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authorLinus Torvalds <torvalds@linux-foundation.org>2014-04-11 14:16:53 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-11 14:16:53 -0700
commit3123bca71993c2346a458875488863772c1d5dc4 (patch)
treea1e082130a3d7a4ba1faaea60e699939cf821ab6 /fs/btrfs/inode.c
parent582076ab16779208e7eb6ce712a9c0a6cc5bafe4 (diff)
parente4fbaee29272533a242f117d18712e2974520d2c (diff)
downloadlinux-3123bca71993c2346a458875488863772c1d5dc4.tar.bz2
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
Pull second set of btrfs updates from Chris Mason: "The most important changes here are from Josef, fixing a btrfs regression in 3.14 that can cause corruptions in the extent allocation tree when snapshots are in use. Josef also fixed some deadlocks in send/recv and other assorted races when balance is running" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: (23 commits) Btrfs: fix compile warnings on on avr32 platform btrfs: allow mounting btrfs subvolumes with different ro/rw options btrfs: export global block reserve size as space_info btrfs: fix crash in remount(thread_pool=) case Btrfs: abort the transaction when we don't find our extent ref Btrfs: fix EINVAL checks in btrfs_clone Btrfs: fix unlock in __start_delalloc_inodes() Btrfs: scrub raid56 stripes in the right way Btrfs: don't compress for a small write Btrfs: more efficient io tree navigation on wait_extent_bit Btrfs: send, build path string only once in send_hole btrfs: filter invalid arg for btrfs resize Btrfs: send, fix data corruption due to incorrect hole detection Btrfs: kmalloc() doesn't return an ERR_PTR Btrfs: fix snapshot vs nocow writting btrfs: Change the expanding write sequence to fix snapshot related bug. btrfs: make device scan less noisy btrfs: fix lockdep warning with reclaim lock inversion Btrfs: hold the commit_root_sem when getting the commit root during send Btrfs: remove transaction from send ...
Diffstat (limited to 'fs/btrfs/inode.c')
-rw-r--r--fs/btrfs/inode.c36
1 files changed, 32 insertions, 4 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 06e9a4152b14..5f805bc944fa 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -394,6 +394,14 @@ static noinline int compress_file_range(struct inode *inode,
(start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size))
btrfs_add_inode_defrag(NULL, inode);
+ /*
+ * skip compression for a small file range(<=blocksize) that
+ * isn't an inline extent, since it dosen't save disk space at all.
+ */
+ if ((end - start + 1) <= blocksize &&
+ (start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size))
+ goto cleanup_and_bail_uncompressed;
+
actual_end = min_t(u64, isize, end + 1);
again:
will_compress = 0;
@@ -1271,6 +1279,15 @@ next_slot:
disk_bytenr += cur_offset - found_key.offset;
num_bytes = min(end + 1, extent_end) - cur_offset;
/*
+ * if there are pending snapshots for this root,
+ * we fall into common COW way.
+ */
+ if (!nolock) {
+ err = btrfs_start_nocow_write(root);
+ if (!err)
+ goto out_check;
+ }
+ /*
* force cow if csum exists in the range.
* this ensure that csum for a given extent are
* either valid or do not exist.
@@ -1289,6 +1306,8 @@ next_slot:
out_check:
if (extent_end <= start) {
path->slots[0]++;
+ if (!nolock && nocow)
+ btrfs_end_nocow_write(root);
goto next_slot;
}
if (!nocow) {
@@ -1306,8 +1325,11 @@ out_check:
ret = cow_file_range(inode, locked_page,
cow_start, found_key.offset - 1,
page_started, nr_written, 1);
- if (ret)
+ if (ret) {
+ if (!nolock && nocow)
+ btrfs_end_nocow_write(root);
goto error;
+ }
cow_start = (u64)-1;
}
@@ -1354,8 +1376,11 @@ out_check:
BTRFS_DATA_RELOC_TREE_OBJECTID) {
ret = btrfs_reloc_clone_csums(inode, cur_offset,
num_bytes);
- if (ret)
+ if (ret) {
+ if (!nolock && nocow)
+ btrfs_end_nocow_write(root);
goto error;
+ }
}
extent_clear_unlock_delalloc(inode, cur_offset,
@@ -1363,6 +1388,8 @@ out_check:
locked_page, EXTENT_LOCKED |
EXTENT_DELALLOC, PAGE_UNLOCK |
PAGE_SET_PRIVATE2);
+ if (!nolock && nocow)
+ btrfs_end_nocow_write(root);
cur_offset = extent_end;
if (cur_offset > end)
break;
@@ -8476,19 +8503,20 @@ static int __start_delalloc_inodes(struct btrfs_root *root, int delay_iput,
else
iput(inode);
ret = -ENOMEM;
- break;
+ goto out;
}
list_add_tail(&work->list, &works);
btrfs_queue_work(root->fs_info->flush_workers,
&work->work);
ret++;
if (nr != -1 && ret >= nr)
- break;
+ goto out;
cond_resched();
spin_lock(&root->delalloc_lock);
}
spin_unlock(&root->delalloc_lock);
+out:
list_for_each_entry_safe(work, next, &works, list) {
list_del_init(&work->list);
btrfs_wait_and_free_delalloc_work(work);