The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 0e852ab8974cd2b5946766b2d9baf82c78ace03d Mon Sep 17 00:00:00 2001 From: Chung-Chiang Cheng cccheng@synology.com Date: Fri, 15 Apr 2022 16:04:06 +0800 Subject: [PATCH] btrfs: do not allow compression on nodatacow files
Compression and nodatacow are mutually exclusive. A similar issue was fixed by commit f37c563bab429 ("btrfs: add missing check for nocow and compression inode flags"). Besides ioctl, there is another way to enable/disable/reset compression directly via xattr. The following steps will result in a invalid combination.
$ touch bar $ chattr +C bar $ lsattr bar ---------------C-- bar $ setfattr -n btrfs.compression -v zstd bar $ lsattr bar --------c------C-- bar
To align with the logic in check_fsflags, nocompress will also be unacceptable after this patch, to prevent mix any compression-related options with nodatacow.
$ touch bar $ chattr +C bar $ lsattr bar ---------------C-- bar $ setfattr -n btrfs.compression -v zstd bar setfattr: bar: Invalid argument $ setfattr -n btrfs.compression -v no bar setfattr: bar: Invalid argument
When both compression and nodatacow are enabled, then btrfs_run_delalloc_range prefers nodatacow and no compression happens.
Reported-by: Jayce Lin jaycelin@synology.com CC: stable@vger.kernel.org # 5.10.x: e6f9d6964802: btrfs: export a helper for compression hard check CC: stable@vger.kernel.org # 5.10.x Reviewed-by: Filipe Manana fdmanana@suse.com Signed-off-by: Chung-Chiang Cheng cccheng@synology.com Reviewed-by: David Sterba dsterba@suse.com Signed-off-by: David Sterba dsterba@suse.com
diff --git a/fs/btrfs/props.c b/fs/btrfs/props.c index 1a6d2d5b4b33..5a6f87744c28 100644 --- a/fs/btrfs/props.c +++ b/fs/btrfs/props.c @@ -17,7 +17,8 @@ static DEFINE_HASHTABLE(prop_handlers_ht, BTRFS_PROP_HANDLERS_HT_BITS); struct prop_handler { struct hlist_node node; const char *xattr_name; - int (*validate)(const char *value, size_t len); + int (*validate)(const struct btrfs_inode *inode, const char *value, + size_t len); int (*apply)(struct inode *inode, const char *value, size_t len); const char *(*extract)(struct inode *inode); int inheritable; @@ -55,7 +56,8 @@ find_prop_handler(const char *name, return NULL; }
-int btrfs_validate_prop(const char *name, const char *value, size_t value_len) +int btrfs_validate_prop(const struct btrfs_inode *inode, const char *name, + const char *value, size_t value_len) { const struct prop_handler *handler;
@@ -69,7 +71,7 @@ int btrfs_validate_prop(const char *name, const char *value, size_t value_len) if (value_len == 0) return 0;
- return handler->validate(value, value_len); + return handler->validate(inode, value, value_len); }
int btrfs_set_prop(struct btrfs_trans_handle *trans, struct inode *inode, @@ -252,8 +254,12 @@ int btrfs_load_inode_props(struct inode *inode, struct btrfs_path *path) return ret; }
-static int prop_compression_validate(const char *value, size_t len) +static int prop_compression_validate(const struct btrfs_inode *inode, + const char *value, size_t len) { + if (!btrfs_inode_can_compress(inode)) + return -EINVAL; + if (!value) return 0;
@@ -364,7 +370,7 @@ static int inherit_props(struct btrfs_trans_handle *trans, * This is not strictly necessary as the property should be * valid, but in case it isn't, don't propagate it further. */ - ret = h->validate(value, strlen(value)); + ret = h->validate(BTRFS_I(inode), value, strlen(value)); if (ret) continue;
diff --git a/fs/btrfs/props.h b/fs/btrfs/props.h index 40b2c65b518c..2b2ac15ab788 100644 --- a/fs/btrfs/props.h +++ b/fs/btrfs/props.h @@ -13,7 +13,8 @@ void __init btrfs_props_init(void); int btrfs_set_prop(struct btrfs_trans_handle *trans, struct inode *inode, const char *name, const char *value, size_t value_len, int flags); -int btrfs_validate_prop(const char *name, const char *value, size_t value_len); +int btrfs_validate_prop(const struct btrfs_inode *inode, const char *name, + const char *value, size_t value_len);
int btrfs_load_inode_props(struct inode *inode, struct btrfs_path *path);
diff --git a/fs/btrfs/xattr.c b/fs/btrfs/xattr.c index 99abf41b89b9..9632d0ff2038 100644 --- a/fs/btrfs/xattr.c +++ b/fs/btrfs/xattr.c @@ -403,7 +403,7 @@ static int btrfs_xattr_handler_set_prop(const struct xattr_handler *handler, struct btrfs_root *root = BTRFS_I(inode)->root;
name = xattr_full_name(handler, name); - ret = btrfs_validate_prop(name, value, size); + ret = btrfs_validate_prop(BTRFS_I(inode), name, value, size); if (ret) return ret;