ceph: don't call truncate_pagecache in ceph_writepages_start
truncate_pagecache() may decrease inode's reference. This can cause deadlock if inode's last reference is dropped and iput_final() wants to evict the inode. (evict() calls inode_wait_for_writeback(), which waits for ceph_writepages_start() to return). The fix is use work thead to truncate dirty pages. Also add 'forced umount' check to ceph_update_writeable_page(), which prevents new pages getting dirty. Signed-off-by: Yan, Zheng <zyan@redhat.com>
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Родитель
77310320c2
Коммит
6c93df5db6
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@ -715,8 +715,11 @@ static int ceph_writepages_start(struct address_space *mapping,
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(wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD"));
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if (ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
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pr_warn("writepage_start %p on forced umount\n", inode);
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truncate_pagecache(inode, 0);
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if (ci->i_wrbuffer_ref > 0) {
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pr_warn_ratelimited(
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"writepage_start %p %lld forced umount\n",
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inode, ceph_ino(inode));
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}
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mapping_set_error(mapping, -EIO);
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return -EIO; /* we're in a forced umount, don't write! */
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}
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@ -1127,6 +1130,7 @@ static int ceph_update_writeable_page(struct file *file,
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struct page *page)
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{
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struct inode *inode = file_inode(file);
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struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
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struct ceph_inode_info *ci = ceph_inode(inode);
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loff_t page_off = pos & PAGE_MASK;
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int pos_in_page = pos & ~PAGE_MASK;
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@ -1135,6 +1139,12 @@ static int ceph_update_writeable_page(struct file *file,
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int r;
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struct ceph_snap_context *snapc, *oldest;
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if (ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
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dout(" page %p forced umount\n", page);
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unlock_page(page);
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return -EIO;
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}
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retry_locked:
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/* writepages currently holds page lock, but if we change that later, */
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wait_on_page_writeback(page);
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@ -1623,10 +1623,21 @@ static void ceph_invalidate_work(struct work_struct *work)
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struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
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i_pg_inv_work);
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struct inode *inode = &ci->vfs_inode;
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struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
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u32 orig_gen;
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int check = 0;
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mutex_lock(&ci->i_truncate_mutex);
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if (ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
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pr_warn_ratelimited("invalidate_pages %p %lld forced umount\n",
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inode, ceph_ino(inode));
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mapping_set_error(inode->i_mapping, -EIO);
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truncate_pagecache(inode, 0);
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mutex_unlock(&ci->i_truncate_mutex);
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goto out;
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}
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spin_lock(&ci->i_ceph_lock);
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dout("invalidate_pages %p gen %d revoking %d\n", inode,
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ci->i_rdcache_gen, ci->i_rdcache_revoking);
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@ -1120,9 +1120,11 @@ out:
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static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
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void *arg)
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{
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struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
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struct ceph_inode_info *ci = ceph_inode(inode);
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LIST_HEAD(to_remove);
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int drop = 0;
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bool drop = false;
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bool invalidate = false;
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dout("removing cap %p, ci is %p, inode is %p\n",
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cap, ci, &ci->vfs_inode);
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@ -1130,11 +1132,14 @@ static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
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__ceph_remove_cap(cap, false);
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if (!ci->i_auth_cap) {
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struct ceph_cap_flush *cf;
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struct ceph_mds_client *mdsc =
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ceph_sb_to_client(inode->i_sb)->mdsc;
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struct ceph_mds_client *mdsc = fsc->mdsc;
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ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
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if (ci->i_wrbuffer_ref > 0 &&
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ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
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invalidate = true;
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while (true) {
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struct rb_node *n = rb_first(&ci->i_cap_flush_tree);
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if (!n)
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@ -1156,7 +1161,7 @@ static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
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inode, ceph_ino(inode));
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ci->i_dirty_caps = 0;
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list_del_init(&ci->i_dirty_item);
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drop = 1;
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drop = true;
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}
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if (!list_empty(&ci->i_flushing_item)) {
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pr_warn_ratelimited(
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@ -1166,7 +1171,7 @@ static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
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ci->i_flushing_caps = 0;
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list_del_init(&ci->i_flushing_item);
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mdsc->num_cap_flushing--;
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drop = 1;
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drop = true;
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}
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spin_unlock(&mdsc->cap_dirty_lock);
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@ -1185,6 +1190,8 @@ static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
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}
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wake_up_all(&ci->i_cap_wq);
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if (invalidate)
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ceph_queue_invalidate(inode);
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if (drop)
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iput(inode);
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return 0;
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@ -1195,12 +1202,13 @@ static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
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*/
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static void remove_session_caps(struct ceph_mds_session *session)
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{
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struct ceph_fs_client *fsc = session->s_mdsc->fsc;
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struct super_block *sb = fsc->sb;
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dout("remove_session_caps on %p\n", session);
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iterate_session_caps(session, remove_session_caps_cb, NULL);
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iterate_session_caps(session, remove_session_caps_cb, fsc);
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spin_lock(&session->s_cap_lock);
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if (session->s_nr_caps > 0) {
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struct super_block *sb = session->s_mdsc->fsc->sb;
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struct inode *inode;
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struct ceph_cap *cap, *prev = NULL;
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struct ceph_vino vino;
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