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loop-util: store device major/minor in LoopDevice object

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Let's store this away. It's useful when matching up mounts (i.e.  struct
stat's .st_dev field) with loopback devices.
This commit is contained in:
Lennart Poettering 2021-03-22 21:22:22 +01:00
parent d83d804863
commit f3859d5f55
2 changed files with 7 additions and 0 deletions
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6
src/shared/loop-util.c
View File

@ -353,6 +353,7 @@ int loop_device_make(
.nr = nr,
.node = TAKE_PTR(loopdev),
.relinquished = true, /* It's not allocated by us, don't destroy it when this object is freed */
.devno = st.st_rdev,
};
*ret = d;
@ -425,6 +426,10 @@ int loop_device_make(
UINT64_C(240) * USEC_PER_MSEC * n_attempts/64));
}
if (fstat(loop_with_fd, &st) < 0)
return -errno;
assert(S_ISBLK(st.st_mode));
d = new(LoopDevice, 1);
if (!d)
return -ENOMEM;
@ -432,6 +437,7 @@ int loop_device_make(
.fd = TAKE_FD(loop_with_fd),
.node = TAKE_PTR(loopdev),
.nr = nr,
.devno = st.st_rdev,
};
*ret = d;

1
src/shared/loop-util.h
View File

@ -10,6 +10,7 @@ typedef struct LoopDevice LoopDevice;
struct LoopDevice {
int fd;
int nr;
dev_t devno;
char *node;
bool relinquished;
};