Cc: Chris Mason <chris.mason@xxxxxxxxxx>
Cc: linux-btrfs@xxxxxxxxxxxxxxx
Cc: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Nick Piggin <npiggin@xxxxxxx>
---
fs/btrfs/ctree.h | 1
fs/btrfs/inode.c | 132 +++++++++++++++++++++++++++++++++++--------------------
fs/btrfs/ioctl.c | 2
3 files changed, 86 insertions(+), 49 deletions(-)
Index: linux-2.6/fs/btrfs/inode.c
===================================================================
--- linux-2.6.orig/fs/btrfs/inode.c
+++ linux-2.6/fs/btrfs/inode.c
@@ -81,7 +81,6 @@ static unsigned char btrfs_type_by_mode[
[S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
};
-static void btrfs_truncate(struct inode *inode);
static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end);
static noinline int cow_file_range(struct inode *inode,
struct page *locked_page,
@@ -1990,7 +1989,7 @@ void btrfs_orphan_cleanup(struct btrfs_r
/* if we have links, this was a truncate, lets do that */
if (inode->i_nlink) {
nr_truncate++;
- btrfs_truncate(inode);
+ btrfs_truncate_blocks(inode, inode->i_size);
} else {
nr_unlink++;
}
@@ -2956,39 +2955,6 @@ int btrfs_cont_expand(struct inode *inod
return err;
}
-static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
-{
- struct inode *inode = dentry->d_inode;
- int err;
-
- err = inode_change_ok(inode, attr);
- if (err)
- return err;
-
- if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) {
- if (attr->ia_size > inode->i_size) {
- err = btrfs_cont_expand(inode, attr->ia_size);
- if (err)
- return err;
- } else if (inode->i_size > 0 &&
- attr->ia_size == 0) {
-
- /* we're truncating a file that used to have good
- * data down to zero. Make sure it gets into
- * the ordered flush list so that any new writes
- * get down to disk quickly.
- */
- BTRFS_I(inode)->ordered_data_close = 1;
- }
- }
-
- err = inode_setattr(inode, attr);
-
- if (!err && ((attr->ia_valid & ATTR_MODE)))
- err = btrfs_acl_chmod(inode);
- return err;
-}
-
void btrfs_delete_inode(struct inode *inode)
{
struct btrfs_trans_handle *trans;
@@ -4438,7 +4404,7 @@ static void btrfs_invalidatepage(struct
*
* We are not allowed to take the i_mutex here so we have to play games to
* protect against truncate races as the page could now be beyond EOF. Because
- * vmtruncate() writes the inode size before removing pages, once we have the
+ * btrfs_setsize() writes the inode size before removing pages, once we have the
* page lock we can determine safely if the page is beyond EOF. If it is not
* beyond EOF, then the page is guaranteed safe against truncation until we
* unlock the page.
@@ -4524,7 +4490,7 @@ out:
return ret;
}
-static void btrfs_truncate(struct inode *inode)
+static void __btrfs_truncate_blocks(struct inode *inode, loff_t offset)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
int ret;
@@ -4532,13 +4498,8 @@ static void btrfs_truncate(struct inode
unsigned long nr;
u64 mask = root->sectorsize - 1;
- if (!S_ISREG(inode->i_mode))
- return;
- if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
- return;
-
- btrfs_truncate_page(inode->i_mapping, inode->i_size);
- btrfs_wait_ordered_range(inode, inode->i_size & (~mask), (u64)-1);
+ btrfs_truncate_page(inode->i_mapping, offset);
+ btrfs_wait_ordered_range(inode, offset & (~mask), (u64)-1);
trans = btrfs_start_transaction(root, 1);
@@ -4559,17 +4520,17 @@ static void btrfs_truncate(struct inode
* using truncate to replace the contents of the file will
* end up with a zero length file after a crash.
*/
- if (inode->i_size == 0 && BTRFS_I(inode)->ordered_data_close)
+ if (offset == 0 && BTRFS_I(inode)->ordered_data_close)
btrfs_add_ordered_operation(trans, root, inode);
btrfs_set_trans_block_group(trans, inode);
- btrfs_i_size_write(inode, inode->i_size);
+ btrfs_i_size_write(inode, offset);
ret = btrfs_orphan_add(trans, inode);
if (ret)
goto out;
/* FIXME, add redo link to tree so we don't leak on crash */
- ret = btrfs_truncate_inode_items(trans, root, inode, inode->i_size,
+ ret = btrfs_truncate_inode_items(trans, root, inode, offset,
BTRFS_EXTENT_DATA_KEY);
btrfs_update_inode(trans, root, inode);
@@ -4583,6 +4544,81 @@ out:
btrfs_btree_balance_dirty(root, nr);
}
+void btrfs_truncate_blocks(struct inode *inode, loff_t offset)
+{
+ if (!S_ISREG(inode->i_mode))
+ return;
+ /* XXX: should allow IS_APPEND and IS_IMMUTABLE files to have
+ * blocks trimmed past i_size */
+ if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
+ return;
+
+ __btrfs_truncate_blocks(inode, offset);
+ mark_inode_dirty(inode);
+}
+
+static int btrfs_setsize(struct inode *inode, loff_t newsize)
+{
+ int error;
+ loff_t oldsize;
+
+ if (!S_ISREG(inode->i_mode))
+ return -EINVAL;
+ if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
+ return -EPERM;
+
+ error = inode_newsize_ok(inode, newsize);
+ if (error)
+ return error;
+
+ oldsize = inode->i_size;
+ __btrfs_truncate_blocks(inode, newsize);
+ truncate_pagecache(inode, oldsize, newsize);
+
+ return error;
+}
+
+static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
+{
+ struct inode *inode = dentry->d_inode;
+ int err;
+
+ err = inode_change_ok(inode, attr);
+ if (err)
+ return err;
+
+ if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) {
+ loff_t newsize = attr->ia_size;
+
+ if (newsize > inode->i_size) {
+ err = btrfs_cont_expand(inode, newsize);
+ if (err)
+ return err;
+ } else if (inode->i_size > 0 &&
+ newsize == 0) {
+
+ /* we're truncating a file that used to have good
+ * data down to zero. Make sure it gets into
+ * the ordered flush list so that any new writes
+ * get down to disk quickly.
+ */
+ BTRFS_I(inode)->ordered_data_close = 1;
+ }
+
+ err = btrfs_setsize(inode, newsize);
+ if (err)
+ return err;
+ }
+
+ generic_setattr(inode, attr);
+
+ if ((attr->ia_valid & ATTR_MODE))
+ err = btrfs_acl_chmod(inode);
+ mark_inode_dirty(inode);
+
+ return err;
+}
+
/*
* create a new subvolume directory/inode (helper for the ioctl).
*/
@@ -5272,7 +5308,7 @@ static struct address_space_operations b
};
static struct inode_operations btrfs_file_inode_operations = {
- .truncate = btrfs_truncate,
+ .new_truncate = 1,
.getattr = btrfs_getattr,
.setattr = btrfs_setattr,
.setxattr = btrfs_setxattr,
Index: linux-2.6/fs/btrfs/ioctl.c
===================================================================
--- linux-2.6.orig/fs/btrfs/ioctl.c
+++ linux-2.6/fs/btrfs/ioctl.c
@@ -1148,7 +1148,7 @@ out:
btrfs_end_transaction(trans, root);
unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
if (ret)
- vmtruncate(inode, 0);
+ btrfs_truncate_blocks(inode, 0);
out_unlock:
mutex_unlock(&src->i_mutex);
mutex_unlock(&inode->i_mutex);
Index: linux-2.6/fs/btrfs/ctree.h
===================================================================
--- linux-2.6.orig/fs/btrfs/ctree.h
+++ linux-2.6/fs/btrfs/ctree.h
@@ -2275,6 +2275,7 @@ int btrfs_orphan_add(struct btrfs_trans_
int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode);
void btrfs_orphan_cleanup(struct btrfs_root *root);
int btrfs_cont_expand(struct inode *inode, loff_t size);
+void btrfs_truncate_blocks(struct inode *inode, loff_t offset);
/* ioctl.c */
long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
--
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