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-rw-r--r--fs/btrfs/super.c213
1 files changed, 181 insertions, 32 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 5b87c4e9d49..0eb64d6eaf9 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -36,6 +36,13 @@ static struct address_space_operations btrfs_aops;
static struct address_space_operations btrfs_symlink_aops;
static struct file_operations btrfs_file_operations;
+static int drop_extents(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct inode *inode,
+ u64 start, u64 end, u64 *hint_block);
+static int btrfs_get_block(struct inode *inode, sector_t iblock,
+ struct buffer_head *result, int create);
+
static void btrfs_read_locked_inode(struct inode *inode)
{
struct btrfs_path *path;
@@ -381,10 +388,12 @@ static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
struct btrfs_disk_key *found_key;
u32 found_type;
struct btrfs_leaf *leaf;
- struct btrfs_file_extent_item *fi = NULL;
+ struct btrfs_file_extent_item *fi;
u64 extent_start = 0;
u64 extent_num_blocks = 0;
+ u64 item_end = 0;
int found_extent;
+ int del_item;
path = btrfs_alloc_path();
BUG_ON(!path);
@@ -394,6 +403,7 @@ static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
key.flags = (u32)-1;
while(1) {
btrfs_init_path(path);
+ fi = NULL;
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret < 0) {
goto error;
@@ -413,16 +423,52 @@ static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
found_type != BTRFS_DIR_INDEX_KEY &&
found_type != BTRFS_EXTENT_DATA_KEY)
break;
- if (btrfs_disk_key_offset(found_key) < inode->i_size)
- break;
- found_extent = 0;
- if (btrfs_disk_key_type(found_key) == BTRFS_EXTENT_DATA_KEY) {
+ item_end = btrfs_disk_key_offset(found_key);
+ if (found_type == BTRFS_EXTENT_DATA_KEY) {
fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
path->slots[0],
struct btrfs_file_extent_item);
if (btrfs_file_extent_type(fi) !=
BTRFS_FILE_EXTENT_INLINE) {
- u64 num_dec;
+ item_end += btrfs_file_extent_num_blocks(fi) <<
+ inode->i_blkbits;
+ }
+ }
+ if (found_type == BTRFS_CSUM_ITEM_KEY) {
+ ret = btrfs_csum_truncate(trans, root, path,
+ inode->i_size);
+ BUG_ON(ret);
+ }
+ if (item_end < inode->i_size) {
+ if (found_type) {
+ btrfs_set_key_type(&key, found_type - 1);
+ continue;
+ }
+ break;
+ }
+ if (btrfs_disk_key_offset(found_key) >= inode->i_size)
+ del_item = 1;
+ else
+ del_item = 0;
+ found_extent = 0;
+
+ if (found_type == BTRFS_EXTENT_DATA_KEY &&
+ btrfs_file_extent_type(fi) !=
+ BTRFS_FILE_EXTENT_INLINE) {
+ u64 num_dec;
+ if (!del_item) {
+ u64 orig_num_blocks =
+ btrfs_file_extent_num_blocks(fi);
+ extent_num_blocks = inode->i_size -
+ btrfs_disk_key_offset(found_key) +
+ root->blocksize - 1;
+ extent_num_blocks >>= inode->i_blkbits;
+ btrfs_set_file_extent_num_blocks(fi,
+ extent_num_blocks);
+ inode->i_blocks -= (orig_num_blocks -
+ extent_num_blocks) << 3;
+ mark_buffer_dirty(path->nodes[0]);
+ } else {
extent_start =
btrfs_file_extent_disk_blocknr(fi);
extent_num_blocks =
@@ -435,8 +481,12 @@ static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
}
}
}
- ret = btrfs_del_item(trans, root, path);
- BUG_ON(ret);
+ if (del_item) {
+ ret = btrfs_del_item(trans, root, path);
+ BUG_ON(ret);
+ } else {
+ break;
+ }
btrfs_release_path(root, path);
if (found_extent) {
ret = btrfs_free_extent(trans, root, extent_start,
@@ -452,6 +502,68 @@ error:
return ret;
}
+static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
+{
+ struct inode *inode = mapping->host;
+ unsigned blocksize = 1 << inode->i_blkbits;
+ pgoff_t index = from >> PAGE_CACHE_SHIFT;
+ unsigned offset = from & (PAGE_CACHE_SIZE-1);
+ struct page *page;
+ char *kaddr;
+ int ret = 0;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ u64 alloc_hint;
+ struct btrfs_key ins;
+ struct btrfs_trans_handle *trans;
+
+ if ((offset & (blocksize - 1)) == 0)
+ goto out;
+
+ ret = -ENOMEM;
+ page = grab_cache_page(mapping, index);
+ if (!page)
+ goto out;
+
+ if (!PageUptodate(page)) {
+ ret = mpage_readpage(page, btrfs_get_block);
+ lock_page(page);
+ if (!PageUptodate(page)) {
+ ret = -EIO;
+ goto out;
+ }
+ }
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ btrfs_set_trans_block_group(trans, inode);
+
+ ret = drop_extents(trans, root, inode, page->index << PAGE_CACHE_SHIFT,
+ (page->index + 1) << PAGE_CACHE_SHIFT, &alloc_hint);
+ BUG_ON(ret);
+ ret = btrfs_alloc_extent(trans, root, inode->i_ino, 1,
+ alloc_hint, (u64)-1, &ins, 1);
+ BUG_ON(ret);
+ ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
+ page->index << PAGE_CACHE_SHIFT,
+ ins.objectid, 1, 1);
+ BUG_ON(ret);
+ SetPageChecked(page);
+ kaddr = kmap(page);
+ memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
+ flush_dcache_page(page);
+ btrfs_csum_file_block(trans, root, inode->i_ino,
+ page->index << PAGE_CACHE_SHIFT,
+ kaddr, PAGE_CACHE_SIZE);
+ kunmap(page);
+ btrfs_end_transaction(trans, root);
+ mutex_unlock(&root->fs_info->fs_mutex);
+
+ set_page_dirty(page);
+ unlock_page(page);
+ page_cache_release(page);
+out:
+ return ret;
+}
+
static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = dentry->d_inode;
@@ -469,8 +581,11 @@ static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
u64 pos = (inode->i_size + mask) & ~mask;
u64 hole_size;
- if (attr->ia_size < pos)
+ if (attr->ia_size <= pos)
goto out;
+
+ btrfs_truncate_page(inode->i_mapping, inode->i_size);
+
hole_size = (attr->ia_size - pos + mask) & ~mask;
hole_size >>= inode->i_blkbits;
@@ -483,10 +598,9 @@ static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
btrfs_end_transaction(trans, root);
mutex_unlock(&root->fs_info->fs_mutex);
}
-
+out:
err = inode_setattr(inode, attr);
-out:
return err;
}
static void btrfs_delete_inode(struct inode *inode)
@@ -1161,17 +1275,30 @@ static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
u64 extent_end = 0;
u64 objectid = inode->i_ino;
u32 found_type;
+ u64 alloc_hint = 0;
struct btrfs_path *path;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_file_extent_item *item;
struct btrfs_leaf *leaf;
struct btrfs_disk_key *found_key;
+ struct btrfs_trans_handle *trans = NULL;
path = btrfs_alloc_path();
BUG_ON(!path);
btrfs_init_path(path);
if (create) {
WARN_ON(1);
+ /* this almost but not quite works */
+ trans = btrfs_start_transaction(root, 1);
+ if (!trans) {
+ err = -ENOMEM;
+ goto out;
+ }
+ ret = drop_extents(trans, root, inode,
+ iblock << inode->i_blkbits,
+ (iblock + 1) << inode->i_blkbits,
+ &alloc_hint);
+ BUG_ON(ret);
}
ret = btrfs_lookup_file_extent(NULL, root, path,
@@ -1185,7 +1312,7 @@ static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
if (ret != 0) {
if (path->slots[0] == 0) {
btrfs_release_path(root, path);
- goto out;
+ goto not_found;
}
path->slots[0]--;
}
@@ -1203,7 +1330,7 @@ static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
found_type != BTRFS_EXTENT_DATA_KEY) {
extent_end = 0;
extent_start = 0;
- goto out;
+ goto not_found;
}
found_type = btrfs_file_extent_type(item);
extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key);
@@ -1211,7 +1338,7 @@ static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
extent_start = extent_start >> inode->i_blkbits;
extent_end = extent_start + btrfs_file_extent_num_blocks(item);
err = 0;
- if (blocknr == 0)
+ if (btrfs_file_extent_disk_blocknr(item) == 0)
goto out;
if (iblock >= extent_start && iblock < extent_end) {
btrfs_map_bh_to_logical(root, result, blocknr +
@@ -1227,7 +1354,7 @@ static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
extent_end = (extent_start + size) >> inode->i_blkbits;
extent_start >>= inode->i_blkbits;
if (iblock < extent_start || iblock > extent_end) {
- goto out;
+ goto not_found;
}
ptr = btrfs_file_extent_inline_start(item);
map = kmap(result->b_page);
@@ -1239,7 +1366,24 @@ static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
SetPageChecked(result->b_page);
btrfs_map_bh_to_logical(root, result, 0);
}
+not_found:
+ if (create) {
+ struct btrfs_key ins;
+ ret = btrfs_alloc_extent(trans, root, inode->i_ino,
+ 1, alloc_hint, (u64)-1,
+ &ins, 1);
+ BUG_ON(ret);
+ ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
+ iblock << inode->i_blkbits,
+ ins.objectid, ins.offset,
+ ins.offset);
+ BUG_ON(ret);
+ SetPageChecked(result->b_page);
+ btrfs_map_bh_to_logical(root, result, ins.objectid);
+ }
out:
+ if (trans)
+ err = btrfs_end_transaction(trans, root);
btrfs_free_path(path);
return err;
}
@@ -1258,7 +1402,7 @@ static int btrfs_get_block(struct inode *inode, sector_t iblock,
static int btrfs_prepare_write(struct file *file, struct page *page,
unsigned from, unsigned to)
{
- return nobh_prepare_write(page, from, to, btrfs_get_block);
+ return block_prepare_write(page, from, to, btrfs_get_block);
}
static void btrfs_write_super(struct super_block *sb)
@@ -1500,12 +1644,13 @@ static void btrfs_truncate(struct inode *inode)
if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
return;
- nobh_truncate_page(inode->i_mapping, inode->i_size);
+ btrfs_truncate_page(inode->i_mapping, inode->i_size);
- /* FIXME, add redo link to tree so we don't leak on crash */
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
btrfs_set_trans_block_group(trans, inode);
+
+ /* FIXME, add redo link to tree so we don't leak on crash */
ret = btrfs_truncate_in_trans(trans, root, inode);
BUG_ON(ret);
btrfs_update_inode(trans, root, inode);
@@ -1515,10 +1660,6 @@ static void btrfs_truncate(struct inode *inode)
btrfs_btree_balance_dirty(root);
}
-/*
- * Make sure any changes to nobh_commit_write() are reflected in
- * nobh_truncate_page(), since it doesn't call commit_write().
- */
static int btrfs_commit_write(struct file *file, struct page *page,
unsigned from, unsigned to)
{
@@ -1528,6 +1669,7 @@ static int btrfs_commit_write(struct file *file, struct page *page,
SetPageUptodate(page);
bh = page_buffers(page);
+ set_buffer_uptodate(bh);
if (buffer_mapped(bh) && bh->b_blocknr != 0) {
set_page_dirty(page);
}
@@ -1972,8 +2114,7 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
first_index = pos >> PAGE_CACHE_SHIFT;
last_index = (pos + count) >> PAGE_CACHE_SHIFT;
- if ((first_index << PAGE_CACHE_SHIFT) < inode->i_size &&
- (pos & (PAGE_CACHE_SIZE - 1))) {
+ if ((pos & (PAGE_CACHE_SIZE - 1))) {
pinned[0] = grab_cache_page(inode->i_mapping, first_index);
if (!PageUptodate(pinned[0])) {
ret = mpage_readpage(pinned[0], btrfs_get_block);
@@ -1983,10 +2124,7 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
unlock_page(pinned[0]);
}
}
- if (first_index != last_index &&
- (last_index << PAGE_CACHE_SHIFT) < inode->i_size &&
- pos + count < inode->i_size &&
- (count & (PAGE_CACHE_SIZE - 1))) {
+ if ((pos + count) & (PAGE_CACHE_SIZE - 1)) {
pinned[1] = grab_cache_page(inode->i_mapping, last_index);
if (!PageUptodate(pinned[1])) {
ret = mpage_readpage(pinned[1], btrfs_get_block);
@@ -2110,23 +2248,34 @@ static int btrfs_read_actor(read_descriptor_t *desc, struct page *page,
if (!PageChecked(page)) {
/* FIXME, do it per block */
struct btrfs_root *root = BTRFS_I(inode)->root;
+ int ret;
+ struct buffer_head *bh;
+
+ if (page_has_buffers(page)) {
+ bh = page_buffers(page);
+ if (!buffer_mapped(bh)) {
+ SetPageChecked(page);
+ goto checked;
+ }
+ }
- int ret = btrfs_csum_verify_file_block(root,
+ ret = btrfs_csum_verify_file_block(root,
page->mapping->host->i_ino,
page->index << PAGE_CACHE_SHIFT,
kmap(page), PAGE_CACHE_SIZE);
if (ret) {
if (ret != -ENOENT) {
- printk("failed to verify ino %lu page %lu\n",
+ printk("failed to verify ino %lu page %lu ret %d\n",
page->mapping->host->i_ino,
- page->index);
- memset(page_address(page), 0, PAGE_CACHE_SIZE);
+ page->index, ret);
+ memset(page_address(page), 1, PAGE_CACHE_SIZE);
flush_dcache_page(page);
}
}
SetPageChecked(page);
kunmap(page);
}
+checked:
/*
* Faults on the destination of a read are common, so do it before
* taking the kmap.
generated by cgit (git 2.34.1) at 2024-11-10 13:54:28 +0000