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leases: move lock allocation earlier in generic_setlease() 

In generic_setlease(), the struct file_lock is allocated after tests for the
presence of conflicting readers/writers is done, despite the fact that the
allocation might block; this patch moves the allocation earlier.  A subsequent
set of patches will rely on this behavior to properly serialize between a
modified __break_lease() and generic_setlease().

Signed-off-by: David M. Richter <richterd@citi.umich.edu>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
David M. Richter 2008-04-23 16:29:01 -04:00 committed by J. Bruce Fields
parent 288b2fd825
commit 1908555767
1 changed files with 5 additions and 5 deletions
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10
fs/locks.c
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@ -1368,6 +1368,11 @@ int generic_setlease(struct file *filp, long arg, struct file_lock **flp)
lease = *flp;
if (arg != F_UNLCK) {
error = -ENOMEM;
new_fl = locks_alloc_lock();
if (new_fl == NULL)
goto out;
error = -EAGAIN;
if ((arg == F_RDLCK) && (atomic_read(&inode->i_writecount) > 0))
goto out;
@ -1375,11 +1380,6 @@ int generic_setlease(struct file *filp, long arg, struct file_lock **flp)
&& ((atomic_read(&dentry->d_count) > 1)
|| (atomic_read(&inode->i_count) > 1)))
goto out;
error = -ENOMEM;
new_fl = locks_alloc_lock();
if (new_fl == NULL)
goto out;
}
/*