On 06/28/2010 03:32 PM, Patrick J. LoPresti wrote:
> Current version of my proposed patch is appended.
>
> The good news is that I have tested it, and it "works for me".
>
> The bad news is that it performs the check fairly late (in
> ocfs2_check_volume(), just after the call to ocfs2_journal_load()),
> because this is the earliest I have the journal flags available to
> test.
>
>
That should be ok. Afterall we have to handle journal_load()
failing for other reasons too. BTW, have you tested with cleared
INCOMPAT_64BIT journal flag?
Hopefully, we'll never trigger this condition... that is if we are
careful when making the same change in mkfs/tunefs.
> We can:
>
> (a) Run with this patch pretty much as-is; or
> (b) Move the jbd2_journal_load() call out of ocfs2_journal_load() so
> that the flags will be in memory sooner; or
> (c) Do something else (ideas welcome)
>
> Let me know what you think. Thanks!
>
> - Pat
>
>
> diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
> index 0eaa929..3db233d 100644
> --- a/fs/ocfs2/super.c
> +++ b/fs/ocfs2/super.c
> @@ -1991,6 +1991,47 @@ static int ocfs2_setup_osb_uuid(struct
> ocfs2_super *osb, const unsigned char *uu
> return 0;
> }
>
> +/* Check to make sure entire volume is addressable on this system.
> + Requires osb_clusters_at_boot to be valid and for the journal to
> + have been read by jbd2_journal_load(). */
> +static int ocfs2_check_addressable(struct ocfs2_super *osb)
> +{
> + int status = 0;
> + u64 max_block =
> + ocfs2_clusters_to_blocks(osb->sb,
> + osb->osb_clusters_at_boot) - 1;
> +
> + /* Absolute addressability check (borrowed from ext4/super.c) */
> + if ((max_block>
> + (sector_t)(~0LL)>> (osb->sb->s_blocksize_bits - 9)) ||
> + (max_block> (pgoff_t)(~0LL)>> (PAGE_CACHE_SHIFT -
> + osb->sb->s_blocksize_bits))) {
> + mlog(ML_ERROR, "Volume too large "
> + "to mount safely on this system");
> + status = -EFBIG;
> + goto out;
> + }
> +
> + /* 32-bit block number is always OK. */
> + if (max_block<= (u32)~0UL)
> + goto out;
> +
> + /* Volume is "huge", so see if our journal is new enough to
> + support it. */
> + if (!(OCFS2_HAS_COMPAT_FEATURE(osb->sb,
> + OCFS2_FEATURE_COMPAT_JBD2_SB)&&
> + jbd2_journal_check_used_features(osb->journal->j_journal, 0, 0,
> + JBD2_FEATURE_INCOMPAT_64BIT))) {
> + mlog(ML_ERROR, "The journal cannot address the entire volume. "
> + "Enable the 'block64' journal option with tunefs.ocfs2");
> + status = -EFBIG;
> + goto out;
> + }
> +
> + out:
> + return status;
> +}
> +
> static int ocfs2_initialize_super(struct super_block *sb,
> struct buffer_head *bh,
> int sector_size,
> @@ -2215,14 +2256,6 @@ static int ocfs2_initialize_super(struct super_block
> *sb,
> goto bail;
> }
>
> - if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
> - > (u32)~0UL) {
> - mlog(ML_ERROR, "Volume might try to write to blocks beyond "
> - "what jbd can address in 32 bits.\n");
> - status = -EINVAL;
> - goto bail;
> - }
> -
> if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
> sizeof(di->id2.i_super.s_uuid))) {
> mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
> @@ -2404,6 +2437,12 @@ static int ocfs2_check_volume(struct ocfs2_super *osb)
> goto finally;
> }
>
> + /* Now that journal has been loaded, check to make sure entire
> + volume is addressable. */
> + status = ocfs2_check_addressable(osb);
> + if (status)
> + goto finally;
> +
> if (dirty) {
> /* recover my local alloc if we didn't unmount cleanly. */
> status = ocfs2_begin_local_alloc_recovery(osb,
>
> _______________________________________________
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>
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