path: root/fs
diff options
authorLinus Torvalds <torvalds@linux-foundation.org>2019-04-11 14:19:02 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-04-11 14:19:02 -0700
commit2d06b235815e6bd20395f3db9ada786a6f7a876e (patch)
tree38dd49f6dabc62a8daa8c59243f148c955a7bc56 /fs
parent582549e3fbe137eb6ce9be591aca25c2222a36b4 (diff)
parent272e5326c7837697882ce3162029ba893059b616 (diff)
Merge tag 'for-5.1-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linuxHEADmaster
Pull btrfs fixes from David Sterba: - fix parsing of compression algorithm when set as a inode property, this could end up with eg. 'zst' or 'zli' in the value - don't allow trim on a filesystem with unreplayed log, this could cause data loss if there are pending updates to the block groups that would not be subject to trim after replay * tag 'for-5.1-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: btrfs: prop: fix vanished compression property after failed set btrfs: prop: fix zstd compression parameter validation Btrfs: do not allow trimming when a fs is mounted with the nologreplay option
Diffstat (limited to 'fs')
2 files changed, 14 insertions, 4 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index ec2d8919e7fb..cd4e693406a0 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -501,6 +501,16 @@ static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
+ /*
+ * If the fs is mounted with nologreplay, which requires it to be
+ * mounted in RO mode as well, we can not allow discard on free space
+ * inside block groups, because log trees refer to extents that are not
+ * pinned in a block group's free space cache (pinning the extents is
+ * precisely the first phase of replaying a log tree).
+ */
+ if (btrfs_test_opt(fs_info, NOLOGREPLAY))
+ return -EROFS;
list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
dev_list) {
diff --git a/fs/btrfs/props.c b/fs/btrfs/props.c
index dc6140013ae8..61d22a56c0ba 100644
--- a/fs/btrfs/props.c
+++ b/fs/btrfs/props.c
@@ -366,11 +366,11 @@ int btrfs_subvol_inherit_props(struct btrfs_trans_handle *trans,
static int prop_compression_validate(const char *value, size_t len)
- if (!strncmp("lzo", value, len))
+ if (!strncmp("lzo", value, 3))
return 0;
- else if (!strncmp("zlib", value, len))
+ else if (!strncmp("zlib", value, 4))
return 0;
- else if (!strncmp("zstd", value, len))
+ else if (!strncmp("zstd", value, 4))
return 0;
return -EINVAL;
@@ -396,7 +396,7 @@ static int prop_compression_apply(struct inode *inode,
btrfs_set_fs_incompat(fs_info, COMPRESS_LZO);
} else if (!strncmp("zlib", value, 4)) {
- } else if (!strncmp("zstd", value, len)) {
+ } else if (!strncmp("zstd", value, 4)) {
btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD);
} else {