https://bugzilla.samba.org/show_bug.cgi?id=4899
Summary: When a mounted dir cannot be visited, rsync will halt
there and the shell is halted, even "ctrl -c" can't quit
it.
Product: rsync
Version: 2.6.9
Platform: x86
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P3
Component: core
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
QAContact: [EMAIL PROTECTED]
Problem: When a mounted dir(for example, "mnt") cannot be visited, rsync will
halt there and the shell is halted, even "ctrl -c" can't quit it. If the mountd
dir is filtered out, rsync still fail to work.
dirA_________dir1
|__ mnt
dirB_________dir1
$rsync -r -vvvvvvv -L --include-from=filter --exclude="*" dirA/ dirB/
Root cause:
related brief process of rsync:
1 client_run(), called once the connection has been negotiated.
2 read the filter.
3 send_file_list().
4 send_files().
In step 3, rsync will examine the file one by one, to decide whether it is a
symblic, whether it is filtered, and so on. It revokes do_stat to check the
file status.
int do_stat(const char *fname, STRUCT_STAT *st)
{
#if HAVE_OFF64_T
return stat64(fname, st);
#else
return stat(fname, st);
#endif
}
It revokes system function "stat", which will halt when the mounted dir is
crashed.
The "stat" issue is not due to rsync. But if the mountd dir is filtered out,
rsync should work well.
Solution:
Modified "flist.c",
struct file_struct *make_file(char *fname, struct file_list *flist,
STRUCT_STAT *stp, unsigned short flags,
int filter_level)
{
...
memset(sum, 0, SUM_LENGTH);
/* In case a mounted dir crashed, than stat will hang there even
the dir has been filtered */
if (filter_level != NO_FILTERS
&& is_excluded(thisname, 1, filter_level)) {
rprintf(FINFO, "Excluding %s\n", thisname);
return NULL;
} else if (stp && S_ISDIR(stp->st_mode)) {
st = *stp; /* Needed for "symlink/." with --relative. */
*linkname = '\0'; /* make IBM code checker happy */
} else if (readlink_stat(thisname, &st, linkname) != 0) {
...
}
}
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