diff options
Diffstat (limited to 'mm/shmem.c')
| -rw-r--r-- | mm/shmem.c | 31 |
1 files changed, 17 insertions, 14 deletions
diff --git a/mm/shmem.c b/mm/shmem.c index dbe0c1e83..d88bf98f0 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -1396,7 +1396,7 @@ static int shmem_mmap(struct file *file, struct vm_area_struct *vma) } static struct inode *shmem_get_inode(struct super_block *sb, const struct inode *dir, - umode_t mode, dev_t dev, unsigned long flags) + umode_t mode, dev_t dev, unsigned long flags, int atomic_copy) { struct inode *inode; struct shmem_inode_info *info; @@ -1417,6 +1417,8 @@ static struct inode *shmem_get_inode(struct super_block *sb, const struct inode spin_lock_init(&info->lock); info->seals = F_SEAL_SEAL; info->flags = flags & VM_NORESERVE; + if (atomic_copy) + inode->i_flags |= S_ATOMIC_COPY; INIT_LIST_HEAD(&info->swaplist); simple_xattrs_init(&info->xattrs); cache_no_acl(inode); @@ -2206,7 +2208,7 @@ shmem_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) struct inode *inode; int error = -ENOSPC; - inode = shmem_get_inode(dir->i_sb, dir, mode, dev, VM_NORESERVE); + inode = shmem_get_inode(dir->i_sb, dir, mode, dev, VM_NORESERVE, 0); if (inode) { error = simple_acl_create(dir, inode); if (error) @@ -2235,7 +2237,7 @@ shmem_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) struct inode *inode; int error = -ENOSPC; - inode = shmem_get_inode(dir->i_sb, dir, mode, 0, VM_NORESERVE); + inode = shmem_get_inode(dir->i_sb, dir, mode, 0, VM_NORESERVE, 0); if (inode) { error = security_inode_init_security(inode, dir, NULL, @@ -2428,7 +2430,7 @@ static int shmem_symlink(struct inode *dir, struct dentry *dentry, const char *s if (len > PAGE_CACHE_SIZE) return -ENAMETOOLONG; - inode = shmem_get_inode(dir->i_sb, dir, S_IFLNK|S_IRWXUGO, 0, VM_NORESERVE); + inode = shmem_get_inode(dir->i_sb, dir, S_IFLNK|S_IRWXUGO, 0, VM_NORESERVE, 0); if (!inode) return -ENOSPC; @@ -2946,7 +2948,7 @@ SYSCALL_DEFINE2(memfd_create, goto err_name; } - file = shmem_file_setup(name, 0, VM_NORESERVE); + file = shmem_file_setup(name, 0, VM_NORESERVE, 0); if (IS_ERR(file)) { error = PTR_ERR(file); goto err_fd; @@ -3037,7 +3039,7 @@ int shmem_fill_super(struct super_block *sb, void *data, int silent) sb->s_flags |= MS_POSIXACL; #endif - inode = shmem_get_inode(sb, NULL, S_IFDIR | sbinfo->mode, 0, VM_NORESERVE); + inode = shmem_get_inode(sb, NULL, S_IFDIR | sbinfo->mode, 0, VM_NORESERVE, 0); if (!inode) goto failed; inode->i_uid = sbinfo->uid; @@ -3291,7 +3293,7 @@ EXPORT_SYMBOL_GPL(shmem_truncate_range); #define shmem_vm_ops generic_file_vm_ops #define shmem_file_operations ramfs_file_operations -#define shmem_get_inode(sb, dir, mode, dev, flags) ramfs_get_inode(sb, dir, mode, dev) +#define shmem_get_inode(sb, dir, mode, dev, flags, atomic_copy) ramfs_get_inode(sb, dir, mode, dev) #define shmem_acct_size(flags, size) 0 #define shmem_unacct_size(flags, size) do {} while (0) @@ -3304,7 +3306,8 @@ static struct dentry_operations anon_ops = { }; static struct file *__shmem_file_setup(const char *name, loff_t size, - unsigned long flags, unsigned int i_flags) + unsigned long flags, unsigned int i_flags, + int atomic_copy) { struct file *res; struct inode *inode; @@ -3333,7 +3336,7 @@ static struct file *__shmem_file_setup(const char *name, loff_t size, d_set_d_op(path.dentry, &anon_ops); res = ERR_PTR(-ENOSPC); - inode = shmem_get_inode(sb, NULL, S_IFREG | S_IRWXUGO, 0, flags); + inode = shmem_get_inode(sb, NULL, S_IFREG | S_IRWXUGO, 0, flags, atomic_copy); if (!inode) goto put_memory; @@ -3369,9 +3372,9 @@ put_path: * @size: size to be set for the file * @flags: VM_NORESERVE suppresses pre-accounting of the entire object size */ -struct file *shmem_kernel_file_setup(const char *name, loff_t size, unsigned long flags) +struct file *shmem_kernel_file_setup(const char *name, loff_t size, unsigned long flags, int atomic_copy) { - return __shmem_file_setup(name, size, flags, S_PRIVATE); + return __shmem_file_setup(name, size, flags, S_PRIVATE, atomic_copy); } /** @@ -3380,9 +3383,9 @@ struct file *shmem_kernel_file_setup(const char *name, loff_t size, unsigned lon * @size: size to be set for the file * @flags: VM_NORESERVE suppresses pre-accounting of the entire object size */ -struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags) +struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags, int atomic_copy) { - return __shmem_file_setup(name, size, flags, 0); + return __shmem_file_setup(name, size, flags, 0, atomic_copy); } EXPORT_SYMBOL_GPL(shmem_file_setup); @@ -3401,7 +3404,7 @@ int shmem_zero_setup(struct vm_area_struct *vma) * accessible to the user through its mapping, use S_PRIVATE flag to * bypass file security, in the same way as shmem_kernel_file_setup(). */ - file = __shmem_file_setup("dev/zero", size, vma->vm_flags, S_PRIVATE); + file = __shmem_file_setup("dev/zero", size, vma->vm_flags, S_PRIVATE, 0); if (IS_ERR(file)) return PTR_ERR(file); |