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ceph: return -EIO if read/write against filp that lost file locks

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After mds evicts session, file locks get lost sliently. It's not safe to
let programs continue to do read/write.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Yan, Zheng 2019-07-25 20:16:45 +08:00 committed by Ilya Dryomov
parent d468e729b7
commit ff5d913dfc
3 changed files with 29 additions and 8 deletions
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28
fs/ceph/caps.c
View File

@ -2570,8 +2570,13 @@ static void __take_cap_refs(struct ceph_inode_info *ci, int got,
*
* FIXME: how does a 0 return differ from -EAGAIN?
*/
enum {
NON_BLOCKING = 1,
CHECK_FILELOCK = 2,
};
static int try_get_cap_refs(struct inode *inode, int need, int want,
loff_t endoff, bool nonblock, int *got)
loff_t endoff, int flags, int *got)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
@ -2586,6 +2591,13 @@ static int try_get_cap_refs(struct inode *inode, int need, int want,
again:
spin_lock(&ci->i_ceph_lock);
if ((flags & CHECK_FILELOCK) &&
(ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK)) {
dout("try_get_cap_refs %p error filelock\n", inode);
ret = -EIO;
goto out_unlock;
}
/* make sure file is actually open */
file_wanted = __ceph_caps_file_wanted(ci);
if ((file_wanted & need) != need) {
@ -2647,7 +2659,7 @@ again:
* we can not call down_read() when
* task isn't in TASK_RUNNING state
*/
if (nonblock) {
if (flags & NON_BLOCKING) {
ret = -EAGAIN;
goto out_unlock;
}
@ -2752,7 +2764,8 @@ int ceph_try_get_caps(struct inode *inode, int need, int want,
if (ret < 0)
return ret;
ret = try_get_cap_refs(inode, need, want, 0, nonblock, got);
ret = try_get_cap_refs(inode, need, want, 0,
(nonblock ? NON_BLOCKING : 0), got);
return ret == -EAGAIN ? 0 : ret;
}
@ -2764,9 +2777,10 @@ int ceph_try_get_caps(struct inode *inode, int need, int want,
int ceph_get_caps(struct file *filp, int need, int want,
loff_t endoff, int *got, struct page **pinned_page)
{
struct ceph_file_info *fi = filp->private_data;
struct inode *inode = file_inode(filp);
struct ceph_inode_info *ci = ceph_inode(inode);
int _got, ret;
int ret, _got, flags;
ret = ceph_pool_perm_check(inode, need);
if (ret < 0)
@ -2776,17 +2790,19 @@ int ceph_get_caps(struct file *filp, int need, int want,
if (endoff > 0)
check_max_size(inode, endoff);
flags = atomic_read(&fi->num_locks) ? CHECK_FILELOCK : 0;
_got = 0;
ret = try_get_cap_refs(inode, need, want, endoff,
false, &_got);
flags, &_got);
if (ret == -EAGAIN)
continue;
if (!ret) {
DEFINE_WAIT_FUNC(wait, woken_wake_function);
add_wait_queue(&ci->i_cap_wq, &wait);
flags |= NON_BLOCKING;
while (!(ret = try_get_cap_refs(inode, need, want,
endoff, true, &_got))) {
endoff, flags, &_got))) {
if (signal_pending(current)) {
ret = -ERESTARTSYS;
break;

8
fs/ceph/locks.c
View File

@ -32,14 +32,18 @@ void __init ceph_flock_init(void)
static void ceph_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
{
struct inode *inode = file_inode(src->fl_file);
struct ceph_file_info *fi = dst->fl_file->private_data;
struct inode *inode = file_inode(dst->fl_file);
atomic_inc(&ceph_inode(inode)->i_filelock_ref);
atomic_inc(&fi->num_locks);
}
static void ceph_fl_release_lock(struct file_lock *fl)
{
struct ceph_file_info *fi = fl->fl_file->private_data;
struct inode *inode = file_inode(fl->fl_file);
struct ceph_inode_info *ci = ceph_inode(inode);
atomic_dec(&fi->num_locks);
if (atomic_dec_and_test(&ci->i_filelock_ref)) {
/* clear error when all locks are released */
spin_lock(&ci->i_ceph_lock);
@ -73,7 +77,7 @@ static int ceph_lock_message(u8 lock_type, u16 operation, struct inode *inode,
* window. Caller function will decrease the counter.
*/
fl->fl_ops = &ceph_fl_lock_ops;
atomic_inc(&ceph_inode(inode)->i_filelock_ref);
fl->fl_ops->fl_copy_lock(fl, NULL);
}
if (operation != CEPH_MDS_OP_SETFILELOCK || cmd == CEPH_LOCK_UNLOCK)

1
fs/ceph/super.h
View File

@ -707,6 +707,7 @@ struct ceph_file_info {
struct list_head rw_contexts;
errseq_t meta_err;
atomic_t num_locks;
};
struct ceph_dir_file_info {