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authorJan Harkes <jaharkes@cs.cmu.edu>2007-07-19 01:48:46 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-19 10:04:48 -0700
commitfe71b5f3871af2c281a08acd4bedd2da25e46bc3 (patch)
treecdd4eafff85d86d5495eb4f7c51cfbdf689ec78a /fs
parent87065519633af79e0577e32a58dcd9cf3c45a8a0 (diff)
downloadlinux-linaro-fe71b5f3871af2c281a08acd4bedd2da25e46bc3.tar.gz
coda: cleanup for upcall handling path
Make the code that processes upcall responses more straightforward, uncovered at least one bad assumption. We trusted that vc_inuse would be 0 when upcalls are aborted, however the device may have been reopened. Signed-off-by: Jan Harkes <jaharkes@cs.cmu.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/coda/upcall.c121
1 files changed, 58 insertions, 63 deletions
diff --git a/fs/coda/upcall.c b/fs/coda/upcall.c
index a44ca4155fd..44332efa841 100644
--- a/fs/coda/upcall.c
+++ b/fs/coda/upcall.c
@@ -687,27 +687,27 @@ static inline void coda_waitfor_upcall(struct upc_req *vmp)
* are all mapped to -EINTR, while showing a nice warning message. (jh)
*
*/
-static int coda_upcall(struct coda_sb_info *sbi,
- int inSize, int *outSize,
- union inputArgs *buffer)
+static int coda_upcall(struct coda_sb_info *sbi,
+ int inSize, int *outSize,
+ union inputArgs *buffer)
{
struct venus_comm *vcommp;
union outputArgs *out;
- struct upc_req *req;
+ union inputArgs *sig_inputArgs;
+ struct upc_req *req, *sig_req;
int error = 0;
vcommp = sbi->sbi_vcomm;
- if ( !vcommp->vc_inuse ) {
- printk("No pseudo device in upcall comms at %p\n", vcommp);
- return -ENXIO;
+ if (!vcommp->vc_inuse) {
+ printk(KERN_NOTICE "coda: Venus dead, not sending upcall\n");
+ return -ENXIO;
}
/* Format the request message. */
req = upc_alloc();
- if (!req) {
- printk("Failed to allocate upc_req structure\n");
+ if (!req)
return -ENOMEM;
- }
+
req->uc_data = (void *)buffer;
req->uc_flags = 0;
req->uc_inSize = inSize;
@@ -715,13 +715,13 @@ static int coda_upcall(struct coda_sb_info *sbi,
req->uc_opcode = ((union inputArgs *)buffer)->ih.opcode;
req->uc_unique = ++vcommp->vc_seq;
init_waitqueue_head(&req->uc_sleep);
-
+
/* Fill in the common input args. */
((union inputArgs *)buffer)->ih.unique = req->uc_unique;
/* Append msg to pending queue and poke Venus. */
- list_add_tail(&(req->uc_chain), &vcommp->vc_pending);
-
+ list_add_tail(&req->uc_chain, &vcommp->vc_pending);
+
wake_up_interruptible(&vcommp->vc_waitq);
/* We can be interrupted while we wait for Venus to process
* our request. If the interrupt occurs before Venus has read
@@ -735,64 +735,59 @@ static int coda_upcall(struct coda_sb_info *sbi,
/* Go to sleep. Wake up on signals only after the timeout. */
coda_waitfor_upcall(req);
- if (vcommp->vc_inuse) { /* i.e. Venus is still alive */
- /* Op went through, interrupt or not... */
- if (req->uc_flags & REQ_WRITE) {
+ /* Op went through, interrupt or not... */
+ if (req->uc_flags & REQ_WRITE) {
out = (union outputArgs *)req->uc_data;
/* here we map positive Venus errors to kernel errors */
error = -out->oh.result;
*outSize = req->uc_outSize;
goto exit;
- }
- if ( !(req->uc_flags & REQ_READ) && signal_pending(current)) {
- /* Interrupted before venus read it. */
- list_del(&(req->uc_chain));
- /* perhaps the best way to convince the app to
- give up? */
- error = -EINTR;
+ }
+
+ error = -EINTR;
+ if ((req->uc_flags & REQ_ABORT) || !signal_pending(current)) {
+ printk(KERN_WARNING "coda: Unexpected interruption.\n");
goto exit;
- }
- if ( (req->uc_flags & REQ_READ) && signal_pending(current) ) {
- /* interrupted after Venus did its read, send signal */
- union inputArgs *sig_inputArgs;
- struct upc_req *sig_req;
-
- list_del(&(req->uc_chain));
- error = -ENOMEM;
- sig_req = upc_alloc();
- if (!sig_req) goto exit;
-
- CODA_ALLOC((sig_req->uc_data), char *, sizeof(struct coda_in_hdr));
- if (!sig_req->uc_data) {
- upc_free(sig_req);
- goto exit;
- }
-
- error = -EINTR;
- sig_inputArgs = (union inputArgs *)sig_req->uc_data;
- sig_inputArgs->ih.opcode = CODA_SIGNAL;
- sig_inputArgs->ih.unique = req->uc_unique;
-
- sig_req->uc_flags = REQ_ASYNC;
- sig_req->uc_opcode = sig_inputArgs->ih.opcode;
- sig_req->uc_unique = sig_inputArgs->ih.unique;
- sig_req->uc_inSize = sizeof(struct coda_in_hdr);
- sig_req->uc_outSize = sizeof(struct coda_in_hdr);
-
- /* insert at head of queue! */
- list_add(&(sig_req->uc_chain), &vcommp->vc_pending);
- wake_up_interruptible(&vcommp->vc_waitq);
- } else {
- printk("Coda: Strange interruption..\n");
- error = -EINTR;
- }
- } else { /* If venus died i.e. !VC_OPEN(vcommp) */
- printk("coda_upcall: Venus dead on (op,un) (%d.%d) flags %d\n",
- req->uc_opcode, req->uc_unique, req->uc_flags);
- error = -ENODEV;
}
- exit:
+ list_del(&(req->uc_chain));
+
+ /* Interrupted before venus read it. */
+ if (!(req->uc_flags & REQ_READ))
+ goto exit;
+
+ /* Venus saw the upcall, make sure we can send interrupt signal */
+ if (!vcommp->vc_inuse) {
+ printk(KERN_INFO "coda: Venus dead, not sending signal.\n");
+ goto exit;
+ }
+
+ error = -ENOMEM;
+ sig_req = upc_alloc();
+ if (!sig_req) goto exit;
+
+ CODA_ALLOC((sig_req->uc_data), char *, sizeof(struct coda_in_hdr));
+ if (!sig_req->uc_data) {
+ upc_free(sig_req);
+ goto exit;
+ }
+
+ error = -EINTR;
+ sig_inputArgs = (union inputArgs *)sig_req->uc_data;
+ sig_inputArgs->ih.opcode = CODA_SIGNAL;
+ sig_inputArgs->ih.unique = req->uc_unique;
+
+ sig_req->uc_flags = REQ_ASYNC;
+ sig_req->uc_opcode = sig_inputArgs->ih.opcode;
+ sig_req->uc_unique = sig_inputArgs->ih.unique;
+ sig_req->uc_inSize = sizeof(struct coda_in_hdr);
+ sig_req->uc_outSize = sizeof(struct coda_in_hdr);
+
+ /* insert at head of queue! */
+ list_add(&(sig_req->uc_chain), &vcommp->vc_pending);
+ wake_up_interruptible(&vcommp->vc_waitq);
+
+exit:
upc_free(req);
return error;
}