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authorTheodore Ts'o <tytso@mit.edu>2014-09-01 14:40:09 -0400
committerTheodore Ts'o <tytso@mit.edu>2014-09-01 14:40:09 -0400
commit10809df84a4d868db61af621bae3658494165279 (patch)
tree07058f847b286c07f27c82033e7b2d8c0fc1af7a
parentb7ea89ad0a6b855172158a999d3f5008403f4011 (diff)
ext4: teach ext4_ext_find_extent() to realloc path if necessary
This adds additional safety in case for some reason we end reusing a path structure which isn't big enough for current depth of the inode. Signed-off-by: Theodore Ts'o <tytso@mit.edu>
-rw-r--r--fs/ext4/ext4_extents.h1
-rw-r--r--fs/ext4/extents.c20
2 files changed, 11 insertions, 10 deletions
diff --git a/fs/ext4/ext4_extents.h b/fs/ext4/ext4_extents.h
index a867f5ca9991..3c9381547094 100644
--- a/fs/ext4/ext4_extents.h
+++ b/fs/ext4/ext4_extents.h
@@ -123,6 +123,7 @@ find_ext4_extent_tail(struct ext4_extent_header *eh)
struct ext4_ext_path {
ext4_fsblk_t p_block;
__u16 p_depth;
+ __u16 p_maxdepth;
struct ext4_extent *p_ext;
struct ext4_extent_idx *p_idx;
struct ext4_extent_header *p_hdr;
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 538f9a4d96ff..c94c7480053e 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -869,14 +869,20 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
eh = ext_inode_hdr(inode);
depth = ext_depth(inode);
- if (path)
+ if (path) {
ext4_ext_drop_refs(path);
- else {
+ if (depth > path[0].p_maxdepth) {
+ kfree(path);
+ *orig_path = path = NULL;
+ }
+ }
+ if (!path) {
/* account possible depth increase */
path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 2),
GFP_NOFS);
if (unlikely(!path))
return ERR_PTR(-ENOMEM);
+ path[0].p_maxdepth = depth + 1;
}
path[0].p_hdr = eh;
path[0].p_bh = NULL;
@@ -1820,6 +1826,7 @@ static void ext4_ext_try_to_merge_up(handle_t *handle,
sizeof(struct ext4_extent_idx);
s += sizeof(struct ext4_extent_header);
+ path[1].p_maxdepth = path[0].p_maxdepth;
memcpy(path[0].p_hdr, path[1].p_hdr, s);
path[0].p_depth = 0;
path[0].p_ext = EXT_FIRST_EXTENT(path[0].p_hdr) +
@@ -2150,12 +2157,6 @@ static int ext4_fill_fiemap_extents(struct inode *inode,
/* find extent for this block */
down_read(&EXT4_I(inode)->i_data_sem);
- if (path && ext_depth(inode) != depth) {
- /* depth was changed. we have to realloc path */
- kfree(path);
- path = NULL;
- }
-
path = ext4_ext_find_extent(inode, block, &path, 0);
if (IS_ERR(path)) {
up_read(&EXT4_I(inode)->i_data_sem);
@@ -2173,7 +2174,6 @@ static int ext4_fill_fiemap_extents(struct inode *inode,
}
ex = path[depth].p_ext;
next = ext4_ext_next_allocated_block(path);
- ext4_ext_drop_refs(path);
flags = 0;
exists = 0;
@@ -2897,7 +2897,7 @@ again:
ext4_journal_stop(handle);
return -ENOMEM;
}
- path[0].p_depth = depth;
+ path[0].p_maxdepth = path[0].p_depth = depth;
path[0].p_hdr = ext_inode_hdr(inode);
i = 0;