linux-master/mm/shmem.c

164 static inline int shmem_acct_size(unsigned long flags, loff_t size)
166 	return (flags & VM_NORESERVE) ?
170 static inline void shmem_unacct_size(unsigned long flags, loff_t size)
172 	if (!(flags & VM_NORESERVE))
176 static inline int shmem_reacct_size(unsigned long flags,
179 	if (!(flags & VM_NORESERVE)) {
195 static inline int shmem_acct_blocks(unsigned long flags, long pages)
197 	if (!(flags & VM_NORESERVE))
204 static inline void shmem_unacct_blocks(unsigned long flags, long pages)
206 	if (flags & VM_NORESERVE)
216 	if (shmem_acct_blocks(info->flags, pages))
239 	shmem_unacct_blocks(info->flags, pages);
253 	shmem_unacct_blocks(info->flags, pages);
292 	sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
551 	if (mm && ((vm_flags & VM_NOHUGEPAGE) || test_bit(MMF_DISABLE_THP, &mm->flags)))
1182 			error = shmem_reacct_size(SHMEM_I(inode)->flags,
1239 		shmem_unacct_size(info->flags, inode->i_size);
1439 	if (WARN_ON_ONCE((info->flags & VM_LOCKED) || sbinfo->noswap))
1584  * Some of the flags set permissions, while others set limitations.
1597 	 * Minimize the result gfp by taking the union with the deny flags,
1598 	 * and the intersection of the allow flags.
2139  * @sgp:	SGP_* flags to control behavior
2151  *  - for all other flags a new folio is allocated, inserted into the
2268 				      unsigned long pgoff, unsigned long flags)
2280 				    flags);
2295 	if (flags & MAP_FIXED)
2338 					     inflated_len, 0, flags);
2405 	 * What serializes the accesses to info->flags?
2409 	if (lock && !(info->flags & VM_LOCKED)) {
2412 		info->flags |= VM_LOCKED;
2415 	if (!lock && (info->flags & VM_LOCKED) && ucounts) {
2417 		info->flags &= ~VM_LOCKED;
2491 					     dev_t dev, unsigned long flags)
2519 	info->flags = flags & VM_NORESERVE;
2569 				     umode_t mode, dev_t dev, unsigned long flags)
2574 	inode = __shmem_get_inode(idmap, sb, dir, mode, dev, flags);
2597 				     umode_t mode, dev_t dev, unsigned long flags)
2599 	return __shmem_get_inode(idmap, sb, dir, mode, dev, flags);
2608 			   uffd_flags_t flags,
2640 		if (uffd_flags_mode_is(flags, MFILL_ATOMIC_COPY)) {
2701 				       &folio->page, true, flags);
2972 				      size_t len, unsigned int flags)
3447 			 unsigned int flags)
3453 	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
3456 	if (flags & RENAME_EXCHANGE)
3463 	if (flags & RENAME_WHITEOUT) {
3610 	if (fa->flags & ~SHMEM_FL_USER_MODIFIABLE)
3614 		(fa->flags & SHMEM_FL_USER_MODIFIABLE);
3707 				   size_t size, int flags)
3727 	old_xattr = simple_xattr_set(&info->xattrs, name, value, size, flags);
4800 				      unsigned long pgoff, unsigned long flags)
4802 	return mm_get_unmapped_area(current->mm, file, addr, len, pgoff, flags);
4815 #define shmem_acct_size(flags, size)		0
4816 #define shmem_unacct_size(flags, size)		do {} while (0)
4820 				umode_t mode, dev_t dev, unsigned long flags)
4831 			loff_t size, unsigned long flags, unsigned int i_flags)
4842 	if (shmem_acct_size(flags, size))
4849 				S_IFREG | S_IRWXUGO, 0, flags);
4851 		shmem_unacct_size(flags, size);
4874  * @flags: VM_NORESERVE suppresses pre-accounting of the entire object size
4876 struct file *shmem_kernel_file_setup(const char *name, loff_t size, unsigned long flags)
4878 	return __shmem_file_setup(shm_mnt, name, size, flags, S_PRIVATE);
4886  * @flags: VM_NORESERVE suppresses pre-accounting of the entire object size
4888 struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags)
4890 	return __shmem_file_setup(shm_mnt, name, size, flags, 0);
4899  * @flags: VM_NORESERVE suppresses pre-accounting of the entire object size
4902 				       loff_t size, unsigned long flags)
4904 	return __shmem_file_setup(mnt, name, size, flags, 0);
4936  * shmem_read_folio_gfp - read into page cache, using specified page allocation flags.
4939  * @gfp:	the page allocator flags to use if allocating
4942  * with any new page allocations done using the specified allocation flags.