[PATCH v4 3/3] fs: let filldir_t return bool instead of an error code

From: Jann Horn
Date: Fri Jan 18 2019 - 11:15:16 EST

As Al Viro pointed out, many filldir_t functions return error codes, but
all callers of filldir_t functions just check whether the return value is
non-zero (to determine whether to continue reading the directory); more
precise errors have to be signalled via struct dir_context.
Change all filldir_t functions to return bool instead of int.

Suggested-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Jann Horn <jannh@xxxxxxxxxx>
---
arch/alpha/kernel/osf_sys.c | 12 +++----
fs/afs/dir.c | 30 +++++++++--------
fs/ecryptfs/file.c | 13 ++++----
fs/exportfs/expfs.c | 8 ++---
fs/fat/dir.c | 8 ++---
fs/gfs2/export.c | 6 ++--
fs/nfsd/nfs4recover.c | 8 ++---
fs/nfsd/vfs.c | 6 ++--
fs/ocfs2/dir.c | 10 +++---
fs/ocfs2/journal.c | 14 ++++----
fs/overlayfs/readdir.c | 24 +++++++-------
fs/readdir.c | 64 ++++++++++++++++++-------------------
fs/reiserfs/xattr.c | 20 ++++++------
fs/xfs/scrub/dir.c | 8 ++---
fs/xfs/scrub/parent.c | 4 +--
include/linux/fs.h | 10 +++---
16 files changed, 125 insertions(+), 120 deletions(-)

diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
index db1c2144d477..14e5ae0dac50 100644
--- a/arch/alpha/kernel/osf_sys.c
+++ b/arch/alpha/kernel/osf_sys.c
@@ -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)
{
@@ -120,14 +120,14 @@ osf_filldir(struct dir_context *ctx, const char *name, int namlen,

buf->error = check_dirent_name(name, namlen);
if (unlikely(buf->error))
- return -EFSCORRUPTED;
+ 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;
}
if (buf->basep) {
if (put_user(offset, buf->basep))
@@ -144,10 +144,10 @@ 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,
diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 8a2562e3a316..84d74cc25127 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -26,10 +26,12 @@ static int afs_dir_open(struct inode *inode, struct file *file);
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 int 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,
- loff_t fpos, u64 ino, unsigned dtype);
+static bool afs_lookup_one_filldir(struct dir_context *ctx, const char *name,
+ int nlen, loff_t fpos, u64 ino,
+ unsigned int dtype);
+static bool afs_lookup_filldir(struct dir_context *ctx, const char *name,
+ int nlen, loff_t fpos, u64 ino,
+ unsigned int dtype);
static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
bool excl);
static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
@@ -493,7 +495,7 @@ 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 =
@@ -509,16 +511,16 @@ 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 [no]");
+ return true;
}

cookie->fid.vnode = ino;
cookie->fid.unique = dtype;
cookie->found = 1;

- _leave(" = -1 [found]");
- return -1;
+ _leave(" = false [found]");
+ return false;
}

/*
@@ -561,12 +563,12 @@ 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;
+ bool ret;

_enter("{%s,%u},%s,%u,,%llu,%u",
cookie->name.name, cookie->name.len, name, nlen,
@@ -588,11 +590,11 @@ static int afs_lookup_filldir(struct dir_context *ctx, const char *name,
cookie->fids[0].unique = dtype;
cookie->found = 1;
if (cookie->one_only)
- return -1;
+ return false;
}

- ret = cookie->nr_fids >= 50 ? -1 : 0;
- _leave(" = %d", ret);
+ ret = cookie->nr_fids < 50;
+ _leave(" = %d", (int)ret);
return ret;
}

diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c
index b76a9853325e..79af7e199ae5 100644
--- a/fs/ecryptfs/file.c
+++ b/fs/ecryptfs/file.c
@@ -67,7 +67,7 @@ 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)
{
@@ -76,6 +76,7 @@ ecryptfs_filldir(struct dir_context *ctx, const char *lower_name,
size_t name_size;
char *name;
int rc;
+ bool emit_success;

buf->filldir_called++;
rc = ecryptfs_decode_and_decrypt_filename(&name, &name_size,
@@ -86,7 +87,7 @@ ecryptfs_filldir(struct dir_context *ctx, const char *lower_name,
ecryptfs_printk(KERN_DEBUG,
"%s: Error attempting to decode and decrypt filename [%s]; rc = [%d]\n",
__func__, lower_name, rc);
- return rc;
+ return false;
}

/* Mask -EINVAL errors as these are most likely due a plaintext
@@ -95,16 +96,16 @@ 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);
+ emit_success = dir_emit(buf->caller, name, name_size, ino, d_type);
kfree(name);
- if (!rc)
+ if (emit_success)
buf->entries_written++;

- return rc;
+ return emit_success;
}

/**
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index c69927bed4ef..9f159861fb24 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -247,21 +247,21 @@ 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;
+ bool read_more = true;

buf->sequence++;
if (buf->ino == ino && len <= NAME_MAX) {
memcpy(buf->name, name, len);
buf->name[len] = '\0';
buf->found = 1;
- result = -1;
+ read_more = false;
}
- return result;
+ return read_more;
}

/**
diff --git a/fs/fat/dir.c b/fs/fat/dir.c
index 9d01db37183f..89d623ef5259 100644
--- a/fs/fat/dir.c
+++ b/fs/fat/dir.c
@@ -706,7 +706,7 @@ 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 = \
@@ -715,7 +715,7 @@ 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) { \
@@ -751,10 +751,10 @@ 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)
diff --git a/fs/gfs2/export.c b/fs/gfs2/export.c
index a332f3cd925e..20a619c14f60 100644
--- a/fs/gfs2/export.c
+++ b/fs/gfs2/export.c
@@ -69,7 +69,7 @@ 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)
{
@@ -77,12 +77,12 @@ 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,
diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index 5188f9f70c78..bcec773cf660 100644
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -250,7 +250,7 @@ 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)
{
@@ -259,14 +259,14 @@ 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
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 9824e32b2f23..4df9479f2cab 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1831,7 +1831,7 @@ 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)
{
@@ -1843,7 +1843,7 @@ 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;
@@ -1853,7 +1853,7 @@ 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, nfsd_filldir_t func,
diff --git a/fs/ocfs2/dir.c b/fs/ocfs2/dir.c
index c121abbdfc7d..0eebf587e792 100644
--- a/fs/ocfs2/dir.c
+++ b/fs/ocfs2/dir.c
@@ -2060,7 +2060,7 @@ 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)
{
@@ -2080,7 +2080,7 @@ 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) &&
@@ -2088,13 +2088,13 @@ 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,
diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index 46fd3ef2cf21..11b3c38d22e5 100644
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -2036,7 +2036,7 @@ 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)
{
@@ -2045,21 +2045,21 @@ 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))
@@ -2069,7 +2069,7 @@ 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);
@@ -2078,7 +2078,7 @@ 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,
diff --git a/fs/overlayfs/readdir.c b/fs/overlayfs/readdir.c
index cc8303a806b4..e72b84a4b470 100644
--- a/fs/overlayfs/readdir.c
+++ b/fs/overlayfs/readdir.c
@@ -173,7 +173,7 @@ 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)
{
@@ -182,19 +182,19 @@ 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,
@@ -253,7 +253,7 @@ 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)
{
@@ -526,7 +526,7 @@ 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)
{
@@ -538,11 +538,11 @@ 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,
@@ -644,7 +644,7 @@ struct ovl_readdir_translate {
int xinobits;
};

-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)
{
@@ -980,7 +980,7 @@ void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list)
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)
{
@@ -989,12 +989,12 @@ 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;
}

/*
diff --git a/fs/readdir.c b/fs/readdir.c
index 58088510bb9c..83b552263a5a 100644
--- a/fs/readdir.c
+++ b/fs/readdir.c
@@ -108,7 +108,7 @@ 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 =
@@ -117,14 +117,14 @@ 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 = check_dirent_name(name, namlen);
if (unlikely(buf->result))
- return -EFSCORRUPTED;
+ 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;
@@ -138,10 +138,10 @@ static int fillonedir(struct dir_context *ctx, const char *name, int namlen,
__copy_to_user(dirent->d_name, name, namlen) ||
__put_user(0, dirent->d_name + namlen))
goto efault;
- return 0;
+ return true;
efault:
buf->result = -EFAULT;
- return -EFAULT;
+ return false;
}

SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
@@ -186,7 +186,7 @@ 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;
@@ -198,19 +198,19 @@ static int filldir(struct dir_context *ctx, const char *name, int namlen,

buf->error = check_dirent_name(name, namlen);
if (unlikely(buf->error))
- return -EFSCORRUPTED;
+ 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;
}
dirent = buf->previous;
if (dirent) {
if (signal_pending(current))
- return -EINTR;
+ return false;
if (__put_user(offset, &dirent->d_off))
goto efault;
}
@@ -229,10 +229,10 @@ static int filldir(struct dir_context *ctx, const char *name, int namlen,
dirent = (void __user *)dirent + reclen;
buf->current_dir = dirent;
buf->count -= reclen;
- return 0;
+ return true;
efault:
buf->error = -EFAULT;
- return -EFAULT;
+ return false;
}

SYSCALL_DEFINE3(getdents, unsigned int, fd,
@@ -276,7 +276,7 @@ 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;
@@ -287,14 +287,14 @@ static int filldir64(struct dir_context *ctx, const char *name, int namlen,

buf->error = check_dirent_name(name, namlen);
if (unlikely(buf->error))
- return -EFSCORRUPTED;
+ return false;
buf->error = -EINVAL; /* only used if we fail.. */
if (reclen > buf->count)
- return -EINVAL;
+ return false;
dirent = buf->previous;
if (dirent) {
if (signal_pending(current))
- return -EINTR;
+ return false;
if (__put_user(offset, &dirent->d_off))
goto efault;
}
@@ -315,10 +315,10 @@ static int filldir64(struct dir_context *ctx, const char *name, int namlen,
dirent = (void __user *)dirent + reclen;
buf->current_dir = dirent;
buf->count -= reclen;
- return 0;
+ return true;
efault:
buf->error = -EFAULT;
- return -EFAULT;
+ return false;
}

int ksys_getdents64(unsigned int fd, struct linux_dirent64 __user *dirent,
@@ -376,7 +376,7 @@ 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)
{
@@ -389,11 +389,11 @@ static int compat_fillonedir(struct dir_context *ctx, const char *name,
return -EINVAL;
buf->result = check_dirent_name(name, namlen);
if (unlikely(buf->result))
- return -EFSCORRUPTED;
+ 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;
@@ -407,10 +407,10 @@ static int compat_fillonedir(struct dir_context *ctx, const char *name,
__copy_to_user(dirent->d_name, name, namlen) ||
__put_user(0, dirent->d_name + namlen))
goto efault;
- return 0;
+ return true;
efault:
buf->result = -EFAULT;
- return -EFAULT;
+ return false;
}

COMPAT_SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
@@ -449,8 +449,8 @@ struct compat_getdents_callback {
int error;
};

-static int compat_filldir(struct dir_context *ctx, const char *name, int namlen,
- loff_t offset, u64 ino, unsigned int d_type)
+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;
struct compat_getdents_callback *buf =
@@ -461,19 +461,19 @@ static int compat_filldir(struct dir_context *ctx, const char *name, int namlen,

buf->error = check_dirent_name(name, namlen);
if (unlikely(buf->error))
- return -EFSCORRUPTED;
+ 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;
}
dirent = buf->previous;
if (dirent) {
if (signal_pending(current))
- return -EINTR;
+ return false;
if (__put_user(offset, &dirent->d_off))
goto efault;
}
@@ -492,10 +492,10 @@ static int compat_filldir(struct dir_context *ctx, const char *name, int namlen,
dirent = (void __user *)dirent + reclen;
buf->current_dir = dirent;
buf->count -= reclen;
- return 0;
+ return true;
efault:
buf->error = -EFAULT;
- return -EFAULT;
+ return false;
}

COMPAT_SYSCALL_DEFINE3(getdents, unsigned int, fd,
diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c
index 32d8986c26fb..0d56b2a3adad 100644
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -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
@@ -780,7 +780,7 @@ 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)
{
@@ -796,19 +796,19 @@ 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;
}

/*
diff --git a/fs/xfs/scrub/dir.c b/fs/xfs/scrub/dir.c
index cd3e4d768a18..e57069a299fa 100644
--- a/fs/xfs/scrub/dir.c
+++ b/fs/xfs/scrub/dir.c
@@ -100,7 +100,7 @@ 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,
@@ -170,13 +170,13 @@ xchk_dir_actor(
goto out;
out:
/*
- * A negative error code returned here is supposed to cause the
+ * Returning false here causes the
* dir_emit caller (xfs_readdir) to abort the directory iteration
* 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. */
diff --git a/fs/xfs/scrub/parent.c b/fs/xfs/scrub/parent.c
index 1c9d7c7f64f5..9b6d9d416039 100644
--- a/fs/xfs/scrub/parent.c
+++ b/fs/xfs/scrub/parent.c
@@ -45,7 +45,7 @@ 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,
@@ -59,7 +59,7 @@ xchk_parent_actor(
spc = container_of(dc, struct xchk_parent_ctx, dc);
if (spc->ino == ino)
spc->nlink++;
- return 0;
+ return true;
}

/* Count the number of dentries in the parent dir that point to this inode. */
diff --git a/include/linux/fs.h b/include/linux/fs.h
index e14329741e3a..1d6300c41d92 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1720,9 +1720,11 @@ int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);
* 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.
+ * Returns true if the provided entry has been consumed and the
+ * filldir function should be called again for the next entry.
*/
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 {
@@ -3469,17 +3471,17 @@ 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)
{
--
2.20.1.321.g9e740568ce-goog