1 files changed, 140 insertions, 0 deletions

diff --git a/fs/hpfs/file.c b/fs/hpfs/file.c
new file mode 100644
index 000000000000..ab144dabd870
--- /dev/null
+++ b/fs/hpfs/file.c
@@ -0,0 +1,140 @@
+/*
+ *  linux/fs/hpfs/file.c
+ *
+ *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
+ *
+ *  file VFS functions
+ */
+
+#include "hpfs_fn.h"
+
+#define BLOCKS(size) (((size) + 511) >> 9)
+
+static int hpfs_file_release(struct inode *inode, struct file *file)
+{
+        lock_kernel();
+        hpfs_write_if_changed(inode);
+        unlock_kernel();
+        return 0;
+}
+
+int hpfs_file_fsync(struct file *file, struct dentry *dentry, int datasync)
+{
+        /*return file_fsync(file, dentry);*/
+        return 0; /* Don't fsync :-) */
+}
+
+/*
+ * generic_file_read often calls bmap with non-existing sector,
+ * so we must ignore such errors.
+ */
+
+static secno hpfs_bmap(struct inode *inode, unsigned file_secno)
+{
+        struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
+        unsigned n, disk_secno;
+        struct fnode *fnode;
+        struct buffer_head *bh;
+        if (BLOCKS(hpfs_i(inode)->mmu_private) <= file_secno) return 0;
+        n = file_secno - hpfs_inode->i_file_sec;
+        if (n < hpfs_inode->i_n_secs) return hpfs_inode->i_disk_sec + n;
+        if (!(fnode = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) return 0;
+        disk_secno = hpfs_bplus_lookup(inode->i_sb, inode, &fnode->btree, file_secno, bh);
+        if (disk_secno == -1) return 0;
+        if (hpfs_chk_sectors(inode->i_sb, disk_secno, 1, "bmap")) return 0;
+        return disk_secno;
+}
+
+static void hpfs_truncate(struct inode *i)
+{
+        if (IS_IMMUTABLE(i)) return /*-EPERM*/;
+        lock_kernel();
+        hpfs_i(i)->i_n_secs = 0;
+        i->i_blocks = 1 + ((i->i_size + 511) >> 9);
+        hpfs_i(i)->mmu_private = i->i_size;
+        hpfs_truncate_btree(i->i_sb, i->i_ino, 1, ((i->i_size + 511) >> 9));
+        hpfs_write_inode(i);
+        hpfs_i(i)->i_n_secs = 0;
+        unlock_kernel();
+}
+
+static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create)
+{
+        secno s;
+        s = hpfs_bmap(inode, iblock);
+        if (s) {
+                map_bh(bh_result, inode->i_sb, s);
+                return 0;
+        }
+        if (!create) return 0;
+        if (iblock<<9 != hpfs_i(inode)->mmu_private) {
+                BUG();
+                return -EIO;
+        }
+        if ((s = hpfs_add_sector_to_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1)) == -1) {
+                hpfs_truncate_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1);
+                return -ENOSPC;
+        }
+        inode->i_blocks++;
+        hpfs_i(inode)->mmu_private += 512;
+        set_buffer_new(bh_result);
+        map_bh(bh_result, inode->i_sb, s);
+        return 0;
+}
+
+static int hpfs_writepage(struct page *page, struct writeback_control *wbc)
+{
+        return block_write_full_page(page,hpfs_get_block, wbc);
+}
+static int hpfs_readpage(struct file *file, struct page *page)
+{
+        return block_read_full_page(page,hpfs_get_block);
+}
+static int hpfs_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
+{
+        return cont_prepare_write(page,from,to,hpfs_get_block,
+                &hpfs_i(page->mapping->host)->mmu_private);
+}
+static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block)
+{
+        return generic_block_bmap(mapping,block,hpfs_get_block);
+}
+struct address_space_operations hpfs_aops = {
+        .readpage = hpfs_readpage,
+        .writepage = hpfs_writepage,
+        .sync_page = block_sync_page,
+        .prepare_write = hpfs_prepare_write,
+        .commit_write = generic_commit_write,
+        .bmap = _hpfs_bmap
+};
+
+static ssize_t hpfs_file_write(struct file *file, const char __user *buf,
+                        size_t count, loff_t *ppos)
+{
+        ssize_t retval;
+
+        retval = generic_file_write(file, buf, count, ppos);
+        if (retval > 0) {
+                struct inode *inode = file->f_dentry->d_inode;
+                inode->i_mtime = CURRENT_TIME_SEC;
+                hpfs_i(inode)->i_dirty = 1;
+        }
+        return retval;
+}
+
+struct file_operations hpfs_file_ops =
+{
+        .llseek         = generic_file_llseek,
+        .read           = generic_file_read,
+        .write          = hpfs_file_write,
+        .mmap           = generic_file_mmap,
+        .release        = hpfs_file_release,
+        .fsync          = hpfs_file_fsync,
+        .sendfile       = generic_file_sendfile,
+};
+
+struct inode_operations hpfs_file_iops =
+{
+        .truncate       = hpfs_truncate,
+        .setattr        = hpfs_notify_change,
+};