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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-12-11 12:09:03 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-03-03 15:06:50 -0800 |
| commit | b11202ea8547258205ef1ea15c61c7dd50d65989 (patch) | |
| tree | a31d305812db2a7eed2b5e5e075a2281b1b7da85 /scripts | |
| parent | c1a968eced547b68eb6a584b4808fb5990c7eaa7 (diff) | |
| download | lwn-b11202ea8547258205ef1ea15c61c7dd50d65989.tar.gz lwn-b11202ea8547258205ef1ea15c61c7dd50d65989.zip | |
scripts: recordmcount: break hardlinks
commit dd39a26538e37f6c6131e829a4a510787e43c783 upstream.
recordmcount edits the file in-place, which can cause problems when
using ccache in hardlink mode. Arrange for recordmcount to break a
hardlinked object.
Link: http://lkml.kernel.org/r/E1a7MVT-0000et-62@rmk-PC.arm.linux.org.uk
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'scripts')
| -rw-r--r-- | scripts/recordmcount.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/scripts/recordmcount.c b/scripts/recordmcount.c index 9c22317778eb..ee625e3a56ba 100644 --- a/scripts/recordmcount.c +++ b/scripts/recordmcount.c @@ -189,6 +189,20 @@ static void *mmap_file(char const *fname) addr = umalloc(sb.st_size); uread(fd_map, addr, sb.st_size); } + if (sb.st_nlink != 1) { + /* file is hard-linked, break the hard link */ + close(fd_map); + if (unlink(fname) < 0) { + perror(fname); + fail_file(); + } + fd_map = open(fname, O_RDWR | O_CREAT, sb.st_mode); + if (fd_map < 0) { + perror(fname); + fail_file(); + } + uwrite(fd_map, addr, sb.st_size); + } return addr; } |