Btrfs: Add debugging checks to track down corrupted metadata

Signed-off-by: Chris Mason <chris.mason@oracle.com>

4 files changed, 49 insertions, 34 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 6a218f792e59..8e7a938bfbc7 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -250,7 +250,7 @@ static int btree_read_extent_buffer_pages(struct btrfs_root *root,
                 if (!ret &&
                     !verify_parent_transid(io_tree, eb, parent_transid))
                         return ret;
-
+printk("read extent buffer pages failed with ret %d mirror no %d\n", ret, mirror_num);
                 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
                                               eb->start, eb->len);
                 if (num_copies == 1)
@@ -348,6 +348,9 @@ int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end,
 
         found_start = btrfs_header_bytenr(eb);
         if (found_start != start) {
+                printk("bad tree block start %llu %llu\n",
+                       (unsigned long long)found_start,
+                       (unsigned long long)eb->start);
                 ret = -EIO;
                 goto err;
         }
@@ -709,6 +712,8 @@ struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
 
         if (ret == 0) {
                 buf->flags |= EXTENT_UPTODATE;
+        } else {
+                WARN_ON(1);
         }
         return buf;
 
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 83ba0c328722..7ca89c45d401 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1811,6 +1811,7 @@ printk("2bad mapping end %Lu cur %Lu\n", end, cur);
                 }
                 /* the get_extent function already copied into the page */
                 if (test_range_bit(tree, cur, cur_end, EXTENT_UPTODATE, 1)) {
+                        check_page_uptodate(tree, page);
                         unlock_extent(tree, cur, cur + iosize - 1, GFP_NOFS);
                         cur = cur + iosize;
                         page_offset += iosize;
@@ -2785,21 +2786,20 @@ int set_extent_buffer_dirty(struct extent_io_tree *tree,
                  * properly set.  releasepage may drop page->private
                  * on us if the page isn't already dirty.
                  */
+                lock_page(page);
                 if (i == 0) {
-                        lock_page(page);
                         set_page_extent_head(page, eb->len);
                 } else if (PagePrivate(page) &&
                            page->private != EXTENT_PAGE_PRIVATE) {
-                        lock_page(page);
                         set_page_extent_mapped(page);
-                        unlock_page(page);
                 }
                 __set_page_dirty_nobuffers(extent_buffer_page(eb, i));
-                if (i == 0)
-                        unlock_page(page);
+                set_extent_dirty(tree, page_offset(page),
+                                 page_offset(page) + PAGE_CACHE_SIZE -1,
+                                 GFP_NOFS);
+                unlock_page(page);
         }
-        return set_extent_dirty(tree, eb->start,
-                                eb->start + eb->len - 1, GFP_NOFS);
+        return 0;
 }
 EXPORT_SYMBOL(set_extent_buffer_dirty);
 
@@ -2952,6 +2952,9 @@ int read_extent_buffer_pages(struct extent_io_tree *tree,
         if (all_uptodate) {
                 if (start_i == 0)
                         eb->flags |= EXTENT_UPTODATE;
+                if (ret) {
+                        printk("all up to date but ret is %d\n", ret);
+                }
                 goto unlock_exit;
         }
 
@@ -2968,6 +2971,7 @@ int read_extent_buffer_pages(struct extent_io_tree *tree,
                                                       mirror_num);
                         if (err) {
                                 ret = err;
+                                printk("err %d from __extent_read_full_page\n", ret);
                         }
                 } else {
                         unlock_page(page);
@@ -2978,12 +2982,15 @@ int read_extent_buffer_pages(struct extent_io_tree *tree,
                 submit_one_bio(READ, bio, mirror_num);
 
         if (ret || !wait) {
+                if (ret)
+                        printk("ret %d wait %d returning\n", ret, wait);
                 return ret;
         }
         for (i = start_i; i < num_pages; i++) {
                 page = extent_buffer_page(eb, i);
                 wait_on_page_locked(page);
                 if (!PageUptodate(page)) {
+                        printk("page not uptodate after wait_on_page_locked\n");
                         ret = -EIO;
                 }
         }
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index eb8e4556fa71..e9e86fbaa243 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -39,9 +39,10 @@
 #include "compat.h"
 
 
-static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes,
-                                struct page **prepared_pages,
-                                const char __user * buf)
+static int noinline btrfs_copy_from_user(loff_t pos, int num_pages,
+                                         int write_bytes,
+                                         struct page **prepared_pages,
+                                         const char __user * buf)
 {
         long page_fault = 0;
         int i;
@@ -69,7 +70,7 @@ static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes,
         return page_fault ? -EFAULT : 0;
 }
 
-static void btrfs_drop_pages(struct page **pages, size_t num_pages)
+static void noinline btrfs_drop_pages(struct page **pages, size_t num_pages)
 {
         size_t i;
         for (i = 0; i < num_pages; i++) {
@@ -359,7 +360,7 @@ out_unlock:
         return err;
 }
 
-int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end)
+int noinline btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end)
 {
         struct extent_map *em;
         struct extent_map *split = NULL;
@@ -515,7 +516,7 @@ out:
  * it is either truncated or split.  Anything entirely inside the range
  * is deleted from the tree.
  */
-int btrfs_drop_extents(struct btrfs_trans_handle *trans,
+int noinline btrfs_drop_extents(struct btrfs_trans_handle *trans,
                        struct btrfs_root *root, struct inode *inode,
                        u64 start, u64 end, u64 inline_limit, u64 *hint_byte)
 {
@@ -785,7 +786,7 @@ out:
 /*
  * this gets pages into the page cache and locks them down
  */
-static int prepare_pages(struct btrfs_root *root, struct file *file,
+static int noinline prepare_pages(struct btrfs_root *root, struct file *file,
                          struct page **pages, size_t num_pages,
                          loff_t pos, unsigned long first_index,
                          unsigned long last_index, size_t write_bytes)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 5b1b60839d21..37a8ea23e81d 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -94,8 +94,8 @@ int btrfs_cleanup_fs_uuids(void)
         return 0;
 }
 
-static struct btrfs_device *__find_device(struct list_head *head, u64 devid,
-                                          u8 *uuid)
+static noinline struct btrfs_device *__find_device(struct list_head *head,
+                                                   u64 devid, u8 *uuid)
 {
         struct btrfs_device *dev;
         struct list_head *cur;
@@ -110,7 +110,7 @@ static struct btrfs_device *__find_device(struct list_head *head, u64 devid,
         return NULL;
 }
 
-static struct btrfs_fs_devices *find_fsid(u8 *fsid)
+static noinline struct btrfs_fs_devices *find_fsid(u8 *fsid)
 {
         struct list_head *cur;
         struct btrfs_fs_devices *fs_devices;
@@ -134,7 +134,7 @@ static struct btrfs_fs_devices *find_fsid(u8 *fsid)
  * the list if the block device is congested.  This way, multiple devices
  * can make progress from a single worker thread.
  */
-int run_scheduled_bios(struct btrfs_device *device)
+static int noinline run_scheduled_bios(struct btrfs_device *device)
 {
         struct bio *pending;
         struct backing_dev_info *bdi;
@@ -233,7 +233,7 @@ void pending_bios_fn(struct btrfs_work *work)
         run_scheduled_bios(device);
 }
 
-static int device_list_add(const char *path,
+static noinline int device_list_add(const char *path,
                            struct btrfs_super_block *disk_super,
                            u64 devid, struct btrfs_fs_devices **fs_devices_ret)
 {
@@ -480,10 +480,10 @@ error:
  * called very infrequently and that a given device has a small number
  * of extents
  */
-static int find_free_dev_extent(struct btrfs_trans_handle *trans,
-                                struct btrfs_device *device,
-                                struct btrfs_path *path,
-                                u64 num_bytes, u64 *start)
+static noinline int find_free_dev_extent(struct btrfs_trans_handle *trans,
+                                         struct btrfs_device *device,
+                                         struct btrfs_path *path,
+                                         u64 num_bytes, u64 *start)
 {
         struct btrfs_key key;
         struct btrfs_root *root = device->dev_root;
@@ -645,7 +645,7 @@ int btrfs_free_dev_extent(struct btrfs_trans_handle *trans,
         return ret;
 }
 
-int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
+int noinline btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
                            struct btrfs_device *device,
                            u64 chunk_tree, u64 chunk_objectid,
                            u64 chunk_offset,
@@ -693,7 +693,8 @@ err:
         return ret;
 }
 
-static int find_next_chunk(struct btrfs_root *root, u64 objectid, u64 *offset)
+static noinline int find_next_chunk(struct btrfs_root *root,
+                                    u64 objectid, u64 *offset)
 {
         struct btrfs_path *path;
         int ret;
@@ -735,8 +736,8 @@ error:
         return ret;
 }
 
-static int find_next_devid(struct btrfs_root *root, struct btrfs_path *path,
-                           u64 *objectid)
+static noinline int find_next_devid(struct btrfs_root *root,
+                                    struct btrfs_path *path, u64 *objectid)
 {
         int ret;
         struct btrfs_key key;
@@ -1103,8 +1104,8 @@ out_close_bdev:
         goto out;
 }
 
-int btrfs_update_device(struct btrfs_trans_handle *trans,
-                        struct btrfs_device *device)
+int noinline btrfs_update_device(struct btrfs_trans_handle *trans,
+                                 struct btrfs_device *device)
 {
         int ret;
         struct btrfs_path *path;
@@ -1544,8 +1545,8 @@ int btrfs_add_system_chunk(struct btrfs_trans_handle *trans,
         return 0;
 }
 
-static u64 chunk_bytes_by_type(u64 type, u64 calc_size, int num_stripes,
-                               int sub_stripes)
+static u64 noinline chunk_bytes_by_type(u64 type, u64 calc_size,
+                                        int num_stripes, int sub_stripes)
 {
         if (type & (BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP))
                 return calc_size;
@@ -2141,8 +2142,9 @@ struct async_sched {
  * This will add one bio to the pending list for a device and make sure
  * the work struct is scheduled.
  */
-int schedule_bio(struct btrfs_root *root, struct btrfs_device *device,
-                 int rw, struct bio *bio)
+static int noinline schedule_bio(struct btrfs_root *root,
+                                 struct btrfs_device *device,
+                                 int rw, struct bio *bio)
 {
         int should_queue = 1;