#include <linux/capability.h>
#include <linux/ptrace.h>
#include <linux/seq_file.h>
-#include <linux/mutex.h>
+#include <linux/rwsem.h>
#include <linux/nsproxy.h>
#include <linux/mount.h>
+#include <linux/ipc_namespace.h>
#include <asm/uaccess.h>
#define shm_file_data(file) (*((struct shm_file_data **)&(file)->private_data))
static const struct file_operations shm_file_operations;
-static struct vm_operations_struct shm_vm_ops;
+static const struct vm_operations_struct shm_vm_ops;
-static struct ipc_ids init_shm_ids;
-
-#define shm_ids(ns) (*((ns)->ids[IPC_SHM_IDS]))
+#define shm_ids(ns) ((ns)->ids[IPC_SHM_IDS])
#define shm_unlock(shp) \
ipc_unlock(&(shp)->shm_perm)
-#define shm_buildid(ns, id, seq) \
- ipc_buildid(&shm_ids(ns), id, seq)
static int newseg(struct ipc_namespace *, struct ipc_params *);
static void shm_open(struct vm_area_struct *vma);
static int sysvipc_shm_proc_show(struct seq_file *s, void *it);
#endif
-static void __shm_init_ns(struct ipc_namespace *ns, struct ipc_ids *ids)
+void shm_init_ns(struct ipc_namespace *ns)
{
- ns->ids[IPC_SHM_IDS] = ids;
ns->shm_ctlmax = SHMMAX;
ns->shm_ctlall = SHMALL;
ns->shm_ctlmni = SHMMNI;
ns->shm_tot = 0;
- ipc_init_ids(ids);
+ ipc_init_ids(&shm_ids(ns));
}
-static void do_shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *shp)
+/*
+ * Called with shm_ids.rw_mutex (writer) and the shp structure locked.
+ * Only shm_ids.rw_mutex remains locked on exit.
+ */
+static void do_shm_rmid(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp)
{
+ struct shmid_kernel *shp;
+ shp = container_of(ipcp, struct shmid_kernel, shm_perm);
+
if (shp->shm_nattch){
shp->shm_perm.mode |= SHM_DEST;
/* Do not find it any more */
shm_destroy(ns, shp);
}
-int shm_init_ns(struct ipc_namespace *ns)
-{
- struct ipc_ids *ids;
-
- ids = kmalloc(sizeof(struct ipc_ids), GFP_KERNEL);
- if (ids == NULL)
- return -ENOMEM;
-
- __shm_init_ns(ns, ids);
- return 0;
-}
-
+#ifdef CONFIG_IPC_NS
void shm_exit_ns(struct ipc_namespace *ns)
{
- struct shmid_kernel *shp;
- int next_id;
- int total, in_use;
-
- mutex_lock(&shm_ids(ns).mutex);
-
- in_use = shm_ids(ns).in_use;
-
- for (total = 0, next_id = 0; total < in_use; next_id++) {
- shp = idr_find(&shm_ids(ns).ipcs_idr, next_id);
- if (shp == NULL)
- continue;
- ipc_lock_by_ptr(&shp->shm_perm);
- do_shm_rmid(ns, shp);
- total++;
- }
- mutex_unlock(&shm_ids(ns).mutex);
-
- kfree(ns->ids[IPC_SHM_IDS]);
- ns->ids[IPC_SHM_IDS] = NULL;
+ free_ipcs(ns, &shm_ids(ns), do_shm_rmid);
+ idr_destroy(&ns->ids[IPC_SHM_IDS].ipcs_idr);
}
+#endif
void __init shm_init (void)
{
- __shm_init_ns(&init_ipc_ns, &init_shm_ids);
+ shm_init_ns(&init_ipc_ns);
ipc_init_proc_interface("sysvipc/shm",
" key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime\n",
IPC_SHM_IDS, sysvipc_shm_proc_show);
}
+/*
+ * shm_lock_(check_) routines are called in the paths where the rw_mutex
+ * is not necessarily held.
+ */
static inline struct shmid_kernel *shm_lock(struct ipc_namespace *ns, int id)
{
- return (struct shmid_kernel *) ipc_lock(&shm_ids(ns), id);
+ struct kern_ipc_perm *ipcp = ipc_lock(&shm_ids(ns), id);
+
+ if (IS_ERR(ipcp))
+ return (struct shmid_kernel *)ipcp;
+
+ return container_of(ipcp, struct shmid_kernel, shm_perm);
}
static inline struct shmid_kernel *shm_lock_check(struct ipc_namespace *ns,
int id)
{
- return (struct shmid_kernel *) ipc_lock_check(&shm_ids(ns), id);
+ struct kern_ipc_perm *ipcp = ipc_lock_check(&shm_ids(ns), id);
+
+ if (IS_ERR(ipcp))
+ return (struct shmid_kernel *)ipcp;
+
+ return container_of(ipcp, struct shmid_kernel, shm_perm);
}
static inline void shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *s)
ipc_rmid(&shm_ids(ns), &s->shm_perm);
}
-static inline int shm_addid(struct ipc_namespace *ns, struct shmid_kernel *shp)
-{
- return ipc_addid(&shm_ids(ns), &shp->shm_perm, ns->shm_ctlmni);
-}
-
-
/* This is called by fork, once for every shm attach. */
static void shm_open(struct vm_area_struct *vma)
/*
* shm_destroy - free the struct shmid_kernel
*
+ * @ns: namespace
* @shp: struct to free
*
- * It has to be called with shp and shm_ids.mutex locked,
+ * It has to be called with shp and shm_ids.rw_mutex (writer) locked,
* but returns with shp unlocked and freed.
*/
static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp)
shm_unlock(shp);
if (!is_file_hugepages(shp->shm_file))
shmem_lock(shp->shm_file, 0, shp->mlock_user);
- else
+ else if (shp->mlock_user)
user_shm_unlock(shp->shm_file->f_path.dentry->d_inode->i_size,
shp->mlock_user);
fput (shp->shm_file);
struct shmid_kernel *shp;
struct ipc_namespace *ns = sfd->ns;
- mutex_lock(&shm_ids(ns).mutex);
+ down_write(&shm_ids(ns).rw_mutex);
/* remove from the list of attaches of the shm segment */
shp = shm_lock(ns, sfd->id);
BUG_ON(IS_ERR(shp));
shm_destroy(ns, shp);
else
shm_unlock(shp);
- mutex_unlock(&shm_ids(ns).mutex);
+ up_write(&shm_ids(ns).rw_mutex);
}
static int shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
pol = sfd->vm_ops->get_policy(vma, addr);
else if (vma->vm_policy)
pol = vma->vm_policy;
- else
- pol = current->mempolicy;
+
return pol;
}
#endif
unsigned long flags)
{
struct shm_file_data *sfd = shm_file_data(file);
- return get_unmapped_area(sfd->file, addr, len, pgoff, flags);
-}
-
-int is_file_shm_hugepages(struct file *file)
-{
- int ret = 0;
-
- if (file->f_op == &shm_file_operations) {
- struct shm_file_data *sfd;
- sfd = shm_file_data(file);
- ret = is_file_hugepages(sfd->file);
- }
- return ret;
+ return sfd->file->f_op->get_unmapped_area(sfd->file, addr, len,
+ pgoff, flags);
}
static const struct file_operations shm_file_operations = {
.mmap = shm_mmap,
.fsync = shm_fsync,
.release = shm_release,
+#ifndef CONFIG_MMU
+ .get_unmapped_area = shm_get_unmapped_area,
+#endif
+};
+
+static const struct file_operations shm_file_operations_huge = {
+ .mmap = shm_mmap,
+ .fsync = shm_fsync,
+ .release = shm_release,
.get_unmapped_area = shm_get_unmapped_area,
};
-static struct vm_operations_struct shm_vm_ops = {
+int is_file_shm_hugepages(struct file *file)
+{
+ return file->f_op == &shm_file_operations_huge;
+}
+
+static const struct vm_operations_struct shm_vm_ops = {
.open = shm_open, /* callback for a new vm-area open */
.close = shm_close, /* callback for when the vm-area is released */
.fault = shm_fault,
#endif
};
+/**
+ * newseg - Create a new shared memory segment
+ * @ns: namespace
+ * @params: ptr to the structure that contains key, size and shmflg
+ *
+ * Called with shm_ids.rw_mutex held as a writer.
+ */
+
static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
{
key_t key = params->key;
struct file * file;
char name[13];
int id;
+ int acctflag = 0;
if (size < SHMMIN || size > ns->shm_ctlmax)
return -EINVAL;
sprintf (name, "SYSV%08x", key);
if (shmflg & SHM_HUGETLB) {
- /* hugetlb_file_setup takes care of mlock user accounting */
- file = hugetlb_file_setup(name, size);
- shp->mlock_user = current->user;
+ /* hugetlb_file_setup applies strict accounting */
+ if (shmflg & SHM_NORESERVE)
+ acctflag = VM_NORESERVE;
+ file = hugetlb_file_setup(name, size, acctflag,
+ &shp->mlock_user, HUGETLB_SHMFS_INODE);
} else {
- int acctflag = VM_ACCOUNT;
/*
* Do not allow no accounting for OVERCOMMIT_NEVER, even
* if it's asked for.
*/
if ((shmflg & SHM_NORESERVE) &&
sysctl_overcommit_memory != OVERCOMMIT_NEVER)
- acctflag = 0;
+ acctflag = VM_NORESERVE;
file = shmem_file_setup(name, size, acctflag);
}
error = PTR_ERR(file);
if (IS_ERR(file))
goto no_file;
- error = -ENOSPC;
- id = shm_addid(ns, shp);
- if(id == -1)
+ id = ipc_addid(&shm_ids(ns), &shp->shm_perm, ns->shm_ctlmni);
+ if (id < 0) {
+ error = id;
goto no_id;
+ }
shp->shm_cprid = task_tgid_vnr(current);
shp->shm_lprid = 0;
shp->shm_ctim = get_seconds();
shp->shm_segsz = size;
shp->shm_nattch = 0;
- shp->shm_perm.id = shm_buildid(ns, id, shp->shm_perm.seq);
shp->shm_file = file;
/*
* shmid gets reported as "inode#" in /proc/pid/maps.
return error;
no_id:
+ if (is_file_hugepages(file) && shp->mlock_user)
+ user_shm_unlock(size, shp->mlock_user);
fput(file);
no_file:
security_shm_free(shp);
return error;
}
-static inline int shm_security(void *shp, int shmflg)
+/*
+ * Called with shm_ids.rw_mutex and ipcp locked.
+ */
+static inline int shm_security(struct kern_ipc_perm *ipcp, int shmflg)
{
- return security_shm_associate((struct shmid_kernel *) shp, shmflg);
+ struct shmid_kernel *shp;
+
+ shp = container_of(ipcp, struct shmid_kernel, shm_perm);
+ return security_shm_associate(shp, shmflg);
}
-static inline int shm_more_checks(void *shp, struct ipc_params *params)
+/*
+ * Called with shm_ids.rw_mutex and ipcp locked.
+ */
+static inline int shm_more_checks(struct kern_ipc_perm *ipcp,
+ struct ipc_params *params)
{
- if (((struct shmid_kernel *)shp)->shm_segsz < params->u.size)
+ struct shmid_kernel *shp;
+
+ shp = container_of(ipcp, struct shmid_kernel, shm_perm);
+ if (shp->shm_segsz < params->u.size)
return -EINVAL;
return 0;
}
-asmlinkage long sys_shmget (key_t key, size_t size, int shmflg)
+SYSCALL_DEFINE3(shmget, key_t, key, size_t, size, int, shmflg)
{
struct ipc_namespace *ns;
struct ipc_ops shm_ops;
}
}
-struct shm_setbuf {
- uid_t uid;
- gid_t gid;
- mode_t mode;
-};
-
-static inline unsigned long copy_shmid_from_user(struct shm_setbuf *out, void __user *buf, int version)
+static inline unsigned long
+copy_shmid_from_user(struct shmid64_ds *out, void __user *buf, int version)
{
switch(version) {
case IPC_64:
- {
- struct shmid64_ds tbuf;
-
- if (copy_from_user(&tbuf, buf, sizeof(tbuf)))
+ if (copy_from_user(out, buf, sizeof(*out)))
return -EFAULT;
-
- out->uid = tbuf.shm_perm.uid;
- out->gid = tbuf.shm_perm.gid;
- out->mode = tbuf.shm_perm.mode;
-
return 0;
- }
case IPC_OLD:
{
struct shmid_ds tbuf_old;
if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old)))
return -EFAULT;
- out->uid = tbuf_old.shm_perm.uid;
- out->gid = tbuf_old.shm_perm.gid;
- out->mode = tbuf_old.shm_perm.mode;
+ out->shm_perm.uid = tbuf_old.shm_perm.uid;
+ out->shm_perm.gid = tbuf_old.shm_perm.gid;
+ out->shm_perm.mode = tbuf_old.shm_perm.mode;
return 0;
}
}
}
+/*
+ * Called with shm_ids.rw_mutex held as a reader
+ */
static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss,
unsigned long *swp)
{
in_use = shm_ids(ns).in_use;
for (total = 0, next_id = 0; total < in_use; next_id++) {
+ struct kern_ipc_perm *ipc;
struct shmid_kernel *shp;
struct inode *inode;
- /*
- * idr_find() is called via shm_get(), so with shm_ids.mutex
- * locked. Since ipc_addid() is also called with
- * shm_ids.mutex down, there is no need to add read barriers
- * here to gurantee the writes in ipc_addid() are seen in
- * order here (for Alpha).
- * However idr_find() itself does not necessary require
- * ipc_ids.mutex down. So if idr_find() is used by other
- * places without ipc_ids.mutex down, then it needs read
- * read memory barriers as ipc_lock() does.
- */
-
- shp = idr_find(&shm_ids(ns).ipcs_idr, next_id);
- if (shp == NULL)
+ ipc = idr_find(&shm_ids(ns).ipcs_idr, next_id);
+ if (ipc == NULL)
continue;
+ shp = container_of(ipc, struct shmid_kernel, shm_perm);
inode = shp->shm_file->f_path.dentry->d_inode;
if (is_file_hugepages(shp->shm_file)) {
struct address_space *mapping = inode->i_mapping;
- *rss += (HPAGE_SIZE/PAGE_SIZE)*mapping->nrpages;
+ struct hstate *h = hstate_file(shp->shm_file);
+ *rss += pages_per_huge_page(h) * mapping->nrpages;
} else {
+#ifdef CONFIG_SHMEM
struct shmem_inode_info *info = SHMEM_I(inode);
spin_lock(&info->lock);
*rss += inode->i_mapping->nrpages;
*swp += info->swapped;
spin_unlock(&info->lock);
+#else
+ *rss += inode->i_mapping->nrpages;
+#endif
}
total++;
}
}
-asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf)
+/*
+ * This function handles some shmctl commands which require the rw_mutex
+ * to be held in write mode.
+ * NOTE: no locks must be held, the rw_mutex is taken inside this function.
+ */
+static int shmctl_down(struct ipc_namespace *ns, int shmid, int cmd,
+ struct shmid_ds __user *buf, int version)
+{
+ struct kern_ipc_perm *ipcp;
+ struct shmid64_ds shmid64;
+ struct shmid_kernel *shp;
+ int err;
+
+ if (cmd == IPC_SET) {
+ if (copy_shmid_from_user(&shmid64, buf, version))
+ return -EFAULT;
+ }
+
+ ipcp = ipcctl_pre_down(&shm_ids(ns), shmid, cmd, &shmid64.shm_perm, 0);
+ if (IS_ERR(ipcp))
+ return PTR_ERR(ipcp);
+
+ shp = container_of(ipcp, struct shmid_kernel, shm_perm);
+
+ err = security_shm_shmctl(shp, cmd);
+ if (err)
+ goto out_unlock;
+ switch (cmd) {
+ case IPC_RMID:
+ do_shm_rmid(ns, ipcp);
+ goto out_up;
+ case IPC_SET:
+ ipc_update_perm(&shmid64.shm_perm, ipcp);
+ shp->shm_ctim = get_seconds();
+ break;
+ default:
+ err = -EINVAL;
+ }
+out_unlock:
+ shm_unlock(shp);
+out_up:
+ up_write(&shm_ids(ns).rw_mutex);
+ return err;
+}
+
+SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf)
{
- struct shm_setbuf setbuf;
struct shmid_kernel *shp;
int err, version;
struct ipc_namespace *ns;
if (err)
return err;
- memset(&shminfo,0,sizeof(shminfo));
+ memset(&shminfo, 0, sizeof(shminfo));
shminfo.shmmni = shminfo.shmseg = ns->shm_ctlmni;
shminfo.shmmax = ns->shm_ctlmax;
shminfo.shmall = ns->shm_ctlall;
shminfo.shmmin = SHMMIN;
if(copy_shminfo_to_user (buf, &shminfo, version))
return -EFAULT;
- /* reading a integer is always atomic */
+
+ down_read(&shm_ids(ns).rw_mutex);
err = ipc_get_maxid(&shm_ids(ns));
+ up_read(&shm_ids(ns).rw_mutex);
+
if(err<0)
err = 0;
goto out;
if (err)
return err;
- memset(&shm_info,0,sizeof(shm_info));
- mutex_lock(&shm_ids(ns).mutex);
+ memset(&shm_info, 0, sizeof(shm_info));
+ down_read(&shm_ids(ns).rw_mutex);
shm_info.used_ids = shm_ids(ns).in_use;
shm_get_stat (ns, &shm_info.shm_rss, &shm_info.shm_swp);
shm_info.shm_tot = ns->shm_tot;
shm_info.swap_attempts = 0;
shm_info.swap_successes = 0;
err = ipc_get_maxid(&shm_ids(ns));
- mutex_unlock(&shm_ids(ns).mutex);
- if(copy_to_user (buf, &shm_info, sizeof(shm_info))) {
+ up_read(&shm_ids(ns).rw_mutex);
+ if (copy_to_user(buf, &shm_info, sizeof(shm_info))) {
err = -EFAULT;
goto out;
}
struct shmid64_ds tbuf;
int result;
- if (!buf) {
- err = -EFAULT;
- goto out;
- }
-
if (cmd == SHM_STAT) {
shp = shm_lock(ns, shmid);
if (IS_ERR(shp)) {
}
result = 0;
}
- err=-EACCES;
+ err = -EACCES;
if (ipcperms (&shp->shm_perm, S_IRUGO))
goto out_unlock;
err = security_shm_shmctl(shp, cmd);
case SHM_LOCK:
case SHM_UNLOCK:
{
+ struct file *uninitialized_var(shm_file);
+
+ lru_add_drain_all(); /* drain pagevecs to lru lists */
+
shp = shm_lock_check(ns, shmid);
if (IS_ERR(shp)) {
err = PTR_ERR(shp);
goto out;
}
- err = audit_ipc_obj(&(shp->shm_perm));
- if (err)
- goto out_unlock;
+ audit_ipc_obj(&(shp->shm_perm));
if (!capable(CAP_IPC_LOCK)) {
+ uid_t euid = current_euid();
err = -EPERM;
- if (current->euid != shp->shm_perm.uid &&
- current->euid != shp->shm_perm.cuid)
+ if (euid != shp->shm_perm.uid &&
+ euid != shp->shm_perm.cuid)
goto out_unlock;
- if (cmd == SHM_LOCK &&
- !current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur)
+ if (cmd == SHM_LOCK && !rlimit(RLIMIT_MEMLOCK))
goto out_unlock;
}
goto out_unlock;
if(cmd==SHM_LOCK) {
- struct user_struct * user = current->user;
+ struct user_struct *user = current_user();
if (!is_file_hugepages(shp->shm_file)) {
err = shmem_lock(shp->shm_file, 1, user);
if (!err && !(shp->shm_perm.mode & SHM_LOCKED)){
goto out;
}
case IPC_RMID:
- {
- /*
- * We cannot simply remove the file. The SVID states
- * that the block remains until the last person
- * detaches from it, then is deleted. A shmat() on
- * an RMID segment is legal in older Linux and if
- * we change it apps break...
- *
- * Instead we set a destroyed flag, and then blow
- * the name away when the usage hits zero.
- */
- mutex_lock(&shm_ids(ns).mutex);
- shp = shm_lock_check(ns, shmid);
- if (IS_ERR(shp)) {
- err = PTR_ERR(shp);
- goto out_up;
- }
-
- err = audit_ipc_obj(&(shp->shm_perm));
- if (err)
- goto out_unlock_up;
-
- if (current->euid != shp->shm_perm.uid &&
- current->euid != shp->shm_perm.cuid &&
- !capable(CAP_SYS_ADMIN)) {
- err=-EPERM;
- goto out_unlock_up;
- }
-
- err = security_shm_shmctl(shp, cmd);
- if (err)
- goto out_unlock_up;
-
- do_shm_rmid(ns, shp);
- mutex_unlock(&shm_ids(ns).mutex);
- goto out;
- }
-
case IPC_SET:
- {
- if (!buf) {
- err = -EFAULT;
- goto out;
- }
-
- if (copy_shmid_from_user (&setbuf, buf, version)) {
- err = -EFAULT;
- goto out;
- }
- mutex_lock(&shm_ids(ns).mutex);
- shp = shm_lock_check(ns, shmid);
- if (IS_ERR(shp)) {
- err = PTR_ERR(shp);
- goto out_up;
- }
- err = audit_ipc_obj(&(shp->shm_perm));
- if (err)
- goto out_unlock_up;
- err = audit_ipc_set_perm(0, setbuf.uid, setbuf.gid, setbuf.mode);
- if (err)
- goto out_unlock_up;
- err=-EPERM;
- if (current->euid != shp->shm_perm.uid &&
- current->euid != shp->shm_perm.cuid &&
- !capable(CAP_SYS_ADMIN)) {
- goto out_unlock_up;
- }
-
- err = security_shm_shmctl(shp, cmd);
- if (err)
- goto out_unlock_up;
-
- shp->shm_perm.uid = setbuf.uid;
- shp->shm_perm.gid = setbuf.gid;
- shp->shm_perm.mode = (shp->shm_perm.mode & ~S_IRWXUGO)
- | (setbuf.mode & S_IRWXUGO);
- shp->shm_ctim = get_seconds();
- break;
- }
-
+ err = shmctl_down(ns, shmid, cmd, buf, version);
+ return err;
default:
- err = -EINVAL;
- goto out;
+ return -EINVAL;
}
- err = 0;
-out_unlock_up:
- shm_unlock(shp);
-out_up:
- mutex_unlock(&shm_ids(ns).mutex);
- goto out;
out_unlock:
shm_unlock(shp);
out:
struct ipc_namespace *ns;
struct shm_file_data *sfd;
struct path path;
- mode_t f_mode;
+ fmode_t f_mode;
err = -EINVAL;
if (shmid < 0)
if (err)
goto out_unlock;
- path.dentry = dget(shp->shm_file->f_path.dentry);
- path.mnt = shp->shm_file->f_path.mnt;
+ path = shp->shm_file->f_path;
+ path_get(&path);
shp->shm_nattch++;
size = i_size_read(path.dentry->d_inode);
shm_unlock(shp);
if (!sfd)
goto out_put_dentry;
- err = -ENOMEM;
-
- file = alloc_file(path.mnt, path.dentry, f_mode, &shm_file_operations);
+ file = alloc_file(&path, f_mode,
+ is_file_hugepages(shp->shm_file) ?
+ &shm_file_operations_huge :
+ &shm_file_operations);
if (!file)
goto out_free;
fput(file);
out_nattch:
- mutex_lock(&shm_ids(ns).mutex);
+ down_write(&shm_ids(ns).rw_mutex);
shp = shm_lock(ns, shmid);
BUG_ON(IS_ERR(shp));
shp->shm_nattch--;
shm_destroy(ns, shp);
else
shm_unlock(shp);
- mutex_unlock(&shm_ids(ns).mutex);
+ up_write(&shm_ids(ns).rw_mutex);
out:
return err;
out_free:
kfree(sfd);
out_put_dentry:
- dput(path.dentry);
+ path_put(&path);
goto out_nattch;
}
-asmlinkage long sys_shmat(int shmid, char __user *shmaddr, int shmflg)
+SYSCALL_DEFINE3(shmat, int, shmid, char __user *, shmaddr, int, shmflg)
{
unsigned long ret;
long err;
* detach and kill segment if marked destroyed.
* The work is done in shm_close.
*/
-asmlinkage long sys_shmdt(char __user *shmaddr)
+SYSCALL_DEFINE1(shmdt, char __user *, shmaddr)
{
struct mm_struct *mm = current->mm;
- struct vm_area_struct *vma, *next;
+ struct vm_area_struct *vma;
unsigned long addr = (unsigned long)shmaddr;
- loff_t size = 0;
int retval = -EINVAL;
+#ifdef CONFIG_MMU
+ loff_t size = 0;
+ struct vm_area_struct *next;
+#endif
if (addr & ~PAGE_MASK)
return retval;
*/
vma = find_vma(mm, addr);
+#ifdef CONFIG_MMU
while (vma) {
next = vma->vm_next;
vma = next;
}
+#else /* CONFIG_MMU */
+ /* under NOMMU conditions, the exact address to be destroyed must be
+ * given */
+ retval = -EINVAL;
+ if (vma->vm_start == addr && vma->vm_ops == &shm_vm_ops) {
+ do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start);
+ retval = 0;
+ }
+
+#endif
+
up_write(&mm->mmap_sem);
return retval;
}
static int sysvipc_shm_proc_show(struct seq_file *s, void *it)
{
struct shmid_kernel *shp = it;
- char *format;
-#define SMALL_STRING "%10d %10d %4o %10u %5u %5u %5d %5u %5u %5u %5u %10lu %10lu %10lu\n"
-#define BIG_STRING "%10d %10d %4o %21u %5u %5u %5d %5u %5u %5u %5u %10lu %10lu %10lu\n"
+#if BITS_PER_LONG <= 32
+#define SIZE_SPEC "%10lu"
+#else
+#define SIZE_SPEC "%21lu"
+#endif
- if (sizeof(size_t) <= sizeof(int))
- format = SMALL_STRING;
- else
- format = BIG_STRING;
- return seq_printf(s, format,
+ return seq_printf(s,
+ "%10d %10d %4o " SIZE_SPEC " %5u %5u "
+ "%5lu %5u %5u %5u %5u %10lu %10lu %10lu\n",
shp->shm_perm.key,
shp->shm_perm.id,
shp->shm_perm.mode,
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff