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linux_dsm_epyc7002/include/trace/events/afs.h
David Howells 98bf40cd99 afs: Protect call->state changes against signals 
Protect call->state changes against the call being prematurely terminated
due to a signal.

What can happen is that a signal causes afs_wait_for_call_to_complete() to
abort an afs_call because it's not yet complete whilst afs_deliver_to_call()
is delivering data to that call.

If the data delivery causes the state to change, this may overwrite the state
of the afs_call, making it not-yet-complete again - but no further
notifications will be forthcoming from AF_RXRPC as the rxrpc call has been
aborted and completed, so kAFS will just hang in various places waiting for
that call or on page bits that need clearing by that call.

A tracepoint to monitor call state changes is also provided.

Signed-off-by: David Howells <dhowells@redhat.com>
2017-11-13 15:38:21 +00:00

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/* AFS tracepoints
*
* Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#undef TRACE_SYSTEM
#define TRACE_SYSTEM afs
#if !defined(_TRACE_AFS_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_AFS_H
#include <linux/tracepoint.h>
/*
* Define enums for tracing information.
*/
#ifndef __AFS_DECLARE_TRACE_ENUMS_ONCE_ONLY
#define __AFS_DECLARE_TRACE_ENUMS_ONCE_ONLY
enum afs_call_trace {
afs_call_trace_alloc,
afs_call_trace_free,
afs_call_trace_put,
afs_call_trace_wake,
afs_call_trace_work,
};
enum afs_fs_operation {
afs_FS_FetchData = 130, /* AFS Fetch file data */
afs_FS_FetchStatus = 132, /* AFS Fetch file status */
afs_FS_StoreData = 133, /* AFS Store file data */
afs_FS_StoreStatus = 135, /* AFS Store file status */
afs_FS_RemoveFile = 136, /* AFS Remove a file */
afs_FS_CreateFile = 137, /* AFS Create a file */
afs_FS_Rename = 138, /* AFS Rename or move a file or directory */
afs_FS_Symlink = 139, /* AFS Create a symbolic link */
afs_FS_Link = 140, /* AFS Create a hard link */
afs_FS_MakeDir = 141, /* AFS Create a directory */
afs_FS_RemoveDir = 142, /* AFS Remove a directory */
afs_FS_GetVolumeInfo = 148, /* AFS Get information about a volume */
afs_FS_GetVolumeStatus = 149, /* AFS Get volume status information */
afs_FS_GetRootVolume = 151, /* AFS Get root volume name */
afs_FS_SetLock = 156, /* AFS Request a file lock */
afs_FS_ExtendLock = 157, /* AFS Extend a file lock */
afs_FS_ReleaseLock = 158, /* AFS Release a file lock */
afs_FS_Lookup = 161, /* AFS lookup file in directory */
afs_FS_FetchData64 = 65537, /* AFS Fetch file data */
afs_FS_StoreData64 = 65538, /* AFS Store file data */
afs_FS_GiveUpAllCallBacks = 65539, /* AFS Give up all our callbacks on a server */
afs_FS_GetCapabilities = 65540, /* AFS Get FS server capabilities */
};
enum afs_vl_operation {
afs_VL_GetEntryByNameU = 527, /* AFS Get Vol Entry By Name operation ID */
afs_VL_GetAddrsU = 533, /* AFS Get FS server addresses */
afs_YFSVL_GetEndpoints = 64002, /* YFS Get FS & Vol server addresses */
afs_VL_GetCapabilities = 65537, /* AFS Get VL server capabilities */
};
#endif /* end __AFS_DECLARE_TRACE_ENUMS_ONCE_ONLY */
/*
* Declare tracing information enums and their string mappings for display.
*/
#define afs_call_traces \
EM(afs_call_trace_alloc, "ALLOC") \
EM(afs_call_trace_free, "FREE ") \
EM(afs_call_trace_put, "PUT ") \
EM(afs_call_trace_wake, "WAKE ") \
E_(afs_call_trace_work, "WORK ")
#define afs_fs_operations \
EM(afs_FS_FetchData, "FS.FetchData") \
EM(afs_FS_FetchStatus, "FS.FetchStatus") \
EM(afs_FS_StoreData, "FS.StoreData") \
EM(afs_FS_StoreStatus, "FS.StoreStatus") \
EM(afs_FS_RemoveFile, "FS.RemoveFile") \
EM(afs_FS_CreateFile, "FS.CreateFile") \
EM(afs_FS_Rename, "FS.Rename") \
EM(afs_FS_Symlink, "FS.Symlink") \
EM(afs_FS_Link, "FS.Link") \
EM(afs_FS_MakeDir, "FS.MakeDir") \
EM(afs_FS_RemoveDir, "FS.RemoveDir") \
EM(afs_FS_GetVolumeInfo, "FS.GetVolumeInfo") \
EM(afs_FS_GetVolumeStatus, "FS.GetVolumeStatus") \
EM(afs_FS_GetRootVolume, "FS.GetRootVolume") \
EM(afs_FS_SetLock, "FS.SetLock") \
EM(afs_FS_ExtendLock, "FS.ExtendLock") \
EM(afs_FS_ReleaseLock, "FS.ReleaseLock") \
EM(afs_FS_Lookup, "FS.Lookup") \
EM(afs_FS_FetchData64, "FS.FetchData64") \
EM(afs_FS_StoreData64, "FS.StoreData64") \
EM(afs_FS_GiveUpAllCallBacks, "FS.GiveUpAllCallBacks") \
E_(afs_FS_GetCapabilities, "FS.GetCapabilities")
#define afs_vl_operations \
EM(afs_VL_GetEntryByNameU, "VL.GetEntryByNameU") \
EM(afs_VL_GetAddrsU, "VL.GetAddrsU") \
EM(afs_YFSVL_GetEndpoints, "YFSVL.GetEndpoints") \
E_(afs_VL_GetCapabilities, "VL.GetCapabilities")
/*
* Export enum symbols via userspace.
*/
#undef EM
#undef E_
#define EM(a, b) TRACE_DEFINE_ENUM(a);
#define E_(a, b) TRACE_DEFINE_ENUM(a);
afs_call_traces;
afs_fs_operations;
afs_vl_operations;
/*
* Now redefine the EM() and E_() macros to map the enums to the strings that
* will be printed in the output.
*/
#undef EM
#undef E_
#define EM(a, b) { a, b },
#define E_(a, b) { a, b }
TRACE_EVENT(afs_recv_data,
TP_PROTO(struct afs_call *call, unsigned count, unsigned offset,
bool want_more, int ret),
TP_ARGS(call, count, offset, want_more, ret),
TP_STRUCT__entry(
__field(struct rxrpc_call *, rxcall )
__field(struct afs_call *, call )
__field(enum afs_call_state, state )
__field(unsigned int, count )
__field(unsigned int, offset )
__field(unsigned short, unmarshall )
__field(bool, want_more )
__field(int, ret )
),
TP_fast_assign(
__entry->rxcall = call->rxcall;
__entry->call = call;
__entry->state = call->state;
__entry->unmarshall = call->unmarshall;
__entry->count = count;
__entry->offset = offset;
__entry->want_more = want_more;
__entry->ret = ret;
),
TP_printk("c=%p ac=%p s=%u u=%u %u/%u wm=%u ret=%d",
__entry->rxcall,
__entry->call,
__entry->state, __entry->unmarshall,
__entry->offset, __entry->count,
__entry->want_more, __entry->ret)
);
TRACE_EVENT(afs_notify_call,
TP_PROTO(struct rxrpc_call *rxcall, struct afs_call *call),
TP_ARGS(rxcall, call),
TP_STRUCT__entry(
__field(struct rxrpc_call *, rxcall )
__field(struct afs_call *, call )
__field(enum afs_call_state, state )
__field(unsigned short, unmarshall )
),
TP_fast_assign(
__entry->rxcall = rxcall;
__entry->call = call;
__entry->state = call->state;
__entry->unmarshall = call->unmarshall;
),
TP_printk("c=%p ac=%p s=%u u=%u",
__entry->rxcall,
__entry->call,
__entry->state, __entry->unmarshall)
);
TRACE_EVENT(afs_cb_call,
TP_PROTO(struct afs_call *call),
TP_ARGS(call),
TP_STRUCT__entry(
__field(struct rxrpc_call *, rxcall )
__field(struct afs_call *, call )
__field(const char *, name )
__field(u32, op )
),
TP_fast_assign(
__entry->rxcall = call->rxcall;
__entry->call = call;
__entry->name = call->type->name;
__entry->op = call->operation_ID;
),
TP_printk("c=%p ac=%p %s o=%u",
__entry->rxcall,
__entry->call,
__entry->name,
__entry->op)
);
TRACE_EVENT(afs_call,
TP_PROTO(struct afs_call *call, enum afs_call_trace op,
int usage, int outstanding, const void *where),
TP_ARGS(call, op, usage, outstanding, where),
TP_STRUCT__entry(
__field(struct afs_call *, call )
__field(int, op )
__field(int, usage )
__field(int, outstanding )
__field(const void *, where )
),
TP_fast_assign(
__entry->call = call;
__entry->op = op;
__entry->usage = usage;
__entry->outstanding = outstanding;
__entry->where = where;
),
TP_printk("c=%p %s u=%d o=%d sp=%pSR",
__entry->call,
__print_symbolic(__entry->op, afs_call_traces),
__entry->usage,
__entry->outstanding,
__entry->where)
);
TRACE_EVENT(afs_make_fs_call,
TP_PROTO(struct afs_call *call, const struct afs_fid *fid),
TP_ARGS(call, fid),
TP_STRUCT__entry(
__field(struct afs_call *, call )
__field(enum afs_fs_operation, op )
__field_struct(struct afs_fid, fid )
),
TP_fast_assign(
__entry->call = call;
__entry->op = call->operation_ID;
if (fid) {
__entry->fid = *fid;
} else {
__entry->fid.vid = 0;
__entry->fid.vnode = 0;
__entry->fid.unique = 0;
}
),
TP_printk("c=%p %06x:%06x:%06x %s",
__entry->call,
__entry->fid.vid,
__entry->fid.vnode,
__entry->fid.unique,
__print_symbolic(__entry->op, afs_fs_operations))
);
TRACE_EVENT(afs_make_vl_call,
TP_PROTO(struct afs_call *call),
TP_ARGS(call),
TP_STRUCT__entry(
__field(struct afs_call *, call )
__field(enum afs_vl_operation, op )
),
TP_fast_assign(
__entry->call = call;
__entry->op = call->operation_ID;
),
TP_printk("c=%p %s",
__entry->call,
__print_symbolic(__entry->op, afs_vl_operations))
);
TRACE_EVENT(afs_call_done,
TP_PROTO(struct afs_call *call),
TP_ARGS(call),
TP_STRUCT__entry(
__field(struct afs_call *, call )
__field(struct rxrpc_call *, rx_call )
__field(int, ret )
__field(u32, abort_code )
),
TP_fast_assign(
__entry->call = call;
__entry->rx_call = call->rxcall;
__entry->ret = call->error;
__entry->abort_code = call->abort_code;
),
TP_printk(" c=%p ret=%d ab=%d [%p]",
__entry->call,
__entry->ret,
__entry->abort_code,
__entry->rx_call)
);
TRACE_EVENT(afs_send_pages,
TP_PROTO(struct afs_call *call, struct msghdr *msg,
pgoff_t first, pgoff_t last, unsigned int offset),
TP_ARGS(call, msg, first, last, offset),
TP_STRUCT__entry(
__field(struct afs_call *, call )
__field(pgoff_t, first )
__field(pgoff_t, last )
__field(unsigned int, nr )
__field(unsigned int, bytes )
__field(unsigned int, offset )
__field(unsigned int, flags )
),
TP_fast_assign(
__entry->call = call;
__entry->first = first;
__entry->last = last;
__entry->nr = msg->msg_iter.nr_segs;
__entry->bytes = msg->msg_iter.count;
__entry->offset = offset;
__entry->flags = msg->msg_flags;
),
TP_printk(" c=%p %lx-%lx-%lx b=%x o=%x f=%x",
__entry->call,
__entry->first, __entry->first + __entry->nr - 1, __entry->last,
__entry->bytes, __entry->offset,
__entry->flags)
);
TRACE_EVENT(afs_sent_pages,
TP_PROTO(struct afs_call *call, pgoff_t first, pgoff_t last,
pgoff_t cursor, int ret),
TP_ARGS(call, first, last, cursor, ret),
TP_STRUCT__entry(
__field(struct afs_call *, call )
__field(pgoff_t, first )
__field(pgoff_t, last )
__field(pgoff_t, cursor )
__field(int, ret )
),
TP_fast_assign(
__entry->call = call;
__entry->first = first;
__entry->last = last;
__entry->cursor = cursor;
__entry->ret = ret;
),
TP_printk(" c=%p %lx-%lx c=%lx r=%d",
__entry->call,
__entry->first, __entry->last,
__entry->cursor, __entry->ret)
);
TRACE_EVENT(afs_dir_check_failed,
TP_PROTO(struct afs_vnode *vnode, loff_t off, loff_t i_size),
TP_ARGS(vnode, off, i_size),
TP_STRUCT__entry(
__field(struct afs_vnode *, vnode )
__field(loff_t, off )
__field(loff_t, i_size )
),
TP_fast_assign(
__entry->vnode = vnode;
__entry->off = off;
__entry->i_size = i_size;
),
TP_printk("vn=%p %llx/%llx",
__entry->vnode, __entry->off, __entry->i_size)
);
/*
* We use page->private to hold the amount of the page that we've written to,
* splitting the field into two parts. However, we need to represent a range
* 0...PAGE_SIZE inclusive, so we can't support 64K pages on a 32-bit system.
*/
#if PAGE_SIZE > 32768
#define AFS_PRIV_MAX 0xffffffff
#define AFS_PRIV_SHIFT 32
#else
#define AFS_PRIV_MAX 0xffff
#define AFS_PRIV_SHIFT 16
#endif
TRACE_EVENT(afs_page_dirty,
TP_PROTO(struct afs_vnode *vnode, const char *where,
pgoff_t page, unsigned long priv),
TP_ARGS(vnode, where, page, priv),
TP_STRUCT__entry(
__field(struct afs_vnode *, vnode )
__field(const char *, where )
__field(pgoff_t, page )
__field(unsigned long, priv )
),
TP_fast_assign(
__entry->vnode = vnode;
__entry->where = where;
__entry->page = page;
__entry->priv = priv;
),
TP_printk("vn=%p %lx %s %lu-%lu",
__entry->vnode, __entry->page, __entry->where,
__entry->priv & AFS_PRIV_MAX,
__entry->priv >> AFS_PRIV_SHIFT)
);
TRACE_EVENT(afs_call_state,
TP_PROTO(struct afs_call *call,
enum afs_call_state from,
enum afs_call_state to,
int ret, u32 remote_abort),
TP_ARGS(call, from, to, ret, remote_abort),
TP_STRUCT__entry(
__field(struct afs_call *, call )
__field(enum afs_call_state, from )
__field(enum afs_call_state, to )
__field(int, ret )
__field(u32, abort )
),
TP_fast_assign(
__entry->call = call;
__entry->from = from;
__entry->to = to;
__entry->ret = ret;
__entry->abort = remote_abort;
),
TP_printk("c=%p %u->%u r=%d ab=%d",
__entry->call,
__entry->from, __entry->to,
__entry->ret, __entry->abort)
);
#endif /* _TRACE_AFS_H */
/* This part must be outside protection */
#include <trace/define_trace.h>
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