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hfs: fix B-tree corruption after insertion at position 0

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Fix B-tree corruption when a new record is inserted at position 0 in the
node in hfs_brec_insert().

This is an identical change to the corresponding hfs b-tree code to Sergei
Antonov's "hfsplus: fix B-tree corruption after insertion at position 0",
to keep similar code paths in the hfs and hfsplus drivers in sync, where
appropriate.

Signed-off-by: Hin-Tak Leung <htl10@users.sourceforge.net>
Cc: Sergei Antonov <saproj@gmail.com>
Cc: Joe Perches <joe@perches.com>
Reviewed-by: Vyacheslav Dubeyko <slava@dubeyko.com>
Cc: Anton Altaparmakov <anton@tuxera.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hin-Tak Leung 2015-09-09 15:38:07 -07:00 committed by Linus Torvalds
parent 7cb74be6fd
commit b4cc0efea4
1 changed files with 11 additions and 9 deletions
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20
fs/hfs/brec.c
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@ -131,13 +131,16 @@ int hfs_brec_insert(struct hfs_find_data *fd, void *entry, int entry_len)
hfs_bnode_write(node, entry, data_off + key_len, entry_len);
hfs_bnode_dump(node);
if (new_node) {
/* update parent key if we inserted a key
* at the start of the first node
*/
if (!rec && new_node != node)
hfs_brec_update_parent(fd);
/*
* update parent key if we inserted a key
* at the start of the node and it is not the new node
*/
if (!rec && new_node != node) {
hfs_bnode_read_key(node, fd->search_key, data_off + size);
hfs_brec_update_parent(fd);
}
if (new_node) {
hfs_bnode_put(fd->bnode);
if (!new_node->parent) {
hfs_btree_inc_height(tree);
@ -166,9 +169,6 @@ int hfs_brec_insert(struct hfs_find_data *fd, void *entry, int entry_len)
goto again;
}
if (!rec)
hfs_brec_update_parent(fd);
return 0;
}
@ -366,6 +366,8 @@ static int hfs_brec_update_parent(struct hfs_find_data *fd)
if (IS_ERR(parent))
return PTR_ERR(parent);
__hfs_brec_find(parent, fd);
if (fd->record < 0)
return -ENOENT;
hfs_bnode_dump(parent);
rec = fd->record;