From 7971bd92baf729fcebe04d7330ac22dc668d0261 Mon Sep 17 00:00:00 2001 From: Sage Weil Date: Wed, 1 May 2013 21:15:58 -0700 Subject: [PATCH] ceph: revert commit 22cddde104 commit 22cddde104 breaks the atomicity of write operation, it also introduces a deadlock between write and truncate. Signed-off-by: Yan, Zheng Reviewed-by: Greg Farnum Conflicts: fs/ceph/addr.c --- fs/ceph/addr.c | 51 +++--------------------------------- fs/ceph/file.c | 73 +++++++++++++++++++++++++++++++--------------------- fs/ceph/mds_client.c | 1 + 3 files changed, 48 insertions(+), 77 deletions(-) diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index a60ea97..2a571fb 100644 --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -1067,51 +1067,23 @@ static int ceph_write_begin(struct file *file, struct address_space *mapping, struct page **pagep, void **fsdata) { struct inode *inode = file_inode(file); - struct ceph_inode_info *ci = ceph_inode(inode); - struct ceph_file_info *fi = file->private_data; struct page *page; pgoff_t index = pos >> PAGE_CACHE_SHIFT; - int r, want, got = 0; - - if (fi->fmode & CEPH_FILE_MODE_LAZY) - want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; - else - want = CEPH_CAP_FILE_BUFFER; - - dout("write_begin %p %llx.%llx %llu~%u getting caps. i_size %llu\n", - inode, ceph_vinop(inode), pos, len, inode->i_size); - r = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, pos+len); - if (r < 0) - return r; - dout("write_begin %p %llx.%llx %llu~%u got cap refs on %s\n", - inode, ceph_vinop(inode), pos, len, ceph_cap_string(got)); - if (!(got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO))) { - ceph_put_cap_refs(ci, got); - return -EAGAIN; - } + int r; do { /* get a page */ page = grab_cache_page_write_begin(mapping, index, 0); - if (!page) { - r = -ENOMEM; - break; - } + if (!page) + return -ENOMEM; + *pagep = page; dout("write_begin file %p inode %p page %p %d~%d\n", file, inode, page, (int)pos, (int)len); r = ceph_update_writeable_page(file, pos, len, page); - if (r) - page_cache_release(page); } while (r == -EAGAIN); - if (r) { - ceph_put_cap_refs(ci, got); - } else { - *pagep = page; - *(int *)fsdata = got; - } return r; } @@ -1125,12 +1097,10 @@ static int ceph_write_end(struct file *file, struct address_space *mapping, struct page *page, void *fsdata) { struct inode *inode = file_inode(file); - struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_fs_client *fsc = ceph_inode_to_client(inode); struct ceph_mds_client *mdsc = fsc->mdsc; unsigned from = pos & (PAGE_CACHE_SIZE - 1); int check_cap = 0; - int got = (unsigned long)fsdata; dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, inode, page, (int)pos, (int)copied, (int)len); @@ -1153,19 +1123,6 @@ static int ceph_write_end(struct file *file, struct address_space *mapping, up_read(&mdsc->snap_rwsem); page_cache_release(page); - if (copied > 0) { - 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("write_end %p %llx.%llx %llu~%u dropping cap refs on %s\n", - inode, ceph_vinop(inode), pos, len, ceph_cap_string(got)); - ceph_put_cap_refs(ci, got); - if (check_cap) ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); diff --git a/fs/ceph/file.c b/fs/ceph/file.c index bf338d9..b86d2a0 100644 --- a/fs/ceph/file.c +++ b/fs/ceph/file.c @@ -718,53 +718,63 @@ static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov, struct ceph_osd_client *osdc = &ceph_sb_to_client(inode->i_sb)->client->osdc; loff_t endoff = pos + iov->iov_len; - int got = 0; - int ret, err, written; + int want, got = 0; + int ret, err; if (ceph_snap(inode) != CEPH_NOSNAP) return -EROFS; retry_snap: - written = 0; if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) return -ENOSPC; __ceph_do_pending_vmtruncate(inode); + dout("aio_write %p %llx.%llx %llu~%u getting caps. i_size %llu\n", + inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len, + inode->i_size); + if (fi->fmode & CEPH_FILE_MODE_LAZY) + want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; + else + want = CEPH_CAP_FILE_BUFFER; + ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, endoff); + if (ret < 0) + goto out_put; - /* - * try to do a buffered write. if we don't have sufficient - * caps, we'll get -EAGAIN from generic_file_aio_write, or a - * short write if we only get caps for some pages. - */ - if (!(iocb->ki_filp->f_flags & O_DIRECT) && - !(inode->i_sb->s_flags & MS_SYNCHRONOUS) && - !(fi->flags & CEPH_F_SYNC)) { - ret = generic_file_aio_write(iocb, iov, nr_segs, pos); - if (ret >= 0) - written = ret; + dout("aio_write %p %llx.%llx %llu~%u got cap refs on %s\n", + inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len, + ceph_cap_string(got)); + + if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 || + (iocb->ki_filp->f_flags & O_DIRECT) || + (inode->i_sb->s_flags & MS_SYNCHRONOUS) || + (fi->flags & CEPH_F_SYNC)) { + ret = ceph_sync_write(file, iov->iov_base, iov->iov_len, + &iocb->ki_pos); + } else { + /* + * buffered write; drop Fw early to avoid slow + * revocation if we get stuck on balance_dirty_pages + */ + int dirty; + spin_lock(&ci->i_ceph_lock); + dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR); + spin_unlock(&ci->i_ceph_lock); + ceph_put_cap_refs(ci, got); + + ret = generic_file_aio_write(iocb, iov, nr_segs, pos); if ((ret >= 0 || ret == -EIOCBQUEUED) && ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host) || ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) { - err = vfs_fsync_range(file, pos, pos + written - 1, 1); + err = vfs_fsync_range(file, pos, pos + ret - 1, 1); if (err < 0) ret = err; } - if ((ret < 0 && ret != -EAGAIN) || pos + written >= endoff) - goto out; - } - dout("aio_write %p %llx.%llx %llu~%u getting caps. i_size %llu\n", - inode, ceph_vinop(inode), pos + written, - (unsigned)iov->iov_len - written, inode->i_size); - ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, 0, &got, endoff); - if (ret < 0) + if (dirty) + __mark_inode_dirty(inode, dirty); goto out; + } - dout("aio_write %p %llx.%llx %llu~%u got cap refs on %s\n", - inode, ceph_vinop(inode), pos + written, - (unsigned)iov->iov_len - written, ceph_cap_string(got)); - ret = ceph_sync_write(file, iov->iov_base + written, - iov->iov_len - written, &iocb->ki_pos); if (ret >= 0) { int dirty; spin_lock(&ci->i_ceph_lock); @@ -773,10 +783,13 @@ retry_snap: if (dirty) __mark_inode_dirty(inode, dirty); } + +out_put: dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n", - inode, ceph_vinop(inode), pos + written, - (unsigned)iov->iov_len - written, ceph_cap_string(got)); + inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len, + ceph_cap_string(got)); ceph_put_cap_refs(ci, got); + out: if (ret == -EOLDSNAPC) { dout("aio_write %p %llx.%llx %llu~%u got EOLDSNAPC, retrying\n", diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c index 56da380..9811caa 100644 --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -1916,6 +1916,7 @@ static void __wake_requests(struct ceph_mds_client *mdsc, req = list_entry(tmp_list.next, struct ceph_mds_request, r_wait); list_del_init(&req->r_wait); + dout(" wake request %p tid %llu\n", req, req->r_tid); __do_request(mdsc, req); } } -- 2.7.4