[PATCH 53/67] afs: Invoke fscache_resize_cookie() when handling ATTR_SIZE for setattr

David Howells
2021-10-18T15:05:47Z

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@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
---

fs/afs/inode.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index 311df66c64d0..c4af4fda37dd 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -829,6 +829,9 @@ static void afs_setattr_edit_file(struct afs_operation *op)

if (size < i_size)
truncate_pagecache(inode, size);
+ if (size != i_size)
+ fscache_resize_cookie(afs_vnode_cache(vp->vnode),
+ vp->scb.status.size);
}
}

@@ -872,6 +875,8 @@ int afs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
attr->ia_valid &= ~ATTR_SIZE;
}

+ 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);
@@ -903,6 +908,7 @@ int afs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,

out_unlock:
up_write(&vnode->validate_lock);
+ fscache_unuse_cookie(afs_vnode_cache(vnode), NULL, NULL);
_leave(" = %d", ret);
return ret;
}