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nilfs2: fix buffer head leaks in calls to truncate_inode_pages()

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When block_invalidatepage was converted to block_invalidate_folio, the
fallback to block_invalidatepage in folio_invalidate() if the
address_space_operations method invalidatepage (currently
invalidate_folio) was not set, was removed.

Unfortunately, some pseudo-inodes in nilfs2 use empty_aops set by
inode_init_always_gfp() as is, or explicitly set it to
address_space_operations.  Therefore, with this change,
block_invalidatepage() is no longer called from folio_invalidate(), and as
a result, the buffer_head structures attached to these pages/folios are no
longer freed via try_to_free_buffers().

Thus, these buffer heads are now leaked by truncate_inode_pages(), which
cleans up the page cache from inode evict(), etc.

Three types of caches use empty_aops: gc inode caches and the DAT shadow
inode used by GC, and b-tree node caches.  Of these, b-tree node caches
explicitly call invalidate_mapping_pages() during cleanup, which involves
calling try_to_free_buffers(), so the leak was not visible during normal
operation but worsened when GC was performed.

Fix this issue by using address_space_operations with invalidate_folio set
to block_invalidate_folio instead of empty_aops, which will ensure the
same behavior as before.

Link: https://lkml.kernel.org/r/20241212164556.21338-1-konishi.ryusuke@gmail.com
Fixes: 7ba13abbd3 ("fs: Turn block_invalidatepage into block_invalidate_folio")
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Cc: <stable@vger.kernel.org>	[5.18+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Ryusuke Konishi 2024-12-13 01:43:28 +09:00 committed by Andrew Morton
parent a2e740e216
commit 6309b8ce98
4 changed files with 8 additions and 1 deletions
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1
fs/nilfs2/btnode.c
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@ -35,6 +35,7 @@ void nilfs_init_btnc_inode(struct inode *btnc_inode)
ii->i_flags = 0;
memset(&ii->i_bmap_data, 0, sizeof(struct nilfs_bmap));
mapping_set_gfp_mask(btnc_inode->i_mapping, GFP_NOFS);
btnc_inode->i_mapping->a_ops = &nilfs_buffer_cache_aops;
}
void nilfs_btnode_cache_clear(struct address_space *btnc)

2
fs/nilfs2/gcinode.c
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@ -163,7 +163,7 @@ int nilfs_init_gcinode(struct inode *inode)
inode->i_mode = S_IFREG;
mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
inode->i_mapping->a_ops = &empty_aops;
inode->i_mapping->a_ops = &nilfs_buffer_cache_aops;
ii->i_flags = 0;
nilfs_bmap_init_gc(ii->i_bmap);

5
fs/nilfs2/inode.c
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@ -276,6 +276,10 @@ const struct address_space_operations nilfs_aops = {
.is_partially_uptodate = block_is_partially_uptodate,
};
const struct address_space_operations nilfs_buffer_cache_aops = {
.invalidate_folio = block_invalidate_folio,
};
static int nilfs_insert_inode_locked(struct inode *inode,
struct nilfs_root *root,
unsigned long ino)
@ -681,6 +685,7 @@ struct inode *nilfs_iget_for_shadow(struct inode *inode)
NILFS_I(s_inode)->i_flags = 0;
memset(NILFS_I(s_inode)->i_bmap, 0, sizeof(struct nilfs_bmap));
mapping_set_gfp_mask(s_inode->i_mapping, GFP_NOFS);
s_inode->i_mapping->a_ops = &nilfs_buffer_cache_aops;
err = nilfs_attach_btree_node_cache(s_inode);
if (unlikely(err)) {

1
fs/nilfs2/nilfs.h
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@ -401,6 +401,7 @@ extern const struct file_operations nilfs_dir_operations;
extern const struct inode_operations nilfs_file_inode_operations;
extern const struct file_operations nilfs_file_operations;
extern const struct address_space_operations nilfs_aops;
extern const struct address_space_operations nilfs_buffer_cache_aops;
extern const struct inode_operations nilfs_dir_inode_operations;
extern const struct inode_operations nilfs_special_inode_operations;
extern const struct inode_operations nilfs_symlink_inode_operations;