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    btrfs: Introduce extent_read_full_page_nolock() · 4b384318
    Mark Fasheh 提交于
    We want this for btrfs_extent_same. Basically readpage and friends do their
    own extent locking but for the purposes of dedupe, we want to have both
    files locked down across a set of readpage operations (so that we can
    compare data). Introduce this variant and a flag which can be set for
    extent_read_full_page() to indicate that we are already locked.
    
    Partial credit for this patch goes to Gabriel de Perthuis <g2p.code@gmail.com>
    as I have included a fix from him to the original patch which avoids a
    deadlock on compressed extents.
    Signed-off-by: NMark Fasheh <mfasheh@suse.de>
    Signed-off-by: NJosef Bacik <jbacik@fusionio.com>
    Signed-off-by: NChris Mason <chris.mason@fusionio.com>
    4b384318
extent_io.c 131.0 KB