diff options
Diffstat (limited to 'fs/erofs/super.c')
| -rw-r--r-- | fs/erofs/super.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/fs/erofs/super.c b/fs/erofs/super.c index cfe454dbf415..799fef437aa8 100644 --- a/fs/erofs/super.c +++ b/fs/erofs/super.c @@ -359,7 +359,7 @@ static void erofs_default_options(struct erofs_sb_info *sbi) enum { Opt_user_xattr, Opt_acl, Opt_cache_strategy, Opt_dax, Opt_dax_enum, - Opt_device, Opt_fsid, Opt_domain_id, Opt_directio, + Opt_device, Opt_fsid, Opt_domain_id, Opt_directio, Opt_fsoffset, }; static const struct constant_table erofs_param_cache_strategy[] = { @@ -386,6 +386,7 @@ static const struct fs_parameter_spec erofs_fs_parameters[] = { fsparam_string("fsid", Opt_fsid), fsparam_string("domain_id", Opt_domain_id), fsparam_flag_no("directio", Opt_directio), + fsparam_u64("fsoffset", Opt_fsoffset), {} }; @@ -509,6 +510,9 @@ static int erofs_fc_parse_param(struct fs_context *fc, errorfc(fc, "%s option not supported", erofs_fs_parameters[opt].name); #endif break; + case Opt_fsoffset: + sbi->dif0.fsoff = result.uint_64; + break; } return 0; } @@ -649,6 +653,14 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc) } } + if (sbi->dif0.fsoff) { + if (sbi->dif0.fsoff & (sb->s_blocksize - 1)) + return invalfc(fc, "fsoffset %llu is not aligned to block size %lu", + sbi->dif0.fsoff, sb->s_blocksize); + if (erofs_is_fscache_mode(sb)) + return invalfc(fc, "cannot use fsoffset in fscache mode"); + } + if (test_opt(&sbi->opt, DAX_ALWAYS)) { if (!sbi->dif0.dax_dev) { errorfc(fc, "DAX unsupported by block device. Turning off DAX."); @@ -978,6 +990,8 @@ static int erofs_show_options(struct seq_file *seq, struct dentry *root) if (sbi->domain_id) seq_printf(seq, ",domain_id=%s", sbi->domain_id); #endif + if (sbi->dif0.fsoff) + seq_printf(seq, ",fsoffset=%llu", sbi->dif0.fsoff); return 0; } |