[PATCH 10/27] afs: Set error flag rather than return error from file status decode

From: David Howells
Date: Fri May 29 2020 - 18:01:30 EST

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Set a flag in the call struct to indicate an unmarshalling error rather
than return and handle an error from the decoding of file statuses. This
flag is checked on a successful return from the delivery function.

Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
---

fs/afs/fsclient.c | 88 +++++++++++++++-------------------------------------
fs/afs/internal.h | 1 +
fs/afs/rxrpc.c | 4 ++
fs/afs/yfsclient.c | 85 +++++++++++++++-----------------------------------
4 files changed, 55 insertions(+), 123 deletions(-)

diff --git a/fs/afs/fsclient.c b/fs/afs/fsclient.c
index 401de063996c..b1d8d8f780d2 100644
--- a/fs/afs/fsclient.c
+++ b/fs/afs/fsclient.c
@@ -56,16 +56,15 @@ static void xdr_dump_bad(const __be32 *bp)
/*
* decode an AFSFetchStatus block
*/
-static int xdr_decode_AFSFetchStatus(const __be32 **_bp,
- struct afs_call *call,
- struct afs_status_cb *scb)
+static void xdr_decode_AFSFetchStatus(const __be32 **_bp,
+ struct afs_call *call,
+ struct afs_status_cb *scb)
{
const struct afs_xdr_AFSFetchStatus *xdr = (const void *)*_bp;
struct afs_file_status *status = &scb->status;
bool inline_error = (call->operation_ID == afs_FS_InlineBulkStatus);
u64 data_version, size;
u32 type, abort_code;
- int ret;

abort_code = ntohl(xdr->abort_code);

@@ -79,7 +78,7 @@ static int xdr_decode_AFSFetchStatus(const __be32 **_bp,
*/
status->abort_code = abort_code;
scb->have_error = true;
- goto good;
+ goto advance;
}

pr_warn("Unknown AFSFetchStatus version %u\n", ntohl(xdr->if_version));
@@ -89,7 +88,7 @@ static int xdr_decode_AFSFetchStatus(const __be32 **_bp,
if (abort_code != 0 && inline_error) {
status->abort_code = abort_code;
scb->have_error = true;
- goto good;
+ goto advance;
}

type = ntohl(xdr->type);
@@ -125,15 +124,13 @@ static int xdr_decode_AFSFetchStatus(const __be32 **_bp,
data_version |= (u64)ntohl(xdr->data_version_hi) << 32;
status->data_version = data_version;
scb->have_status = true;
-good:
- ret = 0;
advance:
*_bp = (const void *)*_bp + sizeof(*xdr);
- return ret;
+ return;

bad:
xdr_dump_bad(*_bp);
- ret = afs_protocol_error(call, -EBADMSG, afs_eproto_bad_status);
+ afs_protocol_error(call, -EBADMSG, afs_eproto_bad_status);
goto advance;
}

@@ -254,9 +251,7 @@ static int afs_deliver_fs_fetch_status_vnode(struct afs_call *call)

/* unmarshall the reply once we've received all of it */
bp = call->buffer;
- ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
- if (ret < 0)
- return ret;
+ xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
xdr_decode_AFSCallBack(&bp, call, call->out_scb);
xdr_decode_AFSVolSync(&bp, call->out_volsync);

@@ -419,9 +414,7 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call)
return ret;

bp = call->buffer;
- ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
- if (ret < 0)
- return ret;
+ xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
xdr_decode_AFSCallBack(&bp, call, call->out_scb);
xdr_decode_AFSVolSync(&bp, call->out_volsync);

@@ -577,12 +570,8 @@ static int afs_deliver_fs_create_vnode(struct afs_call *call)
/* unmarshall the reply once we've received all of it */
bp = call->buffer;
xdr_decode_AFSFid(&bp, call->out_fid);
- ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
- if (ret < 0)
- return ret;
- ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_dir_scb);
- if (ret < 0)
- return ret;
+ xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
+ xdr_decode_AFSFetchStatus(&bp, call, call->out_dir_scb);
xdr_decode_AFSCallBack(&bp, call, call->out_scb);
xdr_decode_AFSVolSync(&bp, call->out_volsync);

@@ -691,9 +680,7 @@ static int afs_deliver_fs_dir_status_and_vol(struct afs_call *call)

/* unmarshall the reply once we've received all of it */
bp = call->buffer;
- ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_dir_scb);
- if (ret < 0)
- return ret;
+ xdr_decode_AFSFetchStatus(&bp, call, call->out_dir_scb);
xdr_decode_AFSVolSync(&bp, call->out_volsync);

_leave(" = 0 [done]");
@@ -784,12 +771,8 @@ static int afs_deliver_fs_link(struct afs_call *call)

/* unmarshall the reply once we've received all of it */
bp = call->buffer;
- ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
- if (ret < 0)
- return ret;
- ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_dir_scb);
- if (ret < 0)
- return ret;
+ xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
+ xdr_decode_AFSFetchStatus(&bp, call, call->out_dir_scb);
xdr_decode_AFSVolSync(&bp, call->out_volsync);

_leave(" = 0 [done]");
@@ -878,12 +861,8 @@ static int afs_deliver_fs_symlink(struct afs_call *call)
/* unmarshall the reply once we've received all of it */
bp = call->buffer;
xdr_decode_AFSFid(&bp, call->out_fid);
- ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
- if (ret < 0)
- return ret;
- ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_dir_scb);
- if (ret < 0)
- return ret;
+ xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
+ xdr_decode_AFSFetchStatus(&bp, call, call->out_dir_scb);
xdr_decode_AFSVolSync(&bp, call->out_volsync);

_leave(" = 0 [done]");
@@ -986,16 +965,12 @@ static int afs_deliver_fs_rename(struct afs_call *call)
if (ret < 0)
return ret;

+ bp = call->buffer;
/* If the two dirs are the same, we have two copies of the same status
* report, so we just decode it twice.
*/
- bp = call->buffer;
- ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_dir_scb);
- if (ret < 0)
- return ret;
- ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
- if (ret < 0)
- return ret;
+ xdr_decode_AFSFetchStatus(&bp, call, call->out_dir_scb);
+ xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
xdr_decode_AFSVolSync(&bp, call->out_volsync);

_leave(" = 0 [done]");
@@ -1103,9 +1078,7 @@ static int afs_deliver_fs_store_data(struct afs_call *call)

/* unmarshall the reply once we've received all of it */
bp = call->buffer;
- ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
- if (ret < 0)
- return ret;
+ xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
xdr_decode_AFSVolSync(&bp, call->out_volsync);

_leave(" = 0 [done]");
@@ -1283,9 +1256,7 @@ static int afs_deliver_fs_store_status(struct afs_call *call)

/* unmarshall the reply once we've received all of it */
bp = call->buffer;
- ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
- if (ret < 0)
- return ret;
+ xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
xdr_decode_AFSVolSync(&bp, call->out_volsync);

_leave(" = 0 [done]");
@@ -1952,9 +1923,7 @@ static int afs_deliver_fs_fetch_status(struct afs_call *call)

/* unmarshall the reply once we've received all of it */
bp = call->buffer;
- ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
- if (ret < 0)
- return ret;
+ xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
xdr_decode_AFSCallBack(&bp, call, call->out_scb);
xdr_decode_AFSVolSync(&bp, call->out_volsync);

@@ -2060,10 +2029,7 @@ static int afs_deliver_fs_inline_bulk_status(struct afs_call *call)

bp = call->buffer;
scb = &call->out_scb[call->count];
- ret = xdr_decode_AFSFetchStatus(&bp, call, scb);
- if (ret < 0)
- return ret;
-
+ xdr_decode_AFSFetchStatus(&bp, call, scb);
call->count++;
if (call->count < call->count2)
goto more_counts;
@@ -2241,9 +2207,7 @@ static int afs_deliver_fs_fetch_acl(struct afs_call *call)
return ret;

bp = call->buffer;
- ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
- if (ret < 0)
- return ret;
+ xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
xdr_decode_AFSVolSync(&bp, call->out_volsync);

call->unmarshall++;
@@ -2324,9 +2288,7 @@ static int afs_deliver_fs_file_status_and_vol(struct afs_call *call)
return ret;

bp = call->buffer;
- ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
- if (ret < 0)
- return ret;
+ xdr_decode_AFSFetchStatus(&bp, call, call->out_scb);
xdr_decode_AFSVolSync(&bp, call->out_volsync);

_leave(" = 0 [done]");
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index b6665fc5d355..6d5c66dd76de 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -160,6 +160,7 @@ struct afs_call {
bool upgrade; /* T to request service upgrade */
bool have_reply_time; /* T if have got reply_time */
bool intr; /* T if interruptible */
+ bool unmarshalling_error; /* T if an unmarshalling error occurred */
u16 service_id; /* Actual service ID (after upgrade) */
unsigned int debug_id; /* Trace ID */
u32 operation_ID; /* operation ID for an incoming call */
diff --git a/fs/afs/rxrpc.c b/fs/afs/rxrpc.c
index ab2962fff1fb..c84d571782d7 100644
--- a/fs/afs/rxrpc.c
+++ b/fs/afs/rxrpc.c
@@ -540,6 +540,8 @@ static void afs_deliver_to_call(struct afs_call *call)

ret = call->type->deliver(call);
state = READ_ONCE(call->state);
+ if (ret == 0 && call->unmarshalling_error)
+ ret = -EBADMSG;
switch (ret) {
case 0:
afs_queue_call_work(call);
@@ -963,5 +965,7 @@ noinline int afs_protocol_error(struct afs_call *call, int error,
enum afs_eproto_cause cause)
{
trace_afs_protocol_error(call, error, cause);
+ if (call)
+ call->unmarshalling_error = true;
return error;
}
diff --git a/fs/afs/yfsclient.c b/fs/afs/yfsclient.c
index fe413e7a5cf4..f118daa5f33a 100644
--- a/fs/afs/yfsclient.c
+++ b/fs/afs/yfsclient.c
@@ -179,21 +179,20 @@ static void xdr_dump_bad(const __be32 *bp)
/*
* Decode a YFSFetchStatus block
*/
-static int xdr_decode_YFSFetchStatus(const __be32 **_bp,
- struct afs_call *call,
- struct afs_status_cb *scb)
+static void xdr_decode_YFSFetchStatus(const __be32 **_bp,
+ struct afs_call *call,
+ struct afs_status_cb *scb)
{
const struct yfs_xdr_YFSFetchStatus *xdr = (const void *)*_bp;
struct afs_file_status *status = &scb->status;
u32 type;
- int ret;

status->abort_code = ntohl(xdr->abort_code);
if (status->abort_code != 0) {
if (status->abort_code == VNOVNODE)
status->nlink = 0;
scb->have_error = true;
- goto good;
+ goto advance;
}

type = ntohl(xdr->type);
@@ -221,15 +220,13 @@ static int xdr_decode_YFSFetchStatus(const __be32 **_bp,
status->size = xdr_to_u64(xdr->size);
status->data_version = xdr_to_u64(xdr->data_version);
scb->have_status = true;
-good:
- ret = 0;
advance:
*_bp += xdr_size(xdr);
- return ret;
+ return;

bad:
xdr_dump_bad(*_bp);
- ret = afs_protocol_error(call, -EBADMSG, afs_eproto_bad_status);
+ afs_protocol_error(call, -EBADMSG, afs_eproto_bad_status);
goto advance;
}

@@ -348,9 +345,7 @@ static int yfs_deliver_fs_status_cb_and_volsync(struct afs_call *call)

/* unmarshall the reply once we've received all of it */
bp = call->buffer;
- ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
- if (ret < 0)
- return ret;
+ xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
xdr_decode_YFSCallBack(&bp, call, call->out_scb);
xdr_decode_YFSVolSync(&bp, call->out_volsync);

@@ -372,9 +367,7 @@ static int yfs_deliver_status_and_volsync(struct afs_call *call)
return ret;

bp = call->buffer;
- ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
- if (ret < 0)
- return ret;
+ xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
xdr_decode_YFSVolSync(&bp, call->out_volsync);

_leave(" = 0 [done]");
@@ -534,9 +527,7 @@ static int yfs_deliver_fs_fetch_data64(struct afs_call *call)
return ret;

bp = call->buffer;
- ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
- if (ret < 0)
- return ret;
+ xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
xdr_decode_YFSCallBack(&bp, call, call->out_scb);
xdr_decode_YFSVolSync(&bp, call->out_volsync);

@@ -644,12 +635,8 @@ static int yfs_deliver_fs_create_vnode(struct afs_call *call)
/* unmarshall the reply once we've received all of it */
bp = call->buffer;
xdr_decode_YFSFid(&bp, call->out_fid);
- ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
- if (ret < 0)
- return ret;
- ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_dir_scb);
- if (ret < 0)
- return ret;
+ xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
+ xdr_decode_YFSFetchStatus(&bp, call, call->out_dir_scb);
xdr_decode_YFSCallBack(&bp, call, call->out_scb);
xdr_decode_YFSVolSync(&bp, call->out_volsync);

@@ -802,14 +789,9 @@ static int yfs_deliver_fs_remove_file2(struct afs_call *call)
return ret;

bp = call->buffer;
- ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_dir_scb);
- if (ret < 0)
- return ret;
-
+ xdr_decode_YFSFetchStatus(&bp, call, call->out_dir_scb);
xdr_decode_YFSFid(&bp, &fid);
- ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
- if (ret < 0)
- return ret;
+ xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
/* Was deleted if vnode->status.abort_code == VNOVNODE. */

xdr_decode_YFSVolSync(&bp, call->out_volsync);
@@ -889,10 +871,7 @@ static int yfs_deliver_fs_remove(struct afs_call *call)
return ret;

bp = call->buffer;
- ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_dir_scb);
- if (ret < 0)
- return ret;
-
+ xdr_decode_YFSFetchStatus(&bp, call, call->out_dir_scb);
xdr_decode_YFSVolSync(&bp, call->out_volsync);
return 0;
}
@@ -974,12 +953,8 @@ static int yfs_deliver_fs_link(struct afs_call *call)
return ret;

bp = call->buffer;
- ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
- if (ret < 0)
- return ret;
- ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_dir_scb);
- if (ret < 0)
- return ret;
+ xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
+ xdr_decode_YFSFetchStatus(&bp, call, call->out_dir_scb);
xdr_decode_YFSVolSync(&bp, call->out_volsync);
_leave(" = 0 [done]");
return 0;
@@ -1061,12 +1036,8 @@ static int yfs_deliver_fs_symlink(struct afs_call *call)
/* unmarshall the reply once we've received all of it */
bp = call->buffer;
xdr_decode_YFSFid(&bp, call->out_fid);
- ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
- if (ret < 0)
- return ret;
- ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_dir_scb);
- if (ret < 0)
- return ret;
+ xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
+ xdr_decode_YFSFetchStatus(&bp, call, call->out_dir_scb);
xdr_decode_YFSVolSync(&bp, call->out_volsync);

_leave(" = 0 [done]");
@@ -1154,13 +1125,11 @@ static int yfs_deliver_fs_rename(struct afs_call *call)
return ret;

bp = call->buffer;
- ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_dir_scb);
- if (ret < 0)
- return ret;
- ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
- if (ret < 0)
- return ret;
-
+ /* If the two dirs are the same, we have two copies of the same status
+ * report, so we just decode it twice.
+ */
+ xdr_decode_YFSFetchStatus(&bp, call, call->out_dir_scb);
+ xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
xdr_decode_YFSVolSync(&bp, call->out_volsync);
_leave(" = 0 [done]");
return 0;
@@ -1845,9 +1814,7 @@ static int yfs_deliver_fs_inline_bulk_status(struct afs_call *call)

bp = call->buffer;
scb = &call->out_scb[call->count];
- ret = xdr_decode_YFSFetchStatus(&bp, call, scb);
- if (ret < 0)
- return ret;
+ xdr_decode_YFSFetchStatus(&bp, call, scb);

call->count++;
if (call->count < call->count2)
@@ -2067,9 +2034,7 @@ static int yfs_deliver_fs_fetch_opaque_acl(struct afs_call *call)
bp = call->buffer;
yacl->inherit_flag = ntohl(*bp++);
yacl->num_cleaned = ntohl(*bp++);
- ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
- if (ret < 0)
- return ret;
+ xdr_decode_YFSFetchStatus(&bp, call, call->out_scb);
xdr_decode_YFSVolSync(&bp, call->out_volsync);

call->unmarshall++;

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Previous message: David Howells: "[PATCH 09/27] afs: Make callback processing more efficient."
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