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![Josef Bacik](/assets/img/avatar_default.png)
Btrfs needs to be able to control how filemap_write_and_wait_range() is called in fsync to make it less of a painful operation, so push down taking i_mutex and the calling of filemap_write_and_wait() down into the ->fsync() handlers. Some file systems can drop taking the i_mutex altogether it seems, like ext3 and ocfs2. For correctness sake I just pushed everything down in all cases to make sure that we keep the current behavior the same for everybody, and then each individual fs maintainer can make up their mind about what to do from there. Thanks, Acked-by: Jan Kara <jack@suse.cz> Signed-off-by: Josef Bacik <josef@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
171 lines
4.2 KiB
C
171 lines
4.2 KiB
C
/*
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* linux/fs/hpfs/file.c
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*
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* Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
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*
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* file VFS functions
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*/
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#include "hpfs_fn.h"
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#define BLOCKS(size) (((size) + 511) >> 9)
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static int hpfs_file_release(struct inode *inode, struct file *file)
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{
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hpfs_lock(inode->i_sb);
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hpfs_write_if_changed(inode);
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hpfs_unlock(inode->i_sb);
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return 0;
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}
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int hpfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
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{
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struct inode *inode = file->f_mapping->host;
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int ret;
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ret = filemap_write_and_wait_range(file->f_mapping, start, end);
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if (ret)
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return ret;
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return sync_blockdev(inode->i_sb->s_bdev);
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}
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/*
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* generic_file_read often calls bmap with non-existing sector,
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* so we must ignore such errors.
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*/
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static secno hpfs_bmap(struct inode *inode, unsigned file_secno)
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{
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struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
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unsigned n, disk_secno;
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struct fnode *fnode;
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struct buffer_head *bh;
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if (BLOCKS(hpfs_i(inode)->mmu_private) <= file_secno) return 0;
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n = file_secno - hpfs_inode->i_file_sec;
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if (n < hpfs_inode->i_n_secs) return hpfs_inode->i_disk_sec + n;
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if (!(fnode = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) return 0;
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disk_secno = hpfs_bplus_lookup(inode->i_sb, inode, &fnode->btree, file_secno, bh);
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if (disk_secno == -1) return 0;
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if (hpfs_chk_sectors(inode->i_sb, disk_secno, 1, "bmap")) return 0;
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return disk_secno;
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}
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static void hpfs_truncate(struct inode *i)
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{
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if (IS_IMMUTABLE(i)) return /*-EPERM*/;
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hpfs_lock_assert(i->i_sb);
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hpfs_i(i)->i_n_secs = 0;
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i->i_blocks = 1 + ((i->i_size + 511) >> 9);
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hpfs_i(i)->mmu_private = i->i_size;
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hpfs_truncate_btree(i->i_sb, i->i_ino, 1, ((i->i_size + 511) >> 9));
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hpfs_write_inode(i);
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hpfs_i(i)->i_n_secs = 0;
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}
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static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create)
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{
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int r;
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secno s;
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hpfs_lock(inode->i_sb);
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s = hpfs_bmap(inode, iblock);
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if (s) {
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map_bh(bh_result, inode->i_sb, s);
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goto ret_0;
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}
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if (!create) goto ret_0;
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if (iblock<<9 != hpfs_i(inode)->mmu_private) {
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BUG();
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r = -EIO;
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goto ret_r;
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}
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if ((s = hpfs_add_sector_to_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1)) == -1) {
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hpfs_truncate_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1);
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r = -ENOSPC;
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goto ret_r;
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}
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inode->i_blocks++;
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hpfs_i(inode)->mmu_private += 512;
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set_buffer_new(bh_result);
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map_bh(bh_result, inode->i_sb, s);
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ret_0:
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r = 0;
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ret_r:
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hpfs_unlock(inode->i_sb);
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return r;
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}
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static int hpfs_writepage(struct page *page, struct writeback_control *wbc)
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{
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return block_write_full_page(page,hpfs_get_block, wbc);
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}
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static int hpfs_readpage(struct file *file, struct page *page)
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{
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return block_read_full_page(page,hpfs_get_block);
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}
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static int hpfs_write_begin(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned flags,
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struct page **pagep, void **fsdata)
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{
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int ret;
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*pagep = NULL;
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ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
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hpfs_get_block,
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&hpfs_i(mapping->host)->mmu_private);
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if (unlikely(ret)) {
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loff_t isize = mapping->host->i_size;
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if (pos + len > isize)
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vmtruncate(mapping->host, isize);
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}
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return ret;
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}
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static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block)
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{
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return generic_block_bmap(mapping,block,hpfs_get_block);
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}
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const struct address_space_operations hpfs_aops = {
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.readpage = hpfs_readpage,
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.writepage = hpfs_writepage,
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.write_begin = hpfs_write_begin,
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.write_end = generic_write_end,
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.bmap = _hpfs_bmap
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};
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static ssize_t hpfs_file_write(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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ssize_t retval;
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retval = do_sync_write(file, buf, count, ppos);
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if (retval > 0) {
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hpfs_lock(file->f_path.dentry->d_sb);
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hpfs_i(file->f_path.dentry->d_inode)->i_dirty = 1;
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hpfs_unlock(file->f_path.dentry->d_sb);
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}
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return retval;
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}
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const struct file_operations hpfs_file_ops =
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{
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.llseek = generic_file_llseek,
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.read = do_sync_read,
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.aio_read = generic_file_aio_read,
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.write = hpfs_file_write,
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.aio_write = generic_file_aio_write,
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.mmap = generic_file_mmap,
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.release = hpfs_file_release,
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.fsync = hpfs_file_fsync,
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.splice_read = generic_file_splice_read,
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};
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const struct inode_operations hpfs_file_iops =
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{
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.truncate = hpfs_truncate,
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.setattr = hpfs_setattr,
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};
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