diff options
Diffstat (limited to 'src/bindfs.c')
| -rw-r--r-- | src/bindfs.c | 43 |
1 files changed, 41 insertions, 2 deletions
diff --git a/src/bindfs.c b/src/bindfs.c index cf681dd..f6bbbe4 100644 --- a/src/bindfs.c +++ b/src/bindfs.c @@ -72,6 +72,10 @@ #include <sys/xattr.h> #endif +#ifdef __LINUX__ +#include <linux/fs.h> // For BLKGETSIZE64 +#endif + #include <fuse.h> #include <fuse_opt.h> @@ -164,6 +168,8 @@ static struct Settings { int hide_hard_links; int resolve_symlinks; + int block_devices_as_files; + enum ResolvedSymlinkDeletion { RESOLVED_SYMLINK_DELETION_DENY, RESOLVED_SYMLINK_DELETION_SYMLINK_ONLY, @@ -365,8 +371,34 @@ static int getattr_common(const char *procpath, struct stat *stbuf) } /* Hide hard links */ - if (settings.hide_hard_links) + if (settings.hide_hard_links) { stbuf->st_nlink = 1; + } + + /* Block files as regular files. */ + if (settings.block_devices_as_files && S_ISBLK(stbuf->st_mode)) { + stbuf->st_mode ^= S_IFBLK | S_IFREG; // Flip both bits +#ifdef __LINUX__ + uint64_t size; + ioctl(file, BLKGETSIZE64, &size); + stbuf->st_size = (off_t)size; + if (stbuf->st_size < 0) { // Underflow + return -EOVERFLOW; + } +#else + int fd = open(procpath, O_RDONLY); + if (fd == -1) { + return -errno; + } + off_t size = lseek(fd, 0, SEEK_END); + if (size == (off_t)-1) { + close(fd); + return -errno; + } + stbuf->st_size = size; + close(fd); +#endif + } /* Then permission bits. Symlink permissions don't matter, though. */ if ((stbuf->st_mode & S_IFLNK) != S_IFLNK) { @@ -1436,6 +1468,7 @@ static void print_usage(const char *progname) " --hide-hard-links Always report a hard link count of 1.\n" " --resolve-symlinks Resolve symbolic links.\n" " --resolved-symlink-deletion=... Decide how to delete resolved symlinks.\n" + " --block-devices-as-files Show block devices as regular files.\n" " --multithreaded Enable multithreaded mode. See man page\n" " for security issue with current implementation.\n" "\n" @@ -1477,7 +1510,8 @@ enum OptionKey { OPTKEY_DISABLE_LOCK_FORWARDING, OPTKEY_ENABLE_IOCTL, OPTKEY_HIDE_HARD_LINKS, - OPTKEY_RESOLVE_SYMLINKS + OPTKEY_RESOLVE_SYMLINKS, + OPTKEY_BLOCK_DEVICES_AS_FILES }; static int process_option(void *data, const char *arg, int key, @@ -1570,6 +1604,9 @@ static int process_option(void *data, const char *arg, int key, case OPTKEY_RESOLVE_SYMLINKS: settings.resolve_symlinks = 1; return 0; + case OPTKEY_BLOCK_DEVICES_AS_FILES: + settings.block_devices_as_files = 1; + return 0; case OPTKEY_NONOPTION: if (!settings.mntsrc) { @@ -1901,6 +1938,7 @@ int main(int argc, char *argv[]) OPT2("--hide-hard-links", "hide-hard-links", OPTKEY_HIDE_HARD_LINKS), OPT2("--resolve-symlinks", "resolve-symlinks", OPTKEY_RESOLVE_SYMLINKS), OPT_OFFSET2("--resolved-symlink-deletion=%s", "resolved-symlink-deletion=%s", resolved_symlink_deletion, -1), + OPT2("--block-devices-as-files", "block-devices-as-files", OPTKEY_BLOCK_DEVICES_AS_FILES), OPT2("--realistic-permissions", "realistic-permissions", OPTKEY_REALISTIC_PERMISSIONS), OPT2("--ctime-from-mtime", "ctime-from-mtime", OPTKEY_CTIME_FROM_MTIME), @@ -1949,6 +1987,7 @@ int main(int argc, char *argv[]) settings.hide_hard_links = 0; settings.resolve_symlinks = 0; settings.resolved_symlink_deletion_policy = RESOLVED_SYMLINK_DELETION_SYMLINK_ONLY; + settings.block_devices_as_files = 0; settings.realistic_permissions = 0; settings.ctime_from_mtime = 0; settings.enable_lock_forwarding = 0; |