From ec2da40e65346bd5d3055777a76852892da21ea7 Mon Sep 17 00:00:00 2001 From: Ian Moffett Date: Fri, 15 Mar 2024 12:18:16 -0400 Subject: kernel: vfs: Implement vfs_path_to_node() Signed-off-by: Ian Moffett --- sys/kern/vfs_lookup.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 55 insertions(+), 4 deletions(-) (limited to 'sys/kern') diff --git a/sys/kern/vfs_lookup.c b/sys/kern/vfs_lookup.c index 7d20bd2..1398964 100644 --- a/sys/kern/vfs_lookup.c +++ b/sys/kern/vfs_lookup.c @@ -29,6 +29,8 @@ #include #include +#include +#include #include #include @@ -115,9 +117,58 @@ vfs_get_fname_at(const char *path, size_t idx) return ret; } -struct vnode * -vfs_path_to_node(const char *path) +/* + * Fetches a vnode from a path. + * + * @path: Path to fetch vnode from. + * @vp: Output var for fetched vnode. + * + * Returns 0 on success. + */ +int +vfs_path_to_node(const char *path, struct vnode **vp) { - /* TODO */ - return NULL; + struct vnode *vnode = g_root_vnode; + struct fs_info *fs; + char *name; + int s = 0, fs_caps = 0; + + if (strcmp(path, "/") == 0 || !vfs_is_valid_path(path)) { + return -1; + } else if (*path != '/') { + return -1; + } + + /* Fetch filesystem capabilities if we can */ + if (vnode->fs != NULL) { + fs = vnode->fs; + fs_caps = fs->caps; + } + + /* + * If the filesystem requires full-path lookups, we can try + * throwing the full path at the filesystem to see if + * it'll give us a vnode. + */ + if (__TEST(fs_caps, FSCAP_FULLPATH)) { + s = vfs_vget(g_root_vnode, path, &vnode); + goto done; + } + + for (size_t i = 0;; ++i) { + name = vfs_get_fname_at(path, i); + if (name == NULL) break; + + s = vfs_vget(vnode, name, &vnode); + dynfree(name); + + if (s != 0) break; + } + +done: + if (vp != NULL && s == 0) { + *vp = vnode; + } + + return s; } -- cgit v1.2.3