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Merge branch 'integration-4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/fdmanana/linux into for-linus-4.4

This commit is contained in:
Chris Mason 2015-10-21 18:23:59 -07:00
parent a0d58e48db 0305cd5f7f
commit a408365c62
4 changed files with 407 additions and 88 deletions
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8
fs/btrfs/extent_io.c
View File

@ -3070,8 +3070,12 @@ static int __do_readpage(struct extent_io_tree *tree,
set_extent_uptodate(tree, cur, cur + iosize - 1,
&cached, GFP_NOFS);
unlock_extent_cached(tree, cur, cur + iosize - 1,
&cached, GFP_NOFS);
if (parent_locked)
free_extent_state(cached);
else
unlock_extent_cached(tree, cur,
cur + iosize - 1,
&cached, GFP_NOFS);
cur = cur + iosize;
pg_offset += iosize;
continue;

82
fs/btrfs/inode.c
View File

@ -4216,6 +4216,47 @@ static int truncate_space_check(struct btrfs_trans_handle *trans,
}
static int truncate_inline_extent(struct inode *inode,
struct btrfs_path *path,
struct btrfs_key *found_key,
const u64 item_end,
const u64 new_size)
{
struct extent_buffer *leaf = path->nodes[0];
int slot = path->slots[0];
struct btrfs_file_extent_item *fi;
u32 size = (u32)(new_size - found_key->offset);
struct btrfs_root *root = BTRFS_I(inode)->root;
fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
if (btrfs_file_extent_compression(leaf, fi) != BTRFS_COMPRESS_NONE) {
loff_t offset = new_size;
loff_t page_end = ALIGN(offset, PAGE_CACHE_SIZE);
/*
* Zero out the remaining of the last page of our inline extent,
* instead of directly truncating our inline extent here - that
* would be much more complex (decompressing all the data, then
* compressing the truncated data, which might be bigger than
* the size of the inline extent, resize the extent, etc).
* We release the path because to get the page we might need to
* read the extent item from disk (data not in the page cache).
*/
btrfs_release_path(path);
return btrfs_truncate_page(inode, offset, page_end - offset, 0);
}
btrfs_set_file_extent_ram_bytes(leaf, fi, size);
size = btrfs_file_extent_calc_inline_size(size);
btrfs_truncate_item(root, path, size, 1);
if (test_bit(BTRFS_ROOT_REF_COWS, &root->state))
inode_sub_bytes(inode, item_end + 1 - new_size);
return 0;
}
/*
* this can truncate away extent items, csum items and directory items.
* It starts at a high offset and removes keys until it can't find
@ -4410,27 +4451,40 @@ search_again:
* special encodings
*/
if (!del_item &&
btrfs_file_extent_compression(leaf, fi) == 0 &&
btrfs_file_extent_encryption(leaf, fi) == 0 &&
btrfs_file_extent_other_encoding(leaf, fi) == 0) {
u32 size = new_size - found_key.offset;
if (test_bit(BTRFS_ROOT_REF_COWS, &root->state))
inode_sub_bytes(inode, item_end + 1 -
new_size);
/*
* update the ram bytes to properly reflect
* the new size of our item
* Need to release path in order to truncate a
* compressed extent. So delete any accumulated
* extent items so far.
*/
btrfs_set_file_extent_ram_bytes(leaf, fi, size);
size =
btrfs_file_extent_calc_inline_size(size);
btrfs_truncate_item(root, path, size, 1);
if (btrfs_file_extent_compression(leaf, fi) !=
BTRFS_COMPRESS_NONE && pending_del_nr) {
err = btrfs_del_items(trans, root, path,
pending_del_slot,
pending_del_nr);
if (err) {
btrfs_abort_transaction(trans,
root,
err);
goto error;
}
pending_del_nr = 0;
}
err = truncate_inline_extent(inode, path,
&found_key,
item_end,
new_size);
if (err) {
btrfs_abort_transaction(trans,
root, err);
goto error;
}
} else if (test_bit(BTRFS_ROOT_REF_COWS,
&root->state)) {
inode_sub_bytes(inode, item_end + 1 -
found_key.offset);
inode_sub_bytes(inode, item_end + 1 - new_size);
}
}
delete:

195
fs/btrfs/ioctl.c
View File

@ -3327,6 +3327,150 @@ static void clone_update_extent_map(struct inode *inode,
&BTRFS_I(inode)->runtime_flags);
}
/*
* Make sure we do not end up inserting an inline extent into a file that has
* already other (non-inline) extents. If a file has an inline extent it can
* not have any other extents and the (single) inline extent must start at the
* file offset 0. Failing to respect these rules will lead to file corruption,
* resulting in EIO errors on read/write operations, hitting BUG_ON's in mm, etc
*
* We can have extents that have been already written to disk or we can have
* dirty ranges still in delalloc, in which case the extent maps and items are
* created only when we run delalloc, and the delalloc ranges might fall outside
* the range we are currently locking in the inode's io tree. So we check the
* inode's i_size because of that (i_size updates are done while holding the
* i_mutex, which we are holding here).
* We also check to see if the inode has a size not greater than "datal" but has
* extents beyond it, due to an fallocate with FALLOC_FL_KEEP_SIZE (and we are
* protected against such concurrent fallocate calls by the i_mutex).
*
* If the file has no extents but a size greater than datal, do not allow the
* copy because we would need turn the inline extent into a non-inline one (even
* with NO_HOLES enabled). If we find our destination inode only has one inline
* extent, just overwrite it with the source inline extent if its size is less
* than the source extent's size, or we could copy the source inline extent's
* data into the destination inode's inline extent if the later is greater then
* the former.
*/
static int clone_copy_inline_extent(struct inode *src,
struct inode *dst,
struct btrfs_trans_handle *trans,
struct btrfs_path *path,
struct btrfs_key *new_key,
const u64 drop_start,
const u64 datal,
const u64 skip,
const u64 size,
char *inline_data)
{
struct btrfs_root *root = BTRFS_I(dst)->root;
const u64 aligned_end = ALIGN(new_key->offset + datal,
root->sectorsize);
int ret;
struct btrfs_key key;
if (new_key->offset > 0)
return -EOPNOTSUPP;
key.objectid = btrfs_ino(dst);
key.type = BTRFS_EXTENT_DATA_KEY;
key.offset = 0;
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0) {
return ret;
} else if (ret > 0) {
if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
ret = btrfs_next_leaf(root, path);
if (ret < 0)
return ret;
else if (ret > 0)
goto copy_inline_extent;
}
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
if (key.objectid == btrfs_ino(dst) &&
key.type == BTRFS_EXTENT_DATA_KEY) {
ASSERT(key.offset > 0);
return -EOPNOTSUPP;
}
} else if (i_size_read(dst) <= datal) {
struct btrfs_file_extent_item *ei;
u64 ext_len;
/*
* If the file size is <= datal, make sure there are no other
* extents following (can happen do to an fallocate call with
* the flag FALLOC_FL_KEEP_SIZE).
*/
ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_file_extent_item);
/*
* If it's an inline extent, it can not have other extents
* following it.
*/
if (btrfs_file_extent_type(path->nodes[0], ei) ==
BTRFS_FILE_EXTENT_INLINE)
goto copy_inline_extent;
ext_len = btrfs_file_extent_num_bytes(path->nodes[0], ei);
if (ext_len > aligned_end)
return -EOPNOTSUPP;
ret = btrfs_next_item(root, path);
if (ret < 0) {
return ret;
} else if (ret == 0) {
btrfs_item_key_to_cpu(path->nodes[0], &key,
path->slots[0]);
if (key.objectid == btrfs_ino(dst) &&
key.type == BTRFS_EXTENT_DATA_KEY)
return -EOPNOTSUPP;
}
}
copy_inline_extent:
/*
* We have no extent items, or we have an extent at offset 0 which may
* or may not be inlined. All these cases are dealt the same way.
*/
if (i_size_read(dst) > datal) {
/*
* If the destination inode has an inline extent...
* This would require copying the data from the source inline
* extent into the beginning of the destination's inline extent.
* But this is really complex, both extents can be compressed
* or just one of them, which would require decompressing and
* re-compressing data (which could increase the new compressed
* size, not allowing the compressed data to fit anymore in an
* inline extent).
* So just don't support this case for now (it should be rare,
* we are not really saving space when cloning inline extents).
*/
return -EOPNOTSUPP;
}
btrfs_release_path(path);
ret = btrfs_drop_extents(trans, root, dst, drop_start, aligned_end, 1);
if (ret)
return ret;
ret = btrfs_insert_empty_item(trans, root, path, new_key, size);
if (ret)
return ret;
if (skip) {
const u32 start = btrfs_file_extent_calc_inline_size(0);
memmove(inline_data + start, inline_data + start + skip, datal);
}
write_extent_buffer(path->nodes[0], inline_data,
btrfs_item_ptr_offset(path->nodes[0],
path->slots[0]),
size);
inode_add_bytes(dst, datal);
return 0;
}
/**
* btrfs_clone() - clone a range from inode file to another
*
@ -3593,21 +3737,6 @@ process_slot:
} else if (type == BTRFS_FILE_EXTENT_INLINE) {
u64 skip = 0;
u64 trim = 0;
u64 aligned_end = 0;
/*
* Don't copy an inline extent into an offset
* greater than zero. Having an inline extent
* at such an offset results in chaos as btrfs
* isn't prepared for such cases. Just skip
* this case for the same reasons as commented
* at btrfs_ioctl_clone().
*/
if (last_dest_end > 0) {
ret = -EOPNOTSUPP;
btrfs_end_transaction(trans, root);
goto out;
}
if (off > key.offset) {
skip = off - key.offset;
@ -3625,42 +3754,22 @@ process_slot:
size -= skip + trim;
datal -= skip + trim;
aligned_end = ALIGN(new_key.offset + datal,
root->sectorsize);
ret = btrfs_drop_extents(trans, root, inode,
drop_start,
aligned_end,
1);
ret = clone_copy_inline_extent(src, inode,
trans, path,
&new_key,
drop_start,
datal,
skip, size, buf);
if (ret) {
if (ret != -EOPNOTSUPP)
btrfs_abort_transaction(trans,
root, ret);
root,
ret);
btrfs_end_transaction(trans, root);
goto out;
}
ret = btrfs_insert_empty_item(trans, root, path,
&new_key, size);
if (ret) {
btrfs_abort_transaction(trans, root,
ret);
btrfs_end_transaction(trans, root);
goto out;
}
if (skip) {
u32 start =
btrfs_file_extent_calc_inline_size(0);
memmove(buf+start, buf+start+skip,
datal);
}
leaf = path->nodes[0];
slot = path->slots[0];
write_extent_buffer(leaf, buf,
btrfs_item_ptr_offset(leaf, slot),
size);
inode_add_bytes(inode, datal);
}
/* If we have an implicit hole (NO_HOLES feature). */

210
fs/btrfs/send.c
View File

@ -1434,16 +1434,6 @@ verbose_printk(KERN_DEBUG "btrfs: find_extent_clone: data_offset=%llu, "
}
if (cur_clone_root) {
if (compressed != BTRFS_COMPRESS_NONE) {
/*
* Offsets given by iterate_extent_inodes() are relative
* to the start of the extent, we need to add logical
* offset from the file extent item.
* (See why at backref.c:check_extent_in_eb())
*/
cur_clone_root->offset += btrfs_file_extent_offset(eb,
fi);
}
*found = cur_clone_root;
ret = 0;
} else {
@ -2353,8 +2343,14 @@ static int send_subvol_begin(struct send_ctx *sctx)
}
TLV_PUT_STRING(sctx, BTRFS_SEND_A_PATH, name, namelen);
TLV_PUT_UUID(sctx, BTRFS_SEND_A_UUID,
sctx->send_root->root_item.uuid);
if (!btrfs_is_empty_uuid(sctx->send_root->root_item.received_uuid))
TLV_PUT_UUID(sctx, BTRFS_SEND_A_UUID,
sctx->send_root->root_item.received_uuid);
else
TLV_PUT_UUID(sctx, BTRFS_SEND_A_UUID,
sctx->send_root->root_item.uuid);
TLV_PUT_U64(sctx, BTRFS_SEND_A_CTRANSID,
le64_to_cpu(sctx->send_root->root_item.ctransid));
if (parent_root) {
@ -4687,6 +4683,171 @@ tlv_put_failure:
return ret;
}
static int send_extent_data(struct send_ctx *sctx,
const u64 offset,
const u64 len)
{
u64 sent = 0;
if (sctx->flags & BTRFS_SEND_FLAG_NO_FILE_DATA)
return send_update_extent(sctx, offset, len);
while (sent < len) {
u64 size = len - sent;
int ret;
if (size > BTRFS_SEND_READ_SIZE)
size = BTRFS_SEND_READ_SIZE;
ret = send_write(sctx, offset + sent, size);
if (ret < 0)
return ret;
if (!ret)
break;
sent += ret;
}
return 0;
}
static int clone_range(struct send_ctx *sctx,
struct clone_root *clone_root,
const u64 disk_byte,
u64 data_offset,
u64 offset,
u64 len)
{
struct btrfs_path *path;
struct btrfs_key key;
int ret;
path = alloc_path_for_send();
if (!path)
return -ENOMEM;
/*
* We can't send a clone operation for the entire range if we find
* extent items in the respective range in the source file that
* refer to different extents or if we find holes.
* So check for that and do a mix of clone and regular write/copy
* operations if needed.
*
* Example:
*
* mkfs.btrfs -f /dev/sda
* mount /dev/sda /mnt
* xfs_io -f -c "pwrite -S 0xaa 0K 100K" /mnt/foo
* cp --reflink=always /mnt/foo /mnt/bar
* xfs_io -c "pwrite -S 0xbb 50K 50K" /mnt/foo
* btrfs subvolume snapshot -r /mnt /mnt/snap
*
* If when we send the snapshot and we are processing file bar (which
* has a higher inode number than foo) we blindly send a clone operation
* for the [0, 100K[ range from foo to bar, the receiver ends up getting
* a file bar that matches the content of file foo - iow, doesn't match
* the content from bar in the original filesystem.
*/
key.objectid = clone_root->ino;
key.type = BTRFS_EXTENT_DATA_KEY;
key.offset = clone_root->offset;
ret = btrfs_search_slot(NULL, clone_root->root, &key, path, 0, 0);
if (ret < 0)
goto out;
if (ret > 0 && path->slots[0] > 0) {
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0] - 1);
if (key.objectid == clone_root->ino &&
key.type == BTRFS_EXTENT_DATA_KEY)
path->slots[0]--;
}
while (true) {
struct extent_buffer *leaf = path->nodes[0];
int slot = path->slots[0];
struct btrfs_file_extent_item *ei;
u8 type;
u64 ext_len;
u64 clone_len;
if (slot >= btrfs_header_nritems(leaf)) {
ret = btrfs_next_leaf(clone_root->root, path);
if (ret < 0)
goto out;
else if (ret > 0)
break;
continue;
}
btrfs_item_key_to_cpu(leaf, &key, slot);
/*
* We might have an implicit trailing hole (NO_HOLES feature
* enabled). We deal with it after leaving this loop.
*/
if (key.objectid != clone_root->ino ||
key.type != BTRFS_EXTENT_DATA_KEY)
break;
ei = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
type = btrfs_file_extent_type(leaf, ei);
if (type == BTRFS_FILE_EXTENT_INLINE) {
ext_len = btrfs_file_extent_inline_len(leaf, slot, ei);
ext_len = PAGE_CACHE_ALIGN(ext_len);
} else {
ext_len = btrfs_file_extent_num_bytes(leaf, ei);
}
if (key.offset + ext_len <= clone_root->offset)
goto next;
if (key.offset > clone_root->offset) {
/* Implicit hole, NO_HOLES feature enabled. */
u64 hole_len = key.offset - clone_root->offset;
if (hole_len > len)
hole_len = len;
ret = send_extent_data(sctx, offset, hole_len);
if (ret < 0)
goto out;
len -= hole_len;
if (len == 0)
break;
offset += hole_len;
clone_root->offset += hole_len;
data_offset += hole_len;
}
if (key.offset >= clone_root->offset + len)
break;
clone_len = min_t(u64, ext_len, len);
if (btrfs_file_extent_disk_bytenr(leaf, ei) == disk_byte &&
btrfs_file_extent_offset(leaf, ei) == data_offset)
ret = send_clone(sctx, offset, clone_len, clone_root);
else
ret = send_extent_data(sctx, offset, clone_len);
if (ret < 0)
goto out;
len -= clone_len;
if (len == 0)
break;
offset += clone_len;
clone_root->offset += clone_len;
data_offset += clone_len;
next:
path->slots[0]++;
}
if (len > 0)
ret = send_extent_data(sctx, offset, len);
else
ret = 0;
out:
btrfs_free_path(path);
return ret;
}
static int send_write_or_clone(struct send_ctx *sctx,
struct btrfs_path *path,
struct btrfs_key *key,
@ -4695,9 +4856,7 @@ static int send_write_or_clone(struct send_ctx *sctx,
int ret = 0;
struct btrfs_file_extent_item *ei;
u64 offset = key->offset;
u64 pos = 0;
u64 len;
u32 l;
u8 type;
u64 bs = sctx->send_root->fs_info->sb->s_blocksize;
@ -4725,22 +4884,15 @@ static int send_write_or_clone(struct send_ctx *sctx,
}
if (clone_root && IS_ALIGNED(offset + len, bs)) {
ret = send_clone(sctx, offset, len, clone_root);
} else if (sctx->flags & BTRFS_SEND_FLAG_NO_FILE_DATA) {
ret = send_update_extent(sctx, offset, len);
u64 disk_byte;
u64 data_offset;
disk_byte = btrfs_file_extent_disk_bytenr(path->nodes[0], ei);
data_offset = btrfs_file_extent_offset(path->nodes[0], ei);
ret = clone_range(sctx, clone_root, disk_byte, data_offset,
offset, len);
} else {
while (pos < len) {
l = len - pos;
if (l > BTRFS_SEND_READ_SIZE)
l = BTRFS_SEND_READ_SIZE;
ret = send_write(sctx, pos + offset, l);
if (ret < 0)
goto out;
if (!ret)
break;
pos += ret;
}
ret = 0;
ret = send_extent_data(sctx, offset, len);
}
out:
return ret;