Searched hist:e55a0de1 (Results 1 - 3 of 3) sorted by relevance
| /linux-master/fs/btrfs/ | ||
| H A D | subpage.h | diff e55a0de1 Mon Sep 27 01:22:05 MDT 2021 Qu Wenruo <wqu@suse.com> btrfs: rework page locking in __extent_writepage() Pages passed to __extent_writepage() are always locked, but they may be locked by different functions. There are two types of locked page for __extent_writepage(): - Page locked by plain lock_page() It should not have any subpage::writers count. Can be unlocked by unlock_page(). This is the most common locked page for __extent_writepage() called inside extent_write_cache_pages() or extent_write_full_page(). Rarer cases include the @locked_page from extent_write_locked_range(). - Page locked by lock_delalloc_pages() There is only one caller, all pages except @locked_page for extent_write_locked_range(). In this case, we have to call subpage helper to handle the case. So here we introduce a helper, btrfs_page_unlock_writer(), to allow __extent_writepage() to unlock different locked pages. And since for all other callers of __extent_writepage() their pages are ensured to be locked by lock_page(), also add an extra check for epd::extent_locked to unlock such pages directly. Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
| H A D | subpage.c | diff e55a0de1 Mon Sep 27 01:22:05 MDT 2021 Qu Wenruo <wqu@suse.com> btrfs: rework page locking in __extent_writepage() Pages passed to __extent_writepage() are always locked, but they may be locked by different functions. There are two types of locked page for __extent_writepage(): - Page locked by plain lock_page() It should not have any subpage::writers count. Can be unlocked by unlock_page(). This is the most common locked page for __extent_writepage() called inside extent_write_cache_pages() or extent_write_full_page(). Rarer cases include the @locked_page from extent_write_locked_range(). - Page locked by lock_delalloc_pages() There is only one caller, all pages except @locked_page for extent_write_locked_range(). In this case, we have to call subpage helper to handle the case. So here we introduce a helper, btrfs_page_unlock_writer(), to allow __extent_writepage() to unlock different locked pages. And since for all other callers of __extent_writepage() their pages are ensured to be locked by lock_page(), also add an extra check for epd::extent_locked to unlock such pages directly. Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
| H A D | extent_io.c | diff e55a0de1 Mon Sep 27 01:22:05 MDT 2021 Qu Wenruo <wqu@suse.com> btrfs: rework page locking in __extent_writepage() Pages passed to __extent_writepage() are always locked, but they may be locked by different functions. There are two types of locked page for __extent_writepage(): - Page locked by plain lock_page() It should not have any subpage::writers count. Can be unlocked by unlock_page(). This is the most common locked page for __extent_writepage() called inside extent_write_cache_pages() or extent_write_full_page(). Rarer cases include the @locked_page from extent_write_locked_range(). - Page locked by lock_delalloc_pages() There is only one caller, all pages except @locked_page for extent_write_locked_range(). In this case, we have to call subpage helper to handle the case. So here we introduce a helper, btrfs_page_unlock_writer(), to allow __extent_writepage() to unlock different locked pages. And since for all other callers of __extent_writepage() their pages are ensured to be locked by lock_page(), also add an extra check for epd::extent_locked to unlock such pages directly. Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
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