec_len_to_disk(data1 + blocksize - (char *) de);
+ de2->rec_len = ext4_rec_len_to_disk(data2 + blocksize - (char *) de2);
dxtrace(dx_show_leaf (hinfo, (struct ext4_dir_entry_2 *) data1, blocksize, 1));
dxtrace(dx_show_leaf (hinfo, (struct ext4_dir_entry_2 *) data2, blocksize, 1));
@@ -1250,7 +1250,7 @@ static int add_dirent_to_buf(handle_t *h
return -EEXIST;
}
nlen = EXT4_DIR_REC_LEN(de->name_len);
- rlen = le16_to_cpu(de->rec_len);
+ rlen = ext4_rec_len_from_disk(de->rec_len);
if ((de->inode? rlen - nlen: rlen) >= reclen)
break;
de = (struct ext4_dir_entry_2 *)((char *)de + rlen);
@@ -1269,11 +1269,11 @@ static int add_dirent_to_buf(handle_t *h
/* By now the buffer is marked for journaling */
nlen = EXT4_DIR_REC_LEN(de->name_len);
- rlen = le16_to_cpu(de->rec_len);
+ rlen = ext4_rec_len_from_disk(de->rec_len);
if (de->inode) {
struct ext4_dir_entry_2 *de1 = (struct ext4_dir_entry_2 *)((char *)de + nlen);
- de1->rec_len = cpu_to_le16(rlen - nlen);
- de->rec_len = cpu_to_le16(nlen);
+ de1->rec_len = ext4_rec_len_to_disk(rlen - nlen);
+ de->rec_len = ext4_rec_len_to_disk(nlen);
de = de1;
}
de->file_type = EXT4_FT_UNKNOWN;
@@ -1351,17 +1351,18 @@ static int make_indexed_dir(handle_t *ha
/* The 0th block becomes the root, move the dirents out */
fde = &root->dotdot;
- de = (struct ext4_dir_entry_2 *)((char *)fde + le16_to_cpu(fde->rec_len));
+ de = (struct ext4_dir_entry_2 *)((char *)fde +
+ ext4_rec_len_from_disk(fde->rec_len));
len = ((char *) root) + blocksize - (char *) de;
memcpy (data1, de, len);
de = (struct ext4_dir_entry_2 *) data1;
top = data1 + len;
- while ((char *)(de2=(void*)de+le16_to_cpu(de->rec_len)) < top)
+ while ((char *)(de2 = ext4_next_entry(de)) < top)
de = de2;
- de->rec_len = cpu_to_le16(data1 + blocksize - (char *) de);
+ de->rec_len = ext4_rec_len_to_disk(data1 + blocksize - (char *) de);
/* Initialize the root; the dot dirents already exist */
de = (struct ext4_dir_entry_2 *) (&root->dotdot);
- de->rec_len = cpu_to_le16(blocksize - EXT4_DIR_REC_LEN(2));
+ de->rec_len = ext4_rec_len_to_disk(blocksize - EXT4_DIR_REC_LEN(2));
memset (&root->info, 0, sizeof(root->info));
root->info.info_length = sizeof(root->info);
root->info.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version;
@@ -1448,7 +1449,7 @@ static int ext4_add_entry (handle_t *han
return retval;
de = (struct ext4_dir_entry_2 *) bh->b_data;
de->inode = 0;
- de->rec_len = cpu_to_le16(blocksize);
+ de->rec_len = ext4_rec_len_to_disk(blocksize);
return add_dirent_to_buf(handle, dentry, inode, de, bh);
}
@@ -1512,7 +1513,7 @@ static int ext4_dx_add_entry(handle_t *h
goto cleanup;
node2 = (struct dx_node *)(bh2->b_data);
entries2 = node2->entries;
- node2->fake.rec_len = cpu_to_le16(sb->s_blocksize);
+ node2->fake.rec_len = ext4_rec_len_to_disk(sb->s_blocksize);
node2->fake.inode = 0;
BUFFER_TRACE(frame->bh, "get_write_access");
err = ext4_journal_get_write_access(handle, frame->bh);
@@ -1611,9 +1612,9 @@ static int ext4_delete_entry (handle_t *
BUFFER_TRACE(bh, "get_write_access");
ext4_journal_get_write_access(handle, bh);
if (pde)
- pde->rec_len =
- cpu_to_le16(le16_to_cpu(pde->rec_len) +
- le16_to_cpu(de->rec_len));
+ pde->rec_len = ext4_rec_len_to_disk(
+ ext4_rec_len_from_disk(pde->rec_len) +
+ ext4_rec_len_from_disk(de->rec_len));
else
de->inode = 0;
dir->i_version++;
@@ -1621,10 +1622,9 @@ static int ext4_delete_entry (handle_t *
ext4_journal_dirty_metadata(handle, bh);
return 0;
}
- i += le16_to_cpu(de->rec_len);
+ i += ext4_rec_len_from_disk(de->rec_len);
pde = de;
- de = (struct ext4_dir_entry_2 *)
- ((char *) de + le16_to_cpu(de->rec_len));
+ de = ext4_next_entry(de);
}
return -ENOENT;
}
@@ -1787,13 +1787,12 @@ retry:
de = (struct ext4_dir_entry_2 *) dir_block->b_data;
de->inode = cpu_to_le32(inode->i_ino);
de->name_len = 1;
- de->rec_len = cpu_to_le16(EXT4_DIR_REC_LEN(de->name_len));
+ de->rec_len = ext4_rec_len_to_disk(EXT4_DIR_REC_LEN(de->name_len));
strcpy (de->name, ".");
ext4_set_de_type(dir->i_sb, de, S_IFDIR);
- de = (struct ext4_dir_entry_2 *)
- ((char *) de + le16_to_cpu(de->rec_len));
+ de = ext4_next_entry(de);
de->inode = cpu_to_le32(dir->i_ino);
- de->rec_len = cpu_to_le16(inode->i_sb->s_blocksize-EXT4_DIR_REC_LEN(1));
+ de->rec_len = ext4_rec_len_to_disk(inode->i_sb->s_blocksize-EXT4_DIR_REC_LEN(1));
de->name_len = 2;
strcpy (de->name, "..");
ext4_set_de_type(dir->i_sb, de, S_IFDIR);
@@ -1845,8 +1844,7 @@ static int empty_dir (struct inode * ino
return 1;
}
de = (struct ext4_dir_entry_2 *) bh->b_data;
- de1 = (struct ext4_dir_entry_2 *)
- ((char *) de + le16_to_cpu(de->rec_len));
+ de1 = ext4_next_entry(de);
if (le32_to_cpu(de->inode) != inode->i_ino ||
!le32_to_cpu(de1->inode) ||
strcmp (".", de->name) ||
@@ -1857,9 +1855,9 @@ static int empty_dir (struct inode * ino
brelse (bh);
return 1;
}
- offset = le16_to_cpu(de->rec_len) + le16_to_cpu(de1->rec_len);
- de = (struct ext4_dir_entry_2 *)
- ((char *) de1 + le16_to_cpu(de1->rec_len));
+ offset = ext4_rec_len_from_disk(de->rec_len) +
+ ext4_rec_len_from_disk(de1->rec_len);
+ de = ext4_next_entry(de1);
while (offset < inode->i_size ) {
if (!bh ||
(void *) de >= (void *) (bh->b_data+sb->s_blocksize)) {
@@ -1888,9 +1886,8 @@ static int empty_dir (struct inode * ino
brelse (bh);
return 0;
}
- offset += le16_to_cpu(de->rec_len);
- de = (struct ext4_dir_entry_2 *)
- ((char *) de + le16_to_cpu(de->rec_len));
+ offset += ext4_rec_len_from_disk(de->rec_len);
+ de = ext4_next_entry(de);
}
brelse (bh);
return 1;
@@ -2245,8 +2242,7 @@ retry:
}
#define PARENT_INO(buffer) \
- ((struct ext4_dir_entry_2 *) ((char *) buffer + \
- le16_to_cpu(((struct ext4_dir_entry_2 *) buffer)->rec_len)))->inode
+ (ext4_next_entry((struct ext4_dir_entry_2 *)(buffer))->inode)
/*
* Anybody can rename anything with this: the permission checks are left to the
diff -rupX /home/jack/.kerndiffexclude linux-2.6.23-rc6/include/linux/ext4_fs.h linux-2.6.23-rc6-1-ext4_64k_blocksize/include/linux/ext4_fs.h
--- linux-2.6.23-rc6/include/linux/ext4_fs.h 2007-09-18 19:22:32.000000000 +0200
+++ linux-2.6.23-rc6-1-ext4_64k_blocksize/include/linux/ext4_fs.h 2007-09-24 18:28:45.000000000 +0200
@@ -784,6 +784,26 @@ struct ext4_dir_entry_2 {
#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
~EXT4_DIR_ROUND)
+#define EXT4_MAX_REC_LEN ((1<<16)-1)
+
+static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
+{
+ unsigned len = le16_to_cpu(dlen);
+
+ if (len == EXT4_MAX_REC_LEN)
+ return 1 << 16;
+ return len;
+}
+
+static inline __le16 ext4_rec_len_to_disk(unsigned len)
+{
+ if (len == (1 << 16))
+ return cpu_to_le16(EXT4_MAX_REC_LEN);
+ else if (len > (1 << 16))
+ BUG();
+ return cpu_to_le16(len);
+}
+
/*
* Hash Tree Directory indexing
* (c) Daniel Phillips, 2001