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Subject[PATCH v2 2/3] ceph: don't NULL terminate virtual xattr strings
Date
The convention with xattrs is to not NULL terminate string data in the
value. Have ceph use snprintf_noterm to populate virtual xattrs.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
fs/ceph/xattr.c | 44 +++++++++++++++++++++++---------------------
1 file changed, 23 insertions(+), 21 deletions(-)

diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index 6621d27e64f5..a1cd9613be98 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -71,13 +71,13 @@ static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val,
down_read(&osdc->lock);
pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
if (pool_name) {
- len = snprintf(buf, sizeof(buf),
+ len = snprintf_noterm(buf, sizeof(buf),
"stripe_unit=%u stripe_count=%u object_size=%u pool=",
ci->i_layout.stripe_unit, ci->i_layout.stripe_count,
ci->i_layout.object_size);
total_len = len + strlen(pool_name);
} else {
- len = snprintf(buf, sizeof(buf),
+ len = snprintf_noterm(buf, sizeof(buf),
"stripe_unit=%u stripe_count=%u object_size=%u pool=%lld",
ci->i_layout.stripe_unit, ci->i_layout.stripe_count,
ci->i_layout.object_size, (unsigned long long)pool);
@@ -115,19 +115,19 @@ static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val,
static size_t ceph_vxattrcb_layout_stripe_unit(struct ceph_inode_info *ci,
char *val, size_t size)
{
- return snprintf(val, size, "%u", ci->i_layout.stripe_unit);
+ return snprintf_noterm(val, size, "%u", ci->i_layout.stripe_unit);
}

static size_t ceph_vxattrcb_layout_stripe_count(struct ceph_inode_info *ci,
char *val, size_t size)
{
- return snprintf(val, size, "%u", ci->i_layout.stripe_count);
+ return snprintf_noterm(val, size, "%u", ci->i_layout.stripe_count);
}

static size_t ceph_vxattrcb_layout_object_size(struct ceph_inode_info *ci,
char *val, size_t size)
{
- return snprintf(val, size, "%u", ci->i_layout.object_size);
+ return snprintf_noterm(val, size, "%u", ci->i_layout.object_size);
}

static size_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci,
@@ -142,9 +142,10 @@ static size_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci,
down_read(&osdc->lock);
pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
if (pool_name)
- ret = snprintf(val, size, "%s", pool_name);
+ ret = snprintf_noterm(val, size, "%s", pool_name);
else
- ret = snprintf(val, size, "%lld", (unsigned long long)pool);
+ ret = snprintf_noterm(val, size, "%lld",
+ (unsigned long long)pool);
up_read(&osdc->lock);
return ret;
}
@@ -155,7 +156,7 @@ static size_t ceph_vxattrcb_layout_pool_namespace(struct ceph_inode_info *ci,
int ret = 0;
struct ceph_string *ns = ceph_try_get_string(ci->i_layout.pool_ns);
if (ns) {
- ret = snprintf(val, size, "%.*s", (int)ns->len, ns->str);
+ ret = snprintf_noterm(val, size, "%.*s", (int)ns->len, ns->str);
ceph_put_string(ns);
}
return ret;
@@ -166,49 +167,50 @@ static size_t ceph_vxattrcb_layout_pool_namespace(struct ceph_inode_info *ci,
static size_t ceph_vxattrcb_dir_entries(struct ceph_inode_info *ci, char *val,
size_t size)
{
- return snprintf(val, size, "%lld", ci->i_files + ci->i_subdirs);
+ return snprintf_noterm(val, size, "%lld", ci->i_files + ci->i_subdirs);
}

static size_t ceph_vxattrcb_dir_files(struct ceph_inode_info *ci, char *val,
size_t size)
{
- return snprintf(val, size, "%lld", ci->i_files);
+ return snprintf_noterm(val, size, "%lld", ci->i_files);
}

static size_t ceph_vxattrcb_dir_subdirs(struct ceph_inode_info *ci, char *val,
size_t size)
{
- return snprintf(val, size, "%lld", ci->i_subdirs);
+ return snprintf_noterm(val, size, "%lld", ci->i_subdirs);
}

static size_t ceph_vxattrcb_dir_rentries(struct ceph_inode_info *ci, char *val,
size_t size)
{
- return snprintf(val, size, "%lld", ci->i_rfiles + ci->i_rsubdirs);
+ return snprintf_noterm(val, size, "%lld",
+ ci->i_rfiles + ci->i_rsubdirs);
}

static size_t ceph_vxattrcb_dir_rfiles(struct ceph_inode_info *ci, char *val,
size_t size)
{
- return snprintf(val, size, "%lld", ci->i_rfiles);
+ return snprintf_noterm(val, size, "%lld", ci->i_rfiles);
}

static size_t ceph_vxattrcb_dir_rsubdirs(struct ceph_inode_info *ci, char *val,
size_t size)
{
- return snprintf(val, size, "%lld", ci->i_rsubdirs);
+ return snprintf_noterm(val, size, "%lld", ci->i_rsubdirs);
}

static size_t ceph_vxattrcb_dir_rbytes(struct ceph_inode_info *ci, char *val,
size_t size)
{
- return snprintf(val, size, "%lld", ci->i_rbytes);
+ return snprintf_noterm(val, size, "%lld", ci->i_rbytes);
}

static size_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val,
size_t size)
{
- return snprintf(val, size, "%lld.%09ld", ci->i_rctime.tv_sec,
+ return snprintf_noterm(val, size, "%lld.%09ld", ci->i_rctime.tv_sec,
ci->i_rctime.tv_nsec);
}

@@ -221,7 +223,7 @@ static bool ceph_vxattrcb_dir_pin_exists(struct ceph_inode_info *ci)
static size_t ceph_vxattrcb_dir_pin(struct ceph_inode_info *ci, char *val,
size_t size)
{
- return snprintf(val, size, "%d", (int)ci->i_dir_pin);
+ return snprintf_noterm(val, size, "%d", (int)ci->i_dir_pin);
}

/* quotas */
@@ -241,20 +243,20 @@ static bool ceph_vxattrcb_quota_exists(struct ceph_inode_info *ci)
static size_t ceph_vxattrcb_quota(struct ceph_inode_info *ci, char *val,
size_t size)
{
- return snprintf(val, size, "max_bytes=%llu max_files=%llu",
+ return snprintf_noterm(val, size, "max_bytes=%llu max_files=%llu",
ci->i_max_bytes, ci->i_max_files);
}

static size_t ceph_vxattrcb_quota_max_bytes(struct ceph_inode_info *ci,
char *val, size_t size)
{
- return snprintf(val, size, "%llu", ci->i_max_bytes);
+ return snprintf_noterm(val, size, "%llu", ci->i_max_bytes);
}

static size_t ceph_vxattrcb_quota_max_files(struct ceph_inode_info *ci,
char *val, size_t size)
{
- return snprintf(val, size, "%llu", ci->i_max_files);
+ return snprintf_noterm(val, size, "%llu", ci->i_max_files);
}

/* snapshots */
@@ -266,7 +268,7 @@ static bool ceph_vxattrcb_snap_btime_exists(struct ceph_inode_info *ci)
static size_t ceph_vxattrcb_snap_btime(struct ceph_inode_info *ci, char *val,
size_t size)
{
- return snprintf(val, size, "%lld.%09ld", ci->i_snap_btime.tv_sec,
+ return snprintf_noterm(val, size, "%lld.%09ld", ci->i_snap_btime.tv_sec,
ci->i_snap_btime.tv_nsec);
}

--
2.21.0
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