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Linux/fs/hpfs/file.c

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  1 /*
  2  *  linux/fs/hpfs/file.c
  3  *
  4  *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
  5  *
  6  *  file VFS functions
  7  */
  8 
  9 #include "hpfs_fn.h"
 10 #include <linux/mpage.h>
 11 
 12 #define BLOCKS(size) (((size) + 511) >> 9)
 13 
 14 static int hpfs_file_release(struct inode *inode, struct file *file)
 15 {
 16         hpfs_lock(inode->i_sb);
 17         hpfs_write_if_changed(inode);
 18         hpfs_unlock(inode->i_sb);
 19         return 0;
 20 }
 21 
 22 int hpfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
 23 {
 24         struct inode *inode = file->f_mapping->host;
 25         int ret;
 26 
 27         ret = filemap_write_and_wait_range(file->f_mapping, start, end);
 28         if (ret)
 29                 return ret;
 30         return sync_blockdev(inode->i_sb->s_bdev);
 31 }
 32 
 33 /*
 34  * generic_file_read often calls bmap with non-existing sector,
 35  * so we must ignore such errors.
 36  */
 37 
 38 static secno hpfs_bmap(struct inode *inode, unsigned file_secno, unsigned *n_secs)
 39 {
 40         struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
 41         unsigned n, disk_secno;
 42         struct fnode *fnode;
 43         struct buffer_head *bh;
 44         if (BLOCKS(hpfs_i(inode)->mmu_private) <= file_secno) return 0;
 45         n = file_secno - hpfs_inode->i_file_sec;
 46         if (n < hpfs_inode->i_n_secs) {
 47                 *n_secs = hpfs_inode->i_n_secs - n;
 48                 return hpfs_inode->i_disk_sec + n;
 49         }
 50         if (!(fnode = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) return 0;
 51         disk_secno = hpfs_bplus_lookup(inode->i_sb, inode, &fnode->btree, file_secno, bh);
 52         if (disk_secno == -1) return 0;
 53         if (hpfs_chk_sectors(inode->i_sb, disk_secno, 1, "bmap")) return 0;
 54         n = file_secno - hpfs_inode->i_file_sec;
 55         if (n < hpfs_inode->i_n_secs) {
 56                 *n_secs = hpfs_inode->i_n_secs - n;
 57                 return hpfs_inode->i_disk_sec + n;
 58         }
 59         *n_secs = 1;
 60         return disk_secno;
 61 }
 62 
 63 void hpfs_truncate(struct inode *i)
 64 {
 65         if (IS_IMMUTABLE(i)) return /*-EPERM*/;
 66         hpfs_lock_assert(i->i_sb);
 67 
 68         hpfs_i(i)->i_n_secs = 0;
 69         i->i_blocks = 1 + ((i->i_size + 511) >> 9);
 70         hpfs_i(i)->mmu_private = i->i_size;
 71         hpfs_truncate_btree(i->i_sb, i->i_ino, 1, ((i->i_size + 511) >> 9));
 72         hpfs_write_inode(i);
 73         hpfs_i(i)->i_n_secs = 0;
 74 }
 75 
 76 static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create)
 77 {
 78         int r;
 79         secno s;
 80         unsigned n_secs;
 81         hpfs_lock(inode->i_sb);
 82         s = hpfs_bmap(inode, iblock, &n_secs);
 83         if (s) {
 84                 if (bh_result->b_size >> 9 < n_secs)
 85                         n_secs = bh_result->b_size >> 9;
 86                 map_bh(bh_result, inode->i_sb, s);
 87                 bh_result->b_size = n_secs << 9;
 88                 goto ret_0;
 89         }
 90         if (!create) goto ret_0;
 91         if (iblock<<9 != hpfs_i(inode)->mmu_private) {
 92                 BUG();
 93                 r = -EIO;
 94                 goto ret_r;
 95         }
 96         if ((s = hpfs_add_sector_to_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1)) == -1) {
 97                 hpfs_truncate_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1);
 98                 r = -ENOSPC;
 99                 goto ret_r;
100         }
101         inode->i_blocks++;
102         hpfs_i(inode)->mmu_private += 512;
103         set_buffer_new(bh_result);
104         map_bh(bh_result, inode->i_sb, s);
105         ret_0:
106         r = 0;
107         ret_r:
108         hpfs_unlock(inode->i_sb);
109         return r;
110 }
111 
112 static int hpfs_readpage(struct file *file, struct page *page)
113 {
114         return mpage_readpage(page, hpfs_get_block);
115 }
116 
117 static int hpfs_writepage(struct page *page, struct writeback_control *wbc)
118 {
119         return block_write_full_page(page, hpfs_get_block, wbc);
120 }
121 
122 static int hpfs_readpages(struct file *file, struct address_space *mapping,
123                           struct list_head *pages, unsigned nr_pages)
124 {
125         return mpage_readpages(mapping, pages, nr_pages, hpfs_get_block);
126 }
127 
128 static int hpfs_writepages(struct address_space *mapping,
129                            struct writeback_control *wbc)
130 {
131         return mpage_writepages(mapping, wbc, hpfs_get_block);
132 }
133 
134 static void hpfs_write_failed(struct address_space *mapping, loff_t to)
135 {
136         struct inode *inode = mapping->host;
137 
138         hpfs_lock(inode->i_sb);
139 
140         if (to > inode->i_size) {
141                 truncate_pagecache(inode, inode->i_size);
142                 hpfs_truncate(inode);
143         }
144 
145         hpfs_unlock(inode->i_sb);
146 }
147 
148 static int hpfs_write_begin(struct file *file, struct address_space *mapping,
149                         loff_t pos, unsigned len, unsigned flags,
150                         struct page **pagep, void **fsdata)
151 {
152         int ret;
153 
154         *pagep = NULL;
155         ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
156                                 hpfs_get_block,
157                                 &hpfs_i(mapping->host)->mmu_private);
158         if (unlikely(ret))
159                 hpfs_write_failed(mapping, pos + len);
160 
161         return ret;
162 }
163 
164 static int hpfs_write_end(struct file *file, struct address_space *mapping,
165                         loff_t pos, unsigned len, unsigned copied,
166                         struct page *pagep, void *fsdata)
167 {
168         struct inode *inode = mapping->host;
169         int err;
170         err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
171         if (err < len)
172                 hpfs_write_failed(mapping, pos + len);
173         if (!(err < 0)) {
174                 /* make sure we write it on close, if not earlier */
175                 hpfs_lock(inode->i_sb);
176                 hpfs_i(inode)->i_dirty = 1;
177                 hpfs_unlock(inode->i_sb);
178         }
179         return err;
180 }
181 
182 static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block)
183 {
184         return generic_block_bmap(mapping,block,hpfs_get_block);
185 }
186 
187 const struct address_space_operations hpfs_aops = {
188         .readpage = hpfs_readpage,
189         .writepage = hpfs_writepage,
190         .readpages = hpfs_readpages,
191         .writepages = hpfs_writepages,
192         .write_begin = hpfs_write_begin,
193         .write_end = hpfs_write_end,
194         .bmap = _hpfs_bmap
195 };
196 
197 const struct file_operations hpfs_file_ops =
198 {
199         .llseek         = generic_file_llseek,
200         .read           = new_sync_read,
201         .read_iter      = generic_file_read_iter,
202         .write          = new_sync_write,
203         .write_iter     = generic_file_write_iter,
204         .mmap           = generic_file_mmap,
205         .release        = hpfs_file_release,
206         .fsync          = hpfs_file_fsync,
207         .splice_read    = generic_file_splice_read,
208 };
209 
210 const struct inode_operations hpfs_file_iops =
211 {
212         .setattr        = hpfs_setattr,
213 };
214 

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