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-rw-r--r--fs/ext4/ext4.h3
-rw-r--r--fs/ext4/mballoc.c79
-rw-r--r--fs/ext4/resize.c8
3 files changed, 50 insertions, 40 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 464cff711ed..8b6902c4d7b 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1233,6 +1233,7 @@ struct ext4_sb_info {
spinlock_t s_md_lock;
unsigned short *s_mb_offsets;
unsigned int *s_mb_maxs;
+ unsigned int s_group_info_size;
/* tunables */
unsigned long s_stripe;
@@ -1971,6 +1972,8 @@ extern void ext4_exit_mballoc(void);
extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
struct buffer_head *bh, ext4_fsblk_t block,
unsigned long count, int flags);
+extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
+ ext4_group_t ngroups);
extern int ext4_mb_add_groupinfo(struct super_block *sb,
ext4_group_t i, struct ext4_group_desc *desc);
extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 6873571c9f4..2102c20f7e9 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -24,6 +24,7 @@
#include "ext4_jbd2.h"
#include "mballoc.h"
#include <linux/debugfs.h>
+#include <linux/log2.h>
#include <linux/slab.h>
#include <trace/events/ext4.h>
@@ -2163,6 +2164,39 @@ static struct kmem_cache *get_groupinfo_cache(int blocksize_bits)
return cachep;
}
+/*
+ * Allocate the top-level s_group_info array for the specified number
+ * of groups
+ */
+int ext4_mb_alloc_groupinfo(struct super_block *sb, ext4_group_t ngroups)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ unsigned size;
+ struct ext4_group_info ***new_groupinfo;
+
+ size = (ngroups + EXT4_DESC_PER_BLOCK(sb) - 1) >>
+ EXT4_DESC_PER_BLOCK_BITS(sb);
+ if (size <= sbi->s_group_info_size)
+ return 0;
+
+ size = roundup_pow_of_two(sizeof(*sbi->s_group_info) * size);
+ new_groupinfo = ext4_kvzalloc(size, GFP_KERNEL);
+ if (!new_groupinfo) {
+ ext4_msg(sb, KERN_ERR, "can't allocate buddy meta group");
+ return -ENOMEM;
+ }
+ if (sbi->s_group_info) {
+ memcpy(new_groupinfo, sbi->s_group_info,
+ sbi->s_group_info_size * sizeof(*sbi->s_group_info));
+ ext4_kvfree(sbi->s_group_info);
+ }
+ sbi->s_group_info = new_groupinfo;
+ sbi->s_group_info_size = size / sizeof(*sbi->s_group_info);
+ ext4_debug("allocated s_groupinfo array for %d meta_bg's\n",
+ sbi->s_group_info_size);
+ return 0;
+}
+
/* Create and initialize ext4_group_info data for the given group. */
int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group,
struct ext4_group_desc *desc)
@@ -2252,49 +2286,14 @@ static int ext4_mb_init_backend(struct super_block *sb)
ext4_group_t ngroups = ext4_get_groups_count(sb);
ext4_group_t i;
struct ext4_sb_info *sbi = EXT4_SB(sb);
- struct ext4_super_block *es = sbi->s_es;
- int num_meta_group_infos;
- int num_meta_group_infos_max;
- int array_size;
+ int err;
struct ext4_group_desc *desc;
struct kmem_cache *cachep;
- /* This is the number of blocks used by GDT */
- num_meta_group_infos = (ngroups + EXT4_DESC_PER_BLOCK(sb) -
- 1) >> EXT4_DESC_PER_BLOCK_BITS(sb);
-
- /*
- * This is the total number of blocks used by GDT including
- * the number of reserved blocks for GDT.
- * The s_group_info array is allocated with this value
- * to allow a clean online resize without a complex
- * manipulation of pointer.
- * The drawback is the unused memory when no resize
- * occurs but it's very low in terms of pages
- * (see comments below)
- * Need to handle this properly when META_BG resizing is allowed
- */
- num_meta_group_infos_max = num_meta_group_infos +
- le16_to_cpu(es->s_reserved_gdt_blocks);
+ err = ext4_mb_alloc_groupinfo(sb, ngroups);
+ if (err)
+ return err;
- /*
- * array_size is the size of s_group_info array. We round it
- * to the next power of two because this approximation is done
- * internally by kmalloc so we can have some more memory
- * for free here (e.g. may be used for META_BG resize).
- */
- array_size = 1;
- while (array_size < sizeof(*sbi->s_group_info) *
- num_meta_group_infos_max)
- array_size = array_size << 1;
- /* An 8TB filesystem with 64-bit pointers requires a 4096 byte
- * kmalloc. A 128kb malloc should suffice for a 256TB filesystem.
- * So a two level scheme suffices for now. */
- sbi->s_group_info = ext4_kvzalloc(array_size, GFP_KERNEL);
- if (sbi->s_group_info == NULL) {
- ext4_msg(sb, KERN_ERR, "can't allocate buddy meta group");
- return -ENOMEM;
- }
sbi->s_buddy_cache = new_inode(sb);
if (sbi->s_buddy_cache == NULL) {
ext4_msg(sb, KERN_ERR, "can't get new inode");
@@ -2322,7 +2321,7 @@ err_freebuddy:
cachep = get_groupinfo_cache(sb->s_blocksize_bits);
while (i-- > 0)
kmem_cache_free(cachep, ext4_get_group_info(sb, i));
- i = num_meta_group_infos;
+ i = sbi->s_group_info_size;
while (i-- > 0)
kfree(sbi->s_group_info[i]);
iput(sbi->s_buddy_cache);
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 3f5c67bf13a..f288933bf4c 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -1507,6 +1507,10 @@ int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input)
if (err)
return err;
+ err = ext4_mb_alloc_groupinfo(sb, input->group + 1);
+ if (err)
+ goto out;
+
flex_gd.count = 1;
flex_gd.groups = input;
flex_gd.bg_flags = &bg_flags;
@@ -1732,6 +1736,10 @@ int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count)
if (err)
return err;
+ err = ext4_mb_alloc_groupinfo(sb, n_group + 1);
+ if (err)
+ goto out;
+
flex_gd = alloc_flex_gd(flexbg_size);
if (flex_gd == NULL) {
err = -ENOMEM;