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um: hostfs: Fix writeback 

We have to implement ->release() and trigger writeback from it.
Otherwise we might lose dirty pages at munmap().

Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Richard Weinberger 2013-08-04 17:23:51 +00:00
parent 6e4664525b
commit 65984ff9d2
1 changed files with 8 additions and 1 deletions
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9
fs/hostfs/hostfs_kern.c
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@ -361,6 +361,13 @@ int hostfs_file_open(struct inode *ino, struct file *file)
return 0;
}
static int hostfs_file_release(struct inode *inode, struct file *file)
{
filemap_write_and_wait(inode->i_mapping);
return 0;
}
int hostfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
{
struct inode *inode = file->f_mapping->host;
@ -386,7 +393,7 @@ static const struct file_operations hostfs_file_fops = {
.write = do_sync_write,
.mmap = generic_file_mmap,
.open = hostfs_file_open,
.release = NULL,
.release = hostfs_file_release,
.fsync = hostfs_fsync,
};