diff options
Diffstat (limited to 'fs/ceph/addr.c')
-rw-r--r-- | fs/ceph/addr.c | 89 |
1 files changed, 77 insertions, 12 deletions
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index c346b8479f9..ebda329611b 100644 --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -1210,6 +1210,41 @@ const struct address_space_operations ceph_aops = { /* * vm ops */ +static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf) +{ + struct inode *inode = file_inode(vma->vm_file); + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_file_info *fi = vma->vm_file->private_data; + loff_t off = vmf->pgoff << PAGE_CACHE_SHIFT; + int want, got, ret; + + dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", + inode, ceph_vinop(inode), off, PAGE_CACHE_SIZE); + if (fi->fmode & CEPH_FILE_MODE_LAZY) + want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; + else + want = CEPH_CAP_FILE_CACHE; + while (1) { + got = 0; + ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, &got, -1); + if (ret == 0) + break; + if (ret != -ERESTARTSYS) { + WARN_ON(1); + return VM_FAULT_SIGBUS; + } + } + dout("filemap_fault %p %llu~%zd got cap refs on %s\n", + inode, off, PAGE_CACHE_SIZE, ceph_cap_string(got)); + + ret = filemap_fault(vma, vmf); + + dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n", + inode, off, PAGE_CACHE_SIZE, ceph_cap_string(got), ret); + ceph_put_cap_refs(ci, got); + + return ret; +} /* * Reuse write_begin here for simplicity. @@ -1217,23 +1252,41 @@ const struct address_space_operations ceph_aops = { static int ceph_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) { struct inode *inode = file_inode(vma->vm_file); - struct page *page = vmf->page; + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_file_info *fi = vma->vm_file->private_data; struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; + struct page *page = vmf->page; loff_t off = page_offset(page); - loff_t size, len; - int ret; - - /* Update time before taking page lock */ - file_update_time(vma->vm_file); + loff_t size = i_size_read(inode); + size_t len; + int want, got, ret; - size = i_size_read(inode); if (off + PAGE_CACHE_SIZE <= size) len = PAGE_CACHE_SIZE; else len = size & ~PAGE_CACHE_MASK; - dout("page_mkwrite %p %llu~%llu page %p idx %lu\n", inode, - off, len, page, page->index); + dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", + inode, ceph_vinop(inode), off, len, size); + if (fi->fmode & CEPH_FILE_MODE_LAZY) + want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; + else + want = CEPH_CAP_FILE_BUFFER; + while (1) { + got = 0; + ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, off + len); + if (ret == 0) + break; + if (ret != -ERESTARTSYS) { + WARN_ON(1); + return VM_FAULT_SIGBUS; + } + } + dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", + inode, off, len, ceph_cap_string(got)); + + /* Update time before taking page lock */ + file_update_time(vma->vm_file); lock_page(page); @@ -1255,14 +1308,26 @@ static int ceph_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) ret = VM_FAULT_SIGBUS; } out: - dout("page_mkwrite %p %llu~%llu = %d\n", inode, off, len, ret); - if (ret != VM_FAULT_LOCKED) + if (ret != VM_FAULT_LOCKED) { unlock_page(page); + } else { + int dirty; + spin_lock(&ci->i_ceph_lock); + dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR); + spin_unlock(&ci->i_ceph_lock); + if (dirty) + __mark_inode_dirty(inode, dirty); + } + + dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n", + inode, off, len, ceph_cap_string(got), ret); + ceph_put_cap_refs(ci, got); + return ret; } static struct vm_operations_struct ceph_vmops = { - .fault = filemap_fault, + .fault = ceph_filemap_fault, .page_mkwrite = ceph_page_mkwrite, .remap_pages = generic_file_remap_pages, }; |