4 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
9 #include <linux/string.h>
10 #include <linux/sched.h>
11 #include <linux/smp_lock.h>
14 #define BLOCKS(size) (((size) + 511) >> 9)
17 int hpfs_open(struct inode *i, struct file *f)
21 hpfs_unlock_inode(i); /* make sure nobody is deleting the file */
23 if (!i->i_nlink) return -ENOENT;
27 int hpfs_file_release(struct inode *inode, struct file *file)
30 hpfs_write_if_changed(inode);
35 int hpfs_file_fsync(struct file *file, struct dentry *dentry, int datasync)
37 /*return file_fsync(file, dentry);*/
38 return 0; /* Don't fsync :-) */
42 * generic_file_read often calls bmap with non-existing sector,
43 * so we must ignore such errors.
46 secno hpfs_bmap(struct inode *inode, unsigned file_secno)
48 unsigned n, disk_secno;
50 struct buffer_head *bh;
51 if (BLOCKS(inode->u.hpfs_i.mmu_private) <= file_secno) return 0;
52 n = file_secno - inode->i_hpfs_file_sec;
53 if (n < inode->i_hpfs_n_secs) return inode->i_hpfs_disk_sec + n;
54 if (!(fnode = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) return 0;
55 disk_secno = hpfs_bplus_lookup(inode->i_sb, inode, &fnode->btree, file_secno, bh);
56 if (disk_secno == -1) return 0;
57 if (hpfs_chk_sectors(inode->i_sb, disk_secno, 1, "bmap")) return 0;
61 void hpfs_truncate(struct inode *i)
63 if (IS_IMMUTABLE(i)) return /*-EPERM*/;
65 i->i_blocks = 1 + ((i->i_size + 511) >> 9);
66 i->u.hpfs_i.mmu_private = i->i_size;
67 hpfs_truncate_btree(i->i_sb, i->i_ino, 1, ((i->i_size + 511) >> 9));
71 int hpfs_get_block(struct inode *inode, long iblock, struct buffer_head *bh_result, int create)
74 s = hpfs_bmap(inode, iblock);
76 bh_result->b_dev = inode->i_dev;
77 bh_result->b_blocknr = s;
78 bh_result->b_state |= (1UL << BH_Mapped);
81 if (!create) return 0;
82 if (iblock<<9 != inode->u.hpfs_i.mmu_private) {
86 if ((s = hpfs_add_sector_to_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1)) == -1) {
87 hpfs_truncate_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1);
91 inode->u.hpfs_i.mmu_private += 512;
92 bh_result->b_dev = inode->i_dev;
93 bh_result->b_blocknr = s;
94 bh_result->b_state |= (1UL << BH_Mapped) | (1UL << BH_New);
98 static int hpfs_writepage(struct page *page)
100 return block_write_full_page(page,hpfs_get_block);
102 static int hpfs_readpage(struct file *file, struct page *page)
104 return block_read_full_page(page,hpfs_get_block);
106 static int hpfs_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
108 return cont_prepare_write(page,from,to,hpfs_get_block,
109 &page->mapping->host->u.hpfs_i.mmu_private);
111 static int _hpfs_bmap(struct address_space *mapping, long block)
113 return generic_block_bmap(mapping,block,hpfs_get_block);
115 struct address_space_operations hpfs_aops = {
116 readpage: hpfs_readpage,
117 writepage: hpfs_writepage,
118 sync_page: block_sync_page,
119 prepare_write: hpfs_prepare_write,
120 commit_write: generic_commit_write,
124 ssize_t hpfs_file_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
128 retval = generic_file_write(file, buf, count, ppos);
130 struct inode *inode = file->f_dentry->d_inode;
131 inode->i_mtime = CURRENT_TIME;
132 inode->i_hpfs_dirty = 1;