gfs2: fiemap page fault fix

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[ Upstream commit e411d74cc5 ]

In gfs2_fiemap(), we are calling iomap_fiemap() while holding the inode
glock.  This can lead to recursive glock taking if the fiemap buffer is
memory mapped to the same inode and accessing it triggers a page fault.

Fix by disabling page faults for iomap_fiemap() and faulting in the
buffer by hand if necessary.

Fixes xfstest generic/742.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Andreas Gruenbacher 2026-02-05 15:52:57 +01:00 • committed by Sasha Levin

parent a20d029585

commit 5d2c4f182e

1 changed files with 16 additions and 0 deletions

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fs/gfs2/inode.c

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