* Boston, MA 021110-1307, USA.
*/
-#include <linux/module.h>
#include <linux/buffer_head.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/writeback.h>
#include <linux/statfs.h>
#include <linux/compat.h>
+#include <linux/version.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
}
}
+static int insert_inline_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct inode *inode,
+ u64 offset, ssize_t size,
+ struct page *page, size_t page_offset)
+{
+ struct btrfs_key key;
+ struct btrfs_path *path;
+ char *ptr, *kaddr;
+ struct btrfs_file_extent_item *ei;
+ u32 datasize;
+ int err = 0;
+ int ret;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ btrfs_set_trans_block_group(trans, inode);
+
+ key.objectid = inode->i_ino;
+ key.offset = offset;
+ key.flags = 0;
+ btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
+ BUG_ON(size >= PAGE_CACHE_SIZE);
+ datasize = btrfs_file_extent_calc_inline_size(size);
+
+ ret = btrfs_insert_empty_item(trans, root, path, &key,
+ datasize);
+ if (ret) {
+ err = ret;
+ goto fail;
+ }
+ 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);
+
+ kaddr = kmap_atomic(page, KM_USER0);
+ btrfs_memcpy(root, path->nodes[0]->b_data,
+ ptr, kaddr + page_offset, size);
+ kunmap_atomic(kaddr, KM_USER0);
+ btrfs_mark_buffer_dirty(path->nodes[0]);
+fail:
+ btrfs_free_path(path);
+ return err;
+}
+
static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct file *file,
loff_t pos,
size_t write_bytes)
{
- int i;
- int offset;
int err = 0;
- int ret;
- int this_write;
+ int i;
struct inode *inode = file->f_path.dentry->d_inode;
- struct buffer_head *bh;
- struct btrfs_file_extent_item *ei;
+ struct extent_map *em;
+ struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
+ u64 hint_block;
+ u64 num_blocks;
+ u64 start_pos;
+ u64 end_of_last_block;
+ u64 end_pos = pos + write_bytes;
+ loff_t isize = i_size_read(inode);
- for (i = 0; i < num_pages; i++) {
- offset = pos & (PAGE_CACHE_SIZE -1);
- this_write = min((size_t)PAGE_CACHE_SIZE - offset, write_bytes);
- /* FIXME, one block at a time */
-
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- btrfs_set_trans_block_group(trans, inode);
-
- bh = page_buffers(pages[i]);
-
- if (buffer_mapped(bh) && bh->b_blocknr == 0) {
- struct btrfs_key key;
- struct btrfs_path *path;
- char *ptr, *kaddr;
- u32 datasize;
-
- /* create an inline extent, and copy the data in */
- 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);
- kaddr = kmap_atomic(bh->b_page, KM_USER0);
- btrfs_memcpy(root, path->nodes[0]->b_data,
- ptr, kaddr + bh_offset(bh),
- offset + write_bytes);
- kunmap_atomic(kaddr, KM_USER0);
- mark_buffer_dirty(path->nodes[0]);
- btrfs_free_path(path);
- } else if (buffer_mapped(bh)) {
- /* csum the file data */
- btrfs_csum_file_block(trans, root, inode->i_ino,
- pages[i]->index << PAGE_CACHE_SHIFT,
- kmap(pages[i]), PAGE_CACHE_SIZE);
- kunmap(pages[i]);
+ em = alloc_extent_map(GFP_NOFS);
+ if (!em)
+ return -ENOMEM;
+
+ em->bdev = inode->i_sb->s_bdev;
+
+ start_pos = pos & ~((u64)root->blocksize - 1);
+ num_blocks = (write_bytes + pos - start_pos + root->blocksize - 1) >>
+ inode->i_blkbits;
+
+ end_of_last_block = start_pos + (num_blocks << inode->i_blkbits) - 1;
+ lock_extent(em_tree, start_pos, end_of_last_block, GFP_NOFS);
+ mutex_lock(&root->fs_info->fs_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ if (!trans) {
+ err = -ENOMEM;
+ goto out_unlock;
+ }
+ btrfs_set_trans_block_group(trans, inode);
+ inode->i_blocks += num_blocks << 3;
+ hint_block = 0;
+
+ if ((end_of_last_block & 4095) == 0) {
+ printk("strange end of last %Lu %lu %Lu\n", start_pos, write_bytes, end_of_last_block);
+ }
+ set_extent_uptodate(em_tree, start_pos, end_of_last_block, GFP_NOFS);
+
+ /* FIXME...EIEIO, ENOSPC and more */
+
+ /* insert any holes we need to create */
+ if (inode->i_size < start_pos) {
+ u64 last_pos_in_file;
+ u64 hole_size;
+ u64 mask = root->blocksize - 1;
+ last_pos_in_file = (isize + mask) & ~mask;
+ hole_size = (start_pos - last_pos_in_file + mask) & ~mask;
+ hole_size >>= inode->i_blkbits;
+ if (last_pos_in_file < start_pos) {
+ err = btrfs_insert_file_extent(trans, root,
+ inode->i_ino,
+ last_pos_in_file,
+ 0, 0, hole_size);
}
- SetPageChecked(pages[i]);
- ret = btrfs_end_transaction(trans, root);
- BUG_ON(ret);
- mutex_unlock(&root->fs_info->fs_mutex);
-
- ret = btrfs_commit_write(file, pages[i], offset,
- offset + this_write);
- pos += this_write;
- if (ret) {
- err = ret;
+ if (err)
goto failed;
+ }
+
+ /*
+ * either allocate an extent for the new bytes or setup the key
+ * to show we are doing inline data in the extent
+ */
+ if (isize >= PAGE_CACHE_SIZE || pos + write_bytes < inode->i_size ||
+ pos + write_bytes - start_pos > BTRFS_MAX_INLINE_DATA_SIZE(root)) {
+ u64 last_end;
+ for (i = 0; i < num_pages; i++) {
+ struct page *p = pages[i];
+ SetPageUptodate(p);
+ set_page_dirty(p);
}
- WARN_ON(this_write > write_bytes);
- write_bytes -= this_write;
+ last_end = pages[num_pages -1]->index << PAGE_CACHE_SHIFT;
+ last_end += PAGE_CACHE_SIZE - 1;
+ set_extent_delalloc(em_tree, start_pos, end_of_last_block,
+ GFP_NOFS);
+ } else {
+ struct page *p = pages[0];
+ /* step one, delete the existing extents in this range */
+ /* FIXME blocksize != pagesize */
+ if (start_pos < inode->i_size) {
+ err = btrfs_drop_extents(trans, root, inode, start_pos,
+ (pos + write_bytes + root->blocksize -1) &
+ ~((u64)root->blocksize - 1), &hint_block);
+ if (err)
+ goto failed;
+ }
+
+ err = insert_inline_extent(trans, root, inode, start_pos,
+ end_pos - start_pos, p, 0);
+ BUG_ON(err);
+ em->start = start_pos;
+ em->end = end_pos;
+ em->block_start = EXTENT_MAP_INLINE;
+ em->block_end = EXTENT_MAP_INLINE;
+ add_extent_mapping(em_tree, em);
+ }
+ if (end_pos > isize) {
+ i_size_write(inode, end_pos);
+ btrfs_update_inode(trans, root, inode);
}
failed:
+ err = btrfs_end_transaction(trans, root);
+out_unlock:
+ mutex_unlock(&root->fs_info->fs_mutex);
+ unlock_extent(em_tree, start_pos, end_of_last_block, GFP_NOFS);
+ free_extent_map(em);
return err;
}
+int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end)
+{
+ struct extent_map *em;
+ struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
+
+ while(1) {
+ em = lookup_extent_mapping(em_tree, start, end);
+ if (!em)
+ break;
+ remove_extent_mapping(em_tree, em);
+ /* once for us */
+ free_extent_map(em);
+ /* once for the tree*/
+ free_extent_map(em);
+ }
+ return 0;
+}
+
/*
* this is very complex, but the basic idea is to drop all extents
* in the range start - end. hint_block is filled in with a block number
int found_type;
int found_extent;
int found_inline;
+ int recow;
+
+ btrfs_drop_extent_cache(inode, start, end - 1);
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
while(1) {
+ recow = 0;
btrfs_release_path(root, path);
ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino,
search_start, -1);
}
path->slots[0]--;
}
+next_slot:
keep = 0;
bookend = 0;
found_extent = 0;
extent = NULL;
leaf = btrfs_buffer_leaf(path->nodes[0]);
slot = path->slots[0];
+ ret = 0;
btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key);
if (key.offset >= end || key.objectid != inode->i_ino) {
- ret = 0;
goto out;
}
- if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) {
- ret = 0;
+ if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY) {
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 (recow) {
+ search_start = key.offset;
+ continue;
}
-
- /* we found nothing we can drop */
- if (!found_extent && !found_inline) {
- ret = 0;
- goto out;
+ if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
+ 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);
+ }
+ } else {
+ extent_end = search_start;
}
- /* we found nothing inside the range */
- if (search_start >= extent_end) {
- ret = 0;
- goto out;
+ /* we found nothing we can drop */
+ if ((!found_extent && !found_inline) ||
+ search_start >= extent_end) {
+ int nextret;
+ u32 nritems;
+ nritems = btrfs_header_nritems(
+ btrfs_buffer_header(path->nodes[0]));
+ if (slot >= nritems - 1) {
+ nextret = btrfs_next_leaf(root, path);
+ if (nextret)
+ goto out;
+ recow = 1;
+ } else {
+ path->slots[0]++;
+ }
+ goto next_slot;
}
/* FIXME, there's only one inline extent allowed right now */
WARN_ON(found_inline);
bookend = 1;
}
-
/* truncate existing extent */
if (start > key.offset) {
u64 new_num;
}
btrfs_set_file_extent_num_blocks(extent,
new_num);
- mark_buffer_dirty(path->nodes[0]);
+ btrfs_mark_buffer_dirty(path->nodes[0]);
} else {
WARN_ON(1);
}
btrfs_file_extent_disk_blocknr(extent);
}
ret = btrfs_del_item(trans, root, path);
+ /* TODO update progress marker and return */
BUG_ON(ret);
btrfs_release_path(root, path);
extent = NULL;
ins.offset = end;
ins.flags = 0;
btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY);
-
btrfs_release_path(root, path);
ret = btrfs_insert_empty_item(trans, root, path, &ins,
sizeof(*extent));
+
+ if (ret) {
+ btrfs_print_leaf(root, btrfs_buffer_leaf(path->nodes[0]));
+ printk("got %d on inserting %Lu %u %Lu start %Lu end %Lu found %Lu %Lu\n", ret , ins.objectid, ins.flags, ins.offset, start, end, key.offset, extent_end);
+ }
BUG_ON(ret);
extent = btrfs_item_ptr(
btrfs_buffer_leaf(path->nodes[0]),
loff_t pos,
unsigned long first_index,
unsigned long last_index,
- size_t write_bytes,
- u64 alloc_extent_start)
+ size_t write_bytes)
{
int i;
unsigned long index = pos >> PAGE_CACHE_SHIFT;
struct inode *inode = file->f_path.dentry->d_inode;
- int offset;
int err = 0;
- int this_write;
- struct buffer_head *bh;
- struct buffer_head *head;
- loff_t isize = i_size_read(inode);
+ u64 num_blocks;
+ u64 start_pos;
+
+ start_pos = pos & ~((u64)root->blocksize - 1);
+ num_blocks = (write_bytes + pos - start_pos + root->blocksize - 1) >>
+ inode->i_blkbits;
memset(pages, 0, num_pages * sizeof(struct page *));
pages[i] = grab_cache_page(inode->i_mapping, index + i);
if (!pages[i]) {
err = -ENOMEM;
- goto failed_release;
+ BUG_ON(1);
}
cancel_dirty_page(pages[i], PAGE_CACHE_SIZE);
wait_on_page_writeback(pages[i]);
- offset = pos & (PAGE_CACHE_SIZE -1);
- this_write = min((size_t)PAGE_CACHE_SIZE - offset, write_bytes);
- if (!page_has_buffers(pages[i])) {
- create_empty_buffers(pages[i],
- root->fs_info->sb->s_blocksize,
- (1 << BH_Uptodate));
+ if (!PagePrivate(pages[i])) {
+ SetPagePrivate(pages[i]);
+ set_page_private(pages[i], 1);
+ WARN_ON(!pages[i]->mapping->a_ops->invalidatepage);
+ page_cache_get(pages[i]);
}
- head = page_buffers(pages[i]);
- bh = head;
- do {
- err = btrfs_map_bh_to_logical(root, bh,
- alloc_extent_start);
- BUG_ON(err);
- if (err)
- goto failed_truncate;
- bh = bh->b_this_page;
- if (alloc_extent_start)
- alloc_extent_start++;
- } while (bh != head);
- pos += this_write;
- WARN_ON(this_write > write_bytes);
- write_bytes -= this_write;
+ WARN_ON(!PageLocked(pages[i]));
}
return 0;
-
-failed_release:
- btrfs_drop_pages(pages, num_pages);
- return err;
-
-failed_truncate:
- btrfs_drop_pages(pages, num_pages);
- if (pos > isize)
- vmtruncate(inode, isize);
- return err;
}
static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
int ret = 0;
struct inode *inode = file->f_path.dentry->d_inode;
struct btrfs_root *root = BTRFS_I(inode)->root;
- struct page *pages[8];
+ struct page **pages = NULL;
+ int nrptrs;
struct page *pinned[2];
unsigned long first_index;
unsigned long last_index;
- u64 start_pos;
- u64 num_blocks;
- u64 alloc_extent_start;
- u64 hint_block;
- struct btrfs_trans_handle *trans;
- struct btrfs_key ins;
+
+ nrptrs = min((count + PAGE_CACHE_SIZE - 1) / PAGE_CACHE_SIZE,
+ PAGE_CACHE_SIZE / (sizeof(struct page *)));
pinned[0] = NULL;
pinned[1] = NULL;
if (file->f_flags & O_DIRECT)
goto out;
file_update_time(file);
- start_pos = pos & ~((u64)PAGE_CACHE_SIZE - 1);
- num_blocks = (count + pos - start_pos + root->blocksize - 1) >>
- inode->i_blkbits;
+ pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL);
mutex_lock(&inode->i_mutex);
first_index = pos >> PAGE_CACHE_SHIFT;
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);
+ ret = btrfs_readpage(NULL, pinned[0]);
BUG_ON(ret);
wait_on_page_locked(pinned[0]);
} else {
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);
+ ret = btrfs_readpage(NULL, pinned[1]);
BUG_ON(ret);
wait_on_page_locked(pinned[1]);
} else {
}
}
- mutex_lock(&root->fs_info->fs_mutex);
- trans = btrfs_start_transaction(root, 1);
- if (!trans) {
- err = -ENOMEM;
- mutex_unlock(&root->fs_info->fs_mutex);
- goto out_unlock;
- }
- btrfs_set_trans_block_group(trans, inode);
- /* FIXME blocksize != 4096 */
- inode->i_blocks += num_blocks << 3;
- hint_block = 0;
-
- /* FIXME...EIEIO, ENOSPC and more */
-
- /* step one, delete the existing extents in this range */
- if (start_pos < inode->i_size) {
- /* FIXME blocksize != pagesize */
- ret = btrfs_drop_extents(trans, root, inode,
- start_pos,
- (pos + count + root->blocksize -1) &
- ~((u64)root->blocksize - 1),
- &hint_block);
- BUG_ON(ret);
- }
-
- /* insert any holes we need to create */
- if (inode->i_size < start_pos) {
- u64 last_pos_in_file;
- u64 hole_size;
- u64 mask = root->blocksize - 1;
- last_pos_in_file = (inode->i_size + mask) & ~mask;
- hole_size = (start_pos - last_pos_in_file + mask) & ~mask;
- hole_size >>= inode->i_blkbits;
- if (last_pos_in_file < start_pos) {
- ret = btrfs_insert_file_extent(trans, root,
- inode->i_ino,
- last_pos_in_file,
- 0, 0, hole_size);
- }
- BUG_ON(ret);
- }
-
- /*
- * either allocate an extent for the new bytes or setup the key
- * to show we are doing inline data in the extent
- */
- 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, inode->i_ino,
- num_blocks, hint_block, (u64)-1,
- &ins, 1);
- BUG_ON(ret);
- ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
- start_pos, ins.objectid, ins.offset,
- 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);
- mutex_unlock(&root->fs_info->fs_mutex);
-
while(count > 0) {
size_t offset = pos & (PAGE_CACHE_SIZE - 1);
- size_t write_bytes = min(count,
- (size_t)PAGE_CACHE_SIZE - offset);
+ size_t write_bytes = min(count, nrptrs *
+ (size_t)PAGE_CACHE_SIZE -
+ offset);
size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >>
PAGE_CACHE_SHIFT;
+ WARN_ON(num_pages > nrptrs);
memset(pages, 0, sizeof(pages));
ret = prepare_pages(root, file, pages, num_pages,
pos, first_index, last_index,
- write_bytes, alloc_extent_start);
- BUG_ON(ret);
+ write_bytes);
+ if (ret)
+ goto out;
- /* FIXME blocks != pagesize */
- if (alloc_extent_start)
- alloc_extent_start += num_pages;
ret = btrfs_copy_from_user(pos, num_pages,
write_bytes, pages, buf);
- BUG_ON(ret);
+ if (ret) {
+ btrfs_drop_pages(pages, num_pages);
+ goto out;
+ }
ret = dirty_and_release_pages(NULL, root, file, pages,
num_pages, pos, write_bytes);
- BUG_ON(ret);
btrfs_drop_pages(pages, num_pages);
+ if (ret)
+ goto out;
buf += write_bytes;
count -= write_bytes;
pos += write_bytes;
num_written += write_bytes;
- balance_dirty_pages_ratelimited(inode->i_mapping);
+ balance_dirty_pages_ratelimited_nr(inode->i_mapping, num_pages);
btrfs_btree_balance_dirty(root);
cond_resched();
}
-out_unlock:
mutex_unlock(&inode->i_mutex);
out:
+ kfree(pages);
if (pinned[0])
page_cache_release(pinned[0]);
if (pinned[1])
page_cache_release(pinned[1]);
*ppos = pos;
current->backing_dev_info = NULL;
- mark_inode_dirty(inode);
return num_written ? num_written : err;
}
-/*
- * FIXME, do this by stuffing the csum we want in the info hanging off
- * page->private. For now, verify file csums on read
- */
-static int btrfs_read_actor(read_descriptor_t *desc, struct page *page,
- unsigned long offset, unsigned long size)
-{
- char *kaddr;
- unsigned long left, count = desc->count;
- struct inode *inode = page->mapping->host;
-
- if (size > count)
- size = count;
-
- 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;
- }
- }
-
- 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 ret %d\n",
- page->mapping->host->i_ino,
- 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.
- */
- if (!fault_in_pages_writeable(desc->arg.buf, size)) {
- kaddr = kmap_atomic(page, KM_USER0);
- left = __copy_to_user_inatomic(desc->arg.buf,
- kaddr + offset, size);
- kunmap_atomic(kaddr, KM_USER0);
- if (left == 0)
- goto success;
- }
-
- /* Do it the slow way */
- kaddr = kmap(page);
- left = __copy_to_user(desc->arg.buf, kaddr + offset, size);
- kunmap(page);
-
- if (left) {
- size -= left;
- desc->error = -EFAULT;
- }
-success:
- desc->count = count - size;
- desc->written += size;
- desc->arg.buf += size;
- return size;
-}
-
-/**
- * btrfs_file_aio_read - filesystem read routine, with a mod to csum verify
- * @iocb: kernel I/O control block
- * @iov: io vector request
- * @nr_segs: number of segments in the iovec
- * @pos: current file position
- */
-static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs, loff_t pos)
-{
- struct file *filp = iocb->ki_filp;
- ssize_t retval;
- unsigned long seg;
- size_t count;
- loff_t *ppos = &iocb->ki_pos;
-
- count = 0;
- for (seg = 0; seg < nr_segs; seg++) {
- const struct iovec *iv = &iov[seg];
-
- /*
- * If any segment has a negative length, or the cumulative
- * length ever wraps negative then return -EINVAL.
- */
- count += iv->iov_len;
- if (unlikely((ssize_t)(count|iv->iov_len) < 0))
- return -EINVAL;
- if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len))
- continue;
- if (seg == 0)
- return -EFAULT;
- nr_segs = seg;
- count -= iv->iov_len; /* This segment is no good */
- break;
- }
- retval = 0;
- if (count) {
- for (seg = 0; seg < nr_segs; seg++) {
- read_descriptor_t desc;
-
- desc.written = 0;
- desc.arg.buf = iov[seg].iov_base;
- desc.count = iov[seg].iov_len;
- if (desc.count == 0)
- continue;
- desc.error = 0;
- do_generic_file_read(filp, ppos, &desc,
- btrfs_read_actor);
- retval += desc.written;
- if (desc.error) {
- retval = retval ?: desc.error;
- break;
- }
- }
- }
- return retval;
-}
-
static int btrfs_sync_file(struct file *file,
struct dentry *dentry, int datasync)
{
struct inode *inode = dentry->d_inode;
struct btrfs_root *root = BTRFS_I(inode)->root;
- int ret;
+ int ret = 0;
struct btrfs_trans_handle *trans;
/*
- * FIXME, use inode generation number to check if we can skip the
- * commit
+ * check the transaction that last modified this inode
+ * and see if its already been committed
*/
mutex_lock(&root->fs_info->fs_mutex);
+ if (!BTRFS_I(inode)->last_trans)
+ goto out;
+ mutex_lock(&root->fs_info->trans_mutex);
+ if (BTRFS_I(inode)->last_trans <=
+ root->fs_info->last_trans_committed) {
+ BTRFS_I(inode)->last_trans = 0;
+ mutex_unlock(&root->fs_info->trans_mutex);
+ goto out;
+ }
+ mutex_unlock(&root->fs_info->trans_mutex);
+
+ /*
+ * ok we haven't committed the transaction yet, lets do a commit
+ */
trans = btrfs_start_transaction(root, 1);
if (!trans) {
ret = -ENOMEM;
goto out;
}
ret = btrfs_commit_transaction(trans, root);
- mutex_unlock(&root->fs_info->fs_mutex);
out:
+ mutex_unlock(&root->fs_info->fs_mutex);
return ret > 0 ? EIO : ret;
}
+static struct vm_operations_struct btrfs_file_vm_ops = {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
+ .nopage = filemap_nopage,
+ .populate = filemap_populate,
+#else
+ .fault = filemap_fault,
+#endif
+ .page_mkwrite = btrfs_page_mkwrite,
+};
+
+static int btrfs_file_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+ vma->vm_ops = &btrfs_file_vm_ops;
+ file_accessed(filp);
+ return 0;
+}
+
struct file_operations btrfs_file_operations = {
.llseek = generic_file_llseek,
.read = do_sync_read,
- .aio_read = btrfs_file_aio_read,
+ .aio_read = generic_file_aio_read,
.write = btrfs_file_write,
- .mmap = generic_file_mmap,
+ .mmap = btrfs_file_mmap,
.open = generic_file_open,
.ioctl = btrfs_ioctl,
.fsync = btrfs_sync_file,
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff