Btrfs: Fixes for 2.6.28-rc API changes

* open/close_bdev_excl -> open/close_bdev_exclusive
* blkdev_issue_discard takes a GFP mask now
* Fix blkdev_issue_discard usage now that it is enabled

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

7 files changed, 74 insertions, 46 deletions

diff --git a/fs/btrfs/compat.h b/fs/btrfs/compat.h
index cd6598b169df..dd1defdbfa36 100644
--- a/fs/btrfs/compat.h
+++ b/fs/btrfs/compat.h
@@ -21,4 +21,11 @@ static inline struct dentry *d_obtain_alias(struct inode *inode)
 }
 #endif
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)
+# define  __pagevec_lru_add_file __pagevec_lru_add
+# define open_bdev_exclusive open_bdev_excl
+# define close_bdev_exclusive(bdev, mode) close_bdev_excl(bdev)
+#endif
+
+
 #endif /* _COMPAT_H_ */
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index bfd1512cce0a..df05f513e1eb 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -419,7 +419,7 @@ static noinline int add_ra_bio_pages(struct inode *inode,
                 /* open coding of lru_cache_add, also not exported */
                 page_cache_get(page);
                 if (!pagevec_add(&pvec, page))
-                        __pagevec_lru_add(&pvec);
+                        __pagevec_lru_add_file(&pvec);
 
                 end = last_offset + PAGE_CACHE_SIZE - 1;
                 /*
@@ -475,7 +475,7 @@ next:
                 last_offset += PAGE_CACHE_SIZE;
         }
         if (pagevec_count(&pvec))
-                __pagevec_lru_add(&pvec);
+                __pagevec_lru_add_file(&pvec);
         return 0;
 }
 
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index ee73efe75423..62d49705d140 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -28,6 +28,7 @@
 #include "volumes.h"
 #include "locking.h"
 #include "ref-cache.h"
+#include "compat.h"
 
 #define PENDING_EXTENT_INSERT 0
 #define PENDING_EXTENT_DELETE 1
@@ -899,6 +900,17 @@ static int noinline remove_extent_backref(struct btrfs_trans_handle *trans,
         return ret;
 }
 
+static void btrfs_issue_discard(struct block_device *bdev,
+                                u64 start, u64 len)
+{
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,28)
+        blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL);
+#else
+        blkdev_issue_discard(bdev, start >> 9, len >> 9);
+#endif
+}
+
+
 static int noinline free_extents(struct btrfs_trans_handle *trans,
                                  struct btrfs_root *extent_root,
                                  struct list_head *del_list)
@@ -1108,6 +1120,7 @@ search:
                         BUG_ON(ret);
 
 #ifdef BIO_RW_DISCARD
+                        map_length = tmp->num_bytes;
                         ret = btrfs_map_block(&info->mapping_tree, READ,
                                               tmp->bytenr, &map_length, &multi,
                                               0);
@@ -1115,16 +1128,16 @@ search:
                                 struct btrfs_bio_stripe *stripe;
                                 int i;
 
-                                stripe = multi->stripe;
+                                stripe = multi->stripes;
 
                                 if (map_length > tmp->num_bytes)
                                         map_length = tmp->num_bytes;
 
                                 for (i = 0; i < multi->num_stripes;
                                      i++, stripe++)
-                                        blkdev_issue_discard(stripe->dev->bdev,
-                                                        stripe->physical >> 9,
-                                                        map_length >> 9);
+                                        btrfs_issue_discard(stripe->dev->bdev,
+                                                            stripe->physical,
+                                                            map_length);
                                 kfree(multi);
                         }
 #endif
@@ -2498,9 +2511,9 @@ static int __free_extent(struct btrfs_trans_handle *trans,
                                 map_length = num_bytes;
 
                         for (i = 0; i < multi->num_stripes; i++, stripe++) {
-                                blkdev_issue_discard(stripe->dev->bdev,
-                                                     stripe->physical >> 9,
-                                                     map_length >> 9);
+                                btrfs_issue_discard(stripe->dev->bdev,
+                                                    stripe->physical,
+                                                     map_length);
                         }
                         kfree(multi);
                 }
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index a0f3804efe4f..3a65c10dce33 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2639,14 +2639,14 @@ int extent_readpages(struct extent_io_tree *tree,
                         /* open coding of lru_cache_add, also not exported */
                         page_cache_get(page);
                         if (!pagevec_add(&pvec, page))
-                                __pagevec_lru_add(&pvec);
+                                __pagevec_lru_add_file(&pvec);
                         __extent_read_full_page(tree, page, get_extent,
                                                 &bio, 0, &bio_flags);
                 }
                 page_cache_release(page);
         }
         if (pagevec_count(&pvec))
-                __pagevec_lru_add(&pvec);
+                __pagevec_lru_add_file(&pvec);
         BUG_ON(!list_empty(pages));
         if (bio)
                 submit_one_bio(READ, bio, 0, bio_flags);
diff --git a/fs/btrfs/version.sh b/fs/btrfs/version.sh
index 0f57f24404d9..1ca1952fd917 100644
--- a/fs/btrfs/version.sh
+++ b/fs/btrfs/version.sh
@@ -8,24 +8,24 @@
  
 v="v0.16"
 
-which hg > /dev/null
-if [ -d .hg ] && [ $? == 0 ]; then
-        last=$(hg tags | grep -m1 -o '^v[0-9.]\+')
-         
-        # now check if the repo has commits since then...
-        if [[ $(hg id -t) == $last || \
-            $(hg di -r "$last:." | awk '/^diff/{print $NF}' | sort -u) == .hgtags ]]
-        then
-            # check if it's dirty
-            if [[ $(hg id | cut -d' ' -f1) == *+ ]]; then
-                v=$last+
-            else
-                v=$last
+which git &> /dev/null
+if [ $? == 0 ]; then
+    git branch >& /dev/null
+    if [ $? == 0 ]; then
+            if head=`git rev-parse --verify HEAD 2>/dev/null`; then
+                if tag=`git describe --tags 2>/dev/null`; then
+                    v="$tag"
+                fi
+
+                # Are there uncommitted changes?
+                git update-index --refresh --unmerged > /dev/null
+                if git diff-index --name-only HEAD | \
+                    grep -v "^scripts/package" \
+                    | read dummy; then
+                    v="$v"-dirty
+                fi
             fi
-        else
-            # includes dirty flag
-            v=$last+$(hg id -i)
-        fi
+    fi
 fi
  
 echo "#ifndef __BUILD_VERSION" > .build-version.h
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index ecf0633ab8cc..c3ee63f92a5f 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -85,7 +85,7 @@ int btrfs_cleanup_fs_uuids(void)
                         dev = list_entry(fs_devices->devices.next,
                                          struct btrfs_device, dev_list);
                         if (dev->bdev) {
-                                close_bdev_excl(dev->bdev);
+                                close_bdev_exclusive(dev->bdev, dev->mode);
                                 fs_devices->open_devices--;
                         }
                         fs_devices->num_devices--;
@@ -317,7 +317,7 @@ again:
                         continue;
 
                 if (device->bdev) {
-                        close_bdev_excl(device->bdev);
+                        close_bdev_exclusive(device->bdev, device->mode);
                         device->bdev = NULL;
                         fs_devices->open_devices--;
                 }
@@ -356,7 +356,7 @@ again:
         list_for_each(cur, &fs_devices->devices) {
                 device = list_entry(cur, struct btrfs_device, dev_list);
                 if (device->bdev) {
-                        close_bdev_excl(device->bdev);
+                        close_bdev_exclusive(device->bdev, device->mode);
                         fs_devices->open_devices--;
                 }
                 if (device->writeable) {
@@ -391,7 +391,8 @@ int btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
         return ret;
 }
 
-int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices, void *holder)
+int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
+                         int flags, void *holder)
 {
         struct block_device *bdev;
         struct list_head *head = &fs_devices->devices;
@@ -413,7 +414,7 @@ int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices, void *holder)
                 if (!device->name)
                         continue;
 
-                bdev = open_bdev_excl(device->name, MS_RDONLY, holder);
+                bdev = open_bdev_exclusive(device->name, flags, holder);
                 if (IS_ERR(bdev)) {
                         printk("open %s failed\n", device->name);
                         goto error;
@@ -453,6 +454,8 @@ int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices, void *holder)
 
                 device->bdev = bdev;
                 device->in_fs_metadata = 0;
+                device->mode = flags;
+
                 fs_devices->open_devices++;
                 if (device->writeable) {
                         fs_devices->rw_devices++;
@@ -464,7 +467,7 @@ int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices, void *holder)
 error_brelse:
                 brelse(bh);
 error_close:
-                close_bdev_excl(bdev);
+                close_bdev_exclusive(bdev, MS_RDONLY);
 error:
                 continue;
         }
@@ -496,7 +499,7 @@ int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
                         ret = 0;
                 }
         } else {
-                ret = __btrfs_open_devices(fs_devices, holder);
+                ret = __btrfs_open_devices(fs_devices, flags, holder);
         }
         mutex_unlock(&uuid_mutex);
         return ret;
@@ -514,7 +517,7 @@ int btrfs_scan_one_device(const char *path, int flags, void *holder,
 
         mutex_lock(&uuid_mutex);
 
-        bdev = open_bdev_excl(path, flags, holder);
+        bdev = open_bdev_exclusive(path, flags, holder);
 
         if (IS_ERR(bdev)) {
                 ret = PTR_ERR(bdev);
@@ -551,7 +554,7 @@ int btrfs_scan_one_device(const char *path, int flags, void *holder,
 error_brelse:
         brelse(bh);
 error_close:
-        close_bdev_excl(bdev);
+        close_bdev_exclusive(bdev, flags);
 error:
         mutex_unlock(&uuid_mutex);
         return ret;
@@ -1003,7 +1006,7 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
                         goto out;
                 }
         } else {
-                bdev = open_bdev_excl(device_path, MS_RDONLY,
+                bdev = open_bdev_exclusive(device_path, MS_RDONLY,
                                       root->fs_info->bdev_holder);
                 if (IS_ERR(bdev)) {
                         ret = PTR_ERR(bdev);
@@ -1073,10 +1076,10 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
                 BUG_ON(device->writeable);
                 brelse(bh);
                 if (bdev)
-                        close_bdev_excl(bdev);
+                        close_bdev_exclusive(bdev, MS_RDONLY);
 
                 if (device->bdev) {
-                        close_bdev_excl(device->bdev);
+                        close_bdev_exclusive(device->bdev, device->mode);
                         device->bdev = NULL;
                         device->fs_devices->open_devices--;
                 }
@@ -1112,11 +1115,11 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
 
         if (device->bdev) {
                 /* one close for the device struct or super_block */
-                close_bdev_excl(device->bdev);
+                close_bdev_exclusive(device->bdev, device->mode);
         }
         if (bdev) {
                 /* one close for us */
-                close_bdev_excl(bdev);
+                close_bdev_exclusive(bdev, MS_RDONLY);
         }
         kfree(device->name);
         kfree(device);
@@ -1127,7 +1130,7 @@ error_brelse:
         brelse(bh);
 error_close:
         if (bdev)
-                close_bdev_excl(bdev);
+                close_bdev_exclusive(bdev, MS_RDONLY);
 out:
         mutex_unlock(&root->fs_info->volume_mutex);
         mutex_unlock(&uuid_mutex);
@@ -1272,7 +1275,7 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
         if ((sb->s_flags & MS_RDONLY) && !root->fs_info->fs_devices->seeding)
                 return -EINVAL;
 
-        bdev = open_bdev_excl(device_path, 0, root->fs_info->bdev_holder);
+        bdev = open_bdev_exclusive(device_path, 0, root->fs_info->bdev_holder);
         if (!bdev) {
                 return -EIO;
         }
@@ -1331,6 +1334,7 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
         device->dev_root = root->fs_info->dev_root;
         device->bdev = bdev;
         device->in_fs_metadata = 1;
+        device->mode = 0;
         set_blocksize(device->bdev, 4096);
 
         if (seeding_dev) {
@@ -1379,7 +1383,7 @@ out:
         mutex_unlock(&root->fs_info->volume_mutex);
         return ret;
 error:
-        close_bdev_excl(bdev);
+        close_bdev_exclusive(bdev, 0);
         if (seeding_dev) {
                 mutex_unlock(&uuid_mutex);
                 up_write(&sb->s_umount);
@@ -2907,7 +2911,8 @@ static int open_seed_devices(struct btrfs_root *root, u8 *fsid)
                 goto out;
         }
 
-        ret = __btrfs_open_devices(fs_devices, root->fs_info->bdev_holder);
+        ret = __btrfs_open_devices(fs_devices, MS_RDONLY,
+                                   root->fs_info->bdev_holder);
         if (ret)
                 goto out;
 
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 1f6f25a5787f..9b41e4d3984d 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -42,6 +42,9 @@ struct btrfs_device {
 
         struct block_device *bdev;
 
+        /* the mode sent to open_bdev_exclusive */
+        fmode_t mode;
+
         char *name;
 
         /* the internal btrfs device id */