cmd/sharefs: rename fuse-helper to fuse-operations

This is not really just library wrapper functions, but instead implements the callbacks, so fuse-operations makes more sense.

Signed-off-by: Ophestra <cat@gensokyo.uk>

1 files changed, 0 insertions, 282 deletions

diff --git a/cmd/sharefs/fuse-helper.c b/cmd/sharefs/fuse-helper.c
deleted file mode 100644
index a1c511b4..00000000
--- a/cmd/sharefs/fuse-helper.c
+++ /dev/null
@@ -1,282 +0,0 @@
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE /* O_DIRECT */
-#endif
-
-#include <dirent.h>
-#include <errno.h>
-#include <unistd.h>
-
-/* TODO(ophestra): remove after 05ce67fea99ca09cd4b6625cff7aec9cc222dd5a reaches a release */
-#include <sys/syscall.h>
-
-#include "fuse-helper.h"
-
-/* MUST_TRANSLATE_PATHNAME translates a userspace pathname to a relative pathname;
- * the resulting address points to a constant string or part of pathname, it is never heap allocated. */
-#define MUST_TRANSLATE_PATHNAME(pathname) \
-    do {                                  \
-        if (pathname == NULL)             \
-            return -EINVAL;               \
-        while (*pathname == '/')          \
-            pathname++;                   \
-        if (*pathname == '\0')            \
-            pathname = ".";               \
-    } while (0)
-
-/* GET_CONTEXT_PRIV obtains fuse context and private data for the calling thread. */
-#define GET_CONTEXT_PRIV(ctx, priv) \
-    do {                            \
-        ctx = fuse_get_context();   \
-        priv = ctx->private_data;   \
-    } while (0)
-
-/* impl_getattr modifies a struct stat from the kernel to present to userspace;
- * impl_getattr returns a negative errno style error code. */
-static int impl_getattr(struct fuse_context *ctx, struct stat *statbuf) {
-    /* allowlist of permitted types */
-    if (!S_ISDIR(statbuf->st_mode) && !S_ISREG(statbuf->st_mode) && !S_ISLNK(statbuf->st_mode)) {
-        return -ENOTRECOVERABLE; /* returning an errno causes all operations on the file to return EIO */
-    }
-
-#define OVERRIDE_PERM(v) (statbuf->st_mode & ~0777) | (v & 0777)
-    if (S_ISDIR(statbuf->st_mode))
-        statbuf->st_mode = OVERRIDE_PERM(SHAREFS_PERM_DIR);
-    else if (S_ISREG(statbuf->st_mode))
-        statbuf->st_mode = OVERRIDE_PERM(SHAREFS_PERM_REG);
-    else
-        statbuf->st_mode = 0; /* should always be symlink in this case */
-
-    statbuf->st_uid = ctx->uid;
-    statbuf->st_gid = SHAREFS_MEDIA_RW_ID;
-    statbuf->st_ctim = statbuf->st_mtim;
-    statbuf->st_nlink = 1;
-    return 0;
-}
-
-/* fuse_operations implementation */
-
-int sharefs_getattr(const char *pathname, struct stat *statbuf, struct fuse_file_info *fi) {
-    struct fuse_context *ctx;
-    struct sharefs_private *priv;
-    GET_CONTEXT_PRIV(ctx, priv);
-    MUST_TRANSLATE_PATHNAME(pathname);
-
-    (void)fi;
-
-    if (fstatat(priv->dirfd, pathname, statbuf, AT_SYMLINK_NOFOLLOW) == -1)
-        return -errno;
-    return impl_getattr(ctx, statbuf);
-}
-
-int sharefs_readdir(const char *pathname, void *buf, fuse_fill_dir_t filler, off_t offset, struct fuse_file_info *fi, enum fuse_readdir_flags flags) {
-    int fd;
-    DIR *dp;
-    struct stat st;
-    int ret = 0;
-    struct dirent *de;
-
-    struct fuse_context *ctx;
-    struct sharefs_private *priv;
-    GET_CONTEXT_PRIV(ctx, priv);
-    MUST_TRANSLATE_PATHNAME(pathname);
-
-    (void)offset;
-    (void)fi;
-
-    if ((fd = openat(priv->dirfd, pathname, O_RDONLY | O_DIRECTORY | O_CLOEXEC)) == -1)
-        return -errno;
-    if ((dp = fdopendir(fd)) == NULL) {
-        close(fd);
-        return -errno;
-    }
-
-    errno = 0; /* for the next readdir call */
-    while ((de = readdir(dp)) != NULL) {
-        if (flags & FUSE_READDIR_PLUS) {
-            if (fstatat(dirfd(dp), de->d_name, &st, AT_SYMLINK_NOFOLLOW) == -1) {
-                ret = -errno;
-                break;
-            }
-
-            if ((ret = impl_getattr(ctx, &st)) < 0)
-                break;
-
-            errno = 0;
-            ret = filler(buf, de->d_name, &st, 0, FUSE_FILL_DIR_PLUS);
-        } else
-            ret = filler(buf, de->d_name, NULL, 0, 0);
-
-        if (ret != 0) {
-            ret = errno != 0 ? -errno : -EIO; /* filler */
-            break;
-        }
-
-        errno = 0; /* for the next readdir call */
-    }
-    if (ret == 0 && errno != 0)
-        ret = -errno; /* readdir */
-
-    closedir(dp);
-    return ret;
-}
-
-int sharefs_mkdir(const char *pathname, mode_t mode) {
-    struct fuse_context *ctx;
-    struct sharefs_private *priv;
-    GET_CONTEXT_PRIV(ctx, priv);
-    MUST_TRANSLATE_PATHNAME(pathname);
-
-    (void)mode;
-
-    if (mkdirat(priv->dirfd, pathname, SHAREFS_PERM_DIR) == -1)
-        return -errno;
-    return 0;
-}
-
-int sharefs_unlink(const char *pathname) {
-    struct fuse_context *ctx;
-    struct sharefs_private *priv;
-    GET_CONTEXT_PRIV(ctx, priv);
-    MUST_TRANSLATE_PATHNAME(pathname);
-
-    if (unlinkat(priv->dirfd, pathname, 0) == -1)
-        return -errno;
-    return 0;
-}
-
-int sharefs_rmdir(const char *pathname) {
-    struct fuse_context *ctx;
-    struct sharefs_private *priv;
-    GET_CONTEXT_PRIV(ctx, priv);
-    MUST_TRANSLATE_PATHNAME(pathname);
-
-    if (unlinkat(priv->dirfd, pathname, AT_REMOVEDIR) == -1)
-        return -errno;
-    return 0;
-}
-
-int sharefs_rename(const char *oldpath, const char *newpath, unsigned int flags) {
-    struct fuse_context *ctx;
-    struct sharefs_private *priv;
-    GET_CONTEXT_PRIV(ctx, priv);
-    MUST_TRANSLATE_PATHNAME(oldpath);
-    MUST_TRANSLATE_PATHNAME(newpath);
-
-    /* TODO(ophestra): replace with wrapper after 05ce67fea99ca09cd4b6625cff7aec9cc222dd5a reaches a release */
-    if (syscall(__NR_renameat2, priv->dirfd, oldpath, priv->dirfd, newpath, flags) == -1)
-        return -errno;
-    return 0;
-}
-
-int sharefs_truncate(const char *pathname, off_t length, struct fuse_file_info *fi) {
-    int fd;
-    int ret;
-
-    struct fuse_context *ctx;
-    struct sharefs_private *priv;
-    GET_CONTEXT_PRIV(ctx, priv);
-    MUST_TRANSLATE_PATHNAME(pathname);
-
-    (void)fi;
-
-    if ((fd = openat(priv->dirfd, pathname, O_WRONLY | O_CLOEXEC)) == -1)
-        return -errno;
-    if ((ret = ftruncate(fd, length)) == -1)
-        ret = -errno;
-    close(fd);
-    return ret;
-}
-
-int sharefs_utimens(const char *pathname, const struct timespec times[2], struct fuse_file_info *fi) {
-    struct fuse_context *ctx;
-    struct sharefs_private *priv;
-    GET_CONTEXT_PRIV(ctx, priv);
-    MUST_TRANSLATE_PATHNAME(pathname);
-
-    (void)fi;
-
-    if (utimensat(priv->dirfd, pathname, times, AT_SYMLINK_NOFOLLOW) == -1)
-        return -errno;
-    return 0;
-}
-
-int sharefs_create(const char *pathname, mode_t mode, struct fuse_file_info *fi) {
-    int fd;
-
-    struct fuse_context *ctx;
-    struct sharefs_private *priv;
-    GET_CONTEXT_PRIV(ctx, priv);
-    MUST_TRANSLATE_PATHNAME(pathname);
-
-    (void)mode;
-
-    if ((fd = openat(priv->dirfd, pathname, fi->flags & ~SHAREFS_FORBIDDEN_FLAGS, SHAREFS_PERM_REG)) == -1)
-        return -errno;
-    fi->fh = fd;
-    return 0;
-}
-
-int sharefs_open(const char *pathname, struct fuse_file_info *fi) {
-    int fd;
-
-    struct fuse_context *ctx;
-    struct sharefs_private *priv;
-    GET_CONTEXT_PRIV(ctx, priv);
-    MUST_TRANSLATE_PATHNAME(pathname);
-
-    if ((fd = openat(priv->dirfd, pathname, fi->flags & ~SHAREFS_FORBIDDEN_FLAGS)) == -1)
-        return -errno;
-    fi->fh = fd;
-    return 0;
-}
-
-int sharefs_read(const char *pathname, char *buf, size_t count, off_t offset, struct fuse_file_info *fi) {
-    int ret;
-
-    (void)pathname;
-
-    if ((ret = pread(fi->fh, buf, count, offset)) == -1)
-        return -errno;
-    return ret;
-}
-
-int sharefs_write(const char *pathname, const char *buf, size_t count, off_t offset, struct fuse_file_info *fi) {
-    int ret;
-
-    (void)pathname;
-
-    if ((ret = pwrite(fi->fh, buf, count, offset)) == -1)
-        return -errno;
-    return ret;
-}
-
-int sharefs_statfs(const char *pathname, struct statvfs *statbuf) {
-    int fd;
-    int ret;
-
-    struct fuse_context *ctx;
-    struct sharefs_private *priv;
-    GET_CONTEXT_PRIV(ctx, priv);
-    MUST_TRANSLATE_PATHNAME(pathname);
-
-    if ((fd = openat(priv->dirfd, pathname, O_RDONLY | O_CLOEXEC)) == -1)
-        return -errno;
-    if ((ret = fstatvfs(fd, statbuf)) == -1)
-        ret = -errno;
-    close(fd);
-    return ret;
-}
-
-int sharefs_release(const char *pathname, struct fuse_file_info *fi) {
-    (void)pathname;
-
-    return close(fi->fh);
-}
-
-int sharefs_fsync(const char *pathname, int datasync, struct fuse_file_info *fi) {
-    (void)pathname;
-
-    if (datasync ? fdatasync(fi->fh) : fsync(fi->fh) == -1)
-        return -errno;
-    return 0;
-}