extern struct vcache *afs_globalVp;
extern int afs_notify_change(struct dentry *dp, struct iattr *iattrp);
-/* Some uses of BKL are perhaps not needed for bypass or memcache--
- * why don't we try it out? */
-extern struct afs_cacheOps afs_UfsCacheOps;
-
-static inline void
-afs_maybe_lock_kernel(void) {
- if(afs_cacheType == &afs_UfsCacheOps)
- lock_kernel();
-}
-
-static inline void
-afs_maybe_unlock_kernel(void) {
- if(afs_cacheType == &afs_UfsCacheOps)
- unlock_kernel();
-}
/* This function converts a positive error code from AFS into a negative
* code suitable for passing into the Linux VFS layer. It checks that the
{
struct vcache *avc = VTOAFS(FILE_INODE(fp));
struct vrequest treq;
- register struct dcache *tdc;
+ struct dcache *tdc;
int code;
int offset;
int dirpos;
cred_t *credp = crref();
struct afs_fakestat_state fakestat;
- afs_maybe_lock_kernel();
AFS_GLOCK();
AFS_STATCNT(afs_readdir);
afs_PutFakeStat(&fakestat);
out1:
AFS_GUNLOCK();
- afs_maybe_unlock_kernel();
return code;
}
/* get a validated vcache entry */
code = afs_linux_VerifyVCache(vcp, NULL);
- /* Linux's Flushpage implementation doesn't use credp, so optimise
- * our code to not need to crref() it */
- osi_FlushPages(vcp, NULL); /* ensure stale pages are gone */
+ if (code == 0) {
+ /* Linux's Flushpage implementation doesn't use credp, so optimise
+ * our code to not need to crref() it */
+ osi_FlushPages(vcp, NULL); /* ensure stale pages are gone */
+ AFS_GUNLOCK();
+ code = generic_file_mmap(fp, vmap);
+ AFS_GLOCK();
+ if (!code)
+ vcp->f.states |= CMAPPED;
+ }
AFS_GUNLOCK();
- code = generic_file_mmap(fp, vmap);
- AFS_GLOCK();
- if (!code)
- vcp->f.states |= CMAPPED;
- AFS_GUNLOCK();
return code;
}
cred_t *credp = crref();
int code;
- afs_maybe_lock_kernel();
AFS_GLOCK();
code = afs_open(&vcp, fp->f_flags, credp);
AFS_GUNLOCK();
- afs_maybe_unlock_kernel();
crfree(credp);
return afs_convert_code(code);
cred_t *credp = crref();
int code = 0;
- afs_maybe_lock_kernel();
AFS_GLOCK();
code = afs_close(vcp, fp->f_flags, credp);
ObtainWriteLock(&vcp->lock, 807);
}
ReleaseWriteLock(&vcp->lock);
AFS_GUNLOCK();
- afs_maybe_unlock_kernel();
crfree(credp);
return afs_convert_code(code);
struct inode *ip = FILE_INODE(fp);
cred_t *credp = crref();
- afs_maybe_lock_kernel();
AFS_GLOCK();
code = afs_fsync(VTOAFS(ip), credp);
AFS_GUNLOCK();
- afs_maybe_unlock_kernel();
crfree(credp);
return afs_convert_code(code);
#endif /* F_GETLK64 && F_GETLK != F_GETLK64 */
AFS_GLOCK();
- code = afs_lockctl(vcp, &flock, cmd, credp);
+ code = afs_convert_code(afs_lockctl(vcp, &flock, cmd, credp));
AFS_GUNLOCK();
if ((code == 0 || flp->fl_type == F_UNLCK) &&
flp->fl_end = flock.l_start + flock.l_len - 1;
crfree(credp);
- return afs_convert_code(code);
+ return code;
}
#ifdef STRUCT_FILE_OPERATIONS_HAS_FLOCK
#endif /* F_GETLK64 && F_GETLK != F_GETLK64 */
AFS_GLOCK();
- code = afs_lockctl(vcp, &flock, cmd, credp);
+ code = afs_convert_code(afs_lockctl(vcp, &flock, cmd, credp));
AFS_GUNLOCK();
if ((code == 0 || flp->fl_type == F_UNLCK) &&
flp->fl_pid = flock.l_pid;
crfree(credp);
- return afs_convert_code(code);
+ return code;
}
#endif
cred_t *credp;
int code;
#if defined(AFS_CACHE_BYPASS)
- int bypasscache;
+ int bypasscache = 0;
#endif
AFS_GLOCK();
if (code)
goto out;
#if defined(AFS_CACHE_BYPASS)
- /* If caching is bypassed for this file, or globally, just return 0 */
- if(cache_bypass_strategy == ALWAYS_BYPASS_CACHE)
- bypasscache = 1;
- else {
- ObtainReadLock(&vcp->lock);
- if(vcp->cachingStates & FCSBypass)
- bypasscache = 1;
- ReleaseReadLock(&vcp->lock);
- }
- if(bypasscache) {
- /* future proof: don't rely on 0 return from afs_InitReq */
- code = 0; goto out;
- }
+ /* If caching is bypassed for this file, or globally, just return 0 */
+ if (cache_bypass_strategy == ALWAYS_BYPASS_CACHE)
+ bypasscache = 1;
+ else {
+ ObtainReadLock(&vcp->lock);
+ if (vcp->cachingStates & FCSBypass)
+ bypasscache = 1;
+ ReleaseReadLock(&vcp->lock);
+ }
+ if (bypasscache) {
+ /* future proof: don't rely on 0 return from afs_InitReq */
+ code = 0;
+ goto out;
+ }
#endif
ObtainSharedLock(&vcp->lock, 535);
if (afs_shuttingdown)
return EIO;
- afs_maybe_lock_kernel();
AFS_GLOCK();
#ifdef notyet
check_bad_parent(dp); /* check and correct mvid */
AFS_GUNLOCK();
- unlock_kernel();
return 0;
}
#endif
afs_fill_inode(AFSTOV(vcp), &vattr);
AFS_GUNLOCK();
- afs_maybe_unlock_kernel();
return afs_convert_code(code);
}
int valid;
struct afs_fakestat_state fakestate;
- afs_maybe_lock_kernel();
AFS_GLOCK();
afs_InitFakeStat(&fakestate);
shrink_dcache_parent(dp);
d_drop(dp);
}
- afs_maybe_unlock_kernel();
return valid;
bad_dentry:
vattr.va_mode = mode;
vattr.va_type = mode & S_IFMT;
- afs_maybe_lock_kernel();
AFS_GLOCK();
code = afs_create(VTOAFS(dip), (char *)name, &vattr, NONEXCL, mode,
&vcp, credp);
}
AFS_GUNLOCK();
- afs_maybe_unlock_kernel();
crfree(credp);
return afs_convert_code(code);
}
struct dentry *newdp = NULL;
int code;
- afs_maybe_lock_kernel();
AFS_GLOCK();
code = afs_lookup(VTOAFS(dip), (char *)comp, &vcp, credp);
dput(alias);
} else {
iput(ip);
- afs_maybe_unlock_kernel();
crfree(credp);
return alias;
}
}
newdp = d_splice_alias(ip, dp);
- afs_maybe_unlock_kernel();
crfree(credp);
/* It's ok for the file to not be found. That's noted by the caller by
const char *name = dp->d_name.name;
struct vcache *tvc = VTOAFS(dp->d_inode);
- afs_maybe_lock_kernel();
-
if (VREFCOUNT(tvc) > 1 && tvc->opens > 0
&& !(tvc->f.states & CUnlinked)) {
d_drop(dp);
}
- afs_maybe_unlock_kernel();
crfree(credp);
return afs_convert_code(code);
}
struct vattr vattr;
const char *name = dp->d_name.name;
- afs_maybe_lock_kernel();
VATTR_NULL(&vattr);
vattr.va_mask = ATTR_MODE;
vattr.va_mode = mode;
}
AFS_GUNLOCK();
- afs_maybe_unlock_kernel();
crfree(credp);
return afs_convert_code(code);
}
struct dentry *rehash = NULL;
/* Prevent any new references during rename operation. */
- afs_maybe_lock_kernel();
if (!d_unhashed(newdp)) {
d_drop(newdp);
if (rehash)
d_rehash(rehash);
- afs_maybe_unlock_kernel();
-
crfree(credp);
return afs_convert_code(code);
}
setup_uio(auio, iovecp, (char *)address, offset, PAGE_SIZE, UIO_READ,
AFS_UIOSYS);
- afs_maybe_lock_kernel();
AFS_GLOCK();
AFS_DISCON_LOCK();
afs_Trace4(afs_iclSetp, CM_TRACE_READPAGE, ICL_TYPE_POINTER, ip,
code);
AFS_DISCON_UNLOCK();
AFS_GUNLOCK();
- afs_maybe_unlock_kernel();
if (!code) {
/* XXX valid for no-cache also? Check last bits of files... :)
* Cognate code goes in afs_NoCacheFetchProc. */
page_cache_release(pp);
iovecp[page_ix].iov_base = (void *) 0;
base_index++;
- continue;
+ ancr->length -= PAGE_SIZE;
+ continue;
}
base_index++;
if(code) {
lock_page(pp);
}
+ /* increment page refcount--our original design assumed
+ * that locking it would effectively pin it; protect
+ * ourselves from the possiblity that this assumption is
+ * is faulty, at low cost (provided we do not fail to
+ * do the corresponding decref on the other side) */
+ get_page(pp);
+
/* save the page for background map */
iovecp[page_ix].iov_base = (void*) pp;
/* and put it on the LRU cache */
if (!pagevec_add(&lrupv, pp))
- __pagevec_lru_add(&lrupv);
+ __pagevec_lru_add_file(&lrupv);
}
}
/* If there were useful pages in the page list, make sure all pages
* are in the LRU cache, then schedule the read */
if(page_count) {
- pagevec_lru_add(&lrupv);
+ if (pagevec_count(&lrupv))
+ __pagevec_lru_add_file(&lrupv);
credp = crref();
code = afs_ReadNoCache(avc, ancr, credp);
crfree(credp);
struct nocache_read_request *ancr;
int code;
+ /*
+ * Special case: if page is at or past end of file, just zero it and set
+ * it as up to date.
+ */
+ if (page_offset(pp) >= i_size_read(fp->f_mapping->host)) {
+ zero_user_segment(pp, 0, PAGE_CACHE_SIZE);
+ SetPageUptodate(pp);
+ unlock_page(pp);
+ return 0;
+ }
+
ClearPageError(pp);
/* receiver frees */
PAGE_SIZE, UIO_READ, AFS_UIOSYS);
/* save the page for background map */
- /* XXX - Shouldn't we get a reference count here? */
+ get_page(pp); /* see above */
auio->uio_iov->iov_base = (void*) pp;
/* the background thread will free this */
ancr = osi_Alloc(sizeof(struct nocache_read_request));
ancr->length = PAGE_SIZE;
credp = crref();
- afs_maybe_lock_kernel();
code = afs_ReadNoCache(VTOAFS(FILE_INODE(fp)), ancr, credp);
- afs_maybe_unlock_kernel();
crfree(credp);
return afs_convert_code(code);
buffer = kmap(pp) + offset;
base = page_offset(pp) + offset;
- afs_maybe_lock_kernel();
AFS_GLOCK();
afs_Trace4(afs_iclSetp, CM_TRACE_UPDATEPAGE, ICL_TYPE_POINTER, vcp,
ICL_TYPE_POINTER, pp, ICL_TYPE_INT32, page_count(pp),
ICL_TYPE_INT32, code);
AFS_GUNLOCK();
- afs_maybe_unlock_kernel();
kunmap(pp);
return code;
credp = crref();
code = afs_linux_page_writeback(ip, pp, offset, count, credp);
- afs_maybe_lock_kernel();
AFS_GLOCK();
ObtainWriteLock(&vcp->lock, 533);
if (code > 0)
afs_linux_complete_writeback(vcp);
ReleaseWriteLock(&vcp->lock);
AFS_GUNLOCK();
- afs_maybe_unlock_kernel();
crfree(credp);
if (code1)
code = afs_linux_page_writeback(inode, pp, 0, to, credp);
- afs_maybe_lock_kernel();
AFS_GLOCK();
ObtainWriteLock(&vcp->lock, 538);
ReleaseWriteLock(&vcp->lock);
crfree(credp);
AFS_GUNLOCK();
- afs_maybe_unlock_kernel();
done:
end_page_writeback(pp);
char *p = (char *)kmap(page);
int code;
- afs_maybe_lock_kernel();
AFS_GLOCK();
code = afs_linux_ireadlink(ip, p, PAGE_SIZE, AFS_UIOSYS);
AFS_GUNLOCK();
if (code < 0)
goto fail;
p[code] = '\0'; /* null terminate? */
- afs_maybe_unlock_kernel();
SetPageUptodate(page);
kunmap(page);
return 0;
fail:
- afs_maybe_unlock_kernel();
-
SetPageError(page);
kunmap(page);
unlock_page(page);
git://git.openafs.org / openafs.git / blobdiff