diff options
Diffstat (limited to 'mm/tiny-shmem.c')
-rw-r--r-- | mm/tiny-shmem.c | 134 |
1 files changed, 0 insertions, 134 deletions
diff --git a/mm/tiny-shmem.c b/mm/tiny-shmem.c deleted file mode 100644 index 3e67d575ee6e..000000000000 --- a/mm/tiny-shmem.c +++ /dev/null | |||
@@ -1,134 +0,0 @@ | |||
1 | /* | ||
2 | * tiny-shmem.c: simple shmemfs and tmpfs using ramfs code | ||
3 | * | ||
4 | * Matt Mackall <mpm@selenic.com> January, 2004 | ||
5 | * derived from mm/shmem.c and fs/ramfs/inode.c | ||
6 | * | ||
7 | * This is intended for small system where the benefits of the full | ||
8 | * shmem code (swap-backed and resource-limited) are outweighed by | ||
9 | * their complexity. On systems without swap this code should be | ||
10 | * effectively equivalent, but much lighter weight. | ||
11 | */ | ||
12 | |||
13 | #include <linux/fs.h> | ||
14 | #include <linux/init.h> | ||
15 | #include <linux/vfs.h> | ||
16 | #include <linux/mount.h> | ||
17 | #include <linux/file.h> | ||
18 | #include <linux/mm.h> | ||
19 | #include <linux/module.h> | ||
20 | #include <linux/swap.h> | ||
21 | #include <linux/ramfs.h> | ||
22 | |||
23 | static struct file_system_type tmpfs_fs_type = { | ||
24 | .name = "tmpfs", | ||
25 | .get_sb = ramfs_get_sb, | ||
26 | .kill_sb = kill_litter_super, | ||
27 | }; | ||
28 | |||
29 | static struct vfsmount *shm_mnt; | ||
30 | |||
31 | static int __init init_tmpfs(void) | ||
32 | { | ||
33 | BUG_ON(register_filesystem(&tmpfs_fs_type) != 0); | ||
34 | |||
35 | shm_mnt = kern_mount(&tmpfs_fs_type); | ||
36 | BUG_ON(IS_ERR(shm_mnt)); | ||
37 | |||
38 | return 0; | ||
39 | } | ||
40 | module_init(init_tmpfs) | ||
41 | |||
42 | /** | ||
43 | * shmem_file_setup - get an unlinked file living in tmpfs | ||
44 | * @name: name for dentry (to be seen in /proc/<pid>/maps | ||
45 | * @size: size to be set for the file | ||
46 | * @flags: vm_flags | ||
47 | */ | ||
48 | struct file *shmem_file_setup(char *name, loff_t size, unsigned long flags) | ||
49 | { | ||
50 | int error; | ||
51 | struct file *file; | ||
52 | struct inode *inode; | ||
53 | struct dentry *dentry, *root; | ||
54 | struct qstr this; | ||
55 | |||
56 | if (IS_ERR(shm_mnt)) | ||
57 | return (void *)shm_mnt; | ||
58 | |||
59 | error = -ENOMEM; | ||
60 | this.name = name; | ||
61 | this.len = strlen(name); | ||
62 | this.hash = 0; /* will go */ | ||
63 | root = shm_mnt->mnt_root; | ||
64 | dentry = d_alloc(root, &this); | ||
65 | if (!dentry) | ||
66 | goto put_memory; | ||
67 | |||
68 | error = -ENFILE; | ||
69 | file = get_empty_filp(); | ||
70 | if (!file) | ||
71 | goto put_dentry; | ||
72 | |||
73 | error = -ENOSPC; | ||
74 | inode = ramfs_get_inode(root->d_sb, S_IFREG | S_IRWXUGO, 0); | ||
75 | if (!inode) | ||
76 | goto close_file; | ||
77 | |||
78 | d_instantiate(dentry, inode); | ||
79 | inode->i_size = size; | ||
80 | inode->i_nlink = 0; /* It is unlinked */ | ||
81 | init_file(file, shm_mnt, dentry, FMODE_WRITE | FMODE_READ, | ||
82 | &ramfs_file_operations); | ||
83 | |||
84 | #ifndef CONFIG_MMU | ||
85 | error = ramfs_nommu_expand_for_mapping(inode, size); | ||
86 | if (error) | ||
87 | goto close_file; | ||
88 | #endif | ||
89 | return file; | ||
90 | |||
91 | close_file: | ||
92 | put_filp(file); | ||
93 | put_dentry: | ||
94 | dput(dentry); | ||
95 | put_memory: | ||
96 | return ERR_PTR(error); | ||
97 | } | ||
98 | EXPORT_SYMBOL_GPL(shmem_file_setup); | ||
99 | |||
100 | /** | ||
101 | * shmem_zero_setup - setup a shared anonymous mapping | ||
102 | * @vma: the vma to be mmapped is prepared by do_mmap_pgoff | ||
103 | */ | ||
104 | int shmem_zero_setup(struct vm_area_struct *vma) | ||
105 | { | ||
106 | struct file *file; | ||
107 | loff_t size = vma->vm_end - vma->vm_start; | ||
108 | |||
109 | file = shmem_file_setup("dev/zero", size, vma->vm_flags); | ||
110 | if (IS_ERR(file)) | ||
111 | return PTR_ERR(file); | ||
112 | |||
113 | if (vma->vm_file) | ||
114 | fput(vma->vm_file); | ||
115 | vma->vm_file = file; | ||
116 | vma->vm_ops = &generic_file_vm_ops; | ||
117 | return 0; | ||
118 | } | ||
119 | |||
120 | int shmem_unuse(swp_entry_t entry, struct page *page) | ||
121 | { | ||
122 | return 0; | ||
123 | } | ||
124 | |||
125 | #ifndef CONFIG_MMU | ||
126 | unsigned long shmem_get_unmapped_area(struct file *file, | ||
127 | unsigned long addr, | ||
128 | unsigned long len, | ||
129 | unsigned long pgoff, | ||
130 | unsigned long flags) | ||
131 | { | ||
132 | return ramfs_nommu_get_unmapped_area(file, addr, len, pgoff, flags); | ||
133 | } | ||
134 | #endif | ||