This saves from the blunder of formatting a live mounted filesystem.
This can be extended to get the mount flags of the filesystem
mounted.
Signed-off-by: Goldwyn Rodrigues <[EMAIL PROTECTED]>
---
mkfs.c | 8 +++++++-
utils.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
utils.h | 1 +
3 files changed, 60 insertions(+), 1 deletion(-)
diff -r 13295e4517d1 mkfs.c
--- a/mkfs.c Tue Mar 04 13:07:22 2008 -0500
+++ b/mkfs.c Thu Mar 20 12:15:27 2008 +0530
@@ -173,7 +173,7 @@ int main(int ac, char **av)
u64 block_count = 0;
int fd;
struct stat st;
- int ret;
+ int ret, mounted = 0;
int i;
u32 leafsize = 16 * 1024;
u32 sectorsize = 4096;
@@ -232,6 +232,12 @@ int main(int ac, char **av)
fprintf(stderr, "unable to stat %s\n", file);
exit(1);
}
+ if (check_mounted(file, &mounted)==0)
+ if (mounted) {
+ fprintf(stderr, "%s is mounted\n", file);
+ exit(1);
+ }
+
if (block_count == 0) {
block_count = device_size(fd, &st);
if (block_count == 0) {
diff -r 13295e4517d1 utils.c
--- a/utils.c Tue Mar 04 13:07:22 2008 -0500
+++ b/utils.c Thu Mar 20 12:15:27 2008 +0530
@@ -25,6 +25,7 @@
#include <uuid/uuid.h>
#include <fcntl.h>
#include <unistd.h>
+#include <mntent.h>
#include "kerncompat.h"
#include "radix-tree.h"
#include "ctree.h"
@@ -230,3 +231,54 @@ error:
error:
return ret;
}
+
+
+int check_mounted(char *file, int *flag)
+{
+ struct mntent *mnt;
+ struct stat st_buf;
+ dev_t file_dev=0, file_rdev=0;
+ ino_t file_ino=0;
+ FILE *f;
+
+ *flag = 0;
+ if ((f = setmntent ("/proc/mounts", "r")) == NULL)
+ return errno;
+
+ if (stat(file, &st_buf) < 0) {
+ return errno;
+ }
+ else {
+ if (S_ISBLK(st_buf.st_mode)) {
+ file_rdev = st_buf.st_rdev;
+ } else {
+ file_dev = st_buf.st_dev;
+ file_ino = st_buf.st_ino;
+ }
+ }
+
+
+ while ((mnt = getmntent (f)) != NULL) {
+ if (strcmp(file, mnt->mnt_fsname) == 0)
+ break;
+ if (stat(mnt->mnt_fsname, &st_buf) == 0) {
+ if (S_ISBLK(st_buf.st_mode)) {
+ if (file_rdev && (file_rdev == st_buf.st_rdev))
+ break;
+ } else {
+ if (file_dev && ((file_dev == st_buf.st_dev) &&
+ (file_ino ==
st_buf.st_ino)))
+ break;
+ }
+ }
+ }
+
+ if (mnt) {
+ /* found an entry in mnt table */
+ *flag = 1;
+ }
+
+ endmntent (f);
+ return 0;
+}
+
diff -r 13295e4517d1 utils.h
--- a/utils.h Tue Mar 04 13:07:22 2008 -0500
+++ b/utils.h Thu Mar 20 12:15:27 2008 +0530
@@ -22,4 +22,5 @@ int make_btrfs(int fd, u64 new_blocks[4]
u32 leafsize, u32 sectorsize, u32 stripesize);
int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 objectid);
+int check_mounted(char *devicename, int *mounted);
#endif
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