diff options
Diffstat (limited to 'src/utils/sys-utils/xlosetup.c')
| -rw-r--r-- | src/utils/sys-utils/xlosetup.c | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/src/utils/sys-utils/xlosetup.c b/src/utils/sys-utils/xlosetup.c index 768cee9..2511633 100644 --- a/src/utils/sys-utils/xlosetup.c +++ b/src/utils/sys-utils/xlosetup.c @@ -463,6 +463,29 @@ static void __attribute__((__noreturn__)) usage(void) exit(EXIT_SUCCESS); } +static void warn_size(const char *filename, uint64_t size, uint64_t offset, int flags) +{ + struct stat st; + + if (!size) { + if (stat(filename, &st) || S_ISBLK(st.st_mode)) + return; + size = st.st_size; + + if (flags & LOOPDEV_FL_OFFSET) + size -= offset; + } + + if (size < 512) + warnx(_("%s: Warning: file is smaller than 512 bytes; the xloop device " + "may be useless or invisible for system tools."), + filename); + else if (size % 512) + warnx(_("%s: Warning: file does not fit into a 512-byte sector; " + "the end of the file will be ignored."), + filename); +} + static int create_loop(struct loopdev_cxt *lc, int nooverlap, int lo_flags, int flags, const char *file, uint64_t offset, uint64_t sizelimit, @@ -572,7 +595,7 @@ static int create_loop(struct loopdev_cxt *lc, if (rc == 0) break; /* success */ - if (errno == EBUSY && !hasdev && ntries < 64) { + if ((errno == EBUSY || errno == EAGAIN) && !hasdev && ntries < 64) { xusleep(200000); ntries++; continue; @@ -857,6 +880,7 @@ int main(int argc, char **argv) if (res == 0) { if (showdev) printf("%s\n", loopcxt_get_device(&lc)); + warn_size(file, sizelimit, offset, flags); if (set_dio) goto lo_set_dio; } |