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SubjectRe: [PATCH 2/2][RFC][BUG] msync: updating ctime and mtime at syncing
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On Fri, 2008-01-11 at 03:44 +0300, Anton Salikhmetov wrote:

> +/*
> + * Update the ctime and mtime stamps after checking if they are to be updated.
> + */
> +void mapped_file_update_time(struct file *file)
> +{
> + if (test_and_clear_bit(AS_MCTIME, &file->f_mapping->flags)) {
> + get_file(file);
> + file_update_time(file);
> + fput(file);
> + }
> +}
> +

I don't think you need the get/put file stuff here, because

> @@ -87,6 +87,8 @@ long do_fsync(struct file *file, int datasync)
> goto out;
> }
>
> + mapped_file_update_time(file);
> +
> ret = filemap_fdatawrite(mapping);
>
> /*

at this call-site we already hold an extra reference on the file, and

> @@ -74,14 +79,17 @@ asmlinkage long sys_msync(unsigned long start, size_t len, int flags)
> break;
> }
> file = vma->vm_file;
> - if ((flags & MS_SYNC) && file && (vma->vm_flags & VM_SHARED)) {
> - get_file(file);
> - up_read(&mm->mmap_sem);
> - error = do_fsync(file, 0);
> - fput(file);
> - if (error)
> - return error;
> - down_read(&mm->mmap_sem);
> + if (file && (vma->vm_flags & VM_SHARED)) {
> + mapped_file_update_time(file);
> + if (flags & MS_SYNC) {
> + get_file(file);
> + up_read(&mm->mmap_sem);
> + error = do_fsync(file, 0);
> + fput(file);
> + if (error)
> + return error;
> + down_read(&mm->mmap_sem);
> + }
> }
>
> start = vma->vm_end;

here we hold the mmap_sem so the vma reference on the file can't go
away.



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