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| author | Theodore Ts'o <tytso@mit.edu> | 2022-04-14 22:39:00 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2022-04-14 22:39:00 -0400 |
| commit | eb7054212eac8b451d727bf079eae3db8c88f9d3 (patch) | |
| tree | efbfe347a0bd8c4f437b6af7cdf8f03678ce3a63 /fs/ext4/ioctl.c | |
| parent | 85d825dbf4899a69407338bae462a59aa9a37326 (diff) | |
| download | linux-eb7054212eac8b451d727bf079eae3db8c88f9d3.tar.gz | |
ext4: update the cached overhead value in the superblock
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
Diffstat (limited to 'fs/ext4/ioctl.c')
| -rw-r--r-- | fs/ext4/ioctl.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c index 992229ca2d8303..ba44fa1be70aba 100644 --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -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); +} |