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authorJon Derrick <jonathan.derrick@intel.com>2018-07-02 18:45:18 -0400
committerTheodore Ts'o <tytso@mit.edu>2018-07-02 18:45:18 -0400
commita17712c8e4be4fa5404d20e9cd3b2b21eae7bc56 (patch)
tree5e7904cf0721942898da5e47ff811091252644f4 /fs/jbd2
parentbfe0a5f47ada40d7984de67e59a7d3390b9b9ecc (diff)
downloadlinux-a17712c8e4be4fa5404d20e9cd3b2b21eae7bc56.tar.bz2
ext4: check superblock mapped prior to committing
This patch attempts to close a hole leading to a BUG seen with hot removals during writes [1]. A block device (NVME namespace in this test case) is formatted to EXT4 without partitions. It's mounted and write I/O is run to a file, then the device is hot removed from the slot. The superblock attempts to be written to the drive which is no longer present. The typical chain of events leading to the BUG: ext4_commit_super() __sync_dirty_buffer() submit_bh() submit_bh_wbc() BUG_ON(!buffer_mapped(bh)); This fix checks for the superblock's buffer head being mapped prior to syncing. [1] https://www.spinics.net/lists/linux-ext4/msg56527.html Signed-off-by: Jon Derrick <jonathan.derrick@intel.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@kernel.org
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