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authorJan Kara <jack@suse.cz>2016-12-01 11:46:40 -0500
committerTheodore Ts'o <tytso@mit.edu>2016-12-01 11:46:40 -0500
commit6dcc693bc57f198bd85a7881eb59a915366fae1e (patch)
tree9ef8f62d5450572910d93a735aa2f7f5ea56be34 /fs/ext4
parentd14e7683ecf06aa4365ee96adf74494114341dbe (diff)
ext4: warn when page is dirtied without buffers
Warn when a page is dirtied without buffers (as that will likely lead to a crash in ext4_writepages()) or when it gets newly dirtied without the page being locked (as there is nothing that prevents buffers to get stripped just before calling set_page_dirty() under memory pressure). Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/inode.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 861f848159e8..7d95b6174980 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3714,6 +3714,13 @@ static int ext4_journalled_set_page_dirty(struct page *page)
return __set_page_dirty_nobuffers(page);
}
+static int ext4_set_page_dirty(struct page *page)
+{
+ WARN_ON_ONCE(!PageLocked(page) && !PageDirty(page));
+ WARN_ON_ONCE(!page_has_buffers(page));
+ return __set_page_dirty_buffers(page);
+}
+
static const struct address_space_operations ext4_aops = {
.readpage = ext4_readpage,
.readpages = ext4_readpages,
@@ -3721,6 +3728,7 @@ static const struct address_space_operations ext4_aops = {
.writepages = ext4_writepages,
.write_begin = ext4_write_begin,
.write_end = ext4_write_end,
+ .set_page_dirty = ext4_set_page_dirty,
.bmap = ext4_bmap,
.invalidatepage = ext4_invalidatepage,
.releasepage = ext4_releasepage,
@@ -3753,6 +3761,7 @@ static const struct address_space_operations ext4_da_aops = {
.writepages = ext4_writepages,
.write_begin = ext4_da_write_begin,
.write_end = ext4_da_write_end,
+ .set_page_dirty = ext4_set_page_dirty,
.bmap = ext4_bmap,
.invalidatepage = ext4_da_invalidatepage,
.releasepage = ext4_releasepage,