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Modify crypt lock handle internal structure.

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makes it ready for future lock handle type
This commit is contained in:
Ondrej Kozina
2019-03-18 15:45:37 +01:00
parent 73aa329d57
commit 6ba358533b
1 changed files with 18 additions and 13 deletions
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31
lib/utils_device_locking.c
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@@ -42,21 +42,26 @@
((buf1).st_ino == (buf2).st_ino && \ ((buf1).st_ino == (buf2).st_ino && \
(buf1).st_dev == (buf2).st_dev) (buf1).st_dev == (buf2).st_dev)
#ifndef __GNUC__
# define __typeof__ typeof
#endif
enum lock_type { enum lock_type {
DEV_LOCK_READ = 0, DEV_LOCK_READ = 0,
DEV_LOCK_WRITE DEV_LOCK_WRITE
}; };
enum lock_mode {
DEV_LOCK_FILE = 0,
DEV_LOCK_BDEV
};
struct crypt_lock_handle { struct crypt_lock_handle {
dev_t devno;
unsigned refcnt; unsigned refcnt;
int flock_fd; int flock_fd;
enum lock_type type; enum lock_type type;
__typeof__( ((struct stat*)0)->st_mode) mode; enum lock_mode mode;
union {
struct {
dev_t devno;
} bdev;
} u;
}; };
static int resource_by_devno(char *res, size_t res_size, dev_t devno, unsigned fullpath) static int resource_by_devno(char *res, size_t res_size, dev_t devno, unsigned fullpath)
@@ -150,7 +155,8 @@ static int acquire_lock_handle(struct crypt_device *cd, const char *device_path,
return fd; return fd;
h->flock_fd = fd; h->flock_fd = fd;
h->devno = st.st_rdev; h->u.bdev.devno = st.st_rdev;
h->mode = DEV_LOCK_BDEV;
} else if (S_ISREG(st.st_mode)) { } else if (S_ISREG(st.st_mode)) {
// FIXME: workaround for nfsv4 // FIXME: workaround for nfsv4
fd = open(device_path, O_RDWR | O_NONBLOCK | O_CLOEXEC); fd = open(device_path, O_RDWR | O_NONBLOCK | O_CLOEXEC);
@@ -160,14 +166,13 @@ static int acquire_lock_handle(struct crypt_device *cd, const char *device_path,
h->flock_fd = fd; h->flock_fd = fd;
close(dev_fd); close(dev_fd);
} }
h->mode = DEV_LOCK_FILE;
} else { } else {
/* Wrong device type */ /* Wrong device type */
close(dev_fd); close(dev_fd);
return -EINVAL; return -EINVAL;
} }
h->mode = st.st_mode;
return 0; return 0;
} }
@@ -176,9 +181,9 @@ static void release_lock_handle(struct crypt_device *cd, struct crypt_lock_handl
char res[PATH_MAX]; char res[PATH_MAX];
struct stat buf_a, buf_b; struct stat buf_a, buf_b;
if (S_ISBLK(h->mode) && /* was it block device */ if ((h->mode == DEV_LOCK_BDEV) && /* was it block device */
!flock(h->flock_fd, LOCK_EX | LOCK_NB) && /* lock to drop the file */ !flock(h->flock_fd, LOCK_EX | LOCK_NB) && /* lock to drop the file */
!resource_by_devno(res, sizeof(res), h->devno, 1) && /* acquire lock resource name */ !resource_by_devno(res, sizeof(res), h->u.bdev.devno, 1) && /* acquire lock resource name */
!fstat(h->flock_fd, &buf_a) && /* read inode id referred by fd */ !fstat(h->flock_fd, &buf_a) && /* read inode id referred by fd */
!stat(res, &buf_b) && /* does path file still exist? */ !stat(res, &buf_b) && /* does path file still exist? */
same_inode(buf_a, buf_b)) { /* is it same id as the one referenced by fd? */ same_inode(buf_a, buf_b)) { /* is it same id as the one referenced by fd? */
@@ -207,10 +212,10 @@ static int verify_lock_handle(const char *device_path, struct crypt_lock_handle
struct stat lck_st, res_st; struct stat lck_st, res_st;
/* we locked a regular file, check during device_open() instead. No reason to check now */ /* we locked a regular file, check during device_open() instead. No reason to check now */
if (S_ISREG(h->mode)) if (h->mode == DEV_LOCK_FILE)
return 0; return 0;
if (resource_by_devno(res, sizeof(res), h->devno, 1)) if (resource_by_devno(res, sizeof(res), h->u.bdev.devno, 1))
return -EINVAL; return -EINVAL;
if (fstat(h->flock_fd, &lck_st)) if (fstat(h->flock_fd, &lck_st))