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authorTheodore Ts'o <tytso@mit.edu>2018-12-25 00:56:33 -0500
committerTheodore Ts'o <tytso@mit.edu>2018-12-25 00:56:33 -0500
commit2b08b1f12cd664dc7d5c84ead9ff25ae97ad5491 (patch)
treeec4e19afec1556c8aeecef9a460a1208c1a71c83 /samples/trace_events
parent812c0cab2c0dfad977605dbadf9148490ca5d93f (diff)
downloadlinux-stericsson-2b08b1f12cd664dc7d5c84ead9ff25ae97ad5491.tar.gz
ext4: fix a potential fiemap/page fault deadlock w/ inline_data
The ext4_inline_data_fiemap() function calls fiemap_fill_next_extent() while still holding the xattr semaphore. This is not necessary and it triggers a circular lockdep warning. This is because fiemap_fill_next_extent() could trigger a page fault when it writes into page which triggers a page fault. If that page is mmaped from the inline file in question, this could very well result in a deadlock. This problem can be reproduced using generic/519 with a file system configuration which has the inline_data feature enabled. Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@kernel.org
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