1 files changed, 147 insertions, 33 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 2c984f7d4c2a..0a6b928813a4 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -38,6 +38,7 @@
 #include <linux/falloc.h>
 #include <linux/slab.h>
 #include <linux/ratelimit.h>
+#include <linux/mount.h>
 #include "compat.h"
 #include "ctree.h"
 #include "disk-io.h"
@@ -2031,7 +2032,7 @@ int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode)
         /* insert an orphan item to track this unlinked/truncated file */
         if (insert >= 1) {
                 ret = btrfs_insert_orphan_item(trans, root, btrfs_ino(inode));
-                BUG_ON(ret);
+                BUG_ON(ret && ret != -EEXIST);
         }
 
         /* insert an orphan item to track subvolume contains orphan files */
@@ -2158,6 +2159,38 @@ int btrfs_orphan_cleanup(struct btrfs_root *root)
                 if (ret && ret != -ESTALE)
                         goto out;
 
+                if (ret == -ESTALE && root == root->fs_info->tree_root) {
+                        struct btrfs_root *dead_root;
+                        struct btrfs_fs_info *fs_info = root->fs_info;
+                        int is_dead_root = 0;
+
+                        /*
+                         * this is an orphan in the tree root. Currently these
+                         * could come from 2 sources:
+                         *  a) a snapshot deletion in progress
+                         *  b) a free space cache inode
+                         * We need to distinguish those two, as the snapshot
+                         * orphan must not get deleted.
+                         * find_dead_roots already ran before us, so if this
+                         * is a snapshot deletion, we should find the root
+                         * in the dead_roots list
+                         */
+                        spin_lock(&fs_info->trans_lock);
+                        list_for_each_entry(dead_root, &fs_info->dead_roots,
+                                            root_list) {
+                                if (dead_root->root_key.objectid ==
+                                    found_key.objectid) {
+                                        is_dead_root = 1;
+                                        break;
+                                }
+                        }
+                        spin_unlock(&fs_info->trans_lock);
+                        if (is_dead_root) {
+                                /* prevent this orphan from being found again */
+                                key.offset = found_key.objectid - 1;
+                                continue;
+                        }
+                }
                 /*
                  * Inode is already gone but the orphan item is still there,
                  * kill the orphan item.
@@ -2191,7 +2224,14 @@ int btrfs_orphan_cleanup(struct btrfs_root *root)
                                 continue;
                         }
                         nr_truncate++;
+                        /*
+                         * Need to hold the imutex for reservation purposes, not
+                         * a huge deal here but I have a WARN_ON in
+                         * btrfs_delalloc_reserve_space to catch offenders.
+                         */
+                        mutex_lock(&inode->i_mutex);
                         ret = btrfs_truncate(inode);
+                        mutex_unlock(&inode->i_mutex);
                 } else {
                         nr_unlink++;
                 }
@@ -3327,7 +3367,7 @@ int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size)
                         u64 hint_byte = 0;
                         hole_size = last_byte - cur_offset;
 
-                        trans = btrfs_start_transaction(root, 2);
+                        trans = btrfs_start_transaction(root, 3);
                         if (IS_ERR(trans)) {
                                 err = PTR_ERR(trans);
                                 break;
@@ -3337,6 +3377,7 @@ int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size)
                                                  cur_offset + hole_size,
                                                  &hint_byte, 1);
                         if (err) {
+                                btrfs_update_inode(trans, root, inode);
                                 btrfs_end_transaction(trans, root);
                                 break;
                         }
@@ -3346,6 +3387,7 @@ int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size)
                                         0, hole_size, 0, hole_size,
                                         0, 0, 0);
                         if (err) {
+                                btrfs_update_inode(trans, root, inode);
                                 btrfs_end_transaction(trans, root);
                                 break;
                         }
@@ -3353,6 +3395,7 @@ int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size)
                         btrfs_drop_extent_cache(inode, hole_start,
                                         last_byte - 1, 0);
 
+                        btrfs_update_inode(trans, root, inode);
                         btrfs_end_transaction(trans, root);
                 }
                 free_extent_map(em);
@@ -3370,6 +3413,8 @@ int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size)
 
 static int btrfs_setsize(struct inode *inode, loff_t newsize)
 {
+        struct btrfs_root *root = BTRFS_I(inode)->root;
+        struct btrfs_trans_handle *trans;
         loff_t oldsize = i_size_read(inode);
         int ret;
 
@@ -3377,16 +3422,19 @@ static int btrfs_setsize(struct inode *inode, loff_t newsize)
                 return 0;
 
         if (newsize > oldsize) {
-                i_size_write(inode, newsize);
-                btrfs_ordered_update_i_size(inode, i_size_read(inode), NULL);
                 truncate_pagecache(inode, oldsize, newsize);
                 ret = btrfs_cont_expand(inode, oldsize, newsize);
-                if (ret) {
-                        btrfs_setsize(inode, oldsize);
+                if (ret)
                         return ret;
-                }
 
-                mark_inode_dirty(inode);
+                trans = btrfs_start_transaction(root, 1);
+                if (IS_ERR(trans))
+                        return PTR_ERR(trans);
+
+                i_size_write(inode, newsize);
+                btrfs_ordered_update_i_size(inode, i_size_read(inode), NULL);
+                ret = btrfs_update_inode(trans, root, inode);
+                btrfs_end_transaction_throttle(trans, root);
         } else {
 
                 /*
@@ -3426,9 +3474,9 @@ static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
 
         if (attr->ia_valid) {
                 setattr_copy(inode, attr);
-                mark_inode_dirty(inode);
+                err = btrfs_dirty_inode(inode);
 
-                if (attr->ia_valid & ATTR_MODE)
+                if (!err && attr->ia_valid & ATTR_MODE)
                         err = btrfs_acl_chmod(inode);
         }
 
@@ -4204,42 +4252,80 @@ int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc)
  * FIXME, needs more benchmarking...there are no reasons other than performance
  * to keep or drop this code.
  */
-void btrfs_dirty_inode(struct inode *inode, int flags)
+int btrfs_dirty_inode(struct inode *inode)
 {
         struct btrfs_root *root = BTRFS_I(inode)->root;
         struct btrfs_trans_handle *trans;
         int ret;
 
         if (BTRFS_I(inode)->dummy_inode)
-                return;
+                return 0;
 
         trans = btrfs_join_transaction(root);
-        BUG_ON(IS_ERR(trans));
+        if (IS_ERR(trans))
+                return PTR_ERR(trans);
 
         ret = btrfs_update_inode(trans, root, inode);
         if (ret && ret == -ENOSPC) {
                 /* whoops, lets try again with the full transaction */
                 btrfs_end_transaction(trans, root);
                 trans = btrfs_start_transaction(root, 1);
-                if (IS_ERR(trans)) {
-                        printk_ratelimited(KERN_ERR "btrfs: fail to "
-                                       "dirty  inode %llu error %ld\n",
-                                       (unsigned long long)btrfs_ino(inode),
-                                       PTR_ERR(trans));
-                        return;
-                }
+                if (IS_ERR(trans))
+                        return PTR_ERR(trans);
 
                 ret = btrfs_update_inode(trans, root, inode);
-                if (ret) {
-                        printk_ratelimited(KERN_ERR "btrfs: fail to "
-                                       "dirty  inode %llu error %d\n",
-                                       (unsigned long long)btrfs_ino(inode),
-                                       ret);
-                }
         }
         btrfs_end_transaction(trans, root);
         if (BTRFS_I(inode)->delayed_node)
                 btrfs_balance_delayed_items(root);
+
+        return ret;
+}
+
+/*
+ * This is a copy of file_update_time.  We need this so we can return error on
+ * ENOSPC for updating the inode in the case of file write and mmap writes.
+ */
+int btrfs_update_time(struct file *file)
+{
+        struct inode *inode = file->f_path.dentry->d_inode;
+        struct timespec now;
+        int ret;
+        enum { S_MTIME = 1, S_CTIME = 2, S_VERSION = 4 } sync_it = 0;
+
+        /* First try to exhaust all avenues to not sync */
+        if (IS_NOCMTIME(inode))
+                return 0;
+
+        now = current_fs_time(inode->i_sb);
+        if (!timespec_equal(&inode->i_mtime, &now))
+                sync_it = S_MTIME;
+
+        if (!timespec_equal(&inode->i_ctime, &now))
+                sync_it |= S_CTIME;
+
+        if (IS_I_VERSION(inode))
+                sync_it |= S_VERSION;
+
+        if (!sync_it)
+                return 0;
+
+        /* Finally allowed to write? Takes lock. */
+        if (mnt_want_write_file(file))
+                return 0;
+
+        /* Only change inode inside the lock region */
+        if (sync_it & S_VERSION)
+                inode_inc_iversion(inode);
+        if (sync_it & S_CTIME)
+                inode->i_ctime = now;
+        if (sync_it & S_MTIME)
+                inode->i_mtime = now;
+        ret = btrfs_dirty_inode(inode);
+        if (!ret)
+                mark_inode_dirty_sync(inode);
+        mnt_drop_write(file->f_path.mnt);
+        return ret;
 }
 
 /*
@@ -4555,11 +4641,18 @@ static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
                 goto out_unlock;
         }
 
+        /*
+        * If the active LSM wants to access the inode during
+        * d_instantiate it needs these. Smack checks to see
+        * if the filesystem supports xattrs by looking at the
+        * ops vector.
+        */
+
+        inode->i_op = &btrfs_special_inode_operations;
         err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index);
         if (err)
                 drop_inode = 1;
         else {
-                inode->i_op = &btrfs_special_inode_operations;
                 init_special_inode(inode, inode->i_mode, rdev);
                 btrfs_update_inode(trans, root, inode);
         }
@@ -4613,14 +4706,21 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
                 goto out_unlock;
         }
 
+        /*
+        * If the active LSM wants to access the inode during
+        * d_instantiate it needs these. Smack checks to see
+        * if the filesystem supports xattrs by looking at the
+        * ops vector.
+        */
+        inode->i_fop = &btrfs_file_operations;
+        inode->i_op = &btrfs_file_inode_operations;
+
         err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index);
         if (err)
                 drop_inode = 1;
         else {
                 inode->i_mapping->a_ops = &btrfs_aops;
                 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
-                inode->i_fop = &btrfs_file_operations;
-                inode->i_op = &btrfs_file_inode_operations;
                 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
         }
 out_unlock:
@@ -6303,7 +6403,12 @@ int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
         u64 page_start;
         u64 page_end;
 
+        /* Need this to keep space reservations serialized */
+        mutex_lock(&inode->i_mutex);
         ret  = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE);
+        mutex_unlock(&inode->i_mutex);
+        if (!ret)
+                ret = btrfs_update_time(vma->vm_file);
         if (ret) {
                 if (ret == -ENOMEM)
                         ret = VM_FAULT_OOM;
@@ -6515,8 +6620,9 @@ static int btrfs_truncate(struct inode *inode)
                         /* Just need the 1 for updating the inode */
                         trans = btrfs_start_transaction(root, 1);
                         if (IS_ERR(trans)) {
-                                err = PTR_ERR(trans);
-                                goto out;
+                                ret = err = PTR_ERR(trans);
+                                trans = NULL;
+                                break;
                         }
                 }
 
@@ -7076,14 +7182,21 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
                 goto out_unlock;
         }
 
+        /*
+        * If the active LSM wants to access the inode during
+        * d_instantiate it needs these. Smack checks to see
+        * if the filesystem supports xattrs by looking at the
+        * ops vector.
+        */
+        inode->i_fop = &btrfs_file_operations;
+        inode->i_op = &btrfs_file_inode_operations;
+
         err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index);
         if (err)
                 drop_inode = 1;
         else {
                 inode->i_mapping->a_ops = &btrfs_aops;
                 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
-                inode->i_fop = &btrfs_file_operations;
-                inode->i_op = &btrfs_file_inode_operations;
                 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
         }
         if (drop_inode)
@@ -7353,6 +7466,7 @@ static const struct inode_operations btrfs_symlink_inode_operations = {
         .follow_link    = page_follow_link_light,
         .put_link       = page_put_link,
         .getattr        = btrfs_getattr,
+        .setattr        = btrfs_setattr,
         .permission     = btrfs_permission,
         .setxattr       = btrfs_setxattr,
         .getxattr       = btrfs_getxattr,