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Use f_lock to protect f_flags

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Traditionally, changes to struct file->f_flags have been done under BKL
protection, or with no protection at all.  This patch causes all f_flags
changes after file open/creation time to be done under protection of
f_lock.  This allows the removal of some BKL usage and fixes a number of
longstanding (if microscopic) races.

Reviewed-by: Christoph Hellwig <[email protected]>
Cc: Al Viro <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>
This commit is contained in:
Jonathan Corbet 2009-02-06 15:25:24 -07:00
commit db1dd4d376
13 changed files with 33 additions and 9 deletions
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2
fs/fcntl.c
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@ -189,7 +189,9 @@ static int setfl(int fd, struct file * filp, unsigned long arg)
}
}
spin_lock(&filp->f_lock);
filp->f_flags = (arg & SETFL_MASK) | (filp->f_flags & ~SETFL_MASK);
spin_unlock(&filp->f_lock);
out:
unlock_kernel();
return error;