[PATCH 2/3] Add shrink_pagecache_parent
From: Li Wang <hidden>
Date: 2013-12-30 13:45:17
Also in:
linux-fsdevel, lkml
Subsystem:
filesystems (vfs and infrastructure), the rest · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds
Analogous to shrink_dcache_parent except that it collects inodes. It is not very appropriate to be put in dcache.c, but d_walk can only be invoked from here. Signed-off-by: Li Wang <redacted> Signed-off-by: Yunchuan Wen <redacted> --- fs/dcache.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+)
diff --git a/fs/dcache.c b/fs/dcache.c
index 6055d61..0fc0f80 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c@@ -1318,6 +1318,42 @@ void shrink_dcache_parent(struct dentry *parent) } EXPORT_SYMBOL(shrink_dcache_parent); +static enum d_walk_ret gather_inode(void *data, struct dentry *dentry) +{ + struct list_head *list = data; + struct inode *inode = dentry->d_inode; + + if ((inode == NULL) || ((!inode_owner_or_capable(inode)) && + (!capable(CAP_SYS_ADMIN)))) + goto out; + spin_lock(&inode->i_lock); + if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) || + (inode->i_mapping->nrpages == 0) || + (!list_empty(&inode->i_lru))) { + goto out_unlock; + } + __iget(inode); + list_add_tail(&inode->i_lru, list); +out_unlock: + spin_unlock(&inode->i_lock); +out: + return D_WALK_CONTINUE; +} + +void shrink_pagecache_parent(struct dentry *parent) +{ + LIST_HEAD(list); + struct inode *inode, *next; + + d_walk(parent, &list, gather_inode, NULL); + list_for_each_entry_safe(inode, next, &list, i_lru) { + list_del_init(&inode->i_lru); + invalidate_mapping_pages(inode->i_mapping, 0, -1); + iput(inode); + } +} +EXPORT_SYMBOL(shrink_pagecache_parent); + static enum d_walk_ret umount_collect(void *_data, struct dentry *dentry) { struct select_data *data = _data;
--
1.7.9.5
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