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Directory iteration should happen relative to that file, which lends itself well to mapping this to openat and friends. Add support for these to barebox in preparation. Signed-off-by: Ahmad Fatoum --- commands/readlink.c | 2 +- fs/fs.c | 140 +++++++++++++++++++++++++------------------- include/fcntl.h | 14 ++++- include/fs.h | 2 +- include/sys/stat.h | 8 ++- include/unistd.h | 35 +++++++++-- 6 files changed, 132 insertions(+), 69 deletions(-) diff --git a/commands/readlink.c b/commands/readlink.c index 81ad25c733ab..55f8249028e1 100644 --- a/commands/readlink.c +++ b/commands/readlink.c @@ -31,7 +31,7 @@ static int do_readlink(int argc, char *argv[]) return COMMAND_ERROR_USAGE; if (canonicalize) { - char *buf = canonicalize_path(argv[optind]); + char *buf = canonicalize_path(AT_FDCWD, argv[optind]); struct stat s; if (!buf) diff --git a/fs/fs.c b/fs/fs.c index bf527f1b2d9b..6b71440318af 100644 --- a/fs/fs.c +++ b/fs/fs.c @@ -130,10 +130,11 @@ void cdev_print(const struct cdev *cdev) } EXPORT_SYMBOL(cdev_print); -static struct fs_device *get_fsdevice_by_path(const char *path); +static struct fs_device *get_fsdevice_by_path(int dirfd, const char *path); void stat_print(const char *filename, const struct stat *st) { + int dirfd = AT_FDCWD; struct block_device *bdev = NULL; struct fs_device *fdev; struct cdev *cdev = NULL; @@ -156,7 +157,7 @@ void stat_print(const char *filename, const struct stat *st) if (st->st_mode & S_IFCHR) { char *path; - path = canonicalize_path(filename); + path = canonicalize_path(dirfd, filename); if (path) { const char *devicefile = devpath_to_name(path); struct cdev *lcdev; @@ -198,7 +199,7 @@ void stat_print(const char *filename, const struct stat *st) if (type) printf(" %s%s", typeprefix, type); - fdev = get_fsdevice_by_path(filename); + fdev = get_fsdevice_by_path(dirfd, filename); printf("\nDevice: %s\tInode: %lu\n", fdev ? dev_name(&fdev->dev) : "", @@ -235,7 +236,7 @@ postcore_initcall(init_fs); struct filename; -static int filename_lookup(struct filename *name, unsigned flags, +static int filename_lookup(int dirfd, struct filename *name, unsigned flags, struct path *path);; static struct filename *getname(const char *filename); static void path_put(const struct path *path); @@ -282,7 +283,7 @@ struct cdev *get_cdev_by_mountpath(const char *path) { struct fs_device *fsdev; - fsdev = get_fsdevice_by_path(path); + fsdev = get_fsdevice_by_path(AT_FDCWD, path); if (!fsdev) return NULL; @@ -293,7 +294,7 @@ char *get_mounted_path(const char *path) { struct fs_device *fdev; - fdev = get_fsdevice_by_path(path); + fdev = get_fsdevice_by_path(AT_FDCWD, path); if (!fdev) return NULL; @@ -828,7 +829,7 @@ static void fs_remove(struct device *dev) if (fsdev->loop && fsdev->cdev) { cdev_remove_loop(fsdev->cdev); - ret = filename_lookup(getname(fsdev->backingstore), + ret = filename_lookup(AT_FDCWD, getname(fsdev->backingstore), LOOKUP_FOLLOW, &path); if (!ret) { mntput(path.mnt); @@ -912,7 +913,7 @@ int fsdev_open_cdev(struct fs_device *fsdev) parseopt_b(fsdev->options, "loop", &fsdev->loop); parseopt_llu_suffix(fsdev->options, "offset", &offset); if (fsdev->loop) { - ret = filename_lookup(getname(fsdev->backingstore), + ret = filename_lookup(AT_FDCWD, getname(fsdev->backingstore), LOOKUP_FOLLOW, &path); if (ret) return ret; @@ -1194,7 +1195,7 @@ char *path_get_linux_rootarg(const char *path) struct fs_device *fsdev; const char *str; - fsdev = get_fsdevice_by_path(path); + fsdev = get_fsdevice_by_path(AT_FDCWD, path); if (!fsdev) return ERR_PTR(-EINVAL); @@ -1217,7 +1218,7 @@ bool __is_tftp_fs(const char *path) { struct fs_device *fsdev; - fsdev = get_fsdevice_by_path(path); + fsdev = get_fsdevice_by_path(AT_FDCWD, path); if (!fsdev) return false; @@ -2156,9 +2157,10 @@ static int link_path_walk(const char *name, struct nameidata *nd) } } -static const char *path_init(struct nameidata *nd, unsigned flags) +static const char *path_init(int dirfd, struct nameidata *nd, unsigned flags) { const char *s = nd->name->name; + FILE *f = NULL; nd->last_type = LAST_ROOT; /* if there are only slashes... */ nd->flags = flags | LOOKUP_JUMPED | LOOKUP_PARENT; @@ -2167,12 +2169,23 @@ static const char *path_init(struct nameidata *nd, unsigned flags) nd->path.mnt = NULL; nd->path.dentry = NULL; + /* We don't check for error here yet, as POSIX allows checking + * whether paths are absolute with openat(-1, path, O_PATH) + */ + if (dirfd != AT_FDCWD) + f = fd_to_file(dirfd); + if (*s == '/') { get_root(&nd->path); - return s; - } else { + } else if (dirfd == AT_FDCWD) { get_pwd(&nd->path); - return s; + } else { + if (IS_ERR(f)) + return ERR_CAST(f); + + nd->path.mnt = &f->fsdev->vfsmount; + nd->path.dentry = f->dentry; + follow_mount(&nd->path); } return s; @@ -2210,10 +2223,10 @@ static void terminate_walk(struct nameidata *nd) } /* Returns 0 and nd will be valid on success; Retuns error, otherwise. */ -static int path_parentat(struct nameidata *nd, unsigned flags, +static int path_parentat(int dirfd, struct nameidata *nd, unsigned flags, struct path *parent) { - const char *s = path_init(nd, flags); + const char *s = path_init(dirfd, nd, flags); int err; if (IS_ERR(s)) @@ -2229,7 +2242,8 @@ static int path_parentat(struct nameidata *nd, unsigned flags, return err; } -static struct filename *filename_parentat(struct filename *name, +static struct filename *filename_parentat(int dirfd, + struct filename *name, unsigned int flags, struct path *parent, struct qstr *last, int *type) { @@ -2241,7 +2255,7 @@ static struct filename *filename_parentat(struct filename *name, set_nameidata(&nd, name); - retval = path_parentat(&nd, flags, parent); + retval = path_parentat(dirfd, &nd, flags, parent); if (likely(!retval)) { *last = nd.last; *type = nd.last_type; @@ -2253,7 +2267,7 @@ static struct filename *filename_parentat(struct filename *name, return name; } -static struct dentry *filename_create(struct filename *name, +static struct dentry *filename_create(int dirfd, struct filename *name, struct path *path, unsigned int lookup_flags) { struct dentry *dentry = ERR_PTR(-EEXIST); @@ -2262,7 +2276,7 @@ static struct dentry *filename_create(struct filename *name, int error; bool is_dir = (lookup_flags & LOOKUP_DIRECTORY); - name = filename_parentat(name, 0, path, &last, &type); + name = filename_parentat(dirfd, name, 0, path, &last, &type); if (IS_ERR(name)) return ERR_CAST(name); @@ -2306,7 +2320,7 @@ static struct dentry *filename_create(struct filename *name, return dentry; } -static int filename_lookup(struct filename *name, unsigned flags, +static int filename_lookup(int dirfd, struct filename *name, unsigned flags, struct path *path) { int err; @@ -2318,7 +2332,7 @@ static int filename_lookup(struct filename *name, unsigned flags, set_nameidata(&nd, name); - s = path_init(&nd, flags); + s = path_init(dirfd, &nd, flags); if (IS_ERR(s)) return PTR_ERR(s); @@ -2345,13 +2359,13 @@ static int filename_lookup(struct filename *name, unsigned flags, return err; } -static struct fs_device *get_fsdevice_by_path(const char *pathname) +static struct fs_device *get_fsdevice_by_path(int dirfd, const char *pathname) { struct fs_device *fsdev; struct path path; int ret; - ret = filename_lookup(getname(pathname), 0, &path); + ret = filename_lookup(dirfd, getname(pathname), 0, &path); if (ret) return NULL; @@ -2403,14 +2417,14 @@ static int vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) /* libfs.c */ /* ---------------------------------------------------------------- */ -int mkdir (const char *pathname, mode_t mode) +int mkdirat(int dirfd, const char *pathname, mode_t mode) { struct dentry *dentry; struct path path; int error; unsigned int lookup_flags = LOOKUP_DIRECTORY; - dentry = filename_create(getname(pathname), &path, lookup_flags); + dentry = filename_create(dirfd, getname(pathname), &path, lookup_flags); if (IS_ERR(dentry)) { error = PTR_ERR(dentry); goto out; @@ -2423,9 +2437,9 @@ int mkdir (const char *pathname, mode_t mode) out: return errno_set(error); } -EXPORT_SYMBOL(mkdir); +EXPORT_SYMBOL(mkdirat); -int rmdir (const char *pathname) +static int rmdirat(int dirfd, const char *pathname) { int error = 0; struct filename *name; @@ -2434,7 +2448,7 @@ int rmdir (const char *pathname) struct qstr last; int type; - name = filename_parentat(getname(pathname), 0, + name = filename_parentat(dirfd, getname(pathname), 0, &path, &last, &type); if (IS_ERR(name)) return PTR_ERR(name); @@ -2475,9 +2489,8 @@ int rmdir (const char *pathname) return errno_set(error); } -EXPORT_SYMBOL(rmdir); -int open(const char *pathname, int flags, ...) +int openat(int dirfd, const char *pathname, int flags) { struct fs_device *fsdev; struct fs_driver *fsdrv; @@ -2491,7 +2504,7 @@ int open(const char *pathname, int flags, ...) struct filename *filename; if (flags & O_TMPFILE) { - fsdev = get_fsdevice_by_path(pathname); + fsdev = get_fsdevice_by_path(dirfd, pathname); if (!fsdev) { errno = ENOENT; return -errno; @@ -2525,7 +2538,7 @@ int open(const char *pathname, int flags, ...) set_nameidata(&nd, filename); - s = path_init(&nd, LOOKUP_FOLLOW); + s = path_init(dirfd, &nd, LOOKUP_FOLLOW); if (IS_ERR(s)) return PTR_ERR(s); @@ -2592,7 +2605,7 @@ int open(const char *pathname, int flags, ...) goto out1; } - f->path = xstrdup(pathname); + f->path = dpath(dentry, d_root); f->dentry = dentry; f->f_inode = iget(inode); f->flags = flags; @@ -2631,7 +2644,7 @@ int open(const char *pathname, int flags, ...) out1: return errno_set(error); } -EXPORT_SYMBOL(open); +EXPORT_SYMBOL(openat); static const char *fd_getpath(int fd) { @@ -2647,14 +2660,19 @@ static const char *fd_getpath(int fd) return f->path; } -int unlink(const char *pathname) +int unlinkat(int dirfd, const char *pathname, int flags) { int ret; struct dentry *dentry; struct inode *inode; struct path path; - ret = filename_lookup(getname(pathname), 0, &path); + if (flags == AT_REMOVEDIR) + return rmdirat(dirfd, pathname); + if (flags) + return -EINVAL; + + ret = filename_lookup(dirfd, getname(pathname), 0, &path); if (ret) goto out; @@ -2683,7 +2701,7 @@ int unlink(const char *pathname) out: return errno_set(ret); } -EXPORT_SYMBOL(unlink); +EXPORT_SYMBOL(unlinkat); static int vfs_symlink(struct inode *dir, struct dentry *dentry, const char *oldname) { @@ -2700,7 +2718,7 @@ int symlink(const char *pathname, const char *newpath) int error; unsigned int lookup_flags = LOOKUP_DIRECTORY; - dentry = filename_create(getname(newpath), &path, lookup_flags); + dentry = filename_create(AT_FDCWD, getname(newpath), &path, lookup_flags); if (IS_ERR(dentry)) { error = PTR_ERR(dentry); goto out; @@ -2757,7 +2775,7 @@ DIR *opendir(const char *pathname) DIR *d; struct path path = {}; - ret = filename_lookup(getname(pathname), + ret = filename_lookup(AT_FDCWD, getname(pathname), LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path); if (ret) goto out; @@ -2844,7 +2862,7 @@ int rewinddir(DIR *dir) } EXPORT_SYMBOL(rewinddir); -int readlink(const char *pathname, char *buf, size_t bufsiz) +int readlinkat(int dirfd, const char *pathname, char *buf, size_t bufsiz) { int ret; struct dentry *dentry; @@ -2852,7 +2870,7 @@ int readlink(const char *pathname, char *buf, size_t bufsiz) const char *link; struct path path = {}; - ret = filename_lookup(getname(pathname), 0, &path); + ret = filename_lookup(dirfd, getname(pathname), 0, &path); if (ret) goto out; @@ -2884,16 +2902,16 @@ int readlink(const char *pathname, char *buf, size_t bufsiz) out: return errno_set(ret); } -EXPORT_SYMBOL(readlink); +EXPORT_SYMBOL(readlinkat); -static int stat_filename(const char *filename, struct stat *s, unsigned int flags) +static int stat_filename(int dirfd, const char *filename, struct stat *s, unsigned int flags) { int ret; struct dentry *dentry; struct inode *inode; struct path path = {}; - ret = filename_lookup(getname(filename), flags, &path); + ret = filename_lookup(dirfd, getname(filename), flags, &path); if (ret) goto out; @@ -2915,17 +2933,17 @@ static int stat_filename(const char *filename, struct stat *s, unsigned int flag return errno_set(ret); } -int stat(const char *filename, struct stat *s) +int statat(int dirfd, const char *filename, struct stat *s) { - return stat_filename(filename, s, LOOKUP_FOLLOW); + return stat_filename(dirfd, filename, s, LOOKUP_FOLLOW); } -EXPORT_SYMBOL(stat); +EXPORT_SYMBOL(statat); -int lstat(const char *filename, struct stat *s) +int lstatat(int dirfd, const char *filename, struct stat *s) { - return stat_filename(filename, s, 0); + return stat_filename(dirfd, filename, s, 0); } -EXPORT_SYMBOL(lstat); +EXPORT_SYMBOL(lstatat); static char *__dpath(struct dentry *dentry, struct dentry *root) { @@ -2981,6 +2999,8 @@ char *dpath(struct dentry *dentry, struct dentry *root) /** * canonicalize_path - resolve links in path + * + * @dirfd: directory file descriptor to look up relative to * @pathname: The input path * * This function resolves all links in @pathname and returns @@ -2988,13 +3008,13 @@ char *dpath(struct dentry *dentry, struct dentry *root) * * Return: Path with links resolved. Allocated, must be freed after use. */ -char *canonicalize_path(const char *pathname) +char *canonicalize_path(int dirfd, const char *pathname) { char *res = NULL; struct path path; int ret; - ret = filename_lookup(getname(pathname), LOOKUP_FOLLOW, &path); + ret = filename_lookup(dirfd, getname(pathname), LOOKUP_FOLLOW, &path); if (ret) goto out; @@ -3016,7 +3036,7 @@ int chdir(const char *pathname) struct path path; int ret; - ret = filename_lookup(getname(pathname), LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path); + ret = filename_lookup(AT_FDCWD, getname(pathname), LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path); if (ret) goto out; @@ -3135,7 +3155,7 @@ int mount(const char *device, const char *fsname, const char *pathname, struct path path = {}; if (d_root) { - ret = filename_lookup(getname(pathname), LOOKUP_FOLLOW, &path); + ret = filename_lookup(AT_FDCWD, getname(pathname), LOOKUP_FOLLOW, &path); if (ret) goto out; @@ -3242,7 +3262,7 @@ int umount(const char *pathname) struct path path = {}; int ret; - ret = filename_lookup(getname(pathname), LOOKUP_FOLLOW, &path); + ret = filename_lookup(AT_FDCWD, getname(pathname), LOOKUP_FOLLOW, &path); if (ret) return ret; @@ -3313,7 +3333,7 @@ void automount_remove(const char *pathname) struct path path; int ret; - ret = filename_lookup(getname(pathname), LOOKUP_FOLLOW, &path); + ret = filename_lookup(AT_FDCWD, getname(pathname), LOOKUP_FOLLOW, &path); if (ret) return; @@ -3329,7 +3349,7 @@ int automount_add(const char *pathname, const char *cmd) struct path path; int ret; - ret = filename_lookup(getname(pathname), LOOKUP_FOLLOW, &path); + ret = filename_lookup(AT_FDCWD, getname(pathname), LOOKUP_FOLLOW, &path); if (ret) return ret; @@ -3441,14 +3461,14 @@ static int do_lookup_dentry(int argc, char *argv[]) if (argc < 2) return COMMAND_ERROR_USAGE; - ret = filename_lookup(getname(argv[1]), 0, &path); + ret = filename_lookup(AT_FDCWD, getname(argv[1]), 0, &path); if (ret) { printf("Cannot lookup path \"%s\": %s\n", argv[1], strerror(-ret)); return 1; } - canon = canonicalize_path(argv[1]); + canon = canonicalize_path(AT_FDCWD, argv[1]); printf("path \"%s\":\n", argv[1]); printf("dentry: 0x%p\n", path.dentry); diff --git a/include/fcntl.h b/include/fcntl.h index 06289abc4376..a6ed50b92eaf 100644 --- a/include/fcntl.h +++ b/include/fcntl.h @@ -4,6 +4,13 @@ #include +#define AT_FDCWD -100 /* Special value used to indicate + openat should use the current + working directory. */ + +#define AT_REMOVEDIR 0x200 /* Remove directory instead of + unlinking file. */ + /* open/fcntl - O_SYNC is only implemented on blocks devices and on files located on an ext2 file system */ #define O_ACCMODE 00000003 @@ -28,7 +35,12 @@ #define O_RWSIZE_4 004000000 #define O_RWSIZE_8 010000000 -int open(const char *pathname, int flags, ...); +int openat(int dirfd, const char *pathname, int flags); + +static inline int open(const char *pathname, int flags, ...) +{ + return openat(AT_FDCWD, pathname, flags); +} static inline int creat(const char *pathname, mode_t mode) { diff --git a/include/fs.h b/include/fs.h index a61982e59ade..c4af8659b0d3 100644 --- a/include/fs.h +++ b/include/fs.h @@ -150,7 +150,7 @@ char *mkmodestr(unsigned long mode, char *str); void stat_print(const char *filename, const struct stat *st); void cdev_print(const struct cdev *cdev); -char *canonicalize_path(const char *pathname); +char *canonicalize_path(int dirfd, const char *pathname); char *get_mounted_path(const char *path); diff --git a/include/sys/stat.h b/include/sys/stat.h index 0dd43d1f02c8..7af49a1d3ccc 100644 --- a/include/sys/stat.h +++ b/include/sys/stat.h @@ -5,7 +5,13 @@ #include #include +#include -int mkdir (const char *pathname, mode_t mode); +int mkdirat(int dirfd, const char *pathname, mode_t mode); + +static inline int mkdir(const char *pathname, mode_t mode) +{ + return mkdirat(AT_FDCWD, pathname, mode); +} #endif /* __STAT_H */ diff --git a/include/unistd.h b/include/unistd.h index f7fe737d002b..b78acbfd737a 100644 --- a/include/unistd.h +++ b/include/unistd.h @@ -3,26 +3,51 @@ #define __UNISTD_H #include +#include struct stat; -int unlink(const char *pathname); +int unlinkat(int dirfd, const char *pathname, int flags); int close(int fd); -int lstat(const char *filename, struct stat *s); -int stat(const char *filename, struct stat *s); +int lstatat(int dirfd, const char *filename, struct stat *s); +int statat(int dirfd, const char *filename, struct stat *s); int fstat(int fd, struct stat *s); ssize_t read(int fd, void *buf, size_t count); ssize_t pread(int fd, void *buf, size_t count, loff_t offset); ssize_t write(int fd, const void *buf, size_t count); ssize_t pwrite(int fd, const void *buf, size_t count, loff_t offset); loff_t lseek(int fildes, loff_t offset, int whence); -int rmdir (const char *pathname); int symlink(const char *pathname, const char *newpath); -int readlink(const char *path, char *buf, size_t bufsiz); +int readlinkat(int dirfd, const char *path, char *buf, size_t bufsiz); int chdir(const char *pathname); char *pushd(const char *dir); int popd(char *dir); const char *getcwd(void); int ftruncate(int fd, loff_t length); +static inline int unlink(const char *pathname) +{ + return unlinkat(AT_FDCWD, pathname, 0); +} + +static inline int lstat(const char *filename, struct stat *s) +{ + return lstatat(AT_FDCWD, filename, s); +} + +static inline int stat(const char *filename, struct stat *s) +{ + return statat(AT_FDCWD, filename, s); +} + +static inline int rmdir(const char *pathname) +{ + return unlinkat(AT_FDCWD, pathname, AT_REMOVEDIR); +} + +static inline int readlink(const char *path, char *buf, size_t bufsiz) +{ + return readlinkat(AT_FDCWD, path, buf, bufsiz); +} + #endif /* __UNISTD_H */ -- 2.39.2