shmem.c (15520a3f046998e3f57e695743e99b0875e2dae7) shmem.c (d09e8ca6cb93bb4b97517a18fbbf7eccb0e9ff43)
1/*
2 * Resizable virtual memory filesystem for Linux.
3 *
4 * Copyright (C) 2000 Linus Torvalds.
5 * 2000 Transmeta Corp.
6 * 2000-2001 Christoph Rohland
7 * 2000-2001 SAP AG
8 * 2002 Red Hat Inc.

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232
233static const struct super_operations shmem_ops;
234const struct address_space_operations shmem_aops;
235static const struct file_operations shmem_file_operations;
236static const struct inode_operations shmem_inode_operations;
237static const struct inode_operations shmem_dir_inode_operations;
238static const struct inode_operations shmem_special_inode_operations;
239static const struct vm_operations_struct shmem_vm_ops;
1/*
2 * Resizable virtual memory filesystem for Linux.
3 *
4 * Copyright (C) 2000 Linus Torvalds.
5 * 2000 Transmeta Corp.
6 * 2000-2001 Christoph Rohland
7 * 2000-2001 SAP AG
8 * 2002 Red Hat Inc.

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232
233static const struct super_operations shmem_ops;
234const struct address_space_operations shmem_aops;
235static const struct file_operations shmem_file_operations;
236static const struct inode_operations shmem_inode_operations;
237static const struct inode_operations shmem_dir_inode_operations;
238static const struct inode_operations shmem_special_inode_operations;
239static const struct vm_operations_struct shmem_vm_ops;
240static const struct vm_operations_struct shmem_anon_vm_ops;
240static struct file_system_type shmem_fs_type;
241
241static struct file_system_type shmem_fs_type;
242
243bool vma_is_anon_shmem(struct vm_area_struct *vma)
244{
245 return vma->vm_ops == &shmem_anon_vm_ops;
246}
247
242bool vma_is_shmem(struct vm_area_struct *vma)
243{
248bool vma_is_shmem(struct vm_area_struct *vma)
249{
244 return vma->vm_ops == &shmem_vm_ops;
250 return vma_is_anon_shmem(vma) || vma->vm_ops == &shmem_vm_ops;
245}
246
247static LIST_HEAD(shmem_swaplist);
248static DEFINE_MUTEX(shmem_swaplist_mutex);
249
250/*
251 * shmem_reserve_inode() performs bookkeeping to reserve a shmem inode, and
252 * produces a novel ino for the newly allocated inode.

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2258 retval = 0;
2259
2260out_nomem:
2261 return retval;
2262}
2263
2264static int shmem_mmap(struct file *file, struct vm_area_struct *vma)
2265{
251}
252
253static LIST_HEAD(shmem_swaplist);
254static DEFINE_MUTEX(shmem_swaplist_mutex);
255
256/*
257 * shmem_reserve_inode() performs bookkeeping to reserve a shmem inode, and
258 * produces a novel ino for the newly allocated inode.

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2264 retval = 0;
2265
2266out_nomem:
2267 return retval;
2268}
2269
2270static int shmem_mmap(struct file *file, struct vm_area_struct *vma)
2271{
2266 struct shmem_inode_info *info = SHMEM_I(file_inode(file));
2272 struct inode *inode = file_inode(file);
2273 struct shmem_inode_info *info = SHMEM_I(inode);
2267 int ret;
2268
2269 ret = seal_check_future_write(info->seals, vma);
2270 if (ret)
2271 return ret;
2272
2273 /* arm64 - allow memory tagging on RAM-based files */
2274 vma->vm_flags |= VM_MTE_ALLOWED;
2275
2276 file_accessed(file);
2274 int ret;
2275
2276 ret = seal_check_future_write(info->seals, vma);
2277 if (ret)
2278 return ret;
2279
2280 /* arm64 - allow memory tagging on RAM-based files */
2281 vma->vm_flags |= VM_MTE_ALLOWED;
2282
2283 file_accessed(file);
2277 vma->vm_ops = &shmem_vm_ops;
2284 /* This is anonymous shared memory if it is unlinked at the time of mmap */
2285 if (inode->i_nlink)
2286 vma->vm_ops = &shmem_vm_ops;
2287 else
2288 vma->vm_ops = &shmem_anon_vm_ops;
2278 return 0;
2279}
2280
2281#ifdef CONFIG_TMPFS_XATTR
2282static int shmem_initxattrs(struct inode *, const struct xattr *, void *);
2283
2284/*
2285 * chattr's fsflags are unrelated to extended attributes,

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3983 .fault = shmem_fault,
3984 .map_pages = filemap_map_pages,
3985#ifdef CONFIG_NUMA
3986 .set_policy = shmem_set_policy,
3987 .get_policy = shmem_get_policy,
3988#endif
3989};
3990
2289 return 0;
2290}
2291
2292#ifdef CONFIG_TMPFS_XATTR
2293static int shmem_initxattrs(struct inode *, const struct xattr *, void *);
2294
2295/*
2296 * chattr's fsflags are unrelated to extended attributes,

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3994 .fault = shmem_fault,
3995 .map_pages = filemap_map_pages,
3996#ifdef CONFIG_NUMA
3997 .set_policy = shmem_set_policy,
3998 .get_policy = shmem_get_policy,
3999#endif
4000};
4001
4002static const struct vm_operations_struct shmem_anon_vm_ops = {
4003 .fault = shmem_fault,
4004 .map_pages = filemap_map_pages,
4005#ifdef CONFIG_NUMA
4006 .set_policy = shmem_set_policy,
4007 .get_policy = shmem_get_policy,
4008#endif
4009};
4010
3991int shmem_init_fs_context(struct fs_context *fc)
3992{
3993 struct shmem_options *ctx;
3994
3995 ctx = kzalloc(sizeof(struct shmem_options), GFP_KERNEL);
3996 if (!ctx)
3997 return -ENOMEM;
3998

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4158
4159void shmem_truncate_range(struct inode *inode, loff_t lstart, loff_t lend)
4160{
4161 truncate_inode_pages_range(inode->i_mapping, lstart, lend);
4162}
4163EXPORT_SYMBOL_GPL(shmem_truncate_range);
4164
4165#define shmem_vm_ops generic_file_vm_ops
4011int shmem_init_fs_context(struct fs_context *fc)
4012{
4013 struct shmem_options *ctx;
4014
4015 ctx = kzalloc(sizeof(struct shmem_options), GFP_KERNEL);
4016 if (!ctx)
4017 return -ENOMEM;
4018

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4178
4179void shmem_truncate_range(struct inode *inode, loff_t lstart, loff_t lend)
4180{
4181 truncate_inode_pages_range(inode->i_mapping, lstart, lend);
4182}
4183EXPORT_SYMBOL_GPL(shmem_truncate_range);
4184
4185#define shmem_vm_ops generic_file_vm_ops
4186#define shmem_anon_vm_ops generic_file_vm_ops
4166#define shmem_file_operations ramfs_file_operations
4167#define shmem_get_inode(sb, dir, mode, dev, flags) ramfs_get_inode(sb, dir, mode, dev)
4168#define shmem_acct_size(flags, size) 0
4169#define shmem_unacct_size(flags, size) do {} while (0)
4170
4171#endif /* CONFIG_SHMEM */
4172
4173/* common code */

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4263 */
4264 file = shmem_kernel_file_setup("dev/zero", size, vma->vm_flags);
4265 if (IS_ERR(file))
4266 return PTR_ERR(file);
4267
4268 if (vma->vm_file)
4269 fput(vma->vm_file);
4270 vma->vm_file = file;
4187#define shmem_file_operations ramfs_file_operations
4188#define shmem_get_inode(sb, dir, mode, dev, flags) ramfs_get_inode(sb, dir, mode, dev)
4189#define shmem_acct_size(flags, size) 0
4190#define shmem_unacct_size(flags, size) do {} while (0)
4191
4192#endif /* CONFIG_SHMEM */
4193
4194/* common code */

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4284 */
4285 file = shmem_kernel_file_setup("dev/zero", size, vma->vm_flags);
4286 if (IS_ERR(file))
4287 return PTR_ERR(file);
4288
4289 if (vma->vm_file)
4290 fput(vma->vm_file);
4291 vma->vm_file = file;
4271 vma->vm_ops = &shmem_vm_ops;
4292 vma->vm_ops = &shmem_anon_vm_ops;
4272
4273 return 0;
4274}
4275
4276/**
4277 * shmem_read_mapping_page_gfp - read into page cache, using specified page allocation flags.
4278 * @mapping: the page's address_space
4279 * @index: the page index

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4294 return 0;
4295}
4296
4297/**
4298 * shmem_read_mapping_page_gfp - read into page cache, using specified page allocation flags.
4299 * @mapping: the page's address_space
4300 * @index: the page index

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