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orangefs: add orangefs_revalidate_mapping

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This is modeled after NFS, except our method is different.  We use a
simple timer to determine whether to invalidate the page cache.  This
is bound to perform.

This addes a sysfs parameter cache_timeout_msecs which controls the time
between page cache invalidations.

Signed-off-by: Martin Brandenburg <martin@omnibond.com>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
This commit is contained in:
Martin Brandenburg
2019-02-12 20:19:06 +00:00
committed by Mike Marshall
parent c472ebc255
commit 8f04e1be78
5 changed files with 328 additions and 19 deletions
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70
fs/orangefs/file.c
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@@ -241,18 +241,78 @@ out:
return ret;
}
int orangefs_revalidate_mapping(struct inode *inode)
{
struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
struct address_space *mapping = inode->i_mapping;
unsigned long *bitlock = &orangefs_inode->bitlock;
int ret;
while (1) {
ret = wait_on_bit(bitlock, 1, TASK_KILLABLE);
if (ret)
return ret;
spin_lock(&inode->i_lock);
if (test_bit(1, bitlock)) {
spin_unlock(&inode->i_lock);
continue;
}
if (!time_before(jiffies, orangefs_inode->mapping_time))
break;
spin_unlock(&inode->i_lock);
return 0;
}
set_bit(1, bitlock);
smp_wmb();
spin_unlock(&inode->i_lock);
unmap_mapping_range(mapping, 0, 0, 0);
ret = filemap_write_and_wait(mapping);
if (!ret)
ret = invalidate_inode_pages2(mapping);
orangefs_inode->mapping_time = jiffies +
orangefs_cache_timeout_msecs*HZ/1000;
clear_bit(1, bitlock);
smp_mb__after_atomic();
wake_up_bit(bitlock, 1);
return ret;
}
static ssize_t orangefs_file_read_iter(struct kiocb *iocb,
struct iov_iter *iter)
{
int ret;
orangefs_stats.reads++;
return generic_file_read_iter(iocb, iter);
down_read(&file_inode(iocb->ki_filp)->i_rwsem);
ret = orangefs_revalidate_mapping(file_inode(iocb->ki_filp));
if (ret)
goto out;
ret = generic_file_read_iter(iocb, iter);
out:
up_read(&file_inode(iocb->ki_filp)->i_rwsem);
return ret;
}
static ssize_t orangefs_file_write_iter(struct kiocb *iocb,
struct iov_iter *iter)
{
int ret;
orangefs_stats.writes++;
return generic_file_write_iter(iocb, iter);
if (iocb->ki_pos > i_size_read(file_inode(iocb->ki_filp))) {
ret = orangefs_revalidate_mapping(file_inode(iocb->ki_filp));
if (ret)
return ret;
}
ret = generic_file_write_iter(iocb, iter);
return ret;
}
/*
@@ -341,6 +401,12 @@ static const struct vm_operations_struct orangefs_file_vm_ops = {
*/
static int orangefs_file_mmap(struct file *file, struct vm_area_struct *vma)
{
int ret;
ret = orangefs_revalidate_mapping(file_inode(file));
if (ret)
return ret;
gossip_debug(GOSSIP_FILE_DEBUG,
"orangefs_file_mmap: called on %s\n",
(file ?