dax_entry_waitqueue

Name:dax_entry_waitqueue

Proto:static wait_queue_head_t *dax_entry_waitqueue(struct xa_state *xas, void *entry, struct exceptional_entry_key *key)

Type:wait_queue_head_t

Parameter:

Type	Parameter	Name
struct xa_state *	xas
void *	entry
struct exceptional_entry_key *	key

151

index = xa_index

158

If dax_is_pmd_entry(entry) Then index &= ~The 'colour' (ie low bits) within a PMD of a page offset.

160

xa = xa

161

entry_start = index

163

hash = hash_long((unsignedlong)xa ^ index, We choose 4096 entries - same as per-zone page wait tables )

164

Return wait_table + hash

**Caller**
Name	Describe
dax_wake_entry	@entry may no longer be the entry at the index in the mapping.* The important information it's conveying is whether the entry at* this index used to be a PMD entry.
get_unlocked_entry	Look up entry in page cache, wait for it to become unlocked if it* is a DAX entry and return it. The caller must subsequently call* put_unlocked_entry() if it did not lock the entry or dax_unlock_entry()* if it did
wait_entry_unlocked	The only thing keeping the address space around is the i_pages lock* (it's cycled in clear_inode() after removing the entries from i_pages)* After we call xas_unlock_irq(), we cannot touch xas->xa.

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