Invoke fscache_resize_cookie() to adjust the size of the backing cache
object when setattr is called with ATTR_SIZE. This discards any data that
then lies beyond the revised EOF and frees up space.
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
---
fs/afs/inode.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index 59dc179b40cb..21a48ab74d2b 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -838,6 +838,8 @@ int afs_setattr(struct dentry *dentry, struct iattr *attr)
if (!scb)
goto error;
+ fscache_use_cookie(afs_vnode_cache(vnode), true);
+
/* flush any dirty data outstanding on a regular file */
if (S_ISREG(vnode->vfs_inode.i_mode))
filemap_write_and_wait(vnode->vfs_inode.i_mapping);
@@ -848,7 +850,7 @@ int afs_setattr(struct dentry *dentry, struct iattr *attr)
key = afs_request_key(vnode->volume->cell);
if (IS_ERR(key)) {
ret = PTR_ERR(key);
- goto error_scb;
+ goto error_unuse;
}
}
@@ -873,7 +875,11 @@ int afs_setattr(struct dentry *dentry, struct iattr *attr)
if (!(attr->ia_valid & ATTR_FILE))
key_put(key);
-error_scb:
+ if ((attr->ia_valid & ATTR_SIZE) && ret == 0)
+ fscache_resize_cookie(afs_vnode_cache(vnode), scb->status.size);
+
+error_unuse:
+ fscache_unuse_cookie(afs_vnode_cache(vnode), NULL, NULL);
kfree(scb);
error:
_leave(" = %d", ret);
