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Commit 55ad63bf authored by Theodore Ts'o's avatar Theodore Ts'o
Browse files

ext4: fix extent sanity checking code with AGGRESSIVE_TEST 



The extents sanity-checking code depends on the ext4_ext_space_*()
functions returning the maximum alloable size for eh_max; however,
when the debugging #ifdef AGGRESSIVE_TEST is enabled to test the
extent tree handling code, this prevents a normally created ext4
filesystem from being mounted with the errors:

Aug 26 15:43:50 bsd086 kernel: [   96.070277] EXT4-fs error (device sda8): ext4_ext_check_inode: bad header/extent in inode #8: too large eh_max - magic f30a, entries 1, max 4(3), depth 0(0)
Aug 26 15:43:50 bsd086 kernel: [   96.070526] EXT4-fs (sda8): no journal found

Bug reported by Akira Fujita.

Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent a36b4498

fs/ext4/extents.c

+34 −26
Original line number Diff line number Diff line
@@ -229,57 +229,65 @@ ext4_ext_new_meta_block(handle_t *handle, struct inode *inode, 
	return newblock;

}



static int ext4_ext_space_block(struct inode *inode)

static inline int ext4_ext_space_block(struct inode *inode, int check)

{

	int size;



	size = (inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header))

			/ sizeof(struct ext4_extent);

	if (!check) {

#ifdef AGGRESSIVE_TEST

		if (size > 6)

			size = 6;

#endif

	}

	return size;

}



static int ext4_ext_space_block_idx(struct inode *inode)

static inline int ext4_ext_space_block_idx(struct inode *inode, int check)

{

	int size;



	size = (inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header))

			/ sizeof(struct ext4_extent_idx);

	if (!check) {

#ifdef AGGRESSIVE_TEST

		if (size > 5)

			size = 5;

#endif

	}

	return size;

}



static int ext4_ext_space_root(struct inode *inode)

static inline int ext4_ext_space_root(struct inode *inode, int check)

{

	int size;



	size = sizeof(EXT4_I(inode)->i_data);

	size -= sizeof(struct ext4_extent_header);

	size /= sizeof(struct ext4_extent);

	if (!check) {

#ifdef AGGRESSIVE_TEST

		if (size > 3)

			size = 3;

#endif

	}

	return size;

}



static int ext4_ext_space_root_idx(struct inode *inode)

static inline int ext4_ext_space_root_idx(struct inode *inode, int check)

{

	int size;



	size = sizeof(EXT4_I(inode)->i_data);

	size -= sizeof(struct ext4_extent_header);

	size /= sizeof(struct ext4_extent_idx);

	if (!check) {

#ifdef AGGRESSIVE_TEST

		if (size > 4)

			size = 4;

#endif

	}

	return size;

}
@@ -293,9 +301,9 @@ int ext4_ext_calc_metadata_amount(struct inode *inode, int blocks) 
	int lcap, icap, rcap, leafs, idxs, num;

	int newextents = blocks;



	rcap = ext4_ext_space_root_idx(inode);

	lcap = ext4_ext_space_block(inode);

	icap = ext4_ext_space_block_idx(inode);

	rcap = ext4_ext_space_root_idx(inode, 0);

	lcap = ext4_ext_space_block(inode, 0);

	icap = ext4_ext_space_block_idx(inode, 0);



	/* number of new leaf blocks needed */

	num = leafs = (newextents + lcap - 1) / lcap;
@@ -320,14 +328,14 @@ ext4_ext_max_entries(struct inode *inode, int depth) 


	if (depth == ext_depth(inode)) {

		if (depth == 0)

			max = ext4_ext_space_root(inode);

			max = ext4_ext_space_root(inode, 1);

		else

			max = ext4_ext_space_root_idx(inode);

			max = ext4_ext_space_root_idx(inode, 1);

	} else {

		if (depth == 0)

			max = ext4_ext_space_block(inode);

			max = ext4_ext_space_block(inode, 1);

		else

			max = ext4_ext_space_block_idx(inode);

			max = ext4_ext_space_block_idx(inode, 1);

	}



	return max;
@@ -626,7 +634,7 @@ int ext4_ext_tree_init(handle_t *handle, struct inode *inode) 
	eh->eh_depth = 0;

	eh->eh_entries = 0;

	eh->eh_magic = EXT4_EXT_MAGIC;

	eh->eh_max = cpu_to_le16(ext4_ext_space_root(inode));

	eh->eh_max = cpu_to_le16(ext4_ext_space_root(inode, 0));

	ext4_mark_inode_dirty(handle, inode);

	ext4_ext_invalidate_cache(inode);

	return 0;
@@ -851,7 +859,7 @@ static int ext4_ext_split(handle_t *handle, struct inode *inode, 


	neh = ext_block_hdr(bh);

	neh->eh_entries = 0;

	neh->eh_max = cpu_to_le16(ext4_ext_space_block(inode));

	neh->eh_max = cpu_to_le16(ext4_ext_space_block(inode, 0));

	neh->eh_magic = EXT4_EXT_MAGIC;

	neh->eh_depth = 0;

	ex = EXT_FIRST_EXTENT(neh);
@@ -927,7 +935,7 @@ static int ext4_ext_split(handle_t *handle, struct inode *inode, 
		neh = ext_block_hdr(bh);

		neh->eh_entries = cpu_to_le16(1);

		neh->eh_magic = EXT4_EXT_MAGIC;

		neh->eh_max = cpu_to_le16(ext4_ext_space_block_idx(inode));

		neh->eh_max = cpu_to_le16(ext4_ext_space_block_idx(inode, 0));

		neh->eh_depth = cpu_to_le16(depth - i);

		fidx = EXT_FIRST_INDEX(neh);

		fidx->ei_block = border;
@@ -1052,9 +1060,9 @@ static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode, 
	/* old root could have indexes or leaves

	 * so calculate e_max right way */

	if (ext_depth(inode))

	  neh->eh_max = cpu_to_le16(ext4_ext_space_block_idx(inode));

		neh->eh_max = cpu_to_le16(ext4_ext_space_block_idx(inode, 0));

	else

	  neh->eh_max = cpu_to_le16(ext4_ext_space_block(inode));

		neh->eh_max = cpu_to_le16(ext4_ext_space_block(inode, 0));

	neh->eh_magic = EXT4_EXT_MAGIC;

	set_buffer_uptodate(bh);

	unlock_buffer(bh);
@@ -1069,7 +1077,7 @@ static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode, 
		goto out;



	curp->p_hdr->eh_magic = EXT4_EXT_MAGIC;

	curp->p_hdr->eh_max = cpu_to_le16(ext4_ext_space_root_idx(inode));

	curp->p_hdr->eh_max = cpu_to_le16(ext4_ext_space_root_idx(inode, 0));

	curp->p_hdr->eh_entries = cpu_to_le16(1);

	curp->p_idx = EXT_FIRST_INDEX(curp->p_hdr);
@@ -2348,7 +2356,7 @@ static int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start) 
		if (err == 0) {

			ext_inode_hdr(inode)->eh_depth = 0;

			ext_inode_hdr(inode)->eh_max =

				cpu_to_le16(ext4_ext_space_root(inode));

				cpu_to_le16(ext4_ext_space_root(inode, 0));

			err = ext4_ext_dirty(handle, inode, path);

		}

	}