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generated by cgit v1.2.2 (git 2.25.0) at 2025-03-02 09:48:52 -0500
pan> unsigned long start, unsigned long end) { *prev = vma; if (vma->vm_flags & (VM_LOCKED|VM_HUGETLB|VM_PFNMAP)) return -EINVAL; if (unlikely(vma->vm_flags & VM_NONLINEAR)) { struct zap_details details = { .nonlinear_vma = vma, .last_index = ULONG_MAX, }; zap_page_range(vma, start, end - start, &details); } else zap_page_range(vma, start, end - start, NULL); return 0; } /* * Application wants to free up the pages and associated backing store. * This is effectively punching a hole into the middle of a file. * * NOTE: Currently, only shmfs/tmpfs is supported for this operation. * Other filesystems return -ENOSYS. */ static long madvise_remove(struct vm_area_struct *vma, struct vm_area_struct **prev, unsigned long start, unsigned long end) { struct address_space *mapping; loff_t offset, endoff; int error; *prev = NULL; /* tell sys_madvise we drop mmap_sem */ if (vma->vm_flags & (VM_LOCKED|VM_NONLINEAR|VM_HUGETLB)) return -EINVAL; if (!vma->vm_file || !vma->vm_file->f_mapping || !vma->vm_file->f_mapping->host) { return -EINVAL; } if ((vma->vm_flags & (VM_SHARED|VM_WRITE)) != (VM_SHARED|VM_WRITE)) return -EACCES; mapping = vma->vm_file->f_mapping; offset = (loff_t)(start - vma->vm_start) + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); endoff = (loff_t)(end - vma->vm_start - 1) + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); /* vmtruncate_range needs to take i_mutex and i_alloc_sem */ up_read(&current->mm->mmap_sem); error = vmtruncate_range(mapping->host, offset, endoff); down_read(&current->mm->mmap_sem); return error; } static long madvise_vma(struct vm_area_struct *vma, struct vm_area_struct **prev, unsigned long start, unsigned long end, int behavior) { long error; switch (behavior) { case MADV_DOFORK: if (vma->vm_flags & VM_IO) { error = -EINVAL; break; } case MADV_DONTFORK: case MADV_NORMAL: case MADV_SEQUENTIAL: case MADV_RANDOM: error = madvise_behavior(vma, prev, start, end, behavior); break; case MADV_REMOVE: error = madvise_remove(vma, prev, start, end); break; case MADV_WILLNEED: error = madvise_willneed(vma, prev, start, end); break; case MADV_DONTNEED: error = madvise_dontneed(vma, prev, start, end); break; default: BUG(); break; } return error; } static int madvise_behavior_valid(int behavior) { switch (behavior) { case MADV_DOFORK: case MADV_DONTFORK: case MADV_NORMAL: case MADV_SEQUENTIAL: case MADV_RANDOM: case MADV_REMOVE: case MADV_WILLNEED: case MADV_DONTNEED: return 1; default: return 0; } } /* * The madvise(2) system call. * * Applications can use madvise() to advise the kernel how it should * handle paging I/O in this VM area. The idea is to help the kernel * use appropriate read-ahead and caching techniques. The information * provided is advisory only, and can be safely disregarded by the * kernel without affecting the correct operation of the application. * * behavior values: * MADV_NORMAL - the default behavior is to read clusters. This * results in some read-ahead and read-behind. * MADV_RANDOM - the system should read the minimum amount of data * on any access, since it is unlikely that the appli- * cation will need more than what it asks for. * MADV_SEQUENTIAL - pages in the given range will probably be accessed * once, so they can be aggressively read ahead, and * can be freed soon after they are accessed. * MADV_WILLNEED - the application is notifying the system to read * some pages ahead. * MADV_DONTNEED - the application is finished with the given range, * so the kernel can free resources associated with it. * MADV_REMOVE - the application wants to free up the given range of * pages and associated backing store. * * return values: * zero - success * -EINVAL - start + len < 0, start is not page-aligned, * "behavior" is not a valid value, or application * is attempting to release locked or shared pages. * -ENOMEM - addresses in the specified range are not currently * mapped, or are outside the AS of the process. * -EIO - an I/O error occurred while paging in data. * -EBADF - map exists, but area maps something that isn't a file. * -EAGAIN - a kernel resource was temporarily unavailable. */ SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior) { unsigned long end, tmp; struct vm_area_struct * vma, *prev; int unmapped_error = 0; int error = -EINVAL; int write; size_t len; if (!madvise_behavior_valid(behavior)) return error; write = madvise_need_mmap_write(behavior); if (write) down_write(&current->mm->mmap_sem); else down_read(&current->mm->mmap_sem); if (start & ~PAGE_MASK) goto out; len = (len_in + ~PAGE_MASK) & PAGE_MASK; /* Check to see whether len was rounded up from small -ve to zero */ if (len_in && !len) goto out; end = start + len; if (end < start) goto out; error = 0; if (end == start) goto out; /* * If the interval [start,end) covers some unmapped address * ranges, just ignore them, but return -ENOMEM at the end. * - different from the way of handling in mlock etc. */ vma = find_vma_prev(current->mm, start, &prev); if (vma && start > vma->vm_start) prev = vma; for (;;) { /* Still start < end. */ error = -ENOMEM; if (!vma) goto out; /* Here start < (end|vma->vm_end). */ if (start < vma->vm_start) { unmapped_error = -ENOMEM; start = vma->vm_start; if (start >= end) goto out; } /* Here vma->vm_start <= start < (end|vma->vm_end) */ tmp = vma->vm_end; if (end < tmp) tmp = end; /* Here vma->vm_start <= start < tmp <= (end|vma->vm_end). */ error = madvise_vma(vma, &prev, start, tmp, behavior); if (error) goto out; start = tmp; if (prev && start < prev->vm_end) start = prev->vm_end; error = unmapped_error; if (start >= end) goto out; if (prev) vma = prev->vm_next; else /* madvise_remove dropped mmap_sem */ vma = find_vma(current->mm, start); } out: if (write) up_write(&current->mm->mmap_sem); else up_read(&current->mm->mmap_sem); return error; }
generated by cgit v1.2.2 (git 2.25.0) at 2025-03-02 09:48:52 -0500