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

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