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infra: new helper mars_is_mountpoint()

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This commit is contained in:
Thomas Schoebel-Theuer 2020-07-31 08:07:08 +02:00
parent 7467aa9939
commit 6d9ffefb84
2 changed files with 39 additions and 0 deletions
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1
kernel/sy_old/strategy.h
View File

@ -225,6 +225,7 @@ bool push_link(const char *peer_name,
/* General fs wrappers (for abstraction)
*/
extern bool mars_is_mountpoint(const char *pathname);
extern int mars_stat(const char *path, struct kstat *stat, bool use_lstat);
extern void mars_sync(void);
extern int mars_mkdir(const char *path);

38
kernel/sy_old/sy_generic.c
View File

@ -533,6 +533,44 @@ int _length_paranoia(int len, int line)
return len;
}
bool mars_is_mountpoint(const char *pathname)
{
struct path path = {};
mm_segment_t oldfs;
int status;
bool res = false;
oldfs = get_fs();
set_fs(get_ds());
status = user_path_at(AT_FDCWD, pathname, 0, &path);
if (unlikely(status < 0)) {
MARS_WRN("pathname '%s' does not exist, status = %d\n",
pathname, status);
goto done_fs;
}
if (unlikely(!path.dentry)) {
MARS_WRN("path '%s' has invalid dentry\n", pathname);
goto done_put;
}
if (unlikely(!follow_up(&path))) {
MARS_WRN("path '%s' has no vfsmnt\n", pathname);
goto done_put;
}
/* the second one may fail when we already are at the root mount */
if (!follow_up(&path)) {
goto done_put;
}
res = d_mountpoint(path.dentry);
done_put:
path_put(&path);
done_fs:
set_fs(oldfs);
return res;
}
int mars_stat(const char *path, struct kstat *stat, bool use_lstat)
{
mm_segment_t oldfs;