A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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simplify checks for I_CLEAR/I_FREEING

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add I_CLEAR instead of replacing I_FREEING with it.  I_CLEAR is
equivalent to I_FREEING for almost all code looking at either;
it's there to keep track of having called clear_inode() exactly
once per inode lifetime, at some point after having set I_FREEING.
I_CLEAR and I_FREEING never get set at the same time with the
current code, so we can switch to setting i_flags to I_FREEING | I_CLEAR
instead of I_CLEAR without loss of information.  As the result of
such change, checks become simpler and the amount of code that needs
to know about I_CLEAR shrinks a lot.

Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Al Viro 2010-06-02 17:38:30 -04:00
commit a4ffdde6e5
11 changed files with 27 additions and 28 deletions
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16
fs/inode.c
View file

@ -317,7 +317,7 @@ void clear_inode(struct inode *inode)
bd_forget(inode);
if (S_ISCHR(inode->i_mode) && inode->i_cdev)
cd_forget(inode);
inode->i_state = I_CLEAR;
inode->i_state = I_FREEING | I_CLEAR;
}
EXPORT_SYMBOL(clear_inode);
@ -553,7 +553,7 @@ repeat:
continue;
if (!test(inode, data))
continue;
if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) {
if (inode->i_state & (I_FREEING|I_WILL_FREE)) {
__wait_on_freeing_inode(inode);
goto repeat;
}
@ -578,7 +578,7 @@ repeat:
continue;
if (inode->i_sb != sb)
continue;
if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) {
if (inode->i_state & (I_FREEING|I_WILL_FREE)) {
__wait_on_freeing_inode(inode);
goto repeat;
}
@ -840,7 +840,7 @@ EXPORT_SYMBOL(iunique);
struct inode *igrab(struct inode *inode)
{
spin_lock(&inode_lock);
if (!(inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)))
if (!(inode->i_state & (I_FREEING|I_WILL_FREE)))
__iget(inode);
else
/*
@ -1089,7 +1089,7 @@ int insert_inode_locked(struct inode *inode)
continue;
if (old->i_sb != sb)
continue;
if (old->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE))
if (old->i_state & (I_FREEING|I_WILL_FREE))
continue;
break;
}
@ -1128,7 +1128,7 @@ int insert_inode_locked4(struct inode *inode, unsigned long hashval,
continue;
if (!test(old, data))
continue;
if (old->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE))
if (old->i_state & (I_FREEING|I_WILL_FREE))
continue;
break;
}
@ -1218,7 +1218,7 @@ void generic_delete_inode(struct inode *inode)
hlist_del_init(&inode->i_hash);
spin_unlock(&inode_lock);
wake_up_inode(inode);
BUG_ON(inode->i_state != I_CLEAR);
BUG_ON(inode->i_state != (I_FREEING | I_CLEAR));
destroy_inode(inode);
}
EXPORT_SYMBOL(generic_delete_inode);
@ -1322,7 +1322,7 @@ static inline void iput_final(struct inode *inode)
void iput(struct inode *inode)
{
if (inode) {
BUG_ON(inode->i_state == I_CLEAR);
BUG_ON(inode->i_state & I_CLEAR);
if (atomic_dec_and_lock(&inode->i_count, &inode_lock))
iput_final(inode);