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authorJaegeuk Kim <jaegeuk.kim@samsung.com>2013-04-26 11:55:17 +0900
committerJaegeuk Kim <jaegeuk.kim@samsung.com>2013-04-29 11:19:32 +0900
commitafcb7ca01f47b0481e0b248d1542d0934fa70767 (patch)
tree2834b57b958d2b444d40aa8144ac60ee739507ac /fs/f2fs/data.c
parent55008d845d233396ed374473da4613cee691aa03 (diff)
f2fs: check truncation of mapping after lock_page
We call lock_page when we need to update a page after readpage. Between grab and lock page, the page can be truncated by other thread. So, we should check the page after lock_page whether it was truncated or not. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Diffstat (limited to 'fs/f2fs/data.c')
-rw-r--r--fs/f2fs/data.c18
1 files changed, 15 insertions, 3 deletions
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index eba7e84d1ffd..2db9380f5dda 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -240,7 +240,7 @@ struct page *get_lock_data_page(struct inode *inode, pgoff_t index)
if (dn.data_blkaddr == NULL_ADDR)
return ERR_PTR(-ENOENT);
-
+repeat:
page = grab_cache_page(mapping, index);
if (!page)
return ERR_PTR(-ENOMEM);
@@ -260,6 +260,10 @@ struct page *get_lock_data_page(struct inode *inode, pgoff_t index)
f2fs_put_page(page, 1);
return ERR_PTR(-EIO);
}
+ if (page->mapping != mapping) {
+ f2fs_put_page(page, 1);
+ goto repeat;
+ }
return page;
}
@@ -291,7 +295,7 @@ struct page *get_new_data_page(struct inode *inode, pgoff_t index,
}
}
f2fs_put_dnode(&dn);
-
+repeat:
page = grab_cache_page(mapping, index);
if (!page)
return ERR_PTR(-ENOMEM);
@@ -311,6 +315,10 @@ struct page *get_new_data_page(struct inode *inode, pgoff_t index,
f2fs_put_page(page, 1);
return ERR_PTR(-EIO);
}
+ if (page->mapping != mapping) {
+ f2fs_put_page(page, 1);
+ goto repeat;
+ }
}
if (new_i_size &&
@@ -611,7 +619,7 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping,
*fsdata = NULL;
f2fs_balance_fs(sbi);
-
+repeat:
page = grab_cache_page_write_begin(mapping, index, flags);
if (!page)
return -ENOMEM;
@@ -656,6 +664,10 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping,
f2fs_put_page(page, 1);
return -EIO;
}
+ if (page->mapping != mapping) {
+ f2fs_put_page(page, 1);
+ goto repeat;
+ }
}
out:
SetPageUptodate(page);