int afs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
struct iattr *attr)
{
+ const unsigned int supported =
+ ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
+ ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET | ATTR_TOUCH;
struct afs_operation *op;
struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
+ struct inode *inode = &vnode->vfs_inode;
+ loff_t i_size;
int ret;
_enter("{%llx:%llu},{n=%pd},%x",
vnode->fid.vid, vnode->fid.vnode, dentry,
attr->ia_valid);
- if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
- ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET |
- ATTR_TOUCH))) {
+ if (!(attr->ia_valid & supported)) {
_leave(" = 0 [unsupported]");
return 0;
}
+ i_size = i_size_read(inode);
if (attr->ia_valid & ATTR_SIZE) {
- if (!S_ISREG(vnode->vfs_inode.i_mode))
+ if (!S_ISREG(inode->i_mode))
return -EISDIR;
- ret = inode_newsize_ok(&vnode->vfs_inode, attr->ia_size);
+ ret = inode_newsize_ok(inode, attr->ia_size);
if (ret)
return ret;
- if (attr->ia_size == i_size_read(&vnode->vfs_inode))
+ if (attr->ia_size == i_size)
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);
-
/* Prevent any new writebacks from starting whilst we do this. */
down_write(&vnode->validate_lock);
+ if ((attr->ia_valid & ATTR_SIZE) && S_ISREG(inode->i_mode)) {
+ loff_t size = attr->ia_size;
+
+ /* Wait for any outstanding writes to the server to complete */
+ loff_t from = min(size, i_size);
+ loff_t to = max(size, i_size);
+ ret = filemap_fdatawait_range(inode->i_mapping, from, to);
+ if (ret < 0)
+ goto out_unlock;
+
+ /* Don't talk to the server if we're just shortening in-memory
+ * writes that haven't gone to the server yet.
+ */
+ if (!(attr->ia_valid & (supported & ~ATTR_SIZE & ~ATTR_MTIME)) &&
+ attr->ia_size < i_size &&
+ attr->ia_size > vnode->status.size) {
+ truncate_pagecache(inode, attr->ia_size);
+ fscache_resize_cookie(afs_vnode_cache(vnode),
+ attr->ia_size);
+ i_size_write(inode, attr->ia_size);
+ ret = 0;
+ goto out_unlock;
+ }
+ }
+
op = afs_alloc_operation(((attr->ia_valid & ATTR_FILE) ?
afs_file_key(attr->ia_file) : NULL),
vnode->volume);