diff options
Diffstat (limited to 'e2fsprogs/e2fs_lib.c')
| -rw-r--r-- | e2fsprogs/e2fs_lib.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/e2fsprogs/e2fs_lib.c b/e2fsprogs/e2fs_lib.c new file mode 100644 index 0000000..cdf9735 --- /dev/null +++ b/e2fsprogs/e2fs_lib.c @@ -0,0 +1,197 @@ +/* vi: set sw=4 ts=4: */ +/* + * See README for additional information + * + * This file can be redistributed under the terms of the GNU Library General + * Public License + */ + +#include "libbb.h" +#include "e2fs_lib.h" + +#define HAVE_EXT2_IOCTLS 1 + +#if INT_MAX == LONG_MAX +#define IF_LONG_IS_SAME(x) x +#define IF_LONG_IS_WIDER(x) +#else +#define IF_LONG_IS_SAME(x) +#define IF_LONG_IS_WIDER(x) x +#endif + +static void close_silently(int fd) +{ + int e = errno; + close(fd); + errno = e; +} + + +/* Iterate a function on each entry of a directory */ +int iterate_on_dir(const char *dir_name, + int (*func)(const char *, struct dirent *, void *), + void * private) +{ + DIR *dir; + struct dirent *de, *dep; + int max_len, len; + + max_len = PATH_MAX + sizeof(struct dirent); + de = xmalloc(max_len+1); + memset(de, 0, max_len+1); + + dir = opendir(dir_name); + if (dir == NULL) { + free(de); + return -1; + } + while ((dep = readdir(dir))) { + len = sizeof(struct dirent); + if (len < dep->d_reclen) + len = dep->d_reclen; + if (len > max_len) + len = max_len; + memcpy(de, dep, len); + func(dir_name, de, private); + } + closedir(dir); + free(de); + return 0; +} + + +/* Get/set a file version on an ext2 file system */ +int fgetsetversion(const char *name, unsigned long *get_version, unsigned long set_version) +{ +#if HAVE_EXT2_IOCTLS + int fd, r; + IF_LONG_IS_WIDER(int ver;) + + fd = open(name, O_NONBLOCK); + if (fd == -1) + return -1; + if (!get_version) { + IF_LONG_IS_WIDER( + ver = (int) set_version; + r = ioctl(fd, EXT2_IOC_SETVERSION, &ver); + ) + IF_LONG_IS_SAME( + r = ioctl(fd, EXT2_IOC_SETVERSION, (void*)&set_version); + ) + } else { + IF_LONG_IS_WIDER( + r = ioctl(fd, EXT2_IOC_GETVERSION, &ver); + *get_version = ver; + ) + IF_LONG_IS_SAME( + r = ioctl(fd, EXT2_IOC_GETVERSION, (void*)get_version); + ) + } + close_silently(fd); + return r; +#else /* ! HAVE_EXT2_IOCTLS */ + errno = EOPNOTSUPP; + return -1; +#endif /* ! HAVE_EXT2_IOCTLS */ +} + + +/* Get/set a file flags on an ext2 file system */ +int fgetsetflags(const char *name, unsigned long *get_flags, unsigned long set_flags) +{ +#if HAVE_EXT2_IOCTLS + struct stat buf; + int fd, r; + IF_LONG_IS_WIDER(int f;) + + if (stat(name, &buf) == 0 /* stat is ok */ + && !S_ISREG(buf.st_mode) && !S_ISDIR(buf.st_mode) + ) { + goto notsupp; + } + fd = open(name, O_NONBLOCK); /* neither read nor write asked for */ + if (fd == -1) + return -1; + + if (!get_flags) { + IF_LONG_IS_WIDER( + f = (int) set_flags; + r = ioctl(fd, EXT2_IOC_SETFLAGS, &f); + ) + IF_LONG_IS_SAME( + r = ioctl(fd, EXT2_IOC_SETFLAGS, (void*)&set_flags); + ) + } else { + IF_LONG_IS_WIDER( + r = ioctl(fd, EXT2_IOC_GETFLAGS, &f); + *get_flags = f; + ) + IF_LONG_IS_SAME( + r = ioctl(fd, EXT2_IOC_GETFLAGS, (void*)get_flags); + ) + } + + close_silently(fd); + return r; + notsupp: +#endif /* HAVE_EXT2_IOCTLS */ + errno = EOPNOTSUPP; + return -1; +} + + +/* Print file attributes on an ext2 file system */ +struct flags_name { + unsigned long flag; + const char *short_name; + const char *long_name; +}; + +static const struct flags_name flags_array[] = { + { EXT2_SECRM_FL, "s", "Secure_Deletion" }, + { EXT2_UNRM_FL, "u" , "Undelete" }, + { EXT2_SYNC_FL, "S", "Synchronous_Updates" }, + { EXT2_DIRSYNC_FL, "D", "Synchronous_Directory_Updates" }, + { EXT2_IMMUTABLE_FL, "i", "Immutable" }, + { EXT2_APPEND_FL, "a", "Append_Only" }, + { EXT2_NODUMP_FL, "d", "No_Dump" }, + { EXT2_NOATIME_FL, "A", "No_Atime" }, + { EXT2_COMPR_FL, "c", "Compression_Requested" }, +#ifdef ENABLE_COMPRESSION + { EXT2_COMPRBLK_FL, "B", "Compressed_File" }, + { EXT2_DIRTY_FL, "Z", "Compressed_Dirty_File" }, + { EXT2_NOCOMPR_FL, "X", "Compression_Raw_Access" }, + { EXT2_ECOMPR_FL, "E", "Compression_Error" }, +#endif + { EXT3_JOURNAL_DATA_FL, "j", "Journaled_Data" }, + { EXT2_INDEX_FL, "I", "Indexed_direcctory" }, + { EXT2_NOTAIL_FL, "t", "No_Tailmerging" }, + { EXT2_TOPDIR_FL, "T", "Top_of_Directory_Hierarchies" }, + { 0, NULL, NULL } +}; + +void print_flags(FILE *f, unsigned long flags, unsigned options) +{ + const struct flags_name *fp; + + if (options & PFOPT_LONG) { + int first = 1; + for (fp = flags_array; fp->flag != 0; fp++) { + if (flags & fp->flag) { + if (!first) + fputs(", ", f); + fputs(fp->long_name, f); + first = 0; + } + } + if (first) + fputs("---", f); + } else { + for (fp = flags_array; fp->flag != 0; fp++) { + const char *p = "-"; + if (flags & fp->flag) + p = fp->short_name; + fputs(p, f); + } + } +} |