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authorLinus Torvalds <torvalds@linux-foundation.org>2010-07-19 19:33:02 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-07-19 19:33:02 -0700
commitee1039307a8a64b038f9b8cdc6f9120ecd9dfe9b (patch)
tree05d4bb91752fdb1652a93bcd2ad4514cc697c2df /fs
parentd0c6f6258478e1dba532bf7c28e2cd6e1047d3a4 (diff)
parent2ebc3464781ad24474abcbd2274e6254689853b5 (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
* git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable: Btrfs: fix checks in BTRFS_IOC_CLONE_RANGE Btrfs: fix CLONE ioctl destination file size expansion to block boundary Btrfs: fix split_leaf double split corner case
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/ctree.c129
-rw-r--r--fs/btrfs/ioctl.c20
2 files changed, 126 insertions, 23 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 0d1d966b0fe4..c3df14ce2cc2 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -2304,12 +2304,17 @@ noinline int btrfs_leaf_free_space(struct btrfs_root *root,
return ret;
}
+/*
+ * min slot controls the lowest index we're willing to push to the
+ * right. We'll push up to and including min_slot, but no lower
+ */
static noinline int __push_leaf_right(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
int data_size, int empty,
struct extent_buffer *right,
- int free_space, u32 left_nritems)
+ int free_space, u32 left_nritems,
+ u32 min_slot)
{
struct extent_buffer *left = path->nodes[0];
struct extent_buffer *upper = path->nodes[1];
@@ -2327,7 +2332,7 @@ static noinline int __push_leaf_right(struct btrfs_trans_handle *trans,
if (empty)
nr = 0;
else
- nr = 1;
+ nr = max_t(u32, 1, min_slot);
if (path->slots[0] >= left_nritems)
push_space += data_size;
@@ -2469,10 +2474,14 @@ out_unlock:
*
* returns 1 if the push failed because the other node didn't have enough
* room, 0 if everything worked out and < 0 if there were major errors.
+ *
+ * this will push starting from min_slot to the end of the leaf. It won't
+ * push any slot lower than min_slot
*/
static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, struct btrfs_path *path, int data_size,
- int empty)
+ *root, struct btrfs_path *path,
+ int min_data_size, int data_size,
+ int empty, u32 min_slot)
{
struct extent_buffer *left = path->nodes[0];
struct extent_buffer *right;
@@ -2514,8 +2523,8 @@ static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root
if (left_nritems == 0)
goto out_unlock;
- return __push_leaf_right(trans, root, path, data_size, empty,
- right, free_space, left_nritems);
+ return __push_leaf_right(trans, root, path, min_data_size, empty,
+ right, free_space, left_nritems, min_slot);
out_unlock:
btrfs_tree_unlock(right);
free_extent_buffer(right);
@@ -2525,12 +2534,17 @@ out_unlock:
/*
* push some data in the path leaf to the left, trying to free up at
* least data_size bytes. returns zero if the push worked, nonzero otherwise
+ *
+ * max_slot can put a limit on how far into the leaf we'll push items. The
+ * item at 'max_slot' won't be touched. Use (u32)-1 to make us do all the
+ * items
*/
static noinline int __push_leaf_left(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path, int data_size,
int empty, struct extent_buffer *left,
- int free_space, int right_nritems)
+ int free_space, u32 right_nritems,
+ u32 max_slot)
{
struct btrfs_disk_key disk_key;
struct extent_buffer *right = path->nodes[0];
@@ -2549,9 +2563,9 @@ static noinline int __push_leaf_left(struct btrfs_trans_handle *trans,
slot = path->slots[1];
if (empty)
- nr = right_nritems;
+ nr = min(right_nritems, max_slot);
else
- nr = right_nritems - 1;
+ nr = min(right_nritems - 1, max_slot);
for (i = 0; i < nr; i++) {
item = btrfs_item_nr(right, i);
@@ -2712,10 +2726,14 @@ out:
/*
* push some data in the path leaf to the left, trying to free up at
* least data_size bytes. returns zero if the push worked, nonzero otherwise
+ *
+ * max_slot can put a limit on how far into the leaf we'll push items. The
+ * item at 'max_slot' won't be touched. Use (u32)-1 to make us push all the
+ * items
*/
static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, struct btrfs_path *path, int data_size,
- int empty)
+ *root, struct btrfs_path *path, int min_data_size,
+ int data_size, int empty, u32 max_slot)
{
struct extent_buffer *right = path->nodes[0];
struct extent_buffer *left;
@@ -2761,8 +2779,9 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
goto out;
}
- return __push_leaf_left(trans, root, path, data_size,
- empty, left, free_space, right_nritems);
+ return __push_leaf_left(trans, root, path, min_data_size,
+ empty, left, free_space, right_nritems,
+ max_slot);
out:
btrfs_tree_unlock(left);
free_extent_buffer(left);
@@ -2855,6 +2874,64 @@ static noinline int copy_for_split(struct btrfs_trans_handle *trans,
}
/*
+ * double splits happen when we need to insert a big item in the middle
+ * of a leaf. A double split can leave us with 3 mostly empty leaves:
+ * leaf: [ slots 0 - N] [ our target ] [ N + 1 - total in leaf ]
+ * A B C
+ *
+ * We avoid this by trying to push the items on either side of our target
+ * into the adjacent leaves. If all goes well we can avoid the double split
+ * completely.
+ */
+static noinline int push_for_double_split(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ int data_size)
+{
+ int ret;
+ int progress = 0;
+ int slot;
+ u32 nritems;
+
+ slot = path->slots[0];
+
+ /*
+ * try to push all the items after our slot into the
+ * right leaf
+ */
+ ret = push_leaf_right(trans, root, path, 1, data_size, 0, slot);
+ if (ret < 0)
+ return ret;
+
+ if (ret == 0)
+ progress++;
+
+ nritems = btrfs_header_nritems(path->nodes[0]);
+ /*
+ * our goal is to get our slot at the start or end of a leaf. If
+ * we've done so we're done
+ */
+ if (path->slots[0] == 0 || path->slots[0] == nritems)
+ return 0;
+
+ if (btrfs_leaf_free_space(root, path->nodes[0]) >= data_size)
+ return 0;
+
+ /* try to push all the items before our slot into the next leaf */
+ slot = path->slots[0];
+ ret = push_leaf_left(trans, root, path, 1, data_size, 0, slot);
+ if (ret < 0)
+ return ret;
+
+ if (ret == 0)
+ progress++;
+
+ if (progress)
+ return 0;
+ return 1;
+}
+
+/*
* split the path's leaf in two, making sure there is at least data_size
* available for the resulting leaf level of the path.
*
@@ -2876,6 +2953,7 @@ static noinline int split_leaf(struct btrfs_trans_handle *trans,
int wret;
int split;
int num_doubles = 0;
+ int tried_avoid_double = 0;
l = path->nodes[0];
slot = path->slots[0];
@@ -2884,12 +2962,14 @@ static noinline int split_leaf(struct btrfs_trans_handle *trans,
return -EOVERFLOW;
/* first try to make some room by pushing left and right */
- if (data_size && ins_key->type != BTRFS_DIR_ITEM_KEY) {
- wret = push_leaf_right(trans, root, path, data_size, 0);
+ if (data_size) {
+ wret = push_leaf_right(trans, root, path, data_size,
+ data_size, 0, 0);
if (wret < 0)
return wret;
if (wret) {
- wret = push_leaf_left(trans, root, path, data_size, 0);
+ wret = push_leaf_left(trans, root, path, data_size,
+ data_size, 0, (u32)-1);
if (wret < 0)
return wret;
}
@@ -2923,6 +3003,8 @@ again:
if (mid != nritems &&
leaf_space_used(l, mid, nritems - mid) +
data_size > BTRFS_LEAF_DATA_SIZE(root)) {
+ if (data_size && !tried_avoid_double)
+ goto push_for_double;
split = 2;
}
}
@@ -2939,6 +3021,8 @@ again:
if (mid != nritems &&
leaf_space_used(l, mid, nritems - mid) +
data_size > BTRFS_LEAF_DATA_SIZE(root)) {
+ if (data_size && !tried_avoid_double)
+ goto push_for_double;
split = 2 ;
}
}
@@ -3019,6 +3103,13 @@ again:
}
return ret;
+
+push_for_double:
+ push_for_double_split(trans, root, path, data_size);
+ tried_avoid_double = 1;
+ if (btrfs_leaf_free_space(root, path->nodes[0]) >= data_size)
+ return 0;
+ goto again;
}
static noinline int setup_leaf_for_split(struct btrfs_trans_handle *trans,
@@ -3915,13 +4006,15 @@ int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
extent_buffer_get(leaf);
btrfs_set_path_blocking(path);
- wret = push_leaf_left(trans, root, path, 1, 1);
+ wret = push_leaf_left(trans, root, path, 1, 1,
+ 1, (u32)-1);
if (wret < 0 && wret != -ENOSPC)
ret = wret;
if (path->nodes[0] == leaf &&
btrfs_header_nritems(leaf)) {
- wret = push_leaf_right(trans, root, path, 1, 1);
+ wret = push_leaf_right(trans, root, path, 1,
+ 1, 1, 0);
if (wret < 0 && wret != -ENOSPC)
ret = wret;
}
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 4dbaf89b1337..9254b3d58dbe 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1458,7 +1458,7 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
*/
/* the destination must be opened for writing */
- if (!(file->f_mode & FMODE_WRITE))
+ if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND))
return -EINVAL;
ret = mnt_want_write(file->f_path.mnt);
@@ -1511,7 +1511,7 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
/* determine range to clone */
ret = -EINVAL;
- if (off >= src->i_size || off + len > src->i_size)
+ if (off + len > src->i_size || off + len < off)
goto out_unlock;
if (len == 0)
olen = len = src->i_size - off;
@@ -1578,6 +1578,7 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
u64 disko = 0, diskl = 0;
u64 datao = 0, datal = 0;
u8 comp;
+ u64 endoff;
size = btrfs_item_size_nr(leaf, slot);
read_extent_buffer(leaf, buf,
@@ -1712,9 +1713,18 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
btrfs_release_path(root, path);
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
- if (new_key.offset + datal > inode->i_size)
- btrfs_i_size_write(inode,
- new_key.offset + datal);
+
+ /*
+ * we round up to the block size at eof when
+ * determining which extents to clone above,
+ * but shouldn't round up the file size
+ */
+ endoff = new_key.offset + datal;
+ if (endoff > off+olen)
+ endoff = off+olen;
+ if (endoff > inode->i_size)
+ btrfs_i_size_write(inode, endoff);
+
BTRFS_I(inode)->flags = BTRFS_I(src)->flags;
ret = btrfs_update_inode(trans, root, inode);
BUG_ON(ret);

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