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nfs: Support multiple mounts with the same path basename

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NFSv4 mounts NFS file systems to the flat root of a pseudo file
system. This change allow the same basename to be used.
This commit is contained in:
Chris Johns
2023-07-21 14:40:16 +10:00
parent 1dfdee9ce9
commit f55a3dd32f
2 changed files with 37 additions and 26 deletions
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32
rtemsbsd/rtems/rtems-bsd-syscall-api.c
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@@ -889,6 +889,7 @@ rtems_bsd_sysgen_open_node(
struct vnode *cdir;
struct vnode *rdir;
const char *opath;
rtems_filesystem_location_info_t *rootloc;
int opathlen;
int fd;
int error;
@@ -902,6 +903,8 @@ rtems_bsd_sysgen_open_node(
fdp = td->td_proc->p_fd;
rootloc = &iop->pathinfo.mt_entry->mt_fs_root->location;
/*
* There is no easy or clean means to open a vnode and follow the
* POSIX open semantics. See `kern_openat`. You can open a vnode but
@@ -912,11 +915,16 @@ rtems_bsd_sysgen_open_node(
* parent directory vnode to position ourselves in the parent
* directory. The pathloc vnode points to the '.' or '..' directory.
*/
opath = path + strlen(path);
opathlen = 0;
while (opath != path && !rtems_filesystem_is_delimiter(opath[-1])) {
opath--;
opathlen++;
if (rtems_bsd_libio_loc_to_vnode(&iop->pathinfo) ==
rtems_bsd_libio_loc_to_vnode(rootloc)) {
opath = ".";
} else {
opath = path + strlen(path);
opathlen = 0;
while (opath != path && !rtems_filesystem_is_delimiter(opath[-1])) {
opath--;
opathlen++;
}
}
if (rtems_filesystem_is_current_directory(opath, opathlen) ||
rtems_filesystem_is_parent_directory(opath, opathlen)) {
@@ -929,8 +937,6 @@ rtems_bsd_sysgen_open_node(
opath = ".";
cdir = rtems_bsd_libio_loc_to_vnode(&iop->pathinfo);
} else {
rtems_filesystem_location_info_t *rootloc =
&iop->pathinfo.mt_entry->mt_fs_root->location;
/*
* We need the parent directory so open can find the
* entry. If we are creating the file the pathinfo
@@ -943,18 +949,6 @@ rtems_bsd_sysgen_open_node(
}
if (fdp->fd_cdir == NULL) {
cdir = rtems_bsd_libio_loc_to_vnode_dir(rootloc);
} else if (rtems_bsd_libio_loc_to_vnode(&iop->pathinfo) ==
rtems_bsd_libio_loc_to_vnode(rootloc)) {
/*
* If this is a directory and this is the root node of
* the mounted file system we need to move up the
* hidden pseudo file system node.
*/
if (isdir) {
cdir = rootvnode;
} else {
cdir = rtems_bsd_libio_loc_to_vnode(rootloc);
}
}
}