From: Wang Shilong <wangsl-f...@cn.fujitsu.com>
In the original code, pretty_sizes() may return NULL in two cases:
<1> Allocating memory dynamically fails
<2> Overflow happens(size exceeds YB)
Since we are limited to 16EB both theoretically and practically
due to everything being 64bit, we can just droy zetta- and yotta-
suffixes.(suggested by David)
The original codes don't handle error gracefully and some places
forget to free memory. We can allocate memory before calling pretty_sizes(),
for example, we can use static memory allocation and we don't have to deal
with memory allocation fails.
Signed-off-by: Wang Shilong <wangsl-f...@cn.fujitsu.com>
---
V1->V2: remove zetta and yotta suffixes(Thanks to David)
and make changelog more precise
---
btrfs-calc-size.c | 10 ++++------
btrfs-fragments.c | 4 +++-
cmds-filesystem.c | 24 ++++++++++--------------
cmds-scrub.c | 5 ++---
mkfs.c | 8 ++++----
utils.c | 24 ++++++++++++------------
utils.h | 3 ++-
7 files changed, 37 insertions(+), 41 deletions(-)
diff --git a/btrfs-calc-size.c b/btrfs-calc-size.c
index c4adfb0..708b0d3 100644
--- a/btrfs-calc-size.c
+++ b/btrfs-calc-size.c
@@ -162,18 +162,16 @@ out_print:
stat.total_inline, stat.total_nodes, stat.total_leaves,
level + 1);
} else {
- char *total_size;
- char *inline_size;
+ char total_size[MAX_PRETTY_LEN];
+ char inline_size[MAX_PRETTY_LEN];
- total_size = pretty_sizes(stat.total_bytes);
- inline_size = pretty_sizes(stat.total_inline);
+ pretty_sizes(stat.total_bytes, total_size);
+ pretty_sizes(stat.total_inline, inline_size);
printf("\t%s total size, %s inline data, %Lu nodes, "
"%Lu leaves, %d levels\n",
total_size, inline_size, stat.total_nodes,
stat.total_leaves, level + 1);
- free(total_size);
- free(inline_size);
}
out:
btrfs_free_path(path);
diff --git a/btrfs-fragments.c b/btrfs-fragments.c
index a012fe1..56c8683 100644
--- a/btrfs-fragments.c
+++ b/btrfs-fragments.c
@@ -84,10 +84,12 @@ print_bg(FILE *html, char *name, u64 start, u64 len, u64
used, u64 flags,
u64 areas)
{
double frag = (double)areas / (len / 4096) * 2;
+ char str[MAX_PRETTY_LEN];
+ pretty_sizes(len, str);
fprintf(html, "<p>%s chunk starts at %lld, size is %s, %.2f%% used, "
"%.2f%% fragmented</p>\n", chunk_type(flags), start,
- pretty_sizes(len), 100.0 * used / len, 100.0 * frag);
+ str, 100.0 * used / len, 100.0 * frag);
fprintf(html, "<img src=\"%s\" border=\"1\" />\n", name);
}
diff --git a/cmds-filesystem.c b/cmds-filesystem.c
index f41a72a..a80e495 100644
--- a/cmds-filesystem.c
+++ b/cmds-filesystem.c
@@ -111,8 +111,8 @@ static int cmd_df(int argc, char **argv)
for (i = 0; i < sargs->total_spaces; i++) {
char description[80];
- char *total_bytes;
- char *used_bytes;
+ char total_bytes[MAX_PRETTY_LEN];
+ char used_bytes[MAX_PRETTY_LEN];
int written = 0;
u64 flags = sargs->spaces[i].flags;
@@ -155,8 +155,8 @@ static int cmd_df(int argc, char **argv)
written += 7;
}
- total_bytes = pretty_sizes(sargs->spaces[i].total_bytes);
- used_bytes = pretty_sizes(sargs->spaces[i].used_bytes);
+ pretty_sizes(sargs->spaces[i].total_bytes, total_bytes);
+ pretty_sizes(sargs->spaces[i].used_bytes, used_bytes);
printf("%s: total=%s, used=%s\n", description, total_bytes,
used_bytes);
}
@@ -192,7 +192,7 @@ static void print_one_uuid(struct btrfs_fs_devices
*fs_devices)
char uuidbuf[37];
struct list_head *cur;
struct btrfs_device *device;
- char *super_bytes_used;
+ char super_bytes_used[MAX_PRETTY_LEN];
u64 devs_found = 0;
u64 total;
@@ -204,25 +204,21 @@ static void print_one_uuid(struct btrfs_fs_devices
*fs_devices)
else
printf("Label: none ");
- super_bytes_used = pretty_sizes(device->super_bytes_used);
+ pretty_sizes(device->super_bytes_used, super_bytes_used);
total = device->total_devs;
printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
(unsigned long long)total, super_bytes_used);
- free(super_bytes_used);
-
list_for_each(cur, &fs_devices->devices) {
- char *total_bytes;
- char *bytes_used;
+ char total_bytes[MAX_PRETTY_LEN];
+ char bytes_used[MAX_PRETTY_LEN];
device = list_entry(cur, struct btrfs_device, dev_list);
- total_bytes = pretty_sizes(device->total_bytes);
- bytes_used = pretty_sizes(device->bytes_used);
+ pretty_sizes(device->total_bytes, total_bytes);
+ pretty_sizes(device->bytes_used, bytes_used);
printf("\tdevid %4llu size %s used %s path %s\n",
(unsigned long long)device->devid,
total_bytes, bytes_used, device->name);
- free(total_bytes);
- free(bytes_used);
devs_found++;
}
if (devs_found < total) {
diff --git a/cmds-scrub.c b/cmds-scrub.c
index c0dc584..99526f5 100644
--- a/cmds-scrub.c
+++ b/cmds-scrub.c
@@ -139,7 +139,7 @@ static void print_scrub_summary(struct btrfs_scrub_progress
*p)
{
u64 err_cnt;
u64 err_cnt2;
- char *bytes;
+ char bytes[MAX_PRETTY_LEN];
err_cnt = p->read_errors +
p->csum_errors +
@@ -151,10 +151,9 @@ static void print_scrub_summary(struct
btrfs_scrub_progress *p)
if (p->malloc_errors)
printf("*** WARNING: memory allocation failed while scrubbing. "
"results may be inaccurate\n");
- bytes = pretty_sizes(p->data_bytes_scrubbed + p->tree_bytes_scrubbed);
+ pretty_sizes(p->data_bytes_scrubbed + p->tree_bytes_scrubbed, bytes);
printf("\ttotal bytes scrubbed: %s with %llu errors\n", bytes,
max(err_cnt, err_cnt2));
- free(bytes);
if (err_cnt || err_cnt2) {
printf("\terror details:");
PRINT_SCRUB_ERROR(p->read_errors, "read");
diff --git a/mkfs.c b/mkfs.c
index b412b7e..a7487d7 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -1273,7 +1273,7 @@ int main(int ac, char **av)
u64 num_of_meta_chunks = 0;
u64 size_of_data = 0;
u64 source_dir_size = 0;
- char *pretty_buf;
+ char pretty_buf[MAX_PRETTY_LEN];
struct btrfs_super_block *super;
u64 flags;
int dev_cnt = 0;
@@ -1522,11 +1522,11 @@ raid_groups:
printf("Setting RAID5/6 feature flag\n");
}
+ pretty_sizes(btrfs_super_total_bytes(root->fs_info->super_copy),
+ pretty_buf);
printf("fs created label %s on %s\n\tnodesize %u leafsize %u "
"sectorsize %u size %s\n",
- label, first_file, nodesize, leafsize, sectorsize,
- pretty_buf =
pretty_sizes(btrfs_super_total_bytes(root->fs_info->super_copy)));
- free(pretty_buf);
+ label, first_file, nodesize, leafsize, sectorsize, pretty_buf);
printf("%s\n", BTRFS_BUILD_VERSION);
btrfs_commit_transaction(trans, root);
diff --git a/utils.c b/utils.c
index 7b4cd74..354c206 100644
--- a/utils.c
+++ b/utils.c
@@ -1152,13 +1152,11 @@ out:
}
static char *size_strs[] = { "", "KB", "MB", "GB", "TB",
- "PB", "EB", "ZB", "YB"};
-char *pretty_sizes(u64 size)
+ "PB", "EB"};
+int pretty_sizes(u64 size, char *pretty)
{
int num_divs = 0;
- int pretty_len = 16;
- float fraction;
- char *pretty;
+ double fraction;
if( size < 1024 ){
fraction = size;
@@ -1171,14 +1169,16 @@ char *pretty_sizes(u64 size)
size /= 1024;
num_divs ++;
}
-
- if (num_divs >= ARRAY_SIZE(size_strs))
- return NULL;
- fraction = (float)last_size / 1024;
+ /* size is up to 16EB, we should not come here.
+ * add a santity check here in case we may modify
+ * arrary size_strs[] in the future.
+ */
+ if (num_divs >= (ARRAY_SIZE(size_strs)))
+ num_divs = ARRAY_SIZE(size_strs) - 1;
+ fraction = (double)last_size / 1024;
}
- pretty = malloc(pretty_len);
- snprintf(pretty, pretty_len, "%.2f%s", fraction, size_strs[num_divs]);
- return pretty;
+ return snprintf(pretty, MAX_PRETTY_LEN, "%.2lf%s",
+ fraction, size_strs[num_divs]);
}
/*
diff --git a/utils.h b/utils.h
index 3c17e14..d43e790 100644
--- a/utils.h
+++ b/utils.h
@@ -23,6 +23,7 @@
#include "ctree.h"
#define BTRFS_MKFS_SYSTEM_GROUP_SIZE (4 * 1024 * 1024)
+#define MAX_PRETTY_LEN 30
int make_btrfs(int fd, const char *device, const char *label,
u64 blocks[6], u64 num_bytes, u32 nodesize,
@@ -44,7 +45,7 @@ int check_mounted_where(int fd, const char *file, char
*where, int size,
struct btrfs_fs_devices **fs_devices_mnt);
int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
int super_offset);
-char *pretty_sizes(u64 size);
+int pretty_sizes(u64 size, char *pretty);
int get_mountpt(char *dev, char *mntpt, size_t size);
int btrfs_scan_block_devices(int run_ioctl);
u64 parse_size(char *s);
--
1.7.11.7
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