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ext4: update the cached overhead value in the superblock

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If we (re-)calculate the file system overhead amount and it's
different from the on-disk s_overhead_clusters value, update the
on-disk version since this can take potentially quite a while on
bigalloc file systems.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
This commit is contained in:
Theodore Ts'o 2022-04-14 22:39:00 -04:00
parent 85d825dbf4
commit eb7054212e
3 changed files with 19 additions and 0 deletions
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1
fs/ext4/ext4.h
View file

@ -3068,6 +3068,7 @@ int ext4_fileattr_set(struct user_namespace *mnt_userns,
struct dentry *dentry, struct fileattr *fa);
int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa);
extern void ext4_reset_inode_seed(struct inode *inode);
int ext4_update_overhead(struct super_block *sb);
/* migrate.c */
extern int ext4_ext_migrate(struct inode *);

16
fs/ext4/ioctl.c
View file

@ -1652,3 +1652,19 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
}
#endif
static void set_overhead(struct ext4_super_block *es, const void *arg)
{
es->s_overhead_clusters = cpu_to_le32(*((unsigned long *) arg));
}
int ext4_update_overhead(struct super_block *sb)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
if (sb_rdonly(sb) || sbi->s_overhead == 0 ||
sbi->s_overhead == le32_to_cpu(sbi->s_es->s_overhead_clusters))
return 0;
return ext4_update_superblocks_fn(sb, set_overhead, &sbi->s_overhead);
}

2
fs/ext4/super.c
View file

@ -5618,6 +5618,8 @@ static int ext4_fill_super(struct super_block *sb, struct fs_context *fc)
ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
"Quota mode: %s.", descr, ext4_quota_mode(sb));
/* Update the s_overhead_clusters if necessary */
ext4_update_overhead(sb);
return 0;
free_sbi: