122 lines
3 KiB
C
122 lines
3 KiB
C
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/* Part of libvboxfs - (c) 2012, D.C. van Moolenbroek */
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#include "inc.h"
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/*
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* Create or open a file or directory.
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*/
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int
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vboxfs_open_file(char *path, int flags, int mode, vboxfs_handle_t *handlep,
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vboxfs_objinfo_t *infop)
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{
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vbox_param_t param[3];
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vboxfs_path_t pathbuf;
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vboxfs_crinfo_t crinfo;
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int r, dir, rflag, wflag;
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if ((r = vboxfs_set_path(&pathbuf, path)) != OK)
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return r;
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memset(&crinfo, 0, sizeof(crinfo));
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/*
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* Note that the mode may not be set at all. If no new file may be
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* created, this is not a problem. The following test succeeds only if
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* the caller explicitly specified that a directory is involved.
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*/
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dir = S_ISDIR(mode);
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/* Convert open(2) flags to VirtualBox creation flags. */
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if (flags & O_APPEND)
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return EINVAL; /* not supported at this time */
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if (flags & O_CREAT) {
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crinfo.flags = VBOXFS_CRFLAG_CREATE_IF_NEW;
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if (flags & O_EXCL)
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crinfo.flags |= VBOXFS_CRFLAG_FAIL_IF_EXISTS;
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else if (flags & O_TRUNC)
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crinfo.flags |= VBOXFS_CRFLAG_TRUNC_IF_EXISTS;
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else
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crinfo.flags |= VBOXFS_CRFLAG_OPEN_IF_EXISTS;
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} else {
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crinfo.flags = VBOXFS_CRFLAG_FAIL_IF_NEW;
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if (flags & O_TRUNC)
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crinfo.flags |= VBOXFS_CRFLAG_TRUNC_IF_EXISTS;
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else
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crinfo.flags |= VBOXFS_CRFLAG_OPEN_IF_EXISTS;
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}
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/*
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* If an object information structure is given, open the file only to
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* retrieve or change its attributes.
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*/
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if (infop != NULL) {
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rflag = VBOXFS_CRFLAG_READ_ATTR;
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wflag = VBOXFS_CRFLAG_WRITE_ATTR;
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} else {
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rflag = VBOXFS_CRFLAG_READ;
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wflag = VBOXFS_CRFLAG_WRITE;
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}
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switch (flags & O_ACCMODE) {
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case O_RDONLY: crinfo.flags |= rflag; break;
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case O_WRONLY: crinfo.flags |= wflag; break;
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case O_RDWR: crinfo.flags |= rflag | wflag; break;
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default: return EINVAL;
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}
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if (S_ISDIR(mode))
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crinfo.flags |= VBOXFS_CRFLAG_DIRECTORY;
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crinfo.info.attr.mode = VBOXFS_SET_MODE(dir ? S_IFDIR : S_IFREG, mode);
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crinfo.info.attr.add = VBOXFS_OBJATTR_ADD_NONE;
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vbox_set_u32(¶m[0], vboxfs_root);
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vbox_set_ptr(¶m[1], &pathbuf, vboxfs_get_path_size(&pathbuf),
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VBOX_DIR_OUT);
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vbox_set_ptr(¶m[2], &crinfo, sizeof(crinfo), VBOX_DIR_INOUT);
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r = vbox_call(vboxfs_conn, VBOXFS_CALL_CREATE, param, 3, NULL);
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if (r != OK)
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return r;
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if (crinfo.handle == VBOXFS_INVALID_HANDLE) {
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switch (crinfo.result) {
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case VBOXFS_PATH_NOT_FOUND:
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/*
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* This could also mean ENOTDIR, but there does not
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* appear to be any way to distinguish that case.
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* Verifying with extra lookups seems overkill.
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*/
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case VBOXFS_FILE_NOT_FOUND:
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return ENOENT;
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case VBOXFS_FILE_EXISTS:
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return EEXIST;
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default:
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return EIO; /* should never happen */
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}
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}
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*handlep = crinfo.handle;
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if (infop != NULL)
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*infop = crinfo.info;
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return OK;
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}
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/*
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* Close an open file handle.
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*/
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void
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vboxfs_close_file(vboxfs_handle_t handle)
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{
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vbox_param_t param[2];
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vbox_set_u32(¶m[0], vboxfs_root);
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vbox_set_u64(¶m[1], handle);
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/* Ignore errors here. We cannot do anything with them anyway. */
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(void) vbox_call(vboxfs_conn, VBOXFS_CALL_CLOSE, param, 2, NULL);
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}
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