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authorChris Mason <clm@fb.com>2016-01-11 17:39:28 +0100
committerChris Mason <clm@fb.com>2016-01-11 17:39:28 +0100
commit988f1f576d4f7531cb2175ee1b7cb7afd6d95d22 (patch)
treebd7d676abc4b13b749d3ad6cb41e7872a6fdfb2f /fs
parentMerge branch 'misc-cleanups-4.5' of git://git.kernel.org/pub/scm/linux/kernel... (diff)
parentBtrfs: fix fitrim discarding device area reserved for boot loader's use (diff)
downloadlinux-988f1f576d4f7531cb2175ee1b7cb7afd6d95d22.tar.xz
linux-988f1f576d4f7531cb2175ee1b7cb7afd6d95d22.zip
Merge branch 'for-chris-4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/fdmanana/linux into for-linus-4.5
Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/extent-tree.c19
-rw-r--r--fs/btrfs/inode.c21
-rw-r--r--fs/btrfs/send.c16
-rw-r--r--fs/btrfs/volumes.c20
4 files changed, 58 insertions, 18 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 03d29ead2a0f..60cc1399c64f 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3768,6 +3768,25 @@ int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
}
if (!ret) {
ret = write_one_cache_group(trans, root, path, cache);
+ /*
+ * One of the free space endio workers might have
+ * created a new block group while updating a free space
+ * cache's inode (at inode.c:btrfs_finish_ordered_io())
+ * and hasn't released its transaction handle yet, in
+ * which case the new block group is still attached to
+ * its transaction handle and its creation has not
+ * finished yet (no block group item in the extent tree
+ * yet, etc). If this is the case, wait for all free
+ * space endio workers to finish and retry. This is a
+ * a very rare case so no need for a more efficient and
+ * complex approach.
+ */
+ if (ret == -ENOENT) {
+ wait_event(cur_trans->writer_wait,
+ atomic_read(&cur_trans->num_writers) == 1);
+ ret = write_one_cache_group(trans, root, path,
+ cache);
+ }
if (ret)
btrfs_abort_transaction(trans, root, ret);
}
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 65997d66dc1b..85afe66955cf 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -6478,7 +6478,7 @@ out_unlock_inode:
static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
struct dentry *dentry)
{
- struct btrfs_trans_handle *trans;
+ struct btrfs_trans_handle *trans = NULL;
struct btrfs_root *root = BTRFS_I(dir)->root;
struct inode *inode = d_inode(old_dentry);
u64 index;
@@ -6504,6 +6504,7 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
trans = btrfs_start_transaction(root, 5);
if (IS_ERR(trans)) {
err = PTR_ERR(trans);
+ trans = NULL;
goto fail;
}
@@ -6537,9 +6538,10 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
btrfs_log_new_name(trans, inode, NULL, parent);
}
- btrfs_end_transaction(trans, root);
btrfs_balance_delayed_items(root);
fail:
+ if (trans)
+ btrfs_end_transaction(trans, root);
if (drop_inode) {
inode_dec_link_count(inode);
iput(inode);
@@ -9655,9 +9657,11 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
/*
* 2 items for inode item and ref
* 2 items for dir items
+ * 1 item for updating parent inode item
+ * 1 item for the inline extent item
* 1 item for xattr if selinux is on
*/
- trans = btrfs_start_transaction(root, 5);
+ trans = btrfs_start_transaction(root, 7);
if (IS_ERR(trans))
return PTR_ERR(trans);
@@ -9688,10 +9692,6 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
if (err)
goto out_unlock_inode;
- err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index);
- if (err)
- goto out_unlock_inode;
-
path = btrfs_alloc_path();
if (!path) {
err = -ENOMEM;
@@ -9728,6 +9728,13 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
inode_set_bytes(inode, name_len);
btrfs_i_size_write(inode, name_len);
err = btrfs_update_inode(trans, root, inode);
+ /*
+ * Last step, add directory indexes for our symlink inode. This is the
+ * last step to avoid extra cleanup of these indexes if an error happens
+ * elsewhere above.
+ */
+ if (!err)
+ err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index);
if (err) {
drop_inode = 1;
goto out_unlock_inode;
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index 355a458cba1a..63a6152be04b 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -1469,7 +1469,21 @@ static int read_symlink(struct btrfs_root *root,
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
goto out;
- BUG_ON(ret);
+ if (ret) {
+ /*
+ * An empty symlink inode. Can happen in rare error paths when
+ * creating a symlink (transaction committed before the inode
+ * eviction handler removed the symlink inode items and a crash
+ * happened in between or the subvol was snapshoted in between).
+ * Print an informative message to dmesg/syslog so that the user
+ * can delete the symlink.
+ */
+ btrfs_err(root->fs_info,
+ "Found empty symlink inode %llu at root %llu",
+ ino, root->root_key.objectid);
+ ret = -EIO;
+ goto out;
+ }
ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_file_extent_item);
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 544636e2a13a..c32abbca9d77 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1258,6 +1258,15 @@ int find_free_dev_extent_start(struct btrfs_transaction *transaction,
int ret;
int slot;
struct extent_buffer *l;
+ u64 min_search_start;
+
+ /*
+ * We don't want to overwrite the superblock on the drive nor any area
+ * used by the boot loader (grub for example), so we make sure to start
+ * at an offset of at least 1MB.
+ */
+ min_search_start = max(root->fs_info->alloc_start, 1024ull * 1024);
+ search_start = max(search_start, min_search_start);
path = btrfs_alloc_path();
if (!path)
@@ -1398,18 +1407,9 @@ int find_free_dev_extent(struct btrfs_trans_handle *trans,
struct btrfs_device *device, u64 num_bytes,
u64 *start, u64 *len)
{
- struct btrfs_root *root = device->dev_root;
- u64 search_start;
-
/* FIXME use last free of some kind */
-
- /*
- * we don't want to overwrite the superblock on the drive,
- * so we make sure to start at an offset of at least 1MB
- */
- search_start = max_t(u64, root->fs_info->alloc_start, SZ_1M);
return find_free_dev_extent_start(trans->transaction, device,
- num_bytes, search_start, start, len);
+ num_bytes, 0, start, len);
}
static int btrfs_free_dev_extent(struct btrfs_trans_handle *trans,