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authorYongqiang Yang <xiaoqiangnk@gmail.com>2011-05-24 11:36:58 -0400
committerTheodore Ts'o <tytso@mit.edu>2011-05-24 11:36:58 -0400
commitb221349fa8b45d13c3650089f0514df7d1eb36c3 (patch)
tree5fb5e797c3f05294dd2e9352c05bb20b29a95d16 /fs/jbd2
parent072bd7ea74d4b60149a33967d29666bbd84e7709 (diff)
ext4: fix ext4_ext_fiemap_cb() to handle blocks before request range correctly
To get delayed-extent information, ext4_ext_fiemap_cb() looks up pagecache, it thus collects information starting from a page's head block. If blocksize < pagesize, the beginning blocks of a page may lies before the request range. So ext4_ext_fiemap_cb() should proceed ignoring them, because they has been handled before. If no mapped buffer in the range is found in the 1st page, we need to look up the 2nd page, otherwise delayed-extents after a hole will be ignored. Without this patch, xfstests 225 will hung on ext4 with 1K block. Reported-by: Amir Goldstein <amir73il@users.sourceforge.net> Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/jbd2')
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