6.6-stable review patch. If anyone has any objections, please let me know.
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From: Chao Yu chao@kernel.org
[ Upstream commit c2f7c32b254006ad48f8e4efb2e7e7bf71739f17 ]
f2fs_zero_post_eof_page() may cuase more overhead due to invalidate_lock and page lookup, change as below to mitigate its overhead: - check new_size before grabbing invalidate_lock - lookup and invalidate pages only in range of [old_size, new_size]
Fixes: ba8dac350faf ("f2fs: fix to zero post-eof page") Signed-off-by: Chao Yu chao@kernel.org Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- fs/f2fs/file.c | 39 +++++++++++++++++++-------------------- 1 file changed, 19 insertions(+), 20 deletions(-)
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 20d102009f715..6267ba6ef1083 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -36,15 +36,23 @@ #include <trace/events/f2fs.h> #include <uapi/linux/f2fs.h>
-static void f2fs_zero_post_eof_page(struct inode *inode, loff_t new_size) +static void f2fs_zero_post_eof_page(struct inode *inode, + loff_t new_size, bool lock) { loff_t old_size = i_size_read(inode);
if (old_size >= new_size) return;
+ if (mapping_empty(inode->i_mapping)) + return; + + if (lock) + filemap_invalidate_lock(inode->i_mapping); /* zero or drop pages only in range of [old_size, new_size] */ - truncate_pagecache(inode, old_size); + truncate_inode_pages_range(inode->i_mapping, old_size, new_size); + if (lock) + filemap_invalidate_unlock(inode->i_mapping); }
static vm_fault_t f2fs_filemap_fault(struct vm_fault *vmf) @@ -115,9 +123,7 @@ static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf)
f2fs_bug_on(sbi, f2fs_has_inline_data(inode));
- filemap_invalidate_lock(inode->i_mapping); - f2fs_zero_post_eof_page(inode, (folio->index + 1) << PAGE_SHIFT); - filemap_invalidate_unlock(inode->i_mapping); + f2fs_zero_post_eof_page(inode, (folio->index + 1) << PAGE_SHIFT, true);
file_update_time(vmf->vma->vm_file); filemap_invalidate_lock_shared(inode->i_mapping); @@ -1077,7 +1083,7 @@ int f2fs_setattr(struct mnt_idmap *idmap, struct dentry *dentry, filemap_invalidate_lock(inode->i_mapping);
if (attr->ia_size > old_size) - f2fs_zero_post_eof_page(inode, attr->ia_size); + f2fs_zero_post_eof_page(inode, attr->ia_size, false); truncate_setsize(inode, attr->ia_size);
if (attr->ia_size <= old_size) @@ -1196,9 +1202,7 @@ static int f2fs_punch_hole(struct inode *inode, loff_t offset, loff_t len) if (ret) return ret;
- filemap_invalidate_lock(inode->i_mapping); - f2fs_zero_post_eof_page(inode, offset + len); - filemap_invalidate_unlock(inode->i_mapping); + f2fs_zero_post_eof_page(inode, offset + len, true);
pg_start = ((unsigned long long) offset) >> PAGE_SHIFT; pg_end = ((unsigned long long) offset + len) >> PAGE_SHIFT; @@ -1484,7 +1488,7 @@ static int f2fs_do_collapse(struct inode *inode, loff_t offset, loff_t len) f2fs_down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]); filemap_invalidate_lock(inode->i_mapping);
- f2fs_zero_post_eof_page(inode, offset + len); + f2fs_zero_post_eof_page(inode, offset + len, false);
f2fs_lock_op(sbi); f2fs_drop_extent_tree(inode); @@ -1608,9 +1612,7 @@ static int f2fs_zero_range(struct inode *inode, loff_t offset, loff_t len, if (ret) return ret;
- filemap_invalidate_lock(mapping); - f2fs_zero_post_eof_page(inode, offset + len); - filemap_invalidate_unlock(mapping); + f2fs_zero_post_eof_page(inode, offset + len, true);
pg_start = ((unsigned long long) offset) >> PAGE_SHIFT; pg_end = ((unsigned long long) offset + len) >> PAGE_SHIFT; @@ -1744,7 +1746,7 @@ static int f2fs_insert_range(struct inode *inode, loff_t offset, loff_t len) f2fs_down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]); filemap_invalidate_lock(mapping);
- f2fs_zero_post_eof_page(inode, offset + len); + f2fs_zero_post_eof_page(inode, offset + len, false); truncate_pagecache(inode, offset);
while (!ret && idx > pg_start) { @@ -1800,9 +1802,7 @@ static int f2fs_expand_inode_data(struct inode *inode, loff_t offset, if (err) return err;
- filemap_invalidate_lock(inode->i_mapping); - f2fs_zero_post_eof_page(inode, offset + len); - filemap_invalidate_unlock(inode->i_mapping); + f2fs_zero_post_eof_page(inode, offset + len, true);
f2fs_balance_fs(sbi, true);
@@ -4718,9 +4718,8 @@ static ssize_t f2fs_write_checks(struct kiocb *iocb, struct iov_iter *from) if (err) return err;
- filemap_invalidate_lock(inode->i_mapping); - f2fs_zero_post_eof_page(inode, iocb->ki_pos + iov_iter_count(from)); - filemap_invalidate_unlock(inode->i_mapping); + f2fs_zero_post_eof_page(inode, + iocb->ki_pos + iov_iter_count(from), true); return count; }