ext4_fsblk_t bg_start;
ext4_fsblk_t last_block;
ext4_grpblk_t colour;
+ ext4_group_t block_group;
+ int flex_size = ext4_flex_bg_size(EXT4_SB(inode->i_sb));
int depth;
if (path) {
}
/* OK. use inode's group */
- bg_start = (ei->i_block_group * EXT4_BLOCKS_PER_GROUP(inode->i_sb)) +
+ block_group = ei->i_block_group;
+ if (flex_size >= EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME) {
+ /*
+ * If there are at least EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME
+ * block groups per flexgroup, reserve the first block
+ * group for directories and special files. Regular
+ * files will start at the second block group. This
+ * tends to speed up directory access and improves
+ * fsck times.
+ */
+ block_group &= ~(flex_size-1);
+ if (S_ISREG(inode->i_mode))
+ block_group++;
+ }
+ bg_start = (block_group * EXT4_BLOCKS_PER_GROUP(inode->i_sb)) +
le32_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_first_data_block);
last_block = ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es) - 1;
+ /*
+ * If we are doing delayed allocation, we don't need take
+ * colour into account.
+ */
+ if (test_opt(inode->i_sb, DELALLOC))
+ return bg_start;
+
if (bg_start + EXT4_BLOCKS_PER_GROUP(inode->i_sb) <= last_block)
colour = (current->pid % 16) *
(EXT4_BLOCKS_PER_GROUP(inode->i_sb) / 16);
return max;
}
-static int __ext4_ext_check_header(const char *function, struct inode *inode,
+static int ext4_valid_extent(struct inode *inode, struct ext4_extent *ext)
+{
+ ext4_fsblk_t block = ext_pblock(ext);
+ int len = ext4_ext_get_actual_len(ext);
+ struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
+ if (unlikely(block < le32_to_cpu(es->s_first_data_block) ||
+ ((block + len) > ext4_blocks_count(es))))
+ return 0;
+ else
+ return 1;
+}
+
+static int ext4_valid_extent_idx(struct inode *inode,
+ struct ext4_extent_idx *ext_idx)
+{
+ ext4_fsblk_t block = idx_pblock(ext_idx);
+ struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
+ if (unlikely(block < le32_to_cpu(es->s_first_data_block) ||
+ (block >= ext4_blocks_count(es))))
+ return 0;
+ else
+ return 1;
+}
+
+static int ext4_valid_extent_entries(struct inode *inode,
+ struct ext4_extent_header *eh,
+ int depth)
+{
+ struct ext4_extent *ext;
+ struct ext4_extent_idx *ext_idx;
+ unsigned short entries;
+ if (eh->eh_entries == 0)
+ return 1;
+
+ entries = le16_to_cpu(eh->eh_entries);
+
+ if (depth == 0) {
+ /* leaf entries */
+ ext = EXT_FIRST_EXTENT(eh);
+ while (entries) {
+ if (!ext4_valid_extent(inode, ext))
+ return 0;
+ ext++;
+ entries--;
+ }
+ } else {
+ ext_idx = EXT_FIRST_INDEX(eh);
+ while (entries) {
+ if (!ext4_valid_extent_idx(inode, ext_idx))
+ return 0;
+ ext_idx++;
+ entries--;
+ }
+ }
+ return 1;
+}
+
+static int __ext4_ext_check(const char *function, struct inode *inode,
struct ext4_extent_header *eh,
int depth)
{
error_msg = "invalid eh_entries";
goto corrupted;
}
+ if (!ext4_valid_extent_entries(inode, eh, depth)) {
+ error_msg = "invalid extent entries";
+ goto corrupted;
+ }
return 0;
corrupted:
ext4_error(inode->i_sb, function,
- "bad header in inode #%lu: %s - magic %x, "
+ "bad header/extent in inode #%lu: %s - magic %x, "
"entries %u, max %u(%u), depth %u(%u)",
inode->i_ino, error_msg, le16_to_cpu(eh->eh_magic),
le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max),
return -EIO;
}
-#define ext4_ext_check_header(inode, eh, depth) \
- __ext4_ext_check_header(__func__, inode, eh, depth)
+#define ext4_ext_check(inode, eh, depth) \
+ __ext4_ext_check(__func__, inode, eh, depth)
+
+int ext4_ext_check_inode(struct inode *inode)
+{
+ return ext4_ext_check(inode, ext_inode_hdr(inode), ext_depth(inode));
+}
#ifdef EXT_DEBUG
static void ext4_ext_show_path(struct inode *inode, struct ext4_ext_path *path)
eh = ext_inode_hdr(inode);
depth = ext_depth(inode);
- if (ext4_ext_check_header(inode, eh, depth))
- return ERR_PTR(-EIO);
-
/* account possible depth increase */
if (!path) {
i = depth;
/* walk through the tree */
while (i) {
+ int need_to_validate = 0;
+
ext_debug("depth %d: num %d, max %d\n",
ppos, le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max));
path[ppos].p_depth = i;
path[ppos].p_ext = NULL;
- bh = sb_bread(inode->i_sb, path[ppos].p_block);
- if (!bh)
+ bh = sb_getblk(inode->i_sb, path[ppos].p_block);
+ if (unlikely(!bh))
goto err;
-
+ if (!bh_uptodate_or_lock(bh)) {
+ if (bh_submit_read(bh) < 0) {
+ put_bh(bh);
+ goto err;
+ }
+ /* validate the extent entries */
+ need_to_validate = 1;
+ }
eh = ext_block_hdr(bh);
ppos++;
BUG_ON(ppos > depth);
path[ppos].p_hdr = eh;
i--;
- if (ext4_ext_check_header(inode, eh, i))
+ if (need_to_validate && ext4_ext_check(inode, eh, i))
goto err;
}
return -EIO;
eh = ext_block_hdr(bh);
/* subtract from p_depth to get proper eh_depth */
- if (ext4_ext_check_header(inode, eh, path->p_depth - depth)) {
+ if (ext4_ext_check(inode, eh, path->p_depth - depth)) {
put_bh(bh);
return -EIO;
}
if (bh == NULL)
return -EIO;
eh = ext_block_hdr(bh);
- if (ext4_ext_check_header(inode, eh, path->p_depth - depth)) {
+ if (ext4_ext_check(inode, eh, path->p_depth - depth)) {
put_bh(bh);
return -EIO;
}
return -ENOMEM;
}
path[0].p_hdr = ext_inode_hdr(inode);
- if (ext4_ext_check_header(inode, path[0].p_hdr, depth)) {
+ if (ext4_ext_check(inode, path[0].p_hdr, depth)) {
err = -EIO;
goto out;
}
err = -EIO;
break;
}
- if (ext4_ext_check_header(inode, ext_block_hdr(bh),
+ if (ext4_ext_check(inode, ext_block_hdr(bh),
depth - i - 1)) {
err = -EIO;
break;
git.openpandora.org / pandora-kernel.git / blobdiff