<commit_before>/*
 * linux/ipc/shm.c
 * Copyright (C) 1992, 1993 <NAME>
 *	 Many improvements/fixes by <NAME>.
 * Replaced `struct shm_desc' by `struct vm_area_struct', July 1994.
 * Fixed the shm swap deallocation (shm_unuse()), August 1998 <NAME>.
 *
 * /proc/sysvipc/shm support (c) 1999 <NAME> <<EMAIL>>
 * BIGMEM support, <NAME> <<EMAIL>>
 * SMP thread shm, <NAME> <<EMAIL>>
 * HIGHMEM support, <NAME> <<EMAIL>>
 * Make shmmax, shmall, shmmni sysctl'able, <NAME> <<EMAIL>>
 * Shared /dev/zero support, <NAME> <<EMAIL>>
 * Move the mm functionality over to mm/shmem.c, <NAME> <<EMAIL>>
 *
 * support for audit of ipc object properties and permission changes
 * <NAME> <<EMAIL>>
 *
 * namespaces support
 * OpenVZ, SWsoft Inc.
 * <NAME> <<EMAIL>>
 */

#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/hugetlb.h>
#include <linux/shm.h>
#include <linux/init.h>
#include <linux/file.h>
#include <linux/mman.h>
#include <linux/shmem_fs.h>
#include <linux/security.h>
#include <linux/syscalls.h>
#include <linux/audit.h>
#include <linux/capability.h>
#include <linux/ptrace.h>
#include <linux/seq_file.h>
#include <linux/mutex.h>
#include <linux/nsproxy.h>
#include <linux/mount.h>

#include <asm/uaccess.h>

#include "util.h"

struct shm_file_data {
	int id;
	struct ipc_namespace *ns;
	struct file *file;
	const struct vm_operations_struct *vm_ops;
};

#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 struct ipc_ids init_shm_ids;

#define shm_ids(ns)	(*((ns)->ids[IPC_SHM_IDS]))

#define shm_lock(ns, id)		\
	((struct shmid_kernel*)ipc_lock(&shm_ids(ns),id))
#define shm_unlock(shp)			\
	ipc_unlock(&(shp)->shm_perm)
#define shm_get(ns, id)			\
	((struct shmid_kernel*)ipc_get(&shm_ids(ns),id))
#define shm_buildid(ns, id, seq)	\
	ipc_buildid(&shm_ids(ns), id, seq)

static int newseg (struct ipc_namespace *ns, key_t key,
		int shmflg, size_t size);
static void shm_open(struct vm_area_struct *vma);
static void shm_close(struct vm_area_struct *vma);
static void shm_destroy (struct ipc_namespace *ns, struct shmid_kernel *shp);
#ifdef CONFIG_PROC_FS
static int sysvipc_shm_proc_show(struct seq_file *s, void *it);
#endif

static void __ipc_init __shm_init_ns(struct ipc_namespace *ns, struct ipc_ids *ids)
{
	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, 1);
}

static void do_shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *shp)
{
	if (shp->shm_nattch){
		shp->shm_perm.mode |= SHM_DEST;
		/* Do not find it any more */
		shp->shm_perm.key = IPC_PRIVATE;
		shm_unlock(shp);
	} else
		shm_destroy(ns, shp);
}

#ifdef CONFIG_IPC_NS
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;
}

void shm_exit_ns(struct ipc_namespace *ns)
{
	int i;
	struct shmid_kernel *shp;

	mutex_lock(&shm_ids(ns).mutex);
	for (i = 0; i <= shm_ids(ns).max_id; i++) {
		shp = shm_lock(ns, i);
		if (shp == NULL)
			continue;

		do_shm_rmid(ns, shp);
	}
	mutex_unlock(&shm_ids(ns).mutex);

	ipc_fini_ids(ns->ids[IPC_SHM_IDS]);
	kfree(ns->ids[IPC_SHM_IDS]);
	ns->ids[IPC_SHM_IDS] = NULL;
}
#endif

void __init shm_init (void)
{
	__shm_init_ns(&init_ipc_ns, &init_shm_ids);
	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);
}

static inline int shm_checkid(struct ipc_namespace *ns,
		struct shmid_kernel *s, int id)
{
	if (ipc_checkid(&shm_ids(ns), &s->shm_perm, id))
		return -EIDRM;
	return 0;
}

static inline struct shmid_kernel *shm_rmid(struct ipc_namespace *ns, int id)
{
	return (struct shmid_kernel *)ipc_rmid(&shm_ids(ns), id);
}

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)
{
	struct file *file = vma->vm_file;
	struct shm_file_data *sfd = shm_file_data(file);
	struct shmid_kernel *shp;

	shp = shm_lock(sfd->ns, sfd->id);
	BUG_ON(!shp);
	shp->shm_atim = get_seconds();
	shp->shm_lprid = current->tgid;
	shp->shm_nattch++;
	shm_unlock(shp);
}

/*
 * shm_destroy - free the struct shmid_kernel
 *
 * @shp: struct to free
 *
 * It has to be called with shp and shm_ids.mutex locked,
 * but returns with shp unlocked and freed.
 */
static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp)
{
	ns->shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT;
	shm_rmid(ns, shp->id);
	shm_unlock(shp);
	if (!is_file_hugepages(shp->shm_file))
		shmem_lock(shp->shm_file, 0, shp->mlock_user);
	else
		user_shm_unlock(shp->shm_file->f_path.dentry->d_inode->i_size,
						shp->mlock_user);
	fput (shp->shm_file);
	security_shm_free(shp);
	ipc_rcu_putref(shp);
}

/*
 * remove the attach descriptor vma.
 * free memory for segment if it is marked destroyed.
 * The descriptor has already been removed from the current->mm->mmap list
 * and will later be kfree()d.
 */
static void shm_close(struct vm_area_struct *vma)
{
	struct file * file = vma->vm_file;
	struct shm_file_data *sfd = shm_file_data(file);
	struct shmid_kernel *shp;
	struct ipc_namespace *ns = sfd->ns;

	mutex_lock(&shm_ids(ns).mutex);
	/* remove from the list of attaches of the shm segment */
	shp = shm_lock(ns, sfd->id);
	BUG_ON(!shp);
	shp->shm_lprid = current->tgid;
	shp->shm_dtim = get_seconds();
	shp->shm_nattch--;
	if(shp->shm_nattch == 0 &&
	   shp->shm_perm.mode & SHM_DEST)
		shm_destroy(ns, shp);
	else
		shm_unlock(shp);
	mutex_unlock(&shm_ids(ns).mutex);
}

static struct page *shm_nopage(struct vm_area_struct *vma,
			       unsigned long address, int *type)
{
	struct file *file = vma->vm_file;
	struct shm_file_data *sfd = shm_file_data(file);

	return sfd->vm_ops->nopage(vma, address, type);
}

#ifdef CONFIG_NUMA
int shm_set_policy(struct vm_area_struct *vma, struct mempolicy *new)
{
	struct file *file = vma->vm_file;
	struct shm_file_data *sfd = shm_file_data(file);
	int err = 0;
	if (sfd->vm_ops->set_policy)
		err = sfd->vm_ops->set_policy(vma, new);
	return err;
}

struct mempolicy *shm_get_policy(struct vm_area_struct *vma, unsigned long addr)
{
	struct file *file = vma->vm_file;
	struct shm_file_data *sfd = shm_file_data(file);
	struct mempolicy *pol = NULL;

	if (sfd->vm_ops->get_policy)
		pol = sfd->vm_ops->get_policy(vma, addr);
	else
		pol = vma->vm_policy;
	return pol;
}
#endif

static int shm_mmap(struct file * file, struct vm_area_struct * vma)
{
	struct shm_file_data *sfd = shm_file_data(file);
	int ret;

	ret = sfd->file->f_op->mmap(sfd->file, vma);
	if (ret != 0)
		return ret;
	sfd->vm_ops = vma->vm_ops;
	vma->vm_ops = &shm_vm_ops;
	shm_open(vma);

	return ret;
}

static int shm_release(struct inode *ino, struct file *file)
{
	struct shm_file_data *sfd = shm_file_data(file);

	put_ipc_ns(sfd->ns);
	shm_file_data(file) = NULL;
	kfree(sfd);
	return 0;
}

static int shm_fsync(struct file *file, struct dentry *dentry, int datasync)
{
	int (*fsync) (struct file *, struct dentry *, int datasync);
	struct shm_file_data *sfd = shm_file_data(file);
	int ret = -EINVAL;

	fsync = sfd->file->f_op->fsync;
	if (fsync)
		ret = fsync(sfd->file, sfd->file->f_path.dentry, datasync);
	return ret;
}

static unsigned long shm_get_unmapped_area(struct file *file,
	unsigned long addr, unsigned long len, unsigned long pgoff,
	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;
}

static const struct file_operations shm_file_operations = {
	.mmap		= shm_mmap,
	.fsync		= shm_fsync,
	.release	= shm_release,
	.get_unmapped_area	= shm_get_unmapped_area,
};

static 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 */
	.nopage	= shm_nopage,
#if defined(CONFIG_NUMA)
	.set_policy = shm_set_policy,
	.get_policy = shm_get_policy,
#endif
};

static int newseg (struct ipc_namespace *ns, key_t key, int shmflg, size_t size)
{
	int error;
	struct shmid_kernel *shp;
	int numpages = (size + PAGE_SIZE -1) >> PAGE_SHIFT;
	struct file * file;
	char name[13];
	int id;

	if (size < SHMMIN || size > ns->shm_ctlmax)
		return -EINVAL;

	if (ns->shm_tot + numpages > ns->shm_ctlall)
		return -ENOSPC;

	shp = ipc_rcu_alloc(sizeof(*shp));
	if (!shp)
		return -ENOMEM;

	shp->shm_perm.key = key;
	shp->shm_perm.mode = (shmflg & S_IRWXUGO);
	shp->mlock_user = NULL;

	shp->shm_perm.security = NULL;
	error = security_shm_alloc(shp);
	if (error) {
		ipc_rcu_putref(shp);
		return error;
	}

	if (shmflg & SHM_HUGETLB) {
		/* hugetlb_zero_setup takes care of mlock user accounting */
		file = hugetlb_zero_setup(size);
		shp->mlock_user = current->user;
	} 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;
		sprintf (name, "SYSV%08x", key);
		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) 
		goto no_id;

	shp->shm_cprid = current->tgid;
	shp->shm_lprid = 0;
	shp->shm_atim = shp->shm_dtim = 0;
	shp->shm_ctim = get_seconds();
	shp->shm_segsz = size;
	shp->shm_nattch = 0;
	shp->id = shm_buildid(ns, id, shp->shm_perm.seq);
	shp->shm_file = file;

	ns->shm_tot += numpages;
	shm_unlock(shp);
	return shp->id;

no_id:
	fput(file);
no_file:
	security_shm_free(shp);
	ipc_rcu_putref(shp);
	return error;
}

asmlinkage long sys_shmget (key_t key, size_t size, int shmflg)
{
	struct shmid_kernel *shp;<commit_msg>Restore shmid as inode# to fix /proc/pid/maps ABI breakage<commit_after>/*
 * linux/ipc/shm.c
 * Copyright (C) 1992, 1993 <NAME>
 *	 Many improvements/fixes by <NAME>.
 * Replaced `struct shm_desc' by `struct vm_area_struct', July 1994.
 * Fixed the shm swap deallocation (shm_unuse()), August 1998 Andrea Arcangeli.
 *
 * /proc/sysvipc/shm support (c) 1999 <NAME> <<EMAIL>>
 * BIGMEM support, Andrea Arcangeli <<EMAIL>>
 * SMP thread shm, <NAME> <<EMAIL>>
 * HIGHMEM support, <NAME> <<EMAIL>>
 * Make shmmax, shmall, shmmni sysctl'able, <NAME> <<EMAIL>>
 * Shared /dev/zero support, <NAME> <<EMAIL>>
 * Move the mm functionality over to mm/shmem.c, <NAME> <<EMAIL>>
 *
 * support for audit of ipc object properties and permission changes
 * <NAME> <<EMAIL>>
 *
 * namespaces support
 * OpenVZ, SWsoft Inc.
 * <NAME> <<EMAIL>>
 */

#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/hugetlb.h>
#include <linux/shm.h>
#include <linux/init.h>
#include <linux/file.h>
#include <linux/mman.h>
#include <linux/shmem_fs.h>
#include <linux/security.h>
#include <linux/syscalls.h>
#include <linux/audit.h>
#include <linux/capability.h>
#include <linux/ptrace.h>
#include <linux/seq_file.h>
#include <linux/mutex.h>
#include <linux/nsproxy.h>
#include <linux/mount.h>

#include <asm/uaccess.h>

#include "util.h"

struct shm_file_data {
	int id;
	struct ipc_namespace *ns;
	struct file *file;
	const struct vm_operations_struct *vm_ops;
};

#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 struct ipc_ids init_shm_ids;

#define shm_ids(ns)	(*((ns)->ids[IPC_SHM_IDS]))

#define shm_lock(ns, id)		\
	((struct shmid_kernel*)ipc_lock(&shm_ids(ns),id))
#define shm_unlock(shp)			\
	ipc_unlock(&(shp)->shm_perm)
#define shm_get(ns, id)			\
	((struct shmid_kernel*)ipc_get(&shm_ids(ns),id))
#define shm_buildid(ns, id, seq)	\
	ipc_buildid(&shm_ids(ns), id, seq)

static int newseg (struct ipc_namespace *ns, key_t key,
		int shmflg, size_t size);
static void shm_open(struct vm_area_struct *vma);
static void shm_close(struct vm_area_struct *vma);
static void shm_destroy (struct ipc_namespace *ns, struct shmid_kernel *shp);
#ifdef CONFIG_PROC_FS
static int sysvipc_shm_proc_show(struct seq_file *s, void *it);
#endif

static void __ipc_init __shm_init_ns(struct ipc_namespace *ns, struct ipc_ids *ids)
{
	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, 1);
}

static void do_shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *shp)
{
	if (shp->shm_nattch){
		shp->shm_perm.mode |= SHM_DEST;
		/* Do not find it any more */
		shp->shm_perm.key = IPC_PRIVATE;
		shm_unlock(shp);
	} else
		shm_destroy(ns, shp);
}

#ifdef CONFIG_IPC_NS
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;
}

void shm_exit_ns(struct ipc_namespace *ns)
{
	int i;
	struct shmid_kernel *shp;

	mutex_lock(&shm_ids(ns).mutex);
	for (i = 0; i <= shm_ids(ns).max_id; i++) {
		shp = shm_lock(ns, i);
		if (shp == NULL)
			continue;

		do_shm_rmid(ns, shp);
	}
	mutex_unlock(&shm_ids(ns).mutex);

	ipc_fini_ids(ns->ids[IPC_SHM_IDS]);
	kfree(ns->ids[IPC_SHM_IDS]);
	ns->ids[IPC_SHM_IDS] = NULL;
}
#endif

void __init shm_init (void)
{
	__shm_init_ns(&init_ipc_ns, &init_shm_ids);
	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);
}

static inline int shm_checkid(struct ipc_namespace *ns,
		struct shmid_kernel *s, int id)
{
	if (ipc_checkid(&shm_ids(ns), &s->shm_perm, id))
		return -EIDRM;
	return 0;
}

static inline struct shmid_kernel *shm_rmid(struct ipc_namespace *ns, int id)
{
	return (struct shmid_kernel *)ipc_rmid(&shm_ids(ns), id);
}

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)
{
	struct file *file = vma->vm_file;
	struct shm_file_data *sfd = shm_file_data(file);
	struct shmid_kernel *shp;

	shp = shm_lock(sfd->ns, sfd->id);
	BUG_ON(!shp);
	shp->shm_atim = get_seconds();
	shp->shm_lprid = current->tgid;
	shp->shm_nattch++;
	shm_unlock(shp);
}

/*
 * shm_destroy - free the struct shmid_kernel
 *
 * @shp: struct to free
 *
 * It has to be called with shp and shm_ids.mutex locked,
 * but returns with shp unlocked and freed.
 */
static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp)
{
	ns->shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT;
	shm_rmid(ns, shp->id);
	shm_unlock(shp);
	if (!is_file_hugepages(shp->shm_file))
		shmem_lock(shp->shm_file, 0, shp->mlock_user);
	else
		user_shm_unlock(shp->shm_file->f_path.dentry->d_inode->i_size,
						shp->mlock_user);
	fput (shp->shm_file);
	security_shm_free(shp);
	ipc_rcu_putref(shp);
}

/*
 * remove the attach descriptor vma.
 * free memory for segment if it is marked destroyed.
 * The descriptor has already been removed from the current->mm->mmap list
 * and will later be kfree()d.
 */
static void shm_close(struct vm_area_struct *vma)
{
	struct file * file = vma->vm_file;
	struct shm_file_data *sfd = shm_file_data(file);
	struct shmid_kernel *shp;
	struct ipc_namespace *ns = sfd->ns;

	mutex_lock(&shm_ids(ns).mutex);
	/* remove from the list of attaches of the shm segment */
	shp = shm_lock(ns, sfd->id);
	BUG_ON(!shp);
	shp->shm_lprid = current->tgid;
	shp->shm_dtim = get_seconds();
	shp->shm_nattch--;
	if(shp->shm_nattch == 0 &&
	   shp->shm_perm.mode & SHM_DEST)
		shm_destroy(ns, shp);
	else
		shm_unlock(shp);
	mutex_unlock(&shm_ids(ns).mutex);
}

static struct page *shm_nopage(struct vm_area_struct *vma,
			       unsigned long address, int *type)
{
	struct file *file = vma->vm_file;
	struct shm_file_data *sfd = shm_file_data(file);

	return sfd->vm_ops->nopage(vma, address, type);
}

#ifdef CONFIG_NUMA
int shm_set_policy(struct vm_area_struct *vma, struct mempolicy *new)
{
	struct file *file = vma->vm_file;
	struct shm_file_data *sfd = shm_file_data(file);
	int err = 0;
	if (sfd->vm_ops->set_policy)
		err = sfd->vm_ops->set_policy(vma, new);
	return err;
}

struct mempolicy *shm_get_policy(struct vm_area_struct *vma, unsigned long addr)
{
	struct file *file = vma->vm_file;
	struct shm_file_data *sfd = shm_file_data(file);
	struct mempolicy *pol = NULL;

	if (sfd->vm_ops->get_policy)
		pol = sfd->vm_ops->get_policy(vma, addr);
	else
		pol = vma->vm_policy;
	return pol;
}
#endif

static int shm_mmap(struct file * file, struct vm_area_struct * vma)
{
	struct shm_file_data *sfd = shm_file_data(file);
	int ret;

	ret = sfd->file->f_op->mmap(sfd->file, vma);
	if (ret != 0)
		return ret;
	sfd->vm_ops = vma->vm_ops;
	vma->vm_ops = &shm_vm_ops;
	shm_open(vma);

	return ret;
}

static int shm_release(struct inode *ino, struct file *file)
{
	struct shm_file_data *sfd = shm_file_data(file);

	put_ipc_ns(sfd->ns);
	shm_file_data(file) = NULL;
	kfree(sfd);
	return 0;
}

static int shm_fsync(struct file *file, struct dentry *dentry, int datasync)
{
	int (*fsync) (struct file *, struct dentry *, int datasync);
	struct shm_file_data *sfd = shm_file_data(file);
	int ret = -EINVAL;

	fsync = sfd->file->f_op->fsync;
	if (fsync)
		ret = fsync(sfd->file, sfd->file->f_path.dentry, datasync);
	return ret;
}

static unsigned long shm_get_unmapped_area(struct file *file,
	unsigned long addr, unsigned long len, unsigned long pgoff,
	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;
}

static const struct file_operations shm_file_operations = {
	.mmap		= shm_mmap,
	.fsync		= shm_fsync,
	.release	= shm_release,
	.get_unmapped_area	= shm_get_unmapped_area,
};

static 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 */
	.nopage	= shm_nopage,
#if defined(CONFIG_NUMA)
	.set_policy = shm_set_policy,
	.get_policy = shm_get_policy,
#endif
};

static int newseg (struct ipc_namespace *ns, key_t key, int shmflg, size_t size)
{
	int error;
	struct shmid_kernel *shp;
	int numpages = (size + PAGE_SIZE -1) >> PAGE_SHIFT;
	struct file * file;
	char name[13];
	int id;

	if (size < SHMMIN || size > ns->shm_ctlmax)
		return -EINVAL;

	if (ns->shm_tot + numpages > ns->shm_ctlall)
		return -ENOSPC;

	shp = ipc_rcu_alloc(sizeof(*shp));
	if (!shp)
		return -ENOMEM;

	shp->shm_perm.key = key;
	shp->shm_perm.mode = (shmflg & S_IRWXUGO);
	shp->mlock_user = NULL;

	shp->shm_perm.security = NULL;
	error = security_shm_alloc(shp);
	if (error) {
		ipc_rcu_putref(shp);
		return error;
	}

	if (shmflg & SHM_HUGETLB) {
		/* hugetlb_zero_setup takes care of mlock user accounting */
		file = hugetlb_zero_setup(size);
		shp->mlock_user = current->user;
	} 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;
		sprintf (name, "SYSV%08x", key);
		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) 
		goto no_id;

	shp->shm_cprid = current->tgid;
	shp->shm_lprid = 0;
	shp->shm_atim = shp->shm_dtim = 0;
	shp->shm_ctim = get_seconds();
	shp->shm_segsz = size;
	shp->shm_nattch = 0;
	shp->id = shm_buildid(ns, id, shp->shm_perm.seq);
	shp->shm_file = file;
	/*
	 * shmid gets reported as "inode#" in /proc/pid/maps.
	 * proc-ps tools use this. Changing this will break them.
	 */
	file->f_dentry->d_inode->i_ino = shp->id;

	ns->shm_tot += numpages;
	shm_unlock(shp);
	return shp->id;

no_id:
	fput(file);
no_file:
	security_shm_free(shp);
	ipc_rcu_putref(shp);
	return error;
}

asmlinkage long sys_shmget (key_t key, size_t size, int shmflg)
{
	struct shmid_kernel *shp;
{'fraction_non_alphanumeric': 0.13744417230946548, 'fraction_numerical': 0.004034000864428756, 'mean_word_length': 4.526539278131635, 'pattern_counts': {'":': 0, '<': 101, '<?xml version=': 0, '>': 313, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
{'dir': 'git-commits-cleaned', 'id': '848735', 'n_tokens_mistral': 9190, 'n_tokens_neox': 8920, 'n_words': 1981}