| Message ID | 166126007561.548536.12315282792952269215.stgit@warthog.procyon.org.uk (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | smb3: Fix missing locks and invalidation in fallocate | expand |
lightly updated to move inode lock down one line and fix signed off On Tue, Aug 23, 2022 at 8:24 AM David Howells via samba-technical <samba-technical@lists.samba.org> wrote: > > insert range doesn't discard the affected cached region > so can risk temporarily corrupting file data. > > Also includes some minor cleanup (avoiding rereading > inode size repeatedly unnecessarily) to make it clearer. > > Cc: stable@vger.kernel.org > Fixes: 7fe6fe95b9360 ("cifs: FALLOC_FL_INSERT_RANGE support") > Signed-off-by: David Howells <dhowells@redhat.com> > Signed-off-by: Steve French <stfrench@microsoft.com> > cc: Ronnie Sahlberg <lsahlber@redhat.com> > --- > > fs/cifs/smb2ops.c | 24 ++++++++++++++++-------- > 1 file changed, 16 insertions(+), 8 deletions(-) > > diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c > index 5b5ddc1b4638..00c8d6a715c7 100644 > --- a/fs/cifs/smb2ops.c > +++ b/fs/cifs/smb2ops.c > @@ -3722,35 +3722,43 @@ static long smb3_insert_range(struct file *file, struct cifs_tcon *tcon, > struct cifsFileInfo *cfile = file->private_data; > struct inode *inode = file_inode(file); > __le64 eof; > - __u64 count; > + __u64 count, old_eof; > + > + inode_lock(inode); > > xid = get_xid(); > > - if (off >= i_size_read(inode)) { > + old_eof = i_size_read(inode); > + if (off >= old_eof) { > rc = -EINVAL; > goto out; > } > > - count = i_size_read(inode) - off; > - eof = cpu_to_le64(i_size_read(inode) + len); > + count = old_eof - off; > + eof = cpu_to_le64(old_eof + len); > > + filemap_invalidate_lock(inode->i_mapping); > filemap_write_and_wait(inode->i_mapping); > + truncate_pagecache_range(inode, off, old_eof); > > rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid, > cfile->fid.volatile_fid, cfile->pid, &eof); > if (rc < 0) > - goto out; > + goto out_2; > > rc = smb2_copychunk_range(xid, cfile, cfile, off, count, off + len); > if (rc < 0) > - goto out; > + goto out_2; > > - rc = smb3_zero_range(file, tcon, off, len, 1); > + rc = smb3_zero_data(file, tcon, off, len, xid); > if (rc < 0) > - goto out; > + goto out_2; > > rc = 0; > +out_2: > + filemap_invalidate_unlock(inode->i_mapping); > out: > + inode_unlock(inode); > free_xid(xid); > return rc; > } > > >
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index 5b5ddc1b4638..00c8d6a715c7 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -3722,35 +3722,43 @@ static long smb3_insert_range(struct file *file, struct cifs_tcon *tcon, struct cifsFileInfo *cfile = file->private_data; struct inode *inode = file_inode(file); __le64 eof; - __u64 count; + __u64 count, old_eof; + + inode_lock(inode); xid = get_xid(); - if (off >= i_size_read(inode)) { + old_eof = i_size_read(inode); + if (off >= old_eof) { rc = -EINVAL; goto out; } - count = i_size_read(inode) - off; - eof = cpu_to_le64(i_size_read(inode) + len); + count = old_eof - off; + eof = cpu_to_le64(old_eof + len); + filemap_invalidate_lock(inode->i_mapping); filemap_write_and_wait(inode->i_mapping); + truncate_pagecache_range(inode, off, old_eof); rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid, cfile->fid.volatile_fid, cfile->pid, &eof); if (rc < 0) - goto out; + goto out_2; rc = smb2_copychunk_range(xid, cfile, cfile, off, count, off + len); if (rc < 0) - goto out; + goto out_2; - rc = smb3_zero_range(file, tcon, off, len, 1); + rc = smb3_zero_data(file, tcon, off, len, xid); if (rc < 0) - goto out; + goto out_2; rc = 0; +out_2: + filemap_invalidate_unlock(inode->i_mapping); out: + inode_unlock(inode); free_xid(xid); return rc; }
insert range doesn't discard the affected cached region so can risk temporarily corrupting file data. Also includes some minor cleanup (avoiding rereading inode size repeatedly unnecessarily) to make it clearer. Cc: stable@vger.kernel.org Fixes: 7fe6fe95b9360 ("cifs: FALLOC_FL_INSERT_RANGE support") Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Steve French <stfrench@microsoft.com> cc: Ronnie Sahlberg <lsahlber@redhat.com> --- fs/cifs/smb2ops.c | 24 ++++++++++++++++-------- 1 file changed, 16 insertions(+), 8 deletions(-)