fs/btrfs/extent_io.c

26 #include "subpage.h"
910 		/* Has preallocated memory for subpage */
913 		/* Do new allocation to attach subpage */
1252  * For subpage, one page can contain several sectors, and
1256  * This is a big problem for subpage, we shouldn't re-submit already written
1258  * This function will lookup subpage dirty bit to find which range we really
1268 	struct btrfs_subpage *subpage = folio_get_private(folio);
1290 	spin_lock_irqsave(&subpage->lock, flags);
1291 	bitmap_next_set_region(subpage->bitmaps, &range_start_bit, &range_end_bit,
1293 	spin_unlock_irqrestore(&subpage->lock, flags);
1348 			 * But we still need to clear the dirty subpage bit, or
1350 			 * writeback the sectors with subpage dirty bits,
1401 		 * function, subpage dirty bit is not cleared.
1402 		 * So clear subpage dirty bit here so next time we won't submit
1420 	 * but also empty subpage dirty bits
1744  * Submit one subpage btree page.
1748  *   For subpage, we don't rely on page locking at all.
1768 		struct btrfs_subpage *subpage = folio_get_private(folio);
1774 		 * Take private lock to ensure the subpage won't be detached
1782 		spin_lock_irqsave(&subpage->lock, flags);
1784 			      subpage->bitmaps)) {
1785 			spin_unlock_irqrestore(&subpage->lock, flags);
1799 		spin_unlock_irqrestore(&subpage->lock, flags);
3324 	struct btrfs_subpage *subpage;
3329 		subpage = folio_get_private(folio);
3330 		if (atomic_read(&subpage->eb_refs))
3336 		if (atomic_read(&subpage->readers))
3381 	 * For subpage, we can have dummy eb with folio private attached.  In
3465 	 * UNMAPPED subpage extent buffer.
3660 	 * For subpage case, we completely rely on radix tree to ensure we
3763 		 * and subpage structure now.
3833 	 * Preallocate folio private for subpage case, so that we won't
3985 	 * subpage case detaching does a btrfs_folio_dec_eb_refs() for our eb.
3987 	 * detach_extent_buffer_folio() on our remaining pages in the !subpage
3988 	 * case.  If we left eb->folios[i] populated in the subpage case we'd
4189 		bool subpage = eb->fs_info->nodesize < PAGE_SIZE;
4192 		 * For subpage case, we can have other extent buffers in the
4194 		 * have to clear page dirty without subpage lock held.
4202 		if (subpage)
4207 		if (subpage)
4232 		 * This is special handling for metadata subpage, as regular
4253 		 * This is special handling for metadata subpage, as regular
4526  * For subpage case, check if the range covered by the eb has EXTENT_UPTODATE.
4971 		 * to grab buffer, for subpage case we rely on radix tree, thus