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687857930d
Currently - on lock_ufs(), eventually - on per-inode mutex. lock_ufs() used to be mere BKL, which is much weaker, so it needed those rechecks. BKL doesn't provide any exclusion once we lose CPU; its blind replacement, OTOH, _does_. Making that per-filesystem was an atrocity, but at least we can simplify life here. And yes, we certainly need to make that sucker per-inode - these days inode.c and truncate.c uses are needed only to protect the block pointers. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>