[kio] [Bug 291835] KIO very slow when copying from network through smb
oliver at openbrackets.net
oliver at openbrackets.net
Fri Dec 23 18:33:46 GMT 2016
https://bugs.kde.org/show_bug.cgi?id=291835
--- Comment #45 from oliver at openbrackets.net <oliver at openbrackets.net> ---
I think we can safely assume that the SMB protocol is not just "a socket".
Obviously no-one wants to re-implement an SMB protocol client, that would be a
huge task.
So it's really a question of whether libsmbclient (or similar lib) can support
"just being fed data from an FD". From all I have seen, that is not the case.
libsmbclient expects discrete calls to smbc_read|write:
/**@ingroup file
* Read from a file using an opened file handle.
*
* @param fd Open file handle from smbc_open() or smbc_creat()
*
* @param buf Pointer to buffer to receive read data
*
* @param bufsize Size of buf in bytes
*
* @return Number of bytes read;
* 0 upon EOF;
* < 0 on error, with errno set:
* - EISDIR fd refers to a directory
* - EBADF fd is not a valid file descriptor or
* is not open for reading.
* - EINVAL fd is attached to an object which is
* unsuitable for reading, or no buffer passed or
* smbc_init not called.
*
* @see smbc_open(), smbc_write()
*
*/
ssize_t smbc_read(int fd, void *buf, size_t bufsize);
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