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f2fs: fix avoid race between truncate and background GC

PATCH New Chao Yu 1 participant 1 message Aug 5, 2018 F2FS file system

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Chao Yu

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PATCH v2 3/4 f2fs: fix avoid race between truncate and background GC

From: Chao Yu <[email protected]>

Thread A Background GC
- f2fs_setattr isize to 0
- truncate_setsize
- gc_data_segment
- f2fs_get_read_data_page page #0
- set_page_dirty
- set_cold_data
- f2fs_truncate

- f2fs_setattr isize to 4k
- read 4k <--- hit data in cached page #0

Above race condition can cause read out invalid data in a truncated page, fix it by i_gc_rwsem[WRITE] lock.

Signed-off-by Chao Yu <[email protected]>

---
v2:
- decrease i_gc_rwsem lock coverage.

 fs/f2fs/data.c |  4 ++++
 fs/f2fs/file.c | 37 +++++++++++++++++++++++--------------
 2 files changed, 27 insertions(+), 14 deletions(-)
fs/f2fs/data.c +4 -0
index 1e6cc68fb7c4..45f043ee48bd 100644
@@ -2199,8 +2199,12 @@ static void f2fs_write_failed(struct address_space *mapping, loff_t to)
 
 	if (to > i_size) {
 		down_write(&F2FS_I(inode)->i_mmap_sem);
+		down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
+
 		truncate_pagecache(inode, i_size);
 		f2fs_truncate_blocks(inode, i_size, true);
+
+		up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
 		up_write(&F2FS_I(inode)->i_mmap_sem);
 	}
 }
fs/f2fs/file.c +23 -14
index bcffb3b608ed..84f9d15788d1 100644
@@ -796,22 +796,26 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
 	}
 
 	if (attr->ia_valid & ATTR_SIZE) {
-		if (attr->ia_size <= i_size_read(inode)) {
-			down_write(&F2FS_I(inode)->i_mmap_sem);
-			truncate_setsize(inode, attr->ia_size);
+		bool to_smaller = (attr->ia_size <= i_size_read(inode));
+
+		down_write(&F2FS_I(inode)->i_mmap_sem);
+		down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
+
+		truncate_setsize(inode, attr->ia_size);
+
+		if (to_smaller)
 			err = f2fs_truncate(inode);
-			up_write(&F2FS_I(inode)->i_mmap_sem);
-			if (err)
-				return err;
-		} else {
-			/*
-			 * do not trim all blocks after i_size if target size is
-			 * larger than i_size.
-			 */
-			down_write(&F2FS_I(inode)->i_mmap_sem);
-			truncate_setsize(inode, attr->ia_size);
-			up_write(&F2FS_I(inode)->i_mmap_sem);
+		/*
+		 * do not trim all blocks after i_size if target size is
+		 * larger than i_size.
+		 */
+		up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
+		up_write(&F2FS_I(inode)->i_mmap_sem);
+
+		if (err)
+			return err;
 
+		if (!to_smaller) {
 			/* should convert inline inode here */
 			if (!f2fs_may_inline_data(inode)) {
 				err = f2fs_convert_inline_inode(inode);

@@ -958,13 +962,18 @@ static int punch_hole(struct inode *inode, loff_t offset, loff_t len)
 
 			blk_start = (loff_t)pg_start << PAGE_SHIFT;
 			blk_end = (loff_t)pg_end << PAGE_SHIFT;
+
 			down_write(&F2FS_I(inode)->i_mmap_sem);
+			down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
+
 			truncate_inode_pages_range(mapping, blk_start,
 					blk_end - 1);
 
 			f2fs_lock_op(sbi);
 			ret = f2fs_truncate_hole(inode, pg_start, pg_end);
 			f2fs_unlock_op(sbi);
+
+			up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
 			up_write(&F2FS_I(inode)->i_mmap_sem);
 		}
 	}
Signature · 1 line
2.18.0