提交 9933fc0a 编写于 作者: T Theodore Ts'o

ext4: introduce ext4_kvmalloc(), ext4_kzalloc(), and ext4_kvfree()

Introduce new helper functions which try kmalloc, and then fall back
to vmalloc if necessary, and use them for allocating and deallocating
s_flex_groups.
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
上级 33853a0d
......@@ -1874,6 +1874,9 @@ extern int ext4_group_extend(struct super_block *sb,
ext4_fsblk_t n_blocks_count);
/* super.c */
extern void *ext4_kvmalloc(size_t size, gfp_t flags);
extern void *ext4_kvzalloc(size_t size, gfp_t flags);
extern void ext4_kvfree(void *ptr);
extern void __ext4_error(struct super_block *, const char *, unsigned int,
const char *, ...)
__attribute__ ((format (printf, 4, 5)));
......
......@@ -110,6 +110,35 @@ static struct file_system_type ext3_fs_type = {
#define IS_EXT3_SB(sb) (0)
#endif
void *ext4_kvmalloc(size_t size, gfp_t flags)
{
void *ret;
ret = kmalloc(size, flags);
if (!ret)
ret = __vmalloc(size, flags, PAGE_KERNEL);
return ret;
}
void *ext4_kvzalloc(size_t size, gfp_t flags)
{
void *ret;
ret = kmalloc(size, flags);
if (!ret)
ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
return ret;
}
void ext4_kvfree(void *ptr)
{
if (is_vmalloc_addr(ptr))
vfree(ptr);
else
kfree(ptr);
}
ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
struct ext4_group_desc *bg)
{
......@@ -791,10 +820,7 @@ static void ext4_put_super(struct super_block *sb)
for (i = 0; i < sbi->s_gdb_count; i++)
brelse(sbi->s_group_desc[i]);
kfree(sbi->s_group_desc);
if (is_vmalloc_addr(sbi->s_flex_groups))
vfree(sbi->s_flex_groups);
else
kfree(sbi->s_flex_groups);
ext4_kvfree(sbi->s_flex_groups);
percpu_counter_destroy(&sbi->s_freeblocks_counter);
percpu_counter_destroy(&sbi->s_freeinodes_counter);
percpu_counter_destroy(&sbi->s_dirs_counter);
......@@ -1977,16 +2003,12 @@ static int ext4_fill_flex_info(struct super_block *sb)
((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
size = flex_group_count * sizeof(struct flex_groups);
sbi->s_flex_groups = kzalloc(size, GFP_KERNEL);
sbi->s_flex_groups = ext4_kvzalloc(size, GFP_KERNEL);
if (sbi->s_flex_groups == NULL) {
sbi->s_flex_groups = vzalloc(size);
if (sbi->s_flex_groups == NULL) {
ext4_msg(sb, KERN_ERR,
"not enough memory for %u flex groups",
ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups",
flex_group_count);
goto failed;
}
}
for (i = 0; i < sbi->s_groups_count; i++) {
gdp = ext4_get_group_desc(sb, i, NULL);
......@@ -3750,12 +3772,8 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
}
failed_mount3:
del_timer(&sbi->s_err_report);
if (sbi->s_flex_groups) {
if (is_vmalloc_addr(sbi->s_flex_groups))
vfree(sbi->s_flex_groups);
else
kfree(sbi->s_flex_groups);
}
if (sbi->s_flex_groups)
ext4_kvfree(sbi->s_flex_groups);
percpu_counter_destroy(&sbi->s_freeblocks_counter);
percpu_counter_destroy(&sbi->s_freeinodes_counter);
percpu_counter_destroy(&sbi->s_dirs_counter);
......
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