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introduce I_SYNC

Browse source 
I_LOCK was used for several unrelated purposes, which caused deadlock
situations in certain filesystems as a side effect.  One of the purposes
now uses the new I_SYNC bit.

Also document the various bits and change their order from historical to
logical.

[[email protected]: make fs/inode.c:wake_up_inode() static]
Signed-off-by: Joern Engel <[email protected]>
Cc: Dave Kleikamp <[email protected]>
Cc: David Chinner <[email protected]>
Cc: Anton Altaparmakov <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Signed-off-by: Adrian Bunk <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Joern Engel 2007-10-16 23:30:44 -07:00 • committed by Linus Torvalds
commit 1c0eeaf569
8 changed files with 116 additions and 42 deletions
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24
fs/inode.c
View file

@ -99,6 +99,15 @@ struct inodes_stat_t inodes_stat;
static struct kmem_cache * inode_cachep __read_mostly;
static void wake_up_inode(struct inode *inode)
{
/*
* Prevent speculative execution through spin_unlock(&inode_lock);
*/
smp_mb();
wake_up_bit(&inode->i_state, __I_LOCK);
}
static struct inode *alloc_inode(struct super_block *sb)
{
static const struct address_space_operations empty_aops;
@ -232,7 +241,7 @@ void __iget(struct inode * inode)
return;
}
atomic_inc(&inode->i_count);
if (!(inode->i_state & (I_DIRTY|I_LOCK)))
if (!(inode->i_state & (I_DIRTY|I_SYNC)))
list_move(&inode->i_list, &inode_in_use);
inodes_stat.nr_unused--;
}
@ -253,7 +262,7 @@ void clear_inode(struct inode *inode)
BUG_ON(inode->i_data.nrpages);
BUG_ON(!(inode->i_state & I_FREEING));
BUG_ON(inode->i_state & I_CLEAR);
wait_on_inode(inode);
inode_sync_wait(inode);
DQUOT_DROP(inode);
if (inode->i_sb->s_op->clear_inode)
inode->i_sb->s_op->clear_inode(inode);
@ -1071,7 +1080,7 @@ static void generic_forget_inode(struct inode *inode)
struct super_block *sb = inode->i_sb;
if (!hlist_unhashed(&inode->i_hash)) {
if (!(inode->i_state & (I_DIRTY|I_LOCK)))
if (!(inode->i_state & (I_DIRTY|I_SYNC)))
list_move(&inode->i_list, &inode_unused);
inodes_stat.nr_unused++;
if (sb->s_flags & MS_ACTIVE) {
@ -1314,15 +1323,6 @@ static void __wait_on_freeing_inode(struct inode *inode)
spin_lock(&inode_lock);
}
void wake_up_inode(struct inode *inode)
{
/*
* Prevent speculative execution through spin_unlock(&inode_lock);
*/
smp_mb();
wake_up_bit(&inode->i_state, __I_LOCK);
}
/*
* We rarely want to lock two inodes that do not have a parent/child
* relationship (such as directory, child inode) simultaneously. The