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First cut at speeding up SFTP. Generic download-management code in

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sftp.c, and psftp.c now uses that instead of going it alone. Should
in principle be easily installed in PSCP as well, but I haven't done
it yet; also it only handles downloads, not uploads, and finally it
doesn't yet properly calculate the correct number of parallel
requests to queue. Still, it's a start, and in my own tests it
seemed to perform as expected (download speed suddenly became
roughly what you'd expect from the available bandwidth, and
decreased by roughly the expected number of round-trip times).

[originally from svn r3468]
This commit is contained in:
Simon Tatham
2003-09-27 17:52:34 +00:00
parent e3018a08e8
commit bc83c59aa7
3 changed files with 290 additions and 26 deletions
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22
sftp.h
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@ -206,6 +206,12 @@ void fxp_free_names(struct fxp_names *names);
struct fxp_name *fxp_dup_name(struct fxp_name *name);
void fxp_free_name(struct fxp_name *name);
/*
* Store user data in an sftp_request structure.
*/
void *fxp_get_userdata(struct sftp_request *req);
void fxp_set_userdata(struct sftp_request *req, void *data);
/*
* These functions might well be temporary placeholders to be
* replaced with more useful similar functions later. They form the
@ -214,3 +220,19 @@ void fxp_free_name(struct fxp_name *name);
void sftp_register(struct sftp_request *req);
struct sftp_request *sftp_find_request(struct sftp_packet *pktin);
struct sftp_packet *sftp_recv(void);
/*
* A wrapper to go round fxp_read_* and fxp_write_*, which manages
* the queueing of multiple read/write requests.
*/
struct fxp_xfer;
struct fxp_xfer *xfer_download_init(struct fxp_handle *fh, uint64 offset);
int xfer_download_done(struct fxp_xfer *xfer);
void xfer_download_queue(struct fxp_xfer *xfer);
int xfer_download_gotpkt(struct fxp_xfer *xfer, struct sftp_packet *pktin);
int xfer_download_data(struct fxp_xfer *xfer, void **buf, int *len);
void xfer_set_error(struct fxp_xfer *xfer);
void xfer_cleanup(struct fxp_xfer *xfer);