/* * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README */ /* * Written by Alexander Zarochentcev. * * The kernel part of the (on-line) reiserfs resizer. */ #include #include #include #include #include #include "reiserfs.h" #include int reiserfs_resize(struct super_block *s, unsigned long block_count_new) { int err = 0; struct reiserfs_super_block *sb; struct reiserfs_bitmap_info *bitmap; struct reiserfs_bitmap_info *info; struct reiserfs_bitmap_info *old_bitmap = SB_AP_BITMAP(s); struct buffer_head *bh; struct reiserfs_transaction_handle th; unsigned int bmap_nr_new, bmap_nr; unsigned int block_r_new, block_r; struct reiserfs_list_bitmap *jb; struct reiserfs_list_bitmap jbitmap[JOURNAL_NUM_BITMAPS]; unsigned long int block_count, free_blocks; int i; int copy_size; int depth; sb = SB_DISK_SUPER_BLOCK(s); if (SB_BLOCK_COUNT(s) >= block_count_new) { printk("can\'t shrink filesystem on-line\n"); return -EINVAL; } /* check the device size */ depth = reiserfs_write_unlock_nested(s); bh = sb_bread(s, block_count_new - 1); reiserfs_write_lock_nested(s, depth); if (!bh) { printk("reiserfs_resize: can\'t read last block\n"); return -EINVAL; } bforget(bh); /* * old disk layout detection; those partitions can be mounted, but * cannot be resized */ if (SB_BUFFER_WITH_SB(s)->b_blocknr * SB_BUFFER_WITH_SB(s)->b_size != REISERFS_DISK_OFFSET_IN_BYTES) { printk ("reiserfs_resize: unable to resize a reiserfs without distributed bitmap (fs version < 3.5.12)\n"); return -ENOTSUPP; } /* count used bits in last bitmap block */ block_r = SB_BLOCK_COUNT(s) - (reiserfs_bmap_count(s) - 1) * s->s_blocksize * 8; /* count bitmap blocks in new fs */ bmap_nr_new = block_count_new / (s->s_blocksize * 8); block_r_new = block_count_new - bmap_nr_new * s->s_blocksize * 8; if (block_r_new) bmap_nr_new++; else block_r_new = s->s_blocksize * 8; /* save old values */ block_count = SB_BLOCK_COUNT(s); bmap_nr = reiserfs_bmap_count(s); /* resizing of reiserfs bitmaps (journal and real), if needed */ if (bmap_nr_new > bmap_nr) { /* reallocate journal bitmaps */ if (reiserfs_allocate_list_bitmaps(s, jbitmap, bmap_nr_new) < 0) { printk ("reiserfs_resize: unable to allocate memory for journal bitmaps\n"); return -ENOMEM; } /* * the new journal bitmaps are zero filled, now we copy i * the bitmap node pointers from the old journal bitmap * structs, and then transfer the new data structures * into the journal struct. * * using the copy_size var below allows this code to work for * both shrinking and expanding the FS. */ copy_size = bmap_nr_new < bmap_nr ? bmap_nr_new : bmap_nr; copy_size = copy_size * sizeof(struct reiserfs_list_bitmap_node *); for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) { struct reiserfs_bitmap_node **node_tmp; jb = SB_JOURNAL(s)->j_list_bitmap + i; memcpy(jbitmap[i].bitmaps, jb->bitmaps, copy_size); /* * just in case vfree schedules on us, copy the new * pointer into the journal struct before freeing the * old one */ node_tmp = jb->bitmaps; jb->bitmaps = jbitmap[i].bitmaps; vfree(node_tmp); } /* * allocate additional bitmap blocks, reallocate * array of bitmap block pointers */ bitmap = vzalloc(sizeof(struct reiserfs_bitmap_info) * bmap_nr_new); if (!bitmap) { /* * Journal bitmaps are still supersized, but the * memory isn't leaked, so I guess it's ok */ printk("reiserfs_resize: unable to allocate memory.\n"); return -ENOMEM; } for (i = 0; i < bmap_nr; i++) bitmap[i] = old_bitmap[i]; /* * This doesn't go through the journal, but it doesn't have to. * The changes are still atomic: We're synced up when the * journal transaction begins, and the new bitmaps don't * matter if the transaction fails. */ for (i = bmap_nr; i < bmap_nr_new; i++) { int depth; /* * don't use read_bitmap_block since it will cache * the uninitialized bitmap */ depth = reiserfs_write_unlock_nested(s); bh = sb_bread(s, i * s->s_blocksize * 8); reiserfs_write_lock_nested(s, depth); if (!bh) { vfree(bitmap); return -EIO; } memset(bh->b_data, 0, sb_blocksize(sb)); reiserfs_set_le_bit(0, bh->b_data); reiserfs_cache_bitmap_metadata(s, bh, bitmap + i); set_buffer_uptodate(bh); mark_buffer_dirty(bh); depth = reiserfs_write_unlock_nested(s); sync_dirty_buffer(bh); reiserfs_write_lock_nested(s, depth); /* update bitmap_info stuff */ bitmap[i].free_count = sb_blocksize(sb) * 8 - 1; brelse(bh); } /* free old bitmap blocks array */ SB_AP_BITMAP(s) = bitmap; vfree(old_bitmap); } /* * begin transaction, if there was an error, it's fine. Yes, we have * incorrect bitmaps now, but none of it is ever going to touch the * disk anyway. */ err = journal_begin(&th, s, 10); if (err) return err; /* Extend old last bitmap block - new blocks have been made available */ info = SB_AP_BITMAP(s) + bmap_nr - 1; bh = reiserfs_read_bitmap_block(s, bmap_nr - 1); if (!bh) { int jerr = journal_end(&th); if (jerr) return jerr; return -EIO; } reiserfs_prepare_for_journal(s, bh, 1); for (i = block_r; i < s->s_blocksize * 8; i++) reiserfs_clear_le_bit(i, bh->b_data); info->free_count += s->s_blocksize * 8 - block_r; journal_mark_dirty(&th, bh); brelse(bh); /* Correct new last bitmap block - It may not be full */ info = SB_AP_BITMAP(s) + bmap_nr_new - 1; bh = reiserfs_read_bitmap_block(s, bmap_nr_new - 1); if (!bh) { int jerr = journal_end(&th); if (jerr) return jerr; return -EIO; } reiserfs_prepare_for_journal(s, bh, 1); for (i = block_r_new; i < s->s_blocksize * 8; i++) reiserfs_set_le_bit(i, bh->b_data); journal_mark_dirty(&th, bh); brelse(bh); info->free_count -= s->s_blocksize * 8 - block_r_new; /* update super */ reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1); free_blocks = SB_FREE_BLOCKS(s); PUT_SB_FREE_BLOCKS(s, free_blocks + (block_count_new - block_count - (bmap_nr_new - bmap_nr))); PUT_SB_BLOCK_COUNT(s, block_count_new); PUT_SB_BMAP_NR(s, bmap_would_wrap(bmap_nr_new) ? : bmap_nr_new); journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s)); SB_JOURNAL(s)->j_must_wait = 1; return journal_end(&th); } ct_to_ggtt() call in intel_unpin_fb_obj() returns NULL, resulting in an oops immediately afterwards as the (inlined) call to i915_vma_unpin_fence() tries to dereference it. It seems to be some race condition where the object is going away at shutdown time, since both times happened when shutting down the X server. The call chains were different: - VT ioctl(KDSETMODE, KD_TEXT): intel_cleanup_plane_fb+0x5b/0xa0 [i915] drm_atomic_helper_cleanup_planes+0x6f/0x90 [drm_kms_helper] intel_atomic_commit_tail+0x749/0xfe0 [i915] intel_atomic_commit+0x3cb/0x4f0 [i915] drm_atomic_commit+0x4b/0x50 [drm] restore_fbdev_mode+0x14c/0x2a0 [drm_kms_helper] drm_fb_helper_restore_fbdev_mode_unlocked+0x34/0x80 [drm_kms_helper] drm_fb_helper_set_par+0x2d/0x60 [drm_kms_helper] intel_fbdev_set_par+0x18/0x70 [i915] fb_set_var+0x236/0x460 fbcon_blank+0x30f/0x350 do_unblank_screen+0xd2/0x1a0 vt_ioctl+0x507/0x12a0 tty_ioctl+0x355/0xc30 do_vfs_ioctl+0xa3/0x5e0 SyS_ioctl+0x79/0x90 entry_SYSCALL_64_fastpath+0x13/0x94 - i915 unpin_work workqueue: intel_unpin_work_fn+0x58/0x140 [i915] process_one_work+0x1f1/0x480 worker_thread+0x48/0x4d0 kthread+0x101/0x140 and this patch purely papers over the issue by adding a NULL pointer check and a WARN_ON_ONCE() to avoid the oops that would then generally make the machine unresponsive. Other callers of i915_gem_object_to_ggtt() seem to also check for the returned pointer being NULL and warn about it, so this clearly has happened before in other places. [ Reported it originally to the i915 developers on Jan 8, applying the ugly workaround on my own now after triggering the problem for the second time with no feedback. This is likely to be the same bug reported as https://bugs.freedesktop.org/show_bug.cgi?id=98829 https://bugs.freedesktop.org/show_bug.cgi?id=99134 which has a patch for the underlying problem, but it hasn't gotten to me, so I'm applying the workaround. ] Cc: Daniel Vetter <daniel.vetter@intel.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Imre Deak <imre.deak@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/usb/gadget/legacy/multi.c')