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-rw-r--r--fs/btrfs/ctree.h35
-rw-r--r--fs/btrfs/disk-io.c6
-rw-r--r--fs/btrfs/extent-tree.c5
-rw-r--r--fs/btrfs/file-item.c1
-rw-r--r--fs/btrfs/super.c553
5 files changed, 484 insertions, 116 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 8a329d3..f180000 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -73,6 +73,9 @@ struct btrfs_header {
(sizeof(struct btrfs_disk_key) + sizeof(u64)))
#define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
#define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
+#define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
+ sizeof(struct btrfs_item) - \
+ sizeof(struct btrfs_file_extent_item))
struct buffer_head;
/*
@@ -204,8 +207,12 @@ struct btrfs_root_item {
__le32 refs;
} __attribute__ ((__packed__));
+#define BTRFS_FILE_EXTENT_REG 0
+#define BTRFS_FILE_EXTENT_INLINE 1
+
struct btrfs_file_extent_item {
__le64 generation;
+ u8 type;
/*
* disk space consumed by the extent, checksum blocks are included
* in these numbers
@@ -862,6 +869,34 @@ static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
return (u8 *)l->items;
}
+static inline int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
+{
+ return e->type;
+}
+static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
+ u8 val)
+{
+ e->type = val;
+}
+
+static inline char *btrfs_file_extent_inline_start(struct
+ btrfs_file_extent_item *e)
+{
+ return (char *)(&e->disk_blocknr);
+}
+
+static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
+{
+ return (unsigned long)(&((struct
+ btrfs_file_extent_item *)NULL)->disk_blocknr) + datasize;
+}
+
+static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
+{
+ struct btrfs_file_extent_item *fe = NULL;
+ return btrfs_item_size(e) - (unsigned long)(&fe->disk_blocknr);
+}
+
static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
*e)
{
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index a2a3f52..11e17a2 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -108,6 +108,12 @@ int btrfs_map_bh_to_logical(struct btrfs_root *root, struct buffer_head *bh,
int ret;
+ if (logical == 0) {
+ bh->b_bdev = NULL;
+ bh->b_blocknr = 0;
+ set_buffer_mapped(bh);
+ return 0;
+ }
root = root->fs_info->dev_root;
ret = radix_tree_gang_lookup(&root->fs_info->dev_radix,
(void **)lookup,
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index cb04a70..b2faad3 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -111,6 +111,9 @@ int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
continue;
fi = btrfs_item_ptr(buf_leaf, i,
struct btrfs_file_extent_item);
+ if (btrfs_file_extent_type(fi) ==
+ BTRFS_FILE_EXTENT_INLINE)
+ continue;
ret = btrfs_inc_extent_ref(trans, root,
btrfs_file_extent_disk_blocknr(fi),
btrfs_file_extent_disk_num_blocks(fi));
@@ -539,6 +542,8 @@ static int drop_leaf_ref(struct btrfs_trans_handle *trans,
if (btrfs_disk_key_type(key) != BTRFS_EXTENT_DATA_KEY)
continue;
fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item);
+ if (btrfs_file_extent_type(fi) == BTRFS_FILE_EXTENT_INLINE)
+ continue;
/*
* FIXME make sure to insert a trans record that
* repeats the snapshot del on crash
diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index 8cc3c1d..10e4cf0 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -34,6 +34,7 @@ int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
btrfs_set_file_extent_offset(item, 0);
btrfs_set_file_extent_num_blocks(item, num_blocks);
btrfs_set_file_extent_generation(item, trans->transid);
+ btrfs_set_file_extent_type(item, BTRFS_FILE_EXTENT_REG);
btrfs_mark_buffer_dirty(path->nodes[0]);
btrfs_release_path(root, path);
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 583cd87..1b286bb 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -317,19 +317,22 @@ static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
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) {
fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
path->slots[0],
struct btrfs_file_extent_item);
- extent_start = btrfs_file_extent_disk_blocknr(fi);
- extent_num_blocks =
- btrfs_file_extent_disk_num_blocks(fi);
- /* FIXME blocksize != 4096 */
- inode->i_blocks -=
- btrfs_file_extent_num_blocks(fi) << 3;
- found_extent = 1;
- } else {
- found_extent = 0;
+ if (btrfs_file_extent_type(fi) !=
+ BTRFS_FILE_EXTENT_INLINE) {
+ extent_start =
+ btrfs_file_extent_disk_blocknr(fi);
+ extent_num_blocks =
+ btrfs_file_extent_disk_num_blocks(fi);
+ /* FIXME blocksize != 4096 */
+ inode->i_blocks -=
+ btrfs_file_extent_num_blocks(fi) << 3;
+ found_extent = 1;
+ }
}
ret = btrfs_del_item(trans, root, path);
BUG_ON(ret);
@@ -1010,9 +1013,9 @@ static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
u64 extent_start = 0;
u64 extent_end = 0;
u64 objectid = inode->i_ino;
+ u32 found_type;
struct btrfs_path *path;
struct btrfs_root *root = BTRFS_I(inode)->root;
- struct btrfs_trans_handle *trans = NULL;
struct btrfs_file_extent_item *item;
struct btrfs_leaf *leaf;
struct btrfs_disk_key *found_key;
@@ -1021,13 +1024,12 @@ static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
BUG_ON(!path);
btrfs_init_path(path);
if (create) {
- trans = btrfs_start_transaction(root, 1);
WARN_ON(1);
}
- ret = btrfs_lookup_file_extent(trans, root, path,
+ ret = btrfs_lookup_file_extent(NULL, root, path,
inode->i_ino,
- iblock << inode->i_blkbits, create);
+ iblock << inode->i_blkbits, 0);
if (ret < 0) {
err = ret;
goto out;
@@ -1036,7 +1038,7 @@ 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 allocate;
+ goto out;
}
path->slots[0]--;
}
@@ -1047,73 +1049,51 @@ static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
blocknr = btrfs_file_extent_disk_blocknr(item);
blocknr += btrfs_file_extent_offset(item);
- /* exact match found, use it, FIXME, deal with extents
- * other than the page size
- */
- if (0 && ret == 0) {
- err = 0;
- if (create &&
- btrfs_file_extent_generation(item) != trans->transid) {
- struct btrfs_key ins;
- ret = btrfs_alloc_extent(trans, root, 1,
- blocknr, (u64)-1, &ins);
- BUG_ON(ret);
- btrfs_set_file_extent_disk_blocknr(item, ins.objectid);
- mark_buffer_dirty(path->nodes[0]);
- ret = btrfs_free_extent(trans, root,
- blocknr, 1, 0);
- BUG_ON(ret);
- blocknr = ins.objectid;
-
- }
- btrfs_map_bh_to_logical(root, result, blocknr);
- goto out;
- }
-
/* are we inside the extent that was found? */
found_key = &leaf->items[path->slots[0]].key;
+ found_type = btrfs_disk_key_type(found_key);
if (btrfs_disk_key_objectid(found_key) != objectid ||
- btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) {
+ found_type != BTRFS_EXTENT_DATA_KEY) {
extent_end = 0;
extent_start = 0;
btrfs_release_path(root, path);
- goto allocate;
- }
-
- extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key);
- extent_start = extent_start >> inode->i_blkbits;
- extent_end = extent_start + btrfs_file_extent_num_blocks(item);
- if (iblock >= extent_start && iblock < extent_end) {
- err = 0;
- btrfs_map_bh_to_logical(root, result, blocknr + iblock -
- extent_start);
- goto out;
- }
-allocate:
- /* ok, create a new extent */
- if (!create) {
- err = 0;
goto out;
}
-#if 0
- ret = btrfs_alloc_file_extent(trans, root, objectid,
- iblock << inode->i_blkbits,
- 1, extent_end, &blocknr);
- if (ret) {
- err = ret;
- goto out;
+ found_type = btrfs_file_extent_type(item);
+ extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key);
+ if (found_type == BTRFS_FILE_EXTENT_REG) {
+ extent_start = extent_start >> inode->i_blkbits;
+ extent_end = extent_start + btrfs_file_extent_num_blocks(item);
+ if (iblock >= extent_start && iblock < extent_end) {
+ err = 0;
+ btrfs_map_bh_to_logical(root, result, blocknr +
+ iblock - extent_start);
+ goto out;
+ }
+ } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
+ char *ptr;
+ char *map;
+ u32 size;
+ size = btrfs_file_extent_inline_len(leaf->items +
+ path->slots[0]);
+ extent_end = (extent_start + size) >> inode->i_blkbits;
+ extent_start >>= inode->i_blkbits;
+ if (iblock < extent_start || iblock > extent_end) {
+ goto out;
+ }
+ ptr = btrfs_file_extent_inline_start(item);
+ map = kmap(result->b_page);
+ memcpy(map, ptr, size);
+ memset(map + size, 0, PAGE_CACHE_SIZE - size);
+ flush_dcache_page(result->b_page);
+ kunmap(result->b_page);
+ set_buffer_uptodate(result);
+ SetPageChecked(result->b_page);
+ btrfs_map_bh_to_logical(root, result, 0);
}
- inode->i_blocks += inode->i_sb->s_blocksize >> 9;
- set_buffer_new(result);
- map_bh(result, inode->i_sb, blocknr);
-
- btrfs_map_bh_to_logical(root, result, blocknr);
-#endif
out:
btrfs_release_path(root, path);
btrfs_free_path(path);
- if (trans)
- btrfs_end_transaction(trans, root);
return err;
}
@@ -1124,7 +1104,6 @@ static int btrfs_get_block(struct inode *inode, sector_t iblock,
struct btrfs_root *root = BTRFS_I(inode)->root;
mutex_lock(&root->fs_info->fs_mutex);
err = btrfs_get_block_lock(inode, iblock, result, create);
- // err = btrfs_get_block_inline(inode, iblock, result, create);
mutex_unlock(&root->fs_info->fs_mutex);
return err;
}
@@ -1134,11 +1113,6 @@ static int btrfs_prepare_write(struct file *file, struct page *page,
{
return nobh_prepare_write(page, from, to, btrfs_get_block);
}
-static int btrfs_commit_write(struct file *file, struct page *page,
- unsigned from, unsigned to)
-{
- return nobh_commit_write(file, page, from, to);
-}
static void btrfs_write_super(struct super_block *sb)
{
@@ -1150,9 +1124,227 @@ static int btrfs_readpage(struct file *file, struct page *page)
return mpage_readpage(page, btrfs_get_block);
}
+/*
+ * While block_write_full_page is writing back the dirty buffers under
+ * the page lock, whoever dirtied the buffers may decide to clean them
+ * again at any time. We handle that by only looking at the buffer
+ * state inside lock_buffer().
+ *
+ * If block_write_full_page() is called for regular writeback
+ * (wbc->sync_mode == WB_SYNC_NONE) then it will redirty a page which has a
+ * locked buffer. This only can happen if someone has written the buffer
+ * directly, with submit_bh(). At the address_space level PageWriteback
+ * prevents this contention from occurring.
+ */
+static int __btrfs_write_full_page(struct inode *inode, struct page *page,
+ struct writeback_control *wbc)
+{
+ int err;
+ sector_t block;
+ sector_t last_block;
+ struct buffer_head *bh, *head;
+ const unsigned blocksize = 1 << inode->i_blkbits;
+ int nr_underway = 0;
+
+ BUG_ON(!PageLocked(page));
+
+ last_block = (i_size_read(inode) - 1) >> inode->i_blkbits;
+
+ if (!page_has_buffers(page)) {
+ create_empty_buffers(page, blocksize,
+ (1 << BH_Dirty)|(1 << BH_Uptodate));
+ }
+
+ /*
+ * Be very careful. We have no exclusion from __set_page_dirty_buffers
+ * here, and the (potentially unmapped) buffers may become dirty at
+ * any time. If a buffer becomes dirty here after we've inspected it
+ * then we just miss that fact, and the page stays dirty.
+ *
+ * Buffers outside i_size may be dirtied by __set_page_dirty_buffers;
+ * handle that here by just cleaning them.
+ */
+
+ block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
+ head = page_buffers(page);
+ bh = head;
+
+ /*
+ * Get all the dirty buffers mapped to disk addresses and
+ * handle any aliases from the underlying blockdev's mapping.
+ */
+ do {
+ if (block > last_block) {
+ /*
+ * mapped buffers outside i_size will occur, because
+ * this page can be outside i_size when there is a
+ * truncate in progress.
+ */
+ /*
+ * The buffer was zeroed by block_write_full_page()
+ */
+ clear_buffer_dirty(bh);
+ set_buffer_uptodate(bh);
+ } else if (!buffer_mapped(bh) && buffer_dirty(bh)) {
+ WARN_ON(bh->b_size != blocksize);
+ err = btrfs_get_block(inode, block, bh, 0);
+ if (err)
+ goto recover;
+ if (buffer_new(bh)) {
+ /* blockdev mappings never come here */
+ clear_buffer_new(bh);
+ unmap_underlying_metadata(bh->b_bdev,
+ bh->b_blocknr);
+ }
+ }
+ bh = bh->b_this_page;
+ block++;
+ } while (bh != head);
+
+ do {
+ if (!buffer_mapped(bh))
+ continue;
+ /*
+ * If it's a fully non-blocking write attempt and we cannot
+ * lock the buffer then redirty the page. Note that this can
+ * potentially cause a busy-wait loop from pdflush and kswapd
+ * activity, but those code paths have their own higher-level
+ * throttling.
+ */
+ if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) {
+ lock_buffer(bh);
+ } else if (test_set_buffer_locked(bh)) {
+ redirty_page_for_writepage(wbc, page);
+ continue;
+ }
+ if (test_clear_buffer_dirty(bh) && bh->b_blocknr != 0) {
+ mark_buffer_async_write(bh);
+ } else {
+ unlock_buffer(bh);
+ }
+ } while ((bh = bh->b_this_page) != head);
+
+ /*
+ * The page and its buffers are protected by PageWriteback(), so we can
+ * drop the bh refcounts early.
+ */
+ BUG_ON(PageWriteback(page));
+ set_page_writeback(page);
+
+ do {
+ struct buffer_head *next = bh->b_this_page;
+ if (buffer_async_write(bh)) {
+ submit_bh(WRITE, bh);
+ nr_underway++;
+ }
+ bh = next;
+ } while (bh != head);
+ unlock_page(page);
+
+ err = 0;
+done:
+ if (nr_underway == 0) {
+ /*
+ * The page was marked dirty, but the buffers were
+ * clean. Someone wrote them back by hand with
+ * ll_rw_block/submit_bh. A rare case.
+ */
+ int uptodate = 1;
+ do {
+ if (!buffer_uptodate(bh)) {
+ uptodate = 0;
+ break;
+ }
+ bh = bh->b_this_page;
+ } while (bh != head);
+ if (uptodate)
+ SetPageUptodate(page);
+ end_page_writeback(page);
+ /*
+ * The page and buffer_heads can be released at any time from
+ * here on.
+ */
+ wbc->pages_skipped++; /* We didn't write this page */
+ }
+ return err;
+
+recover:
+ /*
+ * ENOSPC, or some other error. We may already have added some
+ * blocks to the file, so we need to write these out to avoid
+ * exposing stale data.
+ * The page is currently locked and not marked for writeback
+ */
+ bh = head;
+ /* Recovery: lock and submit the mapped buffers */
+ do {
+ if (buffer_mapped(bh) && buffer_dirty(bh)) {
+ lock_buffer(bh);
+ mark_buffer_async_write(bh);
+ } else {
+ /*
+ * The buffer may have been set dirty during
+ * attachment to a dirty page.
+ */
+ clear_buffer_dirty(bh);
+ }
+ } while ((bh = bh->b_this_page) != head);
+ SetPageError(page);
+ BUG_ON(PageWriteback(page));
+ set_page_writeback(page);
+ do {
+ struct buffer_head *next = bh->b_this_page;
+ if (buffer_async_write(bh)) {
+ clear_buffer_dirty(bh);
+ submit_bh(WRITE, bh);
+ nr_underway++;
+ }
+ bh = next;
+ } while (bh != head);
+ unlock_page(page);
+ goto done;
+}
+
+/*
+ * The generic ->writepage function for buffer-backed address_spaces
+ */
static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
{
- return nobh_writepage(page, btrfs_get_block, wbc);
+ struct inode * const inode = page->mapping->host;
+ loff_t i_size = i_size_read(inode);
+ const pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
+ unsigned offset;
+ void *kaddr;
+
+ /* Is the page fully inside i_size? */
+ if (page->index < end_index)
+ return __btrfs_write_full_page(inode, page, wbc);
+
+ /* Is the page fully outside i_size? (truncate in progress) */
+ offset = i_size & (PAGE_CACHE_SIZE-1);
+ if (page->index >= end_index+1 || !offset) {
+ /*
+ * The page may have dirty, unmapped buffers. For example,
+ * they may have been added in ext3_writepage(). Make them
+ * freeable here, so the page does not leak.
+ */
+ block_invalidatepage(page, 0);
+ unlock_page(page);
+ return 0; /* don't care */
+ }
+
+ /*
+ * The page straddles i_size. It must be zeroed out on each and every
+ * writepage invokation because it may be mmapped. "A file is mapped
+ * in multiples of the page size. For a file that is not a multiple of
+ * the page size, the remaining memory is zeroed when mapped, and
+ * writes to that region are not written out to the file."
+ */
+ kaddr = kmap_atomic(page, KM_USER0);
+ memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
+ flush_dcache_page(page);
+ kunmap_atomic(kaddr, KM_USER0);
+ return __btrfs_write_full_page(inode, page, wbc);
}
static void btrfs_truncate(struct inode *inode)
@@ -1179,6 +1371,29 @@ static void btrfs_truncate(struct inode *inode)
mark_inode_dirty(inode);
}
+/*
+ * 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)
+{
+ struct inode *inode = page->mapping->host;
+ struct buffer_head *bh;
+ loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
+
+ SetPageUptodate(page);
+ bh = page_buffers(page);
+ if (buffer_mapped(bh) && bh->b_blocknr != 0) {
+ set_page_dirty(page);
+ }
+ if (pos > inode->i_size) {
+ i_size_write(inode, pos);
+ mark_inode_dirty(inode);
+ }
+ return 0;
+}
+
static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes,
struct page **prepared_pages,
const char __user * buf)
@@ -1234,6 +1449,8 @@ static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
int ret;
int this_write;
struct inode *inode = file->f_path.dentry->d_inode;
+ struct buffer_head *bh;
+ struct btrfs_file_extent_item *ei;
for (i = 0; i < num_pages; i++) {
offset = pos & (PAGE_CACHE_SIZE -1);
@@ -1242,16 +1459,47 @@ static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
- btrfs_csum_file_block(trans, root, inode->i_ino,
+
+ bh = page_buffers(pages[i]);
+ if (buffer_mapped(bh) && bh->b_blocknr == 0) {
+ struct btrfs_key key;
+ struct btrfs_path *path;
+ char *ptr;
+ u32 datasize;
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ key.objectid = inode->i_ino;
+ key.offset = pages[i]->index << PAGE_CACHE_SHIFT;
+ key.flags = 0;
+ btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
+ BUG_ON(write_bytes >= PAGE_CACHE_SIZE);
+ datasize = offset +
+ btrfs_file_extent_calc_inline_size(write_bytes);
+ ret = btrfs_insert_empty_item(trans, root, path, &key,
+ datasize);
+ BUG_ON(ret);
+ ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
+ path->slots[0], struct btrfs_file_extent_item);
+ btrfs_set_file_extent_generation(ei, trans->transid);
+ btrfs_set_file_extent_type(ei,
+ BTRFS_FILE_EXTENT_INLINE);
+ ptr = btrfs_file_extent_inline_start(ei);
+ memcpy(ptr, bh->b_data, offset + write_bytes);
+ mark_buffer_dirty(path->nodes[0]);
+ btrfs_free_path(path);
+ } else {
+ btrfs_csum_file_block(trans, root, inode->i_ino,
pages[i]->index << PAGE_CACHE_SHIFT,
kmap(pages[i]), PAGE_CACHE_SIZE);
- kunmap(pages[i]);
+ kunmap(pages[i]);
+ }
SetPageChecked(pages[i]);
ret = btrfs_end_transaction(trans, root);
BUG_ON(ret);
mutex_unlock(&root->fs_info->fs_mutex);
- ret = nobh_commit_write(file, pages[i], offset,
+ ret = btrfs_commit_write(file, pages[i], offset,
offset + this_write);
pos += this_write;
if (ret) {
@@ -1275,12 +1523,16 @@ static int drop_extents(struct btrfs_trans_handle *trans,
struct btrfs_leaf *leaf;
int slot;
struct btrfs_file_extent_item *extent;
- u64 extent_end;
+ u64 extent_end = 0;
int keep;
struct btrfs_file_extent_item old;
struct btrfs_path *path;
u64 search_start = start;
int bookend;
+ int found_type;
+ int found_extent;
+ int found_inline;
+
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
@@ -1292,37 +1544,62 @@ static int drop_extents(struct btrfs_trans_handle *trans,
goto out;
if (ret > 0) {
if (path->slots[0] == 0) {
- ret = -ENOENT;
+ ret = 0;
goto out;
}
path->slots[0]--;
}
keep = 0;
bookend = 0;
+ found_extent = 0;
+ found_inline = 0;
+ extent = NULL;
leaf = btrfs_buffer_leaf(path->nodes[0]);
slot = path->slots[0];
btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key);
- extent = btrfs_item_ptr(leaf, slot,
- struct btrfs_file_extent_item);
- extent_end = key.offset +
- (btrfs_file_extent_num_blocks(extent) <<
- inode->i_blkbits);
if (key.offset >= end || key.objectid != inode->i_ino) {
ret = 0;
goto out;
}
- if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY)
+ if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) {
+ ret = 0;
+ goto out;
+ }
+ extent = btrfs_item_ptr(leaf, slot,
+ struct btrfs_file_extent_item);
+ found_type = btrfs_file_extent_type(extent);
+ if (found_type == BTRFS_FILE_EXTENT_REG) {
+ extent_end = key.offset +
+ (btrfs_file_extent_num_blocks(extent) <<
+ inode->i_blkbits);
+ found_extent = 1;
+ } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
+ found_inline = 1;
+ extent_end = key.offset +
+ btrfs_file_extent_inline_len(leaf->items + slot);
+ }
+
+ if (!found_extent && !found_inline) {
+ ret = 0;
goto out;
- if (search_start >= extent_end)
+ }
+
+ if (search_start >= extent_end) {
+ ret = 0;
goto out;
+ }
+
search_start = extent_end;
if (end < extent_end && end >= key.offset) {
- memcpy(&old, extent, sizeof(old));
- ret = btrfs_inc_extent_ref(trans, root,
- btrfs_file_extent_disk_blocknr(&old),
- btrfs_file_extent_disk_num_blocks(&old));
- BUG_ON(ret);
+ if (found_extent) {
+ memcpy(&old, extent, sizeof(old));
+ ret = btrfs_inc_extent_ref(trans, root,
+ btrfs_file_extent_disk_blocknr(&old),
+ btrfs_file_extent_disk_num_blocks(&old));
+ BUG_ON(ret);
+ }
+ WARN_ON(found_inline);
bookend = 1;
}
@@ -1332,25 +1609,45 @@ static int drop_extents(struct btrfs_trans_handle *trans,
/* truncate existing extent */
keep = 1;
WARN_ON(start & (root->blocksize - 1));
- new_num = (start - key.offset) >> inode->i_blkbits;
- old_num = btrfs_file_extent_num_blocks(extent);
- inode->i_blocks -= (old_num - new_num) << 3;
- btrfs_set_file_extent_num_blocks(extent, new_num);
- mark_buffer_dirty(path->nodes[0]);
+ if (found_extent) {
+ new_num = (start - key.offset) >>
+ inode->i_blkbits;
+ old_num = btrfs_file_extent_num_blocks(extent);
+ inode->i_blocks -= (old_num - new_num) << 3;
+ btrfs_set_file_extent_num_blocks(extent,
+ new_num);
+ mark_buffer_dirty(path->nodes[0]);
+ } else {
+ WARN_ON(1);
+ /*
+ ret = btrfs_truncate_item(trans, root, path,
+ start - key.offset);
+ BUG_ON(ret);
+ */
+ }
}
if (!keep) {
- u64 disk_blocknr;
- u64 disk_num_blocks;
- disk_blocknr = btrfs_file_extent_disk_blocknr(extent);
- disk_num_blocks =
- btrfs_file_extent_disk_num_blocks(extent);
+ u64 disk_blocknr = 0;
+ u64 disk_num_blocks = 0;
+ u64 extent_num_blocks = 0;
+ if (found_extent) {
+ disk_blocknr =
+ btrfs_file_extent_disk_blocknr(extent);
+ disk_num_blocks =
+ btrfs_file_extent_disk_num_blocks(extent);
+ extent_num_blocks =
+ btrfs_file_extent_num_blocks(extent);
+ }
ret = btrfs_del_item(trans, root, path);
BUG_ON(ret);
- inode->i_blocks -=
- btrfs_file_extent_num_blocks(extent) << 3;
btrfs_release_path(root, path);
- ret = btrfs_free_extent(trans, root, disk_blocknr,
- disk_num_blocks, 0);
+ if (found_extent) {
+ inode->i_blocks -=
+ btrfs_file_extent_num_blocks(extent) << 3;
+ ret = btrfs_free_extent(trans, root,
+ disk_blocknr,
+ disk_num_blocks, 0);
+ }
BUG_ON(ret);
if (!bookend && search_start >= end) {
@@ -1360,7 +1657,7 @@ static int drop_extents(struct btrfs_trans_handle *trans,
if (!bookend)
continue;
}
- if (bookend) {
+ if (bookend && found_extent) {
/* create bookend */
struct btrfs_key ins;
ins.objectid = inode->i_ino;
@@ -1390,6 +1687,8 @@ static int drop_extents(struct btrfs_trans_handle *trans,
btrfs_file_extent_num_blocks(&old) -
((end - key.offset) >> inode->i_blkbits));
+ btrfs_set_file_extent_type(extent,
+ BTRFS_FILE_EXTENT_REG);
btrfs_set_file_extent_generation(extent,
btrfs_file_extent_generation(&old));
btrfs_mark_buffer_dirty(path->nodes[0]);
@@ -1445,7 +1744,8 @@ static int prepare_pages(struct btrfs_root *root,
if (err)
goto failed_truncate;
bh = bh->b_this_page;
- alloc_extent_start++;
+ if (alloc_extent_start)
+ alloc_extent_start++;
} while (bh != head);
pos += this_write;
WARN_ON(this_write > write_bytes);
@@ -1543,12 +1843,20 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
start_pos,
(pos + count + root->blocksize -1) &
~((u64)root->blocksize - 1));
+ BUG_ON(ret);
}
- ret = btrfs_alloc_extent(trans, root, num_blocks, 1,
+ if (inode->i_size >= PAGE_CACHE_SIZE || pos + count < inode->i_size ||
+ pos + count - start_pos > BTRFS_MAX_INLINE_DATA_SIZE(root)) {
+ ret = btrfs_alloc_extent(trans, root, num_blocks, 1,
(u64)-1, &ins);
- BUG_ON(ret);
- ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
+ BUG_ON(ret);
+ ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
start_pos, ins.objectid, ins.offset);
+ BUG_ON(ret);
+ } else {
+ ins.offset = 0;
+ ins.objectid = 0;
+ }
BUG_ON(ret);
alloc_extent_start = ins.objectid;
ret = btrfs_end_transaction(trans, root);
@@ -1567,7 +1875,8 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
BUG_ON(ret);
/* FIXME blocks != pagesize */
- alloc_extent_start += num_pages;
+ if (alloc_extent_start)
+ alloc_extent_start += num_pages;
ret = btrfs_copy_from_user(pos, num_pages,
write_bytes, pages, buf);
BUG_ON(ret);
@@ -1779,10 +2088,11 @@ 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 = btrfs_csum_verify_file_block(root,
- page->mapping->host->i_ino,
- page->index << PAGE_CACHE_SHIFT,
- kmap(page), PAGE_CACHE_SIZE);
+ page->mapping->host->i_ino,
+ page->index << PAGE_CACHE_SHIFT,
+ kmap(page), PAGE_CACHE_SIZE);
if (ret) {
printk("failed to verify ino %lu page %lu\n",
page->mapping->host->i_ino,
@@ -2249,6 +2559,16 @@ static int btrfs_get_sb(struct file_system_type *fs_type,
btrfs_fill_super, mnt);
}
+
+static int btrfs_getattr(struct vfsmount *mnt,
+ struct dentry *dentry, struct kstat *stat)
+{
+ struct inode *inode = dentry->d_inode;
+ generic_fillattr(inode, stat);
+ stat->blksize = 256 * 1024;
+ return 0;
+}
+
static struct file_system_type btrfs_fs_type = {
.owner = THIS_MODULE,
.name = "btrfs",
@@ -2298,6 +2618,7 @@ static struct address_space_operations btrfs_aops = {
static struct inode_operations btrfs_file_inode_operations = {
.truncate = btrfs_truncate,
+ .getattr = btrfs_getattr,
};
static struct file_operations btrfs_file_operations = {
generated by cgit v0.10.2 at 2024-07-08 08:12:34 (GMT)