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Change calling conventions for filldir_t

Browse source 
filldir_t instances (directory iterators callbacks) used to return 0 for
"OK, keep going" or -E... for "stop".  Note that it's *NOT* how the
error values are reported - the rules for those are callback-dependent
and ->iterate{,_shared}() instances only care about zero vs. non-zero
(look at emit_dir() and friends).

So let's just return bool ("should we keep going?") - it's less confusing
that way.  The choice between "true means keep going" and "true means
stop" is bikesheddable; we have two groups of callbacks -
	do something for everything in directory, until we run into problem
and
	find an entry in directory and do something to it.

The former tended to use 0/-E... conventions - -E<something> on failure.
The latter tended to use 0/1, 1 being "stop, we are done".
The callers treated anything non-zero as "stop", ignoring which
non-zero value did they get.

"true means stop" would be more natural for the second group; "true
means keep going" - for the first one.  I tried both variants and
the things like
	if allocation failed
		something = -ENOMEM;
		return true;
just looked unnatural and asking for trouble.

[folded suggestion from Matthew Wilcox <willy@infradead.org>]
Acked-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2022-08-16 11:57:56 -04:00
parent d6da19c9ca
commit 25885a35a7
19 changed files with 153 additions and 155 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
Documentation/filesystems/porting.rst
View file

@ -922,3 +922,14 @@ is provided - file_open_root_mnt(). In-tree users adjusted.
no_llseek is gone; don't set .llseek to that - just leave it NULL instead.
Checks for "does that file have llseek(2), or should it fail with ESPIPE"
should be done by looking at FMODE_LSEEK in file->f_mode.
---
*mandatory*
filldir_t (readdir callbacks) calling conventions have changed. Instead of
returning 0 or -E... it returns bool now. false means "no more" (as -E... used
to) and true - "keep going" (as 0 in old calling conventions). Rationale:
callers never looked at specific -E... values anyway. ->iterate() and
->iterate_shared() instance require no changes at all, all filldir_t ones in
the tree converted.

10
arch/alpha/kernel/osf_sys.c
View file

@ -108,7 +108,7 @@ struct osf_dirent_callback {
int error;
};
static int
static bool
osf_filldir(struct dir_context *ctx, const char *name, int namlen,
loff_t offset, u64 ino, unsigned int d_type)
{
@ -120,11 +120,11 @@ osf_filldir(struct dir_context *ctx, const char *name, int namlen,
buf->error = -EINVAL; /* only used if we fail */
if (reclen > buf->count)
return -EINVAL;
return false;
d_ino = ino;
if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
buf->error = -EOVERFLOW;
return -EOVERFLOW;
return false;
}
if (buf->basep) {
if (put_user(offset, buf->basep))
@ -141,10 +141,10 @@ osf_filldir(struct dir_context *ctx, const char *name, int namlen,
dirent = (void __user *)dirent + reclen;
buf->dirent = dirent;
buf->count -= reclen;
return 0;
return true;
Efault:
buf->error = -EFAULT;
return -EFAULT;
return false;
}
SYSCALL_DEFINE4(osf_getdirentries, unsigned int, fd,

23
fs/afs/dir.c
View file

@ -24,9 +24,9 @@ static int afs_readdir(struct file *file, struct dir_context *ctx);
static int afs_d_revalidate(struct dentry *dentry, unsigned int flags);
static int afs_d_delete(const struct dentry *dentry);
static void afs_d_iput(struct dentry *dentry, struct inode *inode);
static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen,
static bool afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen,
loff_t fpos, u64 ino, unsigned dtype);
static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen,
static bool afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen,
loff_t fpos, u64 ino, unsigned dtype);
static int afs_create(struct user_namespace *mnt_userns, struct inode *dir,
struct dentry *dentry, umode_t mode, bool excl);
@ -568,7 +568,7 @@ static int afs_readdir(struct file *file, struct dir_context *ctx)
* - if afs_dir_iterate_block() spots this function, it'll pass the FID
* uniquifier through dtype
*/
static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name,
static bool afs_lookup_one_filldir(struct dir_context *ctx, const char *name,
int nlen, loff_t fpos, u64 ino, unsigned dtype)
{
struct afs_lookup_one_cookie *cookie =
@ -584,16 +584,16 @@ static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name,
if (cookie->name.len != nlen ||
memcmp(cookie->name.name, name, nlen) != 0) {
_leave(" = 0 [no]");
return 0;
_leave(" = true [keep looking]");
return true;
}
cookie->fid.vnode = ino;
cookie->fid.unique = dtype;
cookie->found = 1;
_leave(" = -1 [found]");
return -1;
_leave(" = false [found]");
return false;
}
/*
@ -636,12 +636,11 @@ static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry,
* - if afs_dir_iterate_block() spots this function, it'll pass the FID
* uniquifier through dtype
*/
static int afs_lookup_filldir(struct dir_context *ctx, const char *name,
static bool afs_lookup_filldir(struct dir_context *ctx, const char *name,
int nlen, loff_t fpos, u64 ino, unsigned dtype)
{
struct afs_lookup_cookie *cookie =
container_of(ctx, struct afs_lookup_cookie, ctx);
int ret;
_enter("{%s,%u},%s,%u,,%llu,%u",
cookie->name.name, cookie->name.len, name, nlen,
@ -663,12 +662,10 @@ static int afs_lookup_filldir(struct dir_context *ctx, const char *name,
cookie->fids[1].unique = dtype;
cookie->found = 1;
if (cookie->one_only)
return -1;
return false;
}
ret = cookie->nr_fids >= 50 ? -1 : 0;
_leave(" = %d", ret);
return ret;
return cookie->nr_fids < 50;
}
/*

38
fs/ecryptfs/file.c
View file

@ -53,7 +53,7 @@ struct ecryptfs_getdents_callback {
};
/* Inspired by generic filldir in fs/readdir.c */
static int
static bool
ecryptfs_filldir(struct dir_context *ctx, const char *lower_name,
int lower_namelen, loff_t offset, u64 ino, unsigned int d_type)
{
@ -61,18 +61,19 @@ ecryptfs_filldir(struct dir_context *ctx, const char *lower_name,
container_of(ctx, struct ecryptfs_getdents_callback, ctx);
size_t name_size;
char *name;
int rc;
int err;
bool res;
buf->filldir_called++;
rc = ecryptfs_decode_and_decrypt_filename(&name, &name_size,
buf->sb, lower_name,
lower_namelen);
if (rc) {
if (rc != -EINVAL) {
err = ecryptfs_decode_and_decrypt_filename(&name, &name_size,
buf->sb, lower_name,
lower_namelen);
if (err) {
if (err != -EINVAL) {
ecryptfs_printk(KERN_DEBUG,
"%s: Error attempting to decode and decrypt filename [%s]; rc = [%d]\n",
__func__, lower_name, rc);
return rc;
__func__, lower_name, err);
return false;
}
/* Mask -EINVAL errors as these are most likely due a plaintext
@ -81,16 +82,15 @@ ecryptfs_filldir(struct dir_context *ctx, const char *lower_name,
* the "lost+found" dentry in the root directory of an Ext4
* filesystem.
*/
return 0;
return true;
}
buf->caller->pos = buf->ctx.pos;
rc = !dir_emit(buf->caller, name, name_size, ino, d_type);
res = dir_emit(buf->caller, name, name_size, ino, d_type);
kfree(name);
if (!rc)
if (res)
buf->entries_written++;
return rc;
return res;
}
/**
@ -111,14 +111,8 @@ static int ecryptfs_readdir(struct file *file, struct dir_context *ctx)
lower_file = ecryptfs_file_to_lower(file);
rc = iterate_dir(lower_file, &buf.ctx);
ctx->pos = buf.ctx.pos;
if (rc < 0)
goto out;
if (buf.filldir_called && !buf.entries_written)
goto out;
if (rc >= 0)
fsstack_copy_attr_atime(inode,
file_inode(lower_file));
out:
if (rc >= 0 && (buf.entries_written || !buf.filldir_called))
fsstack_copy_attr_atime(inode, file_inode(lower_file));
return rc;
}

7
fs/exportfs/expfs.c
View file

@ -248,21 +248,20 @@ struct getdents_callback {
* A rather strange filldir function to capture
* the name matching the specified inode number.
*/
static int filldir_one(struct dir_context *ctx, const char *name, int len,
static bool filldir_one(struct dir_context *ctx, const char *name, int len,
loff_t pos, u64 ino, unsigned int d_type)
{
struct getdents_callback *buf =
container_of(ctx, struct getdents_callback, ctx);
int result = 0;
buf->sequence++;
if (buf->ino == ino && len <= NAME_MAX) {
memcpy(buf->name, name, len);
buf->name[len] = '\0';
buf->found = 1;
result = -1;
return false; // no more
}
return result;
return true;
}
/**

8
fs/fat/dir.c
View file

@ -705,7 +705,7 @@ static int fat_readdir(struct file *file, struct dir_context *ctx)
}
#define FAT_IOCTL_FILLDIR_FUNC(func, dirent_type) \
static int func(struct dir_context *ctx, const char *name, int name_len, \
static bool func(struct dir_context *ctx, const char *name, int name_len, \
loff_t offset, u64 ino, unsigned int d_type) \
{ \
struct fat_ioctl_filldir_callback *buf = \
@ -714,7 +714,7 @@ static int func(struct dir_context *ctx, const char *name, int name_len, \
struct dirent_type __user *d2 = d1 + 1; \
\
if (buf->result) \
return -EINVAL; \
return false; \
buf->result++; \
\
if (name != NULL) { \
@ -750,10 +750,10 @@ static int func(struct dir_context *ctx, const char *name, int name_len, \
put_user(short_len, &d1->d_reclen)) \
goto efault; \
} \
return 0; \
return true; \
efault: \
buf->result = -EFAULT; \
return -EFAULT; \
return false; \
}
FAT_IOCTL_FILLDIR_FUNC(fat_ioctl_filldir, __fat_dirent)

6
fs/gfs2/export.c
View file

@ -66,7 +66,7 @@ struct get_name_filldir {
char *name;
};
static int get_name_filldir(struct dir_context *ctx, const char *name,
static bool get_name_filldir(struct dir_context *ctx, const char *name,
int length, loff_t offset, u64 inum,
unsigned int type)
{
@ -74,12 +74,12 @@ static int get_name_filldir(struct dir_context *ctx, const char *name,
container_of(ctx, struct get_name_filldir, ctx);
if (inum != gnfd->inum.no_addr)
return 0;
return true;
memcpy(gnfd->name, name, length);
gnfd->name[length] = 0;
return 1;
return false;
}
static int gfs2_get_name(struct dentry *parent, char *name,

16
fs/ksmbd/smb2pdu.c
View file

@ -3779,7 +3779,7 @@ static int reserve_populate_dentry(struct ksmbd_dir_info *d_info,
return 0;
}
static int __query_dir(struct dir_context *ctx, const char *name, int namlen,
static bool __query_dir(struct dir_context *ctx, const char *name, int namlen,
loff_t offset, u64 ino, unsigned int d_type)
{
struct ksmbd_readdir_data *buf;
@ -3793,22 +3793,20 @@ static int __query_dir(struct dir_context *ctx, const char *name, int namlen,
/* dot and dotdot entries are already reserved */
if (!strcmp(".", name) || !strcmp("..", name))
return 0;
return true;
if (ksmbd_share_veto_filename(priv->work->tcon->share_conf, name))
return 0;
return true;
if (!match_pattern(name, namlen, priv->search_pattern))
return 0;
return true;
d_info->name = name;
d_info->name_len = namlen;
rc = reserve_populate_dentry(d_info, priv->info_level);
if (rc)
return rc;
if (d_info->flags & SMB2_RETURN_SINGLE_ENTRY) {
return false;
if (d_info->flags & SMB2_RETURN_SINGLE_ENTRY)
d_info->out_buf_len = 0;
return 0;
}
return 0;
return true;
}
static void restart_ctx(struct dir_context *ctx)

14
fs/ksmbd/vfs.c
View file

@ -1105,7 +1105,7 @@ int ksmbd_vfs_unlink(struct user_namespace *user_ns,
return err;
}
static int __dir_empty(struct dir_context *ctx, const char *name, int namlen,
static bool __dir_empty(struct dir_context *ctx, const char *name, int namlen,
loff_t offset, u64 ino, unsigned int d_type)
{
struct ksmbd_readdir_data *buf;
@ -1113,9 +1113,7 @@ static int __dir_empty(struct dir_context *ctx, const char *name, int namlen,
buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
buf->dirent_count++;
if (buf->dirent_count > 2)
return -ENOTEMPTY;
return 0;
return buf->dirent_count <= 2;
}
/**
@ -1142,7 +1140,7 @@ int ksmbd_vfs_empty_dir(struct ksmbd_file *fp)
return err;
}
static int __caseless_lookup(struct dir_context *ctx, const char *name,
static bool __caseless_lookup(struct dir_context *ctx, const char *name,
int namlen, loff_t offset, u64 ino,
unsigned int d_type)
{
@ -1151,13 +1149,13 @@ static int __caseless_lookup(struct dir_context *ctx, const char *name,
buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
if (buf->used != namlen)
return 0;
return true;
if (!strncasecmp((char *)buf->private, name, namlen)) {
memcpy((char *)buf->private, name, namlen);
buf->dirent_count = 1;
return -EEXIST;
return false;
}
return 0;
return true;
}
/**

8
fs/nfsd/nfs4recover.c
View file

@ -266,7 +266,7 @@ struct nfs4_dir_ctx {
struct list_head names;
};
static int
static bool
nfsd4_build_namelist(struct dir_context *__ctx, const char *name, int namlen,
loff_t offset, u64 ino, unsigned int d_type)
{
@ -275,14 +275,14 @@ nfsd4_build_namelist(struct dir_context *__ctx, const char *name, int namlen,
struct name_list *entry;
if (namlen != HEXDIR_LEN - 1)
return 0;
return true;
entry = kmalloc(sizeof(struct name_list), GFP_KERNEL);
if (entry == NULL)
return -ENOMEM;
return false;
memcpy(entry->name, name, HEXDIR_LEN - 1);
entry->name[HEXDIR_LEN - 1] = '\0';
list_add(&entry->list, &ctx->names);
return 0;
return true;
}
static int

6
fs/nfsd/vfs.c
View file

@ -1811,7 +1811,7 @@ struct readdir_data {
int full;
};
static int nfsd_buffered_filldir(struct dir_context *ctx, const char *name,
static bool nfsd_buffered_filldir(struct dir_context *ctx, const char *name,
int namlen, loff_t offset, u64 ino,
unsigned int d_type)
{
@ -1823,7 +1823,7 @@ static int nfsd_buffered_filldir(struct dir_context *ctx, const char *name,
reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64));
if (buf->used + reclen > PAGE_SIZE) {
buf->full = 1;
return -EINVAL;
return false;
}
de->namlen = namlen;
@ -1833,7 +1833,7 @@ static int nfsd_buffered_filldir(struct dir_context *ctx, const char *name,
memcpy(de->name, name, namlen);
buf->used += reclen;
return 0;
return true;
}
static __be32 nfsd_buffered_readdir(struct file *file, struct svc_fh *fhp,

10
fs/ocfs2/dir.c
View file

@ -2032,7 +2032,7 @@ struct ocfs2_empty_dir_priv {
unsigned seen_other;
unsigned dx_dir;
};
static int ocfs2_empty_dir_filldir(struct dir_context *ctx, const char *name,
static bool ocfs2_empty_dir_filldir(struct dir_context *ctx, const char *name,
int name_len, loff_t pos, u64 ino,
unsigned type)
{
@ -2052,7 +2052,7 @@ static int ocfs2_empty_dir_filldir(struct dir_context *ctx, const char *name,
*/
if (name_len == 1 && !strncmp(".", name, 1) && pos == 0) {
p->seen_dot = 1;
return 0;
return true;
}
if (name_len == 2 && !strncmp("..", name, 2) &&
@ -2060,13 +2060,13 @@ static int ocfs2_empty_dir_filldir(struct dir_context *ctx, const char *name,
p->seen_dot_dot = 1;
if (p->dx_dir && p->seen_dot)
return 1;
return false;
return 0;
return true;
}
p->seen_other = 1;
return 1;
return false;
}
static int ocfs2_empty_dir_dx(struct inode *inode,

14
fs/ocfs2/journal.c
View file

@ -2057,7 +2057,7 @@ struct ocfs2_orphan_filldir_priv {
enum ocfs2_orphan_reco_type orphan_reco_type;
};
static int ocfs2_orphan_filldir(struct dir_context *ctx, const char *name,
static bool ocfs2_orphan_filldir(struct dir_context *ctx, const char *name,
int name_len, loff_t pos, u64 ino,
unsigned type)
{
@ -2066,21 +2066,21 @@ static int ocfs2_orphan_filldir(struct dir_context *ctx, const char *name,
struct inode *iter;
if (name_len == 1 && !strncmp(".", name, 1))
return 0;
return true;
if (name_len == 2 && !strncmp("..", name, 2))
return 0;
return true;
/* do not include dio entry in case of orphan scan */
if ((p->orphan_reco_type == ORPHAN_NO_NEED_TRUNCATE) &&
(!strncmp(name, OCFS2_DIO_ORPHAN_PREFIX,
OCFS2_DIO_ORPHAN_PREFIX_LEN)))
return 0;
return true;
/* Skip bad inodes so that recovery can continue */
iter = ocfs2_iget(p->osb, ino,
OCFS2_FI_FLAG_ORPHAN_RECOVERY, 0);
if (IS_ERR(iter))
return 0;
return true;
if (!strncmp(name, OCFS2_DIO_ORPHAN_PREFIX,
OCFS2_DIO_ORPHAN_PREFIX_LEN))
@ -2090,7 +2090,7 @@ static int ocfs2_orphan_filldir(struct dir_context *ctx, const char *name,
* happen concurrently with unlink/rename */
if (OCFS2_I(iter)->ip_next_orphan) {
iput(iter);
return 0;
return true;
}
trace_ocfs2_orphan_filldir((unsigned long long)OCFS2_I(iter)->ip_blkno);
@ -2099,7 +2099,7 @@ static int ocfs2_orphan_filldir(struct dir_context *ctx, const char *name,
OCFS2_I(iter)->ip_next_orphan = p->head;
p->head = iter;
return 0;
return true;
}
static int ocfs2_queue_orphans(struct ocfs2_super *osb,

28
fs/overlayfs/readdir.c
View file

@ -170,7 +170,7 @@ static struct ovl_cache_entry *ovl_cache_entry_new(struct ovl_readdir_data *rdd,
return p;
}
static int ovl_cache_entry_add_rb(struct ovl_readdir_data *rdd,
static bool ovl_cache_entry_add_rb(struct ovl_readdir_data *rdd,
const char *name, int len, u64 ino,
unsigned int d_type)
{
@ -179,22 +179,22 @@ static int ovl_cache_entry_add_rb(struct ovl_readdir_data *rdd,
struct ovl_cache_entry *p;
if (ovl_cache_entry_find_link(name, len, &newp, &parent))
return 0;
return true;
p = ovl_cache_entry_new(rdd, name, len, ino, d_type);
if (p == NULL) {
rdd->err = -ENOMEM;
return -ENOMEM;
return false;
}
list_add_tail(&p->l_node, rdd->list);
rb_link_node(&p->node, parent, newp);
rb_insert_color(&p->node, rdd->root);
return 0;
return true;
}
static int ovl_fill_lowest(struct ovl_readdir_data *rdd,
static bool ovl_fill_lowest(struct ovl_readdir_data *rdd,
const char *name, int namelen,
loff_t offset, u64 ino, unsigned int d_type)
{
@ -211,7 +211,7 @@ static int ovl_fill_lowest(struct ovl_readdir_data *rdd,
list_add_tail(&p->l_node, &rdd->middle);
}
return rdd->err;
return rdd->err == 0;
}
void ovl_cache_free(struct list_head *list)
@ -250,7 +250,7 @@ static void ovl_cache_put(struct ovl_dir_file *od, struct dentry *dentry)
}
}
static int ovl_fill_merge(struct dir_context *ctx, const char *name,
static bool ovl_fill_merge(struct dir_context *ctx, const char *name,
int namelen, loff_t offset, u64 ino,
unsigned int d_type)
{
@ -528,7 +528,7 @@ static int ovl_cache_update_ino(struct path *path, struct ovl_cache_entry *p)
goto out;
}
static int ovl_fill_plain(struct dir_context *ctx, const char *name,
static bool ovl_fill_plain(struct dir_context *ctx, const char *name,
int namelen, loff_t offset, u64 ino,
unsigned int d_type)
{
@ -540,11 +540,11 @@ static int ovl_fill_plain(struct dir_context *ctx, const char *name,
p = ovl_cache_entry_new(rdd, name, namelen, ino, d_type);
if (p == NULL) {
rdd->err = -ENOMEM;
return -ENOMEM;
return false;
}
list_add_tail(&p->l_node, rdd->list);
return 0;
return true;
}
static int ovl_dir_read_impure(struct path *path, struct list_head *list,
@ -648,7 +648,7 @@ struct ovl_readdir_translate {
bool xinowarn;
};
static int ovl_fill_real(struct dir_context *ctx, const char *name,
static bool ovl_fill_real(struct dir_context *ctx, const char *name,
int namelen, loff_t offset, u64 ino,
unsigned int d_type)
{
@ -1027,7 +1027,7 @@ void ovl_cleanup_whiteouts(struct ovl_fs *ofs, struct dentry *upper,
inode_unlock(upper->d_inode);
}
static int ovl_check_d_type(struct dir_context *ctx, const char *name,
static bool ovl_check_d_type(struct dir_context *ctx, const char *name,
int namelen, loff_t offset, u64 ino,
unsigned int d_type)
{
@ -1036,12 +1036,12 @@ static int ovl_check_d_type(struct dir_context *ctx, const char *name,
/* Even if d_type is not supported, DT_DIR is returned for . and .. */
if (!strncmp(name, ".", namelen) || !strncmp(name, "..", namelen))
return 0;
return true;
if (d_type != DT_UNKNOWN)
rdd->d_type_supported = true;
return 0;
return true;
}
/*

68
fs/readdir.c
View file

@ -140,7 +140,7 @@ struct readdir_callback {
int result;
};
static int fillonedir(struct dir_context *ctx, const char *name, int namlen,
static bool fillonedir(struct dir_context *ctx, const char *name, int namlen,
loff_t offset, u64 ino, unsigned int d_type)
{
struct readdir_callback *buf =
@ -149,14 +149,14 @@ static int fillonedir(struct dir_context *ctx, const char *name, int namlen,
unsigned long d_ino;
if (buf->result)
return -EINVAL;
return false;
buf->result = verify_dirent_name(name, namlen);
if (buf->result < 0)
return buf->result;
if (buf->result)
return false;
d_ino = ino;
if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
buf->result = -EOVERFLOW;
return -EOVERFLOW;
return false;
}
buf->result++;
dirent = buf->dirent;
@ -169,12 +169,12 @@ static int fillonedir(struct dir_context *ctx, const char *name, int namlen,
unsafe_put_user(namlen, &dirent->d_namlen, efault_end);
unsafe_copy_dirent_name(dirent->d_name, name, namlen, efault_end);
user_write_access_end();
return 0;
return true;
efault_end:
user_write_access_end();
efault:
buf->result = -EFAULT;
return -EFAULT;
return false;
}
SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
@ -219,7 +219,7 @@ struct getdents_callback {
int error;
};
static int filldir(struct dir_context *ctx, const char *name, int namlen,
static bool filldir(struct dir_context *ctx, const char *name, int namlen,
loff_t offset, u64 ino, unsigned int d_type)
{
struct linux_dirent __user *dirent, *prev;
@ -232,18 +232,18 @@ static int filldir(struct dir_context *ctx, const char *name, int namlen,
buf->error = verify_dirent_name(name, namlen);
if (unlikely(buf->error))
return buf->error;
return false;
buf->error = -EINVAL; /* only used if we fail.. */
if (reclen > buf->count)
return -EINVAL;
return false;
d_ino = ino;
if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
buf->error = -EOVERFLOW;
return -EOVERFLOW;
return false;
}
prev_reclen = buf->prev_reclen;
if (prev_reclen && signal_pending(current))
return -EINTR;
return false;
dirent = buf->current_dir;
prev = (void __user *) dirent - prev_reclen;
if (!user_write_access_begin(prev, reclen + prev_reclen))
@ -260,12 +260,12 @@ static int filldir(struct dir_context *ctx, const char *name, int namlen,
buf->current_dir = (void __user *)dirent + reclen;
buf->prev_reclen = reclen;
buf->count -= reclen;
return 0;
return true;
efault_end:
user_write_access_end();
efault:
buf->error = -EFAULT;
return -EFAULT;
return false;
}
SYSCALL_DEFINE3(getdents, unsigned int, fd,
@ -307,7 +307,7 @@ struct getdents_callback64 {
int error;
};
static int filldir64(struct dir_context *ctx, const char *name, int namlen,
static bool filldir64(struct dir_context *ctx, const char *name, int namlen,
loff_t offset, u64 ino, unsigned int d_type)
{
struct linux_dirent64 __user *dirent, *prev;
@ -319,13 +319,13 @@ static int filldir64(struct dir_context *ctx, const char *name, int namlen,
buf->error = verify_dirent_name(name, namlen);
if (unlikely(buf->error))
return buf->error;
return false;
buf->error = -EINVAL; /* only used if we fail.. */
if (reclen > buf->count)
return -EINVAL;
return false;
prev_reclen = buf->prev_reclen;
if (prev_reclen && signal_pending(current))
return -EINTR;
return false;
dirent = buf->current_dir;
prev = (void __user *)dirent - prev_reclen;
if (!user_write_access_begin(prev, reclen + prev_reclen))
@ -342,13 +342,13 @@ static int filldir64(struct dir_context *ctx, const char *name, int namlen,
buf->prev_reclen = reclen;
buf->current_dir = (void __user *)dirent + reclen;
buf->count -= reclen;
return 0;
return true;
efault_end:
user_write_access_end();
efault:
buf->error = -EFAULT;
return -EFAULT;
return false;
}
SYSCALL_DEFINE3(getdents64, unsigned int, fd,
@ -397,7 +397,7 @@ struct compat_readdir_callback {
int result;
};
static int compat_fillonedir(struct dir_context *ctx, const char *name,
static bool compat_fillonedir(struct dir_context *ctx, const char *name,
int namlen, loff_t offset, u64 ino,
unsigned int d_type)
{
@ -407,14 +407,14 @@ static int compat_fillonedir(struct dir_context *ctx, const char *name,
compat_ulong_t d_ino;
if (buf->result)
return -EINVAL;
return false;
buf->result = verify_dirent_name(name, namlen);
if (buf->result < 0)
return buf->result;
if (buf->result)
return false;
d_ino = ino;
if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
buf->result = -EOVERFLOW;
return -EOVERFLOW;
return false;
}
buf->result++;
dirent = buf->dirent;
@ -427,12 +427,12 @@ static int compat_fillonedir(struct dir_context *ctx, const char *name,
unsafe_put_user(namlen, &dirent->d_namlen, efault_end);
unsafe_copy_dirent_name(dirent->d_name, name, namlen, efault_end);
user_write_access_end();
return 0;
return true;
efault_end:
user_write_access_end();
efault:
buf->result = -EFAULT;
return -EFAULT;
return false;
}
COMPAT_SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
@ -471,7 +471,7 @@ struct compat_getdents_callback {
int error;
};
static int compat_filldir(struct dir_context *ctx, const char *name, int namlen,
static bool compat_filldir(struct dir_context *ctx, const char *name, int namlen,
loff_t offset, u64 ino, unsigned int d_type)
{
struct compat_linux_dirent __user *dirent, *prev;
@ -484,18 +484,18 @@ static int compat_filldir(struct dir_context *ctx, const char *name, int namlen,
buf->error = verify_dirent_name(name, namlen);
if (unlikely(buf->error))
return buf->error;
return false;
buf->error = -EINVAL; /* only used if we fail.. */
if (reclen > buf->count)
return -EINVAL;
return false;
d_ino = ino;
if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
buf->error = -EOVERFLOW;
return -EOVERFLOW;
return false;
}
prev_reclen = buf->prev_reclen;
if (prev_reclen && signal_pending(current))
return -EINTR;
return false;
dirent = buf->current_dir;
prev = (void __user *) dirent - prev_reclen;
if (!user_write_access_begin(prev, reclen + prev_reclen))
@ -511,12 +511,12 @@ static int compat_filldir(struct dir_context *ctx, const char *name, int namlen,
buf->prev_reclen = reclen;
buf->current_dir = (void __user *)dirent + reclen;
buf->count -= reclen;
return 0;
return true;
efault_end:
user_write_access_end();
efault:
buf->error = -EFAULT;
return -EFAULT;
return false;
}
COMPAT_SYSCALL_DEFINE3(getdents, unsigned int, fd,

20
fs/reiserfs/xattr.c
View file

@ -189,7 +189,7 @@ struct reiserfs_dentry_buf {
struct dentry *dentries[8];
};
static int
static bool
fill_with_dentries(struct dir_context *ctx, const char *name, int namelen,
loff_t offset, u64 ino, unsigned int d_type)
{
@ -200,16 +200,16 @@ fill_with_dentries(struct dir_context *ctx, const char *name, int namelen,
WARN_ON_ONCE(!inode_is_locked(d_inode(dbuf->xadir)));
if (dbuf->count == ARRAY_SIZE(dbuf->dentries))
return -ENOSPC;
return false;
if (name[0] == '.' && (namelen < 2 ||
(namelen == 2 && name[1] == '.')))
return 0;
return true;
dentry = lookup_one_len(name, dbuf->xadir, namelen);
if (IS_ERR(dentry)) {
dbuf->err = PTR_ERR(dentry);
return PTR_ERR(dentry);
return false;
} else if (d_really_is_negative(dentry)) {
/* A directory entry exists, but no file? */
reiserfs_error(dentry->d_sb, "xattr-20003",
@ -218,11 +218,11 @@ fill_with_dentries(struct dir_context *ctx, const char *name, int namelen,
dentry, dbuf->xadir);
dput(dentry);
dbuf->err = -EIO;
return -EIO;
return false;
}
dbuf->dentries[dbuf->count++] = dentry;
return 0;
return true;
}
static void
@ -797,7 +797,7 @@ struct listxattr_buf {
struct dentry *dentry;
};
static int listxattr_filler(struct dir_context *ctx, const char *name,
static bool listxattr_filler(struct dir_context *ctx, const char *name,
int namelen, loff_t offset, u64 ino,
unsigned int d_type)
{
@ -813,19 +813,19 @@ static int listxattr_filler(struct dir_context *ctx, const char *name,
name);
if (!handler /* Unsupported xattr name */ ||
(handler->list && !handler->list(b->dentry)))
return 0;
return true;
size = namelen + 1;
if (b->buf) {
if (b->pos + size > b->size) {
b->pos = -ERANGE;
return -ERANGE;
return false;
}
memcpy(b->buf + b->pos, name, namelen);
b->buf[b->pos + namelen] = 0;
}
b->pos += size;
}
return 0;
return true;
}
/*

8
fs/xfs/scrub/dir.c
View file

@ -99,7 +99,7 @@ xchk_dir_check_ftype(
* we check the inode number to make sure it's sane, then we check that
* we can look up this filename. Finally, we check the ftype.
*/
STATIC int
STATIC bool
xchk_dir_actor(
struct dir_context *dir_iter,
const char *name,
@ -124,7 +124,7 @@ xchk_dir_actor(
xfs_dir2_dataptr_to_db(mp->m_dir_geo, pos));
if (xchk_should_terminate(sdc->sc, &error))
return error;
return !error;
/* Does this inode number make sense? */
if (!xfs_verify_dir_ino(mp, ino)) {
@ -191,8 +191,8 @@ xchk_dir_actor(
* and return zero to xchk_directory.
*/
if (error == 0 && sdc->sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
return -EFSCORRUPTED;
return error;
return false;
return !error;
}
/* Scrub a directory btree record. */

4
fs/xfs/scrub/parent.c
View file

@ -38,7 +38,7 @@ struct xchk_parent_ctx {
};
/* Look for a single entry in a directory pointing to an inode. */
STATIC int
STATIC bool
xchk_parent_actor(
struct dir_context *dc,
const char *name,
@ -62,7 +62,7 @@ xchk_parent_actor(
if (xchk_should_terminate(spc->sc, &error))
spc->cancelled = true;
return error;
return !error;
}
/* Count the number of dentries in the parent dir that point to this inode. */

9
include/linux/fs.h
View file

@ -2038,9 +2038,10 @@ umode_t mode_strip_sgid(struct user_namespace *mnt_userns,
* the kernel specify what kind of dirent layout it wants to have.
* This allows the kernel to read directories into kernel space or
* to have different dirent layouts depending on the binary type.
* Return 'true' to keep going and 'false' if there are no more entries.
*/
struct dir_context;
typedef int (*filldir_t)(struct dir_context *, const char *, int, loff_t, u64,
typedef bool (*filldir_t)(struct dir_context *, const char *, int, loff_t, u64,
unsigned);
struct dir_context {
@ -3540,17 +3541,17 @@ static inline bool dir_emit(struct dir_context *ctx,
const char *name, int namelen,
u64 ino, unsigned type)
{
return ctx->actor(ctx, name, namelen, ctx->pos, ino, type) == 0;
return ctx->actor(ctx, name, namelen, ctx->pos, ino, type);
}
static inline bool dir_emit_dot(struct file *file, struct dir_context *ctx)
{
return ctx->actor(ctx, ".", 1, ctx->pos,
file->f_path.dentry->d_inode->i_ino, DT_DIR) == 0;
file->f_path.dentry->d_inode->i_ino, DT_DIR);
}
static inline bool dir_emit_dotdot(struct file *file, struct dir_context *ctx)
{
return ctx->actor(ctx, "..", 2, ctx->pos,
parent_ino(file->f_path.dentry), DT_DIR) == 0;
parent_ino(file->f_path.dentry), DT_DIR);
}
static inline bool dir_emit_dots(struct file *file, struct dir_context *ctx)
{