^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * file.c - NILFS regular file handling primitives including fsync().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Written by Amagai Yoshiji and Ryusuke Konishi.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/writeback.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include "nilfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include "segment.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) int nilfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * Called from fsync() system call
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * This is the only entry point that can catch write and synch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * timing for both data blocks and intermediate blocks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * This function should be implemented when the writeback function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * will be implemented.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct the_nilfs *nilfs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct inode *inode = file->f_mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) if (nilfs_inode_dirty(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) if (datasync)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) err = nilfs_construct_dsync_segment(inode->i_sb, inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) start, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) err = nilfs_construct_segment(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) nilfs = inode->i_sb->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) err = nilfs_flush_device(nilfs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) static vm_fault_t nilfs_page_mkwrite(struct vm_fault *vmf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) struct vm_area_struct *vma = vmf->vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) struct page *page = vmf->page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct inode *inode = file_inode(vma->vm_file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct nilfs_transaction_info ti;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) return VM_FAULT_SIGBUS; /* -ENOSPC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) sb_start_pagefault(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) lock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) if (page->mapping != inode->i_mapping ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) page_offset(page) >= i_size_read(inode) || !PageUptodate(page)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) ret = -EFAULT; /* make the VM retry the fault */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * check to see if the page is mapped already (no holes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) if (PageMappedToDisk(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) goto mapped;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (page_has_buffers(page)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) struct buffer_head *bh, *head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) int fully_mapped = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) bh = head = page_buffers(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (!buffer_mapped(bh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) fully_mapped = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) } while (bh = bh->b_this_page, bh != head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) if (fully_mapped) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) SetPageMappedToDisk(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) goto mapped;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * fill hole blocks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) ret = nilfs_transaction_begin(inode->i_sb, &ti, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) /* never returns -ENOMEM, but may return -ENOSPC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (unlikely(ret))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) file_update_time(vma->vm_file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) ret = block_page_mkwrite(vma, vmf, nilfs_get_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) nilfs_transaction_abort(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) nilfs_set_file_dirty(inode, 1 << (PAGE_SHIFT - inode->i_blkbits));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) nilfs_transaction_commit(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) mapped:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) wait_for_stable_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) sb_end_pagefault(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return block_page_mkwrite_return(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static const struct vm_operations_struct nilfs_file_vm_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) .fault = filemap_fault,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) .map_pages = filemap_map_pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) .page_mkwrite = nilfs_page_mkwrite,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) file_accessed(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) vma->vm_ops = &nilfs_file_vm_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) * We have mostly NULL's here: the current defaults are ok for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) * the nilfs filesystem.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) const struct file_operations nilfs_file_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) .llseek = generic_file_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) .read_iter = generic_file_read_iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) .write_iter = generic_file_write_iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) .unlocked_ioctl = nilfs_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) .compat_ioctl = nilfs_compat_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) #endif /* CONFIG_COMPAT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) .mmap = nilfs_file_mmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) .open = generic_file_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) /* .release = nilfs_release_file, */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) .fsync = nilfs_sync_file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) .splice_read = generic_file_splice_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) .splice_write = iter_file_splice_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) const struct inode_operations nilfs_file_inode_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) .setattr = nilfs_setattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) .permission = nilfs_permission,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) .fiemap = nilfs_fiemap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) /* end of file */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags