diff options
| author | Matthias Koenig | 2007-07-18 16:15:46 +0200 |
|---|---|---|
| committer | Karel Zak | 2007-07-27 13:39:29 +0200 |
| commit | 2018629905d3d881ff3fddf76552b6e79091f2b8 (patch) | |
| tree | f51632da5d7c7a47a83ec77f94174dd265ecd7ed /disk-utils/mkswap.c | |
| parent | remove hardcoded package name from some utils (diff) | |
| download | kernel-qcow2-util-linux-2018629905d3d881ff3fddf76552b6e79091f2b8.tar.gz kernel-qcow2-util-linux-2018629905d3d881ff3fddf76552b6e79091f2b8.tar.xz kernel-qcow2-util-linux-2018629905d3d881ff3fddf76552b6e79091f2b8.zip | |
disk-utils: let mkfs tools open with O_EXCL
Let mkswap, mkfs.bfs, mkfs.minix open with O_EXCL if
used on block devices to prevent writing to the device
even if they are busy (mounted).
Unfortunately, O_EXCL has zero effect for 2.4 kernels where
in-kernel code doesn't use O_EXCL-like access locks. (Tested
on RHEL3.)
Signed-off-by: Matthias Koenig <mkoenig@suse.de>
Signed-off-by: Karel Zak <kzak@redhat.com>
Diffstat (limited to 'disk-utils/mkswap.c')
| -rw-r--r-- | disk-utils/mkswap.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/disk-utils/mkswap.c b/disk-utils/mkswap.c index 1fd1f185b..6af1ff7bb 100644 --- a/disk-utils/mkswap.c +++ b/disk-utils/mkswap.c @@ -640,8 +640,16 @@ main(int argc, char ** argv) { usage(); } - DEV = open(device_name,O_RDWR); - if (DEV < 0 || fstat(DEV, &statbuf) < 0) { + if (stat(device_name, &statbuf) < 0) { + perror(device_name); + exit(EXIT_FAILURE); + } + if (S_ISBLK(statbuf.st_mode)) + DEV = open(device_name, O_RDWR | O_EXCL); + else + DEV = open(device_name, O_RDWR); + + if (DEV < 0) { perror(device_name); exit(1); } |