diff options
| -rw-r--r-- | sys/kern/uipc_shm.c | 23 | ||||
| -rw-r--r-- | sys/sys/mman.h | 1 |
2 files changed, 21 insertions, 3 deletions
diff --git a/sys/kern/uipc_shm.c b/sys/kern/uipc_shm.c index b8eb96c..6f9fc81 100644 --- a/sys/kern/uipc_shm.c +++ b/sys/kern/uipc_shm.c @@ -49,6 +49,7 @@ __FBSDID("$FreeBSD$"); #include <sys/param.h> #include <sys/capability.h> +#include <sys/conf.h> #include <sys/fcntl.h> #include <sys/file.h> #include <sys/filedesc.h> @@ -101,12 +102,14 @@ static LIST_HEAD(, shm_mapping) *shm_dictionary; static struct sx shm_dict_lock; static struct mtx shm_timestamp_lock; static u_long shm_hash; +static struct unrhdr *shm_ino_unr; +static dev_t shm_dev_ino; #define SHM_HASH(fnv) (&shm_dictionary[(fnv) & shm_hash]) static int shm_access(struct shmfd *shmfd, struct ucred *ucred, int flags); static struct shmfd *shm_alloc(struct ucred *ucred, mode_t mode); -static void shm_dict_init(void *arg); +static void shm_init(void *arg); static void shm_drop(struct shmfd *shmfd); static struct shmfd *shm_hold(struct shmfd *shmfd); static void shm_insert(char *path, Fnv32_t fnv, struct shmfd *shmfd); @@ -408,6 +411,8 @@ shm_stat(struct file *fp, struct stat *sb, struct ucred *active_cred, sb->st_uid = shmfd->shm_uid; sb->st_gid = shmfd->shm_gid; mtx_unlock(&shm_timestamp_lock); + sb->st_dev = shm_dev_ino; + sb->st_ino = shmfd->shm_ino; return (0); } @@ -539,6 +544,7 @@ static struct shmfd * shm_alloc(struct ucred *ucred, mode_t mode) { struct shmfd *shmfd; + int ino; shmfd = malloc(sizeof(*shmfd), M_SHMFD, M_WAITOK | M_ZERO); shmfd->shm_size = 0; @@ -555,6 +561,11 @@ shm_alloc(struct ucred *ucred, mode_t mode) vfs_timestamp(&shmfd->shm_birthtime); shmfd->shm_atime = shmfd->shm_mtime = shmfd->shm_ctime = shmfd->shm_birthtime; + ino = alloc_unr(shm_ino_unr); + if (ino == -1) + shmfd->shm_ino = 0; + else + shmfd->shm_ino = ino; refcount_init(&shmfd->shm_refs, 1); mtx_init(&shmfd->shm_mtx, "shmrl", NULL, MTX_DEF); rangelock_init(&shmfd->shm_rl); @@ -585,6 +596,8 @@ shm_drop(struct shmfd *shmfd) rangelock_destroy(&shmfd->shm_rl); mtx_destroy(&shmfd->shm_mtx); vm_object_deallocate(shmfd->shm_object); + if (shmfd->shm_ino != 0) + free_unr(shm_ino_unr, shmfd->shm_ino); free(shmfd, M_SHMFD); } } @@ -617,14 +630,18 @@ shm_access(struct shmfd *shmfd, struct ucred *ucred, int flags) * the mappings in a hash table. */ static void -shm_dict_init(void *arg) +shm_init(void *arg) { mtx_init(&shm_timestamp_lock, "shm timestamps", NULL, MTX_DEF); sx_init(&shm_dict_lock, "shm dictionary"); shm_dictionary = hashinit(1024, M_SHMFD, &shm_hash); + shm_ino_unr = new_unrhdr(1, INT32_MAX, NULL); + KASSERT(shm_ino_unr != NULL, ("shm fake inodes not initialized")); + shm_dev_ino = devfs_alloc_cdp_inode(); + KASSERT(shm_dev_ino > 0, ("shm dev inode not initialized")); } -SYSINIT(shm_dict_init, SI_SUB_SYSV_SHM, SI_ORDER_ANY, shm_dict_init, NULL); +SYSINIT(shm_init, SI_SUB_SYSV_SHM, SI_ORDER_ANY, shm_init, NULL); static struct shmfd * shm_lookup(char *path, Fnv32_t fnv) diff --git a/sys/sys/mman.h b/sys/sys/mman.h index e89bee3..a13e3d1 100644 --- a/sys/sys/mman.h +++ b/sys/sys/mman.h @@ -219,6 +219,7 @@ struct shmfd { struct timespec shm_mtime; struct timespec shm_ctime; struct timespec shm_birthtime; + ino_t shm_ino; struct label *shm_label; /* MAC label */ const char *shm_path; |
