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ext4: fix extent sanity checking code with AGGRESSIVE_TEST
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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: "Theodore Ts'o" <tytso@mit.edu>
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Theodore Ts'o committed Aug 28, 2009
1 parent a36b449 commit 55ad63b
Showing 1 changed file with 34 additions and 26 deletions.
60 changes: 34 additions & 26 deletions fs/ext4/extents.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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;
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;
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;
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;
if (size > 4)
size = 4;
#endif
}
return size;
}

Expand All @@ -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;
Expand All @@ -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;
Expand Down Expand Up @@ -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;
Expand Down Expand Up @@ -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);
Expand Down Expand Up @@ -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;
Expand Down Expand Up @@ -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);
Expand All @@ -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);

Expand Down Expand Up @@ -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);
}
}
Expand Down

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