289b04677a
This obviates the need for several file system implementations to remember the device on which they are mounted. Change-Id: Ida8325cf4bcf072e61761cfee34e3f7ed2d750b9
98 lines
2.1 KiB
C
98 lines
2.1 KiB
C
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#include "fsdriver.h"
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/* Library-local variables. */
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dev_t fsdriver_device;
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ino_t fsdriver_root;
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int fsdriver_mounted = FALSE;
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static int fsdriver_running;
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/*
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* Process an incoming VFS request, and send a reply. If the message is not
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* a file system request from VFS, pass it on to the generic message handler.
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* Multithreaded file systems should indicate that the reply is to be sent to
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* VFS asynchronously.
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*/
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void
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fsdriver_process(const struct fsdriver * __restrict fdp,
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const message * __restrict m_ptr, int ipc_status, int asyn_reply)
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{
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message m_out;
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unsigned int call_nr;
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int r, transid;
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/* Is this a file system request at all? */
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if (is_ipc_notify(ipc_status) || m_ptr->m_source != VFS_PROC_NR) {
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if (fdp->fdr_other != NULL)
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fdp->fdr_other(m_ptr, ipc_status);
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return; /* do not send a reply */
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}
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/* Call the appropriate function. */
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transid = TRNS_GET_ID(m_ptr->m_type);
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call_nr = TRNS_DEL_ID(m_ptr->m_type);
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memset(&m_out, 0, sizeof(m_out));
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if (fsdriver_mounted || call_nr == REQ_READSUPER) {
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call_nr -= FS_BASE; /* unsigned; wrapping is intended */
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if (call_nr < NREQS && fsdriver_callvec[call_nr] != NULL)
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r = (fsdriver_callvec[call_nr])(fdp, m_ptr, &m_out);
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else
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r = ENOSYS;
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} else
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r = EINVAL;
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/* Send a reply. */
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m_out.m_type = TRNS_ADD_ID(r, transid);
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if (asyn_reply)
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r = asynsend(m_ptr->m_source, &m_out);
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else
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r = ipc_send(m_ptr->m_source, &m_out);
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if (r != OK)
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printf("fsdriver: sending reply failed (%d)\n", r);
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if (fdp->fdr_postcall != NULL)
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fdp->fdr_postcall();
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}
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/*
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* Terminate the file server as soon as the file system has been unmounted.
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*/
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void
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fsdriver_terminate(void)
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{
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fsdriver_running = FALSE;
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sef_cancel();
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}
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/*
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* Main program of any file server task.
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*/
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void
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fsdriver_task(struct fsdriver * fdp)
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{
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message mess;
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int r, ipc_status;
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fsdriver_running = TRUE;
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while (fsdriver_running || fsdriver_mounted) {
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if ((r = sef_receive_status(ANY, &mess, &ipc_status)) != OK) {
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if (r == EINTR)
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continue; /* sef_cancel() was called */
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panic("fsdriver: sef_receive_status failed: %d", r);
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}
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fsdriver_process(fdp, &mess, ipc_status, FALSE /*asyn_reply*/);
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}
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}
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