| shm.c (a23e1966932464e1c5226cb9ac4ce1d5fc10ba22) | shm.c (63fc66f5b6b18f39269a66cf34d8cb7a24fbfe88) |
|---|---|
| 1// SPDX-License-Identifier: GPL-2.0 2/* 3 * linux/ipc/shm.c 4 * Copyright (C) 1992, 1993 Krishna Balasubramanian 5 * Many improvements/fixes by Bruno Haible. 6 * Replaced `struct shm_desc' by `struct vm_area_struct', July 1994. 7 * Fixed the shm swap deallocation (shm_unuse()), August 1998 Andrea Arcangeli. 8 * --- 648 unchanged lines hidden (view full) --- 657 .fsync = shm_fsync, 658 .release = shm_release, 659 .get_unmapped_area = shm_get_unmapped_area, 660 .llseek = noop_llseek, 661 .fallocate = shm_fallocate, 662}; 663 664/* | 1// SPDX-License-Identifier: GPL-2.0 2/* 3 * linux/ipc/shm.c 4 * Copyright (C) 1992, 1993 Krishna Balasubramanian 5 * Many improvements/fixes by Bruno Haible. 6 * Replaced `struct shm_desc' by `struct vm_area_struct', July 1994. 7 * Fixed the shm swap deallocation (shm_unuse()), August 1998 Andrea Arcangeli. 8 * --- 648 unchanged lines hidden (view full) --- 657 .fsync = shm_fsync, 658 .release = shm_release, 659 .get_unmapped_area = shm_get_unmapped_area, 660 .llseek = noop_llseek, 661 .fallocate = shm_fallocate, 662}; 663 664/* |
| 665 * shm_file_operations_huge is now identical to shm_file_operations, 666 * but we keep it distinct for the sake of is_file_shm_hugepages(). | 665 * shm_file_operations_huge is now identical to shm_file_operations 666 * except for fop_flags |
| 667 */ 668static const struct file_operations shm_file_operations_huge = { 669 .mmap = shm_mmap, 670 .fsync = shm_fsync, 671 .release = shm_release, 672 .get_unmapped_area = shm_get_unmapped_area, 673 .llseek = noop_llseek, 674 .fallocate = shm_fallocate, | 667 */ 668static const struct file_operations shm_file_operations_huge = { 669 .mmap = shm_mmap, 670 .fsync = shm_fsync, 671 .release = shm_release, 672 .get_unmapped_area = shm_get_unmapped_area, 673 .llseek = noop_llseek, 674 .fallocate = shm_fallocate, |
| 675 .fop_flags = FOP_HUGE_PAGES, |
|
| 675}; 676 | 676}; 677 |
| 677bool is_file_shm_hugepages(struct file *file) 678{ 679 return file->f_op == &shm_file_operations_huge; 680} 681 | |
| 682static const struct vm_operations_struct shm_vm_ops = { 683 .open = shm_open, /* callback for a new vm-area open */ 684 .close = shm_close, /* callback for when the vm-area is released */ 685 .fault = shm_fault, 686 .may_split = shm_may_split, 687 .pagesize = shm_pagesize, 688#if defined(CONFIG_NUMA) 689 .set_policy = shm_set_policy, --- 1087 unchanged lines hidden (view full) --- 1777 /* 1778 * Record the file of the shm segment being 1779 * unmapped. With mremap(), someone could place 1780 * page from another segment but with equal offsets 1781 * in the range we are unmapping. 1782 */ 1783 file = vma->vm_file; 1784 size = i_size_read(file_inode(vma->vm_file)); | 678static const struct vm_operations_struct shm_vm_ops = { 679 .open = shm_open, /* callback for a new vm-area open */ 680 .close = shm_close, /* callback for when the vm-area is released */ 681 .fault = shm_fault, 682 .may_split = shm_may_split, 683 .pagesize = shm_pagesize, 684#if defined(CONFIG_NUMA) 685 .set_policy = shm_set_policy, --- 1087 unchanged lines hidden (view full) --- 1773 /* 1774 * Record the file of the shm segment being 1775 * unmapped. With mremap(), someone could place 1776 * page from another segment but with equal offsets 1777 * in the range we are unmapping. 1778 */ 1779 file = vma->vm_file; 1780 size = i_size_read(file_inode(vma->vm_file)); |
| 1785 do_vma_munmap(&vmi, vma, vma->vm_start, vma->vm_end, 1786 NULL, false); | 1781 do_vmi_align_munmap(&vmi, vma, mm, vma->vm_start, 1782 vma->vm_end, NULL, false); |
| 1787 /* 1788 * We discovered the size of the shm segment, so 1789 * break out of here and fall through to the next 1790 * loop that uses the size information to stop 1791 * searching for matching vma's. 1792 */ 1793 retval = 0; 1794 vma = vma_next(&vmi); --- 7 unchanged lines hidden (view full) --- 1802 * prevent overflows and make comparisons vs. equal-width types. 1803 */ 1804 size = PAGE_ALIGN(size); 1805 while (vma && (loff_t)(vma->vm_end - addr) <= size) { 1806 /* finding a matching vma now does not alter retval */ 1807 if ((vma->vm_ops == &shm_vm_ops) && 1808 ((vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) && 1809 (vma->vm_file == file)) { | 1783 /* 1784 * We discovered the size of the shm segment, so 1785 * break out of here and fall through to the next 1786 * loop that uses the size information to stop 1787 * searching for matching vma's. 1788 */ 1789 retval = 0; 1790 vma = vma_next(&vmi); --- 7 unchanged lines hidden (view full) --- 1798 * prevent overflows and make comparisons vs. equal-width types. 1799 */ 1800 size = PAGE_ALIGN(size); 1801 while (vma && (loff_t)(vma->vm_end - addr) <= size) { 1802 /* finding a matching vma now does not alter retval */ 1803 if ((vma->vm_ops == &shm_vm_ops) && 1804 ((vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) && 1805 (vma->vm_file == file)) { |
| 1810 do_vma_munmap(&vmi, vma, vma->vm_start, vma->vm_end, 1811 NULL, false); | 1806 do_vmi_align_munmap(&vmi, vma, mm, vma->vm_start, 1807 vma->vm_end, NULL, false); |
| 1812 } 1813 1814 vma = vma_next(&vmi); 1815 } 1816 1817#else /* CONFIG_MMU */ 1818 vma = vma_lookup(mm, addr); 1819 /* under NOMMU conditions, the exact address to be destroyed must be --- 60 unchanged lines hidden --- | 1808 } 1809 1810 vma = vma_next(&vmi); 1811 } 1812 1813#else /* CONFIG_MMU */ 1814 vma = vma_lookup(mm, addr); 1815 /* under NOMMU conditions, the exact address to be destroyed must be --- 60 unchanged lines hidden --- |