static int
afs_DisconCreateSymlink(struct vcache *avc, char *aname,
struct vrequest *areq) {
struct dcache *tdc;
struct osi_file *tfile;
afs_size_t offset, len;
tdc = afs_GetDCache(avc, 0, areq, &offset, &len, 0);
if (!tdc) {
/* printf("afs_DisconCreateSymlink: can't get new dcache for symlink.\n"); */
return ENETDOWN;
}
len = strlen(aname);
avc->f.m.Length = len;
ObtainWriteLock(&tdc->lock, 720);
afs_AdjustSize(tdc, len);
tdc->validPos = len;
tfile = afs_CFileOpen(&tdc->f.inode);
afs_CFileWrite(tfile, 0, aname, len);
afs_CFileClose(tfile);
ReleaseWriteLock(&tdc->lock);
return 0;
}
int
DNew(struct dcache *adc, int page, struct DirBuffer *entry)
{
/* Same as read, only do *not* even try to read the page, since it
* probably doesn't exist. */
struct buffer *tb;
AFS_STATCNT(DNew);
ObtainWriteLock(&afs_bufferLock, 264);
if ((tb = afs_newslot(adc, page, NULL)) == 0) {
ReleaseWriteLock(&afs_bufferLock);
return EIO;
}
/* extend the chunk, if needed */
/* Do it now, not in DFlush or afs_newslot when the data is written out,
* since now our caller has adc->lock writelocked, and we can't acquire
* that lock (or even map from a fid to a dcache) in afs_newslot or
* DFlush due to lock hierarchy issues */
if ((page + 1) * AFS_BUFFER_PAGESIZE > adc->f.chunkBytes) {
afs_AdjustSize(adc, (page + 1) * AFS_BUFFER_PAGESIZE);
osi_Assert(afs_WriteDCache(adc, 1) == 0);
}
ObtainWriteLock(&tb->lock, 265);
tb->lockers++;
ReleaseWriteLock(&afs_bufferLock);
ReleaseWriteLock(&tb->lock);
entry->buffer = tb;
entry->data = tb->data;
return 0;
}
/*!
*
* Extend a cache file
*
* \param avc pointer to vcache to extend data for
* \param alen Length to extend file to
* \param areq
*
* \note avc must be write locked. May release and reobtain avc and GLOCK
*/
int
afs_ExtendSegments(struct vcache *avc, afs_size_t alen, struct vrequest *areq)
{
afs_size_t offset, toAdd;
struct osi_file *tfile;
afs_int32 code = 0;
struct dcache *tdc;
void *zeros;
zeros = afs_osi_Alloc(AFS_PAGESIZE);
if (zeros == NULL)
return ENOMEM;
memset(zeros, 0, AFS_PAGESIZE);
while (avc->f.m.Length < alen) {
tdc = afs_ObtainDCacheForWriting(avc, avc->f.m.Length, alen - avc->f.m.Length, areq, 0);
if (!tdc) {
code = EIO;
break;
}
toAdd = alen - avc->f.m.Length;
offset = avc->f.m.Length - AFS_CHUNKTOBASE(tdc->f.chunk);
if (offset + toAdd > AFS_CHUNKTOSIZE(tdc->f.chunk)) {
toAdd = AFS_CHUNKTOSIZE(tdc->f.chunk) - offset;
}
tfile = afs_CFileOpen(&tdc->f.inode);
while(tdc->validPos < avc->f.m.Length + toAdd) {
afs_size_t towrite;
towrite = (avc->f.m.Length + toAdd) - tdc->validPos;
if (towrite > AFS_PAGESIZE) towrite = AFS_PAGESIZE;
code = afs_CFileWrite(tfile,
tdc->validPos - AFS_CHUNKTOBASE(tdc->f.chunk),
zeros, towrite);
tdc->validPos += towrite;
}
afs_CFileClose(tfile);
afs_AdjustSize(tdc, offset + toAdd );
avc->f.m.Length += toAdd;
ReleaseWriteLock(&tdc->lock);
afs_PutDCache(tdc);
}
afs_osi_Free(zeros, AFS_PAGESIZE);
return code;
}
/*
* afs_TruncateAllSegments
*
* Description:
* Truncate a cache file.
*
* Parameters:
* avc : Ptr to vcache entry to truncate.
* alen : Number of bytes to make the file.
* areq : Ptr to request structure.
*
* Environment:
* Called with avc write-locked; in VFS40 systems, pvnLock is also
* held.
*/
int
afs_TruncateAllSegments(struct vcache *avc, afs_size_t alen,
struct vrequest *areq, afs_ucred_t *acred)
{
struct dcache *tdc;
afs_int32 code;
afs_int32 index;
afs_size_t newSize;
int dcCount, dcPos;
struct dcache **tdcArray = NULL;
AFS_STATCNT(afs_TruncateAllSegments);
avc->f.m.Date = osi_Time();
afs_Trace3(afs_iclSetp, CM_TRACE_TRUNCALL, ICL_TYPE_POINTER, avc,
ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->f.m.Length),
ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(alen));
if (alen >= avc->f.m.Length) {
/*
* Special speedup since Sun's vm extends the file this way;
* we've never written to the file thus we can just set the new
* length and avoid the needless calls below.
* Also used for ftruncate calls which can extend the file.
* To completely minimize the possible extra StoreMini RPC, we really
* should keep the ExtendedPos as well and clear this flag if we
* truncate below that value before we store the file back.
*/
avc->f.states |= CExtendedFile;
avc->f.m.Length = alen;
return 0;
}
#if (defined(AFS_SUN5_ENV))
/* Zero unused portion of last page */
osi_VM_PreTruncate(avc, alen, acred);
#endif
#if (defined(AFS_SUN5_ENV))
ObtainWriteLock(&avc->vlock, 546);
avc->activeV++; /* Block new getpages */
ReleaseWriteLock(&avc->vlock);
#endif
ReleaseWriteLock(&avc->lock);
AFS_GUNLOCK();
/* Flush pages beyond end-of-file. */
osi_VM_Truncate(avc, alen, acred);
AFS_GLOCK();
ObtainWriteLock(&avc->lock, 79);
avc->f.m.Length = alen;
if (alen < avc->f.truncPos)
avc->f.truncPos = alen;
code = DVHash(&avc->f.fid);
/* block out others from screwing with this table */
ObtainWriteLock(&afs_xdcache, 287);
dcCount = 0;
for (index = afs_dvhashTbl[code]; index != NULLIDX;) {
if (afs_indexUnique[index] == avc->f.fid.Fid.Unique) {
tdc = afs_GetValidDSlot(index);
if (!tdc) {
ReleaseWriteLock(&afs_xdcache);
code = EIO;
goto done;
}
ReleaseReadLock(&tdc->tlock);
if (!FidCmp(&tdc->f.fid, &avc->f.fid))
dcCount++;
afs_PutDCache(tdc);
}
index = afs_dvnextTbl[index];
}
/* Now allocate space where we can save those dcache entries, and
* do a second pass over them.. Since we're holding xdcache, it
* shouldn't be changing.
*/
tdcArray = osi_Alloc(dcCount * sizeof(struct dcache *));
dcPos = 0;
for (index = afs_dvhashTbl[code]; index != NULLIDX; index = afs_dvnextTbl[index]) {
if (afs_indexUnique[index] == avc->f.fid.Fid.Unique) {
tdc = afs_GetValidDSlot(index);
if (!tdc) {
/* make sure we put back all of the tdcArray members before
* bailing out */
/* remember, the last valid tdc is at dcPos-1, so start at
* dcPos-1, not at dcPos itself. */
for (dcPos = dcPos - 1; dcPos >= 0; dcPos--) {
tdc = tdcArray[dcPos];
afs_PutDCache(tdc);
}
code = EIO;
goto done;
}
ReleaseReadLock(&tdc->tlock);
if (!FidCmp(&tdc->f.fid, &avc->f.fid)) {
/* same file, and modified, we'll store it back */
if (dcPos < dcCount) {
tdcArray[dcPos++] = tdc;
} else {
afs_PutDCache(tdc);
}
} else {
afs_PutDCache(tdc);
}
}
}
ReleaseWriteLock(&afs_xdcache);
/* Now we loop over the array of dcache entries and truncate them */
for (index = 0; index < dcPos; index++) {
struct osi_file *tfile;
tdc = tdcArray[index];
newSize = alen - AFS_CHUNKTOBASE(tdc->f.chunk);
if (newSize < 0)
newSize = 0;
ObtainSharedLock(&tdc->lock, 672);
if (newSize < tdc->f.chunkBytes && newSize < MAX_AFS_UINT32) {
UpgradeSToWLock(&tdc->lock, 673);
tdc->f.states |= DWriting;
tfile = afs_CFileOpen(&tdc->f.inode);
afs_CFileTruncate(tfile, (afs_int32)newSize);
afs_CFileClose(tfile);
afs_AdjustSize(tdc, (afs_int32)newSize);
if (alen < tdc->validPos) {
if (alen < AFS_CHUNKTOBASE(tdc->f.chunk))
tdc->validPos = 0;
else
tdc->validPos = alen;
}
ConvertWToSLock(&tdc->lock);
}
ReleaseSharedLock(&tdc->lock);
afs_PutDCache(tdc);
}
code = 0;
done:
if (tdcArray) {
osi_Free(tdcArray, dcCount * sizeof(struct dcache *));
}
#if (defined(AFS_SUN5_ENV))
ObtainWriteLock(&avc->vlock, 547);
if (--avc->activeV == 0 && (avc->vstates & VRevokeWait)) {
avc->vstates &= ~VRevokeWait;
afs_osi_Wakeup((char *)&avc->vstates);
}
ReleaseWriteLock(&avc->vlock);
#endif
return code;
}
