165 lines
4 KiB
C
165 lines
4 KiB
C
/* Created (MFS based):
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* February 2010 (Evgeniy Ivanov)
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*/
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#include "fs.h"
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#include <stddef.h>
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#include <string.h>
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#include <stdlib.h>
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#include <dirent.h>
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#include <assert.h>
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#include <sys/param.h>
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#include "puffs.h"
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#include "puffs_priv.h"
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#define GETDENTS_BUFSIZ 4096
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static char getdents_buf[GETDENTS_BUFSIZ];
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#define RW_BUFSIZ (128 * 1024)
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static char rw_buf[RW_BUFSIZ];
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/*===========================================================================*
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* fs_read *
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*===========================================================================*/
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ssize_t fs_read(ino_t ino_nr, struct fsdriver_data *data, size_t bytes,
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off_t pos, int call)
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{
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int r;
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size_t bytes_left, bytes_done;
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struct puffs_node *pn;
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PUFFS_MAKECRED(pcr, &global_kcred);
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if ((pn = puffs_pn_nodewalk(global_pu, 0, &ino_nr)) == NULL) {
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lpuffs_debug("walk failed...\n");
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return(EINVAL);
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}
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if (bytes > sizeof(rw_buf))
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bytes = sizeof(rw_buf);
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bytes_left = bytes;
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if (global_pu->pu_ops.puffs_node_read == NULL)
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return(EINVAL);
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r = global_pu->pu_ops.puffs_node_read(global_pu, pn, (uint8_t *)rw_buf,
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pos, &bytes_left, pcr, 0);
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if (r) {
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lpuffs_debug("puffs_node_read failed\n");
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return(EINVAL);
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}
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bytes_done = bytes - bytes_left;
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if (bytes_done > 0) {
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if ((r = fsdriver_copyout(data, 0, rw_buf, bytes_done)) != OK)
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return r;
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update_timens(pn, ATIME, NULL);
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}
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return (ssize_t)bytes_done;
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}
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/*===========================================================================*
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* fs_write *
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*===========================================================================*/
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ssize_t fs_write(ino_t ino_nr, struct fsdriver_data *data, size_t bytes,
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off_t pos, int call)
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{
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int r;
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size_t bytes_left;
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struct puffs_node *pn;
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struct vattr va;
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PUFFS_MAKECRED(pcr, &global_kcred);
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if ((pn = puffs_pn_nodewalk(global_pu, 0, &ino_nr)) == NULL) {
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lpuffs_debug("walk failed...\n");
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return(EINVAL);
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}
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if (bytes > sizeof(rw_buf))
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bytes = sizeof(rw_buf);
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bytes_left = bytes;
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/* At first try to change vattr */
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if (global_pu->pu_ops.puffs_node_setattr == NULL)
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return(EINVAL);
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puffs_vattr_null(&va);
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if ((u_quad_t)(pos + bytes_left) > pn->pn_va.va_size)
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va.va_size = bytes_left + pos;
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va.va_ctime = va.va_mtime = clock_timespec();
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va.va_atime = pn->pn_va.va_atime;
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r = global_pu->pu_ops.puffs_node_setattr(global_pu, pn, &va, pcr);
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if (r) return(EINVAL);
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if ((r = fsdriver_copyin(data, 0, rw_buf, bytes)) != OK)
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return r;
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if (global_pu->pu_ops.puffs_node_write == NULL)
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return(EINVAL);
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r = global_pu->pu_ops.puffs_node_write(global_pu, pn, (uint8_t *)rw_buf,
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pos, &bytes_left, pcr, 0);
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if (r != OK) return(EINVAL);
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return (ssize_t)(bytes - bytes_left);
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}
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/*===========================================================================*
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* fs_getdents *
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*===========================================================================*/
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ssize_t fs_getdents(ino_t ino_nr, struct fsdriver_data *data, size_t bytes,
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off_t *pos)
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{
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int r;
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register struct puffs_node *pn;
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size_t buf_left, written;
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struct dirent *dent;
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int eofflag = 0;
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PUFFS_MAKECRED(pcr, &global_kcred);
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if ((pn = puffs_pn_nodewalk(global_pu, 0, &ino_nr)) == NULL) {
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lpuffs_debug("walk failed...\n");
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return(EINVAL);
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}
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if (bytes > sizeof(getdents_buf))
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bytes = sizeof(getdents_buf);
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memset(getdents_buf, 0, sizeof(getdents_buf)); /* Avoid leaking any data */
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buf_left = bytes;
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dent = (struct dirent*) getdents_buf;
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r = global_pu->pu_ops.puffs_node_readdir(global_pu, pn, dent, pos,
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&buf_left, pcr, &eofflag, 0, 0);
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if (r) {
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lpuffs_debug("puffs_node_readdir returned error\n");
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return(EINVAL);
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}
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assert(buf_left <= bytes);
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written = bytes - buf_left;
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if (written == 0 && !eofflag) {
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lpuffs_debug("The user's buffer is too small\n");
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return(EINVAL);
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}
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if (written) {
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if ((r = fsdriver_copyout(data, 0, getdents_buf, written)) != OK)
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return r;
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}
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update_timens(pn, ATIME, NULL);
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/* The puffs readdir call has already updated the position. */
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return written;
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}
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