From: Xiubo Li xiubli@redhat.com
stable inclusion from stable-v5.10.111 commit f4429786129648a8f4bb1e5faa143c4478cc5c4a category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5GL1Z
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit f639d9867eea647005dc824e0e24f39ffc50d4e4 ]
Reset the last_readdir at the same time, and add a comment explaining why we don't free last_readdir when dir_emit returns false.
Signed-off-by: Xiubo Li xiubli@redhat.com Reviewed-by: Jeff Layton jlayton@kernel.org Signed-off-by: Ilya Dryomov idryomov@gmail.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Reviewed-by: Wei Li liwei391@huawei.com --- fs/ceph/dir.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c index f63c1a090139..1fddb9cd3e88 100644 --- a/fs/ceph/dir.c +++ b/fs/ceph/dir.c @@ -478,8 +478,11 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx) 2 : (fpos_off(rde->offset) + 1); err = note_last_dentry(dfi, rde->name, rde->name_len, next_offset); - if (err) + if (err) { + ceph_mdsc_put_request(dfi->last_readdir); + dfi->last_readdir = NULL; return err; + } } else if (req->r_reply_info.dir_end) { dfi->next_offset = 2; /* keep last name */ @@ -520,6 +523,12 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx) if (!dir_emit(ctx, rde->name, rde->name_len, ceph_present_ino(inode->i_sb, le64_to_cpu(rde->inode.in->ino)), le32_to_cpu(rde->inode.in->mode) >> 12)) { + /* + * NOTE: Here no need to put the 'dfi->last_readdir', + * because when dir_emit stops us it's most likely + * doesn't have enough memory, etc. So for next readdir + * it will continue. + */ dout("filldir stopping us...\n"); return 0; }