diff options
| -rw-r--r-- | fs/ext4/ext4.h | 3 | ||||
| -rw-r--r-- | fs/ext4/resize.c | 14 | ||||
| -rw-r--r-- | fs/ext4/super.c | 48 |
3 files changed, 47 insertions, 18 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 0df5ee102b61..464cff711ed6 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1276,6 +1276,7 @@ struct ext4_sb_info { unsigned int s_log_groups_per_flex; struct flex_groups *s_flex_groups; + ext4_group_t s_flex_groups_allocated; /* workqueue for dio unwritten */ struct workqueue_struct *dio_unwritten_wq; @@ -2055,6 +2056,8 @@ extern void ext4_superblock_csum_set(struct super_block *sb, 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 int ext4_alloc_flex_bg_array(struct super_block *sb, + ext4_group_t ngroup); extern __printf(4, 5) void __ext4_error(struct super_block *, const char *, unsigned int, const char *, ...); diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index 365d800ff8c1..3f5c67bf13a2 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -1503,6 +1503,10 @@ int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input) if (err) goto out; + err = ext4_alloc_flex_bg_array(sb, input->group + 1); + if (err) + return err; + flex_gd.count = 1; flex_gd.groups = input; flex_gd.bg_flags = &bg_flags; @@ -1662,7 +1666,7 @@ int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) unsigned long n_desc_blocks; unsigned long o_desc_blocks; unsigned long desc_blocks; - int err = 0, flexbg_size = 1; + int err = 0, flexbg_size = 1 << sbi->s_log_groups_per_flex; o_blocks_count = ext4_blocks_count(es); @@ -1721,13 +1725,13 @@ int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) goto out; } - if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG) && - es->s_log_groups_per_flex) - flexbg_size = 1 << es->s_log_groups_per_flex; - if (ext4_blocks_count(es) == n_blocks_count) goto out; + err = ext4_alloc_flex_bg_array(sb, n_group + 1); + if (err) + return err; + flex_gd = alloc_flex_gd(flexbg_size); if (flex_gd == NULL) { err = -ENOMEM; diff --git a/fs/ext4/super.c b/fs/ext4/super.c index b875ff555865..b8de488889d6 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -1925,15 +1925,45 @@ done: return res; } +int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct flex_groups *new_groups; + int size; + + if (!sbi->s_log_groups_per_flex) + return 0; + + size = ext4_flex_group(sbi, ngroup - 1) + 1; + if (size <= sbi->s_flex_groups_allocated) + return 0; + + size = roundup_pow_of_two(size * sizeof(struct flex_groups)); + new_groups = ext4_kvzalloc(size, GFP_KERNEL); + if (!new_groups) { + ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups", + size / (int) sizeof(struct flex_groups)); + return -ENOMEM; + } + + if (sbi->s_flex_groups) { + memcpy(new_groups, sbi->s_flex_groups, + (sbi->s_flex_groups_allocated * + sizeof(struct flex_groups))); + ext4_kvfree(sbi->s_flex_groups); + } + sbi->s_flex_groups = new_groups; + sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups); + return 0; +} + static int ext4_fill_flex_info(struct super_block *sb) { struct ext4_sb_info *sbi = EXT4_SB(sb); struct ext4_group_desc *gdp = NULL; - ext4_group_t flex_group_count; ext4_group_t flex_group; unsigned int groups_per_flex = 0; - size_t size; - int i; + int i, err; sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) { @@ -1942,17 +1972,9 @@ static int ext4_fill_flex_info(struct super_block *sb) } groups_per_flex = 1 << sbi->s_log_groups_per_flex; - /* We allocate both existing and potentially added groups */ - flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) + - ((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 = ext4_kvzalloc(size, GFP_KERNEL); - if (sbi->s_flex_groups == NULL) { - ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups", - flex_group_count); + err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count); + if (err) goto failed; - } for (i = 0; i < sbi->s_groups_count; i++) { gdp = ext4_get_group_desc(sb, i, NULL); |