642 lines
14 KiB
C
642 lines
14 KiB
C
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/* libbdev - block device interfacing library, by D.C. van Moolenbroek */
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#include <minix/drivers.h>
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#include <minix/bdev.h>
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#include <minix/ioctl.h>
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#include <assert.h>
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#include "const.h"
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#include "type.h"
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#include "proto.h"
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void bdev_driver(dev_t dev, char *label)
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{
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/* Associate a driver with the given (major) device, using its endpoint.
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* File system usage note: typically called from mount and newdriver.
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*/
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static int first = TRUE;
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if (first) {
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/* Initialize the driver endpoint array. */
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bdev_driver_init();
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first = FALSE;
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}
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bdev_update(dev, label);
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}
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static int bdev_retry(int *driver_tries, int *transfer_tries, int *result)
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{
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/* Return TRUE iff the call result implies that we should retry the operation.
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*/
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switch (*result) {
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case ERESTART:
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/* We get this error internally if the driver has restarted and the
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* current operation may now go through. Check the retry count for
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* driver restarts first, as we don't want to keep trying forever.
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*/
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if (++*driver_tries < DRIVER_TRIES)
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return TRUE;
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*result = EDEADSRCDST;
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break;
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case EIO:
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/* The 'transfer_tries' pointer is non-NULL if this was a transfer
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* request. If we get back an I/O failure, keep retrying the request
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* until we hit the transfer retry limit.
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*/
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if (transfer_tries != NULL && ++*transfer_tries < TRANSFER_TRIES)
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return TRUE;
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break;
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}
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return FALSE;
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}
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static int bdev_opcl(int req, dev_t dev, int access)
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{
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/* Open or close the given minor device.
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*/
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message m;
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int r, driver_tries = 0;
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do {
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memset(&m, 0, sizeof(m));
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m.m_type = req;
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m.m_lbdev_lblockdriver_msg.minor = minor(dev);
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m.m_lbdev_lblockdriver_msg.access = access;
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r = bdev_sendrec(dev, &m);
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} while (bdev_retry(&driver_tries, NULL, &r));
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return r;
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}
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int bdev_open(dev_t dev, int access)
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{
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/* Open the given minor device.
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* File system usage note: typically called from mount, after bdev_driver.
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*/
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int r;
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r = bdev_opcl(BDEV_OPEN, dev, access);
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if (r == OK)
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bdev_minor_add(dev, access);
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return r;
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}
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int bdev_close(dev_t dev)
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{
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/* Close the given minor device.
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* File system usage note: typically called from unmount.
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*/
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int r;
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bdev_flush_asyn(dev);
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r = bdev_opcl(BDEV_CLOSE, dev, 0);
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if (r == OK)
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bdev_minor_del(dev);
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return r;
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}
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static int bdev_rdwt_setup(int req, dev_t dev, u64_t pos, char *buf,
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size_t count, int flags, message *m)
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{
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/* Set up a single-buffer read/write request.
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*/
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endpoint_t endpt;
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cp_grant_id_t grant;
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int access;
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assert((ssize_t) count >= 0);
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if ((endpt = bdev_driver_get(dev)) == NONE)
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return EDEADSRCDST;
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access = (req == BDEV_READ) ? CPF_WRITE : CPF_READ;
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grant = cpf_grant_direct(endpt, (vir_bytes) buf, count, access);
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if (!GRANT_VALID(grant)) {
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printf("bdev: unable to allocate grant!\n");
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return EINVAL;
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}
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memset(m, 0, sizeof(*m));
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m->m_type = req;
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m->m_lbdev_lblockdriver_msg.minor = minor(dev);
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m->m_lbdev_lblockdriver_msg.pos = pos;
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m->m_lbdev_lblockdriver_msg.count = count;
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m->m_lbdev_lblockdriver_msg.grant = grant;
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m->m_lbdev_lblockdriver_msg.flags = flags;
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return OK;
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}
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static void bdev_rdwt_cleanup(const message *m)
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{
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/* Clean up a single-buffer read/write request.
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*/
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cpf_revoke(m->m_lbdev_lblockdriver_msg.grant);
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}
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static ssize_t bdev_rdwt(int req, dev_t dev, u64_t pos, char *buf,
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size_t count, int flags)
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{
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/* Perform a synchronous read or write call using a single buffer.
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*/
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message m;
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int r, driver_tries = 0, transfer_tries = 0;
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do {
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if ((r = bdev_rdwt_setup(req, dev, pos, buf, count, flags, &m)) != OK)
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break;
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r = bdev_sendrec(dev, &m);
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bdev_rdwt_cleanup(&m);
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} while (bdev_retry(&driver_tries, &transfer_tries, &r));
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return r;
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}
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static int bdev_vrdwt_setup(int req, dev_t dev, u64_t pos, iovec_t *vec,
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int count, int flags, message *m, iovec_s_t *gvec)
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{
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/* Set up a vectored read/write request.
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*/
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ssize_t size;
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endpoint_t endpt;
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cp_grant_id_t grant;
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int i, access;
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assert(count <= NR_IOREQS);
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if ((endpt = bdev_driver_get(dev)) == NONE)
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return EDEADSRCDST;
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access = (req == BDEV_GATHER) ? CPF_WRITE : CPF_READ;
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size = 0;
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for (i = 0; i < count; i++) {
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grant = cpf_grant_direct(endpt, vec[i].iov_addr, vec[i].iov_size,
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access);
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if (!GRANT_VALID(grant)) {
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printf("bdev: unable to allocate grant!\n");
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for (i--; i >= 0; i--)
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cpf_revoke(gvec[i].iov_grant);
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return EINVAL;
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}
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gvec[i].iov_grant = grant;
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gvec[i].iov_size = vec[i].iov_size;
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assert(vec[i].iov_size > 0);
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assert((ssize_t) (size + vec[i].iov_size) > size);
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size += vec[i].iov_size;
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}
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grant = cpf_grant_direct(endpt, (vir_bytes) gvec, sizeof(gvec[0]) * count,
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CPF_READ);
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if (!GRANT_VALID(grant)) {
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printf("bdev: unable to allocate grant!\n");
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for (i = count - 1; i >= 0; i--)
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cpf_revoke(gvec[i].iov_grant);
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return EINVAL;
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}
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memset(m, 0, sizeof(*m));
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m->m_type = req;
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m->m_lbdev_lblockdriver_msg.minor = minor(dev);
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m->m_lbdev_lblockdriver_msg.pos = pos;
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m->m_lbdev_lblockdriver_msg.count = count;
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m->m_lbdev_lblockdriver_msg.grant = grant;
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m->m_lbdev_lblockdriver_msg.flags = flags;
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return OK;
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}
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static void bdev_vrdwt_cleanup(const message *m, iovec_s_t *gvec)
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{
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/* Clean up a vectored read/write request.
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*/
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cp_grant_id_t grant;
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int i;
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grant = m->m_lbdev_lblockdriver_msg.grant;
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cpf_revoke(grant);
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for (i = m->m_lbdev_lblockdriver_msg.count - 1; i >= 0; i--)
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cpf_revoke(gvec[i].iov_grant);
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}
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static ssize_t bdev_vrdwt(int req, dev_t dev, u64_t pos, iovec_t *vec,
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int count, int flags)
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{
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/* Perform a synchronous read or write call using a vector of buffers.
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*/
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iovec_s_t gvec[NR_IOREQS];
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message m;
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int r, driver_tries = 0, transfer_tries = 0;
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do {
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if ((r = bdev_vrdwt_setup(req, dev, pos, vec, count, flags, &m,
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gvec)) != OK)
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break;
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r = bdev_sendrec(dev, &m);
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bdev_vrdwt_cleanup(&m, gvec);
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} while (bdev_retry(&driver_tries, &transfer_tries, &r));
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return r;
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}
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ssize_t bdev_read(dev_t dev, u64_t pos, char *buf, size_t count, int flags)
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{
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/* Perform a synchronous read call into a single buffer.
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*/
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return bdev_rdwt(BDEV_READ, dev, pos, buf, count, flags);
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}
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ssize_t bdev_write(dev_t dev, u64_t pos, char *buf, size_t count, int flags)
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{
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/* Perform a synchronous write call from a single buffer.
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*/
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return bdev_rdwt(BDEV_WRITE, dev, pos, buf, count, flags);
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}
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ssize_t bdev_gather(dev_t dev, u64_t pos, iovec_t *vec, int count, int flags)
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{
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/* Perform a synchronous read call into a vector of buffers.
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*/
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return bdev_vrdwt(BDEV_GATHER, dev, pos, vec, count, flags);
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}
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ssize_t bdev_scatter(dev_t dev, u64_t pos, iovec_t *vec, int count, int flags)
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{
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/* Perform a synchronous write call from a vector of buffers.
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*/
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return bdev_vrdwt(BDEV_SCATTER, dev, pos, vec, count, flags);
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}
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static int bdev_ioctl_setup(dev_t dev, int request, void *buf,
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endpoint_t user_endpt, message *m)
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{
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/* Set up an I/O control request.
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*/
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endpoint_t endpt;
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size_t size;
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cp_grant_id_t grant;
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int access;
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if ((endpt = bdev_driver_get(dev)) == NONE)
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return EDEADSRCDST;
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if (_MINIX_IOCTL_BIG(request))
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size = _MINIX_IOCTL_SIZE_BIG(request);
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else
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size = _MINIX_IOCTL_SIZE(request);
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access = 0;
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if (_MINIX_IOCTL_IOR(request)) access |= CPF_WRITE;
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if (_MINIX_IOCTL_IOW(request)) access |= CPF_READ;
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/* The size may be 0, in which case 'buf' need not be a valid pointer. */
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grant = cpf_grant_direct(endpt, (vir_bytes) buf, size, access);
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if (!GRANT_VALID(grant)) {
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printf("bdev: unable to allocate grant!\n");
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return EINVAL;
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}
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memset(m, 0, sizeof(*m));
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m->m_type = BDEV_IOCTL;
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m->m_lbdev_lblockdriver_msg.minor = minor(dev);
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m->m_lbdev_lblockdriver_msg.request = request;
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m->m_lbdev_lblockdriver_msg.grant = grant;
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m->m_lbdev_lblockdriver_msg.user = user_endpt;
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return OK;
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}
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static void bdev_ioctl_cleanup(const message *m)
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{
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/* Clean up an I/O control request.
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*/
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cpf_revoke(m->m_lbdev_lblockdriver_msg.grant);
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}
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int bdev_ioctl(dev_t dev, int request, void *buf, endpoint_t user_endpt)
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{
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/* Perform a synchronous I/O control request.
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*/
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message m;
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int r, driver_tries = 0;
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do {
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if ((r = bdev_ioctl_setup(dev, request, buf, user_endpt, &m)) != OK)
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break;
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r = bdev_sendrec(dev, &m);
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bdev_ioctl_cleanup(&m);
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} while (bdev_retry(&driver_tries, NULL, &r));
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return r;
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}
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void bdev_flush_asyn(dev_t dev)
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{
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/* Flush all ongoing asynchronous requests to the given minor device. This
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* involves blocking until all I/O for it has completed.
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* File system usage note: typically called from flush.
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*/
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bdev_call_t *call;
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while ((call = bdev_call_find(dev)) != NULL)
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(void) bdev_wait_asyn(call->id);
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}
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static bdev_id_t bdev_rdwt_asyn(int req, dev_t dev, u64_t pos, char *buf,
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size_t count, int flags, bdev_callback_t callback, bdev_param_t param)
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{
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/* Perform an asynchronous read or write call using a single buffer.
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*/
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bdev_call_t *call;
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int r;
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if ((call = bdev_call_alloc(1)) == NULL)
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return ENOMEM;
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if ((r = bdev_rdwt_setup(req, dev, pos, buf, count, flags, &call->msg)) !=
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OK) {
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bdev_call_free(call);
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return r;
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}
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if ((r = bdev_senda(dev, &call->msg, call->id)) != OK) {
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bdev_rdwt_cleanup(&call->msg);
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bdev_call_free(call);
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return r;
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}
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call->dev = dev;
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call->callback = callback;
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call->param = param;
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call->driver_tries = 0;
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call->transfer_tries = 0;
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call->vec[0].iov_addr = (vir_bytes) buf;
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call->vec[0].iov_size = count;
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return call->id;
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}
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static bdev_id_t bdev_vrdwt_asyn(int req, dev_t dev, u64_t pos, iovec_t *vec,
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int count, int flags, bdev_callback_t callback, bdev_param_t param)
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{
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/* Perform an asynchronous read or write call using a vector of buffers.
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*/
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bdev_call_t *call;
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int r;
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if ((call = bdev_call_alloc(count)) == NULL)
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return ENOMEM;
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if ((r = bdev_vrdwt_setup(req, dev, pos, vec, count, flags, &call->msg,
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call->gvec)) != OK) {
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bdev_call_free(call);
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return r;
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}
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if ((r = bdev_senda(dev, &call->msg, call->id)) != OK) {
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bdev_vrdwt_cleanup(&call->msg, call->gvec);
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bdev_call_free(call);
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return r;
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}
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call->dev = dev;
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call->callback = callback;
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||
|
call->param = param;
|
||
|
call->driver_tries = 0;
|
||
|
call->transfer_tries = 0;
|
||
|
memcpy(call->vec, vec, sizeof(vec[0]) * count);
|
||
|
|
||
|
return call->id;
|
||
|
}
|
||
|
|
||
|
bdev_id_t bdev_read_asyn(dev_t dev, u64_t pos, char *buf, size_t count,
|
||
|
int flags, bdev_callback_t callback, bdev_param_t param)
|
||
|
{
|
||
|
/* Perform an asynchronous read call into a single buffer.
|
||
|
*/
|
||
|
|
||
|
return bdev_rdwt_asyn(BDEV_READ, dev, pos, buf, count, flags, callback,
|
||
|
param);
|
||
|
}
|
||
|
|
||
|
bdev_id_t bdev_write_asyn(dev_t dev, u64_t pos, char *buf, size_t count,
|
||
|
int flags, bdev_callback_t callback, bdev_param_t param)
|
||
|
{
|
||
|
/* Perform an asynchronous write call from a single buffer.
|
||
|
*/
|
||
|
|
||
|
return bdev_rdwt_asyn(BDEV_WRITE, dev, pos, buf, count, flags, callback,
|
||
|
param);
|
||
|
}
|
||
|
|
||
|
bdev_id_t bdev_gather_asyn(dev_t dev, u64_t pos, iovec_t *vec, int count,
|
||
|
int flags, bdev_callback_t callback, bdev_param_t param)
|
||
|
{
|
||
|
/* Perform an asynchronous read call into a vector of buffers.
|
||
|
*/
|
||
|
|
||
|
return bdev_vrdwt_asyn(BDEV_GATHER, dev, pos, vec, count, flags, callback,
|
||
|
param);
|
||
|
}
|
||
|
|
||
|
bdev_id_t bdev_scatter_asyn(dev_t dev, u64_t pos, iovec_t *vec, int count,
|
||
|
int flags, bdev_callback_t callback, bdev_param_t param)
|
||
|
{
|
||
|
/* Perform an asynchronous write call into a vector of buffers.
|
||
|
*/
|
||
|
|
||
|
return bdev_vrdwt_asyn(BDEV_SCATTER, dev, pos, vec, count, flags, callback,
|
||
|
param);
|
||
|
}
|
||
|
|
||
|
bdev_id_t bdev_ioctl_asyn(dev_t dev, int request, void *buf,
|
||
|
endpoint_t user_endpt, bdev_callback_t callback, bdev_param_t param)
|
||
|
{
|
||
|
/* Perform an asynchronous I/O control request.
|
||
|
*/
|
||
|
bdev_call_t *call;
|
||
|
int r;
|
||
|
|
||
|
if ((call = bdev_call_alloc(1)) == NULL)
|
||
|
return ENOMEM;
|
||
|
|
||
|
if ((r = bdev_ioctl_setup(dev, request, buf, user_endpt,
|
||
|
&call->msg)) != OK) {
|
||
|
bdev_call_free(call);
|
||
|
|
||
|
return r;
|
||
|
}
|
||
|
|
||
|
if ((r = bdev_senda(dev, &call->msg, call->id)) != OK) {
|
||
|
bdev_ioctl_cleanup(&call->msg);
|
||
|
|
||
|
bdev_call_free(call);
|
||
|
|
||
|
return r;
|
||
|
}
|
||
|
|
||
|
call->dev = dev;
|
||
|
call->callback = callback;
|
||
|
call->param = param;
|
||
|
call->driver_tries = 0;
|
||
|
call->vec[0].iov_addr = (vir_bytes) buf;
|
||
|
|
||
|
return call->id;
|
||
|
}
|
||
|
|
||
|
void bdev_callback_asyn(bdev_call_t *call, int result)
|
||
|
{
|
||
|
/* Perform the callback for an asynchronous request, with the given result.
|
||
|
* Clean up the call structure afterwards.
|
||
|
*/
|
||
|
|
||
|
/* If this was a transfer request and the result is EIO, we may want to retry
|
||
|
* the request first.
|
||
|
*/
|
||
|
switch (call->msg.m_type) {
|
||
|
case BDEV_READ:
|
||
|
case BDEV_WRITE:
|
||
|
case BDEV_GATHER:
|
||
|
case BDEV_SCATTER:
|
||
|
if (result == EIO && ++call->transfer_tries < TRANSFER_TRIES) {
|
||
|
result = bdev_senda(call->dev, &call->msg, call->id);
|
||
|
|
||
|
if (result == OK)
|
||
|
return;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* Clean up. */
|
||
|
switch (call->msg.m_type) {
|
||
|
case BDEV_READ:
|
||
|
case BDEV_WRITE:
|
||
|
bdev_rdwt_cleanup(&call->msg);
|
||
|
|
||
|
break;
|
||
|
|
||
|
case BDEV_GATHER:
|
||
|
case BDEV_SCATTER:
|
||
|
bdev_vrdwt_cleanup(&call->msg, call->gvec);
|
||
|
|
||
|
break;
|
||
|
|
||
|
case BDEV_IOCTL:
|
||
|
bdev_ioctl_cleanup(&call->msg);
|
||
|
|
||
|
break;
|
||
|
|
||
|
default:
|
||
|
assert(0);
|
||
|
}
|
||
|
|
||
|
/* Call the callback function. */
|
||
|
/* FIXME: we assume all reasonable ssize_t values can be stored in an int. */
|
||
|
call->callback(call->dev, call->id, call->param, result);
|
||
|
|
||
|
/* Free up the call structure. */
|
||
|
bdev_call_free(call);
|
||
|
}
|
||
|
|
||
|
int bdev_restart_asyn(bdev_call_t *call)
|
||
|
{
|
||
|
/* The driver for the given call has restarted, and may now have a new
|
||
|
* endpoint. Recreate and resend the request for the given call.
|
||
|
*/
|
||
|
int type, r = OK;
|
||
|
|
||
|
/* Update and check the retry limit for driver restarts first. */
|
||
|
if (++call->driver_tries >= DRIVER_TRIES)
|
||
|
return EDEADSRCDST;
|
||
|
|
||
|
/* Recreate all grants for the new endpoint. */
|
||
|
type = call->msg.m_type;
|
||
|
|
||
|
switch (type) {
|
||
|
case BDEV_READ:
|
||
|
case BDEV_WRITE:
|
||
|
bdev_rdwt_cleanup(&call->msg);
|
||
|
|
||
|
r = bdev_rdwt_setup(type, call->dev,
|
||
|
call->msg.m_lbdev_lblockdriver_msg.pos,
|
||
|
(char *) call->vec[0].iov_addr, call->msg.m_lbdev_lblockdriver_msg.count,
|
||
|
call->msg.m_lbdev_lblockdriver_msg.flags, &call->msg);
|
||
|
|
||
|
break;
|
||
|
|
||
|
case BDEV_GATHER:
|
||
|
case BDEV_SCATTER:
|
||
|
bdev_vrdwt_cleanup(&call->msg, call->gvec);
|
||
|
|
||
|
r = bdev_vrdwt_setup(type, call->dev,
|
||
|
call->msg.m_lbdev_lblockdriver_msg.pos,
|
||
|
call->vec, call->msg.m_lbdev_lblockdriver_msg.count, call->msg.m_lbdev_lblockdriver_msg.flags,
|
||
|
&call->msg, call->gvec);
|
||
|
|
||
|
break;
|
||
|
|
||
|
case BDEV_IOCTL:
|
||
|
bdev_ioctl_cleanup(&call->msg);
|
||
|
|
||
|
r = bdev_ioctl_setup(call->dev, call->msg.m_lbdev_lblockdriver_msg.request,
|
||
|
(char *) call->vec[0].iov_addr, call->msg.m_lbdev_lblockdriver_msg.user,
|
||
|
&call->msg);
|
||
|
|
||
|
break;
|
||
|
|
||
|
default:
|
||
|
assert(0);
|
||
|
}
|
||
|
|
||
|
if (r != OK)
|
||
|
return r;
|
||
|
|
||
|
/* Try to resend the request. */
|
||
|
return bdev_senda(call->dev, &call->msg, call->id);
|
||
|
}
|