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AFS fixes

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Merge tag 'afs-fixes-20190117' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs

Pull AFS fixes from David Howells:
 "Here's a set of fixes for AFS:

   - Use struct_size() for kzalloc() size calculation.

   - When calling YFS.CreateFile rather than AFS.CreateFile, it is
     possible to create a file with a file lock already held. The
     default value indicating no lock required is actually -1, not 0.

   - Fix an oops in inode/vnode validation if the target inode doesn't
     have a server interest assigned (ie. a server that will notify us
     of changes by third parties).

   - Fix refcounting of keys in file locking.

   - Fix a race in refcounting asynchronous operations in the event of
     an error during request transmission. The provision of a dedicated
     function to get an extra ref on a call is split into a separate
     commit"

* tag 'afs-fixes-20190117' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
  afs: Fix race in async call refcounting
  afs: Provide a function to get a ref on a call
  afs: Fix key refcounting in file locking code
  afs: Don't set vnode->cb_s_break in afs_validate()
  afs: Set correct lock type for the yfs CreateFile
  afs: Use struct_size() in kzalloc()
This commit is contained in:
Linus Torvalds 2019-01-18 06:27:24 +12:00
commit a3a80255d5
7 changed files with 61 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/afs/flock.c
View File

@ -208,7 +208,7 @@ again:
/* The new front of the queue now owns the state variables. */
next = list_entry(vnode->pending_locks.next,
struct file_lock, fl_u.afs.link);
vnode->lock_key = afs_file_key(next->fl_file);
vnode->lock_key = key_get(afs_file_key(next->fl_file));
vnode->lock_type = (next->fl_type == F_RDLCK) ? AFS_LOCK_READ : AFS_LOCK_WRITE;
vnode->lock_state = AFS_VNODE_LOCK_WAITING_FOR_CB;
goto again;
@ -413,7 +413,7 @@ static void afs_dequeue_lock(struct afs_vnode *vnode, struct file_lock *fl)
/* The new front of the queue now owns the state variables. */
next = list_entry(vnode->pending_locks.next,
struct file_lock, fl_u.afs.link);
vnode->lock_key = afs_file_key(next->fl_file);
vnode->lock_key = key_get(afs_file_key(next->fl_file));
vnode->lock_type = (next->fl_type == F_RDLCK) ? AFS_LOCK_READ : AFS_LOCK_WRITE;
vnode->lock_state = AFS_VNODE_LOCK_WAITING_FOR_CB;
afs_lock_may_be_available(vnode);

3
fs/afs/inode.c
View File

@ -414,7 +414,6 @@ int afs_validate(struct afs_vnode *vnode, struct key *key)
} else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
valid = true;
} else {
vnode->cb_s_break = vnode->cb_interest->server->cb_s_break;
vnode->cb_v_break = vnode->volume->cb_v_break;
valid = false;
}
@ -546,6 +545,8 @@ void afs_evict_inode(struct inode *inode)
#endif
afs_put_permits(rcu_access_pointer(vnode->permit_cache));
key_put(vnode->lock_key);
vnode->lock_key = NULL;
_leave("");
}

11
fs/afs/protocol_yfs.h
View File

@ -161,3 +161,14 @@ struct yfs_xdr_YFSStoreVolumeStatus {
struct yfs_xdr_u64 max_quota;
struct yfs_xdr_u64 file_quota;
} __packed;
enum yfs_lock_type {
yfs_LockNone = -1,
yfs_LockRead = 0,
yfs_LockWrite = 1,
yfs_LockExtend = 2,
yfs_LockRelease = 3,
yfs_LockMandatoryRead = 0x100,
yfs_LockMandatoryWrite = 0x101,
yfs_LockMandatoryExtend = 0x102,
};

53
fs/afs/rxrpc.c
View File

@ -23,6 +23,7 @@ struct workqueue_struct *afs_async_calls;
static void afs_wake_up_call_waiter(struct sock *, struct rxrpc_call *, unsigned long);
static long afs_wait_for_call_to_complete(struct afs_call *, struct afs_addr_cursor *);
static void afs_wake_up_async_call(struct sock *, struct rxrpc_call *, unsigned long);
static void afs_delete_async_call(struct work_struct *);
static void afs_process_async_call(struct work_struct *);
static void afs_rx_new_call(struct sock *, struct rxrpc_call *, unsigned long);
static void afs_rx_discard_new_call(struct rxrpc_call *, unsigned long);
@ -203,20 +204,26 @@ void afs_put_call(struct afs_call *call)
}
}
static struct afs_call *afs_get_call(struct afs_call *call,
enum afs_call_trace why)
{
int u = atomic_inc_return(&call->usage);
trace_afs_call(call, why, u,
atomic_read(&call->net->nr_outstanding_calls),
__builtin_return_address(0));
return call;
}
/*
* Queue the call for actual work.
*/
static void afs_queue_call_work(struct afs_call *call)
{
if (call->type->work) {
int u = atomic_inc_return(&call->usage);
trace_afs_call(call, afs_call_trace_work, u,
atomic_read(&call->net->nr_outstanding_calls),
__builtin_return_address(0));
INIT_WORK(&call->work, call->type->work);
afs_get_call(call, afs_call_trace_work);
if (!queue_work(afs_wq, &call->work))
afs_put_call(call);
}
@ -398,6 +405,12 @@ long afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call,
}
}
/* If the call is going to be asynchronous, we need an extra ref for
* the call to hold itself so the caller need not hang on to its ref.
*/
if (call->async)
afs_get_call(call, afs_call_trace_get);
/* create a call */
rxcall = rxrpc_kernel_begin_call(call->net->socket, srx, call->key,
(unsigned long)call,
@ -438,15 +451,17 @@ long afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call,
goto error_do_abort;
}
/* at this point, an async call may no longer exist as it may have
* already completed */
if (call->async)
/* Note that at this point, we may have received the reply or an abort
* - and an asynchronous call may already have completed.
*/
if (call->async) {
afs_put_call(call);
return -EINPROGRESS;
}
return afs_wait_for_call_to_complete(call, ac);
error_do_abort:
call->state = AFS_CALL_COMPLETE;
if (ret != -ECONNABORTED) {
rxrpc_kernel_abort_call(call->net->socket, rxcall,
RX_USER_ABORT, ret, "KSD");
@ -463,8 +478,24 @@ error_do_abort:
error_kill_call:
if (call->type->done)
call->type->done(call);
afs_put_call(call);
/* We need to dispose of the extra ref we grabbed for an async call.
* The call, however, might be queued on afs_async_calls and we need to
* make sure we don't get any more notifications that might requeue it.
*/
if (call->rxcall) {
rxrpc_kernel_end_call(call->net->socket, call->rxcall);
call->rxcall = NULL;
}
if (call->async) {
if (cancel_work_sync(&call->async_work))
afs_put_call(call);
afs_put_call(call);
}
ac->error = ret;
call->state = AFS_CALL_COMPLETE;
afs_put_call(call);
_leave(" = %d", ret);
return ret;
}

4
fs/afs/server_list.c
View File

@ -42,9 +42,7 @@ struct afs_server_list *afs_alloc_server_list(struct afs_cell *cell,
if (vldb->fs_mask[i] & type_mask)
nr_servers++;
slist = kzalloc(sizeof(struct afs_server_list) +
sizeof(struct afs_server_entry) * nr_servers,
GFP_KERNEL);
slist = kzalloc(struct_size(slist, servers, nr_servers), GFP_KERNEL);
if (!slist)
goto error;

2
fs/afs/yfsclient.c
View File

@ -803,7 +803,7 @@ int yfs_fs_create_file(struct afs_fs_cursor *fc,
bp = xdr_encode_YFSFid(bp, &vnode->fid);
bp = xdr_encode_string(bp, name, namesz);
bp = xdr_encode_YFSStoreStatus_mode(bp, mode);
bp = xdr_encode_u32(bp, 0); /* ViceLockType */
bp = xdr_encode_u32(bp, yfs_LockNone); /* ViceLockType */
yfs_check_req(call, bp);
afs_use_fs_server(call, fc->cbi);

2
include/trace/events/afs.h
View File

@ -25,6 +25,7 @@
enum afs_call_trace {
afs_call_trace_alloc,
afs_call_trace_free,
afs_call_trace_get,
afs_call_trace_put,
afs_call_trace_wake,
afs_call_trace_work,
@ -159,6 +160,7 @@ enum afs_file_error {
#define afs_call_traces \
EM(afs_call_trace_alloc, "ALLOC") \
EM(afs_call_trace_free, "FREE ") \
EM(afs_call_trace_get, "GET ") \
EM(afs_call_trace_put, "PUT ") \
EM(afs_call_trace_wake, "WAKE ") \
E_(afs_call_trace_work, "WORK ")