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erofs: rename errln/infoln/debugln to erofs_{err, info, dbg} 

Add prefix "erofs_" to these functions and print
sb->s_id as a prefix to erofs_{err, info} so that
the user knows which file system is affected.

Reported-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Link: https://lore.kernel.org/r/20190904020912.63925-23-gaoxiang25@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
alistair/sunxi64-5.4-dsi
Gao Xiang 2019-09-04 10:09:09 +08:00 committed by Greg Kroah-Hartman
parent 84947eb603
commit 4f761fa253
11 changed files with 139 additions and 90 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
fs/erofs/data.c
View File

@ -137,8 +137,9 @@ static int erofs_map_blocks_flatmode(struct inode *inode,
/* inline data should be located in one meta block */
if (erofs_blkoff(map->m_pa) + map->m_plen > PAGE_SIZE) {
errln("inline data cross block boundary @ nid %llu",
vi->nid);
erofs_err(inode->i_sb,
"inline data cross block boundary @ nid %llu",
vi->nid);
DBG_BUGON(1);
err = -EFSCORRUPTED;
goto err_out;
@ -146,8 +147,9 @@ static int erofs_map_blocks_flatmode(struct inode *inode,
map->m_flags |= EROFS_MAP_META;
} else {
errln("internal error @ nid: %llu (size %llu), m_la 0x%llx",
vi->nid, inode->i_size, map->m_la);
erofs_err(inode->i_sb,
"internal error @ nid: %llu (size %llu), m_la 0x%llx",
vi->nid, inode->i_size, map->m_la);
DBG_BUGON(1);
err = -EIO;
goto err_out;

5
fs/erofs/decompressor.c
View File

@ -161,9 +161,8 @@ static int z_erofs_lz4_decompress(struct z_erofs_decompress_req *rq, u8 *out)
inlen, rq->outputsize,
rq->outputsize);
if (ret < 0) {
errln("%s, failed to decompress, in[%p, %u, %u] out[%p, %u]",
__func__, src + inputmargin, inlen, inputmargin,
out, rq->outputsize);
erofs_err(rq->sb, "failed to decompress, in[%u, %u] out[%u]",
inlen, inputmargin, rq->outputsize);
WARN_ON(1);
print_hex_dump(KERN_DEBUG, "[ in]: ", DUMP_PREFIX_OFFSET,
16, 1, src + inputmargin, inlen, true);

17
fs/erofs/dir.c
View File

@ -16,8 +16,8 @@ static void debug_one_dentry(unsigned char d_type, const char *de_name,
memcpy(dbg_namebuf, de_name, de_namelen);
dbg_namebuf[de_namelen] = '\0';
debugln("found dirent %s de_len %u d_type %d", dbg_namebuf,
de_namelen, d_type);
erofs_dbg("found dirent %s de_len %u d_type %d", dbg_namebuf,
de_namelen, d_type);
#endif
}
@ -47,7 +47,8 @@ static int erofs_fill_dentries(struct inode *dir, struct dir_context *ctx,
/* a corrupted entry is found */
if (nameoff + de_namelen > maxsize ||
de_namelen > EROFS_NAME_LEN) {
errln("bogus dirent @ nid %llu", EROFS_I(dir)->nid);
erofs_err(dir->i_sb, "bogus dirent @ nid %llu",
EROFS_I(dir)->nid);
DBG_BUGON(1);
return -EFSCORRUPTED;
}
@ -84,8 +85,9 @@ static int erofs_readdir(struct file *f, struct dir_context *ctx)
err = -ENOMEM;
break;
} else if (IS_ERR(dentry_page)) {
errln("fail to readdir of logical block %u of nid %llu",
i, EROFS_I(dir)->nid);
erofs_err(dir->i_sb,
"fail to readdir of logical block %u of nid %llu",
i, EROFS_I(dir)->nid);
err = -EFSCORRUPTED;
break;
}
@ -96,8 +98,9 @@ static int erofs_readdir(struct file *f, struct dir_context *ctx)
if (nameoff < sizeof(struct erofs_dirent) ||
nameoff >= PAGE_SIZE) {
errln("%s, invalid de[0].nameoff %u @ nid %llu",
__func__, nameoff, EROFS_I(dir)->nid);
erofs_err(dir->i_sb,
"invalid de[0].nameoff %u @ nid %llu",
nameoff, EROFS_I(dir)->nid);
err = -EFSCORRUPTED;
goto skip_this;
}

31
fs/erofs/inode.c
View File

@ -22,8 +22,8 @@ static int erofs_read_inode(struct inode *inode, void *data)
vi->datalayout = erofs_inode_datalayout(ifmt);
if (vi->datalayout >= EROFS_INODE_DATALAYOUT_MAX) {
errln("unsupported datalayout %u of nid %llu",
vi->datalayout, vi->nid);
erofs_err(inode->i_sb, "unsupported datalayout %u of nid %llu",
vi->datalayout, vi->nid);
DBG_BUGON(1);
return -EOPNOTSUPP;
}
@ -108,8 +108,9 @@ static int erofs_read_inode(struct inode *inode, void *data)
nblks = le32_to_cpu(dic->i_u.compressed_blocks);
break;
default:
errln("unsupported on-disk inode version %u of nid %llu",
erofs_inode_version(ifmt), vi->nid);
erofs_err(inode->i_sb,
"unsupported on-disk inode version %u of nid %llu",
erofs_inode_version(ifmt), vi->nid);
DBG_BUGON(1);
return -EOPNOTSUPP;
}
@ -122,7 +123,8 @@ static int erofs_read_inode(struct inode *inode, void *data)
return 0;
bogusimode:
errln("bogus i_mode (%o) @ nid %llu", inode->i_mode, vi->nid);
erofs_err(inode->i_sb, "bogus i_mode (%o) @ nid %llu",
inode->i_mode, vi->nid);
DBG_BUGON(1);
return -EFSCORRUPTED;
}
@ -148,8 +150,9 @@ static int erofs_fill_symlink(struct inode *inode, void *data,
/* inline symlink data shouldn't cross page boundary as well */
if (m_pofs + inode->i_size > PAGE_SIZE) {
kfree(lnk);
errln("inline data cross block boundary @ nid %llu",
vi->nid);
erofs_err(inode->i_sb,
"inline data cross block boundary @ nid %llu",
vi->nid);
DBG_BUGON(1);
return -EFSCORRUPTED;
}
@ -164,7 +167,7 @@ static int erofs_fill_symlink(struct inode *inode, void *data,
static int erofs_fill_inode(struct inode *inode, int isdir)
{
struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
struct super_block *sb = inode->i_sb;
struct erofs_inode *vi = EROFS_I(inode);
struct page *page;
void *data;
@ -174,18 +177,18 @@ static int erofs_fill_inode(struct inode *inode, int isdir)
erofs_off_t inode_loc;
trace_erofs_fill_inode(inode, isdir);
inode_loc = iloc(sbi, vi->nid);
inode_loc = iloc(EROFS_SB(sb), vi->nid);
blkaddr = erofs_blknr(inode_loc);
ofs = erofs_blkoff(inode_loc);
debugln("%s, reading inode nid %llu at %u of blkaddr %u",
__func__, vi->nid, ofs, blkaddr);
erofs_dbg("%s, reading inode nid %llu at %u of blkaddr %u",
__func__, vi->nid, ofs, blkaddr);
page = erofs_get_meta_page(inode->i_sb, blkaddr);
page = erofs_get_meta_page(sb, blkaddr);
if (IS_ERR(page)) {
errln("failed to get inode (nid: %llu) page, err %ld",
vi->nid, PTR_ERR(page));
erofs_err(sb, "failed to get inode (nid: %llu) page, err %ld",
vi->nid, PTR_ERR(page));
return PTR_ERR(page);
}

14
fs/erofs/internal.h
View File

@ -22,13 +22,19 @@
#undef pr_fmt
#define pr_fmt(fmt) "erofs: " fmt
#define errln(x, ...) pr_err(x "\n", ##__VA_ARGS__)
#define infoln(x, ...) pr_info(x "\n", ##__VA_ARGS__)
__printf(3, 4) void _erofs_err(struct super_block *sb,
const char *function, const char *fmt, ...);
#define erofs_err(sb, fmt, ...) \
_erofs_err(sb, __func__, fmt "\n", ##__VA_ARGS__)
__printf(3, 4) void _erofs_info(struct super_block *sb,
const char *function, const char *fmt, ...);
#define erofs_info(sb, fmt, ...) \
_erofs_info(sb, __func__, fmt "\n", ##__VA_ARGS__)
#ifdef CONFIG_EROFS_FS_DEBUG
#define debugln(x, ...) pr_debug(x "\n", ##__VA_ARGS__)
#define erofs_dbg(x, ...) pr_debug(x "\n", ##__VA_ARGS__)
#define DBG_BUGON BUG_ON
#else
#define debugln(x, ...) ((void)0)
#define erofs_dbg(x, ...) ((void)0)
#define DBG_BUGON(x) ((void)(x))
#endif /* !CONFIG_EROFS_FS_DEBUG */

9
fs/erofs/namei.c
View File

@ -116,8 +116,9 @@ static struct page *find_target_block_classic(struct inode *dir,
if (!ndirents) {
kunmap_atomic(de);
put_page(page);
errln("corrupted dir block %d @ nid %llu",
mid, EROFS_I(dir)->nid);
erofs_err(dir->i_sb,
"corrupted dir block %d @ nid %llu",
mid, EROFS_I(dir)->nid);
DBG_BUGON(1);
page = ERR_PTR(-EFSCORRUPTED);
goto out;
@ -233,8 +234,8 @@ static struct dentry *erofs_lookup(struct inode *dir,
} else if (err) {
inode = ERR_PTR(err);
} else {
debugln("%s, %s (nid %llu) found, d_type %u", __func__,
dentry->d_name.name, nid, d_type);
erofs_dbg("%s, %s (nid %llu) found, d_type %u", __func__,
dentry->d_name.name, nid, d_type);
inode = erofs_iget(dir->i_sb, nid, d_type == FT_DIR);
}
return d_splice_alias(inode, dentry);

83
fs/erofs/super.c
View File

@ -16,6 +16,36 @@
static struct kmem_cache *erofs_inode_cachep __read_mostly;
void _erofs_err(struct super_block *sb, const char *function,
const char *fmt, ...)
{
struct va_format vaf;
va_list args;
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
pr_err("(device %s): %s: %pV", sb->s_id, function, &vaf);
va_end(args);
}
void _erofs_info(struct super_block *sb, const char *function,
const char *fmt, ...)
{
struct va_format vaf;
va_list args;
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
pr_info("(device %s): %pV", sb->s_id, &vaf);
va_end(args);
}
static void erofs_inode_init_once(void *ptr)
{
struct erofs_inode *vi = ptr;
@ -57,8 +87,9 @@ static bool check_layout_compatibility(struct super_block *sb,
/* check if current kernel meets all mandatory requirements */
if (feature & (~EROFS_ALL_FEATURE_INCOMPAT)) {
errln("unidentified incompatible feature %x, please upgrade kernel version",
feature & ~EROFS_ALL_FEATURE_INCOMPAT);
erofs_err(sb,
"unidentified incompatible feature %x, please upgrade kernel version",
feature & ~EROFS_ALL_FEATURE_INCOMPAT);
return false;
}
return true;
@ -75,7 +106,7 @@ static int erofs_read_superblock(struct super_block *sb)
bh = sb_bread(sb, 0);
if (!bh) {
errln("cannot read erofs superblock");
erofs_err(sb, "cannot read erofs superblock");
return -EIO;
}
@ -84,15 +115,15 @@ static int erofs_read_superblock(struct super_block *sb)
ret = -EINVAL;
if (le32_to_cpu(dsb->magic) != EROFS_SUPER_MAGIC_V1) {
errln("cannot find valid erofs superblock");
erofs_err(sb, "cannot find valid erofs superblock");
goto out;
}
blkszbits = dsb->blkszbits;
/* 9(512 bytes) + LOG_SECTORS_PER_BLOCK == LOG_BLOCK_SIZE */
if (blkszbits != LOG_BLOCK_SIZE) {
errln("blksize %u isn't supported on this platform",
1 << blkszbits);
erofs_err(sb, "blksize %u isn't supported on this platform",
1 << blkszbits);
goto out;
}
@ -116,7 +147,7 @@ static int erofs_read_superblock(struct super_block *sb)
ret = strscpy(sbi->volume_name, dsb->volume_name,
sizeof(dsb->volume_name));
if (ret < 0) { /* -E2BIG */
errln("bad volume name without NIL terminator");
erofs_err(sb, "bad volume name without NIL terminator");
ret = -EFSCORRUPTED;
goto out;
}
@ -127,14 +158,15 @@ out:
}
#ifdef CONFIG_EROFS_FS_ZIP
static int erofs_build_cache_strategy(struct erofs_sb_info *sbi,
static int erofs_build_cache_strategy(struct super_block *sb,
substring_t *args)
{
struct erofs_sb_info *sbi = EROFS_SB(sb);
const char *cs = match_strdup(args);
int err = 0;
if (!cs) {
errln("Not enough memory to store cache strategy");
erofs_err(sb, "Not enough memory to store cache strategy");
return -ENOMEM;
}
@ -145,17 +177,17 @@ static int erofs_build_cache_strategy(struct erofs_sb_info *sbi,
} else if (!strcmp(cs, "readaround")) {
sbi->cache_strategy = EROFS_ZIP_CACHE_READAROUND;
} else {
errln("Unrecognized cache strategy \"%s\"", cs);
erofs_err(sb, "Unrecognized cache strategy \"%s\"", cs);
err = -EINVAL;
}
kfree(cs);
return err;
}
#else
static int erofs_build_cache_strategy(struct erofs_sb_info *sbi,
static int erofs_build_cache_strategy(struct super_block *sb,
substring_t *args)
{
infoln("EROFS compression is disabled, so cache strategy is ignored");
erofs_info(sb, "EROFS compression is disabled, so cache strategy is ignored");
return 0;
}
#endif
@ -221,10 +253,10 @@ static int erofs_parse_options(struct super_block *sb, char *options)
break;
#else
case Opt_user_xattr:
infoln("user_xattr options not supported");
erofs_info(sb, "user_xattr options not supported");
break;
case Opt_nouser_xattr:
infoln("nouser_xattr options not supported");
erofs_info(sb, "nouser_xattr options not supported");
break;
#endif
#ifdef CONFIG_EROFS_FS_POSIX_ACL
@ -236,19 +268,19 @@ static int erofs_parse_options(struct super_block *sb, char *options)
break;
#else
case Opt_acl:
infoln("acl options not supported");
erofs_info(sb, "acl options not supported");
break;
case Opt_noacl:
infoln("noacl options not supported");
erofs_info(sb, "noacl options not supported");
break;
#endif
case Opt_cache_strategy:
err = erofs_build_cache_strategy(EROFS_SB(sb), args);
err = erofs_build_cache_strategy(sb, args);
if (err)
return err;
break;
default:
errln("Unrecognized mount option \"%s\" or missing value", p);
erofs_err(sb, "Unrecognized mount option \"%s\" or missing value", p);
return -EINVAL;
}
}
@ -323,7 +355,7 @@ static int erofs_fill_super(struct super_block *sb, void *data, int silent)
sb->s_magic = EROFS_SUPER_MAGIC;
if (!sb_set_blocksize(sb, EROFS_BLKSIZ)) {
errln("failed to set erofs blksize");
erofs_err(sb, "failed to set erofs blksize");
return -EINVAL;
}
@ -367,8 +399,8 @@ static int erofs_fill_super(struct super_block *sb, void *data, int silent)
return PTR_ERR(inode);
if (!S_ISDIR(inode->i_mode)) {
errln("rootino(nid %llu) is not a directory(i_mode %o)",
ROOT_NID(sbi), inode->i_mode);
erofs_err(sb, "rootino(nid %llu) is not a directory(i_mode %o)",
ROOT_NID(sbi), inode->i_mode);
iput(inode);
return -EINVAL;
}
@ -383,9 +415,8 @@ static int erofs_fill_super(struct super_block *sb, void *data, int silent)
if (err)
return err;
if (!silent)
infoln("mounted on %s with opts: %s, root inode @ nid %llu.",
sb->s_id, (char *)data, ROOT_NID(sbi));
erofs_info(sb, "mounted with opts: %s, root inode @ nid %llu.",
(char *)data, ROOT_NID(sbi));
return 0;
}
@ -404,7 +435,6 @@ static void erofs_kill_sb(struct super_block *sb)
struct erofs_sb_info *sbi;
WARN_ON(sb->s_magic != EROFS_SUPER_MAGIC);
infoln("unmounting for %s", sb->s_id);
kill_block_super(sb);
@ -443,7 +473,6 @@ static int __init erofs_module_init(void)
int err;
erofs_check_ondisk_layout_definitions();
infoln("initializing erofs " EROFS_VERSION);
erofs_inode_cachep = kmem_cache_create("erofs_inode",
sizeof(struct erofs_inode), 0,
@ -466,7 +495,6 @@ static int __init erofs_module_init(void)
if (err)
goto fs_err;
infoln("successfully to initialize erofs");
return 0;
fs_err:
@ -488,7 +516,6 @@ static void __exit erofs_module_exit(void)
/* Ensure all RCU free inodes are safe before cache is destroyed. */
rcu_barrier();
kmem_cache_destroy(erofs_inode_cachep);
infoln("successfully finalize erofs");
}
/* get filesystem statistics */

8
fs/erofs/xattr.c
View File

@ -67,13 +67,15 @@ static int init_inode_xattrs(struct inode *inode)
* undefined right now (maybe use later with some new sb feature).
*/
if (vi->xattr_isize == sizeof(struct erofs_xattr_ibody_header)) {
errln("xattr_isize %d of nid %llu is not supported yet",
vi->xattr_isize, vi->nid);
erofs_err(inode->i_sb,
"xattr_isize %d of nid %llu is not supported yet",
vi->xattr_isize, vi->nid);
ret = -EOPNOTSUPP;
goto out_unlock;
} else if (vi->xattr_isize < sizeof(struct erofs_xattr_ibody_header)) {
if (vi->xattr_isize) {
errln("bogus xattr ibody @ nid %llu", vi->nid);
erofs_err(inode->i_sb,
"bogus xattr ibody @ nid %llu", vi->nid);
DBG_BUGON(1);
ret = -EFSCORRUPTED;
goto out_unlock; /* xattr ondisk layout error */

13
fs/erofs/zdata.c
View File

@ -600,7 +600,7 @@ repeat:
}
/* go ahead the next map_blocks */
debugln("%s: [out-of-range] pos %llu", __func__, offset + cur);
erofs_dbg("%s: [out-of-range] pos %llu", __func__, offset + cur);
if (z_erofs_collector_end(clt))
fe->backmost = false;
@ -680,8 +680,8 @@ next_part:
out:
z_erofs_onlinepage_endio(page);
debugln("%s, finish page: %pK spiltted: %u map->m_llen %llu",
__func__, page, spiltted, map->m_llen);
erofs_dbg("%s, finish page: %pK spiltted: %u map->m_llen %llu",
__func__, page, spiltted, map->m_llen);
return err;
/* if some error occurred while processing this page */
@ -1340,7 +1340,7 @@ static int z_erofs_vle_normalaccess_readpage(struct file *file,
z_erofs_submit_and_unzip(inode->i_sb, &f.clt, &pagepool, true);
if (err)
errln("%s, failed to read, err [%d]", __func__, err);
erofs_err(inode->i_sb, "failed to read, err [%d]", err);
if (f.map.mpage)
put_page(f.map.mpage);
@ -1406,8 +1406,9 @@ static int z_erofs_vle_normalaccess_readpages(struct file *filp,
err = z_erofs_do_read_page(&f, page, &pagepool);
if (err)
errln("%s, readahead error at page %lu of nid %llu",
__func__, page->index, EROFS_I(inode)->nid);
erofs_err(inode->i_sb,
"readahead error at page %lu @ nid %llu",
page->index, EROFS_I(inode)->nid);
put_page(page);
}

2
fs/erofs/zdata.h
View File

@ -182,7 +182,7 @@ static inline void z_erofs_onlinepage_endio(struct page *page)
SetPageUptodate(page);
unlock_page(page);
}
debugln("%s, page %p value %x", __func__, page, atomic_read(u.o));
erofs_dbg("%s, page %p value %x", __func__, page, atomic_read(u.o));
}
#define Z_EROFS_VMAP_ONSTACK_PAGES \

37
fs/erofs/zmap.c
View File

@ -64,8 +64,8 @@ static int fill_inode_lazy(struct inode *inode)
vi->z_algorithmtype[1] = h->h_algorithmtype >> 4;
if (vi->z_algorithmtype[0] >= Z_EROFS_COMPRESSION_MAX) {
errln("unknown compression format %u for nid %llu, please upgrade kernel",
vi->z_algorithmtype[0], vi->nid);
erofs_err(sb, "unknown compression format %u for nid %llu, please upgrade kernel",
vi->z_algorithmtype[0], vi->nid);
err = -EOPNOTSUPP;
goto unmap_done;
}
@ -75,8 +75,8 @@ static int fill_inode_lazy(struct inode *inode)
((h->h_clusterbits >> 3) & 3);
if (vi->z_physical_clusterbits[0] != LOG_BLOCK_SIZE) {
errln("unsupported physical clusterbits %u for nid %llu, please upgrade kernel",
vi->z_physical_clusterbits[0], vi->nid);
erofs_err(sb, "unsupported physical clusterbits %u for nid %llu, please upgrade kernel",
vi->z_physical_clusterbits[0], vi->nid);
err = -EOPNOTSUPP;
goto unmap_done;
}
@ -335,7 +335,8 @@ static int vle_extent_lookback(struct z_erofs_maprecorder *m,
int err;
if (lcn < lookback_distance) {
errln("bogus lookback distance @ nid %llu", vi->nid);
erofs_err(m->inode->i_sb,
"bogus lookback distance @ nid %llu", vi->nid);
DBG_BUGON(1);
return -EFSCORRUPTED;
}
@ -349,8 +350,9 @@ static int vle_extent_lookback(struct z_erofs_maprecorder *m,
switch (m->type) {
case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
if (!m->delta[0]) {
errln("invalid lookback distance 0 at nid %llu",
vi->nid);
erofs_err(m->inode->i_sb,
"invalid lookback distance 0 @ nid %llu",
vi->nid);
DBG_BUGON(1);
return -EFSCORRUPTED;
}
@ -362,8 +364,9 @@ static int vle_extent_lookback(struct z_erofs_maprecorder *m,
map->m_la = (lcn << lclusterbits) | m->clusterofs;
break;
default:
errln("unknown type %u at lcn %lu of nid %llu",
m->type, lcn, vi->nid);
erofs_err(m->inode->i_sb,
"unknown type %u @ lcn %lu of nid %llu",
m->type, lcn, vi->nid);
DBG_BUGON(1);
return -EOPNOTSUPP;
}
@ -421,8 +424,9 @@ int z_erofs_map_blocks_iter(struct inode *inode,
}
/* m.lcn should be >= 1 if endoff < m.clusterofs */
if (!m.lcn) {
errln("invalid logical cluster 0 at nid %llu",
vi->nid);
erofs_err(inode->i_sb,
"invalid logical cluster 0 at nid %llu",
vi->nid);
err = -EFSCORRUPTED;
goto unmap_out;
}
@ -437,8 +441,9 @@ int z_erofs_map_blocks_iter(struct inode *inode,
goto unmap_out;
break;
default:
errln("unknown type %u at offset %llu of nid %llu",
m.type, ofs, vi->nid);
erofs_err(inode->i_sb,
"unknown type %u @ offset %llu of nid %llu",
m.type, ofs, vi->nid);
err = -EOPNOTSUPP;
goto unmap_out;
}
@ -453,9 +458,9 @@ unmap_out:
kunmap_atomic(m.kaddr);
out:
debugln("%s, m_la %llu m_pa %llu m_llen %llu m_plen %llu m_flags 0%o",
__func__, map->m_la, map->m_pa,
map->m_llen, map->m_plen, map->m_flags);
erofs_dbg("%s, m_la %llu m_pa %llu m_llen %llu m_plen %llu m_flags 0%o",
__func__, map->m_la, map->m_pa,
map->m_llen, map->m_plen, map->m_flags);
trace_z_erofs_map_blocks_iter_exit(inode, map, flags, err);