CURRENT_TIME macro is not appropriate for filesystems as it doesn't use the right granularity for filesystem timestamps. Use current_fs_time() instead.
Signed-off-by: Deepa Dinamani deepa.kernel@gmail.com Cc: Chris Mason clm@fb.com Cc: Josef Bacik jbacik@fb.com Cc: David Sterba dsterba@suse.com Cc: linux-btrfs@vger.kernel.org --- changes since v1: btrfs_update_root_times uses root->fs_info instead of root->ino_cache_inode to obtain struct super_block pointer from struct btrfs_root. The issue that was reported by the kernel tester was that a null pointer dereference occurred. This is because the inode cache is disabled by default and this inode pointer was null.
Inode cache inode pointer should not be used to access super block information.
fs/btrfs/file.c | 4 ++-- fs/btrfs/inode.c | 25 +++++++++++++------------ fs/btrfs/ioctl.c | 8 ++++---- fs/btrfs/root-tree.c | 2 +- fs/btrfs/transaction.c | 7 +++++-- fs/btrfs/xattr.c | 2 +- 6 files changed, 26 insertions(+), 22 deletions(-)
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 098bb8f..610f569 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -2544,7 +2544,7 @@ out_trans: goto out_free;
inode_inc_iversion(inode); - inode->i_mtime = inode->i_ctime = CURRENT_TIME; + inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
trans->block_rsv = &root->fs_info->trans_block_rsv; ret = btrfs_update_inode(trans, root, inode); @@ -2794,7 +2794,7 @@ static long btrfs_fallocate(struct file *file, int mode, if (IS_ERR(trans)) { ret = PTR_ERR(trans); } else { - inode->i_ctime = CURRENT_TIME; + inode->i_ctime = current_fs_time(inode->i_sb); i_size_write(inode, actual_end); btrfs_ordered_update_i_size(inode, actual_end, NULL); ret = btrfs_update_inode(trans, root, inode); diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index e28f3d4..59c0e22 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -4013,7 +4013,8 @@ err: btrfs_i_size_write(dir, dir->i_size - name_len * 2); inode_inc_iversion(inode); inode_inc_iversion(dir); - inode->i_ctime = dir->i_mtime = dir->i_ctime = CURRENT_TIME; + inode->i_ctime = dir->i_mtime = + dir->i_ctime = current_fs_time(inode->i_sb); ret = btrfs_update_inode(trans, root, dir); out: return ret; @@ -4156,7 +4157,7 @@ int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
btrfs_i_size_write(dir, dir->i_size - name_len * 2); inode_inc_iversion(dir); - dir->i_mtime = dir->i_ctime = CURRENT_TIME; + dir->i_mtime = dir->i_ctime = current_fs_time(dir->i_sb); ret = btrfs_update_inode_fallback(trans, root, dir); if (ret) btrfs_abort_transaction(trans, root, ret); @@ -5588,7 +5589,7 @@ static struct inode *new_simple_dir(struct super_block *s, inode->i_op = &btrfs_dir_ro_inode_operations; inode->i_fop = &simple_dir_operations; inode->i_mode = S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO; - inode->i_mtime = CURRENT_TIME; + inode->i_mtime = current_fs_time(inode->i_sb); inode->i_atime = inode->i_mtime; inode->i_ctime = inode->i_mtime; BTRFS_I(inode)->i_otime = inode->i_mtime; @@ -6160,7 +6161,7 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, inode_init_owner(inode, dir, mode); inode_set_bytes(inode, 0);
- inode->i_mtime = CURRENT_TIME; + inode->i_mtime = current_fs_time(inode->i_sb); inode->i_atime = inode->i_mtime; inode->i_ctime = inode->i_mtime; BTRFS_I(inode)->i_otime = inode->i_mtime; @@ -6273,7 +6274,8 @@ int btrfs_add_link(struct btrfs_trans_handle *trans, btrfs_i_size_write(parent_inode, parent_inode->i_size + name_len * 2); inode_inc_iversion(parent_inode); - parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; + parent_inode->i_mtime = parent_inode->i_ctime = + current_fs_time(parent_inode->i_sb); ret = btrfs_update_inode(trans, root, parent_inode); if (ret) btrfs_abort_transaction(trans, root, ret); @@ -6491,7 +6493,7 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir, BTRFS_I(inode)->dir_index = 0ULL; inc_nlink(inode); inode_inc_iversion(inode); - inode->i_ctime = CURRENT_TIME; + inode->i_ctime = current_fs_time(inode->i_sb); ihold(inode); set_bit(BTRFS_INODE_COPY_EVERYTHING, &BTRFS_I(inode)->runtime_flags);
@@ -9234,7 +9236,6 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry, struct btrfs_root *dest = BTRFS_I(new_dir)->root; struct inode *new_inode = d_inode(new_dentry); struct inode *old_inode = d_inode(old_dentry); - struct timespec ctime = CURRENT_TIME; u64 index = 0; u64 root_objectid; int ret; @@ -9331,9 +9332,9 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry, inode_inc_iversion(old_dir); inode_inc_iversion(new_dir); inode_inc_iversion(old_inode); - old_dir->i_ctime = old_dir->i_mtime = ctime; - new_dir->i_ctime = new_dir->i_mtime = ctime; - old_inode->i_ctime = ctime; + old_dir->i_ctime = old_dir->i_mtime = + new_dir->i_ctime = new_dir->i_mtime = + old_inode->i_ctime = current_fs_time(old_dir->i_sb);
if (old_dentry->d_parent != new_dentry->d_parent) btrfs_record_unlink_dir(trans, old_dir, old_inode, 1); @@ -9358,7 +9359,7 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
if (new_inode) { inode_inc_iversion(new_inode); - new_inode->i_ctime = CURRENT_TIME; + new_inode->i_ctime = current_fs_time(new_inode->i_sb); if (unlikely(btrfs_ino(new_inode) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) { root_objectid = BTRFS_I(new_inode)->location.objectid; @@ -9836,7 +9837,7 @@ next: *alloc_hint = ins.objectid + ins.offset;
inode_inc_iversion(inode); - inode->i_ctime = CURRENT_TIME; + inode->i_ctime = current_fs_time(inode->i_sb); BTRFS_I(inode)->flags |= BTRFS_INODE_PREALLOC; if (!(mode & FALLOC_FL_KEEP_SIZE) && (actual_len > inode->i_size) && diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 952172c..6f35d9c 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -347,7 +347,7 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
btrfs_update_iflags(inode); inode_inc_iversion(inode); - inode->i_ctime = CURRENT_TIME; + inode->i_ctime = current_fs_time(inode->i_sb); ret = btrfs_update_inode(trans, root, inode);
btrfs_end_transaction(trans, root); @@ -443,7 +443,7 @@ static noinline int create_subvol(struct inode *dir, struct btrfs_root *root = BTRFS_I(dir)->root; struct btrfs_root *new_root; struct btrfs_block_rsv block_rsv; - struct timespec cur_time = CURRENT_TIME; + struct timespec cur_time = current_fs_time(dir->i_sb); struct inode *inode; int ret; int err; @@ -3148,7 +3148,7 @@ static int clone_finish_inode_update(struct btrfs_trans_handle *trans,
inode_inc_iversion(inode); if (!no_time_update) - inode->i_mtime = inode->i_ctime = CURRENT_TIME; + inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb); /* * We round up to the block size at eof when determining which * extents to clone above, but shouldn't round up the file size. @@ -4956,7 +4956,7 @@ static long _btrfs_ioctl_set_received_subvol(struct file *file, struct btrfs_root *root = BTRFS_I(inode)->root; struct btrfs_root_item *root_item = &root->root_item; struct btrfs_trans_handle *trans; - struct timespec ct = CURRENT_TIME; + struct timespec ct = current_fs_time(inode->i_sb); int ret = 0; int received_uuid_changed;
diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c index 7cf8509..a25f3b2 100644 --- a/fs/btrfs/root-tree.c +++ b/fs/btrfs/root-tree.c @@ -488,7 +488,7 @@ void btrfs_update_root_times(struct btrfs_trans_handle *trans, struct btrfs_root *root) { struct btrfs_root_item *item = &root->root_item; - struct timespec ct = CURRENT_TIME; + struct timespec ct = current_fs_time(root->fs_info->sb);
spin_lock(&root->root_item_lock); btrfs_set_root_ctransid(item, trans->transid); diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index b6031ce..37562d6 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -1333,7 +1333,7 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans, struct dentry *dentry; struct extent_buffer *tmp; struct extent_buffer *old; - struct timespec cur_time = CURRENT_TIME; + struct timespec cur_time; int ret = 0; u64 to_reserve = 0; u64 index = 0; @@ -1381,6 +1381,8 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans, parent_root = BTRFS_I(parent_inode)->root; record_root_in_trans(trans, parent_root);
+ cur_time = current_fs_time(parent_inode->i_sb); + /* * insert the directory item */ @@ -1523,7 +1525,8 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
btrfs_i_size_write(parent_inode, parent_inode->i_size + dentry->d_name.len * 2); - parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; + parent_inode->i_mtime = parent_inode->i_ctime = + current_fs_time(parent_inode->i_sb); ret = btrfs_update_inode_fallback(trans, parent_root, parent_inode); if (ret) { btrfs_abort_transaction(trans, root, ret); diff --git a/fs/btrfs/xattr.c b/fs/btrfs/xattr.c index 6c68d63..f2a20d5 100644 --- a/fs/btrfs/xattr.c +++ b/fs/btrfs/xattr.c @@ -249,7 +249,7 @@ int __btrfs_setxattr(struct btrfs_trans_handle *trans, goto out;
inode_inc_iversion(inode); - inode->i_ctime = CURRENT_TIME; + inode->i_ctime = current_fs_time(inode->i_sb); set_bit(BTRFS_INODE_COPY_EVERYTHING, &BTRFS_I(inode)->runtime_flags); ret = btrfs_update_inode(trans, root, inode); BUG_ON(ret);