OCFS2: Allow huge (> 16 TiB) volumes to mount
The OCFS2 developers have already done all of the hard work to allow volumes larger than 16 TiB. But there is still a "sanity check" in fs/ocfs2/super.c that prevents the mounting of such volumes, even when the cluster size and journal options would allow it. This patch replaces that sanity check with a more sophisticated one to mount a huge volume provided that (a) it is addressable by the raw word/address size of the system (borrowing a test from ext4); (b) the volume is using JBD2; and (c) the JBD2_FEATURE_INCOMPAT_64BIT flag is set on the journal. I factored out the sanity check into its own function. I also moved it from ocfs2_initialize_super() down to ocfs2_check_volume(); any earlier, and the journal will not have been initialized yet. This patch is one of a pair, and it depends on the other ("JBD2: Allow feature checks before journal recovery"). I have tested this patch on small volumes, huge volumes, and huge volumes without 64-bit block support in the journal. All of them appear to work or to fail gracefully, as appropriate. Signed-off-by: Patrick LoPresti <lopresti@gmail.com> Signed-off-by: Joel Becker <joel.becker@oracle.com>
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@ -1990,6 +1990,36 @@ static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uu
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return 0;
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}
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/* Make sure entire volume is addressable by our journal. Requires
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osb_clusters_at_boot to be valid and for the journal to have been
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initialized by ocfs2_journal_init(). */
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static int ocfs2_journal_addressable(struct ocfs2_super *osb)
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{
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int status = 0;
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u64 max_block =
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ocfs2_clusters_to_blocks(osb->sb,
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osb->osb_clusters_at_boot) - 1;
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/* 32-bit block number is always OK. */
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if (max_block <= (u32)~0ULL)
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goto out;
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/* Volume is "huge", so see if our journal is new enough to
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support it. */
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if (!(OCFS2_HAS_COMPAT_FEATURE(osb->sb,
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OCFS2_FEATURE_COMPAT_JBD2_SB) &&
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jbd2_journal_check_used_features(osb->journal->j_journal, 0, 0,
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JBD2_FEATURE_INCOMPAT_64BIT))) {
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mlog(ML_ERROR, "The journal cannot address the entire volume. "
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"Enable the 'block64' journal option with tunefs.ocfs2");
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status = -EFBIG;
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goto out;
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}
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out:
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return status;
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}
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static int ocfs2_initialize_super(struct super_block *sb,
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struct buffer_head *bh,
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int sector_size,
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@ -2002,6 +2032,7 @@ static int ocfs2_initialize_super(struct super_block *sb,
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struct ocfs2_journal *journal;
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__le32 uuid_net_key;
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struct ocfs2_super *osb;
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u64 total_blocks;
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mlog_entry_void();
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@ -2214,11 +2245,15 @@ static int ocfs2_initialize_super(struct super_block *sb,
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goto bail;
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}
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if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
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> (u32)~0UL) {
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mlog(ML_ERROR, "Volume might try to write to blocks beyond "
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"what jbd can address in 32 bits.\n");
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status = -EINVAL;
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total_blocks = ocfs2_clusters_to_blocks(osb->sb,
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le32_to_cpu(di->i_clusters));
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status = generic_check_addressable(osb->sb->s_blocksize_bits,
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total_blocks);
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if (status) {
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mlog(ML_ERROR, "Volume too large "
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"to mount safely on this system");
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status = -EFBIG;
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goto bail;
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}
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@ -2380,6 +2415,12 @@ static int ocfs2_check_volume(struct ocfs2_super *osb)
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goto finally;
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}
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/* Now that journal has been initialized, check to make sure
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entire volume is addressable. */
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status = ocfs2_journal_addressable(osb);
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if (status)
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goto finally;
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/* If the journal was unmounted cleanly then we don't want to
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* recover anything. Otherwise, journal_load will do that
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* dirty work for us :) */
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