~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/fs/nilfs2/file.c

Version: ~ [ linux-5.10-rc1 ] ~ [ linux-5.9.1 ] ~ [ linux-5.8.16 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.72 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.152 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.202 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.240 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.240 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * file.c - NILFS regular file handling primitives including fsync().
  3  *
  4  * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License as published by
  8  * the Free Software Foundation; either version 2 of the License, or
  9  * (at your option) any later version.
 10  *
 11  * This program is distributed in the hope that it will be useful,
 12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  * GNU General Public License for more details.
 15  *
 16  * Written by Amagai Yoshiji and Ryusuke Konishi.
 17  */
 18 
 19 #include <linux/fs.h>
 20 #include <linux/mm.h>
 21 #include <linux/writeback.h>
 22 #include "nilfs.h"
 23 #include "segment.h"
 24 
 25 int nilfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
 26 {
 27         /*
 28          * Called from fsync() system call
 29          * This is the only entry point that can catch write and synch
 30          * timing for both data blocks and intermediate blocks.
 31          *
 32          * This function should be implemented when the writeback function
 33          * will be implemented.
 34          */
 35         struct the_nilfs *nilfs;
 36         struct inode *inode = file->f_mapping->host;
 37         int err = 0;
 38 
 39         if (nilfs_inode_dirty(inode)) {
 40                 if (datasync)
 41                         err = nilfs_construct_dsync_segment(inode->i_sb, inode,
 42                                                             start, end);
 43                 else
 44                         err = nilfs_construct_segment(inode->i_sb);
 45         }
 46 
 47         nilfs = inode->i_sb->s_fs_info;
 48         if (!err)
 49                 err = nilfs_flush_device(nilfs);
 50 
 51         return err;
 52 }
 53 
 54 static int nilfs_page_mkwrite(struct vm_fault *vmf)
 55 {
 56         struct vm_area_struct *vma = vmf->vma;
 57         struct page *page = vmf->page;
 58         struct inode *inode = file_inode(vma->vm_file);
 59         struct nilfs_transaction_info ti;
 60         int ret = 0;
 61 
 62         if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info)))
 63                 return VM_FAULT_SIGBUS; /* -ENOSPC */
 64 
 65         sb_start_pagefault(inode->i_sb);
 66         lock_page(page);
 67         if (page->mapping != inode->i_mapping ||
 68             page_offset(page) >= i_size_read(inode) || !PageUptodate(page)) {
 69                 unlock_page(page);
 70                 ret = -EFAULT;  /* make the VM retry the fault */
 71                 goto out;
 72         }
 73 
 74         /*
 75          * check to see if the page is mapped already (no holes)
 76          */
 77         if (PageMappedToDisk(page))
 78                 goto mapped;
 79 
 80         if (page_has_buffers(page)) {
 81                 struct buffer_head *bh, *head;
 82                 int fully_mapped = 1;
 83 
 84                 bh = head = page_buffers(page);
 85                 do {
 86                         if (!buffer_mapped(bh)) {
 87                                 fully_mapped = 0;
 88                                 break;
 89                         }
 90                 } while (bh = bh->b_this_page, bh != head);
 91 
 92                 if (fully_mapped) {
 93                         SetPageMappedToDisk(page);
 94                         goto mapped;
 95                 }
 96         }
 97         unlock_page(page);
 98 
 99         /*
100          * fill hole blocks
101          */
102         ret = nilfs_transaction_begin(inode->i_sb, &ti, 1);
103         /* never returns -ENOMEM, but may return -ENOSPC */
104         if (unlikely(ret))
105                 goto out;
106 
107         file_update_time(vma->vm_file);
108         ret = block_page_mkwrite(vma, vmf, nilfs_get_block);
109         if (ret) {
110                 nilfs_transaction_abort(inode->i_sb);
111                 goto out;
112         }
113         nilfs_set_file_dirty(inode, 1 << (PAGE_SHIFT - inode->i_blkbits));
114         nilfs_transaction_commit(inode->i_sb);
115 
116  mapped:
117         wait_for_stable_page(page);
118  out:
119         sb_end_pagefault(inode->i_sb);
120         return block_page_mkwrite_return(ret);
121 }
122 
123 static const struct vm_operations_struct nilfs_file_vm_ops = {
124         .fault          = filemap_fault,
125         .map_pages      = filemap_map_pages,
126         .page_mkwrite   = nilfs_page_mkwrite,
127 };
128 
129 static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma)
130 {
131         file_accessed(file);
132         vma->vm_ops = &nilfs_file_vm_ops;
133         return 0;
134 }
135 
136 /*
137  * We have mostly NULL's here: the current defaults are ok for
138  * the nilfs filesystem.
139  */
140 const struct file_operations nilfs_file_operations = {
141         .llseek         = generic_file_llseek,
142         .read_iter      = generic_file_read_iter,
143         .write_iter     = generic_file_write_iter,
144         .unlocked_ioctl = nilfs_ioctl,
145 #ifdef CONFIG_COMPAT
146         .compat_ioctl   = nilfs_compat_ioctl,
147 #endif  /* CONFIG_COMPAT */
148         .mmap           = nilfs_file_mmap,
149         .open           = generic_file_open,
150         /* .release     = nilfs_release_file, */
151         .fsync          = nilfs_sync_file,
152         .splice_read    = generic_file_splice_read,
153 };
154 
155 const struct inode_operations nilfs_file_inode_operations = {
156         .setattr        = nilfs_setattr,
157         .permission     = nilfs_permission,
158         .fiemap         = nilfs_fiemap,
159 };
160 
161 /* end of file */
162 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp