[that thing sat in -next for a while, but hadn't been posted yet;
mea culpa. Some followups for the next cycle are using it, and
it would be more convenient to get it before the next merge
window; if it gets any objections, I'll drop it from pull request
for #work.next, but it would be nice to have it in -rc1]
Quite a few places want to build a struct qstr by given string;
it would be convenient to have a primitive doing that, rather
than open-coding it via QSTR_INIT().
The closest approximation was in bcachefs, but that expands to
initializer list - {.len = strlen(string), .name = string}.
It would be more useful to have it as compound literal -
(struct qstr){.len = strlen(string), .name = string}.
Unlike initializer list it's a valid expression. What's more,
it's a valid lvalue - it's an equivalent of anonymous local
variable with such initializer, so the things like
path->dentry = d_alloc_pseudo(mnt->mnt_sb, &QSTR(name));
are valid. It can also be used as initializer, with identical
effect -
struct qstr x = (struct qstr){.name = s, .len = strlen(s)};
is equivalent to
struct qstr anon_variable = {.name = s, .len = strlen(s)};
struct qstr x = anon_variable;
// anon_variable is never used after that point
and any even remotely sane compiler will manage to collapse that
into
struct qstr x = {.name = s, .len = strlen(s)};
What compound literals can't be used for is initialization of
global variables, but those are covered by QSTR_INIT().
This commit lifts definition(s) of QSTR() into linux/dcache.h,
converts it to compound literal (all bcachefs users are fine
with that) and converts assorted open-coded instances to using
that.
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c
index 42bd1cb7c9cd..583ac81669c2 100644
--- a/fs/anon_inodes.c
+++ b/fs/anon_inodes.c
@@ -60,14 +60,14 @@ static struct inode *anon_inode_make_secure_inode(
const struct inode *context_inode)
{
struct inode *inode;
- const struct qstr qname = QSTR_INIT(name, strlen(name));
int error;
inode = alloc_anon_inode(anon_inode_mnt->mnt_sb);
if (IS_ERR(inode))
return inode;
inode->i_flags &= ~S_PRIVATE;
- error = security_inode_init_security_anon(inode, &qname, context_inode);
+ error = security_inode_init_security_anon(inode, &QSTR(name),
+ context_inode);
if (error) {
iput(inode);
return ERR_PTR(error);
diff --git a/fs/bcachefs/fsck.c b/fs/bcachefs/fsck.c
index 75c8a97a6954..7b3b63ed747c 100644
--- a/fs/bcachefs/fsck.c
+++ b/fs/bcachefs/fsck.c
@@ -405,7 +405,7 @@ static int reattach_inode(struct btree_trans *trans, struct bch_inode_unpacked *
return ret;
struct bch_hash_info dir_hash = bch2_hash_info_init(c, &lostfound);
- struct qstr name = (struct qstr) QSTR(name_buf);
+ struct qstr name = QSTR(name_buf);
inode->bi_dir = lostfound.bi_inum;
diff --git a/fs/bcachefs/recovery.c b/fs/bcachefs/recovery.c
index 3c7f941dde39..ebabba296882 100644
--- a/fs/bcachefs/recovery.c
+++ b/fs/bcachefs/recovery.c
@@ -32,8 +32,6 @@
#include <linux/sort.h>
#include <linux/stat.h>
-#define QSTR(n) { { { .len = strlen(n) } }, .name = n }
-
void bch2_btree_lost_data(struct bch_fs *c, enum btree_id btree)
{
if (btree >= BTREE_ID_NR_MAX)
diff --git a/fs/bcachefs/util.h b/fs/bcachefs/util.h
index fb02c1c36004..a27f4b84fe77 100644
--- a/fs/bcachefs/util.h
+++ b/fs/bcachefs/util.h
@@ -647,8 +647,6 @@ static inline int cmp_le32(__le32 l, __le32 r)
#include <linux/uuid.h>
-#define QSTR(n) { { { .len = strlen(n) } }, .name = n }
-
static inline bool qstr_eq(const struct qstr l, const struct qstr r)
{
return l.len == r.len && !memcmp(l.name, r.name, l.len);
diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
index a90d7d649739..60d2cf26e837 100644
--- a/fs/erofs/xattr.c
+++ b/fs/erofs/xattr.c
@@ -407,7 +407,7 @@ int erofs_getxattr(struct inode *inode, int index, const char *name,
}
it.index = index;
- it.name = (struct qstr)QSTR_INIT(name, strlen(name));
+ it.name = QSTR(name);
if (it.name.len > EROFS_NAME_LEN)
return -ERANGE;
diff --git a/fs/file_table.c b/fs/file_table.c
index 976736be47cb..a329623d0b42 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -351,9 +351,7 @@ static struct file *alloc_file(const struct path *path, int flags,
static inline int alloc_path_pseudo(const char *name, struct inode *inode,
struct vfsmount *mnt, struct path *path)
{
- struct qstr this = QSTR_INIT(name, strlen(name));
-
- path->dentry = d_alloc_pseudo(mnt->mnt_sb, &this);
+ path->dentry = d_alloc_pseudo(mnt->mnt_sb, &QSTR(name));
if (!path->dentry)
return -ENOMEM;
path->mnt = mntget(mnt);
diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c
index 8502ef68459b..0eb320617d7b 100644
--- a/fs/kernfs/file.c
+++ b/fs/kernfs/file.c
@@ -927,7 +927,7 @@ static void kernfs_notify_workfn(struct work_struct *work)
if (!inode)
continue;
- name = (struct qstr)QSTR_INIT(kn->name, strlen(kn->name));
+ name = QSTR(kn->name);
parent = kernfs_get_parent(kn);
if (parent) {
p_inode = ilookup(info->sb, kernfs_ino(parent));
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index bff956f7b2b9..3d53a6014591 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -57,6 +57,7 @@ struct qstr {
};
#define QSTR_INIT(n,l) { { { .len = l } }, .name = n }
+#define QSTR(n) (struct qstr)QSTR_INIT(n, strlen(n))
extern const struct qstr empty_name;
extern const struct qstr slash_name;
diff --git a/mm/secretmem.c b/mm/secretmem.c
index 399552814fd0..1b0a214ee558 100644
--- a/mm/secretmem.c
+++ b/mm/secretmem.c
@@ -195,14 +195,13 @@ static struct file *secretmem_file_create(unsigned long flags)
struct file *file;
struct inode *inode;
const char *anon_name = "[secretmem]";
- const struct qstr qname = QSTR_INIT(anon_name, strlen(anon_name));
int err;
inode = alloc_anon_inode(secretmem_mnt->mnt_sb);
if (IS_ERR(inode))
return ERR_CAST(inode);
- err = security_inode_init_security_anon(inode, &qname, NULL);
+ err = security_inode_init_security_anon(inode, &QSTR(anon_name), NULL);
if (err) {
file = ERR_PTR(err);
goto err_free_inode;
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index 7ce3721c06ca..eadc00410ebc 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -630,7 +630,7 @@ static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry)
static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent,
const char *name)
{
- struct qstr q = QSTR_INIT(name, strlen(name));
+ struct qstr q = QSTR(name);
struct dentry *dentry = d_hash_and_lookup(parent, &q);
if (!dentry) {
dentry = d_alloc(parent, &q);
@@ -1190,8 +1190,7 @@ static const struct rpc_filelist files[] = {
struct dentry *rpc_d_lookup_sb(const struct super_block *sb,
const unsigned char *dir_name)
{
- struct qstr dir = QSTR_INIT(dir_name, strlen(dir_name));
- return d_hash_and_lookup(sb->s_root, &dir);
+ return d_hash_and_lookup(sb->s_root, &QSTR(dir_name));
}
EXPORT_SYMBOL_GPL(rpc_d_lookup_sb);
@@ -1300,11 +1299,9 @@ rpc_gssd_dummy_populate(struct dentry *root, struct rpc_pipe *pipe_data)
struct dentry *gssd_dentry;
struct dentry *clnt_dentry = NULL;
struct dentry *pipe_dentry = NULL;
- struct qstr q = QSTR_INIT(files[RPCAUTH_gssd].name,
- strlen(files[RPCAUTH_gssd].name));
/* We should never get this far if "gssd" doesn't exist */
- gssd_dentry = d_hash_and_lookup(root, &q);
+ gssd_dentry = d_hash_and_lookup(root, &QSTR(files[RPCAUTH_gssd].name));
if (!gssd_dentry)
return ERR_PTR(-ENOENT);
@@ -1314,9 +1311,8 @@ rpc_gssd_dummy_populate(struct dentry *root, struct rpc_pipe *pipe_data)
goto out;
}
- q.name = gssd_dummy_clnt_dir[0].name;
- q.len = strlen(gssd_dummy_clnt_dir[0].name);
- clnt_dentry = d_hash_and_lookup(gssd_dentry, &q);
+ clnt_dentry = d_hash_and_lookup(gssd_dentry,
+ &QSTR(gssd_dummy_clnt_dir[0].name));
if (!clnt_dentry) {
__rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1);
pipe_dentry = ERR_PTR(-ENOENT);
