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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-12-11 12:09:03 +0000 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2015-12-16 09:28:23 -0500 |
| commit | dd39a26538e37f6c6131e829a4a510787e43c783 (patch) | |
| tree | 9803a42e2db54046bf428f6aff607b6256f53f51 /scripts | |
| parent | 9f9499ae8e6415cefc4fe0a96ad0e27864353c89 (diff) | |
| download | lwn-dd39a26538e37f6c6131e829a4a510787e43c783.tar.gz lwn-dd39a26538e37f6c6131e829a4a510787e43c783.zip | |
scripts: recordmcount: break hardlinks
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
Cc: stable@vger.kernel.org # 2.6.37+
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Steven Rostedt <rostedt@goodmis.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 698768bdc581..91705ef30402 100644 --- a/scripts/recordmcount.c +++ b/scripts/recordmcount.c @@ -211,6 +211,20 @@ 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; } |