linux/fs/coda/upcall.c

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/*
* Mostly platform independent upcall operations to Venus:
* -- upcalls
* -- upcall routines
*
* Linux 2.0 version
* Copyright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk>,
* Michael Callahan <callahan@maths.ox.ac.uk>
*
* Redone for Linux 2.1
* Copyright (C) 1997 Carnegie Mellon University
*
* Carnegie Mellon University encourages users of this code to contribute
* improvements to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>.
*/
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/time.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/string.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/vfs.h>
#include <linux/coda.h>
#include <linux/coda_psdev.h>
#include "coda_linux.h"
#include "coda_cache.h"
#include "coda_int.h"
static int coda_upcall(struct venus_comm *vc, int inSize, int *outSize,
union inputArgs *buffer);
static void *alloc_upcall(int opcode, int size)
{
union inputArgs *inp;
CODA_ALLOC(inp, union inputArgs *, size);
if (!inp)
return ERR_PTR(-ENOMEM);
inp->ih.opcode = opcode;
inp->ih.pid = task_pid_nr_ns(current, &init_pid_ns);
inp->ih.pgid = task_pgrp_nr_ns(current, &init_pid_ns);
inp->ih.uid = from_kuid(&init_user_ns, current_fsuid());
return (void*)inp;
}
#define UPARG(op)\
do {\
inp = (union inputArgs *)alloc_upcall(op, insize); \
if (IS_ERR(inp)) { return PTR_ERR(inp); }\
outp = (union outputArgs *)(inp); \
outsize = insize; \
} while (0)
#define INSIZE(tag) sizeof(struct coda_ ## tag ## _in)
#define OUTSIZE(tag) sizeof(struct coda_ ## tag ## _out)
#define SIZE(tag) max_t(unsigned int, INSIZE(tag), OUTSIZE(tag))
/* the upcalls */
int venus_rootfid(struct super_block *sb, struct CodaFid *fidp)
{
union inputArgs *inp;
union outputArgs *outp;
int insize, outsize, error;
insize = SIZE(root);
UPARG(CODA_ROOT);
error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
if (!error)
*fidp = outp->coda_root.VFid;
CODA_FREE(inp, insize);
return error;
}
int venus_getattr(struct super_block *sb, struct CodaFid *fid,
struct coda_vattr *attr)
{
union inputArgs *inp;
union outputArgs *outp;
int insize, outsize, error;
insize = SIZE(getattr);
UPARG(CODA_GETATTR);
inp->coda_getattr.VFid = *fid;
error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
if (!error)
*attr = outp->coda_getattr.attr;
CODA_FREE(inp, insize);
return error;
}
int venus_setattr(struct super_block *sb, struct CodaFid *fid,
struct coda_vattr *vattr)
{
union inputArgs *inp;
union outputArgs *outp;
int insize, outsize, error;
insize = SIZE(setattr);
UPARG(CODA_SETATTR);
inp->coda_setattr.VFid = *fid;
inp->coda_setattr.attr = *vattr;
error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
CODA_FREE(inp, insize);
return error;
}
int venus_lookup(struct super_block *sb, struct CodaFid *fid,
const char *name, int length, int * type,
struct CodaFid *resfid)
{
union inputArgs *inp;
union outputArgs *outp;
int insize, outsize, error;
int offset;
offset = INSIZE(lookup);
insize = max_t(unsigned int, offset + length +1, OUTSIZE(lookup));
UPARG(CODA_LOOKUP);
inp->coda_lookup.VFid = *fid;
inp->coda_lookup.name = offset;
inp->coda_lookup.flags = CLU_CASE_SENSITIVE;
/* send Venus a null terminated string */
memcpy((char *)(inp) + offset, name, length);
*((char *)inp + offset + length) = '\0';
error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
if (!error) {
*resfid = outp->coda_lookup.VFid;
*type = outp->coda_lookup.vtype;
}
CODA_FREE(inp, insize);
return error;
}
int venus_close(struct super_block *sb, struct CodaFid *fid, int flags,
kuid_t uid)
{
union inputArgs *inp;
union outputArgs *outp;
int insize, outsize, error;
insize = SIZE(release);
UPARG(CODA_CLOSE);
inp->ih.uid = from_kuid(&init_user_ns, uid);
inp->coda_close.VFid = *fid;
inp->coda_close.flags = flags;
error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
CODA_FREE(inp, insize);
return error;
}
int venus_open(struct super_block *sb, struct CodaFid *fid,
int flags, struct file **fh)
{
union inputArgs *inp;
union outputArgs *outp;
int insize, outsize, error;
insize = SIZE(open_by_fd);
UPARG(CODA_OPEN_BY_FD);
inp->coda_open_by_fd.VFid = *fid;
inp->coda_open_by_fd.flags = flags;
error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
if (!error)
*fh = outp->coda_open_by_fd.fh;
CODA_FREE(inp, insize);
return error;
}
int venus_mkdir(struct super_block *sb, struct CodaFid *dirfid,
const char *name, int length,
struct CodaFid *newfid, struct coda_vattr *attrs)
{
union inputArgs *inp;
union outputArgs *outp;
int insize, outsize, error;
int offset;
offset = INSIZE(mkdir);
insize = max_t(unsigned int, offset + length + 1, OUTSIZE(mkdir));
UPARG(CODA_MKDIR);
inp->coda_mkdir.VFid = *dirfid;
inp->coda_mkdir.attr = *attrs;
inp->coda_mkdir.name = offset;
/* Venus must get null terminated string */
memcpy((char *)(inp) + offset, name, length);
*((char *)inp + offset + length) = '\0';
error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
if (!error) {
*attrs = outp->coda_mkdir.attr;
*newfid = outp->coda_mkdir.VFid;
}
CODA_FREE(inp, insize);
return error;
}
int venus_rename(struct super_block *sb, struct CodaFid *old_fid,
struct CodaFid *new_fid, size_t old_length,
size_t new_length, const char *old_name,
const char *new_name)
{
union inputArgs *inp;
union outputArgs *outp;
int insize, outsize, error;
int offset, s;
offset = INSIZE(rename);
insize = max_t(unsigned int, offset + new_length + old_length + 8,
OUTSIZE(rename));
UPARG(CODA_RENAME);
inp->coda_rename.sourceFid = *old_fid;
inp->coda_rename.destFid = *new_fid;
inp->coda_rename.srcname = offset;
/* Venus must receive an null terminated string */
s = ( old_length & ~0x3) +4; /* round up to word boundary */
memcpy((char *)(inp) + offset, old_name, old_length);
*((char *)inp + offset + old_length) = '\0';
/* another null terminated string for Venus */
offset += s;
inp->coda_rename.destname = offset;
s = ( new_length & ~0x3) +4; /* round up to word boundary */
memcpy((char *)(inp) + offset, new_name, new_length);
*((char *)inp + offset + new_length) = '\0';
error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
CODA_FREE(inp, insize);
return error;
}
int venus_create(struct super_block *sb, struct CodaFid *dirfid,
const char *name, int length, int excl, int mode,
struct CodaFid *newfid, struct coda_vattr *attrs)
{
union inputArgs *inp;
union outputArgs *outp;
int insize, outsize, error;
int offset;
offset = INSIZE(create);
insize = max_t(unsigned int, offset + length + 1, OUTSIZE(create));
UPARG(CODA_CREATE);
inp->coda_create.VFid = *dirfid;
inp->coda_create.attr.va_mode = mode;
inp->coda_create.excl = excl;
inp->coda_create.mode = mode;
inp->coda_create.name = offset;
/* Venus must get null terminated string */
memcpy((char *)(inp) + offset, name, length);
*((char *)inp + offset + length) = '\0';
error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
if (!error) {
*attrs = outp->coda_create.attr;
*newfid = outp->coda_create.VFid;
}
CODA_FREE(inp, insize);
return error;
}
int venus_rmdir(struct super_block *sb, struct CodaFid *dirfid,
const char *name, int length)
{
union inputArgs *inp;
union outputArgs *outp;
int insize, outsize, error;
int offset;
offset = INSIZE(rmdir);
insize = max_t(unsigned int, offset + length + 1, OUTSIZE(rmdir));
UPARG(CODA_RMDIR);
inp->coda_rmdir.VFid = *dirfid;
inp->coda_rmdir.name = offset;
memcpy((char *)(inp) + offset, name, length);
*((char *)inp + offset + length) = '\0';
error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
CODA_FREE(inp, insize);
return error;
}
int venus_remove(struct super_block *sb, struct CodaFid *dirfid,
const char *name, int length)
{
union inputArgs *inp;
union outputArgs *outp;
int error=0, insize, outsize, offset;
offset = INSIZE(remove);
insize = max_t(unsigned int, offset + length + 1, OUTSIZE(remove));
UPARG(CODA_REMOVE);
inp->coda_remove.VFid = *dirfid;
inp->coda_remove.name = offset;
memcpy((char *)(inp) + offset, name, length);
*((char *)inp + offset + length) = '\0';
error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
CODA_FREE(inp, insize);
return error;
}
int venus_readlink(struct super_block *sb, struct CodaFid *fid,
char *buffer, int *length)
{
union inputArgs *inp;
union outputArgs *outp;
int insize, outsize, error;
int retlen;
char *result;
insize = max_t(unsigned int,
INSIZE(readlink), OUTSIZE(readlink)+ *length);
UPARG(CODA_READLINK);
inp->coda_readlink.VFid = *fid;
error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
if (!error) {
retlen = outp->coda_readlink.count;
if (retlen >= *length)
retlen = *length - 1;
*length = retlen;
result = (char *)outp + (long)outp->coda_readlink.data;
memcpy(buffer, result, retlen);
*(buffer + retlen) = '\0';
}
CODA_FREE(inp, insize);
return error;
}
int venus_link(struct super_block *sb, struct CodaFid *fid,
struct CodaFid *dirfid, const char *name, int len )
{
union inputArgs *inp;
union outputArgs *outp;
int insize, outsize, error;
int offset;
offset = INSIZE(link);
insize = max_t(unsigned int, offset + len + 1, OUTSIZE(link));
UPARG(CODA_LINK);
inp->coda_link.sourceFid = *fid;
inp->coda_link.destFid = *dirfid;
inp->coda_link.tname = offset;
/* make sure strings are null terminated */
memcpy((char *)(inp) + offset, name, len);
*((char *)inp + offset + len) = '\0';
error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
CODA_FREE(inp, insize);
return error;
}
int venus_symlink(struct super_block *sb, struct CodaFid *fid,
const char *name, int len,
const char *symname, int symlen)
{
union inputArgs *inp;
union outputArgs *outp;
int insize, outsize, error;
int offset, s;
offset = INSIZE(symlink);
insize = max_t(unsigned int, offset + len + symlen + 8, OUTSIZE(symlink));
UPARG(CODA_SYMLINK);
/* inp->coda_symlink.attr = *tva; XXXXXX */
inp->coda_symlink.VFid = *fid;
/* Round up to word boundary and null terminate */
inp->coda_symlink.srcname = offset;
s = ( symlen & ~0x3 ) + 4;
memcpy((char *)(inp) + offset, symname, symlen);
*((char *)inp + offset + symlen) = '\0';
/* Round up to word boundary and null terminate */
offset += s;
inp->coda_symlink.tname = offset;
s = (len & ~0x3) + 4;
memcpy((char *)(inp) + offset, name, len);
*((char *)inp + offset + len) = '\0';
error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
CODA_FREE(inp, insize);
return error;
}
int venus_fsync(struct super_block *sb, struct CodaFid *fid)
{
union inputArgs *inp;
union outputArgs *outp;
int insize, outsize, error;
insize=SIZE(fsync);
UPARG(CODA_FSYNC);
inp->coda_fsync.VFid = *fid;
error = coda_upcall(coda_vcp(sb), sizeof(union inputArgs),
&outsize, inp);
CODA_FREE(inp, insize);
return error;
}
int venus_access(struct super_block *sb, struct CodaFid *fid, int mask)
{
union inputArgs *inp;
union outputArgs *outp;
int insize, outsize, error;
insize = SIZE(access);
UPARG(CODA_ACCESS);
inp->coda_access.VFid = *fid;
inp->coda_access.flags = mask;
error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
CODA_FREE(inp, insize);
return error;
}
int venus_pioctl(struct super_block *sb, struct CodaFid *fid,
unsigned int cmd, struct PioctlData *data)
{
union inputArgs *inp;
union outputArgs *outp;
int insize, outsize, error;
int iocsize;
insize = VC_MAXMSGSIZE;
UPARG(CODA_IOCTL);
/* build packet for Venus */
if (data->vi.in_size > VC_MAXDATASIZE) {
error = -EINVAL;
goto exit;
}
if (data->vi.out_size > VC_MAXDATASIZE) {
error = -EINVAL;
goto exit;
}
inp->coda_ioctl.VFid = *fid;
/* the cmd field was mutated by increasing its size field to
* reflect the path and follow args. We need to subtract that
* out before sending the command to Venus. */
inp->coda_ioctl.cmd = (cmd & ~(PIOCPARM_MASK << 16));
iocsize = ((cmd >> 16) & PIOCPARM_MASK) - sizeof(char *) - sizeof(int);
inp->coda_ioctl.cmd |= (iocsize & PIOCPARM_MASK) << 16;
/* in->coda_ioctl.rwflag = flag; */
inp->coda_ioctl.len = data->vi.in_size;
inp->coda_ioctl.data = (char *)(INSIZE(ioctl));
/* get the data out of user space */
if (copy_from_user((char *)inp + (long)inp->coda_ioctl.data,
data->vi.in, data->vi.in_size)) {
error = -EINVAL;
goto exit;
}
error = coda_upcall(coda_vcp(sb), SIZE(ioctl) + data->vi.in_size,
&outsize, inp);
if (error) {
pr_warn("%s: Venus returns: %d for %s\n",
__func__, error, coda_f2s(fid));
goto exit;
}
if (outsize < (long)outp->coda_ioctl.data + outp->coda_ioctl.len) {
error = -EINVAL;
goto exit;
}
/* Copy out the OUT buffer. */
if (outp->coda_ioctl.len > data->vi.out_size) {
error = -EINVAL;
goto exit;
}
/* Copy out the OUT buffer. */
if (copy_to_user(data->vi.out,
(char *)outp + (long)outp->coda_ioctl.data,
outp->coda_ioctl.len)) {
error = -EFAULT;
goto exit;
}
exit:
CODA_FREE(inp, insize);
return error;
}
int venus_statfs(struct dentry *dentry, struct kstatfs *sfs)
{
union inputArgs *inp;
union outputArgs *outp;
int insize, outsize, error;
insize = max_t(unsigned int, INSIZE(statfs), OUTSIZE(statfs));
UPARG(CODA_STATFS);
error = coda_upcall(coda_vcp(dentry->d_sb), insize, &outsize, inp);
if (!error) {
sfs->f_blocks = outp->coda_statfs.stat.f_blocks;
sfs->f_bfree = outp->coda_statfs.stat.f_bfree;
sfs->f_bavail = outp->coda_statfs.stat.f_bavail;
sfs->f_files = outp->coda_statfs.stat.f_files;
sfs->f_ffree = outp->coda_statfs.stat.f_ffree;
}
CODA_FREE(inp, insize);
return error;
}
/*
* coda_upcall and coda_downcall routines.
*/
static void coda_block_signals(sigset_t *old)
{
spin_lock_irq(&current->sighand->siglock);
*old = current->blocked;
sigfillset(&current->blocked);
sigdelset(&current->blocked, SIGKILL);
sigdelset(&current->blocked, SIGSTOP);
sigdelset(&current->blocked, SIGINT);
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
}
static void coda_unblock_signals(sigset_t *old)
{
spin_lock_irq(&current->sighand->siglock);
current->blocked = *old;
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
}
/* Don't allow signals to interrupt the following upcalls before venus
* has seen them,
* - CODA_CLOSE or CODA_RELEASE upcall (to avoid reference count problems)
* - CODA_STORE (to avoid data loss)
*/
#define CODA_INTERRUPTIBLE(r) (!coda_hard && \
(((r)->uc_opcode != CODA_CLOSE && \
(r)->uc_opcode != CODA_STORE && \
(r)->uc_opcode != CODA_RELEASE) || \
(r)->uc_flags & CODA_REQ_READ))
static inline void coda_waitfor_upcall(struct venus_comm *vcp,
struct upc_req *req)
{
DECLARE_WAITQUEUE(wait, current);
unsigned long timeout = jiffies + coda_timeout * HZ;
sigset_t old;
int blocked;
coda_block_signals(&old);
blocked = 1;
add_wait_queue(&req->uc_sleep, &wait);
for (;;) {
if (CODA_INTERRUPTIBLE(req))
set_current_state(TASK_INTERRUPTIBLE);
else
set_current_state(TASK_UNINTERRUPTIBLE);
/* got a reply */
if (req->uc_flags & (CODA_REQ_WRITE | CODA_REQ_ABORT))
break;
if (blocked && time_after(jiffies, timeout) &&
CODA_INTERRUPTIBLE(req))
{
coda_unblock_signals(&old);
blocked = 0;
}
if (signal_pending(current)) {
list_del(&req->uc_chain);
break;
}
mutex_unlock(&vcp->vc_mutex);
if (blocked)
schedule_timeout(HZ);
else
schedule();
mutex_lock(&vcp->vc_mutex);
}
if (blocked)
coda_unblock_signals(&old);
remove_wait_queue(&req->uc_sleep, &wait);
set_current_state(TASK_RUNNING);
}
/*
* coda_upcall will return an error in the case of
* failed communication with Venus _or_ will peek at Venus
* reply and return Venus' error.
*
* As venus has 2 types of errors, normal errors (positive) and internal
* errors (negative), normal errors are negated, while internal errors
* are all mapped to -EINTR, while showing a nice warning message. (jh)
*/
static int coda_upcall(struct venus_comm *vcp,
int inSize, int *outSize,
union inputArgs *buffer)
{
union outputArgs *out;
union inputArgs *sig_inputArgs;
struct upc_req *req = NULL, *sig_req;
int error;
mutex_lock(&vcp->vc_mutex);
if (!vcp->vc_inuse) {
pr_notice("Venus dead, not sending upcall\n");
error = -ENXIO;
goto exit;
}
/* Format the request message. */
req = kmalloc(sizeof(struct upc_req), GFP_KERNEL);
if (!req) {
error = -ENOMEM;
goto exit;
}
req->uc_data = (void *)buffer;
req->uc_flags = 0;
req->uc_inSize = inSize;
req->uc_outSize = *outSize ? *outSize : inSize;
req->uc_opcode = ((union inputArgs *)buffer)->ih.opcode;
req->uc_unique = ++vcp->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, &vcp->vc_pending);
wake_up_interruptible(&vcp->vc_waitq);
/* We can be interrupted while we wait for Venus to process
* our request. If the interrupt occurs before Venus has read
* the request, we dequeue and return. If it occurs after the
* read but before the reply, we dequeue, send a signal
* message, and return. If it occurs after the reply we ignore
* it. In no case do we want to restart the syscall. If it
* was interrupted by a venus shutdown (psdev_close), return
* ENODEV. */
/* Go to sleep. Wake up on signals only after the timeout. */
coda_waitfor_upcall(vcp, req);
/* Op went through, interrupt or not... */
if (req->uc_flags & CODA_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;
}
error = -EINTR;
if ((req->uc_flags & CODA_REQ_ABORT) || !signal_pending(current)) {
pr_warn("Unexpected interruption.\n");
goto exit;
}
/* Interrupted before venus read it. */
if (!(req->uc_flags & CODA_REQ_READ))
goto exit;
/* Venus saw the upcall, make sure we can send interrupt signal */
if (!vcp->vc_inuse) {
pr_info("Venus dead, not sending signal.\n");
goto exit;
}
error = -ENOMEM;
sig_req = kmalloc(sizeof(struct upc_req), GFP_KERNEL);
if (!sig_req) goto exit;
CODA_ALLOC((sig_req->uc_data), char *, sizeof(struct coda_in_hdr));
if (!sig_req->uc_data) {
kfree(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 = CODA_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), &vcp->vc_pending);
wake_up_interruptible(&vcp->vc_waitq);
exit:
kfree(req);
mutex_unlock(&vcp->vc_mutex);
return error;
}
/*
The statements below are part of the Coda opportunistic
programming -- taken from the Mach/BSD kernel code for Coda.
You don't get correct semantics by stating what needs to be
done without guaranteeing the invariants needed for it to happen.
When will be have time to find out what exactly is going on? (pjb)
*/
/*
* There are 7 cases where cache invalidations occur. The semantics
* of each is listed here:
*
* CODA_FLUSH -- flush all entries from the name cache and the cnode cache.
* CODA_PURGEUSER -- flush all entries from the name cache for a specific user
* This call is a result of token expiration.
*
* The next arise as the result of callbacks on a file or directory.
* CODA_ZAPFILE -- flush the cached attributes for a file.
* CODA_ZAPDIR -- flush the attributes for the dir and
* force a new lookup for all the children
of this dir.
*
* The next is a result of Venus detecting an inconsistent file.
* CODA_PURGEFID -- flush the attribute for the file
* purge it and its children from the dcache
*
* The last allows Venus to replace local fids with global ones
* during reintegration.
*
* CODA_REPLACE -- replace one CodaFid with another throughout the name cache */
int coda_downcall(struct venus_comm *vcp, int opcode, union outputArgs *out)
{
struct inode *inode = NULL;
struct CodaFid *fid = NULL, *newfid;
struct super_block *sb;
/* Handle invalidation requests. */
mutex_lock(&vcp->vc_mutex);
sb = vcp->vc_sb;
if (!sb || !sb->s_root)
goto unlock_out;
switch (opcode) {
case CODA_FLUSH:
coda_cache_clear_all(sb);
shrink_dcache_sb(sb);
if (d_really_is_positive(sb->s_root))
coda_flag_inode(d_inode(sb->s_root), C_FLUSH);
break;
case CODA_PURGEUSER:
coda_cache_clear_all(sb);
break;
case CODA_ZAPDIR:
fid = &out->coda_zapdir.CodaFid;
break;
case CODA_ZAPFILE:
fid = &out->coda_zapfile.CodaFid;
break;
case CODA_PURGEFID:
fid = &out->coda_purgefid.CodaFid;
break;
case CODA_REPLACE:
fid = &out->coda_replace.OldFid;
break;
}
if (fid)
inode = coda_fid_to_inode(fid, sb);
unlock_out:
mutex_unlock(&vcp->vc_mutex);
if (!inode)
return 0;
switch (opcode) {
case CODA_ZAPDIR:
coda_flag_inode_children(inode, C_PURGE);
coda_flag_inode(inode, C_VATTR);
break;
case CODA_ZAPFILE:
coda_flag_inode(inode, C_VATTR);
break;
case CODA_PURGEFID:
coda_flag_inode_children(inode, C_PURGE);
/* catch the dentries later if some are still busy */
coda_flag_inode(inode, C_PURGE);
d_prune_aliases(inode);
break;
case CODA_REPLACE:
newfid = &out->coda_replace.NewFid;
coda_replace_fid(inode, fid, newfid);
break;
}
iput(inode);
return 0;
}