int diskManager_readContents(u32int inodeNumber, char* contents, u32int length, u32int offset) {
iNodeDisk inode;
_getiNode(inodeNumber, &inode);
if (inode.data.magic != MAGIC_NUMBER) {
log(L_ERROR, "Trying to read a corrupted page at [%d, %d]", inode.data.nextSector, inode.data.nextOffset);
errno = E_CORRUPTED_FILE;
return -1;
}
// log(L_TRACE, "READING %d bytes from inode %d with %d bytes / %d", length, inodeNumber, inode.data.totalLength, inode.data.usedBytes);
return _readBlock(&inode.data, contents, length, offset);
}
int iFuseBufferedFsReadBlock(iFuseFd_t *iFuseFd, char *buf, unsigned int blockID) {
int status = 0;
assert(iFuseFd != NULL);
assert(buf != NULL);
iFuseRodsClientLog(LOG_DEBUG, "iFuseBufferedFsReadBlock: %s, blockID: %u", iFuseFd->iRodsPath, blockID);
status = _readBlock(iFuseFd, buf, blockID);
if(status < 0) {
iFuseRodsClientLogError(LOG_ERROR, status, "iFuseBufferedFsReadBlock: _readBlock of %s error, status = %d",
iFuseFd->iRodsPath, status);
return status;
}
return status;
}
/*
* Read buffer cache data
*/
int iFuseBufferedFsRead(iFuseFd_t *iFuseFd, char *buf, off_t off, size_t size) {
int status = 0;
size_t readSize = 0;
size_t remain = 0;
off_t curOffset = 0;
char *blockBuffer = (char*)calloc(1, IFUSE_BUFFER_CACHE_BLOCK_SIZE);
if(blockBuffer == NULL) {
return SYS_MALLOC_ERR;
}
assert(iFuseFd != NULL);
assert(buf != NULL);
iFuseRodsClientLog(LOG_DEBUG, "iFuseBufferedFsRead: %s, offset: %lld, size: %lld", iFuseFd->iRodsPath, (long long)off, (long long)size);
// read in block level
remain = size;
curOffset = off;
while(remain > 0) {
off_t inBlockOffset = getInBlockOffset(curOffset);
size_t inBlockAvail = IFUSE_BUFFER_CACHE_BLOCK_SIZE - inBlockOffset;
size_t curSize = inBlockAvail > remain ? remain : inBlockAvail;
size_t blockSize = 0;
status = _readBlock(iFuseFd, blockBuffer, getBlockID(curOffset));
if(status < 0) {
iFuseRodsClientLogError(LOG_ERROR, status, "iFuseBufferedFsRead: _readBlock of %s error, status = %d",
iFuseFd->iRodsPath, status);
return status;
} else if(status == 0) {
// eof
break;
}
blockSize = (size_t)status;
iFuseRodsClientLog(LOG_DEBUG, "iFuseBufferedFsRead: _readBlock of %s, offset: %lld, in-block offset: %lld, curSize: %lld, size: %lld", iFuseFd->iRodsPath, (long long)curOffset, (long long)inBlockOffset, (long long)curSize, (long long)blockSize);
if(inBlockOffset + curSize > blockSize) {
curSize = blockSize - inBlockOffset;
}
if (curSize == 0) {
// eof
break;
}
iFuseRodsClientLog(LOG_DEBUG, "iFuseBufferedFsRead: block read of %s - offset %lld, size %lld", iFuseFd->iRodsPath, (long long)curOffset, (long long)curSize);
// copy
memcpy(buf + readSize, blockBuffer + inBlockOffset, curSize);
readSize += curSize;
remain -= curSize;
curOffset += curSize;
if(blockSize < IFUSE_BUFFER_CACHE_BLOCK_SIZE) {
// eof
break;
}
}
free(blockBuffer);
return readSize;
}
