Since find_dentry doesn't lock its dentry page, it can traverse intermediate bit positions consisting of a big dentry. For these bit positions, this patch fills the intermediate name length fields as zeros and skips them during look-up.
Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org> --- fs/f2fs/dir.c | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c index a34ebd8..71195f5 100644 --- a/fs/f2fs/dir.c +++ b/fs/f2fs/dir.c @@ -141,11 +141,15 @@ struct f2fs_dir_entry *find_target_dentry(struct f2fs_filename *fname, *max_slots = max_len; max_len = 0; - /* remain bug on condition */ - if (unlikely(!de->name_len)) - d->max = -1; - - bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); + /* + * While a large dentry is adding, it can traverse its valid bit + * positions, since find_entry does not lock its dentry page. + * In that case, let's skip the bit position. + */ + if (de_name.len == 0) + bit_pos++; + else + bit_pos += GET_DENTRY_SLOTS(de_name.len); } de = NULL; @@ -505,8 +509,12 @@ void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *d, memcpy(d->filename[bit_pos], name->name, name->len); de->ino = cpu_to_le32(ino); set_de_type(de, mode); - for (i = 0; i < slots; i++) + for (i = 0; i < slots; i++) { + /* fill zeros for intermediate name_len slots */ + if (i >= 1) + d->dentry[bit_pos + i].name_len = 0; test_and_set_bit_le(bit_pos + i, (void *)d->bitmap); + } } /* -- 2.1.1 ------------------------------------------------------------------------------ Don't Limit Your Business. Reach for the Cloud. GigeNET's Cloud Solutions provide you with the tools and support that you need to offload your IT needs and focus on growing your business. Configured For All Businesses. Start Your Cloud Today. https://www.gigenetcloud.com/ _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel