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[PATCH] Take i_mutex in splice_from_pipe()

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The splice_actor may be calling ->prepare_write() and ->commit_write(). We
want i_mutex on the inode being written to before calling those so that we
don't race i_size changes.

The double locking behavior is done elsewhere in splice.c, and if we
eventually want _nolock variants of generic_file_splice_write(), fs modules
might have to replicate the nasty locking code. We introduce
inode_double_lock() and inode_double_unlock() to consolidate the locking
rules into one set of functions.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Mark Fasheh 2006-10-17 10:31:38 +02:00 • committed by Jens Axboe
parent ce9e3d9953
commit 62752ee198
3 changed files with 50 additions and 13 deletions
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3
include/linux/fs.h
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@ -623,6 +623,9 @@ enum inode_i_mutex_lock_class
I_MUTEX_QUOTA
};
extern void inode_double_lock(struct inode *inode1, struct inode *inode2);
extern void inode_double_unlock(struct inode *inode1, struct inode *inode2);
/*
* NOTE: in a 32bit arch with a preemptable kernel and
* an UP compile the i_size_read/write must be atomic